Biological sludge zero-discharge sewage treatment plant and method

Abstract

The invention provides a biological sludge zero-discharge sewage treatment plant and method embedded with an activated sludge / inorganic sand separator. The plant comprises an OSA sludge reduction main body composed of an aeration tank, a secondary sedimentation tank and an anaerobic uncoupling tank, wherein an activated sludge / inorganic sand separator is embedded in a return sludge pipeline; the bottom of the anaerobic uncoupling tank is connected with a feed port of the biological sludge / inorganic sand separator through a return sludge pipe; an overflow sludge discharge port of the biological sludge / inorganic sand separator is connected with an inlet end of the aeration tank through a return sludge pipe; and an underflow opening of the biological sludge / inorganic sand separator discharges surplus sludge through a sludge pipe. The plant and method can enhance the sludge reduction effect, and the discharged surplus sludge uses the inorganic sand instead of the activated sludge, thereby effectively implementing biological sludge zero discharge of the sewage treatment system, avoiding the secondary pollution of the activated sludge and lowering the sewage / sludge treatment cost.

Description

technical field [0001] The invention relates to sewage treatment and sludge reduction technology, in particular to a technology for realizing zero discharge of organic biological sludge by embedding activated sludge and inorganic sand separators on the return sludge pipeline of the sludge reduction process. Background technique [0002] With the growth of urban sewage production and the improvement of treatment rate, the amount of residual sludge as a by-product of sewage treatment will inevitably increase significantly. How to economically, effectively and safely dispose of a large amount of sludge generated continuously has become an urgent problem in the field of sewage treatment. In this context, various sludge source reduction technologies aimed at reducing the amount of residual sludge in sewage plants have emerged, especially based on reducing the synthesis of bacterial cells, strengthening the recessive growth of microorganisms, and utilizing micro-animals. The stud...

AI Technical Summary

Problems solved by technology

But so far, by comparing various sludge reduction technologies that have been developed, it can be found that each technology has various disadvantages, the most difficult of which is that with the reduction of excess sludge production, aeration The ratio of VSS / MLSS in the sludge in the pool decreases and the accumulation of inorganic substances increases, which reduces the reaction efficiency of the aeration tank, affects the sewage treatment of the system and the effect of sludge reduction, and also increases the wear and tear of sewage treatment equipment, affecting sewage treatment. and the normal operation of the sludge reduction system

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