COD_(CH_4)/COD值评价垃圾渗滤液厌氧可生化性的研究  

Appraising Anaerobic Biodegradability of Landfill Leachate by COD_(CH_4)/COD

作　　者：张胜利[1] 刘丹[1] 王艳捷[2] 邱忠平[2] 

机构地区：[1]西南交通大学环境科学与工程学院 [2]西南交通大学生命科学与工程学院,四川成都610031

出　　处：《环境科学与技术》2011年第8期134-138,共5页Environmental Science & Technology

基　　金：西南交通大学青年教师科研起步项目资助(2009Q027);绿色交通工程及其关键技术的研究(SWJTU09ZT26)

摘　　要：基于理论分析,提出CODCH4/COD值作为废水厌氧可生化性的评价指标,确定了CODCH4/COD值表示厌氧可生化性的数值界限。同时,在BMP分析的基础上,采用CODCH4/COD值考察了垃圾渗滤液的厌氧可生化性,并与BOD5/COD值评价结果进行了对比。实验结果显示,CODCH4/COD值与BOD5/COD值用于垃圾渗滤液可生化性的评价,得出的结论具有相似性,但CODCH4/COD值大于BOD5/COD值。究其原因:好氧条件下,总的生化耗氧量(BOD)u小于理论完全需氧量(COD);厌氧条件下,有机物完全去除时CODCH4(理)等于理论完全需氧量。此外,BOD5测试时间仅5 d,而BMP测试时间一般在30 d以上,从而使微生物有足够的时间去适应废水水质,故能较好地反映废水的可生化性。On the basis of theoretical analysis,CODch4 /COD as wastewater anaerobic biodegradability index was presented,and the bound of numerical value was determined.At the same time,leachate of a landfill in Chengdu was collected as a subject of case study.Anaerobic biodegradability of the landfill leachate was appraised by CODCHch4/COD through biochemical methane potential（BMP） test.Results evaluated respectively by CODCHch4/COD and BOD5 /COD were compared.It was found that a similar conclusion was obtained for the anaerobic biodegradability index,but CODCHch4/COD was greater than BOD5 /COD for the same sample.The possible explanation was that total biochemical oxygen demand（BODu） was smaller than total COD in aerobic condition,and with organic pollutants converted completely into methane CODCHch4 was equal to COD in anaerobic condition.The test time was only 5 d for BOD5 and above 30 d for BMP where microbial flora had enough time to adapt to wastewater.Thus CODCHch4/COD was feasible for the biodegradability evaluation of wastewater such as landfill leachate.

关 键 词：垃圾渗滤液 可生化性 CODCH4/COD BOD5/COD BMP 

分 类 号：X705[环境科学与工程—环境工程]