Residual water from heavy metals contaminated sediment dredging had high concentrations of heavy metals, fluctuant water-quality and poor sedimentation. Electro-coagulation-flotation with aluminium anode (Al-ECF) was applied to treat residual water. First, pH and turbidity were selected as monitoring factors of real-time control. Then, a real-time control response model of ratio current and residual cadmium (Cd) was established by the tools of precipitation simulation and data fitting. Experiment results showed that Al-ECF could neutralize pH and improve separation performance and lead (Pb), Cd and zinc (Zn) of effluent met the discharge standards. Additionally, the real-time control strategy could save 35.8% of anode material and 43.4% of electricity power and reduce 47.9% of sludge production.
徐海音, 杨朝晖, 曾光明, 罗远玲, 黄兢, 汪理科, 宋佩佩. 基于实时控制的电絮凝-气浮处理重金属清淤尾水[J]. 中国环境科学, 2016, 36(3): 786-792.
XU Hai-yin, YANG Zhao-hui, ZENG Guang-ming, LUO Yuan-ling, HUANG Jing, WANG Li-ke, SONG Pei-pei. Treatment of residual water from heavy metals contaminated sediment dredging by electro-coagulation-flotation based on real-time control strategy. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(3): 786-792.
Yenilmez F, Aksoy A. Comparison of phosphorus reduction alternatives in control of nutrient concentrations in Lake Uluabat: Partial versus full sediment dredging[J]. Limnologica-Ecology and Management of Inland Waters, 2013,43(1):1-9.
[6]
Chiang Y W, Ghyselbrecht K, Santos R M, et al. Adsorption of multi-heavy metals onto water treatment residuals: Sorption capacities and applications[J]. Chem Eng J, 2012,200-202:405-415.
[7]
Xu H Y, Yang Z H, Zeng G M, et al. Investigation of pH evolution with Cr (VI) removal in electrocoagulation process: Proposing a real-time control strategy[J]. Chem. Eng. J., 2014,239:132-140.
Yang Z H, Xu H Y, Zeng G M, et al. The behavior of dissolution/passivation and the transformation of passive films during electrocoagulation: Influences of initial pH, Cr (VI) concentration, and alternating pulsed current[J]. Electrochim Acta, 2015,153:149-158.
[11]
Gustafsson J. Visual MINTEQ version 3.0[M]. KTH Royal Inst of Technol, Stockholm, Sweden, 2010.
[12]
Heidmann I, Calmano W. Removal of Ni, Cu and Cr from a galvanic wastewater in an electrocoagulation system with Fe-and Al-electrodes[J]. Sep. Purif. Technol., 2010,71(3):308-314.
[13]
Song P P, Yang Z H, Xu H Y, et al. Investigation of Influencing Factors and Mechanism of Antimony and Arsenic Removal by Electrocoagulation Using Fe-Al Electrodes[J]. Ind. Eng. Chem. Res., 2014,53(33):12911-12919.
[14]
Xu H Y, Yang Z H, Luo Y L, et al. A novel approach to sustain Fe0-electrocoagulation for Cr (VI) removal by optimizing chloride ions[J]. Sep. Purif. Technol., 2015,156:200-206.
[15]
HJ 2007-2010 污水气浮处理工程技术规范[S].
[16]
Gao P, Chen X M, Shen F, et al. Removal of chromium (VI) from wastewater by combined electrocoagulation-electroflotation without a filter[J]. Sep. Purif. Technol., 2005,43(2):117-123.
Huang J, Yang Z H, Zeng G M, et al. Influence of composite flocculant of PAC and MBFGA1on residual aluminum species distribution[J]. Chem. Eng. J., 2012,191:269-277.
