High-concentration activated sludge sewage disposal process

Abstract

The invention provides a novel technique of short-time deep nitrogen removal for the urban sewerage treatment, which aims at limitations of low concentration of activated sludge and high dissolved oxygen in an aerobic tank in the prior art. The technique adopts the anoxic-aerobic combined process, and the most obvious characteristics of technique parameters thereof are high concentration of activated sludge and low dissolved oxygen in the aerobic tank. The activated sludge with high concentration can obviously increase the number of microorganisms when processing polluted water, thereby obviously strengthening the biological treatment capacity, and the aerobic tank with low dissolved oxygen can markedly increase the activity and number of denitrifying bacteria and is favorable for the generation of simultaneous nitrification and denitrification, thereby obviously enhancing the nitrogen-removing effect. The technique has the functional effects that the process can reach extreme high total nitrogen-removing effects within a quite short hydraulic detention time, and can also remove ammonia nitrogen, total phosphorus and other pollutants effectively, and the treatment effect and economic performance reach the international leading level.

Description

technical field [0001] The invention relates to a sewage treatment process, which can be used for urban sewage treatment or similar industrial waste water treatment, has the characteristics of high concentration of activated sludge and low dissolved oxygen in an aerobic tank, and achieves the effect of deep nitrogen removal in a short time. Background technique [0002] The sludge concentration (MLSS) of the existing activated sludge process at home and abroad is generally around 3.5g / L. The MLSS of all activated sludge processes recommended by GB50014-2006 "Code for Outdoor Drainage Design" is below 6g / L, of which the nitrogen removal process MLE method and phosphorus and nitrogen removal process A 2 The MLSS of the O method is all 2.5-4.5g / L, which is much lower than the MLSS of the process of the present invention. [0003] Among the activated sludge methods recommended by GB 50014-2006 "Code for Design of Outdoor Drainage", only the MLSS of the adsorption regeneration a...

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Problems solved by technology

[0013] The dissolved oxygen in the aerobic zone of the existing municipal sewage activated sludge treatment process at home and abroad is higher than the process of the present invention, which is not conducive to the growth of denitrifying microorganisms, so its treatment effect is not as good as the process of the present invention, and the energy consumption and cost of treatment are high In the process of the present invention

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