Brown and Caldwell Home Page

Brown and Caldwell engineers and scientists are technical and thought leaders in the environmental sector. Meet the people who have been advancing innovation for more than 70 years.
Author      Title/Abstract      

Calcium Control During Lime Treatment of Municipal Wastewater
Author: Bruce Douglas, Edwin R. Bennett

Lime treatment is a common process in wastewater reclamation plants. It is the first process applied to secondary-treated municipal wastewater at the Potable Water Reuse Demonstration Plant in Denver, Colorado; Water Factory 21 in Orange County, California; the Fred Hervey Reclamation Plant in El Paso, Texas; and the Upper Occoquan Sewage Authority reclamation plant in Centreville, Virginia. Lime treatment provides the following improvements to a wastewater: 1. Clarification, by colloid destabilization and the sweeping action of precipitation floc. 2. Disinfection, by inactivation of virus and bacteria at high pH and the removal of infested turbidity during clarification. 3. Removal of undesirable inorganic constituents, by the interaction of lime or other treatment chemicals with the wastewater. The subject of this paper is the removal of the undesirable constituent, calcium.

This library contains published materials for which copyrights may be owned by entities other than Brown and Caldwell, but which are stored for limited uses by BC employees. Technical papers authored by BC employees generally may be printed and shared electronically with clients and prospective clients outside BC. Technical papers cannot be sold, and technical papers shared outside BC must have proper attribution of the original sponsoring organization or conference where the paper was presented. This attribution is embedded in each technical paper file when it is loaded into this library. Published articles from magazines or trade journals which are stored in this library are FOR INTERNAL USE ONLY and SHOULD NOT be distributed to clients or others outside BC, without express permission of the copyright owner. For questions regarding copyrights associated with any document in this library, or questions regarding copyrights in general, contact the Legal Department.