Multi-grade AO sewage treatment equipment with strengthened denitrification and phosphorous removal function

Abstract

The invention provides multi-grade AO sewage treatment equipment with a strengthened denitrification and phosphorous removal function. The multi-grade AO sewage treatment equipment comprises a pre-positioned oxygen-deficiency and anaerobic sedimentation tank, at least two aerobic and oxygen-deficiency sedimentation tanks and a sediment clarification tank; an oxygen-deficiency region, an anaerobicsedimentation region, an aerobic aeration region, an oxygen-deficiency sedimentation region, an Nth aerobic aeration region, an Nth anaerobic sedimentation region and a final sediment clarification region are sequentially arranged along the water flow direction from upstream to downstream; three-dimensional biological rope filler is arranged in the oxygen-deficiency region and the aerobic aerationregion; activated sludge layers are deposited in the anaerobic sedimentation region and the oxygen-deficiency sedimentation region; inclined tube filler is arranged in the sediment clarification tankand water flow is controlled to flow along a snake-shaped path; the contact area of sewage, the three-dimensional biological rope filler, activated sludge and the inclined tube filler is enlarged andthe contact time is prolonged, so that the sewage treatment effect is remarkably improved, and requirements of economic society and the improvement of science and technology on sewage treatment are basically met.

Description

technical field [0001] The invention relates to the technical field of sewage treatment equipment, in particular to a multi-stage AO sewage treatment equipment with enhanced denitrification and phosphorus removal functions. Background technique [0002] With the development of the economy and the improvement of people's living standards, the popularization and treatment level of domestic sewage treatment facilities in villages and towns in China is far from suitable for the development of the society. The discharge of nitrogen-containing organic matter and phosphorus-containing organic matter continues to increase. The resulting eutrophication of the water body is becoming more and more serious, and the water quality of the water body is deteriorating. [0003] Most of the sewage treatment equipment in villages and towns adopts the traditional A 2 O process (that is, anaerobic-anoxic-aerobic process), while the traditional A 2 Due to the contradiction between denitrificati...

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Problems solved by technology

[0003] Most of the sewage treatment equipment in villages and towns adopts the traditional A 2 O process (that is, anaerobic-anoxic-aerobic process), while the traditional A 2 Due to the contradiction between denitrification and phosphorus removal in the O process, it is difficult to obtain efficient nitrogen and phosphorus removal effects in the same reaction tank, which shows that the removal rate of nitrogen and phosphorus in sewage is low. Competition for carbon source between denitrifying bacteria and phosphorus accumulating bacteria in the process

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