To Mainstream Oxygenation (e.g., Activated Sludge, Etc.) Patents (Class 210/626)
  • Patent number: 10106445
    Abstract: An aerobic treatment/clarifying system for use in an aerobic wastewater treatment system. The system comprises a structure which defines at least one compartment, at least one aerobic treatment chamber and at least two clarifying chambers being formed in the compartment.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: October 23, 2018
    Inventor: Jerry L. McKinney
  • Patent number: 9393266
    Abstract: Bags and/or dark circles around the eyes of individuals afflicted therewith are reduced by administering to such individuals thus effective amounts of at least one extract of a non-photosynthetic and non-fruiting filamentous bacterium cultured in a medium which includes at least one non-sulfurous mineral and/or thermal water, e.g., an extract derived from the bacterium Vitreoscilla filiformis, in particular the strain ATCC 15551, cultured in a medium enriched with water from La Roche Posay.
    Type: Grant
    Filed: July 17, 2008
    Date of Patent: July 19, 2016
    Assignee: L'Oreal
    Inventors: Lionel Breton, Audrey Gueniche
  • Patent number: 8980091
    Abstract: A method and system for controlling dissolved oxygen levels in a secondary treatment system of a wastewater treatment facility that can employ a membrane bioreactor in which oxygen introduction into mixed liquor is controlled to prevent bulking and minimize generation of extra cellular polymeric substances. The control is exercised by insuring that dissolved oxygen levels within the mixed liquor do not fall below a minimum system level at which microorganism stress would occur. This is done by setting a minimum dissolved oxygen level control point equal to a sum of the minimum system level and an adjustment factor determined on the basis of oxygen uptake rate and time delays inherent in sensing oxygen levels and changes thereof within the mixed liquor. The minimum system dissolved oxygen level can be continually calculated on the basis of an inferred food to mass ratio that would vary with sensed mixed liquor suspended solids.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: March 17, 2015
    Assignee: Praxair Technology, Inc.
    Inventor: Malcolm E. Fabiyi
  • Publication number: 20140305868
    Abstract: A process of stabilizing activated sludge wastewater treatment using chitosan includes the following steps. Firstly, an activated sludge wastewater treatment system is provided. The activated sludge treatment system includes an aeration tank, a settlement tank, a sludge recycling device and a sludge exhausting device. The aeration tank receives mixed liquor and is connected to the settlement tank. The settlement tank outputs clean water. Secondly, chitosan is provided in the form of cationic polyelectrolyte. Finally, chitosan is added to the activated sludge treatment system by a dispenser.
    Type: Application
    Filed: January 3, 2014
    Publication date: October 16, 2014
    Inventor: YA-CHUNG WEI
  • Publication number: 20140305867
    Abstract: A method and installation for treating wastewater containing ammonia includes feeding activated sludge from an aeration tank into a hydrocyclone. The sludge is separated into a specifically heavy fraction containing mostly anaerobic ammonia-oxidizing bacteria (anammox) and a specifically light fraction containing mostly aerobic oxidizing bacteria (AOB), which are returned to the aeration tank. The hydrocyclone includes a roughened inner wall surface for at least partially removing an organic or inorganic cover layer disposed on the anaerobic ammonium-oxidizing bacteria (anammox).
    Type: Application
    Filed: November 21, 2013
    Publication date: October 16, 2014
    Applicant: cyklar-stulz GmbH
    Inventor: Geert Nyhuis
  • Patent number: 8835159
    Abstract: A static solid state bioreactor and method of using same. The bioreactor comprises a vessel having an upper end and a lower end, the upper end having a sealable opening. A gas distribution system in communication with the upper end and the lower end of the vessel. A liquid distribution system in communication with the upper end of the vessel. A liquid recovery system in communication with the lower end of the vessel. A material removal system disposed at the lower end of the vessel for removing biomass from the vessel.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: September 16, 2014
    Assignee: Geosynfuels, LLC
    Inventors: Jeffrey T. Harvey, Murray D. Bath, Glenn R. Sprenger, Edward Ogrodny
  • 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: 20140217019
    Abstract: The invention is directed to systems and methods of biological and chemical treatment of wastewater comprising organic nitrogen compounds. Systems may include: an aerobic reactor, a first separation module for separating liquid and solid components of the wastewater; an oxidation module for removing organic materials from the wastewater; and a post-anoxic reactor for denitrifying at least a portion of the wastewater. Systems may include a second separation module and various feedback recycle lines between the components. Methods may include: degrading by the aerobic reactor more than 95% of organic compounds to ammonia, oxidizing by the oxidation module at least a portion of the ammonia to nitrates, and degrading by the post-anoxic reactor at least a portion of the nitrates to nitrogen gas and water. Systems and methods may reduce total organic carbon of the wastewater by more than 90%, and total nitrogen of the wastewater by more than 90%.
    Type: Application
    Filed: February 1, 2013
    Publication date: August 7, 2014
    Applicant: Infilco Degremont, Inc.
    Inventors: SUNIL MEHTA, NABIN CHOWDHURY, RICHARD UBALDI, BARBARA SCHILLING, ANTONIO LAU, BRUNO HEINIGER
  • Publication number: 20140158614
    Abstract: Described herein are methods and devices for biologically treating water and/or wastewater. The methods and devices for treating wastewater may be enhanced using an surge lifting device which moves water and/or solids using volumes of air (for liquid transfer and mixing) and the automatic sludge return mechanism, combined with alternating aeration on and off operation to achieve comprehensive nitrogen and phosphorus removal. This surge lifting device can provide occasional surges of water using large bubbles which are able to move great volume of liquid while minimizing dissolved oxygen transfer to the surrounding liquid. Use of the devices and processes herein provides a simple, eloquent approach to wastewater treatment with less operation and maintenance costs than conventional devices and/or processes. The same surge lifting device can also be installed in an anaerobic digester, and use the biogas generated below the device to automatically mix the digester, without external energy input.
    Type: Application
    Filed: May 10, 2013
    Publication date: June 12, 2014
    Inventor: Jianmin Wang
  • Patent number: 8685235
    Abstract: An integrated sewage biochemical treatment plant containing mechanical treatment devices, a sewage-and-sludge mixing chamber with a circulation pump and a combined biological treatment device, includes a plane feed biofilter, a spray line, collecting trays and drain collectors connected to water-jet aeratic columns sunk in the aeration zones, and aftertreatment devices. The combined biological treatment device whose capacity is 5 to 15,000 m3/day has a biofilters spray line that includes trays with emptying fittings and reflecting disks, the distance from the trays emptying fittings upper ends to the disk reflectors is 0.8 to 2 m, and the distance between the trays centers and the distance between the trays fittings axes is 0.6 to 1.8 m.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: April 1, 2014
    Inventor: Vladimir Petrovich Kolesnikov
  • Publication number: 20140083936
    Abstract: An apparatus and method for selecting, retaining or bioaugmenting solids in an activated sludge process for improving wastewater treatment using screens. The screens can be used to separate and retain solids based on size, compressibility or shear resistance. The screens are used to separate and select slow growing organisms, faster settling organisms, or materials added to absorb, treat or remove constituents in the activated sludge process. A swapping screen arrangement provides another means of selecting various particles. The exposed shear rate or time, particle compression, or SRTs can be adjusted manually and/or automatically in response to detected readings from an instrument such as a spectrophotometer or other optical approaches to optimize selection of organisms.
    Type: Application
    Filed: September 20, 2013
    Publication date: March 27, 2014
    Applicant: D.C. Water & Sewer Authority
    Inventors: Sudhir N. Murthy, Eugenio Giraldo, Norman D. Dockett, Haydee De Clippeleir, Bernhard Wett, Walter F. Bailey, JR.
  • Publication number: 20130327709
    Abstract: The present invention describes a method of optimizing CO2 concentration to increase the specific growth rate of Anammox bacteria and methanogens in wastewater and sludge treatment, as well as novel systems and methods of treating wastewater and sludge. The specific growth rate or doubling time of the Anammox bacteria and methanogens were determined to be sensitive to dissolved CO2 concentration. Optimizing dissolved CO2 concentration increases the specific growth rate of the Anammox bacteria, which may be used as an alternative biological nitrogen removal process for the treatment of domestic wastewater. In the method and system of treating sludge, the CO2 stripper returns biogas with low CO2 concentration to the headspace of an anaerobic digester in order to lower the headspace CO2 concentration and therefore, the soluble CO2 concentration. The lower soluble CO2 concentration increases the specific growth rate of the methanogens for a more efficient anaerobic digestion process.
    Type: Application
    Filed: August 12, 2013
    Publication date: December 12, 2013
    Applicant: UNIVERSITY OF SOUTH FLORIDA
    Inventor: Peter George Stroot
  • Patent number: 8535534
    Abstract: Fluorescence in situ hybridizations were used to identify and determine the abundance of nitrifying bacteria and Anammox bacteria (recycling bacteria) in freshly settled sludge of biological nutrient removal (BNR) secondary clarifiers. An uneven distribution was observed for recycling bacteria in two BNR systems. Settling patterns suggest microcolony formation processes are sensitive to the internal recycle rate, which allow for rapid recycling bacteria microcolony growth by increasing circulation of flocs through the aeration and anoxic basins. Sludge containing high levels of recycling bacteria are selectively collected and separated from the remaining sludge, uncoupling the solids retention time (SRT) of the recycling bacteria from the wasting bacteria. Elevated recycling bacteria SRTs increase concentrations of nitrifying bacteria in the aeration basin and Anammox bacteria in the anoxic basin, improving nitrification and anaerobic ammonium oxidation.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: September 17, 2013
    Assignee: University of South Florida
    Inventor: Peter G. Stroot
  • Publication number: 20130199997
    Abstract: A method of biologically treating wastewater and removing contaminants from the wastewater is disclosed. In the course of treating the wastewater, biomass is produced. In addition to removing contaminants from the wastewater, the process or method of the present invention entails enhancing the PHA accumulation potential of the biomass. Disclosed are a number of processes that are employed in a biological wastewater treatment system for enhancing PHA accumulation potential. For example, enhanced PHA accumulation potential is realized by exposing the biomass to feast and famine conditions and, after exposing the biomass to famine conditions, stimulating the biomass into a period of feast by exposing the biomass to feast conditions for a selected period of time by applying an average peak stimulating RBCOD feeding rate of greater than 5 mg-COD\L\MIN in combination with an average peak specific RBCOD feeding rate greater than 0.5 mg-COD\g-VSS\MIN.
    Type: Application
    Filed: August 17, 2011
    Publication date: August 8, 2013
    Applicant: VEOLIA WATER SOLUTIONS & TECHNOLOGIES SUPPORT
    Inventors: Alan Gideon Werker, Simon Olof Harald Bengtsson, Elise Marie Blanchet, Maria das Dores Tavares Gurgo e Cirne, Carl Anton Börje Karlsson, Fernando Morgan-Sagastume
  • Publication number: 20130001159
    Abstract: Method for treating wastewater, in particular municipal wastewater, in which the wastewater is initially received in an equalization basin reactor for performing an infiltration and inflow equalization process. The equalization basin reactor has sufficient capacity for the increased inflow of wastewater received under wet weather conditions. However, the increased inflow is not merely stored in the equalization basin reactor for later processing, but the wastewater treatment process continues throughout the wet weather period with the first stage wastewater treatment being performed in the equalization basin reactor, which further provides a substantially constant outflow of partially treated wastewater for subsequent treatment stages.
    Type: Application
    Filed: June 30, 2011
    Publication date: January 3, 2013
    Inventor: John H. Reid
  • Patent number: 8323499
    Abstract: Biologically treated wastewater is directed as mixed liquor from a treatment tank to a downstream filtration tank having a having a submerged membrane module extending across the cross-sectional area of the filtration tank. Mixed liquor is directed from the bottom of the filtration tank upwardly into the membrane module such that substantially all of the mixed liquor received in the bottom of the filtration tank flows through the membrane module. A permeate stream is produced. A portion of a non-permeate stream is recirculated to the treatment tank. The filtration tank is sized such that there is no substantial recycle of mixed liquor in the filtration tank. Once the mixed liquor in the filtration tank makes one pass through the membrane module the mixed liquor is recycled to the treatment tank and generally not permitted to be recycled through the membrane module without first returning to the treatment tank.
    Type: Grant
    Filed: April 12, 2010
    Date of Patent: December 4, 2012
    Assignee: Veolia Water Solutions & Technologies Support
    Inventors: Hong W. Zhao, Martin Brockmann, Heribert Moeslang, Pierre Girodet
  • Publication number: 20120261337
    Abstract: The present invention is directed to a system and method which recycles waste so that the effluent coming out of the system actually equals a potable water standard with essentially no contaminated sludge. In one embodiment, the solids in wastewater are subjected to aeration and enzymes in a digester for a period of time. The cleanest portion of the water from the digester is then clarified. Sludge, as well as scum, from the clarifier is vacuumed back to the digester. Clear water from the clarifier is delivered to a Recycling stage for filtering to remove suspended solids down to 5-microns. When the recycling process housing reaches saturation, a back-flushing process with clean water sends all of the captured suspended solids back into the Digester.
    Type: Application
    Filed: April 14, 2011
    Publication date: October 18, 2012
    Applicant: Global Water Group, Incorporated
    Inventor: Alan M. Weiss
  • Publication number: 20120234751
    Abstract: A pretreatment method is provided, which comprises the following steps: (1) wastewater feed is introduced into a first end of a first aeration basin, and is mixed with a first concentrated mixed liquor to obtain a first mixed liquor; (2) the first mixed liquor is aerated in the aeration stage of the first aeration basin to obtain a second mixed liquor at a second end of the first aeration basin; (3) the second mixed liquor is introduced into a first sedimentation basin to obtain a supernatant and the first concentrated mixed liquor; (4) the supernatant is discharged and at least a part of the first concentrated mixed liquor is returned to the first end of the first aeration basin. At the same time, a sewage treatment method using the wastewater pretreatment method is provided. The pretreatment method can be used steadily for a long time without discharging sludge.
    Type: Application
    Filed: December 1, 2010
    Publication date: September 20, 2012
    Inventors: Jinmin Li, Liankui Zhou, Dayong Li
  • Publication number: 20120228217
    Abstract: The present invention provides a method for sludge treatment, comprising the following steps: (1) mixing a sludge feed from a sewage biotreatment process with a first mixed liquor to obtain a second mixed liquor; (2) subjecting the second mixed liquor to an oxygen-supplying process to obtain a third mixed liquor; (3) subjecting the third mixed liquor to an anoxic process to obtain a fourth mixed liquor; (4) separating the fourth mixed liquor to obtain a supernatant liquid and a first concentrated mixed liquor; (5) discharging the supernatant liquid, and returning at least a part of the first concentrated mixed liquor as the first mixed liquor to the step (1), wherein the amount of sludge of the first concentrated mixed liquor that does not return to the step (1) is less than the amount of sludge of the sludge feed. The present invention further relates to the use of the method for sludge treatment in sewage treatment. The method for sludge treatment can achieve a long term stable run without sludge discharge.
    Type: Application
    Filed: May 28, 2010
    Publication date: September 13, 2012
    Inventors: Jinmin Li, Liankui Zhou, Dayong Li
  • Patent number: 8197690
    Abstract: A biological wastewater is mixed in an activated sludge tank with activated sludge that is concentrated in the activated sludge tank to a predetermined value. The mixture of wastewater and activated sludge running off in a drain of the activated sludge tank is then sieved to effect an incomplete solid/liquid separation that leaves a separated solid phase in the activated sludge tank. The liquid phase including a remnant of solids is then removed from the tank.
    Type: Grant
    Filed: July 20, 2007
    Date of Patent: June 12, 2012
    Assignee: Universitaet Kassel
    Inventors: Franz-Bernd Frechen, Wernfried Schier
  • Patent number: 8101082
    Abstract: A method for treating waste-activated sludge comprises adding (1) a pozzolanic material to waste-activated sludge to form a mixture. The mixture is homogenized and aerated (2). The pozzolanic material reacts with the waste-activated sludge. The mixture is allowed to settle (3). A portion of the mixture is recirculated (4) from a downstream location to an upstream location. The recycled mixture includes pozzolanic material. Some embodiments provide advantages over existing wastewater treatment methods which may include: reduction or elimination of unpleasant odours, reduction of overall costs, conversion of waste into useful products, and/or reduction or elimination of discharged bacteria or other undesirable materials.
    Type: Grant
    Filed: May 11, 2007
    Date of Patent: January 24, 2012
    Assignee: Pierway Envromental Inc.
    Inventor: Gerd Peter Waschke
  • Patent number: 8057673
    Abstract: Treatment system for wastewater containing ammonium is provided. The treatment system of the present invention includes an ammonia oxidation reactor and a membrane reactor disposed on the back of the ammonia oxidation reactor. The ammonia oxidation reactor includes biological carriers for carrying the ammonium oxidation bacteria and nitrite oxidation bacteria, a pH level controller for increasing the pH level to above 7.5, and a DO (dissolved oxygen) controller for reducing the DO content to less than 1.0 mg/L. The membrane reactor composed of a membrane and an aerator is used to separate the solids and liquids of the effluent of the ammonia oxidation reactor. In addition, a method for treating wastewater containing ammonium is also provided.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: November 15, 2011
    Assignee: Industrial Technology Research Institute
    Inventors: Kuan-Foo Chang, Sheng-Hsin Chang, Shwu-Huey Perng
  • Publication number: 20110198283
    Abstract: A method of cleaning a membrane surface immersed in a liquid medium with a fluid flow, including the steps of providing a randomly generated intermittent or pulsed fluid flow along the membrane surface to dislodge fouling materials therefrom. A membrane module is also disclosed comprising a plurality of porous membranes (6) or a set of membrane modules (5) and a device (11) for providing a generally randomly generated, pulsed fluid flow such that, in use, said fluid flow moves past the surfaces of said membranes (6) to dislodge fouling materials therefrom.
    Type: Application
    Filed: May 29, 2008
    Publication date: August 18, 2011
    Inventors: Fufang Zha, Gerin James, Joseph Edward Zuback, Peter Zauner, Roger William Phelps
  • Publication number: 20110198284
    Abstract: A method for treating wastewater containing ammonium in a de-ammonifying activated-sludge system includes converting a portion of the ammonium into nitrite using aerobically oxidizing bacteria and converting another portion of the ammonium and the nitrite into elementary nitrogen using anaerobically oxidizing bacteria so as to generate a surplus sludge. The surplus sludge is removed from the waste water and separated into a heavy phase including primarily anaerobic ammonium-oxidizing bacteria and a light phase. The heavy phase is collected and/or returned to the system.
    Type: Application
    Filed: August 7, 2009
    Publication date: August 18, 2011
    Applicant: CYKLAR-STULZ ABWASSERTECHNIK GMBH
    Inventor: Geert Nyhuis
  • Patent number: 7993522
    Abstract: Wastewaters are treated by an activated sludge process that includes combining wastewater with bacteria-laden sludge in an activated sludge tank to form a mixed liquor, separating the mixed liquor into a clear effluent and activated sludge stream, pretreating at least a portion of the activated sludge stream in a conditioning tank, transferring at least a portion of the activated sludge stream in the conditioning tank to an interchange bioreactor operating in batch or continuous flow mode, processing the activated sludge stream within the interchange bioreactor by selecting desired growth conditions to cultivate at least one type of bacteria in the activated sludge stream, and returning at least a portion of the activated sludge stream in the bioreactor to the activated sludge tank. The process may further include a sidestream reactor to remove phosphates from the activated sludge stream leaving the interchange bioreactor.
    Type: Grant
    Filed: January 24, 2007
    Date of Patent: August 9, 2011
    Assignee: Siemens Industry, Inc.
    Inventors: Betty-Ann Curtis, Thomas Kutcher, Marc E. Roehl
  • Publication number: 20110180475
    Abstract: The present invention relates to a process for treating wastewater. The process includes the steps of (a) mixing different constituents of said wastewater inside a container, (b) withdrawing said wastewater from container, (c) feeding said wastewater to a bioreactor, (d) contacting said wastewater with an isolated microorganism or an isolated microorganism consortium, (e) aerating a suspension of said wastewater with said isolated microorganism or said isolated microorganism consortium, (f) withdrawing said suspension of said wastewater with said isolated microorganism or said isolated microorganism consortium from said bioreactor, (g) filtering receiving flow from step (f) to separate a concentrate stream from a permeate stream, (h) returning said concentrate stream to said bioreactor and (i) removing permeate stream.
    Type: Application
    Filed: July 15, 2008
    Publication date: July 28, 2011
    Inventors: Fakhrul-Razi Ahmadun, Alireza Pendashteh
  • Publication number: 20110139714
    Abstract: The present invention pertains to a process for reducing the bulking sludge in an activated sludge plant for wastewater treatment wherein an iron(ll) or iron(lll) salt and at least one fatty amine or fatty amine derivative are used, and to compositions comprising the iron(ll) or iron(lll) salt and one or more fatty amines and/or fatty amine derivatives.
    Type: Application
    Filed: June 2, 2009
    Publication date: June 16, 2011
    Applicant: AKZO NOBEL N.V.
    Inventors: Roy Geerts, Cornelis Gijsbertus Van Ginkel, Boen Ho O, Marianne Frederika Reedijk, Benno Middelhuis
  • Publication number: 20110132836
    Abstract: The present invention relates to systems and processes of wastewater treatment and, in particular, to systems and methods of treating wastewater utilizing biological treatments utilizing two mixed liquor recycle streams for nutrient removal.
    Type: Application
    Filed: December 2, 2010
    Publication date: June 9, 2011
    Inventor: John Edward Olson
  • Publication number: 20110089108
    Abstract: An aeration and filtration system and process for treating wastewater is described, the system having an ejector able to mix gas and liquid, an oxidation tank able to contain a solution of wastewater and biological sludge, a filtration means, a pipe able to convey the wastewater and biological sludge solution from the oxidation tank to the filtration means. The pipe is connected to the ejector so as to introduce a turbulence inside the pipe; moreover the filtration means is equipped with a membrane which has micropores.
    Type: Application
    Filed: June 24, 2009
    Publication date: April 21, 2011
    Applicant: MAZZEI INJECTOR COMPANY, LLC
    Inventor: Max Zigerlig
  • Patent number: 7922907
    Abstract: A method for removing contaminant from feedwater by forming a dispersion comprising bubbles of a treatment gas in a continuous phase comprising feedwater, wherein the bubbles have a mean diameter of less than about 5 ?m and wherein the treatment gas is selected from the group consisting of air, oxygen, and chlorine. A method for removing contaminants from a feedwater by subjecting a fluid mixture comprising feedwater and a treatment gas to a shear rate greater than 20,000 s?1 in a high shear device to produce a dispersion of treatment gas in a continuous phase of the feedwater. A system for treating feedwater to remove contaminants therefrom is also presented, the system comprising at least one high shear mixing device comprising at least one generator comprising a rotor and a stator separated by a shear gap; and a pump configured for delivering feedwater and treatment gas to the high shear mixing device.
    Type: Grant
    Filed: February 22, 2010
    Date of Patent: April 12, 2011
    Inventors: Abbas Hassan, Ebrahim Bagherzadeh, Rayford G. Anthony, Aziz Hassan, Gregory G. Borsinger
  • Patent number: 7879237
    Abstract: A biological treatment method and device for organic wastewater, whereby the amount of minute organisms which reduce the amount of excess sludge and held within an activated sludge tank can be stabilized so that the treatment can be stabilized, are provided. Substrates for growing dispersed bacteria and/or dispersed bacteria are supplied to a sludge treatment tank 51 which reduces the sludge by the minute organisms, so that the minute organisms grow stably and reduce the sludge. Specifically, a first and a second biological treatment step are conducted respectively in a first activated sludge tank 21 and a second biological treatment tank 31. The sludge included in effluent which flows from the biological steps is separated in a sedimentation tank 41. The generated sludge obtained is supplied to the sludge treatment tank 51.
    Type: Grant
    Filed: April 7, 2006
    Date of Patent: February 1, 2011
    Assignee: Kurita Water Industries Ltd.
    Inventor: Shigeki Fujishima
  • Patent number: 7875179
    Abstract: The invention provides a side stream type membrane bioreactor process which does not cause an excessive fall in the MLSS concentration in a bioreactor, does not require any additional effluent treatment facility for discharging backwash effluent, and can further ensure the stability of the membrane filtration performance of a separation membrane. According to the invention, in a side stream type membrane bioreactor process, a backwash effluent containing foulants that are generated by backwashing a separation membrane is collected in a backwash effluent tank, and subjected to ozone treatment, and the resultant is returned to a bioreactor. By this ozone treatment, the foulants close to the membrane pore size of the separation membrane are made fine or are made into a state be easily taken into activated sludge flocs. Therefore, even when the treated effluent is returned to the bioreactor, the membrane filtration performance of the separation membrane is not deteriorated.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: January 25, 2011
    Assignee: Metawater Co., Ltd.
    Inventors: Shigehiro Suzuki, Motoharu Noguchi, Koichiro Kando
  • Publication number: 20100264083
    Abstract: In an activated sludge process for treating wastewater, waste activated sludge is directed to a digester and subjected to sequential aerobic, anoxic and anaerobic treatment. Internal recycling of sludge may be carried out. The oxidation reduction potential during the anoxic and anaerobic cycles is carefully managed so that there is a significant reduction in the quantity of sludge that must be disposed of.
    Type: Application
    Filed: April 21, 2009
    Publication date: October 21, 2010
    Inventor: Mark G. Biesinger
  • Publication number: 20100243558
    Abstract: A method of suspending bio-solids in an activated sludge during wastewater treatment in an activated sludge system is provided. In one example embodiment, the method may include treating the activated sludge under anaerobic conditions and flowing the activated sludge through an open channel into a separation vessel. The bio-solids are suspended in the activated sludge by either intermittent agitation comprising an agitation interval and a rest interval or by upright flow of an influent and/or activated sludge. Diffusion of gas, mechanical devices, flow of an influent, and flow of the activated sludge can be utilized to agitate the bio-solids.
    Type: Application
    Filed: March 25, 2009
    Publication date: September 30, 2010
    Inventor: ALEXANDER EKSTER
  • Patent number: 7790032
    Abstract: Waste treatment systems and methods of using them to treat septage, domestic sludge or both are disclosed. Certain examples provided herein relate to waste treatment systems that include a plurality of stages, such as, for example, a plurality of ecosystems, configured to treat domestic sludge, septage or both.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: September 7, 2010
    Assignee: Bioregen Systems LLC
    Inventor: Michael H. Ogden
  • Publication number: 20100213123
    Abstract: A ballasted sequencing batch reactor system for treating wastewater including one or more sequencing batch reactors. A weighting agent impregnation subsystem is configured to mix biological flocs and weighting agent to form weighted biological flocs. A weighting agent recovery subsystem is configured to recover weighting agent from the weighted biological flocs and reintroduce the recovered weighting agent to the weighting agent impregnation subsystem.
    Type: Application
    Filed: April 27, 2010
    Publication date: August 26, 2010
    Inventors: Peter G. Marston, Steven Woodard, Ionel Wechsler
  • Publication number: 20100133179
    Abstract: Treatment system for wastewater containing ammonium is provided. The treatment system of the present invention includes an ammonia oxidation reactor and a membrane reactor disposed on the back of the ammonia oxidation reactor. The ammonia oxidation reactor includes biological carriers for carrying the ammonium oxidation bacteria and nitrite oxidation bacteria, a pH level controller for increasing the pH level to above 7.5, and a DO (dissolved oxygen) controller for reducing the DO content to less than 1.0 mg/L. The membrane reactor composed of a membrane and an aerator is used to separate the solids and liquids of the effluent of the ammonia oxidation reactor. In addition, a method for treating wastewater containing ammonium is also provided.
    Type: Application
    Filed: May 28, 2009
    Publication date: June 3, 2010
    Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Kuan-Foo Chang, Sheng-Hsin Chang, Shwu-Huey Perng
  • Patent number: 7727397
    Abstract: A wastewater treatment apparatus having a fixed film media apparatus having insertable high surface area polymer cartridges providing growth surfaces for autotrophic or heterotrophic bacteria and a protective shielding surface which isolates the biofilm from turbulence within the wastewater treatment system. A method of placement of said media apparatus within the aeration and/or clarifier section of the wastewater treatment apparatus.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: June 1, 2010
    Assignee: Cromaglass Corporation
    Inventors: Michael Gerardi, Henry Holcomb, Gene Wagner
  • Patent number: 7699986
    Abstract: An activated sludge wastewater treatment method is provided. The disclosed method includes: receiving a stream of wastewater into a mixed liquor in an uncovered activated sludge basin; introducing high purity oxygen to the mixed liquor in the activated sludge basin to produce euoxic conditions (i.e. a dissolved oxygen level in the range of between about 5 mg to 15 mg) in the activated sludge basin; passing a portion of the mixed liquor in the activated sludge basin through a clarifier to separate activated sludge and produce an effluent stream and an activated sludge stream; and recycling a portion of the activated sludge stream to the activated sludge basin to produce a mixed liquor having a solids loading of between about 3000 mg and about 10000 mg of suspended solids per liter of mixed liquor and a solids retention time of between about 7 days and 40 days.
    Type: Grant
    Filed: May 9, 2008
    Date of Patent: April 20, 2010
    Assignee: Praxair Technology, Inc.
    Inventors: Richard A. Novak, Malcolm Fabiyi, Amitabh Gupta
  • Publication number: 20100044305
    Abstract: Wastewater treatment system and process in which the influent is passed through a mixing chamber and then through a series of filters of progressively smaller size to separate the materials carrying the colonized bacteria from finer solids in the influent and separate the materials according to size. The materials from the filters are progressively reduced to a smaller size, the materials of smaller size are returned to the mixing chamber, and new influent is inoculated with the colonized bacteria carried by the materials returned to the mixing chamber.
    Type: Application
    Filed: August 19, 2008
    Publication date: February 25, 2010
    Inventor: Herman P. Miller, III
  • Patent number: 7651615
    Abstract: The present disclosure is generally directed to a process for decreasing waste material. The process includes loading organic material into a vessel, supplying ozone and water into the vessel, separating the organic material into solid material and liquid material, and reconditioning water from the liquid material for use again. The ozone oxidizes and breaks down at least a portion of the organic material.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: January 26, 2010
    Assignee: Clemson University Research Foundation
    Inventor: Annel Kay Greene
  • Patent number: 7641798
    Abstract: A waster water treatment apparatus has micro-nano bubbles generation tanks, mixing tanks, a submerged membrane tank, a contact oxidation tank, and an activated charcoal adsorption device. In the micro-nano bubbles generation tanks, micro-nano bubbles are added to the waste water. In the mixing tanks, the waste water containing micro-nano bubbles is mixed with sludge containing microorganisms. In the contact oxidation tank, the waste water containing organofluoric compounds is microbially treated by the micro-nano bubbles added to the waste water. The micro-nano bubbles activate microorganisms in the waste water. Thereby organofluoric compounds are microbially decomposed with effect.
    Type: Grant
    Filed: September 21, 2006
    Date of Patent: January 5, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kazuyuki Yamasaki, Kazuyuki Sakata, Kazumi Chuhjoh
  • Patent number: 7625490
    Abstract: A nitrification-denitrification process using magnetic seeding and magnetic separation to treat water is provided. The process includes biologically converting ammonia to nitrates with a biofilm disposed on magnetic seed. Suspended solids are removed by mixing flocculant and magnetic seeds with the water and magnetically removing floc formed floc from the water.
    Type: Grant
    Filed: September 27, 2007
    Date of Patent: December 1, 2009
    Inventor: Steven L. Cort
  • Publication number: 20090250395
    Abstract: Wastewater treatment systems are disclosed with improved aeration tanks. The improved aeration tank includes an inverted frusto-conical clarifier and a submersible aerator pump disposed between the bottom of the aeration tank and the interior of the clarifier. The aerator pump is connected to an air inlet line that can pass downward through the clarifier and a plurality of bubble outlet lines that extend outward from the pump both radially and tangentially towards the sidewall of the aeration tank. As a result, bubbles rise upward through the aeration space disposed outside of the clarifier and around the aeration space or around the clarifier for improved mixing. The system may also include additional tanks such as a pretreatment tank and pump tank which are designed with baffled sidewalls for anchoring purposes.
    Type: Application
    Filed: April 8, 2008
    Publication date: October 8, 2009
    Applicants: GAST MANUFACTURING, INC., AERO-TECH
    Inventors: D. Mark Aker, Dan A. Papczynski, Caleb Youker
  • Publication number: 20090218280
    Abstract: A method for treating wastewater is disclosed. In step a), a predetermined volume of the wastewater is mixed in a first receptacle with a predetermined volume of sludge-containing returned denitrified mixed liquor under anaerobic conditions for a predetermined time period to produce an anaerobically mix rich in released phosphates. In step b), at least a portion of the anaerobically treated mix is then treated in a second receptacle under aerobic and anoxic conditions to produce a part-treated mix. In step c) at least a portion of solids from the part-treated mix to produce a low reduced-solids effluent. Steps b) and c) are sequential and cyclical and the treatment in step a) occurs during one or both of steps b) and c). In an alternative method, a predetermined volume of wastewater is treated under aerobic and anoxic conditions to produce a part-treated mix.
    Type: Application
    Filed: October 9, 2006
    Publication date: September 3, 2009
    Inventor: Juan Josse
  • Publication number: 20090211971
    Abstract: The invention relates to a method for the purification of effluent, in particular, effluent from the paper industry, comprising the following method steps: a) aerobic purification of the effluent using activated sludge in an activated sludge tank (1), b) settling of at least a part of the effluent/activated sludge mixture exiting the activated sludge tank (1) in a settling tank (2), c) separation of a part of the effluent/activated sludge mixture exiting the settling tank in a separating device (3) and d) recycling of at least a part of the activated sludge separated off in steps b) and/or c) into the activated sludge tank (1).
    Type: Application
    Filed: May 26, 2006
    Publication date: August 27, 2009
    Inventors: Harald Kraft, Hans-Thomas Armbruster, Wendelin Benz
  • Publication number: 20090166288
    Abstract: A method for treating waste-activated sludge comprises adding (1) a pozzolanic material to waste-activated sludge to form a mixture. The mixture is homogenized and aerated (2). The pozzolanic material reacts with the waste-activated sludge. The mixture is allowed to settle (3). A portion of the mixture is recirculated (4) from a downstream location to an upstream location. The recycled mixture includes pozzolanic material. Some embodiments provide advantages over existing wastewater treatment methods which may include: reduction or elimination of unpleasant odours, reduction of overall costs, conversion of waste into useful products, and/or reduction or elimination of discharged bacteria or other undesirable materials.
    Type: Application
    Filed: May 11, 2007
    Publication date: July 2, 2009
    Inventor: Gerd Peter Waschke
  • Publication number: 20090078646
    Abstract: Wastewaters are treated by an activated sludge process that includes combining wastewater with bacteria-laden sludge in an activated sludge tank to form a mixed liquor, separating the mixed liquor into a clear effluent and activated sludge stream, pretreating at least a portion of the activated sludge stream in a conditioning tank, transferring at least a portion of the activated sludge stream in the conditioning tank to an interchange bioreactor operating in batch or continuous flow mode, processing the activated sludge stream within the interchange bioreactor by selecting desired growth conditions to cultivate at least one type of bacteria in the activated sludge stream, and returning at least a portion of the activated sludge stream in the bioreactor to the activated sludge tank. The process may further include a sidestream reactor to remove phosphates from the activated sludge stream leaving the interchange bioreactor.
    Type: Application
    Filed: January 24, 2007
    Publication date: March 26, 2009
    Inventors: Betty-Ann Curtis, Thomas Kutcher, Marc E. Roehl
  • Patent number: 7507342
    Abstract: Introducing a combination of suspended attached growth Medias and biological reactants into a sewage treatment process with or without additional reaction to improve and increase capacity of a given process. Media and biological reactants can be disposed in a perforated container or flexible container that can be submerged in a sequencing bed reactor or the aeration and/or mixing tanks of an activated sludge sewage treatment process.
    Type: Grant
    Filed: February 15, 2007
    Date of Patent: March 24, 2009
    Inventor: William G. Smith
  • Patent number: 7501060
    Abstract: A wastewater treating system includes: a vessel defining a vessel space therein, the vessel space being partitioned into an activated sludge zone that is adapted to receive waste water and a body of an activated sludge therein, and a coarse filtering zone that is disposed downstream of and that is in fluid communication with the activated sludge zone for receiving bio-treated wastewater from the activated sludge zone; and a bed of biomass carriers colonized with microorganisms and disposed in the coarse filtering zone for further bio-treating the bio-treated wastewater from the activated sludge zone and for separating coarse suspended solids from the bio-treated wastewater in the coarse filtering zone.
    Type: Grant
    Filed: March 7, 2007
    Date of Patent: March 10, 2009
    Assignee: Kang Na Hsiung Enterprise Co., Ltd.
    Inventors: Yen-Jung Hu, Hsi-Yu Chen, Wen-Chun Hwang