Removal of AVS Pollution in River by Sulfur Oxidizing Bacteria Immobilized on Water Purification Sludge
In this study,sulfur oxidizing bacteria immobilized on water purification sludge to remove Acid Volatile Sulfide(AVS)in a river channel was studied.There were three immobilized carriers.One was made of water purification sludge by high temperature calcination.Other two immobilized carriers were green zeolite and activated carbon.Three immobilization bodies were prepared by commercially available sulfur oxidizing bacteria immobilized on above three carriers were characterized by XRD,SEM and BET.The performances and influence factors of the above three immobilization bodies on AVS removal were analyzed.At the same time,the effect of the immobilization bodies on changes in microbial populations in sediments was analyzed by high-throughput sequencing technology.The results showed that the optimal roasting temperature of the water purification sludge carrier was 600℃,and its AVS removal effect was best among three carriers.The AVS removal effect of its immobilization body was best among three immobilization bodies.The optimal conditions for the immobilization body were temperature of 30℃,pH of 6,and immobilization time of 24h.Immobilization of sulfur oxidizing bacteria on water purification sludge facilitates the aggregation of dominant sulfide-degrading bacteria and inhibits the growth and reproduction of sulfate-reducing bacteria.So immobilized sulfur oxidizing bacteria in water purification sludge can effectively remove AVS pollution in a river channel and improve the black and odor environment of sediment.
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