Liao Xiaoyong

多环芳烃（PAHs）在不同腐殖酸组分中的赋存特征和氧化降解效果研究

选取腐殖酸重要组分胡敏酸、富里酸、胡敏素为研究对象，研究了不同老化时间下多环芳烃（PAHs）在腐殖酸各组分中的赋存特征.同时，探究了过硫酸钠、高锰酸钾、芬顿试剂、过氧化氢4种氧化剂氧化PAHs过程中污染物在腐殖酸和上清液中的分布情况，确定胡敏酸、富里酸、胡敏素中PAHs的降解效率.实验结果表明，PAHs在胡敏素中存在吸附滞后现象，老化前期胡敏素对PAHs的吸附速率慢、吸附量少，但老化后期出现吸附量的反超，因此，胡敏素、胡敏酸和富里酸中PAHs的最终吸附量并没有明显差异.高环PAHs在3种腐殖酸组分中的吸附速率和最终吸附量远小于低、中环PAHs.过硫酸钠和高锰酸钾能够较好地去除胡敏酸、富里酸、胡敏素中的大部分PAHs，去除率均在95%左右，芬顿试剂对胡敏酸、富里酸和胡敏素中总PAHs的去除效果差别不大，去除率均在79.36%~88.05%之间；过氧化氢对胡敏酸和胡敏素中PAHs的去除率分别为82.82%和61.77%，而对富里酸中PAHs的去除效果最差，去除率仅为43.96%.过硫酸钠和高锰酸钾是氧化PAHs类有机污染土壤的最佳氧化剂，能够有效提高不同组分腐殖酸中PAHs的去除率.

Comparison of the rise of water level in the typical catchments, Three Gorges Reservoir area

Water level is an important index for studying hydrologic processes. Water level rise processes were studied in three catchments (catchment I, II, III in Chen Jiagou watershed in the Three Gorge Reservoir Area) with different areas to provide useful information to inform data extension from a gauged-catchment to an ungauged catchment. The results showed that there are seasonal changes in the dominant driving mode of the rise of the water level. The rise of the water level in March is likely mainly driven by the mode of stored-full runoff, and in September or October, it is mainly driven by Horton-flow. The correlation coefficients of all indexes were significant among the three catchments, suggesting that these catchments have similarities and that water level data extension is likely to be completed successfully between the large catchment (III-Catchment) and the small catchment (I-Catchment). It was confirmed that there is good similarity between the 0.6 km2 and 6 km2 catchments, and the data correlation is good between the catchments with the area differences in the Three Gorges Reservoir Area. In addition, the rise processes of the water level in the catchments were not only different under the same rain conditions, but this difference could also change with the rain condition.