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The objective of this study is an attempt to conduct an environmentalmonitoring and impact assessment of the On-Nooch solid waste disposal sitein Bangkok, Thailand. Four water and five air sampling stations (2 upwindand 3 downwind directions) were established at the site. Grab water samplesfrom leachate treatment plant and Khlong Song Hong, a nearby stream, werecollected during the rainy and dry seasons. Analytical results of the wastewater discharged by the leachate treatment plant, during dry season showedchemical oxygen demand: 618 mg/l; biochemical oxygen demand: 80 mg/l;suspended solid: 101 mg/l; Total Kjeldahl Nitrogen: 283 mg/l, which werestill higher than standard limit for effluents in Thailand. During the dryseason, results also showed widespread heavy metal pollution from leachate(chromium: 1.03 mg/l; manganese: 1.07 mg/l; mercury: 0.025 mg/l) and werehigher than the allowable level of heavy metals for the Industrial EffluentStandard in Thailand. The direct discharge of untreated leachate into inlandwater will cause considerable water pollution in the study area. Compositeair samples in this study area were collected during the rainy and dryseasons and were analyzed for methane (CH4), carbon dioxide(CO2), carbon monoxide (CO), sulphur dioxide(SO2), nitrogen dioxide (NO2) andsuspended particulate matter (SPM). The average concentration of SPM rangedbetween 0.1–0.36 mg/m3 for 24-hour average, dependingupon the season. The level of CH4 and CO2 inthe ambient air of the study area were found to be 3.48–65.71mg/m3 and 886-1758 mg/m3 respectively which weremuch higher than the normal concentration of CH4 andCO2 in the air (CH4: 2.41 mg/m3;CO2: 585 mg/m3). Hence, adverse health andenvironmental effects could be expected from water and air pollution.
Environmental Monitoring and Assessment – Springer Journals
Published: Sep 21, 2004
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