| 铝铁电极联用电絮凝法处理Cu-EDTA络合废水 |
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| 引用本文： | 谭竹,杨朝晖,徐海音,黄兢,李璇,宋佩佩,杨坚.铝铁电极联用电絮凝法处理Cu-EDTA络合废水[J].环境工程学报,2014,8(8):3167-3173. |
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| 作者姓名： | 谭竹 杨朝晖 徐海音 黄兢 李璇 宋佩佩 杨坚 |
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| 作者单位： | 1. 湖南大学环境科学与工程学院, 长沙 410082;2. 环境生物与控制教育部重点实验室(湖南大学), 长沙 410082;1. 湖南大学环境科学与工程学院, 长沙 410082;2. 环境生物与控制教育部重点实验室(湖南大学), 长沙 410082;1. 湖南大学环境科学与工程学院, 长沙 410082;2. 环境生物与控制教育部重点实验室(湖南大学), 长沙 410082;1. 湖南大学环境科学与工程学院, 长沙 410082;2. 环境生物与控制教育部重点实验室(湖南大学), 长沙 410082;1. 湖南大学环境科学与工程学院, 长沙 410082;2. 环境生物与控制教育部重点实验室(湖南大学), 长沙 410082;1. 湖南大学环境科学与工程学院, 长沙 410082;2. 环境生物与控制教育部重点实验室(湖南大学), 长沙 410082;3. 长沙市人防工程质量监督定额管理站, 长沙 410000 |
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| 基金项目： | 国家自然科学基金资助项目（30970105，50478053）；国家“水体污染控制与治理”科技重大专项（2009ZX07212-001-02） |
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| 摘 要： | 采用电絮凝法处理Cu-EDTA模拟废水,研究电极组合方式、初始pH值和氯化钠浓度3个因素对化学需氧量(COD)和Cu去除效果的影响。实验研究发现,当电极组合方式为2个铝阳极和2个铁阴极,起始pH值为3,氯化钠浓度为0.5 g/L,换极周期为40 min,反应时间为80 min时,COD去除率达到78.7%,Cu离子去除率达到99.9%。通过实验研究确定EDTA的去除机制主要是:酸性条件下的次氯酸氧化作用,碱性条件下的氢氧化物絮凝沉淀作用及单核态铝/铁与多核态铝/铁电荷中和作用,Cu的去除机制主要是氢氧化物的絮凝沉淀作用和铁电极的电沉积作用。
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| 关 键 词： | 电絮凝 EDTA Cu 电极组合 去除机制 |
Removal of Cu-EDTA from aqueous solution by electrocoagulation using Al and Fe electrodes |
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| Tan Zhu,Yang Zhaohui,Xu Haiyin,Huang Jing,Li Xuan,Song Peipei and Yang Jian.Removal of Cu-EDTA from aqueous solution by electrocoagulation using Al and Fe electrodes[J].Techniques and Equipment for Environmental Pollution Control,2014,8(8):3167-3173. |
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| Authors: | Tan Zhu Yang Zhaohui Xu Haiyin Huang Jing Li Xuan Song Peipei and Yang Jian |
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| Institution: | 1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China;1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China;1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China;1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China;1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China;1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China;3. The Quality Supervision and Management Station of Civil Air Defense Engineering, Changsha 410000, China |
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| Abstract: | In this paper, the electrocoagulation method was investigated for the removal of Cu-EDTA from simulated wastewater. Several operating parameters, namely electrode arrangement, initial pH and NaCl concentration, were studied systematically. It was found that 78.7% rejection of COD and 99.9% rejection of Cu were obtained under the condition of 2 anodes of Al and 2 cathodes of Fe, initial pH 3 and NaCl 0.75 g/L. The polarities of electrodes were switched every 40 min. The reaction time was 80 min. The study suggested that the major EDTA removal mechanism was oxidation by hypochlorite in acidic condition; while under alkaline condition, co-precipitation with Al/Fe oxyhydroxides and charge neutralization by monomeric and polymeric Al species were the main mechanisms. Co-precipitation with Al/Fe oxyhydroxides and electrodeposition by Fe electrodes were the major removal mechanisms of Cu. |
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| Keywords: | electrocoagulation EDTA Cu electrode arrangement removal mechanism |
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