OA up-and-down partition type membrane biological reaction sewage treatment system and method

Abstract

The invention provides an OA up-and-down partition type membrane biological reaction sewage treatment system and method. The sewage treatment system comprises a treatment tank, a filter membrane assembly, an upper-layer aeration device and a lower-layer aeration device. The upper layer of the treatment tank is an aerobic layer and the lower layer is an anaerobic layer. The aerobic layer and the anaerobic layer are arranged in an up-and-down partitioned manner, nitrogen in the sewage is converted into nitrate and nitrite through nitrobacteria treatment in the aerobic layer, and phosphorus is absorbed by bacteria. Then, the upper-layer sewage gradually enters the lower anaerobic layer to be subjected to denitrification reaction; nitrate and nitrite are converted into nitrogen through denitrification reaction, bacteria release phosphorus while denitrification is performed, free-state phosphine is in a considerable proportion in a lower-layer light shielding environment, and the nitrogen and the free-state phosphine are quickly discharged along with aeration at the bottom of the membrane pool so that the purposes of nitrogen and phosphorus removal in sewage treatment are achieved. After denitrification treatment, part of the sewage subjected to nitrogen and phosphorus removal enters a filter membrane assembly, clear water is obtained after sewage removal two-phase separation and discharged, and the remaining sewage enters the upper layer along with aeration flow to be subjected to the next circulation.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an OA upper and lower partition type membrane bioreaction sewage treatment system and method. Background technique [0002] Generally, the AO process adopted in the traditional small-scale domestic sewage treatment system is designed for the left and right partitions of the aerobic zone and the anaerobic zone. The anaerobic zone is first anaerobic and then the aerobic zone is aerated at the bottom of the aerobic zone. The aeration energy consumption is high, and the slag should be discharged regularly Phosphorus, the operating cost is high, and it cannot be operated automatically for a long time; while in the facultative anaerobic FMBR system, the macromolecular organic pollutants are gradually degraded into small molecular substances through facultative anaerobic bacteria, and finally converted into stable nitrogen, phosphine and water. of inorganic substances. Insuffi...

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Problems solved by technology

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects of high energy consumption, high slag discharge, high operating cost and low biochemical efficiency of the aerobic system in the prior art sewage treatment system

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