矿化垃圾反应床处理垃圾渗滤液出水中的水溶性有机物

Research on dissolved organic matter (DOM) in the leachate effluent of aged refuse biofilter

以矿化垃圾反应床处理垃圾渗滤液出水(以下简称尾水)为研究对象,采用国际上最常用的树脂联用法,对其进行梯度分离表征。研究结果表明,憎水性腐殖质对尾水COD和溶解性有机碳(DOC)的贡献分别为42.55%和45.12%,准亲水性物质对尾水中COD和DOC的贡献分别为34.89%和37.14%,憎水性腐殖质和准亲水性物质是尾水中水溶性有机物(DOM)的重要组成部分。近紫外区域吸光度分析发现,尾水中含有大量带共轭双键或苯环的有机物质,这些物质从尾水中去除后,尾水在近紫外区域的吸光度明显下降。分子量分布显示,尾水中DOM的分子量主要集中在2000u以下。元素分析和红外光谱结果显示,胡敏酸(HA)和富里酸(FA)带有苯环结构,存在醇羟基或酚羟基及羧酸官能团;准亲水性物质含有较多的羧酸官能团,另外存在一定量的羟基官能团,同时还可能含有三键和双键的结构。

Macroporous resins extraction method was adopted for the fractionation and characterization of final leachate effluent from aged refuse biofilter. The results demonstrated that hydrophobic humie substances accounted for 42.55% and 45.12% of chemical oxygen demand （COD） and dissolved organic carbon （DOC） respectively and transphilic substances accounted for 34.89% and 37. 14% of COD and DOC, respectively. The hydrophobic humic substances and transphilic substances consisted of main dissolved organic matters in the leachate effluent. Absorbency results indicated that the leaehate effluent was composed of organic matters, which had conjugated double bond or benzene ring. After the removal of organic matters, absorbency value dropped greatly. Furthermore, from the analysis results of molecular weight distribution, it could be seen that the molecular weight of dissolved organic matter in the leachate effluent was below 2 000 u （additionally, the analysis results of element constitution and functional group showed that humic acid （HA） and fulvic acid （FA） had benzene ring, hydroxyl and carboxylic group. The transphilic substances had relatively more carboxylic functional group, definite hydroxyl group and also triple and double bond.