Effect of oxoanions on oxidant decay, bromate and brominated disinfection by-product formation during chlorination in the presence of copper corrosion products

被引:27
作者
Fang, Chao [1 ,2 ,3 ]
Ding, Shunke [1 ,2 ,3 ]
Gai, Shibo [1 ,2 ,3 ]
Xiao, Rong [1 ,2 ,3 ]
Wu, Yinan [1 ]
Geng, Bing [4 ]
Chu, Wenhai [1 ,2 ,3 ]
机构
[1] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China
[2] Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China
[3] Tongji Univ, Int Joint Res Ctr Sustainable Urban Water Syst, Shanghai 200092, Peoples R China
[4] Shanghai Natl Engn Res Ctr Urban Water Resources, Shanghai 200082, Peoples R China
基金
中国国家自然科学基金;
关键词
Oxidant decay; Br-DBPs; Bromate; Copper corrosion products; Complexation; Oxoanions; BROMIDE-CONTAINING WATERS; ORGANIC-COMPOUNDS; DRINKING-WATER; COMPETITIVE ADSORPTION; SODIUM-HYPOCHLORITE; PHOSPHATE; CATALYSIS; IMPACT; HALOACETAMIDES; DECOMPOSITION;
D O I
10.1016/j.watres.2019.115087
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The present study investigated the effect of oxoanions on catalytic behaviour of copper corrosion products (CCPs) during chlorination of bromide-containing waters. Three types of oxoanions (carbonate, sulphate, and phosphate) and four types of CCPs (Cu2+, Cu(OH)(2), Cu2O, and CuO) were involved in investigation and the effect of oxoanions concentration was also examined. The result indicated that carbonate and sulphate slightly inhibited oxidant decay in the presence of CCPs, but the formation of brominated disinfection by-products (Br-DBPs) remained largely unchanged. In contrast, the presence of phosphate (0.2-1 mM) almost eliminated the catalytic effect of Cu2+. For CCP solids (i.e. Cu(OH)2, Cu2O, and CuO), phosphate preferentially inhibited the formation of bromate rather than Br-DBPs. Despite the catalysis by CCP solids was reduced to some extent, the oxidant decay rate and bromate and Br-DBP formation were still significantly higher than blank groups, even at high phosphate concentration. By testing different addition scheme (simultaneous/sequential addition), it was proposed that phosphate was a strong competitor for hypohalites, rapidly destroying CCPs-hypohalites complexes on some adsorption sites. However, there were some specific sites that can only be adsorbed by hypohalites, leading to the incomplete inhibition of phosphate. Finally, the inhibition effect of phosphate on CCPs catalysis was tested in real water matrix. For Cu2+, higher reduction of bromate and Br-DBPs was found in raw water rather than filtered water, while converse pattern was true for Cu(OH)(2) and Cu2O, and this discrepancy can be ascribed to the difference in catalytic mechanism between Cu2+ and CCP solids. (C) 2019 Elsevier Ltd. All rights reserved.
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页数:9
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