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| The removal effect of Cd, Zn, and Cu using a micro-electric field constructed wetland system |
| Received:October 18, 2017 |
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| KeyWord:micro-electric field;constructed wetland;hydraulic retention time;voltage |
| Author Name | Affiliation | E-mail | | ZHANG Xian | College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China | | | WANG Yu-hui | College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China | yhwang@dhu.edu.cn | | ZHAO Xiao-xiang | College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China | | | SHA Yi | College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China | |
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| Abstract: |
| To explore a heavy metal wastewater treatment process with high effectiveness, the ecological, and environmental complementary advantages of electrochemical techniques and constructed wetland were coupled in this study to build a new treatment system called a "micro-electric field constructed wetland." Through a simulation test on two different plants species, Scirpus tabernaemontani and Juncus roemerianus, we planted a micro-electric field constructed wetland and removed heavy metals from aqueous solution with different hydraulic retention times(HRT) and voltages to find the best conditions for micro-electric field constructed wetland wastewater treatment. The results demonstrated that the treatment efficiency of S. tabernaemontani planted in constructed wetland was more than 20% higher than that of J. roemerianus planted in constructed wetland. When the HRT was 5 d and the voltage was about 2 V, the removal efficiencies of Cd, Zn and Cu were 74.0%, 75.8%, and 95.6%, respectively, and the removal efficiency is the best. Besides, the enrichment ability of three kinds of heavy metals was different. The root biomass enrichment coefficient of S. tabernaemontani was in the order of Cu(288.24) > Zn(143.78) > Cd(127.75), but that of J. roemerianus was in the order of Cu(299.84) > Cd(166.34) > Zn(159.61). Statistical analysis shows that both the voltage and HRT have an impact on the removal of heavy metals in a micro-electric field constructed wetland, but the influence of voltage is more significant. |
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