![]() You have to be careful not to try and treat solutions with too high CN or metals or it will be difficult. It's very pH and ORP sensitive but very effective. We also use the two stage process so we get complete destruction. We have to watch our bleach as it can lose some of the chlorine over time. We batch treat our CN with alkaline chlorination also. You might try lowering the pH with sodium bicarbonate, if this is indeed your problem. Optimum pH for alkaline chlorination is 10.5 - 11 and cyanide wastes are frequently higher than that in pH. You may have relied upon chlorine to do the pH adjustment that is frequently required before treating cyanide waste. But I would guess the cause of your problem is pH.Ĭhlorine gas is acidic, hypochlorite is alkaline. It's hard to say, without having a sample to look at, or more information. Has anyone encountered a difference in the reaction between chlorine gas versus 13% bleach? Tim S Crawfordsville, Indiana Has anyone else had problems with different reaction rates between jar tests and batch treatment? Jar tests work in 4 hours, however treating the batch generally requires 7-10 days to treat the batch. Now we are having problems treating the batches. ![]() With the Title V requirements, we changed from chlorine gas to aqueous bleach. We add Ferrous Sulfate to remove the copper prior to discharge to the POTW. We collect the rinse waters into a holding tank and treat 6000 gallons at a time. Plating, anodizing, & finishing Q&As since 1989Ĭyanide Wastewater treatment problems (batch system)įor years we have treated cyanide bearing waste waters by alkaline chlorination. ![]()
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