亜鉛含有量の異なる活性汚泥を施用した土壌-植物系における重金属の挙動

概要

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The contribution of Zn in activated sludge applied to Andosol as a fertilizer to increased Zn concentrations of plants grown in the soil was estimated. At the same time, the effect of added Zn on Cu and Mn concentrations in the plants and soil was examined. We prepared three types of activated sludge with different levels of Zn concentration taken from municipal wastewater with an elevated Zn concentration. The application of the activated sludge to the soil increased the AB-DTPA soluble fraction of soil Zn and the Zn concentration of plants (Brassica rapa L. var. pervidis Bailey) grown on the amended soil in a greenhouse. The increase in plant Zn concentration and the amount of soluble Zn in the amended soil correlated closely. This indicates that Zn in the activated sludge was easily takn up by plants and also that plants absorbed Zn mainly from the sludge. Zn concentrations in plants decreased as the incubation period of the soil before sowing was extended. This suggests that Zn in the sludge was transformed into a form less available to plants, although it was still AB-DTPA soluble, by decomposition of the activated sludge. The higher concentration of Zn in the sludge did not affect the concentration of Cu and Mn in the soluble fraction from the soil and in the plants.
社団法人日本土壌肥料学会の論文
1996-06-05