焦化废水生物出水溶解性有机物特性光谱表征

Spectral characterization of dissolved organic matter in bio-treated effluent of coking wastewater

利用非离子型DAX-8树脂和离子型交换树脂对某焦化废水二级生物出水溶解性有机物(DOM)进行组分分离,从溶解性有机碳(DOC)、紫外-可见光谱、三维荧光光谱、傅立叶变换红外光谱(FT-IR)等4个方面对组分进行光谱学分析与特征识别.结果显示,疏水性酸性物质(Ho A)、亲水性酸性物质(Hi A)和亲水性中性物质(Hi N)为DOM的主要组分,其DOC含量占总DOC的39.88%、20.85%、25.38%;DOM主要含有单环芳香族化合物或共轭双键类化合物成分,类腐殖质物质和类富里酸物质是DOM的特征有机物;低分子量有机物在亲水性物质组分(HIS)中含量最高,E2 54/E3 65=3.89,E445/E665=1.91,SR=0.926均证明了这一点;亲水性碱性组分(Hi B)组分UV254占比为32%,SUVA值为49.94 L·mg-1·cm-1,不饱和物质和芳香性物质含量最高,芳香化程度最高;Ho A的E300/E400值为2.58,腐化程度最高,组分中含有类富里酸物质.DOM光谱分析能够提供组分中亲疏水性物质的比例、芳香性高低、分子量、发色团及有机基团等信息,可以作为判断废水特征的参考依据.

Fractionation of dissolved organic matter （ DOM ） in the bio？treated effluent of coking wastewater was conducted by non-ionic DAX？8 resin and ion exchange resins. Characterization methods included dissolved organic carbon （ DOC ） , UV-visible spectroscopy, three？dimensional fluorescence spectroscopy and Fourier transform infrared （ FT-IR） spectroscopy. The results showed that hydrophobic acid （ HoA ） , hydrophilic acid （ HiA ） and the hydrophilic neutral （ HiN ） substance were the main components of DOM, accounting for 39. 88%, 25. 38%, 20. 85%, respectively. DOM was mainly composed of single？ring aromatic compounds or conjugated double bond compounds. Based on the UV？visible spectroscopic data （ E254/E365=3. 89, E4 45/E665=1. 91, SR=0.926）, it suggested that organic compounds with low MW（molecular weight） were the main component of hydrophilic substances （HIS） fraction. The hydrophilic acid （HiB） fraction featured as the component with the highest degree of aromatic and the most abundant of unsaturated aromatic substances, according to the results that UV254 accounted for 32%, SUVA=49. 94 L·mg^-1·cm^-1 . HoA may contained like-fulvic substances and had the highest degree of humification （ E300/E400=2？58） . DOM characterization with spectral analysis methods convey messages of the proportions of hydrophilic and hydrophobic substances, the degree of aromatic, molecular weight, chromophore and organic groups, which can be considered as references to determine the characteristics of wastewater.