SYMPOSIA PAPER Published: 01 January 1940

Prevention of After-Precipitation in Lime-Treated Industrial and Municipal Waters by Threshold Treatment


This brief discussion presents an economical and convenient procedure for stabilizing supersaturation in dilute solutions of calcium salts. Its pertinence to this symposium resides in the means it offers for preventing after-precipitation of calcium carbonate, which so often is a deterrent to or a perennial source of trouble in the use of lime in water treatment. The procedure is termed threshold treatment, because it does not involve, even distantly, any stoichiometric, relationships. Simple of application, its uses are manifold. A few of these will be described.

Author Information

Rice, Owen
Hall Laboratories, Inc., Pittsburgh, Pa.
Partridge, Everett
Hall Laboratories, Inc., Pittsburgh, Pa.
Hall, R.
Hall Laboratories, Inc., Pittsburgh, Pa.
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Developed by Committee: C07
Pages: 50–55
DOI: 10.1520/STP47166S
ISBN-EB: 978-0-8031-6968-5
ISBN-13: 978-0-8031-6480-2