Reaction zone-adjustable two-stage anoxic/aerobic biofilm sewage treatment system

Abstract

A reaction zone-adjustable two-stage anoxic / aerobic biofilm sewage treatment system is disclosed and comprises a first-stage A / O unit and a second-stage A / O unit which are connected in sequence, wherein the first-stage A / O unit comprises a first anoxic reactor, a second anoxic / aerobic reactor, a third aerobic reactor, a fourth aerobic reactor and a fifth aerobic reactor which are connected in sequence, and the second-stage A / O unit comprises a sixth anoxic reactor, a seventh anoxic reactor and an eighth aerobic reactor which are connected in sequence. The system is provided with the front denitrification device and the rear denitrification device, the high-efficiency utilization and denitrification efficiency of a carbon source in the raw water is improved, the denitrification capacity ofthe system is effectively controlled according to treatment target requirements through accurate control over addition of an exogenous carbon source in post denitrification, the most economical efficiency and stability of sewage denitrification treatment are achieved, and the system is suitable for sewage treatment with high emission standards and can be automatically controlled and adjusted through a reaction space and reaction conditions.

Description

Technical field [0001] The invention relates to a system for sewage treatment through anoxic / aerobic biofilm, and belongs to the technical field of sewage treatment. Background technique [0002] With the improvement of water pollutant discharge standards for sewage treatment plants, especially in terms of nitrogen-related water quality indicators, the requirements are becoming more stringent. The traditional activated sludge-based A 2 / O and its deformation process, obviously can not meet the requirements, and in order to improve the efficiency of urban sewage denitrification, it is necessary to set a longer sludge age and hydraulic retention time, and also need to control a higher amount of aeration. High investment and high energy consumption are contrary to the green development mode advocated by the state. [0003] Fluctuations in water quality, water volume, and water temperature directly affect the efficiency and stability of the sewage treatment system, and thus result in h...

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Problems solved by technology

[0004] Although the anoxic / aerobic process and the biofilm technology are all existing technologies, the existing activated sludge method single-stage or multi-stage A / O process is that the activated sludge circulates and reacts in an anoxic and aerobic alternate environment. This kind of activated sludge method system cannot realize partition functional design, the efficiency of biological denitrification is low, and the investment and operation costs are high

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