Sewage biological denitrogenation and sludge decrement coupling bioreactor and technique thereof

Abstract

The invention relates to a sewage bio-denitrification and sludge reduction coupling bioreactor and the process, pertaining to the sewage treatment field. Presently, 90 percent of sludge of China can not be effectively treated and disposed in due time, which results in secondary pollution. Moreover, the total nitrogen removal efficiency of a sewage treatment plant (particularly sewage with low carbon-nitrogen ratio) is poor as a whole. However, the carbon source discharged by reduction release of remained sludge can be acted as effective carbon source, thus enhancing denitrification effect while reducing the quantity of sludge. The invention is sequentially provided with an anoxic zone for nitration, an anoxic zone for wandering trapping sludge to lower the molecular weight and reduce the sludge quantity and provide carbon source for denitrification, and an aerobic zone SND (synchronous nitration and denitration action) for further denitrification, along the water direction in sequence, with a volume ratio of 23 percent: 45 percent: 32 percent, and each zone is grown with suitable microorganisms. The total nitrogen (TN) of the effluent is 10.2mg / L, and ammonia nitrogen is 1.9mg / L, COD is 31.2g / L, and the sludge yield is 0.068gMLSS / g COD. The invention has been applied for the treatment of residential domestic sewage.

Description

technical field [0001] The invention relates to a composite porous carrier sewage biological denitrification and sludge reduction coupled bioreactor and process, belonging to the field of sewage treatment. Background technique [0002] Sewage biological treatment technology has been playing a huge role in the process of sewage purification. But one of its main weaknesses is the large sludge production. The yield of activated sludge in the activated sludge process is about 1.0-1.5kgDS / kgBOD. Sludge treatment and final disposal require a large amount of infrastructure investment and high operating costs. At present, more than 90% of sludge cannot be treated and disposed of in a timely and effective manner, and many sewage plants with sludge treatment facilities have no place to store sludge, resulting in secondary pollution of sludge. In addition, from the perspective of operation, the removal effect of total nitrogen in sewage treatment plants is generally poor, especially ...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the problems of large sludge output and generally poor removal effect of total nitrogen in sewage treatment plants. In terms of economy, research and invent this device and process for sludge reduction, and at the same time use the carbon source released by the reduction of excess sludge as an effective carbon source for denitrification to improve the denitrification effect

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