Sequencing batch internal circulation biological denitrification process and device thereof

Abstract

The invention discloses a sequencing batch internal circulation biological denitrification process. The process mainly comprises four steps of water feeding, biological denitrification reaction, precipitation and water and mud discharge. The biological denitrification reaction comprises an internal circulation reaction from short-cut nitrificaition treatment to deoxidation treatment, anaerobic ammoxidation treatment and to the short-cut nitrificaition treatment, and the short-cut nitrificaition treatment, the deoxidation treatment and the anaerobic ammoxidation treatment are carried out in three intercommunicated different reaction areas of one reactor. The invention further discloses a biological denitrification device. The device is separated into three intercommunicated reaction areas, that is, a short-cut nitrificaition treatment reaction area, a deoxidation treatment reaction area and an anaerobic ammoxidation treatment reaction area. The device is further equipped with an aerating device, an internal circulation pump, a water distributor and the like. The process has the advantages of convenient operation management, low energy consumption, high denitrification efficiency and stable treatment effect, and the device matching the process has the advantages of compact structure, convenient use, low cost and the like.

Description

technical field [0001] The invention relates to biological treatment of waste water or sewage, in particular to a waste (sewage) water biological treatment process and device of short-range nitrification-anaerobic ammonium oxidation. Background technique [0002] Wastewater denitrification methods include physical and chemical methods and biochemical methods, among which biochemical methods are generally considered to be more economical and effective denitrification technologies. Therefore, the research and development of high-efficiency, low-cost biological denitrification processes and devices has become an important issue in the field of water treatment. research topic. [0003] The traditional aerobic-anaerobic biological denitrification process (A / O method) is mainly completed through the cooperation of two biological reaction processes of nitrification-denitrification. In the nitrification stage, the process of ammonium nitrogen being converted to nitrate nitrogen is ...

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Problems solved by technology

These engineering applications have proved in practice that the short-cut nitrification and anaerobic ammonium oxidation combined process has various characteristics such as low energy consumption, low sludge production, low investment cost and operating cost, but it also exposes the shortcomings of the two main process types at present

The two-stage process is prone to the problem that the concentration of nitrite accumulated in the short-cut nitrification stage is too high to inhibit microorganisms. At the same time, because the short-cut nitrification and anaerobic ammonium oxidation are carried out in different containers, the capital investment and land occupation of the whole process The area increases; the first-level process reduces the activity of anammox bacteria to a certain extent because the obligate anaerobic anammox bacteria are kept in a certain concentration of aerobic environment for a long time

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