Activated sludge and biomembrane combined biological denitrification and dephosphorization treatment process

Abstract

The invention discloses an activated sludge and biomembrane combined biological denitrification and dephosphorization treatment process, wherein dual sludge systems are employed to control the growth of nitrated bacterium, and the process is divided into two phases, in the first phase, an anaerobic / anoxybiotic / aerobic combined activated sludge process is employed to facilitate the growth of denitrifying bacteria, in the latter phase, a biological film method is employed to facilitate the growth of nitrated bacterium therein.

Description

Technical field: [0001] The invention relates to the technical field of sewage treatment, in particular to a biological nitrogen and phosphorus removal treatment method combining activated sludge and biofilm. Background technique: [0002] Serious water pollution and shortage of water resources have seriously affected the sustainable development of my country's economy. With the improvement of environmental requirements and the prevention of eutrophication of water bodies, in the process of sewage treatment, many sewage treatment plants require nitrogen and phosphorus removal, and phosphorus removal methods Among them, there are mainly two kinds of chemical phosphorus removal and biological phosphorus removal at present. The two methods of phosphorus removal are suitable for different water quality conditions, and each has its own advantages and disadvantages. Chemical phosphorus removal is to add an appropriate amount of phosphorus removal agent in water to make phosphorus ac...

AI Technical Summary

Problems solved by technology

After in-depth research on the mechanism of biological denitrification and phosphorus removal, phosphorus accumulating bacteria, denitrifying bacteria, and nitrifying bacteria coexist in the same activated sludge system in conventional activated sludge biological nitrogen and phosphorus removal methods. Excessive absorption of phosphorus by sludge, and then removal of phosphorus-rich sludge as residual sludge, there must be a dispute between nitrifying bacteria and phosphorus-accumulating bacteria at different sludge ages, so that phosphorus removal and nitrification interfere with each other; at the same time, because of nitrification Bacteria are autotrophic obligate aerobic microorganisms, and denitrifying bacteria and phosphorus-accumulating bacteria are heterotrophic facultative bacteria. Although the alternating anaerobic / anoxic / aerobic operating conditions of the system are conducive to denitrification and phosphorus removal, However, it is not an ideal environment for nitrifying bacteria. In this conventional biological nitrogen and phosphorus removal system, there is a contradiction between the sludge age of nitrifying bacteria and phosphorus accumulating bacteria, and the contradiction between denitrification and anaerobic phosphorus release of phosphorus accumulating bacteria.

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