Use of packed scrap iron anodes for continuous electrochemical Cr(VI) reduction process in electroplating wastewater treatment

被引:18
|
作者
Ho, Chao-Chuan [1 ]
Yu, Jui-Shuan [2 ]
Yang, Shao-Wei [3 ]
Ya, Vinh [3 ,4 ]
Le, Hoang Anh [5 ,6 ]
Cheng, Liao-Ping [1 ]
Choo, Kwang-Ho [7 ]
Li, Chi-Wang [3 ]
机构
[1] Tamkang Univ, Dept Chem & Mat Engn, New Taipei 25137, Taiwan
[2] Taipei Univ Marine Technol, Dept Travel Management, 150,Sec 3,BinHai Rd, New Taipei 25172, Taiwan
[3] Tamkang Univ, Dept Water Resources & Environm Engn, 151 Yingzhuan Rd, New Taipei 25137, Taiwan
[4] Dalat Univ, Fac Chem & Environm, Da Lat, Vietnam
[5] Univ Sci, Fac Environm, Ho Chi Minh City, Vietnam
[6] Vietnam Natl Univ, Ho Chi Minh City, Vietnam
[7] Kyungpook Natl Univ, Dept Environm Engn, 80 Daehak Ro, Daegu 702701, South Korea
关键词
Continuous electrochemical reduction; Cr(VI) reduction; Electroplating wastewater; Scrap iron packed column; Oxidation-reduction potential; HEXAVALENT CHROMIUM REDUCTION; REMOVAL; PH; CR(III);
D O I
10.1016/j.jwpe.2021.102191
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The performance of an electrochemical reduction process was investigated for the treatment Cr(VI)-containing electroplating wastewater using a continuous-flow scrap iron packed column as an sacrificial anode. The effects of the key operating parameters including hydraulic retention time (HRT), current supply ratio (CSR), and inlet Cr(VI) concentration were systematically studied. With a fixed CSR of 106%, the HRT has no impact on Cr (VI) removal, but energy consumption increased with decreasing HRT. A complete Cr(VI) removal was obtained with a final ORP of approximately -100 mV. Increasing the inlet Cr(VI) concentration caused an inefficient removal efficiency of Cr(VI) with an increases in ORP. In contrast, Cr(VI) removal remained virtually unchanged, but ORP was dramatically decreased, when the influent Cr(VI) concentration decreased. Continuous and complete Cr(VI) reduction via electrochemical reactions can be achieved by the ORP range of -200 to -100 mV. The operating cost using continuous flow treatments with HRT of 60 min required less than batch reactor treatment around 40-57%.
引用
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页数:6
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