A critical evaluation of magnetic activated carbon's potential for the remediation of sediment impacted by polycyclic aromatic hydrocarbons
A critical evaluation of magnetic activated carbon's potential for the remediation of sediment impacted by polycyclic aromatic hydrocarbons
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DOI：
10.1016/j.jhazmat.2014.12.030
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发表时间：
2015-04-09
影响因子：
13.6
通讯作者：
Werner, David
中科院分区：
文献类型：
--
作者：
Han, Zhantao;Sani, Badruddeen;Werner, David
在沉积物中添加活性炭（AC）或生物炭（BC）来降低有机污染物的化学和生物有效性是一种很有前途的原位修复技术。但是，对将被吸附的污染物留在原位的担忧激发了对吸附剂回收方法的研究。本研究探讨磁性吸附剂的使用。煤基磁性活性炭（MAC）是四种AC和BC衍生的磁性吸附剂中修复多环芳烃（PAHs）最强的。在三个月内，8.1%的MAC （w/w，等于5% AC含量）与5% （w/w）的原始AC在减少水中多环芳烃方面同样有效，减少率为98%。3个月后沉积物中MAC的回收率为77%，不完全MAC的恢复既有积极的影响，也有消极的影响。在MAC恢复后，水中多环芳烃浓度略有反弹，但6个月后，水中多环芳烃浓度再次下降，这可能是由于23%未恢复的MAC的存在。另一方面，8.1% MAC剂量的77%恢复不足以减少细粒AC或MAC修正对AC敏感物种斑纹蚓的排泄率、生长和繁殖的生态毒性作用。(C) 2014 Elsevier B.V.版权所有
Addition of activated carbon (AC) or biochar (BC) to sediment to reduce the chemical and biological availability of organic contaminants is a promising in-situ remediation technology. But concerns about leaving the adsorbed pollutants in place motivate research into sorbent recovery methods. This study explores the use of magnetic sorbents. A coal-based magnetic activated carbon (MAC) was identified as the strongest of four AC and BC derived magnetic sorbents for polycyclic aromatic hydrocarbons (PAHs) remediation. An 8.1% MAC amendment (w/w, equal to 5% AC content) was found to be as effective as 5% (w/w) pristine AC in reducing aqueous PAHs within three months by 98%. MAC recovery from sediment after three months was 77%, and incomplete MAC recovery had both, positive and negative effects. A slight rebound of aqueous PAH concentrations was observed following the MAC recovery, but aqueous PAH concentrations then dropped again after six months, likely due to the presence of the 23% unrecovered MAC. On the other hand, the 77% recovery of the 8.1% MAC dose was insufficient to reduce ecotoxic effects of fine grained AC or MAC amendment on the egestion rate, growth and reproduction of the AC sensitive species Lumbriculus variegatus. (C) 2014 Elsevier B.V. All rights reserved.