In the process of wastewater treatment, the main rivers and lakes in China are seriously eutrophic due to phosphorus pollution. In order to control phosphorus pollution, the State Environmental Protection Agency has formulated stricter standards for phosphorus discharge. 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 phosphorus removal and biological phosphorus removal, and generates volatile organic acids 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 the activated sludge and return it to the biological system, so that the biological wastewater treatment system can work in a high-efficiency phosphorus removal state; At the same time, phosphorus released by sludge under anaerobic conditions is eliminated by chemical phosphorus removal. This is an efficient municipal sewage treatment technology, which meets the requirements of further phosphorus removal on the basis of conventional secondary sewage treatment in order to solve the eutrophication of water bodies in China at present.
2. Circulating intermittent aeration sewage treatment process
China's economic development level varies greatly from place to place, and cities with backward economic development can't 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 fully takes advantage of the high treatment efficiency of high-load oxidation ditch and the good effluent of sequencing batch activated sludge sewage treatment process, which ensures that the effluent of the system meets the requirements of the first-class national sewage discharge standard in removing organic pollutants. Compared with the two-stage biological sewage treatment system, which usually removes organic pollutants, the investment and operation cost are reduced by about 3%, which is a process technology suitable for sewage treatment in China at this stage.
3. rotary contact oxidation sewage treatment process
rotary contact oxidation sewage treatment process is a new generation of aerobic biofilm treatment technology based on biological turntable technology and combined with 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 in the whole sewage treatment system is the only rotating part. Once the machine breaks down, the general mechanical personnel can carry out maintenance. The biomass of the system will be automatically compensated according to the change of organic load. The microorganisms attached to the turntable are alive. When the organic matter in sewage increases, the microorganisms increase. On the contrary, when the organic matter in sewage decreases, the microorganisms decrease. Therefore, the working effect of this sewage treatment system is not easily affected by sudden changes in flow and load and power failure. The operation cost is low, which is only 1/8 to 1/3 of that of other aeration sewage treatment systems. The occupied area is only half that of the conventional 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.
4. Continuous Cycle Aeration System process
continuous cycle aeration system is a continuous influent SBR aeration system. CCAS is an improved sewage treatment process based on SBR(Sequencing Batch Reactor). CCAS sewage treatment process has low requirements for sewage pretreatment, and only mechanical grille and grit chamber with a gap of 15mm are set. The core of biological treatment is CCAS reaction tank, in which the functions of phosphorus removal, nitrogen removal, degradation of organic matter and suspended matter are all completed, and the effluent can meet the standard.
6. Unique advantages of CCAS in sewage treatment process:
(1) When aerated, the sewage and sludge treated by CCAS are in a completely ideal mixed state, which ensures the removal rate of BOD and COD, and the removal rate is as high as 95%.
(2) The repeated operation modes of "aerobic-anoxic" and "aerobic-anaerobic" strengthen the phosphorus absorption and nitrification-denitrification, so that the removal rate of nitrogen and phosphorus can reach more than 8%, and the effluent index is qualified.
(3) During precipitation, the whole CCAS reaction tank is in a completely ideal precipitation state, and the effluent suspended matter is extremely low, and the low value also ensures the phosphorus removal effect.