垃圾渗滤液厌氧降解中溶解性有机物的光谱特性

为探讨渗滤液厌氧降解出水中有机物的构成特点和变化规律,采用XAD-8和XAD-4树脂将溶解性有机物(DOM)依亲疏水性和酸碱性特征分为5种组分,对不同水力停留时间(HRT)下厌氧序批式反应器(ASBR)出水中各组分的含量和特性进行了比较研究.结果表明:ASBR处理渗滤液中溶解性有机碳(DOC)去除率可达53.0%～94.7%;芳香类物质多存在于疏水性组分中,厌氧处理后各组分UV254明显下降,芳香类、羧酸和氨基化合物去除明显;随着HRT的延长,富里酸类荧光物质易在出水中累积而造成累计荧光强度Фi,n增大,而芳香性蛋白及溶解性微生物副产物较之更易降解.可见ASBR能有效降解渗滤液DOM各组分物质.

Spectral Properties of Dissolved Organic Matter in Landfill Leachate During Anaerobic Degradation

To investigate the characteristics of dissolved organic matter(DOM)from anaerobic treated landfill leachate,the impact of hydraulic retention time(HRT)on the effluent organic matter of anaerobic sequencing batch reactor(ASBR)was analyzed.Fractionation procedure using XAD-8 and XAD-4 resins was adopted to separate the leachate DOM into five fractions according to the hydrophobic-hydrophilic and acidic-basic properties.The results revealed that leachate was efficiently existed with the dissolved organic carbon(DOC)removal efficiency of 53.0%— 94.7%.Aromatic compounds mostly existed in hydrophobic fractions.The value of UV254 for each fraction was de-creased after the anaerobic degradation,as well as the content of aromatic compounds,carboxylic acids,and amide groups.The fulvic acid-like fluorescence compounds accumulated in the effluent as the HRT was prolonged,resulting in the increase of volumetric interpretation(Фi,n),while the aromatic-protein and soluble microbial by-product-like fluorescence compounds were more easily degraded.The study showed the efficient degradation of DOM fractions in leachate during ASBR treatment.