城市湖泊沉积物中典型PhACs的迁移转化机制及风险评估

As important reservoirs of contaminants,the urban lake sediments play an important role on the migration and transformation of the contaminants in the environment. As emerging contaminants, pharmaceutically active compounds (PhACs) were concerned increasingly. But study on the migration and transformation and risk of PhACs in urban lake sediments is poorly reported. In this project, Dianshan Lake in Shanghai will be selected as study area.The occurrence and source of PhACs in sediments of Danshan Lake will be studied. The migration and transformation mechanism of PhACs in the urban lake sediments will be investigated through the field monitor, laboratory physical model and numerical simulation. The transport model of PhACs in the lake sediment-overlying water interface will be developed to predict the impact of overlying water on urban lakes. Based on the bioavailability and form of PhACs, the risk assessment model of PhACs will be also optimized. The ecological risk and health risk assessment of PhACs in the urban lake sediments will be conducted, and the impact of deposition time on the ecological risks of PhACs will be revealed.This project will provide the theoretical support for the control of PhACs in urban lake in China.

城市湖泊沉积物作为城市环境污染物重要的蓄积库与归宿地，对污染物在环境中的迁移转化起着重要的作用。药物活性化合物(PhACs)作为一类典型的“新兴”污染物，正在受到越来越多的关注，但其在城市湖泊沉积物中的迁移转化机制和潜在风险尚不清晰。本项目拟选取淀山湖为研究区域，系统研究淀山湖沉积物中PhACs的分相、分态赋存特征，解析其污染来源；通过现场监测、实验室物理模型和数值模拟等手段，深入研究典型PhACs在城市湖泊沉积物中的迁移转化机制，建立PhACs在城市湖泊沉积物-上覆水界面的迁移模型，预测其对城市湖泊上覆水体的影响；从PhACs不同赋存形态和生物有效性角度，优化PhACs的风险评价模型，对城市湖泊沉积物中PhACs进行生态风险和健康风险评估，明确城市湖泊沉积物中的高风险因子，并探讨沉积时间变化对PhACs潜在风险的影响。研究结果可为我国城市湖泊生态环境中PhACs的污染控制提供理论依据。

城市湖泊沉积物作为城市环境污染物重要的蓄积库与归宿地，对污染物在环境中的迁移转化起着重要的作用。药物活性化合物(PhACs)作为一类典型的“新兴”污染物，正在受到越来越多的关注，但其在城市湖泊沉积物中的迁移转化机制和潜在风险尚不清晰。本项目选取淀山湖为研究区域，系统研究了淀山湖沉积物中PhACs的分相、分态赋存特征和时空变化规律；使用逸度模型LevelⅢ模型进一步模拟了PhACs在淀山湖地区的多介质环境归趋，验证了与实测数据的一致性。研究了沉积物中典型PhACs的迁移转化机理，全面探讨了沉积物中溶解性有机质、钙镁阳离子、pH值、温度等环境因素对PhACs迁移转化的影响机制，考察了不同沉积物组分对PhACs的吸附特性。研究了重金属污染物Cu存在条件下，对典型PhACs在沉积物上的吸附行为的影响。采用上覆水、沉积物孔隙水中典型PhACs的赋存浓度对淀山湖沉积物系统进行了生态风险评价，通过健康风险评价模型对淀山湖水体中典型PhACs进行了人体健康风险评估。研究结果可为我国城市湖泊生态环境 PhACs的污染控制提供理论依据。