Record Display for the EPA National Library Catalog


Main Title Neutralization of Acidic Wastes by Crushed Limestone.
Author Pearson, Frank H. ; McDonnell., Archie J. ;
CORP Author Pennsylvania State Univ., University Park. Inst. for Research on Land and Water Resources.;Office of Water Resources Research, Washington, D.C.
Year Published 1974
Report Number Research Pub-79; DI-14-31-0001-3838; OWRR-A-030-PA; W74-10694 ; OWRR-A-030-PA(1)
Stock Number PB-234 549
Additional Subjects Neutralizing ; Limestone ; Acidty ; Hydraulics ; pH ; Alkalinity ; Experimental data ; Reaction kinetics ; Mathematical models ; Crushed stone ; Surface chemistry ; Turbulence ; Temperature ; Industrial waste treatment ; Surfaces ; Computerized simulation ; Computer programs ; Mine waters ; Mine acid drainage ; Ionic strength
Library Call Number Additional Info Location Last
NTIS  PB-234 549 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 164p
Experiments conducted to determine the reactivity of crushed limestone in acidic water were designed primarily to simulate the neutralization of acidic streams by barriers of crushed limestone, although the results obtained appear to be more widely applicable. Acidified water, at pH values ranging from 2 to 7, was circulated over crushed limestone in the size range 2-1/2 to 4 inches. Water samples were withdrawn periodically for determination of alkalinity and acidity, from which the kinetics of the two slower chemical reactions that limit the overall process could be determined. These are the reaction between hydrogen ions and solid calcium carbonate, and the exsolution of carbon dioxide. For each of these reactions the dependence of the rate constant on temperature, ionic strength, and water turbulence was established. Two linked differential equations were derived, and solved simultaneously to obtain a description of the neutralization process.