铁粉还原-Fenton氧化处理络合铜废水的研究
Study on treatment of wastewater containing complex copper by iron powder assisted Fenton
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摘要: 采用铁粉还原-Fenton氧化工艺处理含络合铜工业废水，研究了联合工艺对络合铜的破络效果，重点考察了常温下H2O2投加量、初始pH值、反应时间、Cu(Ⅱ)初始浓度以及铁粉粒径等因素对该工艺处理效果的影响，同时探讨了相关机理。结果表明：在初始Cu(Ⅱ)浓度为50 mg/L，初始pH=3的体系中，加入过量铁粉，H2O2投加量控制在H2O2∶COD=1.5∶1(质量比)，反应30 min后在pH＝9的条件下沉淀，废水的COD 去除率为86.5%，Cu(Ⅱ)去除率为99.9%，处理水达到《电镀污染物排放标准》(GB21900-2008)要求。研究还表明：铁粉粒径对处理效率的影响较小，采用工业级铁粉即可达到理想效果。Abstract: Iron powder reduction assisted Fenton oxidization technic was used to treat industrial wastewater containing complex copper. The breaking complexing effect of complex copper in this combined process was investigated, the influence of H2O2 dosage,initial pH,reaction time,initial Cu(Ⅱ) concentration of wastewater, different diameter of iron powder on copper removal efficiency at normal temperatures were discussed, and the possible mechanism was also involved. The result showed that under the 50 mg/L Cu(Ⅱ) concentration when the conditions were controlled as follow: initial pH=3, iron powder was overused, H2O2 dosage was at H2O2∶COD=1.5∶1(mass ratio), reaction time was 30 minutes ,and precipitation pH=9, COD and copper removal rates were 86.5% and 99.9%,respectively, which could meet the new discharge standard of GB21900-2800. And further studies showed that the iron sizes had little effect on treatment efficiency, so using the industrial iron powder could have a good performance.
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Key words:
- complex copper /
- ethylenediamine tetraacetic acid /
- Fenton oxidization
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