Record Display for the EPA National Library Catalog


Main Title Mathematical Model of the Electrodialysis Process.
Author Pruy, Kenneth T. ; Harringto, Joseph J. ; Smit, J. Douglas ;
CORP Author Process Research, Inc., Cambridge, Mass.
Year Published 1969
Report Number FWQA-14-12-410; FWQA-17090-FTA; 09525; 17090-FTA-07/69
Stock Number PB-200 721
Additional Subjects ( Desalting ; Electrodialysis) ; ( Electrodialysis ; Computerized simulation) ; ( Demineralizing ; Electrodialysis) ; ( Mathematical models ; Electrodialysis) ; Computer programs ; Cost estimates ; Membranes ; Design ; Fouling ; Industrial engineering ; Piping systems ; Operating costs ; Capital costs ;
Library Call Number Additional Info Location Last
NTIS  PB-200 721 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 78p
A desalination electrodialysis unit was established as a control volume, and material balances around the control volume were formulated, involving input and output flows, types of charged particles to be exchanged, concentrations of charged particles, and percentage removal of individual ions as well as percentage removals of total ions. Significantly parameters involved included spacer design geometry, membrane properties (resistivity, current efficiency, separation factors, etc.) and mode of operation of the stack (current density, products stream concentration, waste/product ratio, waste stream pH, etc.). Performance equations were then formulated for resistivity, D.C. power input, current efficiency, number of stacks required, and the pumping headloss. Cost analyses were derived to include: electrodialysis stacks, stack piping, distribution piping, and pumps for stack related costs; rectifiers and process electrical for D.C. power costs; and acid storage tanks, acid feed pumps, instruments, and miscellaneous equipment for auxiliary costs. Equations derived for capital costs and operational costs were based on the January 1965 Engineering News-Record cost index. The program was run for plants of 1, 10, and 100 MGD, with capital and operating costs being $164,620 and 7.07cents/1000 gallons respectively for a 1 MGD plant. Program flow charts as well as actual computer outputs are presented. (WRSIC abstract)