9/15/2023 0 Comments Methylmercury report dredgingFurthermore, conversion of the production method was advised against caustic soda plants that might discharge mercury other than Chisso and Showa Denko plants. In 1970, the Water Pollution Control Law was enacted, which enforced control of discharge of effluent in all water areas in Japan, in relation to toxic substances, for example, mercury and cadmium. In 1969, drainage of the factory effluent containing methylmercury to Minamata Bay was regutated. In the Agano River basin the process of producing acetaldehyde had already closed before Minamata Disease was discovered. With regard to the Minamata plant of Chisso Co., Ltd., through the completion of the perfect circulation system in 1966, water effluent containing methylmercury compound had not been discharged outside of the plant in principle, and the pollutant source was eliminated through cessation of the production of acetaldehyde in 1968. (1)Measures against environmental pollution Closing down of the pollutant sources As we will describe below, many measures have been taken up to now against Minamata Disease.
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