Transcription of OPERATOR ESSENTIALS - Water Environment Federation
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OPERATOR ESSENTIALS - Water Environment Federation
66 WE&T l MARCH 2011 l OPERATOR ESSENTIALSWhat every OPERATOR should know about sodium hypochloriteRob BaurKnowledgePrincipleA practical considerationSodium hypochloriteSodium hypochlorite is chlorine gas dissolved in sodium hydroxide. This is essentially household hypochlorite is a disinfectant that is liquid at room temperature and can be dosed with chemical feed chemistryNa+ OCl + H2O > H+ OCl + Na+ OH Hypochlorite (OCl ) is the disinfecting ion in this compound. The hydroxyl ion (OH ) increases the solution s overall hydroxideSodium hydroxide (NaOH) is often called caustic compound has an extremely high pH when dissolved in hypochlorite strengthCommon hypochlorite sold in stores (household bleach) is chlorine since lower concentrations are more stable. Industrial hypochlorite is 12 to 15 trade percent strength hypochlorite concentration typically is measured in trade percent.
CPVC has a higher temperature rating. PVC is the cheaper alternative and is readily available. PVC glue Normal glue uses fumed silica (finely ground glass) for thickening. The high pH of the hypochlorite solution can dissolve the silica, leaving the glue joint porous and susceptible
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