System and operating method for treating rubbish leachate and urban household sewage in combined way

Abstract

The invention discloses a system and an operating method for treating rubbish leachate and urban household sewage in a combined way. The system comprises a rubbish leachate pretreatment unit and a mixed sewage biological treatment unit, wherein rubbish leachate enters the rubbish leachate treatment unit firstly, drained water is mixed with urban household sewage, the mixture enters the biological treatment unit, and drained water treated by the biological treatment unit is discharged after reaching the standard; the rubbish leachate pretreatment unit is an electrochemical reactor which is mainly used for pretreating rubbish leachate and removing a part of ammonia nitrogen and toxic and harmful substances contained in the rubbish leachate; and the mixed sewage biological treatment unit is a membrane aeration bioreactor (MABR) which is suitable for treating sewage of low COD (Chemical Oxygen Demand) / NH<3->N and is mainly used for removing organic matters and denitrifying. The system and the operating method are suitable for treating waste water, such as rubbish leachate and the like with high ammonia-nitrogen ratio and low ammonia-nitrogen ratio.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment in environmental engineering, and in particular relates to a system and an operation method for combined treatment of landfill leachate and urban domestic sewage. Background technique [0002] In 2008, 223.037 million tons of municipal solid waste and feces were collected and transported nationwide, with an average annual growth rate of about 6.5%, of which about 80% were disposed of by sanitary landfill. However, a large amount of highly polluted landfill leachate with special properties will be produced in the process of sanitary landfill. With the country's increasing emphasis on the environment and the improvement of water quality standards, its treatment is also more urgent, but the investment and operating costs of its separate treatment are relatively high. In small and medium-sized cities and towns in my country, in order to reduce their treatment costs, landfill leachate is ofte...

AI Technical Summary

Problems solved by technology

[0005] One of the objectives of the present invention is to provide a system for the combined treatment of landfill leachate and urban domestic sewage that has problems such as high ammonia nitrogen content in landfill leachate and low COD / TN during biochemical treatment, so as to solve the problem of landfill leachate being directly discharged into the city The ammonia nitrogen concentration is too high in the domestic sewage treatment plant and the total nitrogen in the effluent of the sewage treatment plant exceeds the standard

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