US20110036771A1 - Ballasted anaerobic system and method for treating wastewater - Google Patents

Ballasted anaerobic system and method for treating wastewater Download PDF

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Publication number
US20110036771A1
US20110036771A1 US12/799,582 US79958210A US2011036771A1 US 20110036771 A1 US20110036771 A1 US 20110036771A1 US 79958210 A US79958210 A US 79958210A US 2011036771 A1 US2011036771 A1 US 2011036771A1
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Prior art keywords
weighting agent
separator
subsystem
weighted
anaerobic
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Abandoned
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US12/799,582
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English (en)
Inventor
Steven Woodard
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Siemens Industry Inc
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Individual
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Filing date
Publication date
Priority claimed from US12/008,216 external-priority patent/US7695623B2/en
Priority claimed from US12/584,545 external-priority patent/US8470172B2/en
Priority to US12/799,582 priority Critical patent/US20110036771A1/en
Application filed by Individual filed Critical Individual
Priority to EP11775393.9A priority patent/EP2563728A4/en
Priority to CN2011800214908A priority patent/CN102869618A/zh
Priority to PCT/US2011/000180 priority patent/WO2011136836A1/en
Publication of US20110036771A1 publication Critical patent/US20110036771A1/en
Assigned to CAMBRIDGE WATER TECHNOLOGY, INC. reassignment CAMBRIDGE WATER TECHNOLOGY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WOODARD, STEVEN
Assigned to SIEMENS INDUSTRY, INC. reassignment SIEMENS INDUSTRY, INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: CAMBRIDGE WATER TECHNOLOGY, INC.
Priority to US13/627,766 priority patent/US8623205B2/en
Priority to US14/094,447 priority patent/US8845901B2/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
    • C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
    • C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/12—Inert solids used as ballast for improving sedimentation

Definitions

  • This invention relates to a ballasted anaerobic system and method for treating wastewater.
  • One method of treating wastewater is to use an anaerobic treatment reactor.
  • the anaerobic treatment reactor is typically seeded with a population of microorganisms that ingest contaminants in the influent wastewater to form biological flocs or granules (hereinafter “biological flocs”).
  • Wastewater is typically fed into the bottom of the anaerobic treatment reactor and microorganisms consume the waste therein and from biological flocs. After a sufficient startup period, the biological flocs form an anaerobic sludge blanket near the bottom of the anaerobic treatment reactor.
  • wastewater is fed into the bottom of the anaerobic treatment reactor and flows upward through the anaerobic sludge blanket bringing the wastewater in contact with the microorganisms that consume the waste therein.
  • the treated wastewater then flows over the weir of the anaerobic treatment reactor as clean effluent.
  • This invention features a ballasted anaerobic system for treating wastewater including at least one anaerobic treatment reactor.
  • a weighting agent impregnation subsystem is configured to mix weighting agent with the biological flocs to form weighted biological flocs to create a weighted anaerobic sludge blanket in the at least one anaerobic treatment reactor.
  • a weighting agent recovery subsystem is configured to recover the weighting agent from excess sludge and reintroduce the weighting agent to the weighting agent impregnation subsystem.
  • the weighted anaerobic sludge blanket may be configured to treat wastewater and provide a treated effluent.
  • the weighting agent impregnation subsystem may include an impregnation tank and at least one mixer.
  • the weighting agent impregnation subsystem may include a storage subsystem for storing virgin weighting agent and dispensing the virgin weighting agent into the impregnation tank.
  • the weighting agent impregnation subsystem may include a venturi mixer/eductor.
  • the weighting agent recovery subsystem may include a separator subsystem for separating the weighting agent from the biological flocs.
  • the separator subsystem may include a shear mill.
  • the separator subsystem may include a centrifugal separator.
  • the separator subsystem may include an ultrasonic separator.
  • the separator subsystem may include a shear mill and a wet drum magnetic separator.
  • the separator subsystem may include a shear mill and a centrifugal separator.
  • the separator subsystem may include an ultrasonic separator and a wet drum magnetic separator.
  • the separator subsystem may include an ultrasonic separator and a centrifugal separator.
  • the shear mill may include a rotor and a stator, wherein the rotor and/or the stator includes slots sized as to optimize separation of weighting agent from the weighted biological flocs. A majority of the weighting agent may have a particle size less than about 100 ⁇ m.
  • a majority of the weighting agent may have a particle size less than about 40 ⁇ m. A majority of the weighting agent may have a particle size less than about 20 ⁇ m.
  • the weighting agent may include magnetite.
  • the system may include a wasting subsystem for wasting excess sludge to control the population of microorganisms. The capacity of the system may be increased by increasing the concentration of microorganisms solids in the anaerobic treatment reactor by reducing the amount of the sludge wasted by the wasting subsystem.
  • the weighted biological flocs may enhance the quality of the treated effluent by reducing suspended solids and associated contaminants therein.
  • This invention also features a ballasted anaerobic method for treating wastewater, the method including the steps of: a) receiving influent wastewater in at least one biological reactor, b) forming biological flocs in the at least one anaerobic treatment reactor, c) impregnating weighting agent into the biological flocs to form weighted biological flocs to create a weighted anaerobic sludge blanket, and d) recovering weighting agent from the weighted biological flocs to reintroduce the weighting agent to step c).
  • the method may include the step of directing the wastewater through the weighted anaerobic sludge blanket to provide a treated effluent.
  • the method may include the step of separating the weighting agent from the weighted biological flocs.
  • the method may include the step of collecting the weighting agent and recycling the weighting agent to step c).
  • the method may further include the step of providing weighting agent in which the majority of the weighting agent has a particle size less than about 100 ⁇ m.
  • the method may further include the step of providing weighting agent in which the majority of the weighting agent has having a particle size less than about 40 ⁇ m.
  • the method may further include the step of providing weighting agent in which the majority of the weighting agent has having a particle size less than about 20 ⁇ m.
  • the method may further include the step of enhancing the quality of the treated effluent by reducing suspended solids and associated contaminants therein.
  • FIG. 1 is a schematic side-view of one embodiment of the ballasted anaerobic system for treating wastewater of this invention
  • FIG. 2A is a schematic side-view showing in one example of a weighted sludge blanket formed at the bottom of the anaerobic treatment reactor shown in FIG. 1 ;
  • FIG. 2B is a schematic side-view of the system for treating wastewater shown in FIGS. 1 and 2A depicting one example of an effluent recycling line and gas collectors;
  • FIG. 3 is a microscopic photograph showing one example of weighting agent impregnated into biological flocs to form weighted biological flocs in accordance with this invention
  • FIG. 4 is a schematic side-view showing another embodiment of the weighting agent impregnation subsystem shown in FIG. 1 ;
  • FIG. 5A is a schematic side-view of one embodiment of the separator shown in FIG. 1 ;
  • FIG. 5B is a schematic top view showing one example of slots in the rotor and stator of the shear mill shown in FIG. 5A ;
  • FIG. 5C is a three-dimensional view of one embodiment of the shear mill in FIG. 5 A;
  • FIG. 6 is a three-dimensional front-view of another embodiment of the separator shown in FIG. 1 ;
  • FIG. 7 is a three-dimensional front-view of yet another embodiment of the separator shown in FIG. 1 .
  • System 10 includes at least one anaerobic treatment reactor 12 , e.g., a bulk volume fermenter (BVF) treatment reactor, an up-flow anaerobic sludge blanket (UASB) treatment reactor, an internal circulation (IC) treatment reactor, an anaerobic contactor, a continuous stirred reactor, or similar type reactor.
  • Anaerobic treatment reactor 12 receives flow of influent wastewater 14 by line 16 .
  • Anaerobic treatment reactor 12 is preferably covered as shown at 13 to create an anaerobic environment therein.
  • Influent wastewater 14 is typically high strength wastewater from ethanol plants, breweries, pharmaceutical plants, pulp and paper facilities, or any similar type facilities or plants. Influent wastewater 14 is typically fed into bottom 15 of anaerobic treatment reactor 12 by line 16 and flows in an upward direction, as shown by arrows 17 . Anaerobic treatment reactor 12 is preferably seeded with population of microorganisms which promotes growth of biological flocs 23 . After a sufficient startup period, sludge blanket 18 forms near bottom 15 of anaerobic treatment reactor 12 .
  • system 10 includes weighting agent impregnation subsystem 26 which impregnates biological flocs 23 to form weighted biological flocs 25 , FIG. 2A , to create weighted anaerobic sludge blanket 19 .
  • Weighting agent impregnation subsystem 26 FIGS. 1 and 2A , in one embodiment, includes impregnation tank 28 and mixer 30 which receives biological flocs from anaerobic sludge blanket 18 , FIG. 1 , and/or from weighted anaerobic sludge blanket 19 , FIG. 2A , by line 32 .
  • Impregnation tank 28 also preferably receives virgin weighting agent 33 , e.g., from feed hopper 34 by line 36 , and/or recycled weighting agent 38 from weighting agent recovery subsystem 74 (discussed below).
  • Mixer 30 mixes the biological flocs with virgin weighting agent 33 and/or with recycled weighting agent 38 in impregnation tank 28 to impregnate the weighting agent into the biological flocs to form weighted biological flocs 25 .
  • mixer 30 utilizes a mixing energy which is sufficient to impregnate the weighting agent into biological flocs to form weighted biological flocs.
  • weighting agent 33 , 38 impregnated into biological flocs 23 to form weighted biological floc 25 .
  • the weighted biological flocs are then sent back to anaerobic treatment reactor 12 by line 37 and/or line 37 ′ connected to line 16 to form weighted anaerobic sludge blanket 19 , FIG. 2A .
  • influent wastewater 14 is fed into bottom 15 of anaerobic treatment reactor 12 by line 16 and flows upward through weighted anaerobic sludge blanket 19 bringing the wastewater in contact with the microorganisms that consume the waste therein to provide treated effluent 50 which flows over weir 27 .
  • anaerobic treatment reactor 12 FIG. 2B
  • Anaerobic treatment reactor 12 may also include one or more gas collectors 64 , 66 , and 68 coupled to line 70 which remove methane, carbon dioxide, and other gases generated by the anaerobic process of system 10 discussed herein.
  • Treated effluent 50 may be recycled by line 41 to line 16 to maintain a constant upflow velocity in anaerobic treatment reator 12 , e.g., as shown by arrows 17 . Recycling treated effluent 50 may also be used to adjust the flow rate of the influent in line 16 .
  • weighted anaerobic sludge blanket 18 to form weighted anaerobic sludge blanket 19 , FIG. 2A .
  • system 10 can accommodate higher loading rates (flow rate/reactor size) of influent wastewater while preventing weighted sludge blanket 19 from becoming diffuse. Therefore, system 10 is more efficient and effective than conventional anaerobic treatment reactor systems.
  • the weighted biological flocs in weighted anaerobic sludge blanket 19 also improve the quality of the treated effluent by reducing suspended solids and associated contaminants therein.
  • the weighting agent may be magnetite, or any similar type weighting agent or magnetically separable inorganic material known to those skilled in the art which increases the density of the biological flocs.
  • the majority of the weighting agent particles have a size less than about 100 ⁇ m. In other examples, the majority of weighting agent particles has a size less than about 40 ⁇ m, or the majority of particle size of the weighting agent may be less than about 20 ⁇ m.
  • Weighting agent recovery subsystem 74 preferably includes separator 78 which recovers the weighting agent from the excess weighted biological flocs in line 76 and reintroduces (recycles) the weighting agent to weighting agent impregnation subsystem 26 .
  • Weighting agent recovery subsystem 74 may include recovery subsystem 83 , e.g., a wet drum magnetic separator or similar type device, which recovers the excess weighted biological flocs processed by separator 78 .
  • Recovery subsystem 83 reintroduces recovered weighting agent 38 to weighting agent impregnation subsystem 26 .
  • System 10 also preferably includes wasting subsystem 85 which wastes the excess sludge in line 76 generated by weighting agent recovery subsystem 74 by line 87 to control the population of microorganisms in anaerobic treatment reactor 12 .
  • the capacity of system 10 may be increased by increasing the concentration of microorganisms in weighted anaerobic sludge blanket 19 by reducing the amount of sludge wasted by wasting subsystem 85 .
  • Weighting agent impregnation subsystem 26 ′ may also utilize weighting agent impregnation subsystem 26 ′, FIG. 4 , where like parts have been given like numbers.
  • weighting agent impregnation subsystem 26 ′ includes venturi mixer/eductor 27 with nozzle 31 and funnel 45 which receives virgin weighting agent 33 , e.g., from tank 34 by line 36 , and/or recycled weighting agent 38 from separator 78 .
  • Venturi mixer/eductor 27 preferably receives sludge from anaerobic sludge blanket 18 , FIG. 1 , and/or from anaerobic sludge blanket 19 , FIG. 2A , by line 32 .
  • the velocity of sludge in line 32 is increased through nozzle 31 .
  • Virgin weighting agent 33 and/or recycled weighting agent 38 is dispensed into funnel 45 and then enters nozzle 31 by line 39 and travels downstream to line 37 and/or line 37 ′ as shown in FIGS. 1 and 2A .
  • the widening of line 37 , 37 ′, FIG. 4 , shown at 41 induces intimate mixing and entrainment, as shown at 43 .
  • This impregnates the virgin and/or recycled weighting agent into the biological flocs to form weighted biological flocs.
  • the weighted biological flocs are then returned to anaerobic treatment reactor 12 by line 37 , and/or line 37 ′, FIGS. 1 and 2A , to form weighted anaerobic sludge blanket 19 , FIG. 2A .
  • separator subsystem 78 discussed above may be configured as shear mill 112 , FIG. 5A , which shears the sludge in line 76 to separate the weighting agent from the weighted biological flocs.
  • Shear mill 112 ideally includes rotor 80 and stator 82 .
  • the excess sludge in line 76 enters shear mill 112 and flows in the direction of arrows 180 and enters rotor 80 and then stator 82 .
  • Shear mill 112 is designed such that there is a close tolerance between rotor 80 , FIG. 5B and stator 82 , as shown at 93 .
  • Rotor 80 is preferably driven at high rotational speeds, e.g., greater than about 1,000 r.p.m.
  • FIG. 5C shows in further detail the structure of one embodiment of shear mill 112 .
  • rotor 80 , FIGS. 5A-5C , and/or stator 82 includes slots which function as a centrifugal pump to draw the excess sludge from above and below rotor 80 and stator 82 , as shown by paths 182 , FIG.
  • rotor 80 may include slots 186
  • stator 82 may include slots 188 .
  • Slots 186 in rotor 80 and/or slots 188 in stator 82 are preferably optimized to increase shear energy to efficiently separate the weighting agent from the weighted biological flocs.
  • the shear developed by rotor 80 and stator 82 depends on the width of slots 186 and 188 , the tolerance between rotor 80 and stator 82 , and the rotor tip speed. The result is shear mill 112 provides a shearing effect which effectively and efficiently separates the weighting agent from the weighted biological flocs to facilitate recovery of the weighting agent.
  • separator subsystem 78 may be configured as ultrasonic separator 116 .
  • Ultrasonic separator 116 typically includes one or more ultrasonic transducers, e.g., ultrasonic transducer 262 , 264 , 266 , 268 , and/or 270 , available from Hielscher Ultrasonics GmbH, Stuttgart, Germany, which generates fluctuations of pressure and cavitation in the excess sludge in line 76 . This results in microturbulences that produce a shearing effect to create a mixture of weighting agent and obliterated flocs to effectively separate the weighting agent from the weighted biological flocs in the excess sludge. The resulting mixture of weighting agent and obliterated flocs exits ultrasonic separator 116 by line 79 .
  • separator subsystem 78 may be configured as centrifugal separator 118 .
  • Centrifugal separator 114 typically includes cylindrical section 302 located at the top of hydrocyclone 300 and conical base 304 located below section 302 .
  • the excess sludge in line 76 is fed tangentially into cylindrical section 302 via port 303 .
  • Smaller exit port 306 (underflow or reject port) is located at the bottom of conical section 304 and larger exit port 308 (overflow or accept port) is located at the top of cylindrical section 302 .
  • the centrifugal force created by the tangential feed of the sludge by port 303 causes the denser weighting agent to be separated from the biological flocs in the excess sludge.
  • the separated weighting agent is expelled against wall 308 of conical section 304 and exits at port 306 .
  • the recovered weighting agent 38 exits via port 306 and may be deposited to weighting agent impregnation system 26 , 26 ′, FIGS. 1 and 4 .
  • the less dense biological flocs remain in the sludge and exit via port 308 through tube 310 extending slightly into the body of the center of centrifugal separator 118 .
  • separator subsystem 78 may be configured as a shear mill, an ultrasonic separator, or a centrifugal separator, this is not a necessary limitation of this invention. In other designs, separator subsystem 78 may be configured as a tubular bowl, a chamber bowl, an imperforate basket, a disk stack separator, and the like, as known by those skilled in the art.
  • a separator 78 FIGS. 5A-5C
  • a wet drum magnetic separator or centrifugal separator 118 FIG. 7
  • separator subsystem 78 is configured as an ultrasonic separator 116 to create the mixture of weighting agent and obliterated biological flocs
  • a wet drum magnetic separator or centrifugal separator 118 may be used to recover the weighting agent therefrom.

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  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Treatment Of Sludge (AREA)
US12/799,582 2007-01-09 2010-04-27 Ballasted anaerobic system and method for treating wastewater Abandoned US20110036771A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US12/799,582 US20110036771A1 (en) 2007-01-09 2010-04-27 Ballasted anaerobic system and method for treating wastewater
PCT/US2011/000180 WO2011136836A1 (en) 2010-04-27 2011-01-31 Ballasted anaerobic system and method for treating wastewater
EP11775393.9A EP2563728A4 (en) 2010-04-27 2011-01-31 ANAEROBIC SYSTEM WITH PRE-SWITCHING AND METHOD FOR TREATMENT OF WASTEWATER
CN2011800214908A CN102869618A (zh) 2010-04-27 2011-01-31 用于处理废水的压载厌氧系统和方法
US13/627,766 US8623205B2 (en) 2007-01-09 2012-09-26 Ballasted anaerobic system
US14/094,447 US8845901B2 (en) 2007-01-09 2013-12-02 Ballasted anaerobic method for treating wastewater

Applications Claiming Priority (5)

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US87937307P 2007-01-09 2007-01-09
US99455307P 2007-09-20 2007-09-20
US12/008,216 US7695623B2 (en) 2007-01-09 2008-01-09 System and method for enhancing an activated sludge process
US12/584,545 US8470172B2 (en) 2007-01-09 2009-09-08 System for enhancing a wastewater treatment process
US12/799,582 US20110036771A1 (en) 2007-01-09 2010-04-27 Ballasted anaerobic system and method for treating wastewater

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US12/584,545 Continuation-In-Part US8470172B2 (en) 2007-01-09 2009-09-08 System for enhancing a wastewater treatment process

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US13/627,766 Continuation US8623205B2 (en) 2007-01-09 2012-09-26 Ballasted anaerobic system

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US12/799,582 Abandoned US20110036771A1 (en) 2007-01-09 2010-04-27 Ballasted anaerobic system and method for treating wastewater
US13/627,766 Active US8623205B2 (en) 2007-01-09 2012-09-26 Ballasted anaerobic system
US14/094,447 Active US8845901B2 (en) 2007-01-09 2013-12-02 Ballasted anaerobic method for treating wastewater

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US14/094,447 Active US8845901B2 (en) 2007-01-09 2013-12-02 Ballasted anaerobic method for treating wastewater

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EP (1) EP2563728A4 (zh)
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US8470172B2 (en) 2007-01-09 2013-06-25 Siemens Industry, Inc. System for enhancing a wastewater treatment process
US8540877B2 (en) 2007-01-09 2013-09-24 Siemens Water Technologies Llc Ballasted sequencing batch reactor system and method for treating wastewater
US8623205B2 (en) 2007-01-09 2014-01-07 Siemens Water Technologies Llc Ballasted anaerobic system
WO2014012817A1 (de) * 2012-07-19 2014-01-23 Voith Patent Gmbh Anaerobe abwasserbehandlung mit schlammentgasung und schlammrückfuhr sowie behandlungsanlage
US20140131273A1 (en) * 2012-09-21 2014-05-15 D.C. Water & Sewer Authority Method and apparatus for wastewater treatment using screens
US8840786B2 (en) 2007-01-09 2014-09-23 Evoqua Water Technologies Llc System and method for removing dissolved contaminants, particulate contaminants, and oil contaminants from industrial waste water
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US9651523B2 (en) 2012-09-26 2017-05-16 Evoqua Water Technologies Llc System for measuring the concentration of magnetic ballast in a slurry
US10464832B2 (en) * 2012-09-21 2019-11-05 D.C. Water & Sewer Authority Apparatus for water treatment using a physical separator
US10919792B2 (en) 2012-06-11 2021-02-16 Evoqua Water Technologies Llc Treatment using fixed film processes and ballasted settling
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US9242882B2 (en) * 2012-11-27 2016-01-26 Hampton Roads Sanitation District Method and apparatus for wastewater treatment using gravimetric selection
CN106882871B (zh) * 2017-03-06 2020-04-10 浙江大学 一种强化厌氧微生物活性的纳米磁铁矿耦合废水处理工艺
CN108690915A (zh) * 2017-04-06 2018-10-23 华东理工大学 一种从含铂废水回收铂炭的方法
US10683162B2 (en) 2017-05-18 2020-06-16 Evoqua Water Technologies Llc Digester cover left-in-place ballast ring
MX2023010727A (es) 2021-03-12 2024-02-06 Hampton Roads Sanitation Distr Metodo y aparato para deseleccion multiple en tratamiento de aguas residuales.

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US20130020255A1 (en) 2013-01-24
CN102869618A (zh) 2013-01-09
US8845901B2 (en) 2014-09-30
EP2563728A1 (en) 2013-03-06
US20140102977A1 (en) 2014-04-17

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