工場廃水に関する研究（第２報）

Here we report the several results obtained after we wrote previously. (1) About biological study. (i) The relation between minimum active dose of fish and nervous system was observed, removing the olfactory or optical organ of fish. H₂SO₄ or NaOH solution shows no relation to both senses, NH₃ solution have a little influence to the olfactory sense, and sulfite pulp sewage gives great influence to the olfactory sense and a little to the optical one. (ii) Unpleasant dose of the sulfite pulp sewage are one fourth of its minimum active dose. (iii) The high concentration (COD.100 mg/I) of the sewage of sulfite pulp industry seems to repress the growth of Senedesmus population. (2) About sedimentary organic substances. To explain the unpleasant condition of mud, we used the mud in which some organic substances were mixed, and observed the growth of sulfate reducing bacteria. Under dead water condition; the mud; mixed with 2/300 volume pulp sediments, produced 3 mg/g sulfide after 20 days. Under running water condition, sulfide began to be produced after 10 days, and the sulfate reduction are found to continue even after 128 days. (3) Some examples of sewage dispersion. (i ) Layon industry waste water in Kuba Bay. The range of the sewage despersion could be successfully traced by means of COD method, showing wide area under low tide and narrow during high tide. (ii) Pulp industry sewage of Ono. Visibly coloured range of dispersion of this sewage was nearly the same to that of more than 10 mg COD value, having a halfcircular area of abot 200m radius. (iii) Dispersion of sewage which flowed out from flood gate. (a) Pulp sewage of Otake. Sewage began to flow 2.5 hours after up tide. At first it flowed west-ward according to ebb current, and then east-ward with rising one. Area of concentration of above 50 mg COD was observed unchanged during the water gate open. (b ) Sewage of city near Oko. During up-tide, the sewage is floating only within the harbour. Then it flowed out according to ebbing current, and at it's maximum the dispersion area shows semicircular shape of 1,200 - 1,300 m. With biginning of up tide it is compressed gradually into the harbour. (iv) Dispersion of sewage in river. Two rivers are branched from Ota-river at the point of 5 km up the mouth. A pulp industrial sewage flows out a little down one of them. But because this one dry up at low tide, the sewage flows into other rivers. However we find no remarkable influence at each mouth. (v) Sewage of city in a inlet. Length of this inlet is about 3 km, and at its innerest point the sewage of city has its sewer mouth. The influence of the sewage was observed about 500 m far out of the mouth of inlet. But at the maximum of ebbing tide it reachs almost about 1500 m. The bottom mud suffers from the influence in nearly the same range of sewage. No living benthic organismus can be found in inner part of the inlet. (4) About the sewage of city. (i) Study on the analytical methods of sewage. To study the character of organic matter in sewage the oxygen demanding power was examined by treating the sample under various conditions. (Tab. 1, pp. 73) Along the course of sewer, the oxygen demanding powers are observed to be gradually changed. (ii) At 2 km up from the mouth of sewer there are a gas and a seasoning factories and their sewages take about 7-8 hours to flow down the sewer. While flowing down, the sewage are diluted and total organic matter decreases, but H₂S content shows some increase, and DO disappears on the half way. At the same time COD (50°C, 5 min) increases but COD (50°C, 60 min) decreases. (5) About the sewage of starch industry. If the sewage of starch industry flows down into a region of rapid renewal, a little volume of sewage of this industry and good dilution limit its influence only within a narrow area. But in stagnant region, the reducing fermentation oceurs and the sewage, soaking into beach mud, may produce hydrogen sulfide. (6) Some investigations on fishing damages. (i) . Abnormal death of Cardium muticum near Oze river. After a violent typhoon in 1951, there died a great many Cardium muticum on the fishing ground near Oze river. A large amount of deposit was observed around the river mouth and has an unusual high value of COD, to which the distribution of mortality was found proportional. In 1953, COD of the mud became normal and Cardium muticum began to be fished again. (ii) Abnormal death of Asari (Venerupis philippinarum) at Kogo. During a long rain, July 1953, Asari showed an abnormal death rate on a shallow near Kogo. It was concluded that the too low salinity, continued during neap tide would be the reason of this high mortality. (iii) Abnormal death of Oyster at Ono. Oyster cultivating fields are situated near the outer range of sea surface having above 10mg/L COD under the effect of a pulp industrial sewage. Since the nearer the oyster bed to sewage region exists, the higher the mortality observed, it was concluded that the influence of the sewage seems to be in some relation with it's abnormal death. (7) Investigation of damages of fishing. The investigation is now going on by means of the method to let the fishermen note precisely the daily catch and the situation of the fishing grounds around the possible range of influence by industrial sewage. Successful analysis of such a problem is expected by this method.

言語

書誌情報

ja : 内海区水産研究所研究報告
en : Bulletin of Naikai Regional Fisheries Research Laboratory

巻 6, p. 59-104, ページ数 46, 発行日 1954-10

出版者

内海区水産研究所

言語

出版者

Naikai Regional Fisheries Research Laboratory

言語

ISSN

収録物識別子タイプ

PISSN

収録物識別子

0497-5022

書誌レコードID

収録物識別子タイプ

NCID

収録物識別子

AN00176718

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識別子タイプ

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