Proposal of convenient monitoring method for hazardous gases based on methane during wastes excavation in reclamation sites.

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  • 不法投棄廃棄物等掘削現場におけるメタンを指標とした有害ガス簡便モニタリング手法の提案
  • フホウ トウキ ハイキブツ トウ クッサク ゲンバ ニ オケル メタン オ シヒョウ ト シタ ユウガイ ガス カンベン モニタリング シュホウ ノ テイアン

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Abstract

We propose a convenient method for monitoring hazardous gas based on determination of ppm-level concentrations of CH4 in ambient air. The proposed method can be applied during excavation of landfill or dumped waste at reclamation sites, and we investigated its usability in an actual field. A portable open-path type analyzer and a retro reflector were used to determine the CH4 concentration. The hazardous gas in landfill gas emitted from final disposal and illegal-dumping sites always contains CH4 and H2S occurring together, with the latter being considered as the main hazardous component. The maximum concentration ratio (H2S/CH4) at final disposal and illegal-dumping sites was expected to be about 10^-1. It was shown clearly that the CH4 concentration in the ambient could be useful as an indicator for the monitoring of hazardous gas for evaluation of potential danger. It was also shown that the proposed method could be useful as a monitor for a safety control at a reclamation site. The method works by comparing the measured ppm concentration levels of CH4 with a value that was decided by management after considering the maximum concentration ration (hazardous gas, which was most harmful at the site such as H2S/CH4),its acceptable concentration, and safety ratio.

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