中文摘要：

为进一步改善土壤含水层处理（SAT）系统对城市污水处理厂二级处理出水中溶解性有机物（DOM）的去除效果，在传统SAT系统中以不同的混合比例及填充方式加入粉煤灰对其进行改性，并通过紫外254nm处吸光度（UV254）、溶解性有机碳（DOC）、比紫外吸收值（SUVA）及三维荧光光谱（EEM）技术对二级处理出水中三卤甲烷（THMs）前体物在粉煤灰改性SAT系统中的去除情况进行探讨．粉煤灰改性SAT系统对二级处理出水中的UV254、DOC、SUVA及三卤甲烷生成势（THMFP）的去除效果优于传统SAT系统．粉煤灰添加量的增加能大幅度提高SAT的处理效果，但会影响土壤中微生物的活性，故有效结合粉煤灰的吸附性与土壤层的生物降解作用可提高sAT的处理效果．量化的荧光强度数据表明，粉煤灰改性SAT系统可有效去除二级处理出水中以络氨酸类芳香性蛋白质、腐殖酸及富里酸类物质为主的THMs前体物．

英文摘要：

To further improve the removal of the dissolved organic matter （DOM） in secondary effluent during the laboratory-scale soil aquifer treatment （ SAT）, fly-ash （FA） was added to the traditional soil columns as an additive in different proportions and filling patterns. Removal and transformation of the trihalomethanes （THMs） precursors in secondary effluent in the FA-additive SAT system was investigated by the analysis of ul- traviolet absorbance at 254 nm （UV254 ）, dissolved organic carbon （DOC）, specific ultraviolet light absor- bance （SUVA） and excitation-emission matrix （EEM） fluorescence spectroscopy. The FA-additive enhanced the reduction of DOC, UV254, SUYA and THMFP efficiently. The increasing of FA dosage would lead to a high removal efficiency of DOM during SAT operation, but the biodegradation of the columns was negatively affected. Experimental results demonstrated that the combination of FA adsorption and biodegradation in soil could achieve a better removal of DOM. Fluorescence intensity showed that the FA-additive could effectively remove aromatic acid proteins, humic-like and fulvic-like materials （THMs precursors） in secondary effluent.