Sewage treatment method

Abstract

The invention provides a sewage treatment method which comprises steps as follows: a sewage blockage grid traps large suspended substances or floating substances in sewage, and a regulating tank regulates the water quantity and water quality of the sewage and performs preliminary precipitation; the sewage and aerobic zone reflux mixed liquor together pass through an anoxic zone to perform denitrification treatment, and pass through an aerobic zone to remove organic substances in the sewage, and the mixed liquor of the aerobic zone flows back to the anoxic zone through air stripping; and phosphorus is removed from the residual sewage after air stripping by adding an aluminum salt with a preset concentration and adopting a mixed feed zone using perforated aeration stirring, and the sewage which has passed through the mixed feed zone passes through a settling zone to perform sludge-water separation. The invention can simultaneously remove nitrogen and phosphorus in the sewage and implement low sludge yield; and the invention has the characteristic of small occupied area, is simple top operate and maintain, conforms to the requirements of the countryside for technical rationality and economical efficiency, and has wide application prospects.

Description

technical field [0001] The invention relates to a sewage treatment method, which belongs to the technical field of sewage treatment. Background technique [0002] Due to the relatively backward infrastructure construction in rural areas, the collection and treatment rates of rural sewage are quite low. At present, most rural areas do not have drainage collection facilities and sewage treatment systems, and production and domestic sewage are discharged at will. The current situation of rural sewage treatment is different from that of cities, mainly in the following aspects: (1) The rural population is small, widely distributed and scattered, the rural water consumption standard is low, the sewage flow rate is small and the daily variation coefficient is large; (2) The sewage composition The concentration is low, and it is mainly composed of organic matter, nitrogen and phosphorus, and the water quality fluctuates greatly; (3) Villages and towns lack professional and technica...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems that the process rationality and economy do not meet the needs of the countryside in the existing rural sewage treatment technology, so that the effluent does not meet the standard or only part of the indicators are qualified, and the process operation and maintenance are difficult and the sludge output is high. , and then provides a sewage treatment method

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