A critical evaluation of magnetic activated carbon's potential for the remediation of sediment impacted by polycyclic aromatic hydrocarbons

JOURNAL OF HAZARDOUS MATERIALS

卷:286

Article

Han, Zhantao^1,2,3  Sani, Badruddeen¹  Akkanen, Jarkko⁴  Abel, Sebastian⁴  Nybom, Inna⁴  Karapanagioti, Hrissi K.⁵  Werner, David¹ 

[1] Newcastle Univ, Sch Civil Engn & Geosci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

[2] Chinese Acad Geol Sci, Inst Hydrogeol & Environm Geol, Shijiazhuang 050061, Peoples R China

[3] Hebei Key Lab Groundwater Remediat, Shijiazhuang 050061, Peoples R China

[4] Univ Eastern Finland, Dept Biol, FI-80101 Joensuu, Finland

[5] Univ Patras, Dept Chem, Patras 26500, Greece

关键词: PAHs;    Sediment remediation;    Magnetic activated carbon;    Ecotoxicity;   

DOI  :  10.1016/j.jhazmat.2014.12.030

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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