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62/,2.7/1997 09:67 <br />7193823242 <br />Coolinj Tower Water Treatment <br />NIXON POWER P~T <br />There are several chemicals we add to the cooling tower to control pH, scale, corrosion, and <br />bacteris/algae gowth. These are listed below. <br />PAGE 62 <br />Scale!Corrosion comrol: A proprietary blend from Calgon Cotp. consisting of a copolymer of sulfonic <br />acid and acryie acid, a diphosphonic acid, and polyphosphate. The blend is maintained at a concentration <br />of about 1l>0 ppm in the tower water , <br />H n r L Sulfuric acid is fed to the cooling tower to maintain a pH of 7.2 to 7.6. :~ ~ ~ ` <br />Cowper Corrision Control: The corrosion inhibitor above works well on steels, but not as well in ;, ~ ; (%ii'~ <br />protecting the copper and copper alloy in the plant from corrosion. We therefore feed an additional o,:.t ct.r <br />product to inhibit copper corrosion. This is a proprietary product consisting of a mixture of a ~ ~ <br />mercaptobenzothiazole and a tolytriazole. The concentration of this product is maintained at 4 ppm in <br />our cooling towers. <br />Bi~ide Control: The primary biological treatment in the cooling tower is designed to control the ~' ~ i> OS <br />bacteria. We currently continuously feed chlorine to maintain a free residual chlorine concentration of ~~'~-t <br />about 0.3 - 0,4 ppm. During the summer months we occasionally us an algaecide in the towers. We <br />currently use a product consisting of cyanoc~ithioimidocarbonate and methyldithiocarbamate. as a dose of <br />10 ppm. <br />