High-efficiency denitrification artificial soil subsurface infiltration sewage treatment composite system and method

Abstract

The invention discloses a high-efficiency denitrification artificial soil subsurface infiltration sewage treatment composite system and a high-efficiency denitrification artificial soil subsurface infiltration sewage treatment composite method. The system comprises a grating tank, an anaerobic sedimentation tank, an adjustment tank and an artificial soil subsurface infiltration unit which are connected with each other sequentially; the water inlet of the grating tank is a domestic sewage inlet; the water outlet of the artificial soil subsurface infiltration unit is connected with the water inlet of the anaerobic sedimentation tank and a sampling tank respectively; and the bottom of the adjustment tank is provided with a submersible sewage pump which is connected with the artificial soil subsurface infiltration unit through a pipeline. The method comprises the following steps of: feeding domestic sewage into the grating tank to remove floating garbage, mixing the obtained raw sewage and backswater, feeding into the anaerobic sedimentation tank, performing anaerobic denitrification, and removing sludge particles and floating oil simultaneously; and feeding a mixed solution into the adjustment tank, pumping the mixed solution to the artificial soil subsurface infiltration unit by the submersible sewage pump and performing multi-stage filtering to obtain backswater and discharge water, and then discharging. High-efficiency denitrification is realized under the condition of guaranteeing that other indexes reach the standard, and the increasingly environment-friendly requirementis met.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a composite system and method for treating underground infiltration sewage in artificial land with high efficiency denitrification. Background technique [0002] Water pollution and water scarcity are two major problems facing human society today. The phenomenon of reducing available water due to water pollution exists widely in our country. Therefore, the implementation of sewage recycling is an effective way to solve the current shortage of water resources in our country. In order to realize the recycling of sewage, higher requirements are put forward for water treatment technology, not only to remove organic matter, but also to carry out advanced treatment of pollutants such as total nitrogen and total phosphorus. [0003] At present, most sewage treatment plants mainly use traditional processes such as activated sludge process (such as A / O, SBR and A / A / O, etc.). Hi...

AI Technical Summary

Problems solved by technology

But there are the following problems: (1) the sewage distributes water on the top surface of the percolation layer, emits odor, the landscape effect is poor, it is easy to breed mosquitoes and is greatly affected by the climate; (2) its oxygen supply only depends on the atmosphere to the percolation layer The air inhaled due to the vertical diffusion of the vertical diffusion and the change of the influent flow rate has a low oxygen supply intensity, and the oxygen supply cannot be guaranteed when the pollutant load is large

However, due to the lack of carbon source supply and the creation of an anaerobic environment, the denitrification capacity of the system is weak, and the removal effect of total nitrogen needs to be further improved.

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