Improved artificial rapid infiltration integrated device based on agricultural waste carbon slow release enhanced biological nitrogen removal and synchronous phosphorus removal and application thereof

Abstract

The invention discloses an improved artificial rapid infiltration integrated device based on agricultural waste carbon slow release enhanced biological nitrogen removal and synchronous phosphorus removal and application thereof. The device comprises a water inlet tank, a water inlet pipe, a water distributor, an artificial rapid infiltration tank and a water outlet pipe, wherein the water inlet tank is communicated with the water distributor through the water inlet pipe, a peristaltic pump is arranged on the water inlet pipe, the water distributor is arranged at the top of the artificial rapidinfiltration tank, the artificial rapid infiltration tank comprises an upper tank body and a lower tank body which are communicated with each other up and down, and the top of the upper tank body isprovided with an opening, the upper tank body is internally provided with a protective layer, a water distribution layer, a first filter material layer and a capillary blocking layer from top to bottom in order, wherein the lower tank body is in flange connection with the upper tank body, a slow-release carbon source layer, a second filter material layer and a supporting layer are sequentially arranged in the lower tank body from top to bottom, one end of the water outlet pipe is communicated with the bottom of the supporting layer, and the other end of the water outlet pipe is flush with thebottom of the capillary blocking layer. The device is simple in structure and good in nitrogen and phosphorus removal effect on sewage.

Description

technical field [0001] The invention relates to an improved artificial rapid percolation integrated device based on the slow release of carbon from agricultural waste and enhanced biological denitrification and simultaneous dephosphorization and its application, belonging to the technical field of sewage treatment. Background technique [0002] In most rural areas of my country, especially the arid and semi-arid areas in the central and western regions, rural sewage treatment facilities are seriously lagging behind, and the sewage treatment effect is poor, resulting in serious pollution of receiving water bodies, seriously threatening the quality of water resources, and domestic sewage treatment is imminent. In arid and semi-arid areas, the population is small and the distribution is relatively scattered, the amount of sewage is small and fluctuates greatly, and sewage collection is difficult. In addition, the economic level is low, the funds and energy invested in sewage tre...

AI Technical Summary

Problems solved by technology

The upper part of the artificial rapid infiltration tank presents an aerobic environment, while the lower part of the rapid infiltration tank presents an anoxic / anaerobic environment. The organic matter in the sewage is mainly oxidized and degraded by the action of aerobic microorganisms, and the organic nitrogen is converted into ammonia nitrogen by the action of microorganisms. Ammonia nitrogen needs to undergo three processes of packing adsorption, nitrification and denitrification in the artificial rapid infiltration system, and is removed through biological and abiotic mechanisms. Under the condition of anoxic / anaerobic environment in the lower part of the quick infiltration tank, the nitrate nitrogen is removed through denitrification, and the artificial rapid infiltration system is effective for COD, BOD and NH 3 The removal effects of -N can reach 85%, 90%, and 90% respectively. However, the anaerobic denitrification in the lower part of the quick seepage tank is limited to a certain extent because the organic carbon source is removed in the upper part of the quick seepage tank, resulting in insufficient organic carbon source in the lower part. , leading to a low removal rate of TN in the artificial rapid infiltration system, about 10-30%

Adding additional carbon sources such as methanol, ethanol, sodium acetate, and glucose can improve the denitrification effect of the artificial rapid infiltration system, but the addition of these liquid carbon sources is difficult to control, and excessive amounts can easily cause secondary pollution. There are problems such as high cost, and the addition of methanol and other substances requires a certain period of microbial adaptation. It is a good choice to realize "using waste to waste" by exploring cheap and easy-to-obtain carbon sources such as natural plants or agricultural waste , but natural plants or agricultural wastes have problems such as insufficient carbon release and unstable effects

In addition, the removal of TP by the artificial rapid infiltration system is mainly through chemical precipitation and adsorption, while the adsorption effect of ordinary fillers on phosphorus is very limited. Generally speaking, the removal rate of TP by the artificial rapid infiltration system is only 40%. ~60%

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