不同分子量DOM对垃圾渗滤液生物处理组合工艺中DBP和DEHP去除率的影响

Removal of DBP and DEHP with DOM in Combined Landfill Leachate Biotreatment Process

采用小型生物处理组合工艺（上流式厌氧污泥床＋曝气生物滤池＋缺氧反应器＋膜生物反应器,UASB＋BAF＋ANO＋MBR）处理老龄垃圾渗滤液,考察了邻苯二甲酸二丁酯（DBP）和邻苯二甲酸二（2-乙基己基）酯（DEHP）两种内分泌干扰物在组合工艺中的去除,以及与渗滤液中溶解性有机质（DOM）去除的关系。结果表明,组合工艺对DBP和DEHP的去除率可分别达到92.9%和95.2%,且与DOM腐殖化作用（即腐殖质的芳香性和分子量）密切相关。溶解性有机碳（DOC）主要分布在分子量为1-100 kDa的有机组分中,此时腐殖质的芳香性较强,DBP和DEHP的浓度也较高。经过工艺处理后,该组分的DOC和芳香性有效降低,相应两种污染物的去除效果也更为明显。渗滤液原水及各工艺段中DOC与DBP及DEHP浓度的正相关性,表明二者之间相互作用更有利于污染物的有效去除。

The removal of di-butyl phthalate （DBP） and di-（2-ethylhexyl） phthalate （DEHP） with dissolved organic matter （DOM） was studied in laboratory scale combined biotreatment process for landfill leachate {UASB （Up-flow Anaerobic Sludge Bed） ＋BAF （Biological Aerated Filter） ＋ANO （Anoxic） ＋MBR （Membrane bioreactor）}. The removal rate was up to 92.9% for DBP and 95.2% for DEHP, which was related to humification of DOM, i.e. the aromaticity and molecular weight （MW） of humic substances in landfill leachate. The dissolved organic carbon （DOC） was mostly humic acid （HA） and fulvic acid （FA） in the fraction of 1 to 100 kDa MW, showing strong aromaticity and high DBP/DEHP concentration. With the perfect removal of the fraction, the removal rate of DBP/DEHP was also high. The positive correlation of DOC and DBP/DEHP concentration in raw leachate and in effluents from each reactor showed that the interaction between DOM and DBP/DEHP facilitated the removal of organic pollutants