活性汚泥の水銀除去機構の検討 : 活性汚泥による水銀含有廃水の処理(第1報)

概要

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For the purpose of treatment of waste water containing mercurials, the mechanism of elimination was studied. Semicontinuous treatment of waste water containing mercuric chloride by acclimated sludge was satisfactory, and mercury removal rates were over 99.8% in all cases. By measurement of volatilized mercury, ti was found that mercury was removed by volatilization. Using sludge acclimated to low concentrations of mercuric chloride (below 15 ppm), mercury concentration in the solution decreased rapidly after addition of mercuric chloride. Volatilization of mercury was almost complete within several hours, but at this time 1-3% (per dry sludge weight) of mercury remained in the sludge. This mercury was volatilized only by further addition of mercuric chloride. From an isotope study using^<203>Hg, it was assumed that this phenomenon might take place by exchange of the mercury in the sludge with the newly added mercury. Sludge acclimated to 30 ppm of mercuric chloride showed a different pattern of mercury volatilization from other sludges, because this sludge contained plenty of metallic mercury.In activated sludge treatment, what should be used as the index of activity is an important problem which must be solved. It was assumed that in the treatment of the waste water containing mercurials, the use of mercury volatilization rate as the index of activity was appropriate.
社団法人日本生物工学会の論文
1974-11-25