Method for enhanced nitrogen removal of tidal flow-horizontal subsurface flow hybrid constructed wetland and system thereof

Abstract

The invention belongs to the technical field of sewage treatment and specifically relates to a method for enhanced nitrogen removal of a tidal flow-horizontal subsurface flow hybrid constructed wetland and a system thereof. The system orderly comprises a non-powered automatic water intake device (8), a tidal-flow constructed wetland bed, a non-powered automatic water drainage device (2) and a horizontal subsurface-flow constructed wetland bed. The tidal-flow constructed wetland which is high in ammonia nitrogen oxidation effect and the horizontal subsurface-flow constructed wetland which is excellent in nitrate reduction capability are rationally combined into one system by thoroughly utilizing the characteristics of the aerobic environment of the former and the anaerobic environment of the latter; therefore, conditions are created for thorough nitration / denitrification; and simultaneously, a horizontal subsurface-flow wetland slow-release carbon source enhanced region (15) and a backflow well (19) are arranged in the horizontal subsurface-flow wetland bed, so that enhanced removal of total nitrogen in the sewage can be realized and secondary pollution on the carbon source is avoided at the same time.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method and a system for strengthening denitrification in a tidal flow-horizontal subsurface flow combined constructed wetland. Background technique [0002] In recent years, with the rapid development of the economy and the continuous improvement of people's living standards, the amount of sewage discharge has also continued to increase, making my country's water eutrophication and water quality deterioration increasingly serious. At present, my country's sewage treatment mainly relies on the traditional centralized water treatment process. Although the technology and process have become increasingly mature and perfect, they are facing the problem of high construction and operation costs. Many economically underdeveloped areas simply cannot afford large-scale water treatment. Sewage treatment plants or many established sewage treatment plants are idle due to...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of poor reoxygenation capacity, low dissolved oxygen level, and incomplete denitrification effect that often occur in traditional constructed wetlands, the present invention provides a method and system for enhanced denitrification in a tidal flow-horizontal subsurface flow combined constructed wetland. The principle of complementary advantages, making full use of the characteristics of good reoxygenation effect of tidal flow constructed wetland and anoxic bed of horizontal subsurface flow constructed wetland, creates conditions for full nitrification / denitrification, and realizes enhanced removal of nitrogen in wastewater

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