288
D.K.B. Thistlethwayte and E.E. Goleb
which the sewer pipeline was operated.
The H 2 S concentrations found were around 200 to 300 ppm, representing nearly a 100
fold concentration compared with the sewer air tested in Sydney. C0 2 concentrations
however were only about 1.2%.
Table 4 shows concentrations of Group 4 constituents as normally reaching levels
about 50 to 100 times less than H 2 S levels, ignoring the unusually high values sometimes
observed for H 2 S over short periods, but the relative levels observed in the sewer air at
Werribee on the one sampling day seemed rather of the order of 5 to 10 times less. The
concentrations of aldehydes particularly were comparatively high both at Traralgon, close
to 100 ppm, and at Werribee up to 40 to 50 ppm. However the authors have no data for
the composition of sewer air from normal operating sewers in Victoria.
ACKNOWLEDGEMENTS
The authors are grateful to the Metropolitan Water, Sewerage and Drainage Board, of
Sydney, Australia, for financial support, and also the staff of their Chemical Branch for
their valuable co-operation and assistance, especially Messrs, C. Kimpton, Chemist and B.
Donnelly, Technician. They acknowledge also the assistance of the Latrobe Valley Water
and Sewerage Board and of the Melbourne and Metropolitan Board of Works, especially
Messrs. F. Westbrook and J. Mitchell, and the co-operation of the Department of Applied
Organic Chemistry of the University of New South Wales.
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