Bioventingによる土壌中の汚染物質除去に関する一実験

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  • Experiments of Bioventing for Soil Pollutant Removal
  • Bioventing ニ ヨル ドジョウ チュウ ノ オセン ブッシツ ジョキョ ニ カンスル イチ ジッケン

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Bioventing, a popular method of vadose-zone remediation, is the technology where air or O2 gas is put into the site contaminated by volatile organic compound (VOC), activates indigenous microorganisms, and promotes biodegradation. Various reports about bioventing applied to sand or sandy soil have been published, while few reports on bioventing were published for silty and clayey soils. The object of this study is to reveal the ability of pollutant removal in Japanese volcanic ash soil whose texture is silt loam. Pollutant removal ratios, total germ numbers and changes of O2 and CO2 concentrations were measured through batch test, and distributions of pollutant removal ratios and total germ numbers through column experiment.<BR>There were almost the same microorganisms per lg dry soil in the samples of volcanic ash soil as in those of sand, pollutant removal ratios in volcanic ash soil was lower than those in sand because of the activity of microorganisms that we could know from the changes of O2 and CO2 concentrations. In the column experiment, more pollutant was removed at the inlet for air than at the outlet

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