城市污水厂尾水中DOM的树脂分离及光谱表征

发布时间：2018-03-14 08:53

  本文选题：城市尾水　切入点：淬灭剂　出处：《安徽建筑大学》2017年硕士论文　论文类型：学位论文

【摘要】：由于现代城市污水收集与处理率的提高,污水的循环利用显得愈发重要。在城市污水厂处理工艺中,常规指标的处理和分析技术已经很成熟,但对处理后尾水中有机物污染的处理与分析研究较少。在城市污水厂排放的尾水中,物质种类繁多,且相对浓度较低。传统化学分析方法的局限性,导致物质的快速表征以及定量分析难以实现,而分子光谱以其快速、灵敏的特点成为许多有机物快速表征的方法。本文主要利用荧光、紫外、中红外光谱信息结合化学计量法所测值对城市尾水及纳污河流水样中DOM的组分、特性进行了研究分析。主要内容及结果分析如下:1.利用三维荧光光谱扫描技术获取尾水中蛋白质、腐殖质的荧光光谱信息,利用Domflour和PARAFAC分析方法,提取主成分信息,了解尾水中溶解性有机物的组成。研究表明:城市尾水中溶解性有机物主要分为蛋白质与腐殖质两大类,蛋白质主要分为络氨酸与色氨酸两种物质,腐殖质物质主要分为胡敏酸与富里酸物质。同时比较了纳污河流上下游水样,说明污水厂的出水对河流中有机污染物起到一定的稀释净化作用。2.应用XAD-8树脂与阴阳离子交换树脂连用技术对低浓度的DOM水样进行富集分离,得到憎水性物质:憎水性碱(HOB)、憎水性酸(HOA)、憎水性中性物质(HON),亲水性物质:亲水性碱(HIB)、亲水性酸(HIA)、亲水性中性物质(HIN)。调解PH值至中性,于室温条件下进行三维荧光光谱扫描,结合中红外光谱信息以及TOC的测定,得出憎水性物质占总有机碳含量的75%左右,憎水性物质HOA、HOB主要包含一些荧光性有机物如蛋白质、磷酸盐化合物、有机酸等物质,其中憎水性酸性物质为憎水性物质的主要组成成分。亲水性物质HIB、HIA、HIN主要包含了一些非荧光性有机物质如多糖、脂类等。3.以常见的腐殖质物质胡敏酸和富里酸为研究对象,利用紫外、三维荧光光谱对物质特殊化学键信息的提取,联合利用化学计量法所测参数值,研究水样中淬灭剂Fe(Ⅲ)的赋存状态,并建立尾水中溶解性有机物的识别模型。结果揭示:胡敏酸和富里酸存在荧光淬灭现象,并符合Stern-Volmer公式:I/I_0=1-f_c*K_c*[c]/(1+K_c*[c])。其中胡敏酸物质的紫外光谱基本不受Fe(Ⅲ)的影响,联合其三维荧光-紫外光谱,经过非线性拟合后构建了淬灭剂Fe(Ⅲ)赋存状态的识别模型,并进行了实际样品的预测,效果良好。
[Abstract]:Due to the improvement of sewage collection and treatment rate, the recycling of sewage becomes more and more important. In the treatment process of municipal wastewater treatment plant, the treatment and analysis technology of conventional indexes is very mature. However, there are few studies on the treatment and analysis of organic matter pollution in the rear tail water. In the tail water discharged from the municipal wastewater treatment plant, there are many kinds of substances and the relative concentration is low. The limitation of the traditional chemical analysis method, The rapid characterization and quantitative analysis of substances are difficult to achieve, and molecular spectroscopy is a rapid and sensitive method for the characterization of organic compounds. The components of DOM in the water samples of urban tailings and polluted rivers were determined by the mid-infrared spectrum information combined with the chemometrics method. The main contents and results are as follows: 1. The fluorescence spectrum information of protein and humus in the tail water was obtained by using three dimensional fluorescence spectrum scanning technique, and the principal component information was extracted by Domflour and PARAFAC analysis. To understand the composition of dissolved organic matter in the tail water, the study shows that the dissolved organic matter in the urban tail water is mainly divided into two categories: protein and humus, and protein is mainly divided into two kinds of substances: complex aminoic acid and tryptophan. Humus substances are mainly divided into Hu Min acid and fulvic acid. At the same time, the upstream and downstream water samples of polluted rivers are compared. It is shown that the effluent of the wastewater treatment plant has a certain dilution and purification effect on organic pollutants in the river. 2. Using XAD-8 resin and anion exchange resin to enrich and separate the low concentration DOM water sample. The hydrophobic substances: hydrophobic alkaloids, hydrophobic acid, hydrophobic acid, hydrophobic neutral, hydrophilic substances: hydrophilic alkaloid, hydrophilic acid, hydrophilic neutral, hydrophilic neutral, and hydrophilic neutral were obtained. The pH value was adjusted to neutral, and the three dimensional fluorescence spectra were scanned at room temperature. Combined with the information of mid-infrared spectroscopy and the determination of TOC, it is concluded that hydrophobic substances account for about 75% of the total organic carbon content. The hydrophobic substance HOAHO-HOB mainly contains some fluorescent organic substances such as proteins, phosphate compounds, organic acids, etc. The hydrophobic acid compounds are the main components of hydrophobic substances. The hydrophilic substances HIBHIAHIN mainly contain some non-fluorescent organic substances such as polysaccharides, lipids, etc. The existence of quenching agent Fe (鈪，

本文编号：1610494