Survey of Damai Landfill site in Vietnam and Proposal for Improving Decrease of Organic Compounds

In order to re-estimate and improve the decrease of organic compounds, the more detailed surveys in Damai landfill site located in a mountain area in Vietnam and some experiments using the leachate from this site were conducted. Afterward, a plan for improving the decrease of organic compounds in Damai site was proposed and O3/H2O2 was also conducted as an alternative method of fenton treatment. The obvious variations in water quality parameters were observed in all raw lechates. Regardless of the variations , BODs and COD were generally high in the raw leachate, showing the long-term outflow of organic compounds , and the ratio of BOD5 to COD were high of 0.17 ~0.32. The discharge criteria in Vietnam were met in the final discharged water. The extension of HRT from 20 to 40 h caused a higher extent of BOD5 removal, but no obvious effect on the removals of COD and color. The change of weight ratio of Fe to H2 O2 (O) from 2.3 to 3.4 caused a slight increase in the removal of BOD5 and COD, but no detectable difference in the removal of color. O3 /H2 O2 brought an obvious increase in the removal of color, and the adjustment of reaction time was an important factor. The treatment system containing O3 /H2 O2 will be an alternative method in Damai site.