Abstract: Methods of recovering nutrients from a high nitrogenous liquid waste are disclosed. The methods include collecting the high nitrogenous liquid waste, introducing the high nitrogenous liquid waste and an oxidant into a reactor to produce oxy-anions of nitrogen, maintaining a predetermined pH to control concentration of the oxy-anions of nitrogen, and concentrating the liquid to produce a concentrated product and a dilute water. Systems for recovering nutrients from a high nitrogenous waste are also disclosed. The systems include a solids-liquid separator, a reactor having an inlet fluidly connected to the solids-liquid separator and an inlet fluidly connected to a source of an oxidant, a pH control subsystem, and a dissolved solids concentrator.

Abstract: Processes and system are provided for digesting biosolids in a multistage digestion system. The processes and system are well suited for producing Class A biosolids and biogas containing a high content of methane. Methods and systems are also provided for recovery of phosphorus from wastewater and biosolids.

Abstract: A variable pore size filter media including an upper plate, a retainer, and a support profile disposed between the upper plate and the retainer. The variable pore size filter media also includes a plurality of wire rings disposed on the support profile and longitudinally distributed within a region between the upper plate and the retainer, the plurality of wire rings being distributed in a non-contiguous manner to form a plurality of spaces therebetween. The variable pore size filter media further includes a plurality of pores defined by the plurality of spaces between the plurality of wire rings and a pore size adjustment mechanism configured to vary a respective distance between each of the plurality of wire rings to increase or decrease a respective size of each of the plurality of pores by increasing or decreasing a size of each of the plurality of spaces.

Abstract: A vortex breaker for a particulate separator has a first set of vanes spaced along a perimeter of a first shape and a second set of vanes spaced along a perimeter of a second shape, where the second shape resides within the first shape. Each of the vanes has a top edge, a bottom edge, an inside edge, and an outside edge. The vanes in the first and second sets of vanes intersect the first and second shapes, respectively. The vanes in the first set are oriented in a first rotational direction, and the vanes in the second set are oriented in a second rotational direction that is opposite the first rotational direction. The first set of vanes and the second set of vanes define fluid flow paths between the outside edges and the inside edges of the sets of vanes.

Abstract: Disclosed is a rotating cored-type biological treatment device for wastewater with low carbon content and use thereof. The device includes a composite frame (1), several biological packing columns (2), a rotating tray (3), a rotating shaft, and a base (4), wherein the biological packing columns (2) are detachably mounted inside the composite frame (1); the rotating shaft is vertically arranged on the base (4) and can rotate; the rotating tray (3) is fixedly sheathed on the rotating shaft, and the composite frame (1) is disposed on the rotating tray (3); and the rotating tray rotates with the rotating shaft, which driving the composite frame (1) and the biological packing columns (2) therein to rotate. The rotating cored-type biological treatment device has the advantages of high efficiency and being renewable and environment-friendly, etc.

Abstract: The method isolates polyhydroxyalkanoate (PHA) from a PHA-rich bacterial biomass, to the PHA isolated by the method and to a PHA having specific properties. The method treats an aqueous suspension of the PHA-rich bacterial biomass with a minimal amount of sodium hypochlorite, a methanol wash and extraction of PHA from the biomass with dimethyl carbonate (DMC).

Abstract: To provide a new technique for efficiently recovering microplastics from water to be treated, in which problems of conventional techniques such as large energy consumption are solved. A method for recovering microplastics from water to be treated containing the microplastics, the method comprising a step of allowing algae having microplastic adsorption and recovery ability to be present in the water to be treated, in which the algae are algae that secrete a sticky substance, and an amount of a sticky substance secreted by the algae is such that a volume of a sticky substance secreted to an outside of cells is 0.25 times or more and 100 times or less compared to a cell volume.

Abstract: A method includes: (1) using a chelating agent, extracting divalent ions from a brine solution as complexes of the chelating agent and the divalent ions; (2) using a weak acid, regenerating the chelating agent and producing a divalent ion salt solution; and (3) introducing carbon dioxide to the divalent ion salt solution to induce precipitation of the divalent ions as a carbonate salt. Another method includes: (1) combining water with carbon dioxide to produce a carbon dioxide solution; (2) introducing an ion exchanger to the carbon dioxide solution to induce exchange of alkali metal cations included in the ion exchanger with protons included in the carbon dioxide solution and to produce a bicarbonate salt solution of the alkali metal cations; and (3) introducing a brine solution to the bicarbonate salt solution to induce precipitation of divalent ions from the brine solution as a carbonate salt.

Abstract: Water treatment method for simultaneous abatement of carbon, nitrogen and phosphorus, implemented in a sequencing batch moving bed biofilm reactor (SBMBBR) comprising carriers suitable for the development of a biofilm. The method comprises sequences of successive treatments, each treatment sequence comprising: an initial phase of anaerobic treatment, said initial phase of anaerobic treatment being followed by at least one aerobic/anoxic cycle consisting of: —an aerobic treatment phase so as to obtain an ammonium ion concentration that does not pass below a threshold concentration of ammonium ions; and a phase in which the biofilm is placed, at least locally, under anoxic conditions, this phase being concomitant with or posterior to said aerobic treatment phase; the threshold concentration of ammonium ions being calculated to allow the development of Anammox microorganisms during the phase in which the biofilm is placed, at least locally, under anoxic conditions.

Abstract: Described are apparatus, systems, and methods of improving cleaning of, e.g., stairs of swimming pools. Automatic swimming pool cleaners (APCs) capable of autonomous movement within water-containing vessels may be utilized to provide enhanced cleaning of sections of the vessels containing stairs or other angled surfaces.

Abstract: A method and plant for hydrolysis of a liquid substrate, having a dry solids content of between 2 and 30%, to be used in an anaerobic fermentation, digestion or another process aimed at producing or extracting methane or other valuable substances, which method and plant relies on the use of vacuum and several pulpers and one or several flashtanks in series for step-wise pre-heating and pressure reduction, respectively.

Abstract: Debris filters for automatic swimming pool cleaners may be formed of metal, carbon fibers, or composites more rigid than soft nylon bags. In at least one version, the filter may be made of, or include, steel or stainless steel. Non-uniform sizes, densities, and/or shapes of openings in the filtration material may be created to provide different levels of filtration in a single device.

Abstract: The present invention discloses a recirculating aquaculture system (RAS) and method for shrimp culture through SBR wastewater treatment. The RAS includes a control cabinet, culture tanks, a clean water tank, a clean water filling pipeline, a drainage pipeline, a buried activated sludge tank and a solid-liquid separation mechanism. The solid-liquid separation mechanism comprises a sludge pump, an input pipe, a plate and frame type filter press and a liquid output pipe. An input end of the sludge pump is immersed in sewage of the buried activated sludge tank; and a clean water output end of the plate and frame type filter press is connected with the buried activated sludge tank through the liquid output pipe.

Abstract: Swimming pool cleaning apparatus may include a cleaning unit intended to be immersed in a swimming pool and at least one liquid filter circuit between at least one liquid inlet and at least one liquid outlet via a filter chamber removable from the body of the cleaning unit. The filter chamber may include a cover and a filter basket. The cover may include components for fastening the filter basket and locking the filter chamber to the body of the cleaning unit. The locking component may be releasable and, when released, may cause an extraction handle to be deployed from the filter chamber and urged toward a predetermined position.

Abstract: An induced sludge bed anaerobic reactor system that includes at least two stages of bioreactor processing, a first-stage feeding system, a second-stage feeding system, a pH balancing system, an effluent recirculation system, a gas management system, at least one nitrogen reduction system, and a controller. In addition, the nitrogen reduction system(s) if configured for reducing an amount of one or more nitrogen compounds in a substrate mixture sufficient to procedure a non-toxic substrate mixture with respect to anaerobic digestion of the non-toxic substrate by the induced sludge bed anaerobic reactor system.

Abstract: A microbial carrier and a device for treating wastewater are provided. The microbial carrier includes a bacteriophilic material and a plurality of foam cells, wherein the foam cells are disposed in the bacteriophilic material. The bactericidal material is a reaction product of a composite, wherein the composition includes a hydrophobic polyvinyl alcohol and a cross-linking agent, wherein the surface energy of the hydrophobic polyvinyl alcohol is 30 mJ/m2 to 58 mJ/m2.

Abstract: Organic solid waste is pressed at a high pressure to separate the solid waste into a dry fraction and a wet fraction. The wet fraction is diluted and floatables (i.e. pieces of plastic and/or paper) in the wet fraction are comminuted. The wet fraction is then de-gritted before being sent to an anaerobic digester. Digestate is withdrawn from the digester from a free liquid surface of the digester. The digestate is filtered to extract comminuted floatables. The resulting filtrate is then composted or directly applied to land. A corresponding system comprises a press, a grinder, a hydrocyclone, an anaerobic digester, a filter and a dewaterer.

Abstract: A method for advanced nitrogen and phosphorus removal of domestic sewage based on DEAMOX in AOAO process with sludge double-reflux is disclosed. The method comprises allowing domestic sewage and returned sludge of the secondary sedimentation tank (3) to enter the anaerobic zone (2.1) of the AOAO reactor (2), firstly performing partial denitrification by the denitrifying bacteria, reducing nitrate-nitrogen in the returned sludge to nitrite-nitrogen, then converting ammonia-nitrogen and nitrite-nitrogen into nitrogen by anammox bacteria, and phosphate accumulating bacteria and denitrifying phosphate accumulating organisms performing anaerobic phosphate release and storing internal carbon source; then allowing part of the mixed liquid to enter the intermediate aerobic zone (2.2) of the AOAO bioreactor (2) to carry out phosphate uptake and nitrification reaction, allowing another part of the mixed liquid to enter the anoxic zone (2.

Abstract: An apparatus for cleaning a body of water includes a housing defining an interior passageway, with a mesh catch bag connected at the upper end of the inner passage. A power source and a submersible pump are electrically connected, and both connect to the housing. The pump draws water from the body of water, and directs it to a plurality of openings oriented on an inner surface of the housing. The openings direct water upwardly through the inner passage of the housing and through the catch bag, thereby drawing debris from beneath the housing upwardly through the housing and into the catch bag.

Abstract: A water changing device for aquaculture breeding, comprises a breeding box. A drainage pipe is inserted into the inner wall below the breeding box; the drainage pipe has an L-shaped structure, and the horizontal side is located at the lower side of the breeding box; a sealing block is tightly inserted above the drainage pipe; a circular ring is arranged on the outer side wall of the upper end of the drainage pipe; a groove is arranged above the circular ring along the circumferential direction, and a filter screen is tightly inserted into the groove; the side wall of the drainage pipe below the breeding box is fixedly connected with a horizontal rod, and one side of the side wall below the breeding box close to the horizontal rod is fixedly provided with a threaded rod.