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NEW PROCESS FOR
IMPROVEMENT OF
CONTAMINATED
SEDIMENTS
BY SUCCESSION
OF MICRO-BIOTA

2nd
INTERNATIONAL
CONFERENCE on
COTAMINATED
SEDIMENTS.
Rotterdam
Netherlands.
September 7-11
1997

INTRODUCTION.

In lakes, marshes and sea areas, harmful sediments(sapropel) are produced by the inflow of contaminants. These harmful sediments consume oxygen and change the ecosystem, resulting in the regeneration of nitrogen and phosphorous from the bottom sediments and leading to the worsening of water quality. Particularly, contaminated organic sediments have a high fluidity and a putrid smell, making their elimination and treatment difficult. The objective of the new process described herein is to improve these contaminated organic sediments through the controlled succession of micro-biota.

The succession speed of micro-biota is very fast in general. By performing succession treatment of contaminated organic sediments in a short period of time by artificial operation, it is possible to transplant the self-purifying function of activated sludge into sediments. At the same time, it is possible to oxidize iron, which is an oxidation-reduction substance contained in the sediments, thus improving the contaminated organic sediments into sediments possessing a large amount of oxygen and a self-purifying function.

This report discusses the results of practical tests using a pilot plant that were carried out in Marsh Furukawa (brackish lake; water area: 9ha.; volume: 159.000m3; mean water-level: 1.77m) in the winter of 1992 to verify the process for improvement of contaminated sediments by succession of micro-biota.

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