Briefing: A study on biological remediation and ecotoxicity evaluation of BaPcontaminated soil

摘要

Benzo[a]pyrene (BaP) is a hydrophobic and recalcitrant organic compound that is often identified in contaminated soils and sediments. This study used a short-term biocatalytic method for the remediation of BaP-contaminated soil. Daphnia magna was used to evaluate the toxicity of the treated soil. Reducing the BaP concentration in the soil to lower than 2mg/kg was the ultimate goal. The experimental treatment used a microreactor to measure the amount of carbon dioxide (CO_2) generated by the biocatalytic reaction. The haemoglobin that was not introduced into the reactor resulted in twice the amount of released carbon dioxide, as the haemoglobin was used as a carbon source. A reduction in the BaP concentration from 9·4mg/l to a final concentration of 1·12mg/l demonstrated the ability to restore the soil contaminated with BaP by the biocatalyst and the biodegradability of the coupling mechanism. An ecotoxicity analysis of D. magna was carried out after a 35 d biological treatment process. As a result, the ecotoxicity value was analysed as 0·0 toxic units.