Short-range nitrification-denitrification municipal wastewater treatment system and method

Abstract

The invention discloses short-range nitrification-denitrification municipal wastewater treatment system and method. The short-range nitrification-denitrification municipal wastewater treatment systemcomprises a water storage pond, a primary settling tank, a facultative tank, an aerobic tank and a secondary settling tank communicating sequentially, wherein a grid is arranged between the water storage pond and the primary settling tank; municipal wastewater from the water storage pond passes through the grid, so that suspended solids are preliminarily removed; a feeding port is formed between the primary settling tank and the facultative tank; a sewage reflow system is arranged between the aerobic tank and the facultative tank; a part of sewage in the aerobic tank reflows to the facultativetank through the sewage reflow system; a sludge reflow system is arranged between the secondary settling tank and the facultative tank; a part of sludge reflows to the facultative tank; excess sludgeis discharged through a sludge discharge system. According to the short-range nitrification-denitrification municipal wastewater treatment system and the method provided by the invention, through controlling the process conditions, a nitrification tank-aerobic tank is simplified to be a short-range nitrification tank, so that the required kinetic energy is greatly reduced; therefore, compared with a common municipal wastewater treatment process, according to the process, the capital construction cost is remarkably reduced, the treatment capacity is high, the effect is good, and the process ishigh-efficiency and stable.

Description

technical field [0001] The invention relates to the field of municipal sewage treatment, in particular to a municipal sewage short-range nitrification-denitrification treatment system and method. Background technique [0002] With the rapid development of my country's economy, the population continues to increase, the urban population expands rapidly, the daily water consumption increases sharply, and the discharge of sewage across the country increases sharply. Water pollution is very serious, resulting in a shortage of urban rainwater resources, which not only restricts the concept of green and sustainable development, but also destroys the ecological balance of the water environment, threatening the life and health of urban residents. Municipal sewage mainly includes some industrial sewage, hospital sewage and domestic sewage and so on. Most of the municipal sewage contains organic pollutants, and the content of ammonia nitrogen is high. Direct discharge to the sewage wi...

AI Technical Summary

Problems solved by technology

Most of the municipal sewage contains organic pollutants, and the content of ammonia nitrogen is high. Direct discharge to the water body will lead to water pollution, eutrophication, and damage to the aquatic ecosystem.

[0003] According to the survey, the existing municipal sewage treatment plants in my country still use the traditional activated sludge method many years ago. The treatment effect is low and the area is large. Faced with the sharp increase of municipal sewage, many treatment plants are overloaded. , resulting in substandard effluent water quality, causing a vicious circle

Images