Introduction to the Applicable Scope of Microbial Sewage Treatment Bacteria

Microbial sewage treatment bacteria have the characteristics of rapid reproduction, strong vitality, safety and non-toxic. Microbial bacteria reproduce through the consumption of organic pollutants in water, which has a good removal effect on organic pollutants in sewage, reduces the damage of organic pollutants to the natural food chain of water, and avoids the occurrence of natural pollution of water that people drink. Microbial sewage treatment bacteria can effectively eliminate the odor problem, prevent the breeding of pathogenic bacteria mosquitoes and flies, and solve the problem of water pollution.

Main classification
1. Nitrifying bacteria: nitrifying bacteria are aerobic bacteria. In the wastewater treatment process, they mainly exist in aerobic tanks or contact oxidation tanks. Aeration equipment will be added in the tanks to provide sufficient oxygen for the consuming bacteria, so as to obtain electrons in the process of nitrification to remove ammonia nitrogen (NH3-N). Nitrating bacteria reduce the ammonia nitrogen in wastewater and convert it into nitrite nitrogen and then into nitrate, To some extent, it can form original cooperative relationship with denitrifying bacteria.
2. Denitrifying bacteria: denitrifying bacteria mainly remove nitrogen from the mixed solution returned from the aerobic tank in the environment where the dissolved oxygen in the anoxic water is less than 0.5mg/L and the PH is between 6-9. The high total nitrogen in wastewater is related to the lack of microorganisms in the anoxic tank to some extent, and is also related to the carbon source in the sewage. The carbon source reductant used by the denitrifying bacteria obtains electrons during the denitrification process. Denitrifying bacteria are mostly heterotrophic and facultative anaerobic bacteria, such as denitrifying bacteria, Shigella, Chaetobacterium perfringens, etc. Under xenon conditions, they use oxygen in nitric acid to oxidize organic substances and obtain energy required for their own life activities.
3. Compound sewage treatment bacteria: The compound bacteria are mainly used to start the new sewage system and help the sewage biochemical tank to rapidly cultivate microbial species. The compound bacteria is a compound bacteria family consisting of 6 genera and more than 50 kinds of bacteria, which can adapt to different water quality environments. The compound bacteria have a wide range of applications, such as COD, BOD, ammonia nitrogen, and total nitrogen degradation. The bacteria mainly include nitrifying bacteria, denitrifying bacteria, bacillus Pseudomonas and other nutrients such as activating enzymes and polysaccharides. The composite bacteria is a solid powder, which is made into dry powder by using the dry freezing penalty to make the bacteria in a dormant state. The composite bacteria have strong adaptability and impact resistance. The stability of the biochemical tank is also good after the bacteria are cultivated. It also has a certain removal ability for complex industrial chemical wastewater that exceeds the standard. The salt tolerance of the bacteria after domestication can reach 2%.

4.COD degradation bacteria: COD degradation bacteria are mainly used to degrade COD indicators in sewage biochemical tank. It mainly degrades COD in wastewater, improves water quality chromaticity, increases sludge floc particles, adjusts sludge floc structure, and inhibits algae growth. When the concentration of organic matter in sewage biochemical tank is too high or the dissolution ratio of the biochemical tank is small, the high load sewage inflow is easy to impact the microorganisms in the biochemical tank. For the high concentration COD indicators of the pretreated sewage, some COD degradation bacteria can be properly added in the process of cultivating bacteria in the biochemical tank, which can effectively remove the COD indicators and better stabilize the biochemical system.

Advantages of sewage bacteria
1. Short culture cycle: the biological contact oxidation method can quickly form the membrane for 2-3 days. The strain aerobic tank attached to the filler is yellowish brown. When touching with hands, you can feel the same sticky feeling as nasal mucus. At the same time, the amount of sludge produced is small, so you do not need to discharge sludge frequently. The sludge discharge cycle varies from half a month to one month; With the activated sludge method as the attachment point, and then adding solid powder bacteria, the culture cycle of using activated sludge alone can be shortened to about half.
2. Wide treatment range: solid powder microbial strains can effectively remove BOD, COD, SS, ammonia nitrogen and total nitrogen indicators in wastewater. Bacteria have limited treatment of total phosphorus. Total phosphorus removal is mainly related to the structure of wastewater treatment process.
3. Strong stability: the biochemical tank of sewage not only needs a fast culture cycle, but also is important for the new stable operation in the later period.
4. Strong adaptability: solid powder bacteria have strong adaptability to high and low water quality. The bacteria with high concentration COD index added with solid powder can also cultivate or degrade the organics in sewage.
5.It has remarkable deodorization effect, and has strong ability to eliminate NH3, P, H2S and organic acids.
6.. Simple feeding: the bacteria and sludge are dissolved and added into the biochemical tank at a ratio of 10:1, and then the aeration is opened for cultivation. The technical requirements for operators can be ignored.
7. Strong reproductive capacity: the cycle of the third generation of bacteria from the first generation to the second generation is very short, and the resilience to the impact of high load water quality is also relatively strong.
8. Inhibit viruses, germs and parasites.
9. Inhibit the propagation of algae and purify the water body and color.
10. Low concentration heavy metal pollution, such as zinc, manganese, iron and chromium, can also be removed.
11. Sewage treatment bacteria series are easy to cultivate, reproduce quickly, have strong adaptability to the environment, natural evolution and other characteristics. Once new pollution compounds appear, they can also gradually generate new enzyme systems through spontaneous or induction, with new metabolic functions, so as to degrade or transform new compounds.

Usage Method
Close the water inlet and outlet valves of the biochemical tank. If there is stirring in the anoxic tank, the stirring device needs to be turned on. The aeration equipment of the aerobic tank needs to pre aerate for 2 hours in advance, so that the dissolved oxygen in the water can reach 2-4mg/L, and the anaerobic (anoxic) dissolved oxygen can be controlled below 0.5mg/L; It is better to control the PH of biochemical tank between 6-9 and aerobic tank between 7-8.5. It is recommended to control the temperature in the biochemical tank between 10 ° - 35 °.
The solid powder bacteria shall be dissolved in the sewage of the biochemical tank before being added. The ratio of bacteria to water is 1:10. The dissolved bacteria shall be added into the aerobic and anoxic tanks that have been stirred and aerated before.
The organic matter in the water is limited two days after the inlet and outlet water is closed, and a large amount of organic matter needs to be consumed in the process of bacterial reproduction. Nutrient sources, such as glucose, urea and dihydrogen phosphate, are artificially added externally.
Continuous aeration for 24 hours enables microorganisms to activate, attach to the bacterial bed and reproduce to reach an active state.
It is recommended to adjust the water inflow in stages to reduce the impact on the cultivated bacteria. On the first day of operation, open 1/5 of the normal water inflow, the second day is 2/5 of the normal water inflow, and the third day is 3/5 of the normal water inflow. The fourth day is 4/5 of the normal inflow, and the fifth day is the normal inflow and outflow.


Action Mechanism
Aerobic microorganism sewage treatment bacteria use dissolved oxygen (DO) in water to decompose organic pollutants into water and carbon dioxide, or convert them into nutrients of sewage treatment microorganisms, and use these nutrients for reproduction. The process can just degrade pollutants to achieve the purpose of decontamination and deodorization. This treatment method is called aerobic treatment, and the activated sludge method is the most widely used.
The general anaerobic sewage treatment microorganism is used to reduce nitrate (using the oxygen in nitrate) in the absence of dissolved oxygen to conduct denitrification reaction to generate nitrogen, which is widely used for wastewater treatment containing nitrogen. The acid producing bacteria (general Anaerobic Microorganisms) are commonly used in the early acidification reaction of the absolute anaerobic microorganism wastewater treatment process.
Absolute anaerobic biological treatment is to use acid producing bacteria to conduct acidification reaction, and decompose carbohydrate or protein in sewage into monosaccharides, amino acids or low-grade fatty acids (organic acids). Then acetic acid producing bacteria (absolute Anaerobic Microorganisms) are used to decompose monosaccharides, amino acids or organic acids in sewage into acetic acid. Finally, methanogens (absolute anaerobic microorganisms) are used to decompose acetic acid to generate methane.
Most wastewater treatment microorganisms feed on pollutants, such as carbohydrates, proteins, fats and other pollutants, which can be decomposed by various wastewater treatment microorganisms to become nutrients for their own growth and reproduction. The use of photosynthetic bacteria and Bacillus can transform the odor gas hydrogen sulfide into sulfur element needed for its own growth, thus achieving the purpose of deodorization.
The polysaccharide viscous substances of microbial wastewater treatment bacteria can be used to adsorb pollutants in the environment, which is often used to adsorb heavy metal ions.
When Candida spp. enters the sewage through special microbial sewage treatment bacteria, it will become the dominant bacteria in the environment and can inhibit the growth of pathogenic bacteria and putrefactive bacteria. For example, when lactic acid bacteria become the dominant bacteria, it can inhibit the growth of coliform bacteria in the environment, thus reducing the generation of ammonia and other odors.


Adaptive Object
It is mainly used for Biochemical treatment of all sewage treatment systems. Sewage treatment plant (secondary treatment system); Livelihood sewage treatment in communities and plant areas; Sewage treatment equipment in schools and public areas; Sewage treatment of lakes and rivers; Industrial wastewater (electroplating, bleaching and dyeing, water washing, garment making, slaughterhouse, tannery, starch factory, brewery, paper mill), etc.

Scope of Application
Sewage treatment, domestic sewage treatment, textile plant wastewater treatment, chemical plant wastewater treatment, steel plant wastewater treatment, coking wastewater treatment, oil plant wastewater treatment, wastewater treatment, industrial wastewater treatment, printing and dyeing wastewater treatment, phosphating wastewater treatment, electroplating wastewater treatment, pharmaceutical wastewater treatment, etc.

Functional effects
1. It can avoid the secondary pollution caused by chemical treatment, reduce the amount of sewage produced, improve the quality of sewage, and reduce the cost of sewage treatment.
2. It can improve the ability of the system to resist the impact load, so as to cope with the excessive organic load
3. It can improve the removal rate of organic matters and significantly reduce the degradation products of anaerobic pond to recover HRT.
4. It can reduce odor release, inhibit the growth of putrefactive bacteria, and reduce the production of biogas, ammonia and hydrogen sulfide.
5. It can reduce or eliminate foam caused by undissolved fatty acids in the effluent.
6. Inhibit the propagation of pathogenic microorganisms and prevent the occurrence of diseases.