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生物铁修复Cr(VI)污染土壤的性能及机理
Application and mechanism of remediation Cr(VI) contaminated soil by bio- iron
投稿时间:2018-05-07  修订日期:2018-07-08
DOI:
中文关键词:  生物铁  活性污泥  土壤  Cr(VI)  还原
英文关键词:bio-iron  activated sludge  soil  Cr(VI)  reduction
基金项目:陕西省工业攻关计划项目
作者单位E-mail
程爱华 西安科技大学地质与环境学院 cah_cheng@126.com 
郑蕾 西安科技大学地质与环境学院  
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中文摘要:
      以活性污泥与生物铁作为修复剂,对比时间、pH、污泥投加量、Cr(VI)初始浓度对活性污泥、生物铁去除土壤中Cr(VI)的影响;考察生物铁对土壤中Cr(VI)的还原率;采用SEM、XRD、XPS对生物铁修复前后的Cr(VI)污染土壤进行表征分析。实验结果表明:在土壤中,生物铁对Cr(VI)的修复效果优于活性污泥,当pH为6.0,Cr(VI)初始浓度为300 mg?kg-1,生物铁和活性污泥的投加量均为19.57 mg?g-1,修复时间为45 d时,土壤中Cr(VI)经活性污泥与生物铁修复后浓度分别为31.42、19.69 mg?kg-1,去除率分别为89.52%、94.12%。生物铁修复土壤Cr(VI)以还原作用为主,吸附为辅。Cr(VI)污染土壤被生物铁修复后出现了FeOOH、Fe3O4以及Fe3O4与FeCr2O4的混合物,部分Cr(VI)被还原为Cr(III),铁被氧化为Fe2+、Fe3+。
英文摘要:
      In this study, activated sludge and bio-iron were cultivated in the same conditions as remediation reagents, and the effect of the influence factors such as time, pH, sludge dosage, and Cr(VI) initial concentration on the removal of Cr(VI) in soil were studied. Reduction ratio of Cr(VI) in soil by bio-iron were investigated. The contaminated soils before and after remediation were characterized by SEM, XRD and XPS. Experimental results showed that bio-iron had a better effect on Cr(VI) removal in soil than activated sludge. When the pH was 6.0, initial Cr(VI) concentration was 300 mg?kg-1, dosage of bio-iron and activated sludge was 19.57 mg?g-1, and remediation time was 45 d, the Cr(VI) concentrations in soils after the remediation of activated sludge and bio-iron decreased to 31.42 mg?kg-1 and 19.69 mg?kg-1, and the removal ratios were 89.52% and 94.12%, respectively. The remediation of Cr(VI) in soil by bio-iron could be attributed to the reduction effect. The FeOOH, Fe3O4, mixture of Fe3O4 and FeCr2O4 appeared in the Cr(VI) contaminated soil after the remediation by bio-iron. Parts of the Cr (VI) were reduced to Cr (III), and iron was oxidized to Fe2 + and Fe3 +.
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