NEW METHOD DEWATERS DREDGED MATERIAL, CUTS LAGOONING SPACE

An economical and environmentally safe way to dispose of dredged materials (stored in diked logoons) is described which may reduce dredge slurry volumes by a factor of 10. The procedure consists of dewatering and compacting a layer of dredged material, addition of more watery dredged material followed by compacting. Since the compacted material has high strength, there would be no need for high containment dikes or concern for dike stability. The soupy dredged material is put into a diked area and allowed to settle for a day. The layer of clear water that forms on top is decanted. The resulting dredged material slurry is periodically stirred with bulldozers to accelerate the evaporation of water. Next, the material is compacted. Details are given of the demonstration of this new technique in Michigan. It is noted that use of a compacted clay base would prevent deterioration when using the bulldozer. While tracked vehicles appear suitable for conditioning dredged material placed on fine grained foundation materials, they are not suitable for operation on sandy materials (the use of rubber tired vehicles is advocated). Comments are made on the use of special equipment, the quality of the decanted water, and the rate of evaporation. The use of the technique for dewatering other material (the tailings from the phosphate-mining industry, bauxite tailings from aluminum industry etc.) is discussed.

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Filing Info

  • Accession Number: 00097163
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 5 1975 12:00AM