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The purpose of this study was to assess the distribution of organic hydrocarbon substances in case of leachate and effluent from Nakorn Lampang municipality landfill site leak to environment. Leachate and effluent were collected and analyzed their characterizations, compositions and contaminants. Gas chromatography and mass spectrometry technique were used to identify organic hydrocarbon contaminants in leachate and effluent. Then the mathematical model Fugacity-Base Environmental Equilibrium Partitioning Model Level I was applied to the impact of leachate percolation to environment. The results found 36 organic hydrocarbon compounds existed in landfill leachate and effluent. Both of them consisted of 2-hydroxy-1-(hydroxymethyl) ethyl ester, 9-Octadecenoic acid, Cyclopropaneoctanal, 9,17-Octadecadienal, Phenol, Benzene, Oxime, and Phenanthrene as majority substances. Almost these substances were less toxicant and harmfulness. However, high compositions of volatile organic compounds such as benzene and phenol were also detected, indicating hazardous substances contamination in environment can be occur. In case leachate percolation at landfill site, phenol and benzene can be distributed to 8 villages within 5 kilometers around Nakorn Lampang municipality landfill site. The 94% of phenol may distribute to aquatic phase. The concentration of it in aquatic phase may be 5.714 mg/m3 whereas other phases found very rare. Benzene also found in this case and almost of it may be contaminated in atmosphere around 99% by weight with the concentration of 53.5 ng/m3.The leftover may distribute in aquatic phase. The results indicated that the leaking leachate and effluent from the landfill site have a minimal impact on the groundwater resource and others phase of environment.
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