Internal circulation type sewage treatment oxidation ditch

Abstract

The invention provides an internal circulation type sewage treatment oxidation ditch, belonging to the technical field of sewage treatment. The internal circulation type sewage treatment oxidation ditch of the invention overcomes the problems that conventional oxidation ditches are poor in nitrogen and phosphorus removal effect and low in effluent discharge standard, and effectively improves removal efficiency of chemical oxygen demand. The internal circulation type sewage treatment oxidation ditch comprises an anaerobic zone, an anoxic zone, an aerobic zone and an internal circulation controlgate, wherein the anaerobic zone is connected with the anoxic zone, and a water inlet is formed in the joint of the anaerobic zone and the anoxic zone; the anoxic zone is connected with the aerobic zone, and a circulation channel and a backflow channel are formed in the joint of the anoxic zone and the aerobic zone; and the internal circulation control gate is arranged on the backflow channel. The internal circulation type sewage treatment oxidation ditch is mainly used for sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to an internal circulation sewage treatment oxidation ditch. Background technique [0002] The traditional oxidation ditch process does not return the reflux liquid to the anoxic section, and cannot make the nitrification liquid flow back to the anoxic section for denitrification. In view of the fact that most of the chemical oxygen demand of organic matter has been removed in the anaerobic section in most oxidation ditch operations, even if the nitrification liquid flows back to the anoxic section, the carbon source is not enough to support effective denitrification. The measured data in the actual operation shows that the chemical oxygen demand of organic matter has been reduced to close to the water quality required by the effluent in the anoxic section. The chemical oxygen demand of organic matter in the water is low, but the total nitrogen is high, and the carbon sourc...

AI Technical Summary

Problems solved by technology

[0002] The traditional oxidation ditch process does not return the reflux liquid to the anoxic section, and it is impossible to return the nitrification liquid to the anoxic section for denitrification reaction

In view of the phenomenon that most of the chemical oxygen demand of organic matter has been removed in the anaerobic section in the operation of most oxidation ditches, even if the nitrification liquid is returned to the anoxic section, the carbon source is not enough to support effective denitrification

The measured data in the actual operation shows that the chemical oxygen demand of organic matter has been reduced to close to the water quality required by the effluent in the anoxic section. The chemical oxygen demand of organic matter in the water is low, but the total nitrogen is high, and the carbon source cannot meet the requirements of denitrification reaction. demand, and the dissolved oxygen in the anoxic section is high, resulting in very little removal of total nitrogen

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