AWWA JAW19610

Research was conducted to determine the applicability of weak-acid ion exchange resins for removing hardness, barium (Ba), and Radium (Ra) from groundwater. The capacity and regeneration requirements of the resin were determined and compared with those of strong-acid resin. Results indicate that weak-acid resin in the hydrogen form effectively removes hardness, Ba, and Ra without increasing the sodium content of the product water. The maximum capacity of the weak-acid resin was about 2.3 times that of strong-acid resin. Metal ions such as Ba do not accumulate on weak-acid resin during use, because essentially complete regeneration is possible with 5-10 percent excess regenerant. Much less spent regenerant per unit volume of water treated is produced from a weak-acid column than from a strong-acid column. However, there are disadvantages to the weak-acid resin: excessive swelling during exhaustion; acid-resistant materials must be used; noncarbonate hardness cannot be removed; carbon dioxide must be stripped from the produce water; and the cost of treatment is likely to be greater. Includes 19 references, tables, figures.

Product Details

Edition:

Vol. 78 - No. 9

Published:

09/01/1986

Number of Pages:

7

File Size:

1 file , 1.4 MB