Purification,characterization and application of dual coagulants containing chitosan and different Al species in coagulation and ultrafiltration process

作     者：Wenyu Wang Shuang Zhao Qinyan Yue Baoyu Gao Wen Song Lijuan Feng 

作者机构：Shandong Provincial Key Laboratory of Water Pollution Control and Resource ReuseSchool of Environmental Science and EngineeringShandong UniversityJinan 250100China. Key Laboratory of Inorganic Chemistry in Uniuersities of ShandongDepartment of Chemistry and Chemical EngineeringJining UniversityShandong 273155China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2017年第29卷第1期

页      面：214-221页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China(No.21377071) the Tai Shan Scholar Foundation(No.ts201511003) 

主　　题：Al species Chitosan Dual coagulants Coagulation ultrafiltration Floc characteristics Membrane resistance 

摘      要：The objective of this study was to investigate the effect of different Al species and chitosan（CS） dosages on coagulation performance,floc characteristics（floc sizes,strength and regrowth ability and fractal dimension） and membrane resistance in a coagulation-ultrafiltration hybrid process.Results showed that different Al species combined with humic acid in diverse ways.A1_a had better removal efficiency,as determined by UV_（254） and dissolved organic carbon,which could be further improved by the addition of CS.In addition,the optimal dosage of different Al species was determined to be 4.0 mg/L with the CS concentration of 1.0 mg/L,by orthogonal coagulation experiments.Combining Al_a/A1_b/A1_c,with CS resulted in larger flocs,higher recovery,and higher fractal dimension values corresponding to denser flocs;in particular,the floc size at the steady state stage was four times larger than that obtained with Al species coagulants alone.The results of ultrafiltration experiments indicated that the external fouling percentage was significantly higher than that of internal fouling,at around 85%and 15%,respectively.In addition,the total membrane resistance was significantly decreased due to CS addition.