Patents Assigned to Hampton Roads Sanitation District
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Patent number: 10112856Abstract: A method and a system for selecting and retaining solids with superior settling characteristics, the method comprising feeding wastewater to an input of a processor that carries out a treatment process on the wastewater, outputting processed wastewater at an output of the processor, feeding the processed wastewater to an input of a gravimetric selector that selects solids with superior settling characteristics, and outputting a recycle stream at a first output of the gravimetric selector back to the processor.Type: GrantFiled: January 21, 2016Date of Patent: October 30, 2018Assignees: Hampton Roads Sanitation District, D.C. Water & Sewer AuthorityInventors: Charles Bott, Maureen O'Shaughnessy, Bernhard Wett, Sudhir Murthy
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Patent number: 10005683Abstract: One or more reactor and one or more control methods are used for nitrogen removal in wastewater treatment to achieve measured control of maintaining high ammonia oxidizing bacteria (AOB) oxidation rates while achieving nitrite oxidizing bacteria (NOB) out-selection, using various control strategies, including: 1) ammonia and the use of ammonia setpoints; 2) operational DO and the use of DO setpoints; 3) bioaugmentation of anammox and lighter flocculant AOB fraction; and 4) implementation of transient anoxia in several reactor configurations and conditions for removal of oxidized nitrogen using anammox or heterotrophic organisms.Type: GrantFiled: May 16, 2016Date of Patent: June 26, 2018Assignees: D.C. Water & Sewer Authority, Hampton Roads Sanitation DistrictInventors: Bernhard Wett, Ahmed Omari, Pusker Regmi, Mark Miller, Charles B. Bott, Sudhir N. Murthy
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Patent number: 9902635Abstract: A method and a system as described herein, including a method and system of treating ammonium containing water in a deammonification MBBR process where partial nitritation and anaerobic ammonium oxidation may occur simultaneously in a biofilm, or in an integrated fixed film activated sludge process where partial nitritation takes place in a suspended growth fraction and anaerobic ammonium oxidation occurs in a biofilm. The method and system include controlling airflow to the reactor to achieve a target pH, a target alkalinity, a target specific conductivity, and/or a target ammonium concentration in the reactor or in the effluent.Type: GrantFiled: July 22, 2015Date of Patent: February 27, 2018Assignee: Hampton Roads Sanitation DistrictInventors: Charles Bott, Stephanie Klaus
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Patent number: 9469558Abstract: A reactor and control method thereof to maximize nitrogen removal and minimize aeration requirement through control of transient anoxia and aerobic SRT, repression of NOB, and control of dynamic DO concentrations or aeration interval by keeping the reactor NH4 and NOx concentrations approximately equal has been proposed. Controls described in this invention maximizes the potential for TIN removal through nitrification, limited nitritation, nitritation, denitrification, limited denitritation, denitritation making use of 1) real time measurement of ammonia, nitrite, nitrate, 2) operational DO and the proper use of DO setpoints, and 3) proper implementation of transient anoxia within a wide range of reactor configurations and operating conditions.Type: GrantFiled: October 1, 2013Date of Patent: October 18, 2016Assignees: D.C. Water & Sewer Authority, Hampton Roads Sanitation DistrictInventors: Pusker Regmi, Mark Miller, Charles B. Bott
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Patent number: 9352990Abstract: A reactor and control method for maximizing nitrogen removal and minimizing aeration requirements through control of transient anoxia and aerobic SRT, repression of NOB, and control of dynamic DO concentrations or aeration interval by keeping the reactor NH4 and NOx concentrations approximately equal. Controls are provided for maximizing the potential for TIN removal through nitrification, limited nitritation, nitritation, denitrification, limited denitritation, denitritation making use of 1) real time measurement of ammonia, nitrite, nitrate, 2) operational DO and the proper use of DO setpoints, and 3) proper implementation of transient anoxia within a wide range of reactor configurations and operating conditions.Type: GrantFiled: March 14, 2014Date of Patent: May 31, 2016Assignees: D.C. Water & Sewer Authority, Hampton Roads Sanitation DistrictInventors: Pusker Regmi, Mark Miller, Sudhir N. Murthy, Charles B. Bott
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Patent number: 9346694Abstract: One or more reactor and one or more control methods are used for nitrogen removal in wastewater treatment to achieve measured control of maintaining high ammonia oxidizing bacteria (AOB) oxidation rates while achieving nitrite oxidizing bacteria (NOB) out-selection, using various control strategies, including: 1) ammonia and the use of ammonia setpoints; 2) operational DO and the use of DO setpoints; 3) bioaugmentation of anammox and lighter flocculant AOB fraction; and 4) implementation of transient anoxia in several reactor configurations and conditions for removal of oxidized nitrogen using anammox or heterotrophic organisms.Type: GrantFiled: September 13, 2013Date of Patent: May 24, 2016Assignees: D.C. Water & Sewer Authority, Hampton Roads Sanitation DistrictInventors: Bernhard Wett, Ahmed Omari, Pusker Regmi, Mark Miller, Charles B. Bott, Sudhir N. Murthy
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Publication number: 20160137537Abstract: A method and a system for selecting and retaining solids with superior settling characteristics, the method comprising feeding wastewater to an input of a processor that carries out a treatment process on the wastewater, outputting processed wastewater at an output of the processor, feeding the processed wastewater to an input of a gravimetric selector that selects solids with superior settling characteristics, and outputting a recycle stream at a first output of the gravimetric selector back to the processor.Type: ApplicationFiled: January 21, 2016Publication date: May 19, 2016Applicants: Hampton Roads Sanitation District, D.C. Water & Sewer AuthorityInventors: Charles Bott, Maureen O'Shaughnessy, Bernhard Wett, Sudhir Murthy
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Patent number: 9340439Abstract: A reactor and control method thereof for nitrogen removal in wastewater treatment achieves a measured control of maintaining high ammonia oxidizing bacteria (AOB) oxidation rates while achieving nitrite oxidizing bacteria (NOB) repression, using various control strategies, including: 1) ammonia and the use of ammonia setpoints, 2) operational DO and the proper use of DO setpoints, 3) bioaugmentation of a lighter flocculant AOB fraction, and 4) proper implementation of transient anoxia within a wide range of reactor configurations and operating conditions.Type: GrantFiled: September 13, 2013Date of Patent: May 17, 2016Assignees: D.C. Water & Sewer Authority, Hampton Roads Sanitation DistrictInventors: Bernhard Wett, Ahmed Omari, Pusker Regmi, Mark Miller, Charles B. Bott, Sudhir N. Murthy
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Publication number: 20160023932Abstract: A method and a system as described herein, including a method and system of treating ammonium containing water in a deammonification MBBR process where partial nitritation and anaerobic ammonium oxidation may occur simultaneously in a biofilm, or in an integrated fixed film activated sludge process where partial nitritation takes place in a suspended growth fraction and anaerobic ammonium oxidation occurs in a biofilm. The method and system include controlling airflow to the reactor to achieve a target pH, a target alkalinity, a target specific conductivity, and/or a target ammonium concentration in the reactor or in the effluent.Type: ApplicationFiled: July 22, 2015Publication date: January 28, 2016Applicant: Hampton Roads Sanitation DistrictInventors: Charles Bott, Stephanie Klaus
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Patent number: 9242882Abstract: A method and a system for selecting and retaining solids with superior settling characteristics, the method comprising feeding wastewater to an input of a processor that carries out a treatment process on the wastewater, outputting processed wastewater at an output of the processor, feeding the processed wastewater to an input of a gravimetric selector that selects solids with superior settling characteristics, and outputting a recycle stream at a first output of the gravimetric selector back to the processor.Type: GrantFiled: November 27, 2013Date of Patent: January 26, 2016Assignees: Hampton Roads Sanitation District, D.C. Water & Sewer AuthorityInventors: Geert Nyhuis, Maureen O'Shaughnessy, Bernhard Wett, Charles Bott, Sudhir Murthy
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Publication number: 20150376043Abstract: A method and an apparatus for biological wastewater treatment that includes a biological selector and a physical selector. The apparatus comprises an internal biological reactor where wastewater and recycled biomass are combined to provide a high substrate and high electron acceptor gradient for generating morphological biomass features that favor granule formation over floc and filament formation, and an external gravimetric or external screen selector operating on the biomass waste stream for collecting and retaining densified biomass aggregates including dense granule selection and for wasting lighter filaments and flocs. In the method and apparatus, particles may be added to provide cores to promote the formation of aggregates encapsulating the seeded particles. The particles may be added as various materials, for example, in the bioreactor, to initiate or seed the formation of a granule, that could then be separated by or integrated with either the external gravimetric or external screen selector.Type: ApplicationFiled: June 30, 2015Publication date: December 31, 2015Applicants: D.C. Water & Sewer Authority, Hampton Roads Sanitation DistrictInventors: Bernhard Wett, Charles Bott, Sudhir Murthy, Haydee De Clippeleir
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Patent number: 9068335Abstract: A protective assembly for an operating nut of an actuator for a valve in an underground pipe system is comprised of a guide assembly and a mounting assembly. A riser pipe is used to access the operating nut from above ground. The protective assembly maintains alignment of the riser pipe at installation and as the ground shifts over time. The guide assembly is formed of a guide structure and a mounting collar that juts outwardly from the guide structure forming a flange. The mounting assembly has a first portion for attaching the mounting assembly to the flange, and a second portion for attaching the mounting assembly to the actuator.Type: GrantFiled: December 7, 2011Date of Patent: June 30, 2015Assignee: Hampton Roads Sanitation DistrictInventors: Don Butler, Eric Jackson
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Publication number: 20140263041Abstract: A reactor and control method for maximizing nitrogen removal and minimizing aeration requirements through control of transient anoxia and aerobic SRT, repression of NOB, and control of dynamic DO concentrations or aeration interval by keeping the reactor NH4 and NOx concentrations approximately equal. Controls are provided for maximizing the potential for TIN removal through nitrification, limited nitritation, nitritation, denitrification, limited denitritation, denitritation making use of 1) real time measurement of ammonia, nitrite, nitrate, 2) operational DO and the proper use of DO setpoints, and 3) proper implementation of transient anoxia within a wide range of reactor configurations and operating conditions.Type: ApplicationFiled: March 14, 2014Publication date: September 18, 2014Applicants: Hampton Roads Sanitation District, D.C. Water & Sewer AuthorityInventors: Pusker Regmi, Mark Miller, Sudhir N. Murthy, Charles B. Bott
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Publication number: 20140144836Abstract: A method and a system for selecting and retaining solids with superior settling characteristics, the method comprising feeding wastewater to an input of a processor that carries out a treatment process on the wastewater, outputting processed wastewater at an output of the processor, feeding the processed wastewater to an input of a gravimetric selector that selects solids with superior settling characteristics, and outputting a recycle stream at a first output of the gravimetric selector back to the processor.Type: ApplicationFiled: November 27, 2013Publication date: May 29, 2014Applicants: D.C. Water & Sewer Authority, Hampton Roads Sanitation DistrictInventors: Geert Nyhuis, Maureen O'Shaughnessy, Bernhard Wett, Charles Bott, Sudhir Murthy
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Publication number: 20140091035Abstract: A reactor and control method thereof to maximize nitrogen removal and minimize aeration requirement through control of transient anoxia and aerobic SRT, repression of NOB, and control of dynamic DO concentrations or aeration interval by keeping the reactor NH4 and NOx concentrations approximately equal has been proposed. Controls described in this invention maximizes the potential for TIN removal through nitrification, limited nitritation, nitritation, denitrification, limited denitritation, denitritation making use of 1) real time measurement of ammonia, nitrite, nitrate, 2) operational DO and the proper use of DO setpoints, and 3) proper implementation of transient anoxia within a wide range of reactor configurations and operating conditions.Type: ApplicationFiled: October 1, 2013Publication date: April 3, 2014Applicants: Hampton Roads Sanitation District, D.C. Water & Sewer AuthorityInventors: Pusker Regmi, Mark Miller, Charles B. Bott
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Publication number: 20140069864Abstract: One or more reactor and one or more control methods are used for nitrogen removal in wastewater treatment to achieve measured control of maintaining high ammonia oxidizing bacteria (AOB) oxidation rates while achieving nitrite oxidizing bacteria (NOB) out-selection, using various control strategies, including: 1) ammonia and the use of ammonia setpoints; 2) operational DO and the use of DO setpoints; 3) bioaugmentation of anammox and lighter flocculant AOB fraction; and 4) implementation of transient anoxia in several reactor configurations and conditions for removal of oxidized nitrogen using anammox or heterotrophic organisms.Type: ApplicationFiled: September 13, 2013Publication date: March 13, 2014Applicants: Hampton Roads Sanitation District, D.C. Water & Sewer AuthorityInventors: Bernhard Wett, Ahmed Omari, Pusker Regmi, Mark Miller, Charles B. Bott, Sudhir N. Murthy
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Publication number: 20140069863Abstract: A reactor and control method thereof for nitrogen removal in wastewater treatment achieves a measured control of maintaining high ammonia oxidizing bacteria (AOB) oxidation rates while achieving nitrite oxidizing bacteria (NOB) repression, using various control strategies, including: 1) ammonia and the use of ammonia setpoints, 2) operational DO and the proper use of DO setpoints, 3) bioaugmentation of a lighter flocculant AOB fraction, and 4) proper implementation of transient anoxia within a wide range of reactor configurations and operating conditions.Type: ApplicationFiled: September 13, 2013Publication date: March 13, 2014Applicants: Hampton Roads Sanitation District, D.C. Water & Sewer AuthorityInventors: Bernhard Wett, Ahmed Omari, Pusker Regmi, Mark Miller, Charles B. Bott, Sudhir N. Murthy
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Patent number: 6925895Abstract: A system for collecting a representative, non-contaminated sample includes a sample intake positioned in a chosen location within a body of liquid. A first conduit section transfers a sample, which has been withdrawn from the body of liquid, from the sample intake to the pump. A second conduit section transfers the sample from the pump to a receptacle for collecting the sample. The second conduit section is connected to the receptacle by means providing for an air and watertight seal for the receptacle, which is coupled with means providing for the escape of air from the receptacle during collection of the sample therein. The means providing for an air and watertight seal for the receptacle is a specially designed transfer cap.Type: GrantFiled: July 2, 2002Date of Patent: August 9, 2005Assignee: Hampton Roads Sanitation DistrictInventor: Daniel L. Barker
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Patent number: 4867883Abstract: A high-rate biological waste water treatment process for removing organic tter, phosphorus and nitrogen nutrients from municipal waste water comprising the steps of mixing the influent waste water in an initial anaerobic reactor zone to maintain the biological solvents in suspension with a denitrified mixed liquor from a downstream anoxic reactor zone, typically at a flow rate of 0.5 to two times the waste water flow rate. The reactor zone serves to select microorganisms capable of accumulating quantities of phosphorus in excess of that required for simple cell growth and reproduction. The phosphorus removal occurs due to the removal of excess sludge (waste activated sludge) produced in the process wherein such sludge can be removed from the clarifier underflow or as a mixed liquor directly from the biological reactor.Type: GrantFiled: June 13, 1988Date of Patent: September 19, 1989Assignee: Hampton Roads Sanitation District of the Commonwealth of VirginiaInventors: Glen T. Daigger, James R. Borberg, Liliana M. Morales