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Treatment of high-salt wastewater-salt-tolerant COD bacteria

Time : 2020-10-16

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Treatment of high-salt wastewater-salt-tolerant COD bacteria
According to the "Water Quality Standard for Sewage Discharged into Urban Sewers" (CJ-343-2010), when entering the sewage treatment plant for secondary treatment, the quality of the sewage discharged into the urban sewer should meet the requirements of Grade B, of which the chloride 600mg/L, Sulfate 6000 mg/L.

According to "Outdoor Drainage Design Code" (GBJ 14-87) Appendix III "Allowable Concentration of Harmful Substances in the Influent of Biological Treatment Structures", the allowable concentration of sodium chloride is 4000mg/L.

According to project experience, it is believed that the salinity in biochemical treatment should not be higher than 6000mg/L, short-term shock should not be higher than 8000mg/L, and special circumstances should not be higher than 10000mg/L.

What are the effects of salt on wastewater treatment?

1. Lead to dehydration and death of microorganisms.

      In the case of high salt concentration, the change in osmotic pressure is the main cause. The inside of the bacteria is a semi-closed environment. It must exchange beneficial substances and energy with the external environment in order to maintain its vitality, but it must also prevent most of the external substances from entering to avoid the internal biochemistry. Interference and obstruction of reaction.

      The increase in salt concentration causes the concentration of the bacteria's internal solution to be lower than that of the outside world, and because of the characteristics of water moving from low concentration to high concentration, a large amount of water loss in the bacteria body causes changes in the internal biochemical reaction environment, and ultimately destroys the biochemical reaction process until it is interrupted , Resulting in the death of bacteria.

2. Interfere the absorption process of microbial substances and block death.

      The cell membrane has the characteristic of selective permeation to filter the harmful substances to the life activities of bacteria and absorb the substances beneficial to their life activities. This absorption process is directly affected by the solution concentration and material purity of the external environment, and the addition of salt causes the bacteria's absorption environment to be disturbed or blocked, and eventually causes the bacteria's vitality to be inhibited or even die. This situation differs greatly due to individual bacteria, species, salt types and salt concentrations.

3. Poisoning and death of microorganisms.

      Some salt will enter the bacteria with the life activities of the bacteria, destroying the internal biochemical reaction process, and some will interact with the bacterial cell membrane, causing its nature to change and no longer protect or absorb some of the bacteria. Beneficial substances, which in turn lead to the inhibition of the vitality of bacteria or the death of bacteria. Among them, heavy metal salts are the representative, and some sterilization methods use this principle.

Studies have shown that the impact of high salinity on biochemical treatment is mainly reflected in the following aspects:

1. With the increase of salinity, the growth of activated sludge is affected. The changes in its growth curve are manifested in: the adaptation period becomes longer; the growth rate in the logarithmic growth period becomes slower; the deceleration growth period becomes longer.

2. Salinity enhances the respiration of microorganisms and the lysis of cells.

3. Salinity reduces the biodegradability and degradability of organic matter. Decrease the removal rate and degradation rate of organic matter.

For high-salt wastewater, Markinggreen environmental protection Micro Boost® series-salt-tolerant COD bacteria Micro Boost®-Salt can improve the COD removal efficiency of high-salt wastewater and increase the processing load of the sewage biochemical system.

product description

      Micro Boost® series-salt-tolerant COD bacteria, Micro Boost®-Salt is a biological agent specially developed for high-salt wastewater treatment. This product is composed of bacilli and cocci that can form spores (endospores) screened by nature, and can maintain normal activity when the total salt content is not more than 3%. It is widely used in industrial sewage with high chloride and high sulfate. This product is very helpful for shortening the startup time of the system, increasing the processing load by 10%-20% without increasing the hardware, improving the sludge sedimentation, and solving the rapid recovery of the system from impact.