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Disinfection By-Products Reduction Study

Wolfeboro's Upper Beech Pond water filtration facility treats a high quality surface water with upflow clarification, conventional filtration, and disinfection using sodium hypochlorite. The Wolfeboro system needed to find ways to comply with Stage 1 and Stage 2 Disinfection By-Product (DBP) Rules without incurring large capital improvement costs or on-going O&M costs. 

Wright-Pierce was hired to identify methods for ensuring system compliance. Processes and records were examined to identify trends and determine potential areas of improvement. On-site field investigations included a tracer study of the disinfection basin, and DBP formation potentials to determine process  performance. A simulated distribution system test evaluated DBP formation rates.

The initial components of the phased DBP reduction program included changes to both the pre-oxidation and disinfection processes, and the distribution system operations, with future actions identified for step-by-step implementation.

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Project Highlights

Background

A medium surface water system consisting of upflow clarification, conventional filtration and
treatment processes to meet their mandate to protect public health and public confidence in their water supply.

Challenges

For an exceptionally clean source and finished water, to identify inexpensive process and operational changes throughout the water system that will allow compliance with the Stage 1 and Stage 2 Disinfection By-Product Rules.

Solutions

A study was completed identifying options, actions, and associated costs allowing the initiation of low-cost solutions before resorting to more expensive solutions.