污泥重金属在林地土壤中的迁移转化机制及其环境风险：凋落物的影响

项目名称： 污泥重金属在林地土壤中的迁移转化机制及其环境风险：凋落物的影响

项目编号： No.31270675

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 农业科学

项目作者： 曾曙才

作者单位： 华南农业大学

项目金额： 81万元

中文摘要： 我国城市污泥产量巨大，处置困难，资源化利用是重要发展方向。由于含有重金属等有害物质，污泥农用受到极大限制。林地远离人类食物链，是污泥资源化利用的理想场所，但是必须高度关注污泥重金属在林地的迁移转化、环境风险及其影响因子。基于以往相关研究，凋落物可能是森林中影响污泥重金属迁移转化的最突出因子。因此，本项目将研究污泥重金属铜、锌、铅、镉在林地土壤中的迁移转化特征及其环境风险，并在林地现场、室外模拟和室内淋洗条件下探讨不同树种凋落物对污泥重金属在土壤中迁移转化的影响，建立现场、室外和室内结果的印证关系。接着，通过研究凋落物对污泥重金属存在形态的影响、凋落物淋滤液优势有机组分对污泥重金属迁移转化和吸附-解吸行为的影响，并通过HPLC-ICP-MS确定污泥重金属淋溶迁移的有机络合物形态，最终揭示林木凋落物对污泥重金属在林地土壤中迁移转化机制及环境风险的作用，为城市污泥林地资源化利用提供科学依据。

中文关键词： 污泥；重金属；迁移；林地；凋落物

英文摘要： In China, sewage sludge output is enormous and the disposal is a big problem. Utilization of sludge as a fertilizer resource is a promising solution. Due to the heavy metals and other harmful substances in sludge, application of sludge in farmland is increasingly restricted. Forest land is far away from human food chain and can be a desirable place for sludge application and disposal. However, great attention should be paid to the leaching and transformation of sludge heavy metals, the environmental risk and influencing factors. Based on the previous research, forest litter is expected to be the most prominent factor influencing the movement and transformation of sludge heavy metals in the forest. Therefore, this project will monitor the transfer characteristics and environmental risk of copper, zinc, lead and cadmium in sewage sludge in forest soil. Field, outdoor simulation and indoor leaching experiments will be conducted to study the effects of different litters on the transfer of sludge heavy metals in planted forest soil, and a mutual confirming relationship will be established upon the field, outdoor and indoor experiment results. Then, we will try to understand the effects of forest litters on the existing forms of heavy metals in soil and the influences of dominant organic components of litter leachate

英文关键词： sewage sludge；heavy metals；transfer；forest land；litterfall