生物炭胶体与重金属在水-土介质中共迁移过程和机制

项目名称： 生物炭胶体与重金属在水-土介质中共迁移过程和机制

项目编号： No.21677129

项目类型： 面上项目

立项/批准年度： 2017

项目学科： 化学工业

项目作者： 方婧

作者单位： 浙江工商大学

项目金额： 30万元

中文摘要： 随着生物炭在土壤污染修复领域的广泛应用，生物炭对土壤重金属迁移性的影响及环境风险评估已经成为一项新的研究热点，但生物炭对重金属迁移性的降低/促进作用至今尚无定论。先前研究通常归因于生物炭性质、土壤性质和重金属种类不同，却未曾关注土壤中生物炭胶体的释放及其与重金属共迁移的作用。本项目选取秸秆生物炭为代表，以子过程解析的方法，研究饱和水-土介质中生物炭胶体与重金属离子的共迁移过程，包括生物炭胶体释放子过程、重金属离子在生物炭胶体上的吸附与解吸子过程、生物炭胶体在水溶液中的团聚子过程、生物炭胶体与重金属离子在水-土介质中迁移和滞留子过程。同时考察生物炭胶体性质及相关环境因子对生物炭胶体与重金属共迁移过程的影响，充分揭示生物炭胶体与重金属共迁移过程的各相界面作用机制。本项目研究结果将有助于深入了解生物炭对土壤重金属迁移性的影响及环境效应，为生物炭技术的应用实施风险最小化战略提供一定的科学依据。

中文关键词： 生物炭；生物炭胶体；重金属；土壤；共迁移

英文摘要： With the wide use of biochar on the remediation of heavy metal contaminated soil, the effect of biochar on the mobility of heavy metals in soil and their risk of environmental health have become a new research hotspot. But so far, the reduction / promotion of heavy metal mobility have not yet been finalized. It is usually attributed to the various natures of biochar, soil properties and the different types of heavy metals. However, the effect of biochar colloids release in soil and their co-migration with heavy metals have never been concerned about. Therefore, the main work will be to investigate the co-migration processes of biochar colloids with heavy metals in saturated porous media, including the sub process of the release of biochar colloids, the sorption and desorption of heavy metals on biochar, the aggregation of biochar, the co-migration and retention of biochar colloids with heavy metals by using straw biochar. Simultaneously, the effect of biochar properties and environmental related factors on the co-migration processes will be also explored to reveal the mechanism of interactions among various phases in the process of co-migration of biochar colloids and heavy metals. The results will be helpful to understand the influence of biochar on soil heavy metal migration and their environmental effects, and provide theoretical basis and support for the implementation of risk minimization strategy for large-scale application of biochar technology.

英文关键词： biochar;biochar colloids;heavy metals ;soil;co-migration