DUMPSITE TOXICITY ASSESSMENT AND POTENTIAL FOR REHABILITATION : A CASE STUDY AT MAUNG PATHUM DUMPSITE, THAILAND

摘要

The condition of Maung Pathum dumpsite in Pathumthani province, Thailand was investigated for potential rehabilitation and material recovery. Analysis of solid wastes and leachate samples from the dumpsite showed that the waste is stabilized, mainly consisting of soil fraction (69-75%). The result of toxicity characteristics leaching procedure (TCLP) revealed that the soil fraction was not hazardous and potential to be reused as landfill cover material. Moreover, soil fractions of particle size < 10mm and < 2mm have potential to be used as compost material after supplementing P and K. However, the leachate quality does not comply with the criteria of a typical stabilized landfill and the heavy metals concentration is higher than the Thai Effluent Standard. This may be due to the infiltration of young leachate from the newly dumped waste at the top of the pile. The calorific values of waste samples indicate that except for wet organic materials it can be reused as refuse derived fuel (RDF).