Evaluation of enhanced soil washing process with tea saponin in a peanut oil-water solvent system for the extraction of PBDEs/PCBs/PAHs and heavy metals from an electronic waste site followed by vetiver grass phytoremediation
Evaluation of enhanced soil washing process with tea saponin in a peanut oil-water solvent system for the extraction of PBDEs/PCBs/PAHs and heavy metals from an electronic waste site followed by vetiver grass phytoremediation
复制标题
在花生油-水溶剂系统中使用茶皂素强化土壤冲洗过程的评估，用于从电子废物场提取 PBDEs/PCBs/PAHs 和重金属，然后进行香根草植物修复
DOI：
10.1002/jctb.4512
复制
发表时间：
2015
影响因子：
3.4
通讯作者：
Orori Kengara Fredrick
中科院分区：
文献类型：
--
作者：
Ye Mao;Sun Mingming;Wan Jinzhong;Fang Guodong;Li Huixin;Hu Feng;Jiang Xin;Orori Kengara Fredrick
PBDEs/PCBs/PAHs和重金属混合污染场地的问题受到广泛关注。为了解决相关的环境问题，迫切需要创新的修复技术。在连续两次洗涤循环后，发现5.0 mL L− 1花生油和5.0 g L− 1茶皂素分别有效提取94.6%、97.1%、95.1%、83.5%和87.1%的PBDEs、PCBs、PAHs、Pb和Ni。种植香根草和添加营养物质4个月后，PBDEs、PCBs和PAHs的降解率分别为45.1%、36.2%和40.2%。植物提取对Pb和Ni的去除率分别为4.1%和2.0%。联合处理部分恢复了水洗土壤的微生物学功能，土壤微生物数量、生物量C、N和功能多样性均显着增加（P< 0.05）。处理后，残留的有机污染物和重金属主要存在于非常缓慢的解吸馏分和残留馏分，如Tenax提取结合第一个三室模型和连续提取评估。修复土壤中残留的混合污染物的二次环境风险是有限的。结论所提出的联合清除策略被证明是有效的和环境友好的。© 2014化学工业协会
BACKGROUNDProblems associated with PBDEs/PCBs/PAHs and heavy metals mixed contaminated sites have received wide attention. To address the associated environmental concerns, innovative remediation techniques are urgently needed.RESULTS5.0 mL L−1peanut oil and 5.0 g L−1tea saponin were found to be effective in extracting 94.6%, 97.1%, 95.1%, 83.5%, and 87.1% of PBDEs, PCBs, PAHs, Pb, and Ni, respectively, after two successive washing cycles. Cultivation of vetiver grass and addition of nutrients for 4 months further degraded 45.1%, 36.2%, and 40.2% of the residual PBDEs, PCBs and PAHs, respectively. Pb and Ni removal efficiencies by phytoextraction were 4.1% and 2.0%, respectively. The combined treatment partially restored the microbiological functions of washed soil, as indicated by a significant increase in the number, biomass C, N, and functioning diversity of soil microorganisms (P< 0.05). After treatment, the residual organic pollutants and heavy metals mainly existed as very slowly desorbing fractions and residual fractions, as evaluated by Tenax extraction combined with a first‐three‐compartment model and sequential extraction. The secondary environmental risk of residual mixed pollutants in the remediated soil was limited.CONCLUSIONThe proposed combined cleanup strategy proved to be effective and environmentally friendly. © 2014 Society of Chemical Industry