A sewage biological treatment system and method

Abstract

The invention provides a sewage biological treatment system and method integrating biological filtering, shortcut nitrification, anaerobic ammonia oxidation and membrane biological reaction technologies. The sewage biological treatment system comprises a sludge reduction device, an efficient ammoxidation device and a membrane biological reaction device in sequential connection, wherein an intercepting net, a water distributor and a temperature controller are sequentially arranged inside the sludge reduction device; a sludge intercepting region used for intercepting sludge is arranged between the intercepting net and the water distributor; an aeration hose is arranged in the sludge intercepting region; an aeration pipe and an aerobic carrier region used for placing an aerobic carrier are arranged inside the efficient ammoxidation device; a membrane assembly and an anaerobic biological filtering region used for placing a filtering carrier are sequentially arranged inside the membrane biological reaction device. Through the biological immobilization, biological filtering and sludge discharging pipeline optimization, the generation and the discharging of the sludge are reduced; the shortcut nitrification, anaerobic ammonia oxidation and membrane biological treatment technologies are integrated; the denitrification efficiency is high; the COD removal capability is high; the hydraulic detention time is short.

Description

technical field [0001] The invention relates to a sewage treatment system, in particular to a sewage biological treatment system and method, and belongs to the technical field of water treatment. Background technique [0002] The efficient removal of ammonia nitrogen, total nitrogen and COD is the focus and difficulty of sewage biological treatment. For sewage with a low carbon-to-nitrogen ratio, using a systematic biological treatment device can not only improve the treatment effect, but also greatly reduce the operating cost. Oxidation ditch, A / O, A 2 Conventional biological treatment processes such as / O, SBR, and biological contact oxidation tanks can effectively remove ammonia nitrogen and COD under longer hydraulic retention time, but due to the limitation of organic carbon sources, it is difficult to remove total nitrogen in sewage, so artificial dosing is used The way of organic carbon source can improve the total nitrogen removal effect to a certain extent, but th...

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Problems solved by technology

Oxidation ditch, A / O, A 2 Conventional biological treatment processes such as / O, SBR, and biological contact oxidation tanks can effectively remove ammonia nitrogen and COD under longer hydraulic retention time, but due to the limitation of organic carbon sources, it is difficult to remove total nitrogen in sewage, so artificial dosing is used The way of organic carbon source can improve the removal effect of total nitrogen to a certain extent, but the operation management is complicated and the operation cost is high

New nitrogen removal technologies such as simultaneous nitrification and denitrification, short-cut nitrification and denitrification, and anammox can improve the removal effect of total nitrogen, but due to the lack of systematic control, it is difficult to maintain a stable treatment effect

MBR volume load is high, effluent water quality is stable, but membrane fouling occurs frequently and energy consumption is high

During the biological treatment of sewage, a large amount of excess sludge will be produced, the cost of sludge treatment and disposal is high, and the treatment technology is not mature

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