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.dune 07. 2004 John Jackson San Joaquin County EnN4onment Health Department 3`d Floor 301 E. XVeber Ave. Stockton. CA 95202 Flow in Pretreatment Svstern DELTA PLATING, INC. 818 S. Stanislaus Street Stockton, CA 95206 Telephone (209) 948-2768 hiconurig waters enter the system in the metal or chrome chambers. The cyanide chamber sloes not have incoming waters. In the chrome chamber, the ph is adjusted to 1-4 with the addition of spent muratic or sulfuric acid. Chrome 6 is converted to chrome 3 with addition of sodium metabisulfite. The over flow of this chamber is mixed with the heaw metal chamber. The heavy metal chamber is pump via a hard plumbed sump pump to the ph adjust portion of the system. The ph is adjusted with sodium hydroxide to 8-10. Tlie over flow goes to the polymer section. Polymer is added iii this chamber to form metal hydroxides. T'lie over flow goes to the clarifer section. The metal hydroxides being, hea-\--v tend to fall to th bottom of the chamber. The over flow water groes to the ph adjustment prior to discharge to city sewer. 1111 is adjusted with sulfuric acid to 6-9. The overflow goes through a screen into a chamber. From this clianiber, the reuse of water is pumped to the chrome rinse tank. Any over flow water is eased over screen prior to discharge to city sewer. T he metal hydroxides at the bottom of the clarifer section flow through time operated values to the holding tank. The metal hydroxides are allowed to settle in this tank. The over flow water returns to the metal chamber to start the process over. The metal Hydroxides in the holding tank are dew°ater tlu'ough a filter press. The excess water returns to the holdin¢ tank. v v Any bat;:li treatment of solutions are dew-ater via the filter press.. The excess water r;:Turn to the holding tank.