污水污泥液化过程中重金属的迁移转化行为。
The migration and transformation behavior of heavy metals during the liquefaction process of sewage sludge.
机构信息
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environment Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
出版信息
Bioresour Technol. 2014 Sep;167:144-50. doi: 10.1016/j.biortech.2014.05.119. Epub 2014 Jun 9.
Bio-oils and bio-chars were obtained from sewage sludge (SS) by liquefaction with ethanol (or acetone) as the solvent at the temperature of 280, 320 and 360°C. The migration and transformation of HMs as Pb, Zn, Cu and Ni during liquefaction were thoroughly investigated. Meanwhile, the environmental risk of HMs in the bio-oils and bio-chars was assessed according to the risk assessment code (RAC). The results showed that the liquefaction solvent and temperature significantly affected the redistribution of HMs. HMs distributed mainly into the bio-chars, with less than 10% into the bio-oils. Increasing liquefaction temperature would promote a higher HM content in bio-oils. The environmental risk of HMs in bio-chars was mitigated compared to SS, especially for Ni. However, the environmental risk of Zn and Ni in bio-oils was undesirably high in comparison with bio-chars. It was suggested that the bio-oil should be pretreated before utilization.
生物油和生物炭是通过在 280、320 和 360°C 的温度下用乙醇（或丙酮）作为溶剂使污水污泥（SS）液化而得到的。研究了 Pb、Zn、Cu 和 Ni 等 HM 在液化过程中的迁移和转化。同时，根据风险评估准则（RAC）评估了生物油和生物炭中 HM 的环境风险。结果表明，液化溶剂和温度显著影响了 HM 的重新分配。HM 主要分布在生物炭中，不到 10%进入生物油。提高液化温度会促进生物油中 HM 含量的增加。与 SS 相比，生物炭中 HM 的环境风险得到缓解，尤其是 Ni。然而，与生物炭相比，生物油中 Zn 和 Ni 的环境风险过高。建议在利用前对生物油进行预处理。
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