Crucial parameters for you to decide whether pure water can be recirculated or not are conductivity and TOC . Water preparation before demineralisation also requires on-line analyzers to ensure residual chlorine, and alkalinity levels are sufficiently low to avoid reverse osmosis membrane deterioration and scaling. As semiconductor manufacturing processes require huge quantities of acids and other chemicals, fabs have to treat their effluents before discharging them into the environment. Zellweger Analytics has experience in providing instruments for control in waste water treatment plants. Amongst the most commonly monitored parameters in this industry are fluoride, ammonia, pH, conductivity and phosphate .
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