Control of sulfide in aquaculture water by immobilized sulfur-oxidizing bacteria

In marine aquaculture habitats, large amounts of sulfides are produced due to the accumulation of organic matter and anoxic conditions, which seriously endanger the health of the aquaculture environment.For this purpose, a marine aquaculture system was established to adsorb immobilized sulfur-oxidizing strains with zeolite as a carrier, and the immobilized sulfur oxidizing bacteria bag was positioned and positioned to explore its control effect on the sulfides in the habitat and its influencing factors.The results showed that the viable bacteria content in the immobilized microbial agent was 1.9×10⁷ CFU/g, and the control effect on sulfides was greatly affected by the ambient temperature, pH, and dosage of the microbial inoculum, and the resistance to temperature and pH changes was better.The maximum removal rate of sulphide under experimental conditions of 30℃, pH 7.0, and 150 r/min was 8.3 mg/(g·h·L).In aquaculture environment, the zeolite immobilized microbial inoculum was laid in a geotextile bag and the cloth bag was laid flat on the central sediment-water interface of the culture system.The coverage was 2.5%.It was found that the immobilized microbial inoculant can significantly inhibit the vulcanization in the environment.The production of the substance controlled 99% of sulfides within 7 days under anoxic conditions.This study shows that the deployment of sulfur oxidizing bacteria at fixed points can control sulphides in aquaculture waters and provide data support for its application in marine aquaculture systems.