Primary treatment system for domestic sewage

Abstract

The invention relates to the technical field of sewage treatment, in particular to a primary treatment system for domestic sewage. The primary treatment system comprises a thick grille assembly and afine grille assembly which are sequentially connected together, and further comprises a first fluidized bed separator, a collector, a shape coalescer and an oil storage tank; and the fine grille assembly is connected with the first fluidized bed separator, the first fluidized bed separator is connected with the shape coalescer and the collector, and the oil storage tank is connected with the shapecoalescer. Grit and organic matter emulsified oil are removed only through the first fluidized bed separator and the shape coalescer, thus an aeration grit chamber and an aeration device do not needto be built any more, the occupied area of the primary treatment system is significantly decreased, and the cost of the primary treatment system is significantly lowered; and the first fluidized bed separator is also more convenient to operate and use, the structure is simpler, a large amount of foul gas is not generated in the treatment process, and thus the cleaning environment is improved.

Description

Technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a primary treatment system for domestic sewage. Background technique [0002] Urban domestic sewage is collected and transported to the sewage treatment plant by the urban pipe network system, and is treated in the sewage treatment plant. The current domestic sewage treatment system of the sewage treatment plant includes a primary treatment system, a secondary treatment system and an advanced treatment system connected in sequence. The primary treatment system consists of coarse grid components, fine grid components, and aeration grit chambers which are connected together in sequence; the secondary treatment system is a biochemical tank and sedimentation tank which are connected in sequence, and the biochemical tank is connected to the aeration grit chamber , The sedimentation tank is connected with the advanced treatment system; the advanced treatment system is a coagulatio...

AI Technical Summary

Problems solved by technology

However, in practical application, there are many problems in the aerated grit chamber, mainly including: 1. The structure of the aerated grit chamber occupies a large area, and the civil construction cost is large and the cost is high; 2. It is difficult to control the air volume adjustment of the aeration device. If it is too large, the removal rate of fine sand particles will be reduced, if it is too small, there will be no aeration grit effect, which is very inconvenient to operate and use; 3. The aeration grit chamber will generate a lot of malodorous gases, such as hydrogen sulfide, ammonia and sulfur-containing VOCs, etc. The cleaning environment is poor; 4. Only part of the organic oil can be removed, which will affect the subsequent treatment and reduce the sewage treatment effect

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