Title:

DBP Reduction in a Rural Small-Scale Surface Water Treatment System

The New Hampton Village Precinct (NHVP) operates a small surface water treatment plant in New Hampton, New Hampshire. The precinct has reached out to Wright-Pierce and our team to find an alternate treatment process that will mitigate the formations of disinfection by-products (DBPs) in their drinking water. With budget and space constraints taken into consideration, the team decided to move forward with UV-LED treatment with chloramine disinfection as the chosen alternative for the treatment plant after choosing between five different alternatives. This choice is compact and cost-effective, while also meeting the water quality standards set by the U.S. Environmental Protection Agency (EPA) and enforced by New Hampshire Department of Environmental Services (NHDES). After selecting UV treatment, the team conducted bench testing to determine if UV-LED could be implemented instead of a traditional UV mercury lamp system. This included testing a UV-LED system for how many inactivation credits it can achieve as well as creating standard curves to better control the transmittance of the test water. After UV-LED was found to be a viable option, a construction sequencing outline was made which included when the plant can be left on and off for adjustments to the order in which our adjustments must be added and an estimate of the construction timeline. A cost estimate was also calculated including equipment and installation costs.

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