The disinfection by-products precursors removal efficiency and the subsequent effects on chlorine decay for humic acid synthetic water treated by coagulation process and coagulation-ultrafiltration process

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• 作者：Yan Wang ; ^{wangyan824@sdu.edu.cn} ; Qian Wang ; Bao-Yu Gao ; Qinyan Yue ; Yanxia Zhao
• 关键词：Disinfection by-products ; Humic acid ; Coagulation&ndash ; ultrafiltration process ; Chlorine decay ; Flocs
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：15 June, 2012
• 卷：193-194
• 期：Complete
• 页码：59-67
• 文件大小：324 K

摘要

The disinfection by-products (DBPs) precursors removal efficiency and the subsequent effects on chlorine decay of coagulation-ultrafiltration process were studied in a laboratory in comparison with coagulation process. And the relation between flocs properties and the performance of coagulation-ultrafiltration process was investigated by the experiments of flocs size, fractal dimension and the surface charge. The removal efficiency of coagulation-ultrafiltration process showed that turbidity and UV₂₅₄ could be removed efficiently regardless of polyferric chloride (PFC) dosage and solution pH. Even when dosage was 3 mg L^鈭?, the turbidity and UV₂₅₄ removal efficiencies were higher than 90%in coagulation-ultrafiltration process. The chlorine decay showed that under various technological conditions, the difference between chlorine decay curves obtained by coagulation-ultrafiltration process was less than that obtained by coagulation process. According to the analysis by AQUASIM software, the concentration of fast reducing agents (FRA) in coagulation-ultrafiltration process is lower than that in coagulation process, but the concentration of Slow Reducing Agents (SRA) in coagulation-ultrafiltration process was higher than in coagulation process except dosage = 18 mg L^鈭?. Comparing the flocs properties to the performance of coagulation-ultrafiltration process, it can be found that when flocs size was small (<200 渭m), the HA removal efficiency increased with flocs size increasing, while when flocs size was large (>200 渭m), the HA removal efficiency was influenced mainly by flocs structure. The more compact the flocs, the higher the HA removal efficiency.