Assembly for treating fluids, comprising a support (12) having a first and second oppositely arranged surfaces (121) for backing support of a semi permeable membrane (11), a first fluid conveying compartments (124) interposed between the first and second surfaces, a plurality of first fluid passages (126) extending from the first surface (121) and being in fluid communication with the first compartments (124), and a first duct attached to the support (12) and in fluid communication with the first compartments. The assembly comprises a second compartment (125) arranged for conveying fluid and different from the first compartment, and a second duct attached to the support (12) and configured to be in fluid communication with the second compartment (125).

A wastewater treatment system including a facultative-organism-adapted membrane bioreactor. The facultative-organism-adapted membrane bioreactor includes a reaction vessel, a membrane separation system, a water production system and an aeration system. The membrane separation system is disposed in the reaction vessel. The water production system communicates with the membrane separation system to pump a filtrate out of the membrane separation system. A wastewater treatment method using the facultative-organism-adapted membrane bioreactor includes: aerating the reaction vessel to enable a dissolved oxygen concentration in over 50% of the reaction vessel is smaller than 1 mg/L, a dissolved oxygen concentration in the membrane separation system is smaller than 2.0 mg/L, and a dissolved oxygen concentration in the reaction vessel excluding the membrane separation system to be greater than 0 and smaller than 1.0 mg/L.

A method for removing phosphorus by gasification, the method including: a) providing a membrane bioreactor including a reaction tank and a membrane separation system; b) aerating the reaction tank to control a redox potential in the reaction tank to be higher than −200 mV; and c) controlling the dissolved oxygen concentration around the membrane separation system to be greater than 0 and smaller than 2 mg/L and the dissolved oxygen concentration in the reaction tank excluding the membrane separation system to be greater than 0 and smaller than 1 mg/L, and allowing the dissolved oxygen concentration around the membrane separation system to be higher than the dissolved oxygen concentration in the rest zones of the reaction tank. A phosphorus removal system by gasification includes: a reaction tank, a membrane separation system, a water production system, an aeration system.

A method for wastewater treatment having a zero discharge of sludge, the method including: a) providing a membrane bioreactor system including a membrane separation system and a reaction vessel; and b) aerating the membrane separation system and the reaction vessel to control the dissolved oxygen concentration around the membrane separation system to be greater than 0 and smaller than 2 mg/L and the dissolved oxygen concentration in the reaction vessel excluding the membrane separation system to be greater than 0 and smaller than 1 mg/L. A wastewater treatment system having a zero discharge of sludge includes a membrane bioreactor system including: a reaction vessel, a membrane separation system, a water production system, and an aeration system.

A method of wastewater treatment using a membrane bioreactor, including: controlling aeration to enable a dissolved oxygen concentration to be 0 to 1.5 mg/L, and keeping the integrated reaction vessel under a facultative environment. A wastewater treatment system by the membrane bioreactor without physical area division includes a reaction vessel, a membrane separation system, a water production system, and an aeration system. The membrane separation system is disposed inside the reaction vessel. The water production system communicates with the membrane separation system to pump filtrate out of the membrane separation system. The aeration system is employed to aerate the reaction vessel and the membrane separation system.

The present disclosure relates to hollow fiber tangential flow filters, including hollow fiber tangential flow depth filters, for various applications, including bioprocessing and pharmaceutical applications, systems employing such filters, and methods of filtration using the same.

A method for treating domestic sewage includes: preliminarily treating the domestic sewage through a grating and a grit chamber, so as to remove large-particle solids in the domestic sewage; and subjecting the domestic sewage after the preliminary treatment to circulating anaerobic-oxic treatment in a membrane bioreactor (MBR). In the oxic treatment process, microorganisms oxidize nitrogen in the sewage into nitrite or nitrate. Under anaerobic conditions, denitrifying bacteria in the microorganisms reduce the nitrate, releasing molecular nitrogen or nitrous oxide. In the present invention, the MBR is filled with a quinone-based hollow fiber membrane. During the microbial denitrification, the quinone acts as an electron transfer carrier to participate in the denitrification to promote the reduction of the nitrate (nitrite), increasing the denitrification rate under anaerobic conditions, and achieving the purpose of efficient denitrification.

A process for treating domestic wastewater may include directing wastewater into a tank containing a membrane filter and mixed liquor. The process may include recirculating wastewater and mixed liquor from a top end of the tank into a bottom end of the tank via a recirculation conduit. The process may include introducing a flow of wastewater and mixed liquor from the recirculation conduit into an aeration device and drawing ambient air into the aeration device using the flow of wastewater and mixed liquor from the recirculation conduit. The process may also include drawing wastewater and mixed liquor proximately surrounding the aeration device into the aeration device using the flow of wastewater and mixed liquor from the recirculation conduit. The process may include aerating a mixture of wastewater and mixed liquor with the ambient air below the membrane filter.

The Fischer-Tropsch (FT) process creates significant amounts of water. The invention provides an aqueous composition comprising specified amounts of dissolved and suspended solids, low chemical oxygen demand and low chlorine demand, pH in the range of 6.5 to 8.0, where the aqueous composition comprises organic carbon derived from fossil sources.

The invention provides a dynamic membrane reactor with function of nitrogen and phosphorus removal and an operation method thereof, and comprises a biological treatment system, a dynamic membrane loading system and an automatic system. The operation method comprises the following steps. (1) Before the formation of dynamic membrane, a porous filter for phosphorus removal is used as a cathode, a conductive precision filter screen is used as an anode, and aerobic denitrifying bacteria are inoculated into the dynamic membrane reactor under certain constant current density, hydraulic retention time and flux. (2) After the dynamic membrane is formed, the porous filter for phosphorus removal is used as the anode, the conductive precision filter screen is used as the cathode. And intermittent aeration is started at the anode under certain constant current density. (3) When the transmembrane pressure difference exceeds a certain range, hydraulic backwashing is performed under certain constant current density.