Journal of The School of Marine Science and Technology,Vol.3 No.1
An Experimental Study on Leaching Characteristics from Dredged Sediments
Tomohiro INOUE, Masaharu FUKUE, Koji UEHARA and Kazuo OKI
Abstract
Use of dredged sediments is one of the important subjects for marine environmental problem. This study
proposes to use dredged organic sediments as fertilizer and manure in the sea. To examine quality of dredged
sediments,leaching tests were performed using the Orido bay sediments and artificial seawater.The sediments were
dried or burned at various temperatures (Natural, 60, 110, 300, 800and 1000゜C), before the leaching tests. The pH
value of artificial seawater used was adjusted 8.05with buffer solution of 10%-NH4Cl. The experimental results
showed that the redox potential of sediments increased with temperature used. The nutrients and heavy metals
contained in the sediments were leached,depending on the temperature used.It was found that there was an optimum
temperature for the maximum amount of leachate.