Search Patents
  • LOW PHOSPHOROUS WATER TREATMENT METHODS AND SYSTEMS
    Publication number: 20080302723
    Abstract: A water or wastewater treatment system to reduce phosphorous or other pollutant concentrations in water or wastewater may include an optional primary treatment stage in fluid communication with a biological secondary treatment stage. The secondary treatment stage may, in turn, be fluidly connected with a tertiary treatment stage, which may include a chemical treatment portion for reducing phosphorous or other pollutants to desired levels. The precipitated phosphorous and other solids or sludge produced from the chemical treatment portion may be recycled upstream for reuse in the primary, secondary, and/or tertiary treatment stages. Such recycle may reduce the amount of added chemicals required in the tertiary treatment stage to phosphorous or other pollutants to desired amounts.
    Type: Application
    Filed: May 12, 2008
    Publication date: December 11, 2008
    Applicant: CH2M HILL, Inc.
    Inventor: Glen T. Daigger
  • Apparatus for the treatment of particulate biodegradable organic waste
    Publication number: 20070095734
    Abstract: An apparatus for treating particulate biodegradable organic waste includes a thermal hydrolysis reactor receiving the particulate biodegradable organic waste for performing thermal hydrolysis at a temperature of about 130° C. at a pressure at or above the saturated water vapor pressure of the organic waste to produce a slurry including solubilized organic material and residual solids. A pH adjustment means for adjusting the pH of the particulate biodegradable organic waste as necessary to provide an acidic pH of greater than about 3.15 before thermo hydrolysis of the particulate biodegradable organic waste is provided. Separating means receive the solubilized organic material and residual solids for separating solubilized organic material from the residual solids. An anaerobic reactor is configured to receive the solubilized organic material.
    Type: Application
    Filed: October 25, 2006
    Publication date: May 3, 2007
    Applicant: CH2M HILL, Inc.
    Inventor: John Lee
  • Method and system for analyzing the security of a facility
    Patent number: 7068161
    Abstract: A method and system for analyzing the security of a facility. The security system evaluates whether the elements of a facility comply with security requirements and provides a graphical representation of the facility with the results of the evaluation displayed. The security system provides a user interface through which security personnel can provide information describing the characteristics of each element of a facility. The security system then applies a rule for each security requirement to determine whether each element complies with the security requirement. The security system then displays a map of the facility with elements highlighted to indicate whether they comply with the security requirements.
    Type: Grant
    Filed: July 31, 2003
    Date of Patent: June 27, 2006
    Assignee: CH2M Hill, Inc.
    Inventors: Robert Alan Germaine, Christopher Steven Goz
  • Water Intake Structure
    Publication number: 20100224570
    Abstract: Water intake structures for power plants and other industrial facilities may include an inflow channel, a deep well, an outflow channel, and an intake channel These structures may include a fish screen, such as a wedge-wire screen or the like, positioned between the deep well and the intake channel to separate fish, fish larvae and fish eggs from water supplied to the intake channel from the deep well. These structures may further include one or more circulating or sweep flow pumps positioned proximate an outlet of the outflow channel. The sweep flow pumps may be used to maintain a sweep flow through the deep well of the intake structure to help sweep fish, fish larvae and fish eggs away from the fish screen and into the outflow channel.
    Type: Application
    Filed: February 17, 2010
    Publication date: September 9, 2010
    Applicant: CH2M HILL, Inc.
    Inventor: Peter Feher
  • Carbon dioxide enhanced complex-adsorption process for metal or metalloid removal from water
    Patent number: 6787041
    Abstract: A method of removing metal or metalloids, arsenic in particular, from groundwater or another source of contaminated water. The method comprises providing a water source, contacting the water source with CO2, whereby the pH of the water source is lowered to produce pretreated water, contacting the pretreated water with a metal or metalloid complex-adsorbing substance whereby contaminants are separated from the remainder of the pretreated water to produce metal or metalloid-depleted water, and stripping the CO2 from the metal or metalloid-depleted water, whereby the pH of metal or metalloid-depleted water is increased. A system for metal removal utilizing the CO2 process is also provided.
    Type: Grant
    Filed: June 28, 2002
    Date of Patent: September 7, 2004
    Assignee: CH2M Hill, Inc.
    Inventor: Joseph Daniel Chwirka
  • Low phosphorus water treatment systems
    Patent number: 8105490
    Abstract: A water or wastewater treatment system to reduce phosphorus or other pollutant concentrations in water or wastewater may include an optional primary treatment stage in fluid communication with a biological secondary treatment stage. The secondary treatment stage may, in turn, be fluidly connected with a tertiary treatment stage, which may include a chemical treatment portion for reducing phosphorus or other pollutants to desired levels. The precipitated phosphorus and other solids or sludge produced from the chemical treatment portion may be recycled upstream for reuse in the primary, secondary, and/or tertiary treatment stages. Such recycle may reduce the amount of added chemicals required in the tertiary treatment stage to phosphorus or other pollutants to desired amounts.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: January 31, 2012
    Assignee: CH2M Hill, Inc.
    Inventor: Glen T. Daigger
  • Low phosphorus water treatment methods
    Patent number: 7927493
    Abstract: A water or wastewater treatment system to reduce phosphorus or other pollutant concentrations in water or wastewater may include an optional primary treatment stage in fluid communication with a biological secondary treatment stage. The secondary treatment stage may, in turn, be fluidly connected with a tertiary treatment stage, which may include a chemical treatment portion for reducing phosphorus or other pollutants to desired levels. The precipitated phosphorus and other solids or sludge produced from the chemical treatment portion may be recycled upstream for reuse in the primary, secondary, and/or tertiary treatment stages. Such recycle may reduce the amount of added chemicals required in the tertiary treatment stage to phosphorus or other pollutants to desired amounts.
    Type: Grant
    Filed: May 12, 2008
    Date of Patent: April 19, 2011
    Assignee: CH2M Hill, Inc.
    Inventor: Glen T. Daigger
  • METHODS AND SYSTEMS FOR ENHANCING MERCURY, SELENIUM AND HEAVY METAL REMOVAL FROM FLUE GAS
    Publication number: 20090130013
    Abstract: A method for treating flue gas may include adding iron to a slurry in a ratio between approximately 20-to-1 and 5000-to-1 by weight of iron to a weight of mercury, selenium or other heavy metal to be removed from the flue gas, and contacting the slurry with the flue gas in a flue gas desulfurization system. A system for treating flue gas may include a scrubber, a slurry tank, and a water source. Water and limestone may be combined in the slurry tank to form a limestone slurry. At least a portion of the limestone slurry may be used to treat flue gas in the scrubber. Iron may be added to at least a portion of the limestone slurry used to treat flue gas in the scrubber. The iron used in either the method or system may be a ferrous or ferric salt, or elemental iron.
    Type: Application
    Filed: July 2, 2008
    Publication date: May 21, 2009
    Applicant: CH2M HILL, Inc.
    Inventor: Thomas E. Higgins
  • Wastewater biological phosphorus removal process
    Patent number: 5480548
    Abstract: The present invention relates to a process for treating wastewater utilizing a step feed return activated sludge process. The wastewater is directed via one or more step feed points through a mainstream process. The step feed point includes at least one aerobic zone and at least one anoxic zone, in repeating or alternating sequence. A portion of effluent from the one or more anoxic zones are fed through at least one anaerobic zone to which raw or pretreated wastewater is fed and returned to the upstream portion of the anoxic zone. Additionally, return activated sludge may be recycled to one or more of the anoxic zones.
    Type: Grant
    Filed: December 28, 1993
    Date of Patent: January 2, 1996
    Assignee: CH2M Hill, Inc.
    Inventors: Glen T. Daigger, Joseph P. Stephenson, Daniel A. Nolasco, Dalton R. Stafford, Douglas M. Kaupp
  • Rectangular tilt-up concrete tank construction
    Publication number: 20040261326
    Abstract: A rectangular tilt-up concrete tank includes a concrete slab with a metal plate anchored thereto, the metal plate defining at least one substantially linear concrete side wall location. A plurality of preformed concrete side panels each having metal plates attached along a bottom edge and opposing side edges are welded in a liquid-tight weld to the metal plate defining the concrete side wall location and a side metal plate of each side panel is welded to a metal side plate of an adjacent side panel in a liquid-tight weld to define a concrete side wall. Horizontal and vertical post-tensioning sleeves are provided in the side panels for receiving post-tensioning tendons.
    Type: Application
    Filed: June 24, 2003
    Publication date: December 30, 2004
    Applicant: CH2M HILL, Inc.
    Inventors: David Thomason, Mary Williams Goodson, Christian Carl Sundberg, Michael Louis Doleac
  • Intelligent Universal Wireless Adapter
    Publication number: 20120086580
    Abstract: A system for communication in an oil and gas well, the system including a controller, a first universal wireless adapter (UWA) wirelessly coupled to the controller, where the UWA is coupled to a first field device, a second UWA wirelessly coupled to the controller, where the UWA is coupled to a second field device, where the controller passes a control token among the first and second UWAs based upon communication traffic between the first and second UWA and the first and second field devices respectively. In some embodiments, this control token may be passed between the first and second UWAs depending upon communications between the respective UWAs and their field devices. For example, in the event that communication traffic is greater between the first UWA and the first field device, then the control token is passed to the first UWA.
    Type: Application
    Filed: October 6, 2010
    Publication date: April 12, 2012
    Applicant: CH2M Hill, Inc.
    Inventors: Cham Ocondi, Larry J. Compton, Mark Ocondi
  • Method and system for evaluating water usage
    Publication number: 20050246102
    Abstract: An evaluation system models water usage within a region. The evaluation system provides a graphical representation of various water system components. Each water system component has a model describing its water balance and parameters for customizing the model for an instance of the water system component. The evaluation system receives indications of water system components within the region along with connections between the water system components. The evaluation system receives values for parameters of the water system components. The evaluation system then calculates the water demand of the region by calculating the water balance of each water system component within the region based on the models for each water system component and the connections between the water system components. The evaluation system provides a cost-effective solution to manage water usage within the region.
    Type: Application
    Filed: January 14, 2005
    Publication date: November 3, 2005
    Applicant: CH2M HILL, Inc.
    Inventors: Avinash Patwardhan, Jared Thorpe, Muzaffar Eusuff, Greg Norby
  • Apparatus for aerating a particulate material
    Publication number: 20040082060
    Abstract: An apparatus for forcing airflow through (i.e., aerating) a particulate material consists of a planar bearing surface and a ventilation conduit underlying the planar bearing surface. A plurality of delivery conduits extend between the ventilation conduit and the planar bearing surface with a mouth of the delivery conduits being near the planar bearing surface. A grate, defining a plurality of openings, covers the mouth of each delivery conduit. Each grate has a top surface substantially parallel to the planar bearing surface and positioned at or no more than a select distance below the planar bearing surface. This select distance is close enough to the planar bearing surface to prevent the accumulation of particulate material over the grate as the particulate material is scraped from the planar bearing surface with an implement having a linear edge abutting the planar bearing surface.
    Type: Application
    Filed: October 23, 2002
    Publication date: April 29, 2004
    Applicant: CH2M HILL, Inc.
    Inventor: Jan Allen
  • Aluminum phosphate ceramics for waste storage
    Patent number: 8742195
    Abstract: The present disclosure describes solid waste forms and methods of processing waste. In one particular implementation, the invention provides a method of processing waste that may be particularly suitable for processing hazardous waste. In this method, a waste component is combined with an aluminum oxide and an acidic phosphate component in a slurry. A molar ratio of aluminum to phosphorus in the slurry is greater than one. Water in the slurry may be evaporated while mixing the slurry at a temperature of about 140-200° C. The mixed slurry may be allowed to cure into a solid waste form. This solid waste form includes an anhydrous aluminum phosphate with at least a residual portion of the waste component bound therein.
    Type: Grant
    Filed: February 26, 2004
    Date of Patent: June 3, 2014
    Assignee: CH2M Hill, Inc.
    Inventors: Arun Wagh, Martin D. Maloney
  • Method and System for Treating Wastewater
    Publication number: 20110132837
    Abstract: Methods and systems for utilizing biological wastewater treatment processes to remove nutrients from wastewater containing reduced sulfide compounds may include treating the wastewater in an anaerobic zone, an anoxic zone, and an aerobic zone. The wastewater is first treated in the anaerobic zone to uptake residual biodegradable organic material using specialized bacteria known as phosphorus accumulating organisms (“PAOs”) and glycogen accumulating organisms (“GAOs”). After treatment in the anaerobic zone, the wastewater is treated in an anoxic zone to convert nitrates to nitrogen gas and sulfur to sulfates. Following treatment in the anoxic zone, the wastewater is treated in the aerobic zone to oxidize ammonia to nitrate and to complete removal of phosphorus. After treatment in the aerobic zone, the wastewater may be treated in other zones, or may be delivered to a liquid-solids treatment stage.
    Type: Application
    Filed: December 7, 2010
    Publication date: June 9, 2011
    Applicant: CH2M HILL, Inc.
    Inventors: Glen T. Daigger, Julian Sandino, Steven J. Goodwin
  • Methods and Apparatuses for Optimizing Wells
    Publication number: 20110060472
    Abstract: Methods and apparatuses are disclosed for optimizing oil and gas wells. Some embodiments may include optimizing a gas well based upon continuous measurements of the well's operating parameters, such as casing pressure draw down and/or line pressure surges. These continuous measurements of the well's parameters may be utilized to derive an empirical model of the well's behavior that is more accurate than conventional approaches with respect to the various stages of well production. In other words, by measuring the well's operating parameters continuously and measuring certain well parameters (like casing pressure draw down and/or surges in line pressure from opening the well), the empirical model derived therefrom may provide more accurate control of turn on criteria of the well than conventional approaches, such as during the mature production stage of production of the well.
    Type: Application
    Filed: September 7, 2010
    Publication date: March 10, 2011
    Applicant: CH2M Hill, Inc.
    Inventors: Cham Ocondi, Gary E. Hughes
  • Method for treating wastewater in a membrane bioreactor to produce a low phosphorus effluent
    Patent number: 6946073
    Abstract: Removal of biological nutrients from a wastewater yielding a low phosphorous (e.g., less than 0.25 mg/L) output includes providing a serial multistage bioreactor containing activated sludge having in hydraulic series an anaerobic zone and a downstream aerobic zone, with each zone having an upstream inlet and a downstream outlet. The wastewater is provided to the anaerobic zone inlet. A quantity of chemical sufficient to precipitate soluble and particulate phosphorous is added to the downstream aerobic zone in an amount sufficient to yield a low phosphorous output. Treated water is separated from the activated sludge and precipitated phosphorous and a return activated sludge separated from the treated water is recycled to the anaerobic zone.
    Type: Grant
    Filed: September 2, 2003
    Date of Patent: September 20, 2005
    Assignee: CH2M Hill, Inc.
    Inventors: Glen T. Daigger, Edwin J. Fleischer, Albert M. Wollmann
  • Method and system for treating wastewater
    Patent number: 8721887
    Abstract: Methods and systems for utilizing biological wastewater treatment processes to remove nutrients from wastewater containing reduced sulfide compounds may include treating the wastewater in an anaerobic zone, an anoxic zone, and an aerobic zone. The wastewater is first treated in the anaerobic zone to uptake residual biodegradable organic material using specialized bacteria known as phosphorus accumulating organisms (“PAOs”) and glycogen accumulating organisms (“GAOs”). After treatment in the anaerobic zone, the wastewater is treated in an anoxic zone to convert nitrates to nitrogen gas and sulfur to sulfates. Following treatment in the anoxic zone, the wastewater is treated in the aerobic zone to oxidize ammonia to nitrate and to complete removal of phosphorus. After treatment in the aerobic zone, the wastewater may be treated in other zones, or may be delivered to a liquid-solids treatment stage.
    Type: Grant
    Filed: December 7, 2010
    Date of Patent: May 13, 2014
    Assignee: CH2M Hill, Inc.
    Inventors: Glen T. Daigger, Julian Sandino, Steven J. Goodwin
  • Method and apparatus for the treatment of particulate biodegradable organic waste
    Patent number: 6905600
    Abstract: A method for treating particulate biodegradable organic waste includes sizing the waste and adding a base prior to introducing the waste to a thermal hydrolysis reactor and hydrolyzing the waste at a temperature of about 130° C. or greater and a pressure greater than the saturated water vapor pressure to produce a slurry including solubilized organic material and residual solids. The solubilized organic material is separated from the residual solids using a liquid/solid separator and the solubilized organics are subjected to anaerobic digestion to produce a methane gas. The base is preferably potassium hydroxide (KOH) at a concentration of about 1%. The method may further include preheating the particulate biodegradable organic waste with latent heat of the separated solubilized organic material prior to thermal hydrolysis.
    Type: Grant
    Filed: October 31, 2002
    Date of Patent: June 14, 2005
    Assignee: CH2M Hill, Inc.
    Inventor: John W. Lee, Jr.
  • Apparatus for the treatment of particulate biodegradable organic waste
    Patent number: 7311834
    Abstract: An apparatus for treating particulate biodegradable organic waste includes a thermal hydrolysis reactor receiving the particulate biodegradable organic waste for performing thermal hydrolysis at a temperature of about 130° C. at a pressure at or above the saturated water vapor pressure of the organic waste to produce a slurry including solubilized organic material and residual solids. A pH adjustment means for adjusting the pH of the particulate biodegradable organic waste as necessary to provide an acidic pH of greater than about 3.15 before thermo hydrolysis of the particulate biodegradable organic waste is provided. Separating means receive the solubilized organic material and residual solids for separating solubilized organic material from the residual solids. An anaerobic reactor is configured to receive the solubilized organic material.
    Type: Grant
    Filed: October 25, 2006
    Date of Patent: December 25, 2007
    Assignee: CH2M Hill, Inc.
    Inventor: John W Lee, Jr.
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