A device and method for simultaneous nitrification and denitrification biofilm treatment of sewage

Abstract

The invention discloses a device and method for disposing sewage by means of a simultaneous nitrification and denitrification biofilm method. The device sequentially comprises a sedimentation tank anda biofilm reactor, wherein the biofilm reactor is divided into an upper-layer area and a lower-layer area, and a partition plate is installed between the upper-layer area and the lower-layer area; small holes are formed in the edge of the partition plate, and the sewage can flow from the lower layer into the upper layer through the small holes; each small hole is provided with a filter net, and the filter nets are provided with flexible fins protruding upward; the lower-layer area is fixedly filled with an anaerobic biofilm filler, and the upper-layer area is filled with an aerobic biofilm filler in a suspended mode; an aeration apparatus is installed at the bottom of the upper-layer area, and a stirring apparatus is installed in the middle; a reflux pipe is installed on the top to make the sewage flow back from top to bottom for repeated denitrification disposal. The device has a simple structure and no dead zones in a reaction, nitrification and denitrification are achieved in a same container, the denitrification efficiency is high, and the sewage disposal effect is great.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a device and method for synchronous nitrification and denitrification biofilm treatment of sewage. Background technique [0002] With the development of my country's economy and the acceleration of urbanization, the problem of water resources has become increasingly prominent. The shortage of water quality-based water resources caused by water pollution is a huge challenge facing China's current social development. Sewage treatment is the best way to control water pollution from the source and the premise of realizing the utilization of regenerated water. [0003] Nutrients in sewage, such as N, are difficult to completely remove. If not effectively treated, it will cause non-point source pollution of receiving water bodies, especially closed water areas, such as eutrophication of water bodies. This is also an important reason for the continuous serious pollution of watersheds un...

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Problems solved by technology

With the increasing demand for sewage treatment, the traditional biological denitrification process has gradually shown many shortcomings: for example, the growth of nitrifying bacteria is relatively slow, and it is difficult to maintain a high biological concentration in the reactor, resulting in a long hydraulic retention time of the system and volume load. (2) acid is produced during nitrification and alkali is produced during denitrification, both of which need to be neutralized, which can easily cause secondary pollution, especially in high ammonia nitrogen wastewater, which is prone to denitrification ; (3) The process flow is long, and the activity of nitrifying bacteria is low in low temperature environment, which needs to increase the residence time of sewage, thus increasing the operating cost; (4) The denitrification reaction requires electron donors, especially low-carbon Nitrogen ratio wastewater, you need to add additional organic carbon source, increase the operating composition

Although new biological denitrification technologies such as short-cut nitrification and denitrification and anammox have obvious advantages in terms of efficiency, energy consumption, and especially the denitrification effect of sewage with low carbon-to-nitrogen ratio, they require relatively high self-control technology and Management level, currently only used in some special sewage treatment in developed areas

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