Provided herein are systems and methods for treating a wastewater stream. In one embodiment, a wastewater stream is treated using a settling tank, a membrane feed tank, and at least one filtration unit.

The present invention relates to a method and to a device for continuous cleaning of process water circulating in a device for treating waste paper. The process water is supplied, from a unit of the device, to an anaerobic reactor comprising a gas separator, and the cleaned process water is returned back to a unit of the device, wherein this unit is selected from: a pulper; screening device; dewatering unit; oxidation/reduction unit; centrifugal screening device; fine screening device; paper-machine mould section; paper-machine press section; reject treatment unit; fibre recovery unit; and drying section; wherein the content of inorganic solids in the reactor is measured and, if this content exceeds a pre-set limit value, process water from the reactor is continuously fed to a solid-liquid separator for separation into a fraction that is depleted of inorganic solids and a fraction that is enriched with inorganic solids, wherein the fraction that is depleted of inorganic solids is returned to the anaerobic reactor and the fraction that is enriched with inorganic solids is conveyed away out of the device, until the content of inorganic solids in the process water is less than the limit value.

The present invention relates to a method for converting one or more influent streams comprising organic compounds present in an aqueous liquid stream such as wastewater and optionally inorganic carbon compounds into an effluent stream comprising short chain organic molecules in a bioreactor comprising electrodes, said method comprising: • the electrochemical oxidation of said organic compounds, thereby forming inorganic carbon compounds; and; • the electrochemical of said inorganic compound such as ammonium, ammonia and sulfides present in an aqueous liquid stream entering the bioreactor. • the bio-electrochemical reduction of said inorganic carbon compounds, thereby forming short chained organic molecules (such as methane); characterized in that said bioreactor is an anaerobic bioreactor comprising a biofilm growing on the cathodes and optionally the anodes as well as microorganism in suspension.

The invention relates to an anaerobic waste water purification tower (21) comprising a sludge reactor (22) with a waste water inlet zone (23), an active zone (24), a first set (25) of three phase separating means for separating sludge, gas and water, comprising at least one layer of adjacent gas hoods (26) connected to a gas collector tank (27) positioned above the reactor (22),and a clean water effluent outlet (31), wherein the gas hoods (26) are hooded lamellas for improving the separation of gas, sludge and water.

A combined waste water and gas treatment system for efficiently decarbonizing and removing nitrogen, including a water feeding pump, a carbon capture device, an intermediate water tank, and an anaerobic ammonium oxidation reactor connected in sequence through pipelines, where the carbon capture device includes an anode chamber and a cathode chamber; an anode plate is arranged in the anode chamber; a cathode plate is arranged in the cathode chamber; a gas inlet pipe is further arranged at the cathode chamber; an air compressor is connected with the gas inlet pipe; a gas outlet pipe is arranged at a top of the carbon capture device; a water outlet in the intermediate water tank is fluidly communicated with a bottom end of the anaerobic ammonium oxidation reactor through a second water inlet pipe; the gas outlet pipe is fluidly communicated with the second water inlet pipe.

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.

The present disclosure relates to an integrated wastewater treatment apparatus and method, the apparatus comprises a first reactor module, a second reactor module, a sedimentation module and a gas-liquid separation module, the first reactor module comprises a first reactor and an anoxic reaction zone, an aerobic reaction zone, a first gas-gathering pressurized layer, a first water inlet pipe and an aeration device; the second reactor module comprises a second reactor, a second water inlet pipe, an anaerobic reaction zone and a second gas-gathering pressurized layer; the sedimentation module comprises a third reactor and a water outlet pipe; the gas-liquid separation module comprises a gas-liquid separator, an exhaust pipe, a first riser pipe, a second riser pipe and a return pipe. The apparatus can give full play to the advantages of the autotrophic biological denitrification process, meet the biochemical treatment requirements of wastewater with low C/N ratio.

A separation device for a fluid purification device is provided, the separation device comprising: at least three concentric enclosures including an outermost enclosure and an innermost enclosure and defining at least two concentric cavities; a plurality of spiral-shaped channels formed in each of the at least two concentric cavities, so that fluid can flow through said plurality of spiral-shaped channels; a fluid inlet, for receiving fluid, located in an upper section of an outermost cavity among the at least two concentric cavities, the fluid inlet corresponding to a gas outlet; a solids outlet, for discharging solids comprised in the fluid, located in a lower section of the separation device; and a liquid outlet, for discharging liquid comprised in the fluid, located in an upper section of at least one inner cavity among the at least two concentric cavities.

A device for removing nitrogen and carbon using microporous aerated biofilms is provided, which relates to the field of waste water treatment technologies. The device includes a carbon removal reactor, a first sedimentation tank, an anaerobic ammonia oxidation nitrogen removal reactor, and a second sedimentation tank which are sequentially communicated. A plurality of groups of first microporous aerated biofilm assemblies are arranged in the carbon removal reactor. A plurality of groups of second microporous aerated biofilm assemblies are arranged in the anaerobic ammonia oxidation nitrogen removal reactor. The carbon removal reactor is communicated with the second microporous aerated biofilm assemblies. In the device, nitrogen and carbon are removed via microorganisms loaded by the first microporous aerated biofilm assemblies and the second microporous aerated biofilm assemblies. Sludge loss is reduced by the first sedimentation tank and the second sedimentation tank.

The present disclosure relates to an integrated wastewater treatment apparatus and method, the apparatus comprises a first reactor module, a second reactor module, a sedimentation module and a gas-liquid separation module, the first reactor module comprises a first reactor and an anoxic reaction zone, an aerobic reaction zone, a first gas-gathering pressurized layer, a first water inlet pipe and an aeration device; the second reactor module comprises a second reactor, a second water inlet pipe, an anaerobic reaction zone and a second gas-gathering pressurized layer; the sedimentation module comprises a third reactor and a water outlet pipe; the gas-liquid separation module comprises a gas-liquid separator, an exhaust pipe, a first riser pipe, a second riser pipe and a return pipe. The apparatus can give full play to the advantages of the autotrophic biological denitrification process, meet the biochemical treatment requirements of wastewater with low C/N ratio.