Including Dewatering Sludge Patents (Class 210/609)
  • Patent number: 10981116
    Abstract: A process for treating waste water, including the steps of extracting by forward osmosis treated water from a wastewater feed stream and transferring it to a saline draw stream, and extracting from the saline draw stream treated water by a reverse osmosis process.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: April 20, 2021
    Assignee: EnrgiStream Pty Etd
    Inventors: Rowan John Kennedy, James John Tanner, Rhys Lathlain Eddy
  • Patent number: 10730777
    Abstract: Sewage sludge is treated to produce Class A (generally pathogen free) biosolids. Some or all of the sewage sludge is thickened or dewatered to 10 wt % dried solids and then fed to a thermophilic anaerobic digester. The thermophilic digester has multiple stages provided by way of a tank with at least one internal wall. Effluent from the thermophilic digester is treated further in a mesophilic anaerobic digester.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: August 4, 2020
    Assignee: ANAERGIA INC.
    Inventors: Matthew John Kuzma, Juan Carlos Josse
  • Patent number: 10723646
    Abstract: An organic wastewater treatment method that includes a raw sludge removal step, a raw sludge concentration step, a biological treatment step, an excess sludge separation step, an excess sludge concentration step, a sludge mixing step, and a methane fermentation treatment step. The treatment method further includes a sterilization step for heating and sterilizing the concentrated excess sludge upstream of the sludge mixing step. At least one among: (1) the temperature to which the concentrated excess sludge is heated during sterilization, (2) the concentration of concentrated raw sludge and/or the concentration of the concentrated excess sludge, and (3) the mixture ratio between the concentrated raw sludge and the concentrated excess sludge is adjusted according to the fluctuation in the amount of raw sludge generated and the amount of the excess sludge generated, and the temperature of the mixed sludge is controlled to a temperature suited for methane fermentation.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: July 28, 2020
    Assignees: METAWATER CO., LTD., THE UNIVERSITY OF KITAKYUSHU
    Inventors: Hidenari Yasui, Mitsuharu Terashima, Tetsuya Yanase, Natsumi Noiri
  • Patent number: 10611657
    Abstract: The present invention provides a method and system for preparing fuel gas by utilizing an organic waste with high water content. The method comprises the following steps: 1) providing an organic waste with high water content; 2) performing hydrothermal reaction by using the organic waste with high water content as a reactant to obtain a hydrothermal reaction product; 3) enabling the hydrothermal reaction product to generate steam, and separating a solid product and an oily liquid product in the hydrothermal reaction product; 4) performing gasification reaction by using the solid product, the oily liquid product and the steam as reactants to obtain a gasification reaction product; and 5) purifying the gasification reaction product to obtain clean fuel gas. The present invention further provides a system for preparing fuel gas. The method can be used for preparing clean fuel gas from the organic waste with water content of 60% or more.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: April 7, 2020
    Assignee: Tongji University
    Inventors: Xiaohu Dai, Dezhen Chen, Yuyan Hu, Lijie Yin, Xiaobo Ma
  • Patent number: 10421895
    Abstract: In one aspect, a secondary or tertiary hydrocarbon recovery method includes flowing a complex emulsion into a subterranean zone. The complex emulsion includes an internal fluid-in-gas emulsion configured to increase a density and a viscosity of a gas in the internal fluid-in-gas emulsion emulsifying a fluid in the internal fluid-in-gas emulsion. The complex emulsion includes an external fluid emulsifying the internal fluid-in-gas emulsion, and the external fluid is configured to carry corrosion inhibitors into the subterranean zone. The complex emulsion includes hydrophobic particles encapsulating an outer surface of droplets of the fluid in the internal fluid-in-gas emulsion. A concentration of the hydrophobic particles is between about 0.1% and 0.5% by weight.
    Type: Grant
    Filed: June 28, 2018
    Date of Patent: September 24, 2019
    Assignee: Saudi Arabian Oil Company
    Inventors: Fawaz M. Al-Otaibi, Sunil Kokal
  • Patent number: 10188084
    Abstract: Variable-scale, modular, easily manufacturable, energy efficient, reliable, and computer operated Insect Production Superstructure Systems (IPSS) may be used to produce insects for human and animal consumption, and for the extraction and use of lipids for applications involving medicine, nanotechnology, consumer products, and chemical production with minimal water, feedstock, and environmental impact. An IPSS may comprise modules including feedstock mixing, feedstock splitting, insect feeding, insect breeding, insect collection, insect grinding, pathogen removal, multifunctional flour mixing, and lipid extraction. An IPSS may be configured to be constructed out of a plurality of containerized modules.
    Type: Grant
    Filed: August 21, 2016
    Date of Patent: January 29, 2019
    Inventor: Daniel Michael Leo
  • Patent number: 10160680
    Abstract: A process is provided, comprising: (a) supplying ammonium-containing wastewater to a reactor containing granular sludge comprising granules having a core of anammox bacteria and an outer rim of ammonia oxidizing bacteria; (b) subjecting the wastewater to ammonium oxidation at a temperature between 5 to 25° C., a dissolved oxygen concentration between 0.4 mg/L to 4.0 mg/L, and a hydraulic retention time between 0.5 hours to 1.5 days, obtaining a nitrogen gaseous stream and a dispersion of granular and non-sludge in treated wastewater; and (c) separating the dispersion into a granular sludge stream and a stream of treated wastewater and non-granular sludge, and (d) recycling the granular sludge to the reactor while discharging the non-granular sludge, wherein the granular sludge has a reactor retention time at least ten times the hydraulic retention time, and wherein the retention time of non-granular sludge is no more than three times the hydraulic retention time.
    Type: Grant
    Filed: April 3, 2014
    Date of Patent: December 25, 2018
    Assignee: PAQUES I.P. B.V.
    Inventors: Tim Lucas George Hendrickx, Tommaso Lotti, Marinus Cornelis Maria Van Loosdrecht, Jans Kruit
  • Patent number: 9963371
    Abstract: A process for treatment of municipal wastewater plant sludge to the criteria of Class A biosolids. The process uses hydrogen peroxide and thermo-oxidation to reduce volatile suspended solids to meet the criteria. On a batch basis, waste activated sludge is introduced into a reactor; the concentration of the waste activated sludge is adjusted to about 1.5% total suspended solids with secondary effluent, if necessary; the reactor is mixed; the reactor is pre-heated to an operating temperature in a range of about 65° C. to about 90° C.; subsequently, a 50% solution of laboratory grade hydrogen peroxide is introduced into the bottom of the reactor; and the contents are heated for at least 4 hours.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: May 8, 2018
    Assignee: U.S. Environmental Protection Agency
    Inventors: Makram T. Suidan, Richard C. Brenner, Edith L. Holder, Robert J. Grosser
  • Patent number: 9783442
    Abstract: Phagotrophic algae are used in connection with aerobic or anaerobic digestion of solids, especially waste activated sludge (WAS), to more efficiently digest solids and to meet, over a shorter period of time, volatile solids standards and specific oxygen uptake rate requirements as well as pathogen reduction requirements.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: October 10, 2017
    Assignees: Ovivo Inc., The University of Akron
    Inventors: Lu-Kwang Ju, Hiren K. Trivedi
  • Patent number: 9738554
    Abstract: The present invention discloses a composite biogenic flocculant for enhancing flocculation and dewaterability of chemically enhanced primary treatment (CEPT) sludge. The present invention also discloses method of conditioning CEPT sludge using the composite biogenic flocculant.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: August 22, 2017
    Assignee: Hong Kong Baptist University
    Inventor: Jonathan Woon-Chung Wong
  • Patent number: 9403705
    Abstract: In a water treatment method and an apparatus therefor, after an anionic polymer flocculant is added to water to be treated, granulation is performed by stirring, and solid-liquid separation is then performed to obtain treated water, and flocs which are not disintegrated by a shearing force during stirring and have a preferable settling property can be formed, so that the quality of treated water is also improved. Particularly, a water treatment method includes a flocculating step of adding an anionic polymer flocculant to water to be treated to form flocculated flocs, a subsequent granulating step of stirring the water to be treated to granulate the flocculated flocs, and a solid-liquid separation step of performing solid-liquid separation of generated granulated substances, wherein a cationic polymer flocculant having a cationic group rate of 10 to 50 mole % is added to the water to be treated before the anionic polymer flocculant is added.
    Type: Grant
    Filed: September 3, 2013
    Date of Patent: August 2, 2016
    Assignee: KURITA WATER INDUSTRIES LTD.
    Inventors: Satoshi Shimizu, Mitsuharu Terashima
  • Patent number: 9302949
    Abstract: The present invention is a system for processing organic waste using insect larvae, which has the advantage of being able to process large quantities of organic fecal waste material. The system includes a plurality of substantially flat reaction vessels stacked one on top of the other in parallel arrangement to form a processing blocks 11. Each of the reaction vessels in the processing block 11 are dimensioned and configured to contain a quantity of organic waste, each reaction vessel having front and back ends and side edges, the reaction vessels each being separated from the reaction vessel above by an air space 23, the processing block being contained in a plant enclosure having side walls. At least one of the side walls of the plant enclosure (plenum wall 38) is positioned adjacent the processing block such that the plenum wall is adjacent one of the side edges of the reaction vessels.
    Type: Grant
    Filed: May 1, 2008
    Date of Patent: April 5, 2016
    Inventor: Ivan Milin
  • Patent number: 9181120
    Abstract: Low strength wastewater such as municipal sewage is treated using an anaerobic digester. In some examples, a wastewater stream is separated into a solids rich portion and a solids lean portion. The solids lean portion is treated, for example to remove nitrogen. The solids rich portion is treated in an anaerobic digester, preferably with influent or recuperative thickening. In another example, the wastewater stream is fed to an anaerobic digester and solid-liquid separation stages downstream of the digester return active bacteria and undigested organics to the digester. Both cases may use a process train comprising treatment in an anoxic tank followed by a nitritation tank with a portion of the effluent from the nitritation tank recirculated to the anoxic tank to provide nitritation and denitritation.
    Type: Grant
    Filed: August 12, 2011
    Date of Patent: November 10, 2015
    Assignee: ANAERGIA INC.
    Inventors: Juan Carlos Josse, Andrew Benedek, Diana Mourato-Benedek
  • Patent number: 9073106
    Abstract: A process for decontaminating a medium polluted with metals and hydrophobic organic compounds (HOC) includes providing an acidic slurry of water, acid, chloride salt, surfactant, and the polluted medium. Flotation is preformed on the acidic slurry to form a HOC-rich froth and an HOC-depleted slurry and the froth is recovered. The slurry is separated to obtain a treated solid and a liquid effluent rich in metallic ions. Preferably, the process also includes recuperating the metals by chemical precipitation and/or electrodeposition to produce a treated solution. Also provided are a decontaminant having an acid, a chloride salt, and a surfactant as well as a chemical kit for decontaminating the polluted medium including the decontaminant in which the acid, chloride salt and surfactant can be mixed with polluted medium in the presence of water before removing at least a portion of the metals and HOC from the polluted medium.
    Type: Grant
    Filed: October 2, 2008
    Date of Patent: July 7, 2015
    Assignee: INSTITUT NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Guy Mercier, Jean-Francois Blais, Julia Mouton, Patrick Drogui, Myriam Chartier
  • Publication number: 20150144554
    Abstract: In a wastewater treatment system, feed water is processed by anaerobic digestion, preferably in an anaerobic moving bed bioreactor (AnMBBR). Effluent from the AnMBBR passes through one or more solid-liquid separation units. A solids portions is treated by hydrolysis or suspended growth anaerobic digestion. A liquid portion of the hydrolysis or suspended growth anaerobic digestion effluent is returned to the AnMBBR or blended with effluent from the AnMBBR. The AnMBBR effluent may be treated with an aerobic moving bed bioreactor (MBBR) before the one or more solid-liquid separation steps. Membrane filtration may provide a first solid-liquid separation step. A thickened waste stream may be withdrawn from a recirculation loop flowing from the first solid-liquid separation unit to the MBBR. Optionally, a solids portion separated from the feed water upstream of the AnMBBR may also be treated by hydrolysis or suspended growth anaerobic digestion.
    Type: Application
    Filed: May 28, 2013
    Publication date: May 28, 2015
    Inventors: Juan Carlos Josse, Michael David Theodoulou, Sasha Rollings-Scattergood
  • Publication number: 20150076059
    Abstract: Feed water is processed in an anaerobic digester. A solid-liquid separation device, for example a sludge screw thickener, treats a stream drawn from the digester in a recirculation loop. The solids portion is returned to the digester to increase the solids retention time and the TSS concentration in the digester. A liquid portion with less than 5% of the solids in the stream is removed and optionally treated further. The flow rate to the solid-liquid separation device is preferably greater than the influent flow rate. The solid-liquid separation device may receive digestate at a TSS concentration of 4% or more and return a solids portion having a TSS concentration of over 10%. The feed water is preferably one or more industrial waste streams having a COD concentration of 20,000 to 50,000 mg/L and a TSS concentration from 1-5%. The organic loading rate may be 10-12 kg/COD/m3/day.
    Type: Application
    Filed: April 19, 2013
    Publication date: March 19, 2015
    Applicant: ANAERGIA INC.
    Inventors: Michael David Theodoulou, Juan Carlos Josse
  • Publication number: 20150048025
    Abstract: Method for treating iron-contaminated water using a treatment approach identified herein as the Activated Iron Solids (AIS) Process. The AIS process is capable of oxidizing and removing iron as iron oxides from iron-contaminated waters producing a clean effluent. The AIS process is performed in a single or multiple tank system in which high concentrations of AIS are suspended through mechanical mixing to maintain a catalytic surface chemistry environment that increases iron removal thousands times faster than would naturally occur and hundreds times faster than existing arts (e.g., aerobic pond passive treatment). The AIS process can utilize inexpensive alkaline material (such as, pulverized limestone) where initial mine drainage alkalinity (mg/L as CaCO3) to ferrous iron (mg/L) ratio is less than approximately 1.7.
    Type: Application
    Filed: August 19, 2013
    Publication date: February 19, 2015
    Inventor: Jonathan M. Dietz
  • Patent number: 8956539
    Abstract: A system and process for drying biosolids and wherein nutrients and/or minerals are blended into partially dried biosolids. Further, the system and method compresses the mixture of biosolids and nutrients into a selected form and this is followed by completion of the drying process. In the end, a more uniform and higher value dried biosolids product is produced.
    Type: Grant
    Filed: March 9, 2013
    Date of Patent: February 17, 2015
    Assignee: I. Kruger Inc.
    Inventors: Travis Smith, J. Jason Boyd
  • Publication number: 20140371113
    Abstract: A method of processing a return oil-based drilling fluid includes centrifuging a primarily fluids phase at a first speed and separating the primarily fluids phase into a first effluent and a first residual, centrifuging the first effluent at a second speed and separating the first effluent into a second effluent and a second residual, and centrifuging the second effluent at a third speed and separating the second effluent into a third effluent and a third residual. A surfactant, a polymer, combinations of surfactant(s) and polymer(s) and/or a wash water may be added to one or more of the return oil-based drilling fluid, the primarily fluids phase, the primarily solids phase, the first effluent, the second effluent, and the third effluent.
    Type: Application
    Filed: October 1, 2012
    Publication date: December 18, 2014
    Inventors: Gary Fout, Michael Savoy
  • Patent number: 8911628
    Abstract: A method for the biological purification of ammonium-containing wastewater. The wastewater is purified in an aeration tank in which a low oxygen concentration of less than 1.0 mg/l is set so as to first convert, using aerobically oxidizing bacteria, ammonium contained in the wastewater to nitrite and then to convert, using anaerobically oxidizing bacteria, ammonium and nitrite to elemental nitrogen. At least a part of surplus sludge formed in the aeration tank is separated into a heavy sludge phase and a light sludge phase. The light sludge phase is fed as surplus sludge to a sludge digestion. Sludge water that is separated off from the sludge in a sludge dewatering is fed to a deammonifying tank. Nitrogen compounds in the sludge water are converted, by deammonification in the deammonifying tank, to elemental nitrogen. Surplus sludge formed in the deammonifying tank is fed to the aeration tank.
    Type: Grant
    Filed: February 1, 2011
    Date of Patent: December 16, 2014
    Assignee: Demon GmbH
    Inventor: Geert Nyhuis
  • Patent number: 8864993
    Abstract: A process that utilizes ammonium oxidizing bacteria (AOB) and anaerobic ammonium oxidizing (ANAMMOX) bacteria to remove ammonium from a wastewater stream. Sludge separated from the wastewater in a mainstream is processed in a sidestream that includes an anaerobic digester, a dewatering system, and a biofilm reactor. The anaerobic digester produces digested sludge that is dewatered, producing reject water that includes a relatively high ammonium concentration and a relatively low organic carbon concentration and a relatively high temperature. The reject water is treated in a sidestream deammonification biofilm reactor that includes biofilm carriers seeded with AOB and ANAMMOX bacteria that are effective to remove ammonium from the reject water. AOB and ANAMMOX bacteria on the media carriers is utilized to contact the wastewater in the mainstream and to remove ammonium therefrom.
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: October 21, 2014
    Assignee: Veolia Water Solutions & Technologies Support
    Inventors: Hong W. Zhao, Thomas Welander, Magnus Christensson, Romain Lemaire
  • Publication number: 20140251902
    Abstract: A method is described for thermal biological breakdown and dewatering of biomass, which is characterised in that it comprises the following steps: lead the biological residue material (8) from a digesting tank (6) to a dewatering device (9) and dewater the material to typically 15-25% dry matter, lead the dewatered material (10) to a device (12) and carry out a thermal hydrolysis at typically 145-170° C. for typically 10-40 minutes, subject the hydrolysed biomass (14) to a quick pressure reduction that results in a steam explosion in the biomass, dewater the thermally hydrolysed and steam exploded hot biomass (14), at typically 85-105° C.
    Type: Application
    Filed: March 5, 2014
    Publication date: September 11, 2014
    Applicant: Cambi Technology AS
    Inventors: Odd Egil SOLHEIM, Pål Jahre Nilsen
  • Publication number: 20140251901
    Abstract: Apparatus and process is provided for hydrolyzing sludge from water treatment and for conditioning the hydrolyzed sludge for optimal anaerobic digestion. Methods provided include dewatering to produce dewatered sludge, hydrolyzing the dewatered sludge in a steam fed process, preheating the dewatered sludge before hydrolysis with sludge-to-sludge heat transfer, and cooling and diluting the sludge using sludge-to-water heat transfer and water injection, and anaerobically digesting the hydrolyzed sludge. Apparatus provided includes a generally vertically oriented counterflow sludge-to-sludge heat exchanger, a hydrolysis reactor and associated source of steam, sludge-to-water heat exchangers, and a dilution unit. Temperature and pressure sensors are configured to command various variable flow pumps and valves for controlling the process.
    Type: Application
    Filed: March 9, 2013
    Publication date: September 11, 2014
    Inventors: Soeren J. Hojsgaard, Lars Rohold
  • Publication number: 20140251899
    Abstract: The present invention relates to a method for taking liquid anaerobic digestion effluent and increasing the solids content by using the effluent and biomass to further digest both.
    Type: Application
    Filed: March 11, 2013
    Publication date: September 11, 2014
    Inventor: Jason Chia Hsing Shih
  • Patent number: 8828229
    Abstract: The invention is directed to wastewater treatment and wastewater reuse. A distributed biological treatment system for modification of the sewer biofilm through the mechanism of competitive exclusion by strategic dosing with facultative bacteria is illustrated, in conjunction with a novel membrane biological reactor (MBR)/biological breeding reactor (BBR) package plant, a plurality of which are likewise designed for strategic placement throughout the sewer/collection system infrastructure. The inclusion of the MBR/BBR plants at specific locations within the distribution system provide upstream water reclamation, thereby facilitating more efficient operation of the downstream wastewater treatment plant and providing for water reuse at intermediate points within the distribution network, as well as a means for concentrating the facultative bacteria which has been dosed to various points in the system, which can then be re-inoculated to the system.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: September 9, 2014
    Assignee: In-Pipe Technology, Inc.
    Inventors: John Williams, Daniel R. Williamson, Jr., J. Rodney Dickerson, Guy Marchesseault, Robert C. Fischer
  • Publication number: 20140246369
    Abstract: A process and system for treating wastewater is described. The invention degrades sludge produced by treatment of the wastewater to reduce or eliminate the need for sludge dewatering and disposal. The invention also reduces the amount of nutrient additives required to sustain the aerobic wastewater treatment process. In one embodiment the invention includes the steps of (a) providing an aerobic treatment system receiving a supply of the wastewater; (b) treating a supply of the sludge to rupture microbial cells present therein to produce treated sludge having an increased liquid:solid ratio and an increased degradation potential in comparison to untreated sludge; (c) conveying a supply of the treated sludge to the aerobic treatment system; and (d) substantially degrading the supply of treated sludge in the aerobic treatment system. The treated sludge may optionally be subjected to anaerobic digestion prior to delivery to the aerobic treatment system.
    Type: Application
    Filed: March 1, 2013
    Publication date: September 4, 2014
    Applicant: PARADIGM ENVIRONMENTAL TECHNOLOGIES INC.
    Inventors: Robert John Stephenson, Scott Christopher Laliberte, Preston Yee Ming Hoy, Patrick William George Neill
  • Publication number: 20140231345
    Abstract: The invention relates to a method for treating wastewater containing hydrocarbons, in particular hydrocarbons from the group of compounds referred to as BTEX, comprising benzene, toluene, ethylbenzene and xylene aromatic compounds, said wastewater being in particular from the production or conditioning of natural gas, wherein, according to the method, the wastewater is subjected to stripping by the natural gas such that the hydrocarbon pollution is not only removed from the water by means of being transferred to the gas, but also eliminated during the subsequent combustion of the gas. The wastewater to be treated has a soluble BTEX content that is no higher than 1,200 ppm, preferably no higher than 900 ppm, and the weight ratio of the stripping gas to the treated water is less than 10%, the water being discharged from the stripper having a soluble BTEX content that is no higher than 30 ppm.
    Type: Application
    Filed: August 27, 2012
    Publication date: August 21, 2014
    Applicant: ONDEO INDUSTRIAL SOLUTIONS
    Inventors: Cathy Fuchs, Craig Wallis, Benoit Tommy-Martin
  • Patent number: 8801930
    Abstract: The method and apparatus for the solid wastes automatic collection pipeline transportation and comprehensive utilization contemplated to reach a easily dropping, automatically collecting, discharging, transporting of all kinds of the solid wastes, getting the plastic package free renewable waste for recycle. The disclosed method and apparatus comprise going toward and near the multiple waste fluidizing collectors set indoor and outdoor, automatically opening the lid of the collector, putting the wastes into the specified containers according to the requirement of the waste recycle program, respectively fluidizing all kinds of the solid wastes into flowable particle and jam to satisfy the pipeline transportation, the multiple waste fluidizing collector in the invention is designed to receive, deposit the wastes and change the solid waste from solid into liquid, that leads to the solid waste automatic collection, transportation and getting the plastic package free, renewable uniform waste for recycle.
    Type: Grant
    Filed: July 16, 2009
    Date of Patent: August 12, 2014
    Inventor: Zeguo Qiu
  • Publication number: 20140151295
    Abstract: The invention relates to an advanced wastewater treatment apparatus that may include a forward osmosis module, a draw-solution separation device, and an ammonia removal device. The forward osmosis module may be installed after a first settling tank, and may include an inflow-water side where water treated by the first settling tank flows, a separation membrane for allowing the treated water to pass therethrough, and a draw-solution side where the draw solution flows. The draw-solution separation device may separate the draw solution and the water of the draw solution, return the separated draw solution to the draw-solution side of the forward osmosis module, and discharge the separated water to the outside. The ammonia removal device may eliminate the ammonia from the treated water of the forward osmosis module.
    Type: Application
    Filed: January 31, 2013
    Publication date: June 5, 2014
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Lee Seock Heon, Na Yong Hun, Yang Seung Heun
  • Publication number: 20140131272
    Abstract: Feed water is processed in an anaerobic digester. A solid-liquid separation device, for example a sludge screw thickener, treats a stream drawn from the digester in a recirculation loop. The solids portion is returned to the digester to increase the solids retention time and the TSS concentration in the digester. A liquid portion with less than 5% of the solids in the stream is removed and optionally treated further. The flow rate to the solid-liquid separation device is preferably greater than the influent flow rate. The solid-liquid separation device may receive digestate at a TSS concentration of 4% or more and return a solids portion having a TSS concentration of over 10%. The feed water is preferably one or more industrial waste streams having a COD concentration of 20,000 to 50,000 mg/L and a TSS concentration from 1-5%. The organic loading rate may be 10-12 kg/COD/m3/day.
    Type: Application
    Filed: March 15, 2013
    Publication date: May 15, 2014
    Applicant: ANAERGIA INC.
    Inventor: Juan Carlos JOSSE
  • Publication number: 20140116938
    Abstract: A chemical/mechanical sludge dewatering treatment method and apparatus injecting SO2 into wastewater inflow streams and/or conventional process liquid streams containing suspended solids at a pH and dwell time to generate sufficient sulfurous acid with free SO2, sulfites and bisulfites to disinfect and self-agglomerate the suspended solids, acid leach heavy metals contained in and on the suspended solids into solution for subsequent separation, condition the suspended solids for subsequent chemical dewatering shedding water upon separation and drying, and mechanically separating and disposing of any solids from its chemically treated liquid fraction to create a Class A biosolid drying to less than 10% by weight water content.
    Type: Application
    Filed: October 25, 2012
    Publication date: May 1, 2014
    Inventor: Marcus George Theodore
  • Publication number: 20140061126
    Abstract: The present invention relates to filtration of liquids, such as water, containing substances that desirably should be removed from the liquids. The invention relates in particular to a filtration cake, being produced in situ of a cleaning system from substances that desirably should be filtered away. Particular preferred embodiments of the present invention relate to treatment of waste water, where an activated sludge is provided, which sludge contains activated sludge flocs. These flocs are accumulated on a fluid penetrable support structure to form a layer of flocs, which subsequently is compressed to form a filter of desired properties. The invention also relates to adapting waste water—or other liquids containing biodegradable substances—to optimised biodegradation and filtration by deflocculating flocs in an activated sludge during or before a biodegradation step and subsequently promoting re-flocculation prior to filtering or other means of biomass separation.
    Type: Application
    Filed: March 27, 2012
    Publication date: March 6, 2014
    Applicant: GRUNDFOS HOLDING A/S
    Inventors: Dominik Marek Dominiak, Tom Bjerregaard Jæger
  • Publication number: 20140034574
    Abstract: A waste stream is treated by anaerobic digestion. A process is described involves a step of separating solids from digestate, and returning separated solids to a digester. Optionally, there may be a step of solids separation in which larger solids are removed from the digester. A process and apparatus are described for treating waste sludge from a wastewater treatment plant in an anaerobic digester. Feed sludge is thickened or solids are separated from digestate and returned to the digester. Additional co-digestion waste may be added to the digester. The process and apparatus may be used in a retrofit of an existing wastewater treatment plant.
    Type: Application
    Filed: November 22, 2011
    Publication date: February 6, 2014
    Applicant: ANAERGIA INC.
    Inventors: Juan Carlos Josse, Andrew Benedek
  • Patent number: 8641902
    Abstract: The invention relates to a method for wastewater treatment utilizing an anaerobic treatment of primary sludge (PS) in a septic tank (5), and a separate treatment of excess sludge (ÜS). The excess sludge (ÜS) is separated from the primary sludge (PS) before the anaerobic treatment, solubilized in a hydrolysis treatment and liquefied, and subjected to a separate anaerobic treatment independently of the primary sludge (PS).
    Type: Grant
    Filed: March 6, 2009
    Date of Patent: February 4, 2014
    Assignee: P.C.S. Pollution Control Services GmbH
    Inventors: Wolfgang Ewert, Michael Sievers, Hinnerk Bormann
  • Publication number: 20130319937
    Abstract: A modular methane digester facility includes prefabricated portable concrete panels and a flexible membrane roof sealing an interior space of the methane digester. A separator-conveyor dewatering device, integratable into the front end of the methane digester facility, separates a semi-solid liquid manure into a liquid portion and a solid portion. A method of dual-stage methane digestion includes stacking a solid stage in a methane digester and supplying a liquid stage to the top of the solid stage. The liquid stage percolates by gravity through the solid stage, the solid stage acts as a filter for the liquid stage, and the liquid stage acts as a methanogenic buffer for the solid stage. A method of pre-heating a mass of solids in a methane digester to a mesophilic temperature includes supplying oxygen to the mass of solids in the form of ambient air supplied to the methane digester by a reverse-air pump.
    Type: Application
    Filed: May 31, 2012
    Publication date: December 5, 2013
    Inventors: William F. Brinton, JR., Jeffrey H. Bragg
  • Publication number: 20130306553
    Abstract: The invention relates to a method for the treatment of process water which is obtained in a plant for the hydrothermal carbonization of renewable raw materials and organic residual materials by an evaporation of process water, a condensation of the washed process steam, and a biological treatment of the process steam condensate as partial quantity or possibly as total quantity of the amount of waste water discharged from an HTC plant.
    Type: Application
    Filed: January 27, 2012
    Publication date: November 21, 2013
    Applicant: SUNCOAL INDUSTRIES GmbH
    Inventor: Tobias Wittmann
  • Publication number: 20130277302
    Abstract: A treatment system for removing a plurality of pollutants from wastewater includes a removal device for removing a plurality of gross solids from the wastewater, an aeration device for reducing a biochemical oxygen demand (BOD) and a chemical oxygen demand (COD) of the wastewater and a bioreactor containing a bacterial biofilm, said bioreactor including a plurality of cells configured for operation on a predetermined drain fill cycle.
    Type: Application
    Filed: March 14, 2013
    Publication date: October 24, 2013
    Inventors: Klaus Doelle, Steve Giarrusso, David L. Johnson
  • Publication number: 20130264279
    Abstract: A renewable energy microgeneration system is disclosed. The system comprises one or more portable containers that include a plurality of small holding tanks that are configured to perform at least one of pasteurization and thermophilic anaerobic digestion on waste, a large holding tank that is configured to perform mesophilic anaerobic digestion on the waste after at least one of pasteurization and thermophilic anaerobic digestion is performed, and a de-watering unit that is configured to dry what remains of the waste after mesophilic anaerobic digestion is performed. The system further comprises a controller for automatically moving the waste between the plurality of small holding tanks, the large holding tank, and the de-watering unit as required to facilitate mesophilic anaerobic digestion in the large holding tank. Further, the portable containers are configured to be transported to a site and placed in fluid communication with each other at the site.
    Type: Application
    Filed: June 5, 2013
    Publication date: October 10, 2013
    Inventor: Nicolas W. SASSOW
  • Publication number: 20130264280
    Abstract: A process that utilizes ammonium oxidizing bacteria (AOB) and anaerobic ammonium oxidizing (ANAMMOX) bacteria to remove ammonium from a wastewater stream. Sludge separated from the wastewater in a mainstream is processed in a sidestream that includes an anaerobic digester, a dewatering system, and a biofilm reactor. The anaerobic digester produces digested sludge that is dewatered, producing reject water that includes a relatively high ammonium concentration and a relatively low organic carbon concentration and a relatively high temperature. The reject water is treated in a sidestream deammonification biofilm reactor that includes biofilm carriers seeded with AOB and ANAMMOX bacteria that are effective to remove ammonium from the reject water. In order to remove ammonium from the wastewater in the mainstream, the AOB and ANAMMOX bacteria on the media carriers is utilized to contact the wastewater in the mainstream and to remove ammonium therefrom.
    Type: Application
    Filed: April 4, 2012
    Publication date: October 10, 2013
    Applicant: VEOLIA WATER SOLUTIONS & TECHNOLOGIES SUPPORT
    Inventors: Hong W. Zhao, Thomas Welander, Magnus Christensson, Romain Lemaire
  • Publication number: 20130248443
    Abstract: Wastewater, for example flue gas desulphurization blowdown water, containing soluble selenium is treated in a bioreactor. Microorganisms in the reactor reduce the selenium to elemental selenium, which is insoluble. The elemental selenium is discharged from the reactor in waste sludge also comprising biomass and other suspended solids. Non-microbial suspended solids are removed by way of acid dissolution followed by de-watering. The remaining sludge is burned at a temperature below the selenium oxidation temperature to remove biomass while leaving selenium particles behind.
    Type: Application
    Filed: December 17, 2010
    Publication date: September 26, 2013
    Inventors: Jie Guan, Oijia Fu, Hong Zhou, Yan Jin, Weiqing Xu, Jungang Zhang, Yanping Liu, Minggang She
  • Patent number: 8501006
    Abstract: A wastewater treatment system is described. The treatment system can include an aerobic digestion system, an anaerobic digestion system, and a ventilation system.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: August 6, 2013
    Assignee: Presby Patent Trust
    Inventor: David W. Presby
  • Patent number: 8496827
    Abstract: A method of treating a mixture of microorganisms with readily biodegradable carbon compounds (RBCs) in the form of one or more volatile fatty acids (VFAs), by first inducing the mixture microorganisms to release phosphorus and magnesium which is then tapped o as the mixture is thickened, to produce a phosphorus/magnesium-nch liquid and a phosphorus/magnesium-reduced treated mixture This treated mixture is placed in an anaerobic digester where ammonia is formed, but combines very little with phosphorus or magnesium Next the high-ammonia mixture is dewatered to produce an ammonia-rich liquid, which is combined with the phosphorus and magnesium-rich liquid and reacted to form struvite In one preferred embodiment, VFAs are formed in situ via an upstream unified fermentation and thickening (UFAT) process and added to the waste sidestream to strip phosphorus and magnesium found therein In another preferred embodiment a usable struvite product is harvested.
    Type: Grant
    Filed: February 2, 2009
    Date of Patent: July 30, 2013
    Assignee: Clean Water Services
    Inventor: Robert James Baur
  • Publication number: 20130134090
    Abstract: A method enhancing biological digestion of wastewater sludge is provided. The method uses chlorine dioxide to accelerate and improve the efficiency of aerobic or anaerobic digestion.
    Type: Application
    Filed: December 24, 2010
    Publication date: May 30, 2013
    Applicant: BCR ENVIRONMENTAL CORPORATION
    Inventor: Frederick P. Mussari
  • Patent number: 8402672
    Abstract: A method of controlling a spray dryer apparatus having a spray dryer chamber (1), an air inlet (2), an inlet air control system (11) including a fan (13) and an air heater (14), a feed inlet (3), and an exhaust air outlet (4), comprising determining a content (Y) of moisture of inlet air, determining an inlet air temperature set value (Tinlet) in dependence of the inlet air moisture content (Y), determining an inlet air temperature measured value of inlet air between the air heater (14) and the spray dryer chamber (1), and regulating the inlet air temperature in dependence of the inlet air temperature set value and the inlet air temperature measured value, and determining an outlet air temperature of the exhaust air and regulating an inlet air flow rate in dependence of the outlet air temperature.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: March 26, 2013
    Assignee: GEA Process Engineering A/S
    Inventor: Peter Schultz Nielsen
  • Publication number: 20130026760
    Abstract: The present invention relates to a method and apparatus for treating organic waste and producing solid fuel or compost from the treated organic waste.
    Type: Application
    Filed: July 27, 2012
    Publication date: January 31, 2013
    Applicant: NEW & RENEWABLE ENERGY CO., LTD.
    Inventors: Haeng Seog Lee, Eun Min Cho, Han Jun Lee
  • Publication number: 20130015125
    Abstract: The present invention relates to the biological purification of wastewater by means of activated sludge, wherein the wastewater is first introduced into an activated-sludge tank (B tank) that can be ventilated and then is introduced into one of two sedimentation and recirculation tanks (SU tanks) in alternation, the sedimentation and recirculation tanks being continuously connected hydraulically to the B tank. In the sedimentation and recirculation tanks, the activated sludge and the treated water are separated by sedimentation (V phase), and thereafter activated sludge is fed back into the B tank (S phase). Then the contents of the SU tank are mixed (U phase). Finally, the treated water is drawn off (A phase).
    Type: Application
    Filed: January 5, 2011
    Publication date: January 17, 2013
    Inventor: Kurt Ingerle
  • Patent number: 8349184
    Abstract: Sewage sludge is dewatered to a cake-like state. The viscosity of the sludge is lowered by admixing a quantity of urea, urea-ammonium-nitrate, or other nitrogen-containing material, in with the dewatered sludge. The treatment also removes pathogens, and renders the product suitable for use as a fertilizer.
    Type: Grant
    Filed: March 3, 2010
    Date of Patent: January 8, 2013
    Assignee: Lystek International Inc.
    Inventors: Owen P. Ward, Ajay Singh
  • Publication number: 20130001160
    Abstract: A method for the biological purification of ammonium-containing wastewater. The wastewater is purified in an aeration tank in which a low oxygen concentration of less than 1.0 mg/l is set so as to first convert, using aerobically oxidizing bacteria, ammonium contained in the wastewater to nitrite and then to convert, using anaerobically oxidizing bacteria, ammonium and nitrite to elemental nitrogen. At least a part of surplus sludge formed in the aeration tank is separated into a heavy sludge phase and a light sludge phase. The light sludge phase is fed as surplus sludge to a sludge digestion. Sludge water that is separated off from the sludge in a sludge dewatering is fed to a deammonifying tank. Nitrogen compounds in the sludge water are converted, by deammonification in the deammonifying tank, to elemental nitrogen. Surplus sludge formed in the deammonifying tank is fed to the aeration tank.
    Type: Application
    Filed: February 1, 2011
    Publication date: January 3, 2013
    Applicant: CYKLAR-STULZ ABWASSERTECHNIK GMBH
    Inventor: Geert Nyhuis
  • Patent number: 8323495
    Abstract: The disclosure describes a novel method for operating a bioreactor and filtration system. The method adds excess iron to the bioreactor to improve the overall operation and efficiency of the bioreactor/filtration system.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: December 4, 2012
    Assignee: Anticline Disposal, LLC
    Inventor: Lee L. Shafer
  • Publication number: 20120247165
    Abstract: A method of integration of concentration-dehydration and aerobic air-drying of sewage sludge comprises the following steps: (a) conditioning by an organic agent (3); (b) gravitationally concentrating (5) the residual sludge conditioned by the organic agent; (c) conditioning by inorganic agents (7); (d) mechanically dehydrating (8); (e) crushing and dispersing (10); and (t) aerobically air-drying (11).
    Type: Application
    Filed: November 18, 2009
    Publication date: October 4, 2012
    Applicant: Guangzhou Pude Environmental Protection Equipment Ltd.
    Inventors: Huansheng Zhong, Xuewei Wu, Jiacong Wu, Zhimin Sun, Haiying Yang