Deep removal of complex nickel by using magnetic flocculation coupled with highly-efficient heavy metal chelating agent EDTC
QIU Yi-qin1, SUN Shui-yu1,2,3, XIAO Xiao1, YE Zi-wei1, GUO Yan-ping2
1. School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China; 2. Guangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, China; 3. Provincial Education Department Key Laboratory of Resources Comprehensive Utilization and Cleaner Production, Guangdong University of Technology, Guangzhou 510006, China
Abstract：The deep removal of complex nickel from wastewater by using magnetic flocculation coupled with an independent synthetic highly-efficient heavy metal chelating agent EDTC was investigated. CA-Ni (citric acid, CA), TA-Ni (tartaric acid, TA) and SP-Ni (pyrophosphate, SP) were dissolved in deionized water as the simulated wastewater. Important investigated parameters included EDTC dosage, magnetic seeding dosage, initial pH and sedimentation time. The magnetic flocculation mechanism involved in the reaction was also explored. Residual Ni concentration could be less than 0.1mg/L from the initial concentration of 50mg/L, under the conditions of 100mg/L magnetic seeds (350r/min, 2min), MEDTC/MNi=10 (250r/min, 2min), PAM 1mg/L (50r/min,3min) and 5min sedimentation time with unregulated pH. The results of Zeta potential illustrated the magnetic seeds were firmly combined with flocs when pH=6.5~7.5, and it was the same with magnetic seeds and EDTC when pH<7.Majority of magnetic flocswas integrated with the magnetic seeds, which served as a nucleus to enhance the flocculation property and reduce 20% of EDTC dosages. The particle size analysis and fractal dimension presented that it would decrease the micro flocs, increase the floc volume and density by loading the magnetic seeds.
邱伊琴, 孙水裕, 肖晓, 叶子玮, 郭艳平. 磁絮凝耦合重金属捕集剂EDTC对酸性络合镍的深度脱除[J]. 中国环境科学, 2017, 37(2): 560-569.
QIU Yi-qin, SUN Shui-yu, XIAO Xiao, YE Zi-wei, GUO Yan-ping. Deep removal of complex nickel by using magnetic flocculation coupled with highly-efficient heavy metal chelating agent EDTC. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(2): 560-569.
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