Water treatment method for removing total nitrogen through two-stage AO of environmental microorganisms and step inflowing

Abstract

The invention discloses a water treatment method for removing total nitrogen through two-stage AO of environmental microorganisms and step inflowing. An active sludge system is constructed by adding environmental microorganisms; meanwhile, by adjusting the operating parameters and external factors such as inflow rate distribution, volumes of an anoxic tank and an aerobic tank, the sludge age and the reflux ratio in each stage of the process according to the inflow water quality, a two-stage A / O process of environmental microorganisms and step inflowing is formed; in a practice process of sewage treatment, through consistent optimization and summarization, targeted environmental microorganisms are screened out, nitrifying bacteria can become dominant bacteria in a biological system, thus the ability of degrading ammonia nitrogen is greatly enhanced, and a better and more thorough nitrogen removal effect of a relatively conventional A / O system is ensured. Meanwhile, to meet the increasingly strict requirement on total nitrogen index in all industries, a biological nitrogen removal technology of environmental microorganism and A / O is improved and upgraded into a two-stage A / O biological nitrogen removal technology of environmental microorganisms and step inflowing, and the objectives of increasing the removal rate of total nitrogen and reducing the operation cost are achieved.

Description

technical field [0001] The invention relates to the technical field of sewage biological treatment and sewage resource utilization, in particular to a water treatment method for removing total nitrogen by two-stage AO of environmental microorganisms and segmented water inflow. Background technique [0002] With the concentration of urban population and the development of industry and agriculture, the problem of eutrophication of water body is becoming more and more serious, and total nitrogen is the main index reflecting the eutrophication of water body. In order to curb the deteriorating trend of the water environment, a large number of sewage treatment facilities have been built and put into operation in my country, which has greatly improved the water environment. However, due to historical reasons, most sewage treatment plants (stations) have unsatisfactory removal effects on total nitrogen, and the country has continuously put forward strict requirements on total nitr...

AI Technical Summary

Problems solved by technology

At present, the most widely used denitrification processes in sewage treatment include A / O pre-denitrification process, oxidation ditch process, SBR and deformation process, MBR process, etc., but are limited by reflux ratio, C / N ratio, microbial flora, etc. The removal efficiency of the above process for total nitrogen is low (70-80%), so the ideal harmless treatment effect has not been achieved

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