河川底質汚泥の再溶解による表流水の汚濁

概要

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The average concentration of sulfide, Cd, Pd, Fe, V.S., COD_<Cr>, T-N, T-PO_4 were 5,200 ppm, 6.1 ppm, 82.9 ppm, 7,200 ppm, 12.5%, 197,000 ppm, 3,300 ppm, 19,000 ppm respectively in river mud of Osaka City. The coefficient of variance (C.V.) was 40-128% and the sulfide was closely related to iron and lead. Ferrous sulfide and river mud are leached away only a little in river water at rest, and are leached away more easily under anaerobic conditions than under aerobic conditions.Though some heavy metals were detected that are leached from river mud by aeration in the filtrate through 0.45 μm pore size filter, most of the heavy metals remain in suspended solid. Level of leaching of nitrogen and phosphorus does not vary so much with aeration time. River mud disintegrates little even on long time aeration.In river water it is important for prevention of mud leaching to keep the river aerobic. And for public health the leaching of nitrogen and phosphorus are more important than that of heavy metals.
社団法人日本生物工学会の論文
1975-09-25