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Membrane Microfiltration Water Treatment Plant

Awarded "Excellence in Engineering" by ACEC-NH

The Hanover Water Works Company is a small public water supplier that currently serves approximately 8,500 consumers. Its water source is unfiltered surface water obtained from a series of three connected reservoirs, located in two separate watersheds.

In 1994, chlorine dioxide disinfection was installed to comply with the Filtration Avoidance Waiver provisions of the SWTR. Over the past several years, consumer complaints related to color and odors increased. Additionally, the system required modifications to comply with the upcoming LT2ESWTR.

Wright-Pierce was retained to assess the viability of membrane microfiltration to address these and other future regulatory concerns. Piloting was completed using pilot units from two membrane manufacturers. The most effective and economical of these was selected for full scale implementation.

The design of the 3.5 MGD facility was completed using the PALL pressure-based system. 

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Project Highlights

Background

  • Unfiltered surface water
  • Increased demand

Challenges

  • Natural organic matter
  • Consumer complaints
  • Taste and odor issues
  • Manganese

Solutions

  • Pilot study conducted
  • Design and construction of a  membrane filtration water treatment plant
  • Compliance with LT2ESWTR and Stage 2 D/DBPR