Denitrification wall for blocking and controlling non-point source nitrogen pollution at tail end and application of denitrification wall

Abstract

The invention provides a denitrification wall for blocking and controlling non-point source nitrogen pollution at the tail end and application of the denitrification wall, and relates to the technical field of non-point source nitrogen pollution control. The denitrification wall provided by the invention comprises a seepage guide ditch, a first-stage wall body and a second-stage wall body which are sequentially arranged along a runoff direction; and the first-stage wall body is filled with a carbon source. According to the invention, suspended matters in runoff can be well intercepted by utilizing the seepage guide ditch, so that the possibility of blockage of the denitrification wall body is reduced; and meanwhile, the runoff can be introduced into the bottom through the seepage guide ditch, an anoxic environment is preliminarily built, and subsequent denitrification is facilitated. The first-stage wall body is filled with the carbon source, nitrate nitrogen in runoff can be denitrified under the action of denitrifying bacteria, and organic matter in the runoff can be degraded to be effectively removed by the redundant carbon source flowing out of the first-stage wall body through the second-stage wall body. The denitrification wall provided by the invention is provided with two-stage wall bodies, nitrogen pollution and organic matter pollution of input water are reduced at the same time, and terminal resistance and control of non-point source pollution can be realized.

Description

technical field [0001] The invention relates to the technical field of area source nitrogen pollution control, in particular to a denitrification wall for terminal resistance and control of area source nitrogen pollution and an application thereof. Background technique [0002] The sources of non-point source pollution produced by surface runoff are many and scattered. The traditional point source denitrification process is not suitable for the treatment of nitrogen pollution in runoff. The cost is high and the effect is slow. Therefore, the effective removal of nitrogen pollution in surface runoff is one of the current environmental problems, and it is also an important way to reduce the input load of nitrogen from external sources in water. The control methods of nitrogen pollution in surface runoff include source control, process blocking and terminal blocking. The shore zone of the water body can be used as a key barrier of the water-land interface. Therefore, rationall...

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Problems solved by technology

[0004] At present, the commonly used end-resistance control technologies include plant buffer strips, artificial wetlands, ecological ditches and other technologies. Due to the lack of anoxic conditions or carbon sources required for biological denitrification, these technologies are relatively weak in removing nitrate.

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