三维荧光技术对高浓度有机物地下水处理效果的评价

Evaluation of Performance for Treatment of Groundwater Containing Highly Concentrated Organic Matter with 3-Dimensional Excitation and Emission Matrix Technology

研究了不同技术（强化混凝、活性炭吸附和Fenton氧化）处理高有机含量地下水的效果和可行性，同时采用三维荧光技术表征了不同技术对水中有机物的去除特征。三维荧光分析显示原水存在两个荧光峰：peak1波长区间为A。庐250～280／380～450，peak2波长区间位于AEx/Em=300～330／390～410，二者均为腐植酸类物质。采用pH调节一强化混凝、活性炭吸附和Fenton氧化均可有效去除水中的有机物。当PAC、活性炭投加量分别为300mg／L和0．6g／L时，DOC从17．9mg／L分别降低到5．99和7．60mg／L。同样，反应初始pH值为3、过氧化氢投加量为0．5％（v／v）、亚铁和双氧水物质的量比为0．05时，出水DOC降至5．7mg／L。经处理后，原水色度基本消除。伴随着三种技术的处理，水中荧光强度逐渐削弱，此结果和总有机碳的分析结果表现出良好的一致性。

The effect and feasibility of different technologies such as enhanced coagulation, activated adsorption and Fenton oxidation on organics removal in groundwater contained highly concentrated organic matter was investigated, and DEEM was used to de- scribe the characteristics of organic removal by three processes. DEEM analysis indicates that two fluorescent peaks appear in source water, namely peak 1-λEx=250-280/380-450 and peak 2-λEx/Em=300-330/390-410, and both of them are humic-like organics. Organic matters can be effectively removed by pH adjustment-enhanced coagulation, activated carbon adsorption and Fenton oxida- tion. When the dosages of PAC and activated carbon are 300 mg/L and 0.6 g/L, DOC concentration are decreased to 5.99 and 7.6 mg/L respectively. Furthermore, DOC are reduced to 5.7 mg/L when the initial pH, hydrogen peroxide dosage and molar ratio of fer- rous and hydrogen peroxide are 3, 0.5 % （V/V） and 0.05, respectively. Color is removed by three technologies. Fluorescent intensity of two peaks is weakened by three technologies, which is consistent with results of DOC analysis.