Investigation of colloidal biogenic sulfur flocculation:Optimization using response surface analysis  

作　　者：Fan Chen Ye Yuan Chuan Chen Youkang Zhao Wenbo Tan Cong Huang Xijun Xu Aijie Wang 

机构地区：[1]State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology [2]Key Laboratory of Environmental Biotechnology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences

出　　处：《Journal of Environmental Sciences》2016年第4期227-235,共9页环境科学学报（英文版）

基　　金：supported by the National High-Tech Research and Development Program(863)of China(No.2011AA060904);the National Science Foundation for Distinguished Young Scholars(No.51225802);the Science Fund for Creative Research Groups of the National Natural Science Foundation of China(No.51121062);the National Key Technology Research and Development Program of the Ministry of Science and Technology of China(No.2010BAC67B02);the Fundamental Research Funds for Central Universities(No.AUGA5710055514);the National Natural Science Foundation of China(Nos.51176037,1308147,51308147 and 51408591)

摘　　要：The colloidal properties of biogenic elemental sulfur（S^0）cause solid–liquid separation problems,such as poor settling and membrane fouling.In this study,the separation of S^0 from bulk liquids was performed using flocculation.Polyaluminum chloride（PAC）,polyacrylamide（PAM）and microbial flocculant（MBF）were compared to investigate their abilities to flocculate S^0 produced during the treatment of sulfate-containing wastewater.A novel approach with response surface methodology（RSM）was employed to evaluate the effects and interactions of flocculant dose,pH and stirring intensity,on the treatment efficiency in terms of the S^0 flocculation and the supernatant turbidity removal.The dose optimization results indicated that the S^0 flocculation efficiency decreased in the following order PAC〉MBF〉PAM.Optimum S^0 flocculation conditions were observed at pH 4.73,a stirring speed of 129 r/min and a flocculant dose of 2.42 mg PAC/mg S.During optimum flocculation conditions,the S^0f locculation rate reached 97.53%.Confirmation experiments demonstrated that employing PAC for S^0 flocculation is feasible and RSM is an efficient approach for optimizing the process of S^0 flocculation.The results provide basic parameters and conditions for recovering sulfur during the treatment of sulfate-laden wastewaters.The colloidal properties of biogenic elemental sulfur（S^0）cause solid–liquid separation problems,such as poor settling and membrane fouling.In this study,the separation of S^0 from bulk liquids was performed using flocculation.Polyaluminum chloride（PAC）,polyacrylamide（PAM）and microbial flocculant（MBF）were compared to investigate their abilities to flocculate S^0 produced during the treatment of sulfate-containing wastewater.A novel approach with response surface methodology（RSM）was employed to evaluate the effects and interactions of flocculant dose,pH and stirring intensity,on the treatment efficiency in terms of the S^0 flocculation and the supernatant turbidity removal.The dose optimization results indicated that the S^0 flocculation efficiency decreased in the following order PAC〉MBF〉PAM.Optimum S^0 flocculation conditions were observed at pH 4.73,a stirring speed of 129 r/min and a flocculant dose of 2.42 mg PAC/mg S.During optimum flocculation conditions,the S^0f locculation rate reached 97.53%.Confirmation experiments demonstrated that employing PAC for S^0 flocculation is feasible and RSM is an efficient approach for optimizing the process of S^0 flocculation.The results provide basic parameters and conditions for recovering sulfur during the treatment of sulfate-laden wastewaters.

关 键 词：Elemental sulfur Flocculation Optimization Response surface methodology （RSM） 

分 类 号：X703[环境科学与工程—环境工程]