ILLCO-WAY
ILLINOIS
ionxchange
WATER TREATMENT
CO
Announces...
C O U I M T E R F L O W A N E W M E T H O D OF I O N - E X C H A N G E THAT PRODUCES BETTER Q U A L I T Y EFFLUENT AT LOWER
COST
Illinois Water Treatment Company has discovered and developed a corrective method which has been thoroughly tested and has proved consistently and fully effective.
FIG.
1 CONVENTIONAL REGENERATION
// has been recognized that breakthrough of ions, chiefly sodium, occurs in conventional ion-exchangers, causing a contamination of the effluent. This is due to layered retention of some metallic ions in the resin bed during normal operation. Studies show that these layers consist of Ca++ions near the upper part,Mg++ ions in the middle, and Na+ ions through the lower part of the resin bed. Conventional r e g e n e r a t i o n does not completely remove the bottom layer of sodium ions. When back on service, these sodium ions are then kicked out and appear as contaminants of the effluent.
T h e conventional method of regeneration is shown diagrammatically in Fig. 1. One form of the new ILLCO-WAY method is shown in Fig. 2. The principal feature of the new ILLCO-WAY method is the upward passage of the régénérant, combined with some form of barrier to keep the resin bed from expanding. Previous attempts at upward regeneration failed because the lowdensity resin materials now commonly employed have a tendency to expand and channel. The result was a very inefficient regeneration. Inc r e a s e d c o n c e n t r a t i o n s of t h e r é g é n é r a n t only a d d e d to c o s t s without significantly improving the results. Actual installation experience with the new ILLCO-WAY method shows an almost complete elimination of
R E P O R T T Y P I C A L
I L L I N O I S
W A T E R
8 4 0
STREET,
sodium contamination uniformly throughout each run. Fig. 2 illustrates one type of barrier that may be employed, namely, a downward pressure of water which keeps the resin bed from expanding. The mixture of -water and régénérant is drawn off by a distributor located near the resin face.
A
I N S T A L L A T I O N
An existing conventional two-bed ionexchange installation in Nebraska was converted to the new method described above. A study of results and operating costs over a six-month period shows a substantial improvement in the purity of the effluent (from a conductance of 25-5 micromhos to 6-0.5 micromhos) and a great reduction in cost of régénérants (from 7.34c per 1000 lbs. of effluent to 3.51c).
Many efforts have been made to overcome this undesirable situation, with limited success. Now, at last,
CEDAR
F R O M
FIG. 2 COUNTERFLOW REGENERATION
/ / the purity of the effluent from your de-ionization equipment is not satisfactory, we suggest you discuss immediately, with your Illinois Water Treatment representative, this new and effective method of correcting it. * "COUNTERFLOW" is the trademark of Illinois Water Treatment Company equipment utilizing a distinctly new principle of regeneration. Patent pending.
T R E A T M E N T ROCKFORD,
ILLINOIS
For further information, circle number 78 A on Readers' Service Card, page 129 A
78 A
INDUSTRIAL AND ENGINEERING CHEMISTRY
C O .
