The general principles are: technology reform, pollution reduction, recycling, comprehensive prevention and control, advanced technology, economy and rationality. In the process selection, we should pay attention to the overall optimization, rather than just pursuing the optimization of a certain link.
job operation
1, biological phosphorus removal
In the process of economic development, due to phosphorus pollution, the eutrophication of major rivers and lakes in China is serious. In order to control phosphorus pollution, the State Environmental Protection Agency has formulated stricter phosphorus emission standards. Chemical enhanced biological phosphorus removal wastewater treatment process is mainly to remove organic pollutants and various forms of phosphorus in wastewater. This wastewater treatment process integrates chemical dephosphorization and biological dephosphorization. Volatile organic acids are produced by anaerobic digestion of activated sludge in biological system, which are used as substrates or nutrients for the growth of phosphorus-accumulating bacteria, so that phosphorus-accumulating bacteria can selectively proliferate in activated sludge and return to the biological system, so that the biological wastewater treatment system can work in a high-efficiency dephosphorization state. At the same time, phosphorus released by sludge under anaerobic conditions is eliminated by chemical phosphorus removal. This is an efficient urban sewage treatment technology, which meets the requirements of further phosphorus removal on the basis of conventional secondary sewage treatment, so as to solve the problem of eutrophication of water bodies in China at present.
2. Circulation gap
The level of economic development in China varies greatly, so it is impossible for a city with backward economic development to spend a lot of money on sewage treatment. Therefore, how to use limited funds to reduce environmental pollution is a problem faced by many city governments. In terms of sewage treatment, until recently, some cities still adopted primary or primary enhanced treatment technology, and the effluent could not meet the requirements of national secondary discharge standards for removing organic pollutants.
The cyclic intermittent aeration process makes full use of the high treatment efficiency of high-load oxidation ditch and the good effluent of sequencing batch activated sludge wastewater treatment process, which ensures that the effluent of the system meets the requirements of the first-class national sewage discharge standard in terms of removing organic pollutants. Compared with the two-stage biological sewage treatment system that usually removes organic pollutants, the investment and operation cost are reduced by about 30%, which is a process technology suitable for sewage treatment in China at present.
3, rotating contact
Rotating contact oxidation wastewater treatment technology is a new generation of aerobic biofilm treatment technology based on biological turntable technology and combining the advantages of biological contact oxidation technology. Rotating contact oxidation sewage treatment technology and complete sets of equipment provide a simple and reliable sewage treatment method. The rotating shaft is the only rotating part in the whole sewage treatment system. Once the machine breaks down, the general mechanic can repair it.
The biomass of the system will be automatically compensated according to the change of organic load. Microorganisms attached to the turntable are alive. When organic matter in sewage increases, microorganisms increase. On the contrary, the organic matter in sewage is reduced and the microorganisms are reduced. Therefore, the working effect of this sewage treatment system is not easily affected by the sudden change of flow and load and power failure. The operation cost is low, which is only 1/8 ~ 1/3 of other aerated sewage treatment systems. The occupied area is only half that of the traditional activated sludge process. Because there are many kinds of microorganisms growing in the biological system, it can effectively treat all kinds of refractory industrial sewage.