鉄酸化細菌による鉱山排水処理に関する研究 : (第1報)鉄酸化細菌の増殖と鉄酸化活性について

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Drainage from pyritic mines becomes highly acidic and contains relatively high concentrations of iron, sulfate and hydrogen ions, which are produced as results of either inorganic or orgainc oxydation and of the dressing of pyritic minerals. The acidic mine water enters into streams and lakes, causing a serious water pollution problem.The point in treating such mine water is to remove ion ion as ferric hydoxide from the water. The inorganic oxidation of ferrous iron to ferric ion is very difficult in a low pH range.On the other hand, iron-oxdizing bacteria possess an acidic optimum for the oxidation of iron. We considered that it might be good to use these organisms to dispose the acidic mine water biochemically.A bactchwise test to observe the effects of the initial pH and temperature on the growth and iron oxdation activity of isolates on the 9K medium showed that the optimal occur over the pH range of 2.0 to 3.0 at 30℃. The effect of aeration on the growth of the isolates was distinct, but not so much on the iron oxidation activity. A continuous test at 30℃ revealed that the iron oxidation rate was more than 90% when 40 mg of Fe^<2+> was fed per hour per liter of the react or and that the loading of Fe^<2+> rose up to 77 mg with a reactor containing 0.5% of celite.
社団法人日本生物工学会の論文
1971-01-25