膜分离腐殖质前后晚期渗滤液可生化性的变化

Variation of biodegradability of mature leachate before and after ultrafiltration membrane separation of humic substances

晚期渗滤液由于含有大量难降解有机物腐殖质,可生化性差,较难处理。采用特定分子量的超滤膜对晚期渗滤液中的腐殖质进行有效的分离,研究了膜分离腐殖质前后渗滤液的可生化性的变化:渗滤液中腐殖质类物质去除率为90.7%,BOD5/COD值提高了6倍,可生物降解的有机物在总有机物中所占比率提高了约4倍。结果表明,分离腐殖质可提高渗滤液的可生化性。

Generally biological treatment of mature landfill leachate gets a low removal of organic matter because of high concentration of refractory organic matter in mature leachate, mainly comprising of humic substances （HS）. HS could be separated from mature leachate by uhrafihration. This study evaluated the biodegradability of the mature leachate before and after separation of HS. The uhrafiltration process led to HS removal levels of 90.7%. The BOD5/COD ratio and the biodegradable organic matter content of HS-separated leachate became 6 and 4 times that of original leachate, respectively. The results showed that separation of HS could effectively improve the biodegradability of mature leachate.