Magnetic coagulation clarification tank and BAF combined process with effluent indexes reaching ground surface IV-type water standard

Abstract

The invention relates to a magnetic coagulation clarification tank and BAF combined process with effluent indexes reaching ground surface IV-type water standard; and the combined process comprises thefollowing steps: a coarse grating and a primary lift pump room module perform primary filtration and sewage lifting, a fine grating and an air-stripping grit chamber perform secondary filtration andsand removal, and PAC, magnetic powder and PAM are added into a magnetic coagulation clarification tank module; then, secondary filtering and sewage lifting are carried out through a fine grid and a secondary lifting pump room module to increase a water head; a primary biological aerated filter module decomposes COD, BOD and NH3-N in the sewage; and a secondary biological aerated filter module performs nitration reaction by utilizing NH3-N in the sewage. The process is used for treating low-concentration town sewage and can reach the ground surface IV-type water standard; the two stages of lifting pump stations reduce the engineering construction difficulty; and 20%-30% of effluent of the biological aerated filter N flows back to the front end of the magnetic coagulation clarification tank, so that the phosphorus removal effect is enhanced, and the removal of COD and NH3-N is enhanced.

Description

technical field [0001] The invention relates to the technical field of urban sewage treatment, in particular to a combined process of a magnetic coagulation clarifier and a BAF whose effluent index reaches surface water IV. Background technique [0002] In recent years, my country's economy has developed rapidly, and pollution has become more and more serious, facing the problems of economic development and ecological environment protection. Therefore, in response to the problem of water pollution, the treatment efforts have been increased unprecedentedly, the standards have been raised repeatedly, and the effluent of urban sewage treatment is implemented as surface IV water. [0003] At present, the overall deterioration of my country's environmental conditions has not been fundamentally curbed, environmental contradictions are prominent, and the pressure continues to increase. Water pollution in some key river basins and sea areas is serious, atmospheric haze is prominent...

AI Technical Summary

Problems solved by technology

[0006] For the problems existing in the above technologies, such as: COD3 -N: 20-25mg / L, TP: 2-5mg / L in this concentration range, the existing process cannot be treated efficiently and at low cost, because the existing processes are all set up for high pollution concentration sewage , the sewage treatment of this process ignores the regional needs. Although it can also purify low-concentration polluted urban sewage, the treatment efficiency is relatively low, and the natural operating cost will become higher. At the same time, for NH 3 -N and TP are difficult to purify completely; therefore, the objective conditions of regional factors and urban sewage concentration differences should be considered, and the process can be adapted to different concentrations of sewage for treatment, which can not only meet the sewage treatment standards, but also reduce the cost to the greatest extent , the material utilization rate is improved

Images