Integrated sewage disposal system and disposal method

Abstract

The invention discloses an integrated sewage disposal system, comprising a pretreatment device, an anoxic tank, an anaerobic tank, an aerobic tank and a sedimentation tank all of which are orderly communicated with one another, and also comprises a sewage after-treatment device, a sludge treatment device and an oxygen supply device, wherein a sewage inlet is formed behind the pretreatment device; the sedimentation tank is provided with a sludge outlet facility and a water outlet end; the sludge outlet facility of the sedimentation tank is communicated with the feeding end of the sludge treatment device; the water outlet end of the sedimentation tank is communicated with the water inlet end of the sewage after-treatment device; a sludge return channel is arranged between the sedimentation tank and the anoxic tank; the anaerobic tank is connected with the oxygen supply device. In addition, the invention also provides an integrated sewage disposal method. According to the method, the sewage is desanded by the pretreatment device, then orderly enters into the anoxic tank, the anaerobic tank and the aerobic tank for biochemical treatment, and as a result, most of organic matters in the sewage can be removed thoroughly; next, the organic matters and suspended solids SS in the sewage can be removed through the sewage after-treatment device. The system is simple and compact, mature and stable in treatment effect, simple in operation management, low in investment and small in floor area.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to an integrated sewage treatment system and treatment method. Background technique [0002] At present, 80% of the urban sewage treatment plants in my country adopt the activated sludge process or other improved processes. The commonly used processes in urban sewage treatment plants include AAO, AO, SBR, CASS and oxidation ditch processes. [0003] The AAO process combines the traditional activated sludge process and biological nitrification process to effectively remove organic matter, nitrogen and phosphorus in sewage. The core arrangement of the AAO process is anaerobic, anoxic, aerobic, and precipitation (or pre-anoxic). Anaerobic in the front can make phosphorus-accumulating microorganisms preferentially obtain carbon sources and fully release phosphorus. Phosphorus accumulation under anaerobic conditions Bacteria convert organic matter into organic acids through cooperation am...

AI Technical Summary

Problems solved by technology

Disadvantages are: intermittent cycle operation, high control requirements, variable water level operation, increased power consumption, sludge stability is not as good as anaerobic nitrification

The disadvantages of oxidation ditch are: prone to sludge bulking problem, unstable operating flow rate, easy to produce dead cycle sedimentation sludge, long sludge age and easy aging of sludge

Disadvantages of CASS: intermittent cycle operation, high requirements for self-control; variable water level operation, increased power consumption

[0008] The above processes all have nitrogen and phosphorus removal, high organic matter removal rate, mature and stable process, simple operation and management, but their process principles and characteristics are different or have shortcomings

The treatment structures are scattered, occupying a lot of land and investing a lot. Now the state stipulates that the effluent of newly launched urban sewage treatment projects must implement the first-level A standard in the "Pollution Discharge Standards for Urban Domestic Sewage Treatment Plants" (GB18918-2002), but there is no such standard in reality. A practical, simple and compact process with stable treatment effects, simple management, and less investment and land occupation can meet the first-class A standard in the "Pollution Discharge Standards for Urban Domestic Sewage Treatment Plants" (GB18918-2002)

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