Great Pond Reservoir Pilot Study

Partnership

Environmental Partners was built on the core philosophy that a strict focus on client service through partnership creates added value for our clients.

What's New

Partnership

Environmental Partners was built on the core philosophy that a strict focus on client service through partnership creates added value for our clients.

What's New

Great Pond Reservoir Pilot Study

Braintree, Massachusetts

Overview

Environmental Partners performed a Comprehensive Performance Evaluation of the existing treatment plant in Braintree, MA the results of which indicated that it was more effective and economical to replace the existing facilities with a new treatment plant, given the extent and magnitude of the repairs and modifications necessary to address its deficiencies and performance limiting factors.  Environmental Partners completed a pilot scale water treatability study and investigated treatment options for the future design and construction of a new drinking water treatment facility.

Approach

The scope of the pilot study was to evaluate two alternative high rate solids separation processes (dissolved air flotation and contact clarification) and three filtration processes (mixed media gravity filtration, granular activated carbon (GAC) filtration, and direct pressure filtration) for the production of high quality drinking water meeting the requirements of the Enhanced Surface Water Treatment Rule (ESWTR) and Disinfectants/Disinfection By-Product Rule.  Based upon a Pilot Test Proposal approved by DEP, the pilot study consisted of two seasons of testing, a cold water season and a warm water season.  Filter runs were monitored by Environmental Partners’ staff and on-line instrumentation for the collection of water quality and operational data.  This information was used to evaluate: chemical type; chemical dosage; media performance; and overall process effectiveness and   efficiency.  The proposed treatment of the new Great Pond treatment facility must be capable of the following: the removal of source water iron and manganese to levels consistently below Secondary Standards; the removal of low density particulates (algae, and floc formed from the coagulation of low turbidity waters containing NOM);  the removal of NOM (color and TOC);  and, a reduction in the production of distribution system disinfection by-products.

Solution

The most effective treatment for the oxidation and removal of iron and manganese consisted of the addition of potassium permanganate prior to the coagulant.  The coagulation/flocculation/clarification process that proved to be the most effective was dissolved air flotation with the use of a polyaluminum chloride coagulant.  The (GAC) filter media demonstrated the best filtration performance and secondary benefits of removing natural organic matter (NOM), tastes, and odors.