When the Edogawa mill of Honshu Paper Mfg Co. constructed SCP plant, the trouble of pollution occured.
Therefore the effect of waste liquor on the aquatic life was investigated.
“ Tolerance Limit-48hr ” or “ Effective Dose 50 %” was measured, using several degrees of concentration of waste liquor, diluted with fresh or sea-water.
Aquatic life was, -
(1) carp, killifish, gold-fish, scenedesmus.
(2) Zoea lavae, tapes philippinarum, goby, green laver, etc.
The result was as follows : -
(1) Safety limit (TLm-48hr) × 0.1 (Aquatic Life Advisory Committee 1955) was × 6, 000 dilution ratio of SCP waste liquor.
(2) Waste liquor, completely spread in the flow of the “ Edogawa ” river, was at least × 33, 000 degrees of dilution.
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