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城市污水处理厂出水作为再生水的主要水源,其迥异的物质组成给受纳水体带来潜在环境风险。全面掌握污水厂出水水体中有机物组成及结构信息,将为污水厂提标改造及有毒有害物质排放标准的制定提供理论支撑。采用傅里叶变换红外光谱和三维荧光光谱技术,结合二阶导数光谱及区域积分分析方法,对4个典型城镇污水处理厂(W1,W2,W3,W4)出水水体中颗粒态有机物(POM)与溶解态有机物(DOM)的物质组成及结构差异特征进行了分析。结果显示:污水处理厂出水中POM主要组分为脂肪类、芳香类、糖类及矿物盐,而DOM主要由有机酸、蛋白质、多肽、糖类及芳香类物质组成。各污水处理厂出水水体POM中,W1芳香类物质较多而矿物盐类等颗粒较少,W2较W1含有更多的糖类物质,W3含较多脂类、蛋白类及糖类,而W4含有芳香类及羧酸物质的有机物较多。水体DOM组成中,W1和W2成分较为类似,主要为芳香性较高的大分子有机酸,其含量分别占总有机物的73.9%和67.7%;W3与W4组成中蛋白、多肽及糖类含量较高,其中类蛋白物质分别占DOM总量的71.3%和53.5%。研究结果表明,采用傅里叶变换红外光谱结合二阶导数分析能很好识别不同污水处理厂出水水体中POM与DOM主要物质组成及结构差异,同时利用区域积分方法对样品三维荧光光谱进行解析,能更进一步定量分析不同来源样品物质组成特征。
As the main water source of reclaimed water, the effluent of urban sewage treatment plants has a potential environmental risk to the receiving water body due to its different substance composition. To fully understand the composition and structure of organic matter in effluent bodies of wastewater treatment plants will provide theoretical support for the standardization of sewage treatment plants and the development of emission standards for toxic and hazardous substances. Using Fourier transform infrared spectroscopy (FTIR) and three-dimensional fluorescence spectroscopy (FTIR), combined with second-order derivative spectroscopy and the method of regional integration analysis, the particulate organic matter (POM) in effluent bodies of four typical urban WWTPs (W1, W2, W3, And dissolved organic matter (DOM) material composition and structural differences were analyzed. The results showed that the main components of POM in effluent from sewage treatment plants were fat, aromatic, sugar and mineral salts, while DOM mainly consisted of organic acids, proteins, peptides, sugars and aromatic substances. In POM effluent bodies, W1 has more aromatic substances and less mineral salts, W2 contains more sugars than W1, W3 contains more lipids, proteins and sugars, while W4 Contains aromatic and carboxylic acid substances more organic. Among the components of DOM, the contents of W1 and W2 are similar, mainly the macromolecular organic acids with high aromaticity, accounting for 73.9% and 67.7% of the total organic matter respectively. The content of protein, polypeptide and carbohydrate in W3 and W4 High, of which class protein material accounted for 71.3% and 53.5% of the total DOM. The results show that using Fourier transform infrared spectroscopy combined with second-order derivative analysis can well identify the composition and structure differences of POM and DOM in different effluent from sewage treatment plants, and analyze the three-dimensional fluorescence spectra by using the method of region integration. Can further quantitative analysis of the composition of the material characteristics of different samples.