Presented herein is a voltaic cell containing a biofilm for facilitating energy conversion in a bioelectrochemical energy conversion cell where the biofilm includes one or more microbial populations.

The invention relates to a Novosphingobium sp. SJB007 and an application thereof in removal of phosphorus from wastewater, belonging to the technical field of environmental microorganisms. One aspect of the invention provides a Novosphingobium sp. SJB007 with an access number of CGMCC (China General Microbiological Culture Collection Center) No. 21177. Another aspect of the invention provides an application of the Novosphingobium sp. SJB007 in removal of phosphorus from wastewater. The efficient phosphorus-accumulating strain Novosphingobium sp. SJB007 provided by the invention has a high removal rate of more than 97% when the concentration of phosphorus in the wastewater is 10-30 mg/L under an appropriate condition.

In one or more embodiments, the present invention relates to a method for producing a polyhydroxybutyrate-based resin. The method includes (a) disrupting or solubilizing microbial cells containing a polyhydroxybutyrate-based resin, and (b) separating the polyhydroxybutyrate-based resin from a composition obtained by the process (a). The process (a) and the process (b) use water with a calcium ion concentration (14.5 mg/L or less. The water used in the process (a) and the process (b) is preferably obtained by subjecting wastewater that is discharged from the production process of the polyhydroxybutyrate-based resin to microbial anaerobic and aerobic treatments, subsequently pre-filtration by a membrane bioreactor process, and further filtration with a calcium ion removal membrane This method provides the polyhydroxybutyrate-based resin with good color tone and high thermal stability.

The application relates to a method for remediation and/or restoration of an anoxic body of water (10), wherein a calcium nitrate solution (3) is added to the anoxic body of water (10), and wherein the method comprises the steps of mixing water having a percent of oxygen saturation of between 50% and 150% with the calcium nitrate solution (3), resulting in a mixture, and pumping the mixture into the anoxic body of water (10), wherein the final concentration of nitrate-N in the remedied and/or restored anoxic body of water (10) is between 1 and 20 mg/l. The application furthermore relates to a system (1) for remediation and/or restoration of an anoxic body of water (10), wherein the system (1) is provided with means to add a calcium nitrate solution (3) to the anoxic body of water (10), wherein the means to add the calcium nitrate solution (3) to the anoxic body of water (10) consists of a mixing device (2) arranged to mix the calcium nitrate solution (3) with water having a percent of oxygen saturation of between 50% and 150%, resulting in a mixture, and wherein the system (1) comprises first pumping means (5) for pumping the mixture into the anoxic body of water (10).

A synergetic system for waste treatment is provided. The synergetic system includes a waste treatment system configured to perform biological treatment of waste. Additionally, the synergetic system includes a gas purification system configured to purify exhaust gas generated during the biological treatment of the waste. The synergetic system further includes a feeding system configured to feed excess heat from the gas purification system back to the waste treatment system. The waste treatment system is further configured to use the fed back excess heat for the biological treatment of the waste.

A wastewater treatment plant and related method comprise a treatment stage including a biological-process substage configured for growing unicellular organisms adapted to reduce contaminants in the wastewater which are dissolved, including at least one of organic matter and nitrogenous matter, by digestion thereof, and which are adapted to floc after digestion and a floc-removal substage downstream from the biological-process substage, relative to the flow of wastewater, and configured for substantially removing the unicellular organisms that have flocked. The treatment stage is configured to form majority and minority flows of treated wastewater, and the minority flow is configured to be recycled upstream of the biological-process treatment substage. The plant includes a heat transfer assembly configured for transferring heat from the majority flow of treated wastewater to the minority flow thereof to increase temperature of wastewater to be treated.

In some embodiments, the present disclosure relates to a system for treating an intake fluid comprising a contaminant, the system comprising a strainer configured to receive the intake fluid and separate the intake fluid into a first retentate and a strained filtrate; a filtration unit connected to the strainer through a strained fluid connector, the strained fluid connector configured to facilitate transfer of the strained filtrate from the strainer to the filtration unit, wherein the filtration unit is configured to separate the strained filtrate into a second retentate and a filtration unit filtrate; a fixed film biological filter connected to the filtration unit through a filtrate connector, the filtrate connector configured to facilitate transfer of the filtration unit filtrate from the filtration unit to the fixed film biological filter, wherein the fixed film biological filter is configured to reduce a biological oxygen demand of at least one of the filtration unit filtrate and a contaminant concentrating module permeate to form a permeate; and a CCM connected to a first retentate connector and a second retentate connector, the first retentate connector configured to facilitate transfer of the first retentate from the strainer to the CCM, the second retentate connector configured to facilitate transfer of the second retentate from the filtration unit to the CCM, wherein the CCM is configured to separate each of the first retentate and the second retentate into a third retentate and the contaminant concentrating module permeate.

Systems and methods for aeration and mixing processes are disclosed.

Systems and methods for aeration and mixing processes are disclosed.

A device and method for treating urban domestic sewage based on a two-stage combined process of partial denitrification-anammox belong to the field of biological sewage treatment. The device includes a raw water tank, a sequencing batch biofilm reactor (SBBR), an intermediate water tank, an up-flow anaerobic sludge bed (UASB) and a water outlet tank. A part of urban domestic sewage enters the SBBR and is mixed with residual sewage in the last cycle, a partial denitrification-anammox reaction is carried out under a stirring condition to remove nitrate nitrogen and a part of ammonia nitrogen, followed by a nitrification under an aeration condition to completely convert ammonia nitrogen into nitrate nitrogen, and effluent enters the intermediate water tank; and the other part of the urban domestic sewage is mixed with the effluent of the SBBR and continuously enters the UASB, and nitrite nitrogen, which is generated by nitrate nitrogen reduction, and ammonia nitrogen, are removed by means of anammox. According to the present invention, with no need of adding an external carbon source, organic matters in sewage can be effectively removed, the nitrogen removal efficiency of urban domestic sewage is improved, and efficient and low-consumption nitrogen removal is realized.