A method for treating sewage with a low carbon-to-nitrogen ratio and a denitrification percolation system

Abstract

The invention discloses a method and a denitrification infiltration system for treating sewage with a low carbon-nitrogen ratio. The system comprises a regulating tank, a lifting pump, a denitrification tank and a water collecting tank, wherein the lifting pump is arranged between the regulating tank and the denitrification tank, a water inlet end and a water outlet end are arranged on the lifting pump, the water inlet end of the lifting pump is connected with the regulating tank through a pipeline, and the water outlet end of the lifting pump is connected with the denitrification tank; the denitrification tank is connected with the water collecting tank through a pipeline; a flooding layer, a slow-release carbon-source layer, a filler layer, an impermeable membrane and a supporting layer are sequentially arranged in the denitrification layer from top to bottom. The method and denitrification infiltration system disclosed by the invention are suitable for treating the sewage with a low carbon-nitrogen ratio of urban secondary sewage treatment plant yielding water and the like, and the system is simple in equipment and convenient in operation management and does not cause secondary pollution. Moreover, the addition is wide in source and low in price, the carbon source is slowly released and can be easily controlled, the removal of nitrate nitrogen and total nitrogen is improved by enhancing the treatment of a denitrification stage, and the processing capacity of the whole process is improved.

Description

technical field [0001] The invention relates to the technical field of environmental engineering water treatment, in particular to a method for treating sewage with a low carbon-to-nitrogen ratio and a denitrification and percolation system. Background technique [0002] The TN concentration in the effluent of the urban secondary sewage plant is required to be lower than the first-level A standard of the "Pollutant Discharge Standard for Urban Sewage Treatment Plants" (GB18918-2002), that is, the TN concentration in the effluent is less than 15mg / L. With the rapid development of the economy, nitrogen and organic matter are constantly leaking in, causing the water bodies of lakes and reservoirs to deteriorate day by day, and the problem of eutrophication of water bodies is quite serious. Nitrogen pollution control has been paid more and more attention, and has become an important task of water pollution control at present and in the future. The characteristic of the effluent...

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for treating low carbon-to-nitrogen ratio sewage and a denitrification percolation system, aiming at solving the problem of the low efficiency of denitrification in low-carbon-to-nitrogen ratio sewage in the prior art The problem

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