Combined process for enabling effluent COD, BOD5, NH3-N and TP indexes to reach ground surface IV-type water standard

Abstract

The invention relates to a combined process for enabling effluent COD, BOD5, NH3-N and TP indexes to reach ground surface IV-type water standard. The combined process comprises the following steps: acoarse screen and a primary lifting pump room module are used for carrying out primary filtration and sewage lifting; a fine grid and a gas stripping grit chamber module are used for filtering and removing sand again; a primary enhanced efficient clarification tank module is used for carrying out PAC and PAM sewage treatment reaction; a fine grid and a secondary lifting pump room module are used for filtering again and lifting the sewage to increase a water head; a primary biological aerated filter module decomposes COD, BOD and NH3-N in the sewage; a secondary biological aerated filter moduleperforms nitration reaction by utilizing NH3N in the sewage; and magnetic powder is added into a magnetic coagulation clarification tank module, sludge flows back, and tiny flocs wrap the magnetic powder, so that subsequent flocculation and sedimentation are facilitated. The process is suitable for low-concentration town sewage treatment, and reaches the ground surface IV-class water standard; and the two stages of lifting pump stations reduce the filling and excavation work amount during construction, and are particularly suitable for places with poor geological conditions.

Description

technical field [0001] The invention relates to the technical field of urban sewage treatment, in particular to a combined process whose effluent COD, BOD5, NH3-N, and TP indicators reach 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 in some regions a...

AI Technical Summary

Problems solved by technology

[0006] In view of the problems in the above technologies, such as: when the urban sewage is in the concentration range of COD<180mg / L, BOD<60, NH3-N: 20-25mg / L, TP: 2-5mg / L, the existing process cannot be efficient And low-cost treatment, because the existing processes are all set up for high-concentration sewage. The sewage treatment of this process ignores regional needs. Although urban sewage with low concentration pollution can also be purified, However, the treatment efficiency is relatively low, and the natural operating cost will become higher. At the same time, it is difficult to completely purify NH3-N and TP; therefore, regional factors and urban sewage concentration differences should be considered, so that the process can be adapted to different concentrations of sewage for treatment. , which can not only meet the standard of sewage treatment, but also reduce the cost to the greatest extent and improve the utilization rate of materials

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