||Dilute solution reactions of the nitrate ion as applied to water reclamation /
Gunderloy, Jr, Frank C. ;
Fujikaw, Cliff Y. ;
Daya, V. H. ;
||North American Rockwell Corporation. Rocketdyne Division.
|| Federal Water Pollution Control Administration [Ohio Basin Region],
||DI-14-12-52; 1,; 1
( Nitrates ;
Water pollution) ;
( Reduction(Chemistry) ;
( Iron compounds ;
Oxidation-reduction reactions) ;
Water treatment ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||vi, 67 pages ; 28 cm.
A new and unexpected partial denitrification of dilute nitrate ion solutions (10 to 50 ppm NO3(-)-N) has been achieved by treatment with 8 moles of ferrous sulfate per mole of nitrate in unbuffered alkaline reactions. The nitrogen loss, which probably represents evolution of N2 or N2O, has been as high as 50%. Total reduction to lost nitrogen plus nitrite and/or ammonia has approached 100%. The reduction takes place in the presence of partially oxidized black iron hydroxides, and requires catalytic quantities of cupric ion. Denitrification is suppressed by phosphates, as well as by several other factors, some as yet unidentified. Silver ion catalysis or a 16-fold excess of the ferrous salt permits reduction to ammonia in the presence of phosphate, but there is no accompanying denitrification. (Author)
Includes bibliographical references (pages 45-63). Microfiche.