Assignee: CH2M Hill, Inc.

Location: Englewood, CO
No. of patents: 32

Number	Title	Issue Date
8119003	Methods for reducing biosolids odors A method for reducing the odors of an anaerobically digested dewatered biosolids or other biosolids or sludge may include separating first anaerobically digested dewatered biosolids into first and second portions, storing second anaerobically digested dewatered bios...	02/21/2012
8105490	Low phosphorus water treatment systems 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...	01/31/2012
7968760	Treatment of particulate biodegradable organic waste by thermal hydrolysis using condensate recycle A method of treating particulate biodegradable organic waste by thermal hydrolysis. The method includes subjecting a quantity of the particulate biodegradable waste to thermal hydrolysis at a temperature above about 130° C. and a pressure at or above the saturated ...	06/28/2011
7927493	Low phosphorus water treatment methods 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...	04/19/2011
7754090	Portable ultraviolet water treatment apparatus A portable water treatment apparatus may include a container, a UV light source, and a user-powered generator. The container may include first and second portions removably joined or factory sealed together and defining a chamber to receive water. The UV light sourc...	07/13/2010
7745679	Method of waste stabilization with dewatered chemically bonded phosphate ceramics A method of stabilizing a waste in a chemically bonded phosphate ceramic (CBPC). The method consists of preparing a slurry including the waste, water, an oxide binder, and a phosphate binder. The slurry is then allowed to cure to a solid, hydrated CBPC matrix. Next,...	06/29/2010
7645092	Treatment of in ground chromium ore processing residue 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...	01/12/2010
7537699	Methods for reducing biosolids odors A method for reducing the odors of an anaerobically digested dewatered biosolids or other biosolids or sludge may include separating first anaerobically digested dewatered biosolids into first and second portions, storing second anaerobically digested dewatered bios...	05/26/2009
7446673	Intelligent wireless multicast network 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 co...	11/04/2008
7435340	Wastewater treatment system This disclosure describes wastewater treatment systems and methods of treating wastewater. In one exemplary method, a wastewater is split into first and second wastewater fractions. The first fraction is delivered to a membrane bioreactor, which may produce an efflu...	10/14/2008
7311834	Apparatus for the treatment of particulate biodegradable organic waste 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...	12/25/2007
7279102	Method of treating wastewater This disclosure describes wastewater treatment systems and methods of treating wastewater. In one exemplary method, a wastewater is split into first and second wastewater fractions. The first fraction is delivered to a membrane bioreactor, which may produce an efflu...	10/09/2007
H2198	Multi-stage pyrolysis systems for treating chlorine contaminated wastes 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 diox...	08/07/2007
7144510	Method and apparatus for treatment of a fluid stream 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...	12/05/2006
7138048	Apparatus and method for the removal of solids and floatables from a wastewater stream An apparatus for removing particulates from a wastewater stream includes a chamber having a wastewater inlet and wastewater outlet which promotes a generally horizontal wastewater flow. A grating is provided in the chamber between the wastewater inlet and the wastew...	11/21/2006
7103479	Method and system for evaluating water usage 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 a...	09/05/2006
7068161	Method and system for analyzing the security of a facility 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...	06/27/2006
7062406	Method and system for water quality trading 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 ...	06/13/2006
7029201	Utility line bedding for storm water management and storm water management system and method A water retaining and dissipating bedding for a utility line consists of an elongate trench formed in the earth. A filter fabric wrap is provided lining a lengthwise segment of the trench, with a lengthwise segment having a select length. A first select depth of a p...	04/18/2006
7025884	Method and apparatus for treatment of a fluid system A method for treating a fluid by providing raw fluid to a process tank, adding an ion exchange resin to the process tank to form a raw fluid/ion exchange resin mixture, removing treated fluid from the process tank through a membrane filter located within the process...	04/11/2006
7000711	Horizontal bore cryogenic drilling method A horizontal bore cryogenic drilling method includes in a first embodiment forming a pilot hole of a first select diameter along a desired path of the horizontal bore. A grindable casing is inserted into the guide bore. A cryogenic fluid is flowed through the grinda...	02/21/2006
6982036	Chemically enhanced primary sludge fermentation method 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 separat...	01/03/2006
6946073	Method for treating wastewater in a membrane bioreactor to produce a low phosphorus effluent 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, ...	09/20/2005
6905600	Method and apparatus for the treatment of particulate biodegradable organic waste 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 th...	06/14/2005
6893864	Apparatus for aerating a particulate material 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 pla...	05/17/2005
6863818	Method and apparatus for treating wastewater using membrane filters An apparatus using activated sludge for the removal of biological nutrients from a wastewater includes a bioreactor for containing a mixture of wastewater under treatment and activated sludge. The bioreactor is divided into a plurality of serially connected treatmen...	03/08/2005
6783681	Method and apparatus for treatment of drinking water 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...	08/31/2004
6728987	Method of adjusting the vertical profile of a cable supported bridge 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 assoc...	05/04/2004
6726750	Apparatus and method for efficient recovery of volatile organic compounds An apparatus for efficiently removing VOC from a plurality of remotely located sources of VOC contaminated gas streams includes a plurality of liquid absorbers, each located near and communicating with a source of a VOC contaminated gas stream, the liquid absorbers ...	04/27/2004
6723244	Method and apparatus to achieve nitrification at low solids retention times A new process configuration, which is based on nitrifier bioaugmentation, achieves essentially complete nitrification at low solids retention times (SRTs) on a year round basis for plants that have a minimum of two activated sludge treatment trains. The process util...	04/20/2004
6534306	Modular biofilter unit and method of use A biofilter apparatus includes at least one container having a height, length, and width containing a deep, low density, porous media within the container. An airflow apparatus is constructed and arranged to deliver a flow of air to be treated to the filt...	03/18/2003
5480548	Wastewater biological phosphorus removal process 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 a...	01/02/1996

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Assignee: CH2M Hill, Inc.