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Title: メタンを指標とした不法投棄物・埋立廃棄物の掘削現場における有害ガス簡便モニタリング手法の検討
Other Titles: Study on a Convenient Method for Monitoring Hazardous Gas Based on Methane Determination during Waste Excavation at Reclamation Sites
Authors: 谷川, 昇1 Browse this author →KAKEN DB
古市, 徹2 Browse this author →KAKEN DB
石井, 一英3 Browse this author →KAKEN DB
岩崎, 謙二4 Browse this author
Authors(alt): Tanikawa, Noboru1
Furuichi, Toru2
Ishii, Kazuei3
Iwasaki, Kenji4
Keywords: メタン
open path analyzer
landfill site
hazardous gas
hydrogen sulfide
Issue Date: 2010
Publisher: 廃棄物資源循環学会
Journal Title: 廃棄物資源循環学会論文誌
Journal Title(alt): Journal of the Japan Society of Material Cycles and Waste Management
Volume: 21
Issue: 1
Start Page: 1
End Page: 9
Publisher DOI: 10.3985/jjsmcwm.21.1
Abstract: 不法投棄物や最終処分場の埋立廃棄物の掘削現場において,ハンディタイプオープンパス型メタン自動計測器によって連続計測したppmレベルの大気中メタン濃度を指標とする作業環境の有害ガス簡便モニタリング手法を提案し,掘削現場への適用可能性を検討した。不法投棄現場や最終処分場から発生するガス中の有害ガスはメタンと共存すること,有害ガスとして注目されるのは硫化水素である場合が多いこと,硫化水素のメタンに対する濃度比の最大値は10^[-1]程度であることを示し,大気中メタン濃度が発生ガス中の有害ガスの潜在的な危険性を安全側で評価する指標になることを明らかにした。また,掘削現場での影響が懸念される硫化水素等の有害ガスの許容濃度,有害ガスのメタンに対する濃度比の最大値および安全率を考慮して設定したメタン濃度の管理値を計測値と比較する提案手法が,掘削現場の安全管理のためのモニタリングに適用できることを示した。
We propose a convenient method for monitoring hazardous gas based on the determination of ppm-level concentrations of CH4 in ambient air. The proposed method can be applied during the 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 retroreflector 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 considered to be the main hazardous component. The maximum concentration ratio (H2S/CH4) at final disposal and illegal-dumping sites was expected to be about 10^[-1]. This study showed clearly that the ambient CH4 concentration could be useful as an indicator for the monitoring of hazardous gas for the evaluation of potential danger. It was also shown that the proposed method could be useful for monitoring as a safety control at a reclamation site. This method works by comparing the measured ppm concentration levels of CH4 with a management value that is decided by considering the maximum concentration ratio (of the hazardous gas that was most harmful at the site, such as H2S/CH4), its acceptable concentration and a safety ratio.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 古市 徹

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