Research On Theory And Technology Of Municipal Domestic Sewage Purification And Reuse

With the urbanization development quickening, shortage of water resource becomes increasingly serious in city; at the same time municipal domestic sewage drainage is becoming more and more, the increasingly serious water pollution reduces the use function of the water body, making the water resource contradiction of supply and demand more sharp. It has become the serious restricting-factor of economic and social sustainable development. The regeneration and reuse of the municipal domestic sewage is one effective way to develop resources and reduce expenditure, lighten the water pollution degree, solve shortage of water resource in the city. Aiming at the purification and reuse of municipal domestic sewage, this paper has carried out the research of theoretical technical aspect.(1) This paper analyzes the feasibility of municipal sewage reuse. Through the analysis, indicated that municipal sewage reuse is reliable, in the technology and the economy all is feasible, moreover it may bring the notable environment benefit; In the ways to alleviate municipal water shortage, municipal sewage reuse may open the second water source, it is easier implement and more economical than other ways.(2) Through analyzing the discharges situation and characteristic of municipal domestic sewage, it is discovered that municipal domestic sewage has become the major pollutive source of water body pollution; But the present pattern that municipal sewage is centralized to the terminal of drainage network to process do not adapt domestic sewage treatment and reuse, through contrasting the centralism treatment and the decentralized treatment, this paper has established the feasible pattern which purifies and reuses municipal domestic sewage in original site for the residential areas unit.(3) According to the characteristic of residential areas domestic sewage and the process requirement for purification and reuse, on the basis of comparing the traditional biological treatment process and advanced treatment method, this paper optimizes the method and designs new technique for residential areas domestic sewage purification and reuse. The process adopts compound coagulant that makes coagulation effect notable intensified. Meanwhile new patent technology is adopted, which improves on both the stuffing and aeration device of bio-contact oxidation method and the adsorption-infiltration device. The new process largely enhances the treatment efficiency and effluent quality, and it is worthy of popularizing and application.(4) Through the cases of analogical process, it is testified that the new process is feasible in practical engineering.