Denitrification treatment device for modularized vertical subsurface flow constructed wetland

Abstract

The invention belongs to the technical field of environmental protection and particularly relates to a denitrification treatment device for a modularized vertical subsurface flow constructed wetland. According to the denitrification treatment device for the modularized vertical subsurface flow constructed wetland, a conventional constructed wetland is divided into different functional areas, such as a plant water distribution area, a reoxygenation area and an anoxic area. The division of these functional areas is performed through plenty of small modules, so as to facilitate construction, facilitate surface matrix replacement, facilitate aeration of a wetland system, improve wetland processing capacity and better facilitate follow-up maintenance of the wetland.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a modular vertical underflow artificial wetland denitrification treatment device. Background technique [0002] Constructed Wetlands is a sewage treatment technology developed in the late 1970s, which emerged in the United States, Australia, the Netherlands, Denmark, the United Kingdom and other countries. Its characteristics are: good effluent quality, strong organic matter and ammonia nitrogen treatment capacity, convenient operation and maintenance, simple management, low investment and operating costs. According to relevant data, the investment and operating costs of constructed wetlands only account for 50% to 80% of traditional secondary biochemical treatment technologies. Therefore, it is more suitable for small and medium-sized towns and villages with less funds, energy shortages and technical talents. [0003] However, some problems have gr...

AI Technical Summary

Problems solved by technology

In particular, vertical subsurface flow wetlands should have a better oxygenation effect in theory, but due to the long-term operation of the wetland, the wetland internal matrix infiltration area increases, the porosity decreases, and a good aerobic environment cannot be created.

At the same time, the emergence of wetland blockage will further hinder the air exchange inside and outside the wetland, causing internal hypoxia and affecting the removal of organic matter and ammonia nitrogen.

Therefore, such common problems make it difficult to increase the pollution load of constructed wetlands, relatively increase the requirements for operation and maintenance, and limit the application

At present, the problem of eutrophication in rivers and lakes is prominent, and the state has put forward requirements for the total nitrogen index of sewage treatment. How to achieve a total nitrogen treatment rate of more than 50% in primary wetlands has become an urgent need in the application of vertical subsurface flow constructed wetlands. solved problem

In this regard, it is necessary to propose a technology that requires low maintenance while improving fundamental problems such as wetland blockage, insufficient oxygen supply, and low nitrogen removal efficiency.

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