Trickling filtration technique and device for effectively removing nitrate nitrogen in high-nitrogen low-carbon environment

Abstract

The invention discloses a trickling filtration technique and device for effectively removing nitrate nitrogen in a high-nitrogen low-carbon environment. The trickling filtration technique comprises the following steps: sewage is firstly lifted to the top of a trickling filter to implement uniform water distribution, wherein the treatment water temperature is not lower than 8 DEG C, the height of the filter layer is 1.2-1.5m, and the filter layer is filled with a sulfur-limestone mixed filler; and in an anoxic state, the sewage passes through the filter layer, and finally submerges the effluent at the bottom of the filter material. According to the characteristics of higher nitrate nitrogen content and lower carbon-nitrogen ratio in the sewage, the trickling filtration technique is improved, the filler is improved, the parameters are adjusted, and the trickling filter is improved; the water is uniformly distributed on the top of the filter tank, penetrates through the special denitrification filter layer, and submerges the effluent at the bottom of the filter material; and in the anoxic state, sulfur autotrophic nitrobacteria are utilized to oxidize the sulfur into sulfates and reduce the nitrate nitrogen into nitrogen, thereby finally achieving the goal of efficiently removing nitrate nitrogen and greatly relieving the environmental pressure.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a trickle filtration technology and a device thereof for effectively removing nitrate nitrogen in a high-nitrogen and low-carbon environment. Background technique [0002] In many rural areas, with the sharp reduction of per capita arable land of farmers, greenhouse cultivation is developing into the main form of agricultural production. Most of the main vegetable growing areas near cities adopt the method of greenhouse cultivation. The vegetables grown in this way are mature. The short period and high soil use rate lead to serious shortage of soil fertility, and additional chemical fertilizers must be added, resulting in serious pollution of surface runoff and shallow groundwater in these greenhouse vegetable planting areas; especially for some broad-leaved vegetables that are in high demand, such as lettuce and cabbage etc., because the market digests quick...

AI Technical Summary

Problems solved by technology

[0002] In many rural areas, with the sharp reduction of per capita arable land of farmers, greenhouse cultivation is developing into the main form of agricultural production. Most of the main vegetable growing areas near cities adopt the method of greenhouse cultivation. The vegetables grown in this way are mature. The short period and high soil use rate lead to serious shortage of soil fertility, and additional chemical fertilizers must be added, resulting in serious pollution of surface runoff and shallow groundwater in these greenhouse vegetable planting areas; especially for some broad-leaved vegetables that are in high demand, such as lettuce and cabbage etc., because the market digests quickly, so many plants are planted, and these vegetables have a huge demand for nitrogen fertilizer, which has caused serious nitrate pollution in shallow groundwater in such vegetable planting areas, and has a high nitrate nitrogen content and a high carbon-nitrogen ratio. In addition, there are such problems in the tail water of urban sewage treatment plants and the return water of farmland in traditional agricultural areas. The high nitrate content in sewage has also become a bottleneck problem in water quality treatment.

[0003] At present, biological filters are used for sewage treatment. The principle is to use the biofilm fixed on the carrier to absorb and intercept the organic substances in the sewage and decompose the substances. Although the cost is low and the management is simple, the purification efficiency is not high. And it is mainly suitable for treating domestic sewage with high organic matter content, not suitable for purifying sewage in a high-nitrogen and low-carbon environment, and it is very difficult to remove nitrate and nitrogen in this biological filter

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