REMOVAL AND DISPOSAL OF ACCUMULATED ORGANIC SLUDGE IN THE PORT AND HARBOUR AREA OF OSAKA PORT (JAPAN)

With a population of about 15 million, the quantities of water-polluting material discharged into the waterways around Osaka City (Japan) has been a major problem. Since 1974, therefore, the Port and Harbour Bureau of Osaka has been dredging sludge from the rivers and estuaries in polluted areas of the bay as part of the port and harbour pollution control project. The dredging was carried out using pneumatic pump dredge and closed type grab dredge which causes less disturbance of the mud to avoid further pollution of the water.