Preparation method of salt-tolerant biological agent and adding method thereof

Abstract

The invention relates to the field of sewage treatment, in particular to a preparation method of a salt-tolerant biological agent and an adding method thereof. The salt-tolerant biological agent comprises a salt-tolerant efficient inoculant and a salt-tolerant efficient bacteria filler, the salt-tolerant efficient inoculant is prepared by mixing and compounding halotolerant bacteria O1 and halotolerant bacteria Y5, according to the salt-tolerant efficient bacteria filler, the salt-tolerant efficient inoculant is immobilized, and loaded on a polyurethane filler. The influence of the composite efficient halotolerant bacteria in different proportions on the removal effect of organic pollutants in sewage is recorded through experiments, so that the optimal configuration proportion of the O1 efficient halotolerant bacteria and the Y5 efficient halotolerant bacteria is explored, and the treatment effect is greatly improved no matter whether the salt-tolerant efficient composite inoculant orthe salt-tolerant efficient composite microbial filler is added; and the salt-tolerant high-efficiency composite bacteria filler has an obvious effect of maintaining TOC degradation efficiency.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a preparation method and a dosing method of a salt-tolerant biological bacterial agent. Background technique [0002] High salinity wastewater refers to wastewater with a total salt content of ≥ 1%. In addition to a large amount of inorganic salts, this type of wastewater usually also contains organic matter and a total dissolved solids (TDS) with a mass fraction of ≥ 3.5%. High-salt wastewater can be divided into high-salt domestic sewage, high-salt industrial wastewater, and other types (domestic sewage and operational wastewater from large ships, salty water caused by seawater leakage, and concentrated water generated when wastewater is minimized). salt water. my country is a country with serious shortage of water resources, and the per capita water resources are only 2500m3. Therefore, in recent years, some coastal cities have actively carried out the direct use of seawater ...

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Problems solved by technology

Dale et al. studied the use of biofilters to treat petrochemical wastewater containing high concentrations of salt and organic matter. The biofilm activity was inhibited by high concentrations of salts, resulting in a decrease in the removal rate of BOD5; Dincer et al. used a biological turntable system to treat wastewater with different salinities. The law of the COD removal rate changing with the salt concentration was studied, and the results showed that the COD removal rate decreased with the increase of the salt concentration, and when the salt concentration was 5%, the COD removal rate could be reduced to 65%; Cui Youwei et al. A feasibility study on the biological treatment of seawater flushing sewage was carried out by using the SBR process. The experiment simulated the salinity of seawater by adding NaCl. The research concluded that the NaCl mass concentration of 0.5% is beneficial to the growth of microorganisms, and the biological treatment NaCl mass concentration 2.5%, the treatment effect will deteriorate, and the effluent quality will not even meet the secondary discharge standard

In addition, during the start-up period of the biological treatment process, the domestication of the activated sludge has not been completed. Due to the high concentration of the activated sludge, the metabolic function of the microorganisms is destroyed, and the number of protozoa in the sludge is drastically reduced, resulting in a slow domestication of the sludge and a long time for the start-up of the process. Long, poor water quality during start-up

[0004] In the above studies, high-salt wastewater can significantly inhibit the activity of microbial treatment, resulting in the death of process sludge in normal operation and deterioration of effluent; the start-up process takes a long time and the removal rate is low during the start-up period

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