Sewage treatment method for bottom aeration oxidation ditch in cold region

Abstract

The invention relates to a sewage treatment method for a bottom aeration oxidation ditch in a cold region, and belongs to the technical field of sewage treatment in the environmental engineering discipline. On the basis of a series of experimental studies, when an oxidation ditch sewage treatment system is adopted in a severe cold region, a bottom aeration oxidation ditch system is adopted according to the characteristic of the cold region, and aeration equipment is formed by combining an underwater impeller propulsion device and a micropore aeration plate; meanwhile, a technical method in which the bottom aeration oxidation ditch system can be operated in an alternate composite anoxic / aerobic mode is constructed according to the aerobic / anoxic and pulsation inertia effect theory of biological sewage treatment to enhance treatment capacity and exert the maximum performance of the oxidation ditch treatment system. The method has the advantages of preventing the water temperature from being reduced, ensuring stable operation in winter and improving sewage treatment efficiency and the comprehensive water quality of effluent.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment in the discipline of environmental engineering, and in particular relates to a sewage treatment method for bottom aeration oxidation ditch in cold regions. Background technique [0002] The oxidation ditch sewage treatment process was successfully developed by the Dutch Institute of Sanitary Engineering in the 1950s. Since it was first put into use in the Netherlands in 1954, it has been widely used in the treatment of domestic and industrial sewage at home and abroad due to its technical characteristics such as good effluent quality, stable operation, and convenient management. Currently widely used oxidation ditch types include: Pasveer oxidation ditch, Carrousel oxidation ditch, Orbal oxidation ditch, T-type oxidation ditch (three-ditch oxidation ditch) , DE type oxidation ditch and integrated oxidation ditch, etc. Due to the differences in structure and operation, these oxidation di...

AI Technical Summary

Problems solved by technology

[0003] As the aeration equipment of the oxidation ditch process, mechanical aeration equipment is often used. At this time, the mechanical aeration equipment plays the role of oxygenation and push flow, and it is difficult to independently control the oxygenation amount and flow rate in actual operation.

Especially when the requirements for phosphorus and nitrogen removal are high, it is necessary to maintain a certain volume of anaerobic section in the reaction tank, but the mechanical aeration equipment needs a certain flow rate to prevent the sedimentation of activated sludge, which often easily causes excessive oxygenation, especially This state is more significant when the influent dissolved oxygen is high in rainy days, so that the ideal effect of phosphorus and nitrogen removal cannot be obtained.

In addition, if mechanical aeration equipment is used in sewage treatment plants located in cold regions, since low-temperature air is directly used as oxygenated gas, the water temperature will drop and affect the sewage treatment effect.