Two-stage backflow simultaneous nitrogen and phosphorus removal device and technology for denitrification phosphorus removal, shortcut nitrification and anaerobic ammonia oxidation of municipal sewage

Abstract

The invention discloses two-stage backflow simultaneous nitrogen and phosphorus removal device and technology for denitrification phosphorus removal, shortcut nitrification and anaerobic ammonia oxidation of municipal sewage, and belongs to the field of sewage treatment. Municipal sewage enters an anaerobic / anoxic reactor after passing through a regulating reservoir; phosphorus-accumulating bacteria finish storage and phosphorus release of polyhydroxybutyrate (PHB) by using inflow chemical oxygen demand (COD) under an anaerobic condition; phosphorus-rich supernatant enters inside a middle reservoir through a water decanter, and is injected into a moving bed membrane bioreactor by a lift pump after the water quantity is adjusted; autotrophic nitrogen removal of the shortcut nitrification and anaerobic ammonia oxidation is achieved by alternate operation of low-oxygen aeration and anoxic agitation; the processed effluent enters the anaerobic / anoxic reactor again under the action of a suction pump; denitrification phosphorus removal is achieved after phosphorus-accumulating sludge containing the PHB and autotrophic denitrification effluent containing nitrate nitrogen are mixed. Simultaneous nitrogen and phosphorus removal of low-carbon municipal sewage is achieved by using coupling of three functional microorganisms for denitrification phosphorus removal, shortcut nitrification and anaerobic ammonia oxidation, and the two-stage backflow simultaneous nitrogen and phosphorus removal device has the advantages of being high-efficiency and energy-efficient, stable to run, and low in sludge yield.

Description

technical field [0001] The invention relates to a two-stage reflux synchronous denitrification and dephosphorization process of urban sewage denitrification dephosphorization and short-range nitrification anaerobic ammonium oxidation, belonging to the field of sewage treatment. Background technique [0002] With the continuous development of sewage treatment technology, the object of sewage treatment has already changed from the traditional visible pollution of organic matter to the invisible pollution of nitrogen and phosphorus elements, and the role of organic matter in sewage has also changed from pollutants to carbon sources that can be used . However, the treatment process of traditional urban sewage plants often inevitably degrades organic matter in the aeration tank. Even the pre-denitrification process does not fully utilize the value of organic matter. [0003] In recent years, a number of new sewage biological denitrification and phosphorus removal processes have...

AI Technical Summary

Problems solved by technology

[0004]Traditional urban sewage treatment has problems such as high energy consumption and poor effluent stability. possible

However, in view of the reality of the low carbon-to-nitrogen ratio of urban sewage, in order to achieve efficient nitrogen and phosphorus removal effects, there are still some problems to be solved in their application.

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