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Zerovalent iron in conjunction with surfactants to remediate sediments contaminated by polychlorinated biphenyls and nickel
Chemosphere ( IF 8.8 ) Pub Date : 2017-09-13 , DOI: 10.1016/j.chemosphere.2017.09.038
Yingxin Wu , Yu Wang , Xiongfei Huang , Siyuan Chen , Xi Zhong , Zhuobiao Ni , Xinde Cai , Xiaowen Liu , Marie-Odile Simonnot , Rongliang Qiu

Dredging and disposal is commonly used for cleanup of contaminated sediments, leaving the relocated sediments still in need of remediation. In this study, the feasibility of two approaches to using zerovalent iron (ZVI) in conjunction with surfactants to remediate sediments contaminated by polychlorinated biphenyls (PCBs) and Ni was investigated. Approach A is surfactant desorption followed by ZVI treatment and approach B is a simple mixture of ZVI and sediment in surfactant solution. Results of approach A show that 65.24% of PCBs and 2.12% of Ni were desorbed by 1% Envirosurf; however, the sequential ZVI-mediated reductive dechlorination (ZVI-RD) was ineffective due to micelle sequestration by high contents of surfactants while Ni could be almost completely removed. For approach B, less than 1% of coexisting Ni was released to aqueous solution, and 47.18%–76.31% PCBs could be dechlorinated by ZVI with the addition of 0.04% surfactants (Tween-80 and Envirosurf). Results of dechlorination kinetics and ZVI morphologies reveal that surfactants at the concentrations as low as 0.04% were able to enhance the contact of sediment-bound PCBs with ZVI, and also to alleviate ZVI passivation. The PCB mixtures in sediment were continuously desorbed and dechlorinated, yielding lower substituted homologues that are less toxic and less hydrophobic. Thus, a simple mixture of ZVI and contaminated sediments without dewatering appears to be a promising alternative to the remediation of PCBs-contaminated sediments.

中文翻译:

零价铁与表面活性剂的结合,可修复被多氯联苯和镍污染的沉积物

疏ed和处置通常用于清理受污染的沉积物,因此搬迁后的沉积物仍需要补救。在这项研究中,研究了使用零价铁(ZVI)和表面活性剂来补救被多氯联苯(PCB)和Ni污染的沉积物的两种方法的可行性。方法A是表面活性剂解吸,然后进行ZVI处理,方法B是ZVI和表面活性剂溶液中沉积物的简单混合物。方法A的结果表明,1%的Envirosurf解吸了65.24%的PCB和2.12%的Ni;然而,由于高含量表面活性剂的胶束螯合,而ZVI介导的还原性脱氯(ZVI-RD)无效,而Ni几乎可以被完全去除。对于方法B,少于1%的共存Ni被释放到水溶液中,ZVI可以通过添加0.04%表面活性剂(Tween-80和Envirosurf)对47.18%–76.31%的PCB进行脱氯。脱氯动力学和ZVI形态的结果表明,浓度低至0.04%的表面活性剂能够增强沉积物结合的PCB与ZVI的接触,并减轻ZVI的钝化。沉积物中的多氯联苯混合物不断地脱附和脱氯,产生了较低的取代同系物,其毒性较小,疏水性较小。因此,ZVI和受污染的沉积物的简单混合而不脱水,似乎是补救多氯联苯污染的沉积物的有前途的替代方法。脱氯动力学和ZVI形态的结果表明,浓度低至0.04%的表面活性剂能够增强沉积物结合的PCB与ZVI的接触,并减轻ZVI的钝化。沉积物中的多氯联苯混合物不断地脱附和脱氯,产生了较低的取代同系物,其毒性较小,疏水性较小。因此,ZVI和受污染的沉积物的简单混合而不脱水,似乎是补救多氯联苯污染的沉积物的有前途的替代方法。脱氯动力学和ZVI形态的结果表明,浓度低至0.04%的表面活性剂能够增强沉积物结合的PCB与ZVI的接触,并减轻ZVI的钝化。沉积物中的多氯联苯混合物不断地脱附和脱氯,产生了较低的取代同系物,其毒性较小,疏水性较小。因此,ZVI和受污染的沉积物的简单混合而不脱水,似乎是补救多氯联苯污染的沉积物的有前途的替代方法。
更新日期:2017-09-14
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