渗滤液循环回灌厌氧填埋层前后的分类表征

VARIATION CHARACTERISTICS OF ISOLATED FRACTIONS FROM LEACHATE RECIRCULATING THROUGH ANAEROBIC LANDFILL LAYER

以上海老港垃圾填埋场调节池的渗滤液及其经厌氧垃圾填埋柱循环回灌处理后的出水为研究对象,用树脂吸附和离子交换技术将其中的溶解性有机物(DOM)分类为腐殖酸(HA)、富里酸(FA)和亲水性(HyI)部分,并对此三类DOM进行含量、酸度、比紫外吸收值(SUVA254)及分子量分布测定分析。结果表明:渗滤液经厌氧垃圾填埋柱循环回灌后,HA和FA所占比例增加,HyI所占比例下降;弱酸基官能团含量升高,羧基官能团含量降低;HA、FA和HyI部分的SUVA254均提高;DOM分子量分布由1k以下的占83.5%降为46.1%。

Leachate sampled from the regulation tank of Laogang Landfill was recirculated through an anaerobic landfill column. Dissolved organic matters (DOM) in the respective leachates before and after recirculation was fractionated into humic acids (HA), fulvic acids (FA) and hydrophilic (HyI) fractions by adsorption and ion exchange resins. Concentration, acidity, specific ultraviolet absorbance (SUVA254) and molecular weight distribution (MWD) of these fractionations were analyzed. The results showed that, after recirculation, the ratios of HA and FA to DOM increased while that of HyI to DOM decreased. More weakly acidic groups enriched in the leachate while the content of the carboxylic groups was lessened. The increments were found in the SUVA254 of HA, FA and HyI. The content of DOM with MWD below 1k declined from 83.5% to 46.1%.