Sewage purifying method

Abstract

The invention relates to a water treatment method, and particularly relates to a sewage purifying method. The sewage purifying method includes steps of (1), pretreatment: pre-treating sewage, and removing suspends / floats and impurities in the sewage; (2), vortex micro-flocculation treatment: adding coagulant in the water acquired through pretreatment or adding coagulant and coagulant aids, performing vortex micro-flocculation treatment; (3), microfiltration: micro-filtering water body acquired through vortex micro-flocculation treatment, intercepting particles of which grain diameter is more than 10 miu m in the water body; acquiring the purified water and sewage. The sewage purifying method is short in water retention time, and high in handling efficiency, sewage removal rate and outer producing rate.

Description

Technical field [0001] The invention relates to a water treatment method, in particular to a sewage purification method. Background technique [0002] China's regional river networks are well developed and the topography is complex. There are problems such as the dispersion of sewage in some areas and the difficulty of collecting and controlling many scattered sewage outlets by bypassing. In particular, rural sewage and rural domestic sewage are roughly discharged. 96% of villages do not have drainage channels and sewage treatment systems. Production and domestic sewage are discharged at will. The sewage is discharged directly to nearby water bodies along road ditches or routes, which causes pollution in the surrounding watersheds of the countryside. For water bodies such as bypass sewage that cannot be intercepted, rural domestic sewage, and rivers that need emergency treatment, traditional sewage treatment technology mainly adopts the coagulation-sedimentation-filtration proces...

AI Technical Summary

Problems solved by technology

[0002] The river network in various regions of China is well developed, the terrain is complex, there are problems such as scattered river sewage in some areas, and many scattered sewage outlets in bypasses, which are difficult to collect and control.

Especially rural sewage, rural domestic sewage is roughly discharged, 96% of villages do not have drainage channels and sewage treatment systems, production and domestic sewage are discharged randomly, and sewage is discharged directly to nearby water bodies along road side ditches or routes, resulting in pollution of surrounding rural watersheds and other problems

For water bodies such as bypass sewage that cannot be intercepted, rural domestic sewage, and river courses that need emergency treatment, the traditional sewage treatment technology mainly adopts the coagulation-sedimentation-filtration process, which has low coagulation and filtration effects and occupies a large area. The hydraulic retention time (HRT) is long, which will cause the following defects: (1) The treatment efficiency is low, and the load of the sedimentation tank is 4-8m 3 / (m 2 h), the treatment efficiency of the filtration system is 8-10m 3 m 2 / h; (2) Long hydraulic retention time, up to 30-60min; (3) Large area, 10000t / d processing capacity, covering an area of ​​800-1000m 2 , low water production rate, only about 95%

[0003] In the prior art, coagulation is carried out first, and then supermagnetic separation is used for sewage treatment. The hydraulic retention time (HRT) of coagulation in this treatment technology is relatively short, and the power consumption of supermagnetic separation is high.

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