Microbiological Aspects of Pollution Control by R. Dart (Eds.)

By R. Dart (Eds.)

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149(1976)251. p. witter and E. Balish, Appl. Environ. , 38(1979)861. E. Eriksson, J. Geophys. , 68(1963)4001. J. Marchesani, T. C. Wohlers, J. Air Pollut. Contr. , 20(1970)19. C. L. Jensen, Science, 177(1972)1099. L. M. , 6(1972)711. R. W. P. Hollis, Science, 149(1965)524. P. Seuren, Tiidochr. , 104(1979)383. M. Alexander, Adv. Appl. , 18(1975)1. R. L. Shreir (Editor) Corrosion Handbook, Vol. 51. A. Miller, Microbial Aspects of Metallurgy, Medical and Technical Publn. , 1971. R. Postgate, The Sulphate-Reducing Bacteria, Cambridge University Press, Cambridge, 1979, 106.

The earliest study of the airborne spread of bacteria from wastewater was carried out by Horrocks [81]. He showed that when wastewater flowing in sewers was seeded with Bacillus prodigiosus, this organism could be recovered on agar settling plates placed in branched ventilation risers 15 m above the flowing wastewater. This was so, even if the particular branch risers were upstream from the flow of seeded wastewater. The organism was not recovered on control plates, or from any branches which were separated from the seeded wastewater by running traps.

The total number of bacteria were up to 144 viable particles/cu. ft. at the edge of one filter and 80 viable particles/cu. ft. 2 m downwind. 46 There was no Ε. coli or K. aerogenes in the upwind controls, but in 4 out of 18 samples the upwind control had counts equal to, or higher than, the downwind recoveries. In this work, the relative humidity, air temperature, wind direction and speed were all recorded. No correlation could be shown between the spread of coliform organisms in the air and the relative humidity or air temperature.

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