硫酸塩法製紙工場の廃水による水質汚漬

概要

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River water polluted by the wastes of two sulphate paper mills-the one T. Mill situated on the River Sin and the other 0. Mill on the River Syonai-was examined chemically and biologically. In the case of T. Mill, the harmful effect of the waste on the fishery in the Sin was considerable, but in the case of O. Mill, it was not so much, because the Syonai gets enough affluent water to dilute the waste. Yet in the latter, we could clearly recognize differences of chemical properties of the river water before and after the mill came into operation. According to our examination the pollution by the sulphate paper mill waste may be detrimental to fish life in foilowing ways ; (1) by depleting the dissolved oxygen and suffocating fish, (2) by direct poisoning or killing of fish by toxic substances. The polluted river water brought forth a very bad taste and odour to the fish in the large area and made them of no use for human food. This ill-effect was the most serious, among others, for fishery. To get rid of those ill-effects, we consider that sedimentation and filtration of sulphate soap and other suspending matters, and oxidizing of the waste may be effective.
公益社団法人日本水産学会の論文