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| Treatment of residual water from heavy metals contaminated sediment dredging by electro-coagulation-flotation based on real-time control strategy |
| XU Hai-yin1,2, YANG Zhao-hui1,2, ZENG Guang-ming1,2, LUO Yuan-ling3, HUANG Jing1,2, WANG Li-ke1,2, SONG Pei-pei1,2 |
1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;
2. Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, China;
3. Changsha Environmental Protection College, Changsha 410004, China |
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Abstract 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.
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Received: 20 August 2015
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