ClorTec® An Operational Profile of a Pennsylvania Water Treatment Plant’s On-site Hypochlorite Generating System

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Courtesy of De Nora Water Technologies

For more than 30 years, on-site generation of sodium hypochlorite has been a key process in water treatment for municipal and industrial applications. The benefits of the on-site generation process over chlorine gas and bulk hypochlorite have been well documented and include:
  • Eliminate bulk storage of hazardous chemicals
  • Reduce risk to plant personnel because of drastically eliminate hazardous material (HazMat) storage and handling
    requirements
  • Remove transportation liabilities, risks and costs
  • Reduce threat to public safety
  • Process and risk safety management exemptions
  • Lower disinfection byproducts
  • Consistent solution concentration
  • A simple, cost effective product

In 1999, United Water Pennsylvania, a water utility serving more than 150,000 people in eight counties in the Keystone
state, installed a ClorTec® Model MC 100 System to replace chlorine gas cylinders at its Hummelstown Water Treatment Plant (WTP) just east of Harrisburg. The plant is a conventional WTP consisting of prechlorination, coagulation, clarification, granular media filtration and post chlorination. The water source for the Hummelstown plant is the Swatara Creek, the turbidity, pH alkalinity and hardness of which can vary significantly.

As part of the U.S. Environmental Protection Agency’s (EPA) Environmental Technology Verification program (ETV), the EPA and NSF International verified the performance of the Hummelstown system at installation. The concentrated hypochlorite generator stream from the treatment system underwent a twice-daily analysis from March 8 to April 6, 2000 using the Standard Methods for the Examination of Water & Wastewater established by the American Public Health Association, the American Water Works Association and the Water Environment Federation.

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