The Composition of Sewer Air
287
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During the course of these investigations, the authors also collected samples from main
sewers respectively near Traralgon and Werribee, in Victoria. At Traralgon, the main
outfall sewer of the Latrobe Valley carries wastes which include discharges from a large
kraft pulp mill, and from other industries including the manufacture of dairy products.
Samples of air from a drop chamber showed H 2 S and mercaptan levels of hundreds of
parts per million with aldehydes and amines at ppm levels, that is in higher relative
proportions than is normal for ordinary sewers. The C0 2 contents were around 3%.
The sewer near Werribee was that of a sulphide corrosion accelerated test installation.
The sewage was highly septic mixed municipal sewage from the city of Melbourne, and
the sewer air was abnormally "concentrated" due to the special circumstances under