A membrane bioreactor

Abstract

The invention discloses a membrane bioreactor which comprises a membrane assembly and a gas-water separation device, wherein the membrane assembly can be arranged in a mud-water mixed solution; the membrane assembly comprises a filter membrane and a water production inner cavity which is formed by the filter membrane; the water production inner cavity is communicated with the gas-water separation device through a water production pipe; the gas-liquid separation device comprises a piston barrel and a piston which is arranged in the piston barrel and used for dividing the inner cavity of the piston barrel into a front cavity and a rear cavity; a check valve which is capable of communicating from the front cavity to the rear cavity is arranged on the piston; the water production pipe is communicated with the front cavity of the piston barrel; and a water outlet pipe which is externally connected with a water production pump and a gas supply pipe which is externally connected with a gas source are communicated with the rear cavity of the piston barrel. According to the membrane bioreactor, the gas-water separation device is arranged and the gas source is used as a power source of the backwashing, so that large-scale equipment such as a backwashing water pump is not used and thus the engineering cost and the water charge per ton are reduced. Practices prove that the rise of pressure is faster than that of the backwashing water pump, so that the membrane surface can be more effectively cleaned, the processing effect is good and the unit energy consumption is low.

Description

technical field [0001] The invention is used in the technical field of water purification treatment, and in particular relates to a membrane bioreactor. Background technique [0002] Membrane bioreactor (MembraneBioreactor-MBR) is an emerging water treatment technology, which is an organic combination of traditional sewage biological treatment process and membrane separation technology, and has been widely used in sewage treatment. The principle of membrane bioreactor is to use membrane separation technology to replace the secondary sedimentation tank in the traditional activated sludge method. Membrane bioreactors are generally composed of two parts: a membrane module and a bioreactor. According to the position of the membrane module, it can be divided into two types: separate type and integrated type. Among them, the integrated type is to install the membrane module and the bioreactor separately. The mixed solution of the bioreactor enters the membrane module after being ...

AI Technical Summary

Problems solved by technology

[0003] However, since the membrane surface of the integrated membrane bioreactor is in direct contact with the high-concentration activated sludge in the reactor, it is very easy to produce concentration polarization, resulting in pollution of the membrane surface; Backwashing, that is, the process of using product water as flushing water to flow out of the filter membrane from the product water side to the water inlet side under pressure conditions

However, the entire water backwashing process will consume a lot of energy, resulting in a high cost per ton of water treatment for membrane bioreactors, which restricts the development of membrane bioreactor technology

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