Sewage resourcesization treatment method

Abstract

The invention relates to the technical field of sewage treatment, in particular to a sewage resourcesization treatment method for sewage reuse water, liquid zero discharge and sewage resourcesization. According to the method, a chemical reaction sediment unit, an organic matter deep treatment unit and a membrane water regeneration unit are included, sewage is treated to obtain reuse water, concentrated water meeting the discharge standard and a small number of solid mud cakes; the sewage resourcesization treatment method is a low-consumption sustainable sewage regeneration method; a concentrated water deep treatment unit, a concentrated water resin processing unit, a film separation concentration unit, an evaporation separation and crystallization unit and a crystallization mother liquid drying unit are further included in the sewage resourcesization treatment method; the evaporation separation and crystallization unit comprises a plurality of evaporation crystallization devices, a plurality of thermal centrifugal separators, a plurality of cold centrifugal separators and a crystallization mother liquid spray dryer; the concentrated water treated in the membrane water regeneration unit is separated to obtain reuse water, sodium chloride, sodium sulfate, potassium chloride and a small amount of carnallite solid waste. By means of the method, sewage resourcesizaiton is achieved, and long-time stable operation can be achieved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, and relates to a liquid zero-discharge method for obtaining regenerated water from sewage treatment and separating main salt crystals in the water. technical background [0002] With the intensification of human economic activities, water resources will become the bottleneck of economic development. Therefore, in more and more cases, it is necessary to regenerate sewage into reclaimed water that can replace raw water; in some cases, it is necessary to achieve zero liquid discharge. [0003] The common reclaimed water technology is to treat the sewage after traditional biochemical treatment or other sewage with low organic pollution, including flocculation, ultrafiltration, and reverse osmosis treatment. At present, the main problem is that the organic pollutants in the water are not treated thoroughly before entering the membrane system. Pollutants are still at a high level, reverse osm...

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Problems solved by technology

[0005] The invention aims to solve the technical problem of frequent reverse osmosis cleaning in reclaimed water technology, and the reverse osmosis concentrated water cannot meet the discharge standard; the reverse osmosis membrane needs frequent chemical cleaning in the liquid zero discharge sewage treatment method, and the operation of concentrated water evaporation crystallization is difficult, and the obtained evaporation crystallization is A large amount of mixture of miscellaneous salts and organic pollutants, the crystallization mother liquor cannot be effectively treated, and the technical problem that the whole system is difficult to operate stably for a long time

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