Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental and Resource Sciences, Zhejiang A & F University, Hangzhou, Zhejiang, 311300, China.
Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental and Resource Sciences, Zhejiang A & F University, Hangzhou, Zhejiang, 311300, China; Biochar Engineering Technology Research Center of Guangdong Province, School of Environment and Chemical Engineering, Foshan University, Foshan, Guangdong, 528000, China; Guangdong Dazhong Agriculture Science Co. Ltd., Hongmei Town, Dongguan, Guangdong, 523169, China.
Chemosphere. 2018 May;198:450-459. doi: 10.1016/j.chemosphere.2018.01.162. Epub 2018 Feb 3.
Biochar effect on the potential mobility of dibutyl phthalate (DBP), cadmium (Cd), and lead (Pb) in co-contaminated soils is not well investigated. A laboratory leaching study was conducted to evaluate the effect of biochars derived from bamboo (BB) and pig (PB) on the leachability of DBP, Cd, and Pb through soil columns packed with two soils with low or high organic carbon content (LOC; 0.35% C: HOC; 2.24% C) and spiked with DBP, Cd, and Pb. Application of PB to the LOC soil significantly (P < 0.05) reduced the leaching loss by up to 88% for DBP, 38% for Cd, and 71% for Pb, whereas its impact was insignificant in the HOC soil. The higher efficacy of PB in reducing the leaching of DBP, Cd, and Pb in the LOC soil than that of BB might be related to PB's higher specific surface area, surface alkalinity, pH, and mineral contents compared to those of BB. Co-contamination of Cd and Pb enhanced leaching of DBP in the LOC soil treated with PB, possibly by competition for the sorption sites. Leaching of DBP, Cd, and Pb were significantly (P < 0.05) higher in the LOC soil than in the HOC soil. This study revealed that the effectiveness of biochars was dependent on the soil organic carbon content. Application of PB to the LOC soil was effective in reducing the leaching risk of DBP, Cd, and Pb.
生物炭对同时污染土壤中二丁基邻苯二甲酸酯（DBP）、镉（Cd）和铅（Pb）潜在迁移性的影响尚未得到充分研究。本研究采用土柱淋溶实验，评估了来源于竹子（BB）和猪（PB）的生物炭对低（LOC；0.35% C）和高有机碳含量（HOC；2.24% C）土壤中 DBP、Cd 和 Pb 淋溶的影响，土壤中添加了 DBP、Cd 和 Pb。与 LOC 土壤相比，在 HOC 土壤中，施加 PB 可显著（P < 0.05）减少 DBP 的淋失，降幅高达 88%，减少 Cd 的淋失，降幅为 38%，减少 Pb 的淋失，降幅为 71%。然而，在 HOC 土壤中，施加 PB 对减少 DBP、Cd 和 Pb 淋失的影响并不显著。与 BB 相比，PB 具有更高的比表面积、表面碱性、pH 值和矿物含量，这可能是 PB 在 LOC 土壤中降低 DBP、Cd 和 Pb 淋失的效率更高的原因。Cd 和 Pb 的共污染可能通过竞争吸附位点，增加了 PB 处理的 LOC 土壤中 DBP 的淋溶。LOC 土壤中 DBP、Cd 和 Pb 的淋溶明显高于 HOC 土壤。本研究表明，生物炭的有效性取决于土壤有机碳含量。在 LOC 土壤中施加 PB 可有效降低 DBP、Cd 和 Pb 的淋溶风险。
