Energy-saving MBR (membrane bioreactor) sewage treatment system

Abstract

The invention discloses an energy-saving MBR (membrane bioreactor) sewage treatment system. The system comprises a regulating tank, a pretreatment tank and a MBR treatment tank with a built-in MBR, which sequentially communicate with each other, wherein an aeration device is respectively arranged in the pretreatment tank and the MBR treatment tank, and is matched with a fan; a first liquid level sensor and a first water pump for transferring sewage to the pretreatment tank are arranged in the regulating tank; a second liquid level sensor and a second water pump for transferring sewage to the MBR treatment tank are arranged in the pretreatment tank; a third liquid level sensor is arranged in the MBR treatment tank; an water outlet of the MBR treatment tank is connected with a third water pump; the first water pump is controlled by composite signals of the first liquid level sensor and the second liquid level sensor; the second water pump and the fans are controlled by composite signals of the second liquid level sensor and the third liquid level sensor; and the third water pump is controlled by the third liquid level sensor. Different power modes are set corresponding to different liquid levels of the fans and water pumps, thereby obviously enhancing the energy-saving effect.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an energy-saving MBR sewage treatment system. Background technique [0002] Membrane bioreactor (MBR) technology is a kind of membrane sewage treatment technology. In recent years, MBR technology has been more and more widely used, but its energy consumption is still relatively high, and later maintenance and management are also a big problem. To some extent, its application is limited. [0003] The Chinese patent document with the publication number CN104609678A discloses an intelligent sewage treatment system. A pressure transmitter connected to an automatic control system is installed on the water production pipe. The automatic control system is operated by the pressure transmitter or according to the intelligent sewage treatment The running time of the system can automatically control the switch of the water inlet valve, water production valve, backwash valve, sludge discharg...

AI Technical Summary

Problems solved by technology

[0008] However, there is still room for improvement in the energy-saving performance of fans and pumps, and the sewage flow parameters used as the basis for the control strategy cannot accurately and comprehensively represent the working status of the sewage treatment system

Especially in the existing MBR sewage treatment system, most of the control of the material transfer pump and the aeration fan is to collect the flow signal for frequency conversion control, but the sewage composition is complex, especially when the sewage is entrained with fixed objects, the flow detection element may There will be signal errors. In addition, the flow rate is not very stable when the sewage flows. Too frequent changes in the frequency conversion control signal may also cause hidden dangers on the equipment.

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