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| Fe/C微电解协同臭氧氧化组合工艺处理Cu(Ⅱ)-EDTA络合废水 |
| Application of Fe/C micro-electrolysis combined with ozonation process on treating Cu(Ⅱ)-EDTA wastewater |
| 投稿时间:2019-03-27 |
| DOI:10.13259/j.cnki.eri.2019.02.003 |
| 中文关键词: 电镀废水 金属络合物 Fe/C微电解 臭氧氧化 |
| 英文关键词:electroplating wastewater metal complex Fe/C micro-electrolysis ozonation |
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| 中文摘要: |
| 采用Fe/C微电解协同臭氧氧化组合工艺对乙二胺四乙酸络合铜[Cu(Ⅱ)-EDTA]废水进行处理。分别考察了先臭氧氧化后微电解 (O3-Fe/C)、先微电解后臭氧氧化 (Fe/C-O3)以及微电解与臭氧氧化同时进行 (Fe/C+O3) 等三种组合方式对Cu(Ⅱ)-EDTA溶液中铜离子及总有机碳(TOC)去除效果的影响,同时对工艺条件进行参数优化,并对反应机理进行初步探讨。结果表明,先微电解后臭氧氧化的处理效果明显优于其他两种组合方式;最佳工艺条件为Fe/C微电解处理10 min后通入O3进行氧化反应20 min,其中Fe、C质量比为1∶1、铁屑投加量为3 g·L-1、溶液初始pH为3。在该条件下,当Cu(Ⅱ)初始质量浓度为5 mg·L-1、EDTA与Cu(Ⅱ)的摩尔比为1∶1时,Cu(Ⅱ)和TOC的去除率分别可达97.5%和71.9%。Fe/C微电解的氧化还原作用使部分Cu(Ⅱ)-EDTA破络并将Cu(Ⅱ)还原去除,同步释放出的Fe2+在臭氧氧化时发挥催化作用,促使产生更多·OH,从而加速Cu(Ⅱ)-EDTA的氧化破络。 |
| 英文摘要: |
| In this paper, the process of Fe/C micro-electrolysis synergized ozonation was used to treat Cu(Ⅱ)-EDTA wastewater. Different combination processes were investigated on the removal performance of copper ions and TOC in Cu(Ⅱ)-EDTA solution, i.e. ozonation before Fe/C micro-electrolysis process (O3-Fe/C), Fe/C micro-electrolysis followed by ozonation process (Fe/C-O3), and the simultaneous Fe/C micro-electrolysis and ozonation process (Fe/C+O3). The operating parameters were optimized for the combination process, and related reaction mechanisms were also discussed preliminarily. Results showed that the treatment efficiency of Fe/C-O3 process was superior to other two processes, i.e. Fe/C micro-electrolysis of 10 min followed by ozonation of 20 min, which optimized reaction conditions were mass ratio of Fe and C=1:1, iron filings dosage=3 g·L-1 and pH=3. Under this condition, when the initial concentration of Cu(Ⅱ)=5 mg·L-1 and nEDTA:nCu(Ⅱ)=1:1, the removal rates of Cu(Ⅱ) and TOC were 97.5% and 71.9%, respectively. The oxidation-reduction action of Fe/C micro-electrolysis leads to partial decomplexation of Cu(Ⅱ)-EDTA and the reduction of Cu(Ⅱ) to Cu, meanwhile the simultaneously released Fe2+ plays a catalytic role in the ozonation stage, which promotes the generation of more ·OH, thus accelerating the decomplexation of Cu(Ⅱ)-EDTA. |
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