NIPSCO’S CHALLENGE National Pollutant Discharge Elimination Permit (NPDES) restrictions limited cooling tower disinfection dosage to only two hours a day for each tower. During the warm weather summer months, the 2 hour/day restriction did not allow enough dosage to control microbiological growth in the cooling water. NIPSCO’s Chemical and Environmental Compliance Department was using a chemical regimen of sodium hypochlorite, sodium bromid

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