A plant for the anaerobic purification of waste and/or process water comprising: i) a reactor tank with at least one feed line for supplying waste and/or process water into tank and with at least one outflow line for draining a mixture of microorganisms, waste and/or process water and gas from the tank, ii) a first separation apparatus outside and downstream of the tank for separating at least a part of the microorganisms from the mixture from the tank, wherein the first separation apparatus comprises at least one separation stage, an inlet line connected with at least one of the outflow line(s), at least one discharge line and at least one outlet line, and iii) a return line for returning the separated sludge separated into the reactor tank, wherein the return line connects with at least one of the at least one outlet line of the first separation apparatus.

Systems and methods for treating wastewater including a dissolved air flotation operation performed upon a portion of a mixed liquor output from a contact tank prior to the mixed liquor entering a biological treatment tank.

The invention relates to wastewater treatment systems with decentralized disposal of treated wastewater and methods of using the same. The invention further relates to methods of converting existing septic systems to a wastewater treatment plant system.

A septic system, including a septic tank and a pipe positioned within the septic tank, is provided. The pipe receives sewage and provides a flooded, anaerobic environment for sewage passing therethrough. The outlet of the pipe is positioned inside the septic tank and is optionally spaced from the outlet of the septic tank. In operation, the sewage introduced into the pipe generally separates into a solid portion comprising sludge, which remains in the pipe, and a liquid portion, which passes through and around the sludge. In one embodiment, the septic system has an absence of a sump chamber upstream of the septic tank.

An electrode assembly includes a hollow member having a hollow portion, an oxygen supply portion that supplies oxygen to the hollow portion, and an oxygen permeable portion that allows permeation of oxygen supplied to the hollow portion. Moreover, the electrode assembly includes: an electrode that is provided on an outside of the hollow member in the oxygen permeable portion and is composed by laminating a water-repellent layer having oxygen permeability and an electrically conductive layer on each other from the oxygen permeable portion side; and a buffer member that is provided in the hollow portion and has pressure resistance. Then, the electrode assembly is provided with air permeability from the oxygen supply portion to the oxygen permeable portion. A microbial fuel cell includes: the electrode assembly; and a negative electrode that supports microorganisms.

A wastewater spray distribution apparatus is operative to distribute wastewater produced by a sewage treatment system (10) onto a ground level (22) through operation of sprayers (118, 260). The exemplary sprayers include a manifold (142, 262) that includes outlet nozzles (158, 264) that can be readily removed and replaced. The exemplary manifold further includes interior areas bounded by surfaces that slope continuously downward from the outlet nozzles to the manifold inlet to assure the draining of water therefrom. Each of the nozzles include a base (140) which includes brake (207). A brake is provided in each nozzle and is adjustable to provide brake force to limit rotational movement produced by the thrust of water passing from the outlet nozzles to assure that the sprayer operates at the appropriate rotational speed. Alternative arrangements include manifolds including fixed or adjustable flaps and radially outwardly adjustable arms to adjust rotational properties.

The present invention is related to an anaerobic photobioreactor and a method for active biomass cultivation, wastewater treatment, nutrients recovery, energy production and high-value products synthesis. Phototrophic bacteria are cultured in the anaerobic photobioreactor lighted with solar or artificial irradiation where certain light wavelengths are selectively discarded with a light selector installed on the top of the photobioreactor. In this light-based process wastewater treatment and resources recovery, like nutrients and high-value bioproducts (fertilizers, polymers and proteins) present in wastewater are performed simultaneously. Cultured biomass is treated by anaerobic digestion for biofuel production, including optative hydrolytic pre-treatment, and/or valuable bioproducts can be obtained in a downstream process.

Disclosed are a device for strengthening anaerobic sludge digestion based on conical-coiled pipe coupling and an anaerobic sludge digestion method. The device comprises a feeder (A-3, B-3), a conical-coiled pipe coupling reactor (A-1, B-1) and a thermostat (A-4, B-4), wherein the bottom of the feeder (A-3, B-3) communicates with the top of the conical-coiled pipe coupling reactor (A-1, B-1), and the bottom of the feeder (A-3, B-3) is flush with the top of the thermostat (A-4, B-4); the conical-coiled pipe coupling reactor (A-1, B-1) is arranged in the thermostat (A-4, B-4); the whole coupling reactor (A-1, B-1) is in a regular cone shape or an inverted cone shape; and a main body of the coupling reactor (A-1, B-1) is a coiled pipe (A-2, B-2).

The disclosure relates to a staggered electrode bio-electro-Fenton groundwater circulation well system, including a groundwater circulation well, a water pumping and injecting assembly and an in-well bio-electro-Fenton assembly. The water pumping and injecting assembly is configured to realize water pumping and injection between different screening sections of the groundwater circulation well. The bio-electro-Fenton assembly arranged in a first screening section of the groundwater circulation well includes at least one electrode device. A cathode and an anode of the electrode device form a spatially staggered arrangement according to different distribution areas. According to the disclosure, the spatially staggered arrangement of the cathode and the anode, the influence of oxygen on an anaerobic environment of an anode chamber in the electrode device is greatly reduced while ensuring the cathode takes oxygen as an electron acceptor, and the constructed bio-electro-Fenton system can accelerate the decomposition of organic pollutants in the groundwater circulation well.

An induced sludge bed anaerobic reactor includes a vessel in which a septum is positioned to maintain solids in wastewater being treated toward a lower portion of the reactor. The septum is configured to prevent or minimize rising bacteria from exiting the vessel and to minimize clogging of the vessel. A first example septum is disclosed that is based on a linear vane design. A second example septum is disclosed that is based on a concentric vane design. A third example septum is disclosed that is based on a radial vane design that may include one or more sections. Further, septums may be layered one atop another to further minimize rising bacteria from exiting the vessel and to further minimize clogging of the vessel. Finally, a septum is attached to the inside of the vessel so as to allow it to move allowing any clogging waste floating under the septum to exit the vessel.