Karel V Zadera

US Patent:

40595137, Nov 22, 1977

Filed:

Feb 22, 1977

Appl. No.:

5/770826

Inventors:

Karel V. Zadera - Dover NJ

International Classification:

C02B 120
C02B 502
C02C 502
B01D 2101

US Classification:

210 45

Abstract:

High sulfate content water is treated in a multistage process to remove sulfate and hardness. Sulfate concentration is reduced in the first stage of the process by addition of calcium hydroxide. Calcium concentration is reduced in the second stage of the process by reaction of carbon dioxide or bicarbonate and calcium and hydroxide ions from the first stage of the process, forming insoluble calcium carbonate.