Removal of chromium (VI) by semi Launcher-type wells

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  • 擬似ランチャーによる六価クロム除去
  • ギジ ランチャー ニ ヨル 6カ クロム ジョキョ

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Abstract

“A Launcher -type” well which has t wo ports vertically or horizontally is proposed. It has a port for recharge of washing water against contaminated area at the upper part of the well or either side of it. Another port for withdrawal of contaminated water is located at the lower part or the other side. A launcher-type well can wash out contaminant in the vadose zone and saturated zone water. In this paper, the well for recharge is dug closely to a well for pumping up (withdrawal) at a shallow layer of underground in contamination area of chromium (VI) and the experiments for practical functions of “semi Launcher-type wells” which substitutes for Launcher-type wells have been conducted by these two wells that were dug in accordance with the field on the basis of a series of the indoor models.<BR>Although the wells could not beset closely to the hot spot, experiments showed the effect of washing out residual chromium (VI) in the vadose zone at the beginning of recharge. Therefore, if these wells are constructed at the exact site of contaminant, performance of washing the contaminated underground is to be significant.<BR>In addition, a water flood method is experimented by rech a rge from the upstream well combined with the downstream well for withdrawal. This method might be included in “flushing” was experimented on purpose to wash out of contaminant in the wide area by recharged water from the well that was dug in the upstream of hot spot. Its effect was confirmed by this experiment.<BR>On the whole, about 1.8kg of chromitim (VI) was collected during six months in this experiments which are composed of pumping, semi launcher wells and water flood operations.<BR>Although the grasp of long-term decrease of the concentration and the material balance were not shown, the result in this paper shows one step advance in practical use of the series of launcher-type devices that have been initiated with indoor experiments.<BR>A foundation of semi launcher type wells was obtained for the development of more effective remediation method in-situ against the contamination throughout the underground. Then it would be useful to establish a numerical analysis in three dimensions in the next step.

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