Abstract
River pollution as public nuisance is a very serious problem today. There are many factories along the Sumida River and the Shinkashi River, in Tokyo, which flows into the upper stream of the former. The Sumida River is especially contaminated by chemical factories, which discharge highly polluted wastes. Among these factories are dye- and pigment-factories, which discharge wastes containing dye or pigment itself and dyestuff intermediates.
The aromatic amines in the water at certain places along the Sumida River were investigated, and it was found that it contained 0.205-0.562 ppm of aromatic amines in the water, such as carcinogenic amines, benzidine, dichlorbenzidine, α-naphthylamine and β-naphthylamine.
From the result of this investigation, it has been considered that pre-treatment plants for purifying wastes should be installed quickly.
