Enhancing sludge dewatering is of importance in reducing environmental burden and disposal costs.In this work, a cationic surfactant, cetyl trimethyl ammonium bromide(CTAB), was combined with Fenton’s reagent for slu...Enhancing sludge dewatering is of importance in reducing environmental burden and disposal costs.In this work, a cationic surfactant, cetyl trimethyl ammonium bromide(CTAB), was combined with Fenton’s reagent for sludge dewatering.Results show that the Fenton-CTAB conditioning significantly promotes the sludge dewatering.Using combined techniques of response surface methodology and uniform design, dosages of Fe2+, H2O2, and CTAB for water content response were optimized to be 89, 276, and 233 mg/g dry solids(DS),respectively.The water content of sludge decreased from 79.0% to 66.8% under the optimal conditions.Compared with cationic polyacrylamide, the Fenton-CTAB system exhibited superior sludge dewatering performance.To gain insights into the mechanisms involved in sludge dewatering, the effects of Fenton-CTAB conditioning on the composition of extracellular polymeric substances(EPS) and the morphology of the sludge flocs were investigated.The decomposition of EPS into some dissolved organics and the release of proteins in tightly bound EPS facilitated the conversion of bound water to free water and further reduced the water content of sludge cake.After conditioning, morphology of sludge showed aggregation.Overall, the enhanced sludge dewatering by Fenton-CTAB treatment provides an efficient way for management of sewage sludge.展开更多
考察了阳离子表面活性剂十六烷基三甲基溴化铵(CTMAB)浓度、添加量、调理时间和温度对活性污泥脱水和沉降性能的影响。结果表明,使用1 m L浓度1%的CTMAB调理污泥效果最佳,重力沉降的滤液体积最大。在最佳用量下,搅拌2 h,搅拌温度60℃时...考察了阳离子表面活性剂十六烷基三甲基溴化铵(CTMAB)浓度、添加量、调理时间和温度对活性污泥脱水和沉降性能的影响。结果表明,使用1 m L浓度1%的CTMAB调理污泥效果最佳,重力沉降的滤液体积最大。在最佳用量下,搅拌2 h,搅拌温度60℃时污泥的脱水性能最好,毛细吸水时间为8. 7 s,泥饼含水率下降了25%。通过SEM观察了原污泥和CTMAB调理后的污泥微观形态。展开更多
基金supported by the China Postdoctoral Science foundation (No.2018M642479)the National Natural Science Foundation of China (No.51821006)the Postdoctoral Science Foundation of Zhejiang Province (No.zj20180141).
文摘Enhancing sludge dewatering is of importance in reducing environmental burden and disposal costs.In this work, a cationic surfactant, cetyl trimethyl ammonium bromide(CTAB), was combined with Fenton’s reagent for sludge dewatering.Results show that the Fenton-CTAB conditioning significantly promotes the sludge dewatering.Using combined techniques of response surface methodology and uniform design, dosages of Fe2+, H2O2, and CTAB for water content response were optimized to be 89, 276, and 233 mg/g dry solids(DS),respectively.The water content of sludge decreased from 79.0% to 66.8% under the optimal conditions.Compared with cationic polyacrylamide, the Fenton-CTAB system exhibited superior sludge dewatering performance.To gain insights into the mechanisms involved in sludge dewatering, the effects of Fenton-CTAB conditioning on the composition of extracellular polymeric substances(EPS) and the morphology of the sludge flocs were investigated.The decomposition of EPS into some dissolved organics and the release of proteins in tightly bound EPS facilitated the conversion of bound water to free water and further reduced the water content of sludge cake.After conditioning, morphology of sludge showed aggregation.Overall, the enhanced sludge dewatering by Fenton-CTAB treatment provides an efficient way for management of sewage sludge.
