ICETT 四日市公害について知ろう Outline of Japan’s Industrial Pollution Abatement Approaches to Water Pollution Control (Case Study-2) Minamata City, Kumamoto Prefecture (4) Effluent Treatment by Chisso Minamata Plant Table 3-3 Table 3-3 Table 3-3 Changes in Acetaldehyde Manufacturing Process Effluent Treatment