TREATMENT OF SULFATE WASTEWATER BY SULFATE-REDUCING BACTERIA WITH RESIDUAL SLUDGE THERMAL ALKALINE-HYDROLYSATE AS CARBON SOURCE
This study aimed at the problem of insufficient carbon sources during the treatment of sulfate wastewater and explored the feasibility of using the alkaline-thermal hydrolysate of residual sludge as the carbon source of sulfate-reducing bacteria(SRBs).Batch experimental results showed that the optimum sludge pretreatment conditions were T=70 ℃,initial pH=13 and t=10 h,and the optimal parameters for SO42-removal by SRBs were ρ(COD)=10000 mg/L,ρ(SO42-)=2500 mg/L,initial pH=7,and T=35 ℃.Under this condition,the removal efficiency of SO42-reached 90％above,and the utilization efficiency of ρ(COD)reached 80％.The SO42-removal efficiency with sludge alkaline-thermal hydrolase was compared with four other SRBs common carbon sources(sodium lactate,sodium propionate,sodium acetate,and glucose),and the experiment showed that the removal efficiency of SO42-using sludge hydrolysate as SRBs carbon source was higher than other carbon sources.The research confirmed that the residual sludge alkaline-thermal hydrolysate can be used as the carbon source of SRBs,which provided favorable support for the treatment of SO42-wastewater and utilization of residual sludge.
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