Record Display for the EPA National Library Catalog

RECORD NUMBER: 14 OF 52

OLS Field Name OLS Field Data
Main Title Effectiveness of a Contact Filter for the Removal of Iron from Ground Water.
Author Ki, Steve W. ;
CORP Author Alaska Univ., College. Inst. of Water Resources.
Year Published 1971
Report Number IWR-13; OWRR-A-025-ALAS; 11399,; A-025-ALAS(1)
Stock Number PB-202 211
Additional Subjects ( Filtration ; Water treatment) ; ( Iron ; Chemical removal(Water treatment)) ; ( Water softening ; Water filters) ; Ground water ; Alaska ; Sand filtration ; Anthracite ; Grain size ; Tests ; Porosity ; Permanganates ; Greensand
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB-202 211 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 53p
Abstract
Various types of modified filters were investigated to replace greensand filters which clogged when removing iron from ground water. A properly designed uniform-grain sized filter can increase the filtration time more than ten times that of ordinary sand or greensand filters. The filter medium was obtained by passing commercial filter material between two standard sieves of a close size range, so that the resulting medium was of a uniform size. The head loss rate on such a medium was independent of the filter depth and was inversely proportional to the almost 3/2 power of the grain size. On the other hand, the filter depth was almost linearly proportional to the time of protective action. The effects of the grain size, filter depth, and filter material on the filter run were evaluated with a synthetic iron water; and optimum filter depths for each unisized material were determined. At identical filtration conditions, anthracite had a 70 to 110% longer filter run than the sand medium, and it was attributed to the greater porosity of the former. The performance of unisized filters on permanganate-treated ground water was much better than that of fine-grained greensand. The validity of the filtration theory and equations developed by Heerje and Lerk was tested in regard to the relationship between T(1) (time of protective action) and grain size, and head loss rate and grain size. (Author)