Technique for deeply purifying urban sewage

Abstract

The invention discloses a technique for deeply purifying urban sewage. The technique comprises the following steps: (1) treating the sewage with regulating reservoir, and then putting into an anaerobic tank, an anoxia pool and an aerobiotic pool and performing biochemical treatment, thereby obtaining the purified water A; respectively maintaining sewage in the anaerobic tank, the anoxia pool and the aerobiotic pool for 2.5-3.5h, 5.5-6.5h and 11-13h; controlling the dissolved oxygen concentration in the anoxia pool and the aerobiotic pool at 0.25-0.4mg / L and 0.5-1.0mg / L; filling suspended filler into the aerobiotic pool, wherein the filling volume of the suspended filler is 65-75% of the volume of the aerobiotic pool; (2) putting the purified water A into a nitration settling pond for performing nitration settling treatment, thereby obtaining purified water B and nitrified sludge; returning the nitrified sludge to the regulating reservoir by a gas stripping system through a nitrified sludge return pipe; (3) purifying the purified water B with a deep bed filter chamber, thereby finishing deep purification for urban sewage. According to the technique, the organisms can be doubled, the treating effect can be increased, the tank volume can be reduced and the purifying technical equipment is simple in structure and reliable in process flow.

Description

technical field [0001] The invention relates to a deep purification process of urban sewage, which belongs to the technical field of sewage treatment. Background technique [0002] With the acceleration of urbanization, the population of villages and towns continues to concentrate, township enterprises develop rapidly, and the discharge of urban sewage continues to increase, while the construction of urban infrastructure is far behind and the development of urban construction, lacking necessary sewage collection systems and sewage treatment facilities, sewage The disordered and turbulent flow not only directly pollutes the ecological environment of the small town itself, but also causes serious pollution of the surrounding rivers and lakes. According to relevant reports, more than 70% of domestic sewage in my country will come from towns and communities, and the water pollution area of ​​small towns is quite large. [0003] At present, in the sewage treatment technology, th...

AI Technical Summary

Problems solved by technology

However, for the sewage treatment and deep purification of small towns in my country, it is difficult to meet the characteristics of small town sewage with small hydraulic power, large hydraulic changes, complex water quality fluctuations, and poor infrastructure conditions.

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