Aerobic and anaerobic VBBR series coupling device and sewage treatment method

Abstract

The invention relates to a series coupling type sewage treatment device, which comprises an anaerobic reactor and an aerobic reactor. The anaerobic reactor is a baffling-type inner circulation bioreactor, and a water inlet is formed in the anaerobic reactor; the aerobic reactor is a baffling-type inner circulation bioreactor, and a water outlet is formed in the aerobic reactor; a connecting pipe is connected between the anaerobic reactor and the aerobic reactor; and a flow returning pipe is connected between the anaerobic reactor and the aerobic reactor, and the flow of a fluid returning in the flow returning pipe is 1.5-3 times of the flow of inflowing water in the water inlet. The series coupling type sewage treatment device is similar to an existing sewage treatment technology adoptingan A / O or A2 / O method, a denitrification reaction is achieved through organic carbon sources in the inflowing water, but compared with a traditional A / O or A2 / O process, no sludge is contained in circulating liquid, it can be guaranteed that denitrification bacteria and nitration bacteria in the anaerobic reactor and the aerobic reactor are not disturbed, and a stable microbial flora is maintained. Through series coupling of the two reactors, the sewage treatment effect is much higher than the sewage treatment effect achieved by the traditional A / O or A2 / O process.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an aerobic and anaerobic VBBR series coupling device and a sewage treatment method. Background technique [0002] At present, most of the treatment processes in urban domestic sewage treatment plants at home and abroad adopt the activated sludge process. The main function of activated sludge treatment of domestic sewage is to remove organic matter (usually COD or BOD) in domestic sewage 5 as an indicator), and more importantly, the main purpose is to remove nitrogen and phosphorus. After more than 100 years of development, the technology and process of activated sludge treatment of domestic sewage have made great progress. At present, most of the municipal sewage treatment plants at home and abroad still use A 2 / O craft-based. A 2 / O process is the English abbreviation of Anaeroxic-Anoxic-Oxic. The biggest feature of this process is that it integrates traditional activated ...

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Problems solved by technology

However, it can be seen from the above-mentioned process that this process also has some obvious shortcomings: (1) from the aerobic pool to the mixed solution of the anoxic pool through internal backflow, except for the nitrate nitrogen backflow to the anoxic or anaerobic pool In addition to the oxygen tank, a large amount of sludge containing nitrifying bacteria also flows back to the anoxic or anaerobic tank, which leads to a decrease in the relative concentration or abundance of denitrifying bacteria in the anoxic or anaerobic tank, thereby affecting the denitrification efficiency; (2 )Usually domestic sewage contains multiple components. In the biological treatment system, the removal of pollutants is usually degraded through certain procedures or steps (Procedural biodegradation)

but in A 2 In the / O process, due to the continuous migration of a large amount of activated sludge due to internal circulation and backflow, the microbial community is always changing, which may lead to a decrease in biodegradation efficiency; (3) traditional anaerobic tanks and anoxic The pool is an open system. Due to the agitation of the flow impeller, the oxygen in the air will inevitably enter the liquid in the anaerobic pool or the anoxic pool, resulting in an increase in the dissolved oxygen concentration. Therefore, a considerable part of the electrons provided by the organic carbon source is consumed in the dissolution process. Oxygen, often insufficient carbon source

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