Sewage treatment method and system

Abstract

The invention discloses a sewage treatment method and a sewage treatment system, and belongs to the field of sewage treatment. With adoption of the method, a sewage pre-treatment unit, a secondary biological treatment unit and an advanced treatment unit which are sequentially connected are adopted, the method comprises the following steps: pretreatment: allowing the to-be-treated sewage to enter the sewage pre-treatment unit, and filtering, floating in air or precipitating to remove suspended matters in the sewage; secondary biological treatment: allowing the pre-treated sewage to enter the secondary biological treatment unit, using A2 / O-MBR in a front oxygen deficit tank in the secondary biological treatment unit to remove COD (Chemical Oxygen Demand), ammonia nitrogen, and total nitrogen and phosphorus; and advanced treatment: allowing the effluent secondarily biologically treated to enter the advanced treatment unit, and directly discharging or recycling the effluent after disinfection. The pretreatment, the secondary biological treatment and the advanced treatment are matched, particularly, A2 / O-MBR in the front oxygen deficit tank in the secondary biological treatment effectively removes COD, ammonia nitrogen, and total nitrogen and phosphorus in the sewage, so that the phosphorus is removed while the denitrification effect is guaranteed, and the waste water treatment efficiency is improved.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a sewage treatment method and system. Background technique [0002] In recent years, the environmental problems caused by eutrophication of water bodies have become increasingly prominent, and the shortage of water resources and water environment pollution have become one of the important factors affecting the sustainable development of my country's economic society. During the "Twelfth Five-Year Plan" period, my country's water pollution reduction target will strengthen the control of ammonia nitrogen and total phosphorus on the basis of the original total COD control. Material Emission Standard "Class A Standard". [0003] Traditional A / O, A 2 / O, oxidation ditch and other sewage treatment processes have their own shortcomings, mainly due to the influence of these processes on the adjustment of factors such as sludge age, sludge concentration, carbon source, nitrate, etc., whic...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a sewage treatment method and system, which can realize the removal of phosphorus while improving the denitrification effect, and improve the efficiency of wastewater treatment, thereby solving the problem of existing sewage treatment. 2 Insufficient carbon source for denitrification in O-MBR process and mutual restriction between denitrification and phosphorus removal functions

Images