Unpowered internal circulation biochemical reaction settling tower and workflow thereof

Abstract

The invention discloses an unpowered internal circulation biochemical reaction settling tower and a workflow thereof. The unpowered internal circulation biochemical reaction settling tower includes ananoxic reaction zone, an aerobic reaction zone, a settling zone, an internal circulation system, a water intake pump and an aeration fan. The bottom of the anoxic reaction zone is provided with a perforated water distribution pipe, the aerobic reaction zone is internally equipped with aeration devices and suspended filler from the bottom up, the settling zone includes sludge hoppers, inclined plate areas, a clear water area and effluent weirs, the internal circulation system includes a gas-liquid separation tank, a raising pipe, a reflux pipe and a gas collecting hood, and the anoxic reactionzone, the aerobic reaction zone and the settling zone are arranged from the bottom up, the water intake pump is communicated with the perforated water distribution pipe, the aeration fan is communicated with the aeration devices, the slope sides of the gas collecting hood and the slope sides of the sludge hoppers are staggered to form water seams, the gas collecting hood is communicated with thegas-liquid separation tank through the raising pipe, and the gas-liquid separation tank is communicated with the bottom of the anoxic reaction zone through the reflux pipe. The unpowered internal circulation biochemical reaction settling tower provided by the invention has the advantages of small floor area, low energy consumption, good removal effect of organic matters and total nitrogen, strongimpact resistance and the like.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an unpowered internal circulation biochemical reaction sedimentation tower and its working process. Background technique [0002] The anoxic-aerobic denitrification process is a conventional sewage treatment process. In this process, the anoxic pool is set in front of the aerobic pool. The denitrifying bacteria in the anoxic pool use the organic matter in the sewage as a carbon source to perform denitrification. The mixed liquid in the aerobic pool contains a large amount of nitrate, which is returned to the anoxic pool through internal circulation. In the prior art, the horizontal combination mode of anoxic tank, aerobic tank and sedimentation tank is usually adopted, and power equipment such as a reflux pump is used in the internal circulation to realize the reflux of nitrifying liquid from the aerobic tank to the anoxic tank, so the occupied area is relatively large , higher e...

AI Technical Summary

Problems solved by technology

However, since this air lift method shares the same aeration fan with the aerobic tank aeration, it is difficult to control the air intake, and it will affect the aeration and oxygen supply of the aerobic tank; in addition, in order to ensure a large air lift return flow , the air volume of the aeration fan needs to be much larger than that of aeration alone, resulting in a significant increase in energy consumption

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