Domestic sewage zero emission treatment method and system

Abstract

The invention discloses a domestic sewage zero emission treatment method, which comprises the following steps of: (1) treating domestic sewage by the conventional treatment method; (2) performing advanced treatment on effluent obtained in the step (1) by using a reverse osmosis system to obtain reverse osmosis dialyzate and concentrated solution; (3) performing catalytic oxidation and biochemical treatment on the reverse osmosis concentrated solution successively; and (4) adding a flocculating agent into sludge produced in the step (1) and the step (3), making a mud cake and transporting. The domestic sewage is subjected to the conventional treatment, the effluent is subjected to advanced treatment by the reverse osmosis system, the reverse osmosis dialyzate of which the water quality can reach the standard of drinking water is used for daily life, and the further treated reverse osmosis concentrated solution of which the water quality can reach the water quality standard of non-drinking water is used for greening. The sewage can be fully utilized in a mode of treating the domestic sewage by stages, so that zero emission in the real sense is realized. The invention also discloses a domestic sewage zero emission treatment system.

Description

technical field [0001] The invention relates to a sewage treatment device, in particular to a zero-discharge treatment method and system for domestic sewage. Background technique [0002] In the daily life of living quarters, schools, office buildings and public places, a large amount of domestic sewage will be produced, such as daily sewage produced by hand washing, toilet flushing sewage produced by flushing toilets, etc. The usual treatment methods of these sewage are direct It is discharged into municipal sewage pipes and treated by municipal sewage treatment plants. In order to implement the country's strategic policies on resource conservation and environmental protection in a circular economy, some communities and buildings are equipped with sewage treatment devices to treat the sewage generated in the area, and the treated water can be used as green water. [0003] At present, the main processes of domestic sewage advanced treatment are: conventional biochemical tre...

AI Technical Summary

Problems solved by technology

However, since the water consumption for greening is not large, it only accounts for about 30% of the domestic sewage generated. In this way, even if all the domestic sewage is treated and reused, it cannot be fully utilized, and some sewage must be directly discharged.

That is to say, since the water quality of the existing domestic sewage treatment system can only meet the water quality standard of miscellaneous water, the occasions for reuse are limited, the utilization rate of reuse is not high, and the requirement of zero discharge cannot be met

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