Solving a complex chlorination problem

Abstract

Sander Industries; a paperboard manufacturer whose name has been changed for confidentiality, uses Fenton's reaction to treat its high-strength specialty board wastewater before discharge. While this practice controls phenols in the company's wastewater, it interferes with the publicly owned treatment works (POTWs) disinfection process in Realville, Miss., a fictional city. When the company's wastewater is being discharged to POTW, violations of effluent fecal coliform and total residual chlorine (TRC) levels frequently occur. The wastewater has caused the TRC level to increase, even when the chlorine dosage was reduced to less 2 mg/L. Most important, the TRC was not disinfecting properly, resulting in more than 1,000 fecal coliform organisms per 100 mL (the maximum allowable National Pollutant Discharge Elimination System permit limit). The POTW conducted a number of full-scale experiments to demonstrate that higher chlorine dosages would be effective, but the TRC limit of 2mg/L was exceeded. Engineers recommended a dechlorination system to give POTW operators and the manufacturer the greatest flexibility in the operation and growth of their respective facilities. Some equalization of the company wastewater will be required. The company will continue the Fenton's reagent pretreatment and its practice of stretching the period of wastewater release over 4 or 5 day of continuous discharge. The city of Realville has agreed to install dechlorination facilities, and the company will assume a major portion of the capital costs of the system.

Publication Title

Water Environment and Technology

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