稠油废水中溶解性有机物的分离和表征

ISOLATION AND CHARACTERIZATION OF DOM FROM HEAVY OIL

利用XAD-8大孔吸附树脂将稠油废水中的溶解性有机物进行分离,对稠油废水DOM及各分离组分进行TOC、UV254、硬度、Ca2+、Mg2+浓度等的测定,并采用官能团滴定、红外光谱等分析方法对稠油废水进行表征。结果表明:稠油废水中DOM以包括腐殖酸和富里酸两部分物质的憎水部分为主,两者分别占总TOC的18.64%和43.58%,亲水部分仅占9.35%,同时还有一部分有机物未分离出;紫外吸光度结果表明,稠油废水及各组分的芳香化程度为:腐殖酸>富里酸>稠油废水>亲水部分;官能团滴定结果表明,各组分的总酸度大小为富里酸>腐殖酸>亲水部分;稠油废水中DOM及各组分的硬度和Ca2+、Mg2+分布分析结果表明,腐殖酸和富里酸均和Ca2+、Mg2+发生反应,由此可推断由于腐殖酸和富里酸与交换下来的Ca2+、Mg2+的吸附作用导致两者可能因此粘附在大孔弱酸树脂上,从而影响树脂正常运行;红外光谱分析结果与官能团滴定结果一致。

The XAD-8 macroporous adsorption resin was used to isolate the dissolved organic material from heavy oil wastewater, the TOC, UV254 , hardness, concentration of Ca^2 ＋ and Mg^2 ＋ of DOM from heavy oil wastewater and its separated components were measured, and potentiometric titration and infrared spectrum were used to characterize the heavy oil wastewater. The results showed that, DOM from heavy oil wastewater included a hydrophobic part of humic acid （HA） and fulvic acid（FA） mainly, occupied the total TOC 18.64% and 43.58% , respectively, the hydrophilic part（HyI） accounted for only 9.35% , and also a part of organic matter were not isolated. The aromaticity of these fractions followed the order HA 〉 FA 〉 DOM of heavy oil wastewater 〉 HyI. The potentiometric titration indicated that the total organic acidity of these fractions decreased in the order of FA 〉 HA 〉 HyI. The reaction between HA, FA and Ca^2＋ , Mg^2＋ may result in HA and FA adhering to the macroporous weak acid resin, thus affecting its normal operation. The infrared spectrum analysis was in agreement with the potentiometrie titration results.