Search Patents
  • GAS ACTUATED VALVE
    Publication number: 20100051110
    Abstract: A method and system to pulse at least one solenoid valve to regulate the volume of instrument air or other gas (e.g. nitrogen or natural gas) to the supply side or from the discharge side of a diaphragm actuator. The diaphragm actuator operates a primary variable flow/choke control valve in response to process control signals.
    Type: Application
    Filed: September 2, 2009
    Publication date: March 4, 2010
    Applicant: CH2M Hill, Inc.
    Inventor: Cham Ocondi
  • Method and apparatus for treatment of drinking water
    Patent number: 6783681
    Abstract: An apparatus and method for the treatment and purification of drinking water combines the use of an ion-exchange resin and a membrane filter (12) in a single process tank. The ion-exchange resin is removed from the process tank (14) and regenerated for reuse.
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: August 31, 2004
    Assignee: CH2M Hill, Inc.
    Inventors: Paul Mueller, Anthony G. Myers
  • Intelligent wireless multicast network
    Patent number: 7446673
    Abstract: Disclosed is a supervisory control and data acquisition (SCADA) system using a spread spectrum or licensed frequency data radio network and communication method therefore allowing multiple slave hosts and slave devices or remote terminal unit (RTU) the ability to communicate data connectivity in a wireless network environment.
    Type: Grant
    Filed: October 30, 2003
    Date of Patent: November 4, 2008
    Assignee: CH2M Hill, Inc.
    Inventor: Mark Ocondi
  • Semi-dynamic leach test device and methods of making and using
    Patent number: 9885647
    Abstract: Disclosed herein is an insert device for semi-dynamic leach testing, the insert device including a support and an absorptive polymer disposed on the support, the insert device characterized by a sheet-like form having a first and second major side. The device is useful in testing of both radial and unidirectional leaching of organic compounds into water from solid samples.
    Type: Grant
    Filed: April 9, 2015
    Date of Patent: February 6, 2018
    Assignee: CH2M HILL, INC.
    Inventors: Dennis G. Grubb, Dusty R. V. Berggren, Anthony Dalton-Atha
  • Method and system for grading the internal condition of a pipe
    Publication number: 20050209817
    Abstract: A method and system for ascertaining the overall internal conditions of pipes. A grading system calculates a grade for each pipe that is in the range of 1 to 100, which represents its overall condition. The system then calculates a defect type score for each defect type that factors in the severity of the defect type and the extent of the defects of that defect type. The system then combines the defect type scores of the defect types to generate an overall score for the internal condition of the pipe.
    Type: Application
    Filed: April 12, 2004
    Publication date: September 22, 2005
    Applicant: CH2M HILL, Inc.
    Inventors: Vani Kathula, Reginald Rowe
  • Well head for environmental extraction wells
    Patent number: 5701953
    Abstract: A well head for landfills or other sites at which waste has been disposed provides an enlarged chamber at the top of a well pipe holding hose and cable terminations on the walls of the chamber positioned out of the access path of the well pipe. A cover unattached to the hoses and cables can be removed for access without interference from the terminations. An extraction port in the cover defines a clear channel into the well pipe for sampling and monitoring equipment.
    Type: Grant
    Filed: October 2, 1996
    Date of Patent: December 30, 1997
    Assignee: CH2M Hill, Inc.
    Inventors: Philip P. Stecker, Christine M. Liethen
  • METHOD AND APPARATUS FOR TREATMENT OF A FLUID STREAM
    Publication number: 20070090050
    Abstract: A method for treating a fluid by providing a raw fluid to a process tank. The raw fluid may be water having varying degrees of contamination or another type of fluid. The method further consists of adding an ion exchange resin to the process tank to form a raw fluid/ion exchange resin mixture. After the fluid has been sufficiently contacted with the ion exchange resin, treated fluid is removed from the process tank through a membrane filter located within the process tank. The method is completed by regenerating the ion exchange resin within the same process tank.
    Type: Application
    Filed: December 5, 2006
    Publication date: April 26, 2007
    Applicant: CH2M Hill, Inc.
    Inventors: Paul Mueller, Anthony Myers
  • Method and apparatus for treatment of a fluid stream
    Publication number: 20050274674
    Abstract: A method for treating a fluid by providing a raw fluid to a process tank. The raw fluid may be water having varying degrees of contamination or another type of fluid. The method further consists of adding an ion exchange resin to the process tank to form a raw fluid/ion exchange resin mixture. After the fluid has been sufficiently contacted with the ion exchange resin, treated fluid is removed from the process tank through a membrane filter located within the process tank. The method is completed by regenerating the ion exchange resin within the same process tank.
    Type: Application
    Filed: August 22, 2005
    Publication date: December 15, 2005
    Applicant: CH2M HILL, INC.
    Inventors: Paul Mueller, Anthony Myers
  • Measurement and Control of Liquid Level in Wells
    Publication number: 20100101774
    Abstract: Methods and apparatuses are disclosed for measuring and controlling liquid levels in a well. The apparatus may include a plurality of sensors, the plurality of sensors comprising: a first sensor coupled to the well, the first sensor configured to measure a casing pressure, a second sensor coupled to the well, the second sensor configured to measure a tubing pressure, and a third sensor coupled to a motor that is further coupled to the well, the third sensor configured to measure at least one characteristic of the motor, and a processor coupled to the plurality of sensors, wherein the processor calculates a level of liquid in the well based upon measurements of at least two of the plurality of sensors.
    Type: Application
    Filed: October 29, 2008
    Publication date: April 29, 2010
    Applicant: CH2M HILL, Inc.
    Inventors: Cham Ocondi, Larry J. Compton
  • Method and system for water quality trading
    Patent number: 7062406
    Abstract: A method and system for calculating trading ratios between a buyer and a seller of water quality pollutant load credits. The water quality trading system (“WQTS”) inputs a definition of watershed and land uses of the watershed. The WQTS then calculates the load credits (e.g., the difference between total maximum daily load of the pollutant and the actual load needed) of applying various controls (e.g., best management practices and treatments) to the point sources and non-point sources of the watershed. The load credits take into consideration the uncertainty of the calculated loads.
    Type: Grant
    Filed: November 13, 2003
    Date of Patent: June 13, 2006
    Assignee: CH2M Hill, Inc.
    Inventors: Avinash S. Patwardhan, Aditya Tyagi
  • System and method for treatment of hazardous materials, e.g., unexploded chemical warfare ordinance
    Publication number: 20050192472
    Abstract: Systems and methods for treating hazardous materials are disclosed. One exemplary implementation provides a system for rendering chemical weapons materiel less hazardous. This system includes a detonation chamber, an expansion chamber, and an emission treater adapted to treat gas from detonation of the chemical weapons materiel. The emission treater yields a substantially dry residual waste stream and a treated gas suitable for venting to atmosphere. The emission treater may treat the gas with an alkaline powder that interacts with the gas, producing the residual waste stream.
    Type: Application
    Filed: April 7, 2004
    Publication date: September 1, 2005
    Applicant: CH2M HILL, Inc.
    Inventors: Jay Quimby, Richard Johnson, Alan Edwards, McRea Willmert, John Donovan
  • Method and apparatus for the treatment of particulate biodegradable organic waste
    Publication number: 20050274668
    Abstract: A method for treating particulate biodegradable organic waste includes adjusting the pH as necessary to provide an acidic pH 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 method may further include preheating the particulate biodegradable organic waste with latent heat of the separated solubilized organic material prior to thermal hydrolysis.
    Type: Application
    Filed: June 6, 2005
    Publication date: December 15, 2005
    Applicant: CH2M Hill, Inc.
    Inventor: John Lee
  • Method of adjusting the vertical profile of a cable supported bridge
    Patent number: 6728987
    Abstract: A method of modifying the vertical profile of a cable supported bridge. The method consists of sequentially adjusting a lower end of a series of supporting cables downward relative to the bridge superstructure and sequentially adjusting an attachment structure associated with the lower end of each cable to maintain the distance each cable has been adjusted. The adjustments preferably proceeds according to a pre-specified plan known as an adjustment sequence. The preparation of an adjustment sequence according to the methods disclosed allows the modification of the vertical profile of the bridge superstructure to be completed without overstressing any bridge members, and with predictable results.
    Type: Grant
    Filed: April 23, 2002
    Date of Patent: May 4, 2004
    Assignee: CH2M Hill, Inc.
    Inventor: John David Hinman
  • LOW PHOSPHORUS WATER TREATMENT SYSTEMS
    Publication number: 20110192776
    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: Application
    Filed: April 15, 2011
    Publication date: August 11, 2011
    Applicant: CH2M HILL, Inc.
    Inventor: Glen T. Daigger
  • Method and apparatus for treatment of a fluid stream
    Patent number: 7144510
    Abstract: A method for treating a fluid by providing a raw fluid to a process tank. The raw fluid may be water having varying degrees of contamination or another type of fluid. The method further consists of adding an ion exchange resin to the process tank to form a raw fluid/ion exchange resin mixture. After the fluid has been sufficiently contacted with the ion exchange resin, treated fluid is removed from the process tank through a membrane filter located within the process tank. The method is completed by regenerating the ion exchange resin within the same process tank.
    Type: Grant
    Filed: August 22, 2005
    Date of Patent: December 5, 2006
    Assignee: CH2M Hill, Inc.
    Inventors: Paul Mueller, Anthony G Myers
  • Carbon dioxide enhanced complex-adsorption process for metal or metalloid removal from water
    Publication number: 20030010720
    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: Application
    Filed: June 28, 2002
    Publication date: January 16, 2003
    Applicant: CH2M Hill, Inc.
    Inventor: Joseph Daniel Chwirka
  • Treatment of in ground chromium ore processing residue
    Patent number: 7645092
    Abstract: In methods for treatment of in ground chromium ore processing residue contamination, ferrous sulfide is provided as a substantially insoluble material in the residue deposit. The ferrous sulfide accordingly may remain substantially in place, in the pores of the soil or residue, even over long periods of time, regardless of underground water movement or diffusion. As a result, the ferrous sulfide may act continuously to chemically reduce and remove contamination. As hexavalent chromium diffuses from the soil or residue, it is reduced by the ferrous sulfide. The ferrous sulfide may be placed into the underground deposit by injecting a ferrous salt solution into the deposit, waiting for a precipitation to elapse, and then injecting a sulfide solution into the deposit.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: January 12, 2010
    Assignee: CH2M Hill, Inc.
    Inventor: Thomas E. Higgins
  • Chemically enhanced primary sludge fermentation method
    Publication number: 20050016920
    Abstract: A method of treating wastewater to increase effluent volatile fatty acid content consisting of providing wastewater to a primary treatment vessel and adding a select quantity of a chemical, typically an aluminum or iron salt, to the wastewater, enhancing the separation of organic matter. Separated organic matter is then removed from the chemically treated wastewater forming a primary sludge and a primary effluent. A portion of the primary sludge is fermented to form a volatile fatty acid rich liquor. The volatile fatty acid rich liquor may then be used with the primary effluent, directed to a bioreactor, thereby forming a volatile fatty acid enriched bioreactor feed. The volatile fatty acid enriched influent may be further treated through known biological phosphorous and nitrogen removal methods.
    Type: Application
    Filed: May 24, 2004
    Publication date: January 27, 2005
    Applicant: CH2M HILL, Inc.
    Inventor: Bruce Johnson
  • Method for treating wastewater in a membrane bioreactor to produce a low phosphorus effluent
    Publication number: 20050045557
    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: Application
    Filed: September 2, 2003
    Publication date: March 3, 2005
    Applicant: CH2M HILL, Inc.
    Inventors: Glen Daigger, Edwin Fleischer, Albert Wollmann
  • Multi-stage pyrolysis systems for treating chlorine contaminated wastes
    Patent number: H2198
    Abstract: A method of decontaminating solids contaminated with chlorinated hydrocarbons includes a first step of heating the contaminated solids at a temperature high enough to volatize chlorine contaminates but below a temperature range favorable to the formation of the dioxins and furans to dechlorinate the contaminated solids. Volatilized chlorine contaminates are removed from the dechlorinated contaminated solids. The dechlorinated contaminated solids are then purged with an inert gas to remove oxygen from the dechlorinated contaminated solids. Thereafter the dechlorinated contaminated solids are heated in the absence of oxygen to a temperature sufficient to crack hydrocarbons contaminating the solids to lower molecular weight hydrocarbons.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: August 7, 2007
    Assignee: CH2M Hill Inc.
    Inventor: Jay M. Quimby
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