Low-energy-consumption membrane bioreactor and sewage treatment method

Abstract

The invention discloses a low-energy-consumption membrane bioreactor (LEMB), and relates to the technical field of sewage treatment. The low-energy-consumption membrane bioreactor comprises at least one reaction channel, at least one membrane pool A and at least one membrane pool B. The reaction channels are connected with the bottom of the membrane pool A and the bottom of the membrane pool B. The middle of the membrane pool A and the middle of the membrane pool B are each provided with at least one membrane assembly, and the bottom of the membrane pool A and the bottom of the membrane pool B are each provided with an aeration device. During running, aeration is conducted on the membrane pool A, no aeration is conducted on the membrane pool B, and gas-lifted water flow sequentially flows through the membrane pool A, the membrane pool B, the reaction channels and the membrane pool A so that gas-lifted circulating can be achieved multiple times; dissolved oxygen is provided for the reaction channels through aeration of the membrane pool, and the aerobic environment, the oxygen-deficient environment and even the anaerobic environment sequentially exist in the reaction channels; aeration is alternately conducted on the membrane pool A and the membrane pool B regularly so that bidirectional flushing of membranes and flow direction conversion of a reaction area can be achieved. The membrane gas flushing aeration amount is reduced by 50%, the biochemical aeration amount is reduced by 70-100%, the energy consumption of a liquid circulating pump is lowered by 100%, and the energy conservation effect is remarkable.

Description

technical field [0001] The invention relates to the technical field of membrane filtration and sewage treatment, in particular to a low energy consumption membrane bioreactor and a sewage treatment method. technical background [0002] Human activities in recent decades have caused catastrophic pollution to the earth's environment. Human beings need to reduce and clean up these pollutions in the next few decades. Among them, water pollution is one of the most important problems. Innovative wastewater treatment technologies are particularly important in efforts to reduce and clean up water pollution. [0003] Combining membrane filtration with activated sludge wastewater treatment has resulted in membrane bioreactor (MBR) technology. So far only the combination of activated sludge method and membrane filtration has been widely used. Compared with the traditional aerobic activated sludge method, the aerobic MBR sewage treatment technology has higher tank volume efficiency ...

AI Technical Summary

Problems solved by technology

This device saves about 50% of the membrane gas flushing energy consumption, but the membrane gas flushing kinetic energy is consumed in the membrane tank

This technical solution does not solve the coupling between the membrane tank and the biochemical reaction tank, does not make full use of the oxygen in the membrane flushing aeration, and still requires the energy consumption of biochemical aeration and liquid circulation pumps

Images