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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
Environment Research Association.(RERA:Japan)
We have developed the new process for the improvement of the contaminated sediments. The new process is based on controlled succession of micro-biota with a bioreactor.
The test results were that 1) the volume of dry solids was reduced by roughly 1%/d, 2) made odorless, 3) the number of coliform groups was reduced to less than 1/100, 4) the reduced iron in the sediment was oxidized and a large volume of contaminated sediment converted into sediment containing oxygen, 5) in release tests conducted over a period of 20 days, the nitrogen regeneration volume was reduced by 90% and the phosphorus regeneration volume by 95%, 6) and effluent quality was improved by advanced treatment.
This makes the treatment of contaminated sediments easier, and when securing a disposal site is difficult, the regeneration of nitrogen and phosphorus is suppressed even if the treated sediments was returned into lakes, marshes and the sea. Also, a large volume of oxygen can be supplied into the bottom layer to eliminate anoxyc water, oxygen can be retained in the bottom layer over a long period of time to prevent deterioration of the water environment, and recovery of poor water environments appears possible.
Batch treatment; Bioreacter; Contaminated bottom sediments; Release test; Dam; Wetland; Regeneration; Succession of micro-biota;