Research Article
Apr 1968
Coliform Aftergrowths in Chlorinated Storm Overflow
Publication: Journal of the Sanitary Engineering Division
Volume 94, Issue 2
Abstract
Laboratory tests were conducted on the possible bacteriological effects of combined sewer storm overflows into a tidal estuary. A standard overflow mixture was diluted with 3 to 25 volumes of estuarine waters to represent dilutions expected under average storm conditions. Bacterial growths were observed in the raw overflow and at the various dilutions, using 3-1 flasks at 68○ F, with incubation periods up to 120 hr. MPN values of coliforms were determined after fixed time intervals. Without chlorination MPN values increased from 10 to 40 times the value at the point of discharge, or up to 13,000,000 coliforms per 100 ml after 30 hr of mixture with estuarine water. Chlorination to 15-min chlorine demand of the overflow liquid did not stop aftergrowth but reduced the aftergrowth by 70% to 90%, with peak values of 500,000 per 100 ml in 40 hr. These studies indicate that the aftergrowth phenomenon must be studied in the determinations of design criteria for the treatment of storm overflows from combined sewer systems.
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Published In
Journal of the Sanitary Engineering Division
Volume 94 • Issue 2 • April 1968
Pages: 371 - 380
Copyright
© 1968 American Society of Civil Engineers.
History
Published in print: Apr 1968
Published online: Feb 12, 2021
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Authors
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Rolf Eliassen, F.ASCE
Prof. of Sanitary Engrg., Stanford Univ., Stanford, Calif.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.