A sewage treatment method with adjustable nitrogen and phosphorus removal capacity

Abstract

The invention discloses a sewage treatment method capable of adjusting nitrogen and phosphorus removal capacity, belonging to the field of sewage treatment. The sewage of the present invention passes through the reaction tank and the secondary sedimentation tank in turn to realize enhanced nitrogen and phosphorus removal. When the operation mode beyond sludge is adopted, the total phosphorus removal rate is >90% or the effluent TP<1mg / L, ΔBOD / ΔTN<4, within the system The maximum flow flux in each area does not exceed 2.2Q, and the phosphorus content of the sludge in the return sludge is >4%. It has high-efficiency nitrogen and phosphorus removal, energy-saving and low-carbon operation, high load, and less land occupation. It can realize denitrification and phosphorus removal and TN removal. The efficiency is not limited by the reflux ratio, the control is simple, the operation and management are convenient, etc. The system of the present invention is composed of a reaction tank, a secondary settling tank and connecting pipelines. The reaction tank is sequentially composed of a pre-anoxic zone, an anaerobic zone, a middle sink zone, an aerobic nitrification zone, a denitrification zone, Aerobic decarbonization area, water outlet area, connecting pipelines include main water inlet pipe, branch water inlet pipe, water outlet pipe, sludge overflow pipe, sludge return pipe, excess sludge discharge pipe, etc., the process flow is simple.

Description

technical field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment method capable of adjusting nitrogen and phosphorus removal capacity. Background technique

[0002] Biochemical treatment of sewage is mostly based on the traditional mechanism of nitrogen and phosphorus removal. Nitrification process, including nitrification and denitrification; nitrification, that is, autotrophic nitrifying bacteria (AOB, NOB) under aerobic conditions, NH 4 + -N→NO 2 - -N→NO 2 - -N; denitrification, that is, denitrifying bacteria under anoxic conditions, with NO X - as electron acceptor, organic matter as electron donor, NO 3 - -N→NO 2 - -N→N 2 . The biological phosphorus removal process includes anaerobic phosphorus release, aerobic transitional phosphorus absorption, and discharge of excess sludge to achieve biological phosphorus removal; in the anaerobic process, phosphorus-accumulating bacteria absorb org...

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