![]() It was carried out using a horizontal auger suction dredger. ![]() Remediation of the contaminated sediments took place during 19. The content of PCB in the sediments of Jaernsjoen was estimated at about 400 kg and was the most important source for spreading of PCB in River Emaan. Lake Jaernsjoen is a small lake in the Emaan river system which is considered to be one of the most valuable watercourses in Sweden. Dredged material was discharged into the reclamation area, filled up to sea level, and covered with a sandproof membrane, lightweight volcanic ash earth, and mountain = , Dredging work was successfully carried out by using four cutterless suction dredgers, newly developed in advance for minimizing resuspension of sediments. Before sediment disposal, boundary nets were installed to enclose the work area to prevent the mixing of contaminated and noncontaminated fish. The basic approach to sediment disposal was to construct a highly watertight revetment to reclaim the inner area of the bay and then confine sediment dredged from the remaining contaminated area in the reclamation area through surface treatment. To eradicate Minamata Disease, caused by the discharge of sewage containing methyl mercury and its accumulation in fish and shellfish through the food cycle, a large-scale sediment disposal project was conducted with special care taken to prevent new pollution resulting from the project itself. ![]()
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