Method for treating rubbish percolates of different times for deep denitrification by using bipolar USAB+A/O+SBR process

Abstract

The invention discloses a method for treating rubbish percolates of different times for deep denitrification by using a bipolar USAB+A / O+SBR process, which belongs to the technical field of biological denitrification and is suitable for performing advanced treatment on the rubbish percolates. In the method, water output by an A / O reactor passes through a secondary sedimentation tank, then part of the water flows back into a first-stage UASB reactor to perform denitrification, so the method fully uses sufficient carbon sources of raw water, realizes an efficient denitrification efficiency, and fully uses the characteristic that the rubbish percolates contain high-concentration organic substances. Dissolved oxygen (DO), an oxidation-reduction potential (ORP) and a pH value sensor are used for monitoring the degradation and the short-range nitrification / denitrification processes of the organic substances in the reactor, and the short-range nitrification / denitrification processes can be well controlled according to monitored pH values and ORP values. The average ammonia nitrogen concentration of final yielding water is 2 mg / L, the total nitrogen concentration is lower than 40 mg / L, and the ammonia nitrogen removal rate and the total nitrogen removal rate are above 98 percent. The method completely depends on biological treatments, reduces the cost and simplifies the process. The method performs denitrification on the rubbish percolates, not only realizes complete nitrification but also realizes short-range nitrification, and realizes the deep removal of the nitrogen in the rubbish percolates.

Description

technical field [0001] The invention relates to a deep denitrification method for treating landfill leachate, which belongs to the technical field of biological denitrification of urban domestic waste leachate through combined anaerobic and aerobic processes, and is suitable for advanced treatment of landfill leachate. Background technique [0002] Due to the nature, economic strength and technical level of our country's garbage, more than 90% of the garbage disposal is to adopt the sanitary landfill method. However, after the sanitary landfill of garbage, due to the fermentation of garbage, the infiltration of rainwater and the rise of groundwater level, there will be a considerable amount of leachate in the landfill. Landfill leachate is a kind of high-concentration organic wastewater with large changes in water quality and quantity, imbalance in the proportion of microbial nutrient elements, high ammonia nitrogen content, and complex components. The concentration of orga...

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Problems solved by technology

[0004] However, at present, there are not many studies on the realization of complete nitrification and short-range nitrification of wastewater with high ammonia nitrogen concentration.

And so far, the successful application of biological denitrification through the short-cut nitrification pathway in actual engineering is rare.

The main reason is that the control factors affecting the accumulation of nitrite are relatively complex, and the nitric acid bacteria can rapidly convert NO 2 - -N converted to NO 3 - -N, therefore, causing the short-cut nitrification denitrification process that has been realized to return to the full-range nitrification process

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