工場廢水の淨化方法に関する研究-V

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  • Studies on Purification of Industrial Waste-V
  • コウジョウ ハイスイ ノ ジョウカ ホウホウ ニ カンスル ケンキュウ 5
  • On the Nature of the Poisonous Substance in Alkali Pulp Waste
  • アルカリパルプ廢液の毒性について

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This paper deals with the estimation of poisonous effect on Scenedesmus obliquus and Carassius auratus due to presence of waste liquors from caustic soda-digests of the knot and the chips ?? and further with searching for the poisonous ingredients of the wastes. Results obtained can be summarized as follows:<br> 1) The inhibition of growth of Scenedesmus due to the waste from the knot-digest was observed until the waste be diluted 100 times. The inhibition effect was as much decreased as abaut one-tenth of the original wase on acidifying the warm waste with hydrochloric acid followed by filtration (Figs.1 and 2).<br> 2) The 24-hr death responses of fish to the wastes from the knot- and the chips-digest were estimated to be at dilutions of 1/800 and 1/90, respectively (Fig. 3). The observation that the fish showed in presence of the wastes a dark coloration and unbalanced state accompanied with an abrupt mad swim, implies that the poisonous substance or subtances will primarily attack the nervous system.<br> 3) The insoluble part obtained by the acid-treatment also showed the poisonous effect to nearly the same extent as the original waste. Most of the poisonous substances in this part could be extracted wish ether. The 24-hr death response to the, ethereal extracts of the liquors from the knot- and the chips-digest were estimaed to be 170 and 340 p. p. m., respectively (Fig. 3).<br> 4) Taking into account the contents in the knot of pitch abietic acid, pinosylvin, and pinosylvin monomethylether, and data for the death response of the fish to these compounds and also to the autoclaved products of th ?? m dissolved in N-N2OH, it will be rnast probable that pitch abietic ?? cid will be one of the principal compounds responsible for hazard of the waste to aquatic organisms (Fig. 4).

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