Method for reducing amount of sludge of improved sewage factory and performing low-carbon-consumption denitrification

Abstract

The invention provides a treatment device and method for reducing the amount of sludge of an improved sewage factory and performing low-carbon-consumption denitrification. A raw water tank in the treatment device is connected with water injection ends of an A / O nitration reactor, a secondary sedimentation tank, a middle water tank and an anaerobic fermentation synchronous low-carbon denitrification reactor sequentially; and the sludge discharging end of the secondary sedimentation tank is connected with the sludge injection ends of the A / O nitration reactor and a sludge storage tank respectively. The treatment method comprises the following steps: the raw sewage firstly enters the A / O nitration reactor to be subjected to short-cut nitrification, and then enters the anaerobic fermentation synchronous low-carbon denitrification reactor together with residual sludge, so that fermentation for residual sludge, heterotrophic denitrification for nitration liquid and autotrophic nitrogen removal of anaerobic ammonia oxidation are realized synchronously; the residual sludge enters the anaerobic fermentation synchronous low-carbon denitrification reactor to be subjected to anaerobic fermentation and reduction. The treatment device and method are suitable for high ammonia-nitrogen sewage treatment; and furthermore, deep low-carbon-consumption denitrification for the sewage is realized, and the yield of the residual sludge in a sewage biological denitrification system is reduced.

Description

technical field [0001] The invention relates to the technical field of sewage sludge biological treatment, in particular to a method for strengthening sewage plant sludge reduction and low-carbon denitrification. Background technique [0002] The vast majority of urban sewage in my country, especially industrial wastewater with high ammonia nitrogen concentration, has a serious shortage of carbon sources. Its own carbon sources cannot meet the needs of denitrification at all, and the lack of carbon sources has caused the total nitrogen of sewage biological treatment to fail to meet the standard. The key reason is that the existing domestic sewage biological treatment system often supplements the carbon source demand by adding methanol and other external carbon sources, which not only increases the treatment cost, but also exacerbates the CO of the water plant. 2 Discharge and residual sludge production. [0003] In addition, due to the large output of excess sludge in the s...

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Problems solved by technology

[0003] In addition, due to the large amount of residual sludge produced by the sewage biological treatment system, the treatment cost is high. For a typical urban sewage treatment system, the sludge treatment cost is high It accounts for about 40% of the total cost, and the treatment and disposal of excess sludge is likely to cause secondary release of nutrients and secondary pollution

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