Effect of type of treatment and disposal of plastic wastes on micropollutants in leachates from solid waste disposal sites

测定了垃圾填埋场渗滤液中双酚A(BEA)的含量。工业垃圾渗滤液中双酚A的含量范围为ND~2,800μg/L，市政垃圾渗滤液中的双酚A含量为26μg/L~8,400μg/L。对于富灰场，双酚A浓度随着时间的推移而增加，而对于有机质丰富的场地，双酚A的浓度随着时间的推移而降低。在日本进行的一项为期七年的调查显示，在正在进行的填海工程中，双酚A的浓度既没有减少也没有增加的趋势。菲律宾一个地点的渗滤液含有高浓度的双酚A。BPA浓度与TOC呈轻微正相关。渗滤液中的大部分双酚A存在于溶解和有机非缔合组分中，不能通过混凝沉淀。采用生物处理、混凝、沉淀、砂滤、活性碳吸附等一系列常规处理工艺，可去除原渗滤液中99.9%以上的双酚A。在一般水质参数方面，菲律宾某地点的渗滤液化学成分与日本焚化残渣含量低的地点的渗滤液的化学成分相似。在这种类型的渗滤液中观察到相对较高的铅和锑浓度以及非常高的锡浓度。

Concentrations of bisphenol A (BEA) contained in landfill leachates from solid waste disposal sites were measured. The concentrations of BPA contained in leachates from industrial waste sites were in a range of ND to 2,800μg/L, while those from municipal sites were in a range of 26 μg/L to 8,400μg/L. The leachates from ash-rich sites contained relatively lower concentrations of BPA compared with organic-rich leachates. It is suggested that BPA concentration increases with time after the completion of reclamation in the case of ash-rich sites, whereas the concentration of BPA decreases with time in the case of organic-rich sites. A seven-years survey on a site in Japan showed neither a decrease nor an increase tendency in the concentration of BPA during ongoing reclamation. A leachate from a site in the Philippines contained high concentrations of BPA. A slight positive correlation was found between BPA concentrations and TOC. A major portion of BPA in leachates was found in dissolved and organic unassociated fractions, which cannot be precipitated by coagulation. More than 99.9% of BPA contained in the raw leachates was removed by the conventional series of treatment processes consisting of biological treatment, coagulation, sedimentation, sand filtration and activated carbon adsorption. The chemical compositions of the leachates from a site in the Philippines and that from a site with a low content of incineration residuals in Japan were similar in terms of general water quality parameters. Relatively high concentrations of lead and antimony and very high concentrations of tin were observed in this type of leachates.