Abstract: A hollow fiber membrane module includes a hollow fiber membrane bundle consisted of a plurality of hollow fiber membrane filaments, end part(s) at one end or both ends of the hollow fiber membrane bundle, an air inlet pipe and a produced water pipe. An air distributing device having air distributing holes is disposed at an end surface of at least one of the end parts. The air distributing device is communicated with the air inlet pipe. The air distributing holes are opened towards roots of the hollow fiber membrane filaments. Either one end of the hollow fiber membrane bundle (5) has the end part or both ends of the hollow fiber membrane bundle have the end parts.

Abstract: A sewage treatment process is provided, which includes the following steps: a) sewage feeding step, comprising introducing raw sewage into a biological reaction tank (1) to a predetermined time or liquid level; b) reaction step comprising performing aeration and stirring intermittently in the biological reaction tank (1); c) treated water discharging step, comprising performing solid-liquid separation of the mixed liquid in the biological reaction tank (1) by a membrane separation device (2) to obtain a first permeate, which is taken as the final treated water; d) standby step comprising stopping aeration in the biological reaction tank (1); and e) phosphorus-enriched water discharging step, comprising keeping anaerobic condition in the biological reaction tank (1) and performing solid-liquid separation of the mixed liquid in the biological reaction tank (1) by a membrane separation device (2) to obtain a second permeate, the second permeate entering inside a phosphorus recycling unit (5) which is set indepen

Abstract: A method for cleaning a film separating device involves: a) performing positive-direction water cleaning when the ratio between the film filter resistance and the preliminary film filter resistance is less than 1.2; b) performing reverse water cleaning when the ratio between the film filter resistance and the preliminary film filter resistance is greater-than or equal-to 1.2; c) performing reverse chemical cleaning when the ratio between the film filter resistance and the preliminary film filter resistance is greater-than or equal-to 2; d) performing positive-direction chemical cleaning when the ratio between the film filter resistance and the preliminary film filter resistance is greater-than or equal-to 3.

Abstract: A sewage treatment process is provided, which includes the following steps: a) sewage feeding step, comprising introducing raw sewage into a biological reaction tank (1) to a predetermined time or liquid level; b) reaction step comprising performing aeration and stirring intermittently in the biological reaction tank (1); c) treated water discharging step, comprising performing solid-liquid separation of the mixed liquor in the biological reaction tank (1) by a membrane separation device (2) to obtain a first permeate, which is taken as the final treated water; d) standby step comprising stopping aeration in the biological reaction tank (1); and e) phosphorus-enriched water discharging step, comprising keeping anaerobic condition in the biological reaction tank (1) and performing solid-liquid separation of the mixed liquor in the biological reaction tank (1) by a membrane separation device (2) to obtain a second permeate, the second permeate entering inside a phosphorus recycling unit (5) which is set indepen

Abstract: An apparatus for treating wastewater is provided, which comprises a biological reaction tank and a membrane separation device. The membrane separation device is provided outside the biological reaction tank. A mixing device is provided inside the biological reaction tank and an aeration device is provided inside the membrane separation device or inside a container for loading the membrane separation device. The biological reaction tank is connected to the membrane separation device or the container for loading the membrane separation device through a pipeline. A process using the apparatus for treating wastewater is also provided.

Abstract: A method for cleaning a film separating device involves: a) performing positive-direction water cleaning when the ratio between the film filter resistance and the preliminary film filter resistance is less than 1.2; b) performing reverse water cleaning when the ratio between the film filter resistance and the preliminary film filter resistance is greater-than or equal-to 1.2; c) performing reverse chemical cleaning when the ratio between the film filter resistance and the preliminary film filter resistance is greater-than or equal-to 2; d) performing positive-direction chemical cleaning when the ratio between the film filter resistance and the preliminary film filter resistance is greater-than or equal-to 3.

Abstract: A hollow fiber membrane module includes a hollow fiber membrane bundle (5) consisted of a plurality of hollow fiber membrane filaments (3), end part(s) (6, 1) at one end or both ends of the hollow fiber membrane bundle (5), an air inlet pipe (9) and a produced water pipe (8). An air distributing device (11) having air distributing holes (13) is disposed at an end surface of at least one of the end parts. The air distributing device (11) is communicated with the air inlet pipe (9). The air distributing holes (13) are opened towards roots of the hollow fiber membrane filaments (3). The phrase “end part(s) at one end or both ends of the hollow fiber membrane bundle (5)” means that one end of the hollow fiber membrane bundle (5) has the end part or both ends of the hollow fiber membrane bundle (5) have the end parts.