垃圾渗滤液及处理出水的有机物MW分布

Characteristics of Molecular Weight Distribution of Landfill Leachate in Combined Anaerobic-Aerobic Biological Treatment Process

以西安市江村沟生活垃圾卫生填埋场(15年填埋期)的渗滤液为研究对象,采用分子质量切割法测定了渗滤液原水及厌氧—好氧(AO)工艺出水有机物的分子质量分布及变化。结果表明:垃圾渗滤液原水中,78.8%以上的有机污染物分布在分子质量(MW)<10 ku的范围内;厌氧生物处理单元对有机物的去除率达63%,COD的降低主要发生在MW<10 ku的范围内,而后续的好氧工艺对有机物去除率的贡献仅为0.82%。所以在试验水质条件下,垃圾渗滤液经厌氧工艺处理后尚需进行后续处理,但不宜选用好氧生物处理工艺,考虑到有机物分子质量的分布特点,建议采用物理化学法作为后续处理工艺。

A study was made on the characteristics of molecular weight （MW） distribution of landfill leachate during the combined anaerobic -aerobic biological treatment by using molecular weight cutoff test. The leachate was obtained from Xi＇ an Jiangcungou Municipal Waste Sanitary Landfill which has been used for 15 years. The results indicate that the raw leachate contains 78.8% of its organic pollutants in low molecular weight region （MW smaller than 10 ku）. The removal rate for organic pollutants in the section of anaerobic biological treatment is 63%. COD is mainly reduced in the region of MW smaller than 10 ku. On the other hand, the contribution of supplemental aerobic treatment unit for the removal of total COD of raw leachate is only 0.82%. Therefore, based on the certain testing water quality, it needs an additional treatment step after the anaerobic biological treatment, for example physicochemical treatment may be required considering the factor of organic MW distribution.