Biological nitrogen removal combination device

Abstract

The invention provides a biological nitrogen removal combination device. The biological nitrogen removal combination device comprises a water inflow water tank, an oxygen-poor denitrification tank, an aerobiotic nitrification tank, a middle settling tank and an autotroph nitrogen removal tank, all of which are sequentially connected. The device has the effects that by the adoption of the device, part of organic matter having the adverse effect on anaerobic ammonium oxidation bacteria can be consumed, meanwhile, nitrate nitrogen generated in the autotroph nitrogen removal tank is removed, the overall nitrogen removal effect of a system is improved, and the total nitrogen removal rate is increased to 90%-97% from 80%-85%. The oxygen consumption of the autotroph nitrogen removal tank during oxidation of ammonia and nitrogen is reduced by 80%-95%, aeration intensity is reduced accordingly, and the influences of DO on the anaerobic ammonium oxidation bacteria are lowered. The content and activity of the anaerobic ammonium oxidation bacteria and ammonia oxidizing bacteria in sludge of the autotroph nitrogen removal tank are improved. The nitrogen volume removal load rate of the device can reach 2.5-10 kg / (m<3>.d), gas-solid-liquid three-phase separation is completed in one reactor, no settling tank needs to be independently arranged, and reactor units are reduced.

Description

technical field [0001] The invention belongs to the technical field of biochemical wastewater treatment, and in particular relates to a treatment device for nitrogen-containing organic wastewater. Background technique [0002] With the development of industry and agriculture, the rapidly concentrated urban population and the continuous improvement of the living standards of residents, a large number of nitrogen-containing compounds are discharged into the water environment, causing serious water nitrogen pollution. Among the main pollution indicators of my country's water environment in recent years, ammonia nitrogen has become the most important pollutant in water nitrogen pollution, and it is also one of the extremely important pollutants in water pollution. Due to the cost-effective advantages of biochemical methods, biochemical methods are widely used in practice. At present, the commonly used biological nitrogen removal methods mainly include aerobic nitrification / anox...

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Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a biological denitrification combined device, which is beneficial to reduce and remove the influence of organic matter and suspended matter in wastewater on anammox bacteria, and solves the problem of anammox treatment The problem of excessive nitrate content in the effluent of the device

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