Effects of epichlorohydrin-dimethylamine on polytitanium chloride coagulation and membrane fouling in humic-kaolin water treatment: Dosage, dose method and solution pH

被引：25
作者：
Huang, Xin [1 ]
Gao, Baoyu [1 ]
Sun, Yangyang [1 ]
Yue, Qinyan [1 ]
Wang, Yan [1 ]
Li, Qian [1 ]
Xu, Xing [1 ]
机构：
[1] Shandong Univ, Sch Environm Sci & Engn, 27 Shanda South Rd, Jinan 250100, Shandong, Peoples R China
来源：
SEPARATION AND PURIFICATION TECHNOLOGY | 2017年 / 173卷
关键词：
Titanium salts; Epichlorohydrin-dimethylamine; Dual-coagulant; Floc property; Membrane fouling; TITANIUM TETRACHLORIDE TICL4; ORGANIC-MATTER REMOVAL; WASTE-WATER; FLOC CHARACTERISTICS; FERRIC-CHLORIDE; HYBRID PROCESS; LOW-TURBIDITY; IRON SALTS; PERFORMANCE; FLOCCULATION;
D O I：
10.1016/j.seppur.2016.09.035
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
This study first investigated the effects of epichlorohydrin-dimethylamine (DAM-ECH) on coagulation performance and floc properties of polytitanium chloride (PTC) in humic acid-kaolin water treatment. The factors including DAM-ECH dosage, dosing sequence of PTC and DAM-ECH and initial solution pH were considered. Results showed that the addition of DAM-ECH could enhance turbidity removal and dissolved organic matter (DOM) removal efficiency of PTC. The larger amount of DAM-ECH did not equal to better performance. The chosen dosage of DAM-ECH was 1.0 mg/L for the consideration of cost and coagulation performance. In addition, dosing sequence and solution pH of PTC and DAM-ECH also significantly affected coagulation behaviour and floc properties. Results indicated that residual turbidity was significantly reduced when pH < 6. Moreover, PTC-1.0DAM-ECH (DAM-ECH was added after PTC) achieved better DOM removal when pH < 6, while 1.0DAM-ECH-PTC (FTC was added after DAM-ECH) achieved better DOM removal efficiency when pH > 6. 1.0DAM-ECH-PTC flocs grew faster and attained a larger size compared with PTC-1.0DAM-ECH. Flocs formed by PTC-1.0DAM-ECH and 1.0DAM-ECH-PTC both were stronger than those formed by PTC when pH < 6. When pH was above 6, floc strength was only enhanced by PTC-1.0DAM-ECH. Meanwhile, floc recovery ability was only improved by PTC-1.0DAM-ECH. In addition, flocs formed by PTC-1.0DAM-ECH were more compact than those formed by PTC, while flocs formed by 1.0DAM-ECH-PTC were looser. Membrane fouling degree was also reduced by the addition of DAM-ECH, especially when DAM-ECH was added before PTC. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：209 / 217
页数：9
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