River bank type infiltration system and method with water body remediation function

Abstract

The invention relates to a river bank type infiltration system and a method with a water body remediation function. The river tank type infiltration system comprises a water diversion facility with aforebay, wherein multiple infiltration tanks stepwise arranged along two sides of a river bank are arranged at a downstream of the water diversion facility; a trash holding meshes are arranged at upstreams of inlets of the infiltration tanks; an intake gate and a discharge gate are arranged at an inlet part and an outlet part of each filter tank; each discharge gate is connected with a discharge tank communicated with a river channel; each infiltration tank is sequentially provided with a porous water retaining breast wall, a front permeable section, a multi-stage infiltration section, a rearpermeable section and a porous plate from the inlet to the outlet. The infiltration system is located beside at the river bank or a lake bank, is combined with an existing water conservancy project and is joined with a shoreside terrain, so that the normal operation of an original water conservancy project cannot be affected, and the water quality of the downstream river channel is maintained andimproved at the same time; the infiltration system can be also combined with river bank remediation, and green plants are planted at the upper part, so that the environment is beautified. The system has low cost, and is suitable for advanced nitrogen and phosphorus removal of seriously polluted urban rivers and sewage treatment plant tail water, and control of agricultural non-point source pollution.

Description

technical field [0001] The invention relates to a river bank type infiltration system and method with water body repairing function, is an environmental protection system and method, and is an engineering measure for controlling river pollution and can be renewed and maintained. Background technique [0002] There are three main treatment methods for existing polluted water bodies, one is the activated sludge method, the second is the sewage biofilm method, and the third is the ecological treatment method. The activated sludge method is the main process type of the existing sewage treatment plants in my country, which is equivalent to the artificial enhancement of the self-purification ability of the water body. It has the advantages of high treatment capacity and good effluent quality, but the engineering investment and maintenance costs of this type of treatment method are relatively high. Specific treatment processes include AB method, SBR method, oxidation ditch method, ...

AI Technical Summary

Problems solved by technology

But its shortcomings are: First, the length of the seepage path of the system is insufficient, when the hydraulic load reaches 2.0m 3 / m 2 When d is above, the hydraulic retention time is shortened, the metabolism of microorganisms is limited, and the removal rate of COD, TN, and TP decreases, thus affecting the water purification efficiency

Second, the osmotic pressure required by the system needs to be realized by using water pumps, long-term operation and high energy consumption

First of all, excavating the river bed to build the infiltration project itself destroys the living environment of benthic animals and causes secondary pollution. At the same time, the infiltration system is soaked in sewage and the bottom of the river bed for a long time, making operation and maintenance difficult; second, the main function of aquatic plants is Restoring the ecosystem of the river channel and assisting in the establishment of the landscape effect of the river channel, although it can absorb part of nitrogen, phosphorus and other pollutants, its effect is relatively weak and is significantly affected by the natural environment

Third, most rivers have water conservancy needs such as flood discharge, fish passing, and navigation. Building filtration facilities directly in the river will have adverse effects on water conservancy functions

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