AWWA WQTC69376

This powerpoint presentation begins by presenting the following study objectives: analyze potential sources of MTBE (methyl tertiary-butyl ether) contamination based on publicly available information; conduct groundwater flow and contaminant transport modeling to evaluate short and long-term trends in MTBE concentrations; develop MTBE raw water and finished water design criteria; conduct comparative analysis of air stripping and granular activated carbon (GAC) such as cost estimates and life cycle cost analysis; and, select a treatment technology for application at Station 6. Project background includes the following: New York City (NYC) Department of Environmental Protection (DEP) is reactivating a series of groundwater wells in Brooklyn and Queens; the wells range in depth from 80 to 150 feet; and, water quality concerns include iron, manganese, hardness, and MTBE and tetrachloroethylene (PCE). Station 6 Demonstration Plant is a new 10-mgd treatment plant that treats water from 6 wells and provides treatment for the following: iron / manganese; volatile organic compounds (VOC's) removal; and, softening. Presentation conclusions indicate that GAC is recommended for VOC removal at the Station 6 Plant for the following reasons: lower initial capital cost and life cycle cost; more amenable to technology changes/upgrades; smaller overall footprint; simpler building design; and, ability to treat range of contaminants (concentrations and types). Includes tables, figures.