Intermittent aeration and membrane biological integrated water treatment device

Abstract

The invention discloses an intermittent aeration and membrane biological integrated water treatment device which comprises a biochemical pool, a membrane treatment pool, a water pump, a submerged aerator, an air pipe, a control valve, a sludge pump and a sludge return pipe. The water pump is connected with the biochemical pool and used for pumping sewage to be treated into the biochemical pool, the submerged aerator is placed into the biochemical pool and externally connected with the air pipe, the control valve is mounted on the air pipe and connected with a controller for controlling intermittent opening of the control valve, the membrane treatment pool is connected with the biochemical pool through a pipeline, a membrane bioreactor is arranged in the biochemical pool, two ends of the sludge return pipe are connected with the membrane treatment pool and the biochemical pool, and the sludge pump is mounted on the sludge return pipe. Nitrogen and phosphorus removal effects of sewage and wastewater biochemical treatment can be remarkably improved, and sewage and wastewater treatment energy consumption can be effectively reduced.

Description

technical field [0001] The invention relates to the field of industrial waste water and domestic sewage treatment, in particular, it belongs to an intermittent aeration and membrane bio-integrated water treatment equipment. Background technique [0002] Nitrogen and phosphorus removal from sewage and wastewater is an important task in water treatment. Excessive content of nitrogen, phosphorus and other nutrients in water will lead to eutrophication of water body, which will lead to a sharp deterioration of water quality. With the increasing emphasis on environmental protection in our country, it is imperative to improve the discharge standards of sewage and waste water, especially the discharge standards of nitrogen and phosphorus. [0003] The anaerobic-anoxic-aerobic (AAO) process is the most widely used biochemical nitrogen and phosphorus removal process for sewage. The pretreated sewage undergoes anaerobic, anoxic, and aerobic reactions in the biochemical reaction tank a...

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Problems solved by technology

[0005] First, excess nitrate in the return sludge will adversely affect the anaerobic zone;

[0006] Second, the effluent of the aerobic pool has less biochemically applicable organic matter, which will lead to insufficient carbon sources for denitrification in the anoxic pool, and the denitrification effect will be adversely affected;

[0007] Third, in order to obtain better nitrogen and phosphorus removal effects, a larger reflux ratio is usually required, resulting in higher investment and energy consumption. Therefore, the nitrogen and phosphorus removal effects of many AAO processes in actual operation are not very good

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