What are the bacteria in sewage treatment？
The varieties of pollution sources in modern industrial sewage are quite complex. In order to achieve the purpose of degrading the pollutants in the sewage, a series of researches on the microbial bacteria that degrade the sewage are carried out to obtain the sewage treatment bacteria with salt resistance, impact resistance and strong stability. Effectively remove ammonia nitrogen, BOD, COD, SS, nitrate, sulfate, chroma, odor, toxic substances, compound pollutants, etc. The sewage can effectively degrade various pollutants in the water through the front-end pretreatment, and then through the biochemical anaerobic and aerobic stages.
Sewage treatment bacteria are divided into the following categories according to their functions:
1. Nitrifying bacteria: It is a kind of aerobic bacteria, including nitrous bacteria and nitrifying bacteria, and plays an important role in the process of nitrogen cycle water purification. Extensive in all corners of nature, air, rivers, sea, soil, there are thousands of nitrifying bacteria found in biology.
2. Denitrifying bacteria: Denitrifying bacteria are bacteria that can cause denitrification. Most of them are heterotrophic and facultative anaerobic bacteria, such as denitrifying bacteria, Staphylococcus spp. Under the condition of xenon, they use the oxygen in nitric acid to oxidize organic substances to obtain the energy required for their own life activities. Denitrifying bacteria are widely distributed in soil and sewage. Capable of converting nitrate nitrogen to nitrogen gas instead of ammonia nitrogen. It is mainly used in sewage treatment, such as landscape water management, urban river management, aquaculture treatment, etc.
3. Nitrification and denitrification compound strains: compound strains with dual effects of nitrification and denitrification, in the case of increasingly complex sewage treatment environment, it is more and more difficult to use nitrifying or denitrifying strains alone to achieve the balance of strains.
4. COD degrading bacteria: COD degrading bacteria are mainly used in the application of COD degradation indicators in sewage biochemical pools. First, degrade COD in wastewater, improve water quality color, increase sludge floc particles, adjust sludge floc structure, and suppress algae growth. When the concentration of organic matter in the sewage biochemical tank is too high or the volume of the biochemical tank is small, the inflow of high-load sewage will easily have an impact on the microorganisms in the biochemical tank. For the high-concentration COD index of the sewage after pretreatment, in the process of cultivating bacteria in the biochemical tank, some COD-degrading bacteria can be appropriately added, which can effectively remove COD and better stabilize the biochemical system.
The advantages of sewage treatment bacteria
1. Short cultivation cycle: the biological touch oxidation method can quickly form the film, and the amount of sludge is small; the activated sludge method uses the sludge as the attachment point, and then adds solid powder bacteria, which can greatly shorten the cycle. .
2. Wide range of treatment: solid powder microbial strains can effectively remove BOD, COD, SS, ammonia nitrogen, total nitrogen and other indicators in wastewater.
3. Strong stability: The strain is very important for the new stable operation in the later stage.
4. Strong adaptability: solid powder bacteria have strong adaptability to water quality load.
5. Remarkable deodorizing effect: strong ability to eliminate NH3, P, H2S and organic acids.
6. Simple operation: the bacteria and sludge are dissolved and added to the biochemical tank in a 10:1 ratio for aeration cultivation.
7. Strong reproductive capacity: The bacteria species reproduce from the first generation to the second generation, and the cycle of the third generation is very short, and the ability to recover from the impact on high-load water quality is relatively strong.
8. Effectively remove viruses, germs and parasites. Inhibit algae reproduction, purify water and reduce chroma.
9. Can remove low-concentration heavy metal pollution, such as zinc, manganese, iron, etc.
10. Easy to cultivate, multiply quickly, sewage treatment bacteria have strong adaptability and evolution ability to the environment. For new pollutants, they can spontaneously or induce new enzymes to degrade or transform new compounds.
11. Sewage treatment strains are strict. According to national standards, R&D and production are adopted, and the effect is remarkable. For sewage treatment, the time is fast, the cycle is short, and the number of bacteria is high. Sprinkle it in the water, and it will not be taken away by the water flow.
