Air lift intermittent internal circulation denitrification dephosphorization sewage treatment process and apparatus

Abstract

The invention discloses an airlift intermittent internal recycling, de-nitration and dephosphorization sewage treatment technology and a device thereof; the sewage treatment technology comprises the steps: a biochemical tank is divided into an aeration area and a non-aeration area by a deflector; an aeration system is arranged at the bottom of the aeration area and internally provided with stuffing materials and membrane modules; the non-aeration area is internally provided with stuffing materials, and an inlet water pipe and a back-flush system are respectively arranged in the middle and thebottom of the non-aeration area; a mud guiding slope is arranged at the bottom of the non-aeration area, and a mud pipe is arranged at the bottom of the mud guiding slope; the running mode of intermittent water inflow and continuous water outflow is adopted, so that the liquid level of a reactor always changes between high liquid level and low liquid level, thus realizing that mixed solution can be periodically exchanged between the aeration area and the non-aeration area, and leading the aeration area to keep aerobic environment all the time so as to carry out aerobic nitrification reaction;the non-aeration area is in the alternating environment of anaerobic and anoxia so that anaerobic phosphorus release is carried out when no mixed liquid is cycling and that denitrifying phosphorus removal is carried out when the mixed liquid is cycling; and biological membranes in the non-aeration area carries out back washing regularly and excess sludge is discharged regularly from a mud pipe.

Description

technical field [0001] The invention relates to a sewage biochemical treatment process and device, belonging to the technical field of sewage treatment in the environmental protection industry. Background technique [0002] Biological treatment of sewage is recognized as a method that is economical to operate and widely used. The sewage denitrification and phosphorus removal processes developed according to the traditional denitrification and phosphorus removal principles can be divided into two categories: one is the multi-stage (multi-stage) activity that separates the anoxic (anaerobic) and aerobic environments in space. sludge process, such as A 2 / O process. The other is the sequential batch activated sludge SBR process that forms anoxic and aerobic sequences in time through the control of aeration and oxygen supply. Although the above processes play an important role in sewage treatment, there are still some problems: the multi-stage activated sludge process has man...

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Problems solved by technology

Although the above processes play an important role in sewage treatment, there are still some problems: the multi-stage activated sludge process has many treatment units, occupies a large area, requires sludge reflux and nitrifying liquid circulation, and has high power consumption; the SBR process adopts Multiple single devices operate alternately with water intake cycle, the utilization rate of equipment is low, various functional flora cannot carry out biochemical reactions in the whole process, and the overall biological efficiency is not high

At present, some denitrification and phosphorus removal processes have developed from basic research to engineering application stage, but both single sludge and double sludge processes have disadvantages such as relatively complicated process, many internal circulation systems, high investment and operating costs, etc.

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