Record Display for the EPA National Library Catalog


Main Title Magnesium carbonate : a recycled coagulant for water treatment /
Author Black, A. P.,
Other Authors
Author Title of a Work
Thompson, C. G.,
Black, A. P.
CORP Author Gainesville (Fla.). Department of Public Utilities.
Publisher United States Environmental Protection Agency, Office of Research and Monitoring,
Year Published 1971
Report Number EPA/620-R-71-051; 12120 ESW 06/71; EPA-12120-ESW; 09387,
Stock Number PB-209 938
OCLC Number 39559867
Subjects Water--Purification ; Magnesium carbonate
Additional Subjects Water--Purification ; Magnesium carbonate ; ( Water treatment ; Clarification) ; ( Coagulants ; Magnesium carbonates) ; ( Coagulation ; Water treatment) ; Precipitation(Chemistry) ; Magnesium hydroxides ; Calcium oxides ; Performance evaluation ; Sludge disposal ; Reclamation ; Regeneration(Engineering) ; Cost estimates ; Operating costs ; Chemical reactions ; Decoloring
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA 620-R-71-051 c.1 Headquarters Library/Washington,DC 11/07/2013
ELBD ARCHIVE EPA 620-R-71-051 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ELBD RPS EPA 12120-ESW-06-71 repository copy AWBERC Library/Cincinnati,OH 10/17/2014
ELBD  EPA 12120-ESW-06-71 AWBERC Library/Cincinnati,OH 12/18/2020
NTIS  PB-209 938 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation x, 106 pages : illustrations, figures, tables ; 28 cm
Laboratory investigations into the use of magnesium carbonate instead of alum for coagulation have demonstrated that the magnesium carbonate system produces a treated water with superior characteristics compared to water treated with alum. Both turbidity and organic color removals were comparable for both processes, and the flocs formed by the magnesium carbonate process were larger and heavier than alum flocs with better settling characteristics. The process involves the use of the magnesium carbonate as a coagulant and lime is added to precipitate gelatinous Mg(OH)2. The sludge, composed of a slurry of Mg(OH)2, CaCO3, and clay is carbonated and the Mg(OH)2 selectively and completely dissolved. Recycle after filtering allows re-use of both the magnesium carbonate and the sludge water. CaCO3 can also be recovered easily in large plants or landfilled at small ones. Chemical treatment costs for most waters can be substantially reduced using this system, while the quality of treated water will be superior to the quality of alum-treated water. (Author)
"June, 1971." "Research conducted by the Department of Public Utilities, City of Gainesville, Florida." Includes bibliographical references (pages 79-85).