City watercourse drain outlet sewage treatment method and device

Abstract

The invention relates to a city watercourse drain outlet sewage treatment method. The method mainly comprise the steps of regulation, wherein sewage is introduced into a regulating reservoir for regulation; mixing with flocculant, wherein sewage in the regulating reservoir is led out to be mixed with flocculant; flocculent settling, wherein sewage mixed with flocculant is sequentially introduced into a baffle flocculation reaction tank and a settling tank for sewage flocculation and sludge precipitation separation; denitrification, wherein water discharged from the settling tank and part of water discharged from a nitration aerating filter are introduced into a denitrification filter for denitrification; aerobiotic nitration, wherein water discharged from the denitrification filter is introduced into a nitration aerating filter for nitration; filtration, wherein part of water discharged from the nitration aerating filter is introduced into a filtering device for filtration. The invention further provides a sewage treatment device adopting the method. The sewage treatment device comprises a regulating reservoir, a pipeline mixer, a baffle flocculation reaction tank, an oblique plate settling tank, a denitrification filter, a nitration aerating filter and a clear water pond which are connected in series, wherein a water outlet pipeline of the clear water pond is connected to a filter device.

Description

technical field [0001] The invention relates to a method and equipment for treating sewage at sewage outlets of urban rivers, which are mainly suitable for sewage treatment at sewage outlets of rivers for discharging domestic sewage and other similar sewage. Background technique [0002] The sewage treatment method at urban river mouths is largely a solid-liquid separation technology. The existing sewage treatment methods generally use aerated grit chambers (the most common mixed reaction tanks) and primary sedimentation tanks to remove Suspended and colloidal substances, and then the sewage undergoes various purification functions such as physical and biological metabolism, so as to meet the requirements of sewage discharge. [0003] But there are many weak points in existing sewage treatment method: [0004] First of all, commonly used mixing reaction tanks, primary sedimentation tanks and other water treatment units have long residence time, low hydraulic load, high init...

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Problems solved by technology

[0004] First of all, commonly used mixing reaction tanks, primary sedimentation tanks and other water treatment units have long residence time, low hydraulic load, high initial construction investment, and large floor space.

In addition, while removing suspended solids, the concentration of organic matter in sewage often also decreases. When the treatment of suspended solids in sewage is too high, COD cr If the removal amount is too high, the carbon source for nitrate nitrogen in the subsequent denitrification process will be reduced, and denitrification will be inhibited, so that an additional carbon source will be required and equipment costs will be increased; if the treatment level of suspended solids is too low, it will cause subsequent denitrification The biofilter is clogged too quickly or requires frequent backwashing

[0005] Secondly, the post-denitrification process is generally adopted in the biological aerated filter. The management of the post-denitrification is complicated and the operation cost is high. The influent water needs to be pretreated, otherwise a large amount of impurities and SS in the raw water will enter the aeration filter, which will block the aeration and water distribution system, which will bring serious consequences to the operation of the system

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