环境化学
薛爽,赵庆良,魏亮亮,马溪平.氯化对二级处理出水中溶解性有机物荧光特性的影响[J].环境科学学报,2010,30(7):1418-1424
氯化对二级处理出水中溶解性有机物荧光特性的影响
- Effect of chlorination on the fluorescence characteristics of dissolved organic matter in secondary treated effluents
- 基金项目：辽宁省科技厅项目(No.2005229003,200601117-232);辽宁大学“211”基金
- 作者
- 单位
- 薛爽
- 辽宁大学 环境学院, 沈阳 110036;辽宁省高校污染控制与环境修复重点实验室, 沈阳 110036
- 赵庆良
- 哈尔滨工业大学 市政环境工程学院, 哈尔滨 150090;哈尔滨工业大学 城市水资源与水环境国家重点实验室, 哈尔滨 150090
- 魏亮亮
- 哈尔滨工业大学 市政环境工程学院, 哈尔滨 150090;哈尔滨工业大学 城市水资源与水环境国家重点实验室, 哈尔滨 150090
- 马溪平
- 辽宁大学 环境学院, 沈阳 110036;辽宁省高校污染控制与环境修复重点实验室, 沈阳 110036
- 摘要：以哈尔滨市W污水处理厂为研究对象,利用XAD树脂对二级处理出水中的溶解性有机物(DOM)进行分级分离.按照DOM在不同树脂上的吸附特性将其分为5个部分:疏水性有机酸(HPO-A)、疏水性中性有机物(HPO-N)、过渡亲水性有机酸(TPI-A)、过渡亲水性中性有机物(TPI-N)和亲水性有机物(HPI).考察了DOM各组分在氯化过程中荧光特性的变化.研究结果表明,DOM中的类腐殖酸荧光物质、类溶解性微生物代谢产物荧光物质和类芳香族蛋白质荧光物质参与了氯化反应.此外,HPO-A、HPO-N、TPI-A和TPI-N中的类富里酸荧光物质,HPO-A、HPO-N和TPI-A中带有3～5个稠合苯环的芳香族化合物,以及HPO-N中的萘及其衍生物与氯反应.TPI-N和HPI与氯反应后,生成了具有多环芳香结构的荧光物质.HPI与氯反应后生成了类富里酸荧光团.各DOM组分与氯反应后,在激发波长为320nm的荧光发射光谱图上波长大于与该光谱图上最高荧光强度对应的波长的范围内,与最高荧光强度的一半等值的荧光强度相对应的波长变短,其中以TPI-N和HPI最为显著.而这种现象在激发波长为280nm和370nm的荧光发射光谱图却没有被观察到.
- Abstract：Dissolved organic matter in secondary treated effluents from the W Wastewater Treatment Plant in the city of Harbin was fractionated using XADresins into 5 fractions:hydrophobic acid (HPO-A),hydrophobic neutral (HPO-N),transphilic acid (TPI-A),transphilic neutral (TPI-N) and hydrophilic fraction (HPI). The fluorescence characteristics of each DOMfraction during chlorination were examined. The results showed that humic acid-,soluble microbial byproducts-and aromatic protein-like fluorescent materials in DOMwere involved in chlorination. In addition,fulvic acid-like fluorescent materials in HPO-A、HPO-N、TPI-Aand TPI-N,polycyclic aromatics with three to five fused benzene rings in HPO-A、HPO-Nand TPI-A,as well as naphthalene with its derivatives in HPO-Nreacted with chlorine. Fluorescent materials with polycyclic aromatic structures were produced in TPI-Nand HPI,and fulvic acid-like fluorophores in HPIas well,as a result of chlorination. The wavelength that corresponds to the position of the normalized emission band at its half-intensity (for wavelengths > the wavelength at which the maximum emission intensity is observed) was measured in the fluorescence emission spectra (excitation at 320 nm) for each fraction decreased after chlorination,which was significant for TPI-Nand HPI. But the phenomenon was not observed in the fluorescence emission spectra with excitation wavelengths of 280 nm and 370 nm.
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