Rehabilitation of Estuaries in Takamatsu Harbor,
JAPAN SEDIMENTS MANAGEMENT ASSOCIATION TOKYO
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The objectives of this project were to recover the natural environment of Senbagawa District around Takamatsu Harbor and to prevent possible marine contamination by dredging the organic sediment containing polychlorinated biphenyls PCBs precipitated in the estuaries of the Senbagawa River. Based on the results of a sediment survey, dredging was recommended for sediment with 10 ppm PCB content and an-ignition loss of 20 percent or above. This involved a quantity of 82,000 cub. m, covering an area of approximately 47,000 sq. m. The related tasks dredging, transporting, unloading, dredged material solidification, disposal, and covering are described. Reference values established for the treated and discharged spillwater were pH, 5.8 to 8.6 suspended solids, 10 ppm or below and PCB content, 3 ppb or below.
- Civil Engineering
- Water Pollution and Control
- Solid Wastes and Pollution and Control