Abstract: The present invention relates to a mainstream deammonification process for removing ammonium from wastewater that suppresses NOB growth and produces a sludge having good settling characteristics, the process comprising: clarifying the wastewater stream in a primary clarifier (12) and producing a primary effluent; directing a first portion of the primary effluent to a biological treatment reactor (14) and removing carbon to produce treated wastewater; directing treated wastewater into an integrated fixed film activated sludge (IFAS) deammonification reactor (16) integrating nitritation and anammox processes and that is provided with intermittent aeration; directing a second portion of the primary effluent to the IFAS deammonification reactor (16) by-passing the biological treatment reactor (14), and injecting this second portion only during periods of air off and refraining from injecting during periods of air on, directing the IFAS deammonification reactor (16) effluent to a secondary clarifier (18) and produ

Abstract: The present invention relates to a side stream deammonification process where deammonification is performed by a non-continuous flow integrated fixed film activated sludge sequencing batch reactor (IFAS SBR) without the need of employing an external clarifier. More particularly, the present invention entails a single reactor designed to operate as an IFAS SBR or a moving bed bioreactor (MBBR). With the design of the single tank, the two operation modes, MBBR and IFAS SBR, are interchangeable depending on the treatment needs.

Abstract: The present invention relates to a method of treating sludge containing phosphorus, ammonia and magnesium and enhancing the dewaterability of the sludge. The sludge is directed into a biological fermenter operated under anaerobic conditions. By controlling the temperature of the sludge in the fermenter or the hydraulic retention time of the sludge in the fermenter, phosphorus, ammonia and magnesium is released from the solids in the sludge into a liquid forming a part of the sludge. Sludge from the fermenter is subjected to a solids-liquid separation process that produces a concentrated sludge and a liquid. The concentrated sludge or separated solids is directed to a thermal hydrolysis reactor that thermally hydrolyzes the concentrated sludge. After thermally hydrolyzing the concentrated sludge, the concentrated sludge is directed to an anaerobic digester that anaerobically digests the concentrated sludge.

Abstract: The present invention relates to a mainstream deammonification process for removing ammonium from wastewater that suppresses NOB growth and produces a sludge having good settling characteristics, the process comprising: clarifying the wastewater stream in a primary clarifier (12) and producing a primary effluent; directing a first portion of the primary effluent to a biological treatment reactor (14) and removing carbon to produce treated wastewater; directing treated wastewater into an integrated fixed film activated sludge (IFAS) deammonification reactor (16) integrating nitritation and anammox processes and that is provided with intermittent aeration; directing a second portion of the primary effluent to the IFAS deammonification reactor (16) by-passing the biological treatment reactor (14), and injecting this second portion only during periods of air off and refraining from injecting during periods of air on, directing the IFAS deammonification reactor (16) effluent to a secondary clarifier (18) and produ

Abstract: The present invention relates to a method of treating sludge containing phosphorus, ammonia and magnesium and enhancing the dewaterability of the sludge. The sludge is directed into a biological fermenter operated under anaerobic conditions. By controlling the temperature of the sludge in the fermenter or the hydraulic retention time of the sludge in the fermenter, phosphorus, ammonia and magnesium is released from the solids in the sludge into a liquid forming a part of the sludge. Sludge from the fermenter is subjected to a solids-liquid separation process that produces a concentrated sludge and a liquid. The concentrated sludge or separated solids is directed to a thermal hydrolysis reactor that thermally hydrolyzes the concentrated sludge. After thermally hydrolyzing the concentrated sludge, the concentrated sludge is directed to an anaerobic digester that anaerobically digests the concentrated sludge.

Abstract: An integrated fixed film activated sludge sequencing batch reactor is provided where both suspended biomass and biomass supported on biofilm carriers are utilized to biologically treat wastewater received by the sequencing batch reactor. The sequencing batch reactor includes two hydraulically connected tanks with suspended biomass being contained in at least one tank and biomass supported on biofilm carriers in the other tank.

Abstract: A process that utilizes ammonium oxidizing bacteria (AOB) and anaerobic ammonium oxidizing (ANAMMOX) bacteria to remove ammonium from a wastewater stream. Sludge separated from the wastewater in a mainstream is processed in a sidestream that includes an anaerobic digester, a dewatering system, and a biofilm reactor. The anaerobic digester produces digested sludge that is dewatered, producing reject water that includes a relatively high ammonium concentration and a relatively low organic carbon concentration and a relatively high temperature. The reject water is treated in a sidestream deammonification biofilm reactor that includes biofilm carriers seeded with AOB and ANAMMOX bacteria that are effective to remove ammonium from the reject water. AOB and ANAMMOX bacteria on the media carriers is utilized to contact the wastewater in the mainstream and to remove ammonium therefrom.

Abstract: A method is provided for removing BOD and ammonium from wastewater in a mainstream process that includes deammonification. Wastewater including BOD and ammonium is directed to a first sequence batch reactor (SBBR). The wastewater is treated in the first SBBR and in the process nitrite is accumulated such that the wastewater includes a nitrite-to-ammonium stoichiometric ratio that enables anammox bacteria to effectively remove ammonium and nitrite from the wastewater. Thereafter the wastewater is directed the wastewater from the first SBBR to a second SBBR. The second SBBR is operated under anoxic conditions and employs anammox bacteria to remove ammonium and nitrite from the wastewater. In certain embodiments, a pre-denitrification step or process is employed in the first SBBR to remove BOD.

Abstract: A process that utilizes ammonium oxidizing bacteria (AOB) and anaerobic ammonium oxidizing (ANAMMOX) bacteria to remove ammonium from a wastewater stream. Sludge separated from the wastewater in a mainstream is processed in a sidestream that includes an anaerobic digester, a dewatering system, and a biofilm reactor. The anaerobic digester produces digested sludge that is dewatered, producing reject water that includes a relatively high ammonium concentration and a relatively low organic carbon concentration and a relatively high temperature. The reject water is treated in a sidestream deammonification biofilm reactor that includes biofilm carriers seeded with AOB and ANAMMOX bacteria that are effective to remove ammonium from the reject water. In order to remove ammonium from the wastewater in the mainstream, the AOB and ANAMMOX bacteria on the media carriers is utilized to contact the wastewater in the mainstream and to remove ammonium therefrom.

Abstract: Biologically treated wastewater is directed as mixed liquor from a treatment tank to a downstream filtration tank having a having a submerged membrane module extending across the cross-sectional area of the filtration tank. Mixed liquor is directed from the bottom of the filtration tank upwardly into the membrane module such that substantially all of the mixed liquor received in the bottom of the filtration tank flows through the membrane module. A permeate stream is produced. A portion of a non-permeate stream is recirculated to the treatment tank. The filtration tank is sized such that there is no substantial recycle of mixed liquor in the filtration tank. Once the mixed liquor in the filtration tank makes one pass through the membrane module the mixed liquor is recycled to the treatment tank and generally not permitted to be recycled through the membrane module without first returning to the treatment tank.

Abstract: A membrane bioreactor system includes one or more biological reactors and one or more membrane tanks with each membrane tank having one or more membrane filters. To control membrane fouling, various process control variables are employed. First, the membrane filters are cleaned by an air scouring process where bubbles are moved upwardly adjacent the membrane filters and clean the same in the process. To control membrane fouling, a process is utilized that dynamically varies the air scouring flow rate (V) as a function of transmembrane pressure (TMP). In addition, the process entails allowing permeation to start and stop which results in a series of cycles where each cycle includes a permeation phase and a relaxation phase.

Abstract: A membrane bioreactor system includes one or more biological reactors and one or more membrane tanks with each membrane tank having one or more membrane filters. To control membrane fouling, various process control variables are employed. First, the membrane filters are cleaned by an air scouring process where bubbles are moved upwardly adjacent the membrane filters and clean the same in the process. To control membrane fouling, a process is utilized that dynamically varies the air scouring flow rate (V) as a function of transmembrane pressure (TMP). In addition, the process entails allowing permeation to start and stop which results in a series of cycles where each cycle includes a permeation phase and a relaxation phase.

Abstract: A multi-phase process for removing phosphorus from wastewater in a triple ditch or triple basin system where wastewater influent is sequentially directed to each of the three basins or ditches, sometimes referred to as first and second outer basins and an intermediate basin. During each phase of the process, the mixed liquor in at least one of the basins is subject to settling. In one or more phases of the process, the mixed liquor, in certain basins, is subjected to anaerobic and aerobic treatment. Anaerobic treatment results in the growth or proliferation of phosphorus storing microorganisms. These phosphorus-storing microorganisms take up phosphorus when the mixed liquor is subjected to aerobic conditions. One of the basins, the intermediate basin, can be designed to have a volume greater than either of the first or second outer basins. Further, the triple basin or triple ditch system is designed to transfer mixed liquor suspended solids or biomass from one basin to another.

Abstract: A multi-phase process for removing phosphorus from wastewater in a triple ditch or triple basin system where wastewater influent is sequentially directed to each of the three basins or ditches, sometimes referred to as first and second outer basins and an intermediate basin. During each phase of the process, the mixed liquor in at least one of the basins is subject to settling. In one or more phases of the process, the mixed liquor, in certain basins, is subjected to anaerobic and aerobic treatment. Anaerobic treatment results in the growth or proliferation of phosphorus storing microorganisms. These phosphorus-storing microorganisms take up phosphorus when the mixed liquor is subjected to aerobic conditions. One of the basins, the intermediate basin, can be designed to have a volume greater than either of the first or second outer basins. Further, the triple basin or triple ditch system is designed to transfer mixed liquor suspended solids or biomass from one basin to another.

Abstract: A multi-phase process for removing phosphorus from wastewater in a triple ditch or triple basin system where wastewater influent is sequentially directed to each of the three basins or ditches, sometimes referred to as first and second outer basins and an intermediate basin. During each phase of the process, the mixed liquor in at least one of the basins is subject to settling. In one or more phases of the process, the mixed liquor, in certain basins, is subjected to anaerobic and aerobic treatment. Anaerobic treatment results in the growth or proliferation of phosphorus storing microorganisms. These phosphorus-storing microorganisms take up phosphorus when the mixed liquor is subjected to aerobic conditions. One of the basins, the intermediate basin, can be designed to have a volume greater than either of the first or second outer basins. Further, the triple basin or triple ditch system is designed to transfer mixed liquor suspended solids or biomass from one basin to another.