Domestic sewage treatment system

Abstract

The invention relates to the technical field of sewage treatment, in particular to a primary treatment system for domestic sewage, which includes a coarse grid assembly and a fine grid assembly sequentially connected together, and the primary treatment system also includes a first fluidized bed separation device, collector, shape coalescer, oil storage tank, the fine grid assembly is connected with the first ebullated bed separator, the first ebullient bed separator is connected with shape coalescer, collector, the oil storage tank is connected with the shape The coalescer is connected. The invention completes the removal of sand particles and organic matter emulsified oil only through the first fluidized bed separator and shape coalescer, and no longer needs to build aeration grit chambers and aeration devices, which significantly reduces the land occupation of the primary treatment system Area and cost; the first fluidized bed separator is also more convenient to operate and use, with a simpler structure, and will not produce a large amount of malodorous gas during the treatment process, which improves the clean environment.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a domestic sewage treatment system. Background technique [0002] Urban domestic sewage is collected by the urban pipe network system and transported to the sewage treatment plant, where it is treated. At present, the 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 is a coarse grid assembly, fine grid assembly, and aeration grit chamber connected in sequence; the secondary treatment system is a biochemical tank and a sedimentation tank connected in sequence, and the biochemical pool is connected to the aeration grit chamber , the sedimentation tank is connected with the advanced treatment system; the advanced treatment system is a coagulation sedimentation tank and a disinfection tank connected in sequence....

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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