Sewage processing apparatus for depth-type underground soil percolation system

Abstract

A sewage processing apparatus for a depth-type underground soil percolation system. The sewage processing apparatus has a depth of 2-5 m, and mainly comprises an upper layer soil filling material with particle size of 0.10-0.30 mm, a middle layer soil filling material with particle size of 0.08-0.1 mm, and a lower layer soil filling material with particle size of 0.10-0.30 mm. A water inlet pipe is laid at the position with soil depth of 25-35 cm and a water outlet pipe is laid at a lowest layer. The apparatus provided by the invention has characteristics of high nitrogen removal efficiency, stable operation effect, no influence on ground landscape, low operation cost and simple management and maintenance, and can be applied to municipal sewage processing, rural centralized sewage processing and distributed household sewage processing.

Description

technical field [0001] The invention relates to a sewage treatment device, in particular to a sewage treatment device for a deep underground soil infiltration system. Background technique [0002] According to the guidelines of the land treatment system published by the United States Environmental Protection Agency (US EPA) and China Standard Press, the depth of the sewage treatment infiltration system is generally 1.0-2.0m, and there is no research report on the device of the infiltration system exceeding 2.0m. . The traditional view is that the removal of organic matter by the system mainly occurs within the range of 30-50 cm in the upper layer of the device, and the removal of ammonia nitrogen or total nitrogen is within the range of 50-120 cm. In the back section of the soil infiltration system (within the range of 90cm-120cm), COD<30mg / L, low biodegradability, denitrification is limited by carbon source, and the total nitrogen removal capacity of the system decrease...

AI Technical Summary

Problems solved by technology

In the back section of the soil infiltration system (within the range of 90cm-120cm), COD<30mg / L, low biodegradability, denitrification is limited by carbon source, and the total nitrogen removal capacity of the system decreases

In order to improve the removal efficiency of total nitrogen, the general soil infiltration system diverts raw sewage at a suitable depth in the lower soil layer to provide carbon source for denitrification reaction or put methanol in the latter part of the system; although this improves the removal rate of total nitrogen to a certain extent , but it has led to problems such as high operating costs and troublesome management and maintenance.

[0003] Aiming at the problems of low denitrification efficiency, high operating cost of supplementary carbon source, and troublesome management and maintenance of traditional underground soil infiltration system, a deep underground soil infiltration system is proposed, in which refractory organic matter can be used as carbon source to be reversed. The use of nitrifying bacteria, this sewage treatment device has the advantages of high nitrogen removal efficiency, simple operation and management, etc.

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