城市污水污泥与木质纤维素生物质共液化过程中重金属的迁移转化行为。
The migration and transformation behavior of heavy metals during co-liquefaction of municipal sewage sludge and lignocellulosic biomass.
机构信息
School of Resources, Environmental & Chemical Engineering and Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang University, Nanchang 330031, China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
出版信息
Bioresour Technol. 2018 Jul;259:156-163. doi: 10.1016/j.biortech.2018.03.019. Epub 2018 Mar 7.
Co-liquefaction of municipal sewage sludge (MSS) and heavy metal (HM) contaminated lignocellulosic biomass (rice straw or wood sawdust) was conducted at 300 °C with ethanol as the solvent to study the transformation behavior of HMs (e.g., Cu, Cd, Pb, Cr, Zn, and Ni). The results indicate that HMs in rice straw or wood sawdust transferred heavily to bio-oils (up to 10-25% of the total Cu, Cd, and Zn) when they were liquefied individually, compared with MSS with only ∼5% distributed to bio-oil. The bio-available fraction of HMs in bio-chars and bio-oils produced from liquefaction of individual biomass were assessed to show medium to high risk to the environment. Co-liquefaction promoted the distribution of HMs to solid bio-char. Moreover, co-liquefaction benefited the immobilization of HMs in bio-chars and bio-oils. Synergistic effects were found for HMs immobilization during co-liquefaction.
采用乙醇作为溶剂，在 300°C 下对城市污水污泥 (MSS) 和重金属 (HM) 污染的木质纤维素生物质（稻草或木屑）进行共液化，以研究 HMs（例如 Cu、Cd、Pb、Cr、Zn 和 Ni）的转化行为。结果表明，与 MSS 相比，当单独液化时，稻草或木屑中的 HMs 大量转移到生物油中（总 Cu、Cd 和 Zn 的 10-25%），而 MSS 中只有约 5%分配到生物油中。评估了从单个生物质液化产生的生物炭和生物油中 HMs 的生物有效分数，表明对环境具有中到高的风险。共液化促进了 HMs 在固体生物炭中的分布。此外，共液化有利于 HMs 在生物炭和生物油中的固定。在共液化过程中发现了 HMs 固定的协同效应。
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