Domestic sewage treatment system and method

Abstract

The invention provides a domestic sewage treatment system and method. The system comprises an active soil wetland subsystem, an active soil regeneration subsystem, a precipitation device, a nitrification liquid backflow subsystem connected between the active soil wetland subsystem and the active soil regeneration subsystem, and an active sludge backflow subsystem connected between the active soil wetland subsystem and the precipitation device, which are connected in sequence. Nitrified sewage generated in the active soil regeneration subsystem flows back to the active soil wetland subsystem, is subjected to denitrification treatment in the active soil wetland subsystem, and is purified and absorbed by plants and microorganisms in soil; generated sludge flows back to the active soil wetland subsystem, and nutrient elements such as nitrogen, phosphorus and organic matters are supplemented for wetland vegetation. According to the scheme, growth of wetland plants is facilitated, the survival rate of the wetland plants in winter is increased, and the problem of sludge disposition in an existing domestic sewage treatment system is solved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a domestic sewage treatment system and method. Background technique [0002] Domestic sewage generally includes human and animal feces and kitchen sewage. Rural domestic sewage also includes fertilizer and pesticide sewage, breeding sewage, etc. The pollutant components are mainly nitrogen, phosphorus and organic matter. [0003] The existing domestic sewage treatment system includes an anoxic pool, an aerobic pool, a sedimentation device and an artificial wetland connected in sequence. Among them, the aerobic pool is used for nitrifying the organic matter and nitrogen nutrients in the sewage, and the nitrified sewage produced is passed through the pipeline. Return to the anoxic pool for denitrification and nitrogen removal treatment, and then enter the sedimentation device for precipitation after being treated in the aerobic pool and the anoxic pool. The supernatant pro...

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Problems solved by technology

[0004] In the above-mentioned domestic sewage treatment system, the sewage is treated in the aerobic tank and the anoxic tank to remove most of the organic matter and nitrogen nutrient salts in the sewage, and then precipitated by the sedimentation device, the organic matter and nitrogen nutrient salts in the precipitated supernatant are The content is further reduced, and the sewage that finally enters the constructed wetland is difficult to ensure the nutrient intake of the plants in the constructed wetland, resulting in the lack of plant minerals in the existing constructed wetland, unstable root systems, and easy to wither or freeze to death in winter, resulting in the purification of sewage by the constructed wetland The capacity is reduced, and even the phenomenon of water quality rebound occurs

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