Abstract

Abstract

Marsh Furukawa in Rikuzen Takada city, Iwate prefecture, is a considerably polluted marsh that is caused by organically polluted bottom sediments. With the prime objectives to improve the quality of the bottom sediments and water, several experiments were carried out by using bio-reactors. At first dredged polluted muddy water was treated by the bio-reactors, and subsequently polluted substances were decomposed and oxidized. it was succeeded in reduction of polluted substances and removing rot odor from the bottom sediments therefore. it was facilitated subsequent treatment. Possibilities are found in the restoration of self purification functions of the marsh, it is, recovery of ecosystem. After spill water treated, it was discharged to marsh Furukawa. From the results of the series of experiments, it was found that the principle subject for purification works could be carry out practically, I.e. obtaining disposal sites for the dredged bottom sediments. Following to these experiments, larger scale of the demonstration tests were conducted to improved the polluted bottom sediments.