大阪市内河川水浮遊物質の沈殿と河川底質汚泥の生成 : 大阪市内河川水質と底質汚泥に関する研究(第2報)

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Settling of suspended solids in river water and the formatioin of river mud in Osaka city. FUKUNAGA, I., K. ODA, and G. UNO. (Osaka City Institute of Public Health and Environmental Sciences, Tohjocho 21,Tennoji-ku, Osaka 543) Hokkokogaku 57 : 38-45. 1979. In a 3-year period at average of 60 cm of mud was deposited on the bed of the Dohtonbori river, a typical river in Osaka city. The total volume of suspended solids flowing into Osaka estuary through the city's rivers is estimated to be 200 dry ton/day from the water volume and suspended solid concentration. Soluble matter accounts for 56% of the total BOD of river water; the remaining 44% represents the BOD of suspended solids. The correlation between BOD and suspended solids of river water was found to differ for each of the city's rivers. The suspended solids in river water were found to be principally of large diameter. The settling rate of suspended particles was estimated to be below 0.5 cm/sec by laboratory measurement and theoretical calculation. These results indicate that the suspended solid content of E-type river water should ideally be below 40 ppm.
社団法人日本生物工学会の論文
1979-01-25