Leachate system based on domestic sewage and treatment process of system

Abstract

The invention discloses a leachate system based on domestic sewage. The system comprises a pretreatment area, a pretreatment tank and a sludge treatment device; the pretreatment tank comprises a grating desilting basin, an oil separation tank, a sewage tank, a sludge tank and a clean water basin which are connected in sequence; the pretreatment area comprises a demulsification reactor, an electro-Fenton reactor, a coagulation reactor and a sewage filter; the demulsification reactor comprises a stirring machine and a shearing dispersion disc, and the shearing dispersion disc is connected with the stirring machine through a stirring shaft and is driven by the stirring machine to rotate; and the electro-Fenton reactor comprises an anode iron plate and a cathode graphite plate which are oppositely arranged. The invention further discloses a purification process method adopting the leachate system. The sewage treatment facility disclosed by the invention has relatively high flexibility and adjustability in operation so as to adapt to the change of water quality and water quantity. Meanwhile, by means of the nine-stage sewage treatment process, the set purification requirement can be met, the occupied space of water storage and equipment is effectively reduced in cooperation with corresponding equipment, and the whole device can be reduced to be in the size of a container.

Description

technical field [0001] The invention relates to the field of environmental equipment, in particular to the filtration treatment of domestic sewage. Background technique [0002] The waste transfer station mainly contains domestic waste, kitchen waste, kitchen waste, and a small amount of industrial waste. Since the waste is mainly composed of domestic waste, this kind of leachate sewage has the characteristics of high COD, high ammonia nitrogen, and high suspended matter, especially COD and BOD 5 The concentration is very high, which is a high concentration load compared with general sewage, and multi-stage physical and chemical pretreatment is required to reduce its concentration. At present, domestic and foreign counterparts have not developed treatment equipment for landfill leachate in a targeted manner, and most of them have used or modified landfill leachate treatment equipment, and generally adopt pretreatment + biochemical treatment processes. Compared with other t...

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Problems solved by technology

Compared with other treatment processes, this treatment process combination has a very significant operating cost advantage, but the disadvantage of this treatment process is that the hydraulic retention time is long, and it is necessary to build civil facilities for large-capacity storage of sewage, and the area occupied by such sewage treatment facilities will be large. Very large, most medium-sized transfer stations and all small stations cannot meet

Considering that the small and medium-sized garbage compression station itself occupies a small area, it is impossible to reserve enough land for the civil engineering facilities of the biochemical treatment process (the biochemical process must build grid tanks, grit chambers, primary sedimentation tanks, secondary sedimentation tanks, reaction tanks, Acidification hydrolysis tank and other civil construction facilities, and the hydraulic retention time is long, which requires more supporting civil construction facilities), and the operation and operation of the biochemical method is relatively cumbersome (need to cultivate and domesticate the microorganisms for sewage treatment, and need to feed nutrients to the microorganisms every 6 hours, The requirements for the qualifications of the operators are very high, the biochemical process must be pretreated, and the untreated sewage is easy to kill microorganisms, and the sewage treatment effect is poor)

In addition, this process takes a long time to process, requires high influent water quality, and effluent water quality fluctuates greatly, so it is not suitable for the complex leachate sewage of garbage transfer stations.

Furthermore, for the impact load of water quality in the process of sewage treatment and the specific local climate factors, due to the need for a relatively constant external environment in the process of biochemical treatment, resulting in difficulties in biochemical process treatment

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