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ODOR CONTROL STUDY improvements on overall plant emissions , mass sulfur emission rates were estimated for each of these improvements . Applying measured Sludge Storage Tank emission flux rates to the area of the Aerobic Digesters provided an approximate reduction of Aerobic Digester emissions . An estimated 3 .4 pounds of sulfur per day was eliminated for each Aerobic Digester. Applying the Sludge Storage Tank emission flux rate to the area of the belt filter presses provided an approximate reduction in fugitive emissions collected by the hoods and covers . Approximately 1 . 0 pound of sulfur per day will be eliminated when the covers and hoods are completed . Of course these estimates are soft because the sources were not available for direct measurements . The hoods and covers over the belt filter presses should also reduce ambient concentrations of H2S in the Dewatering Building . However, open grating over the filtrate sump will likely allow significant emissions to escape into the Dewatering Building . Based on the observations made , the filtrate sump must be eliminated or covered in order to further reduce H2S concentrations in the Dewatering Building . Taken altogether, it is estimated that the elimination of the Filtrate Equalization Basin and Aerobic Digesters , and the enclosure of the belt filter presses , have reduced total plant emissions by approximately 9 . 6 pounds of sulfur per day. Figure 11 shows that this reduction represents an approximate 25 to 33 % reduction in sulfur emissions . How-ever, approximately 18 . 3 pounds of sulfur are still being emitted from the Central WWTF . As shown in Figure 12 , the highest mass sulfur emissions were found to originate from the RSF Scrubber, the Anoxic Tank, and the Sludge and Septage Storage Tanks (fugitive emissions) . These three sources represent approximately 97 percent of the total mass emissions that are currently emitted from the Central WWTF . 2 . 3 . 6 Other Minor and Transient Sources Other relatively minor and transient odorous sources were observed at the Central WWTF . Emission estimates were not prepared for these sources . However, based on engineering judgment , these source are not believe to create measurable off-site odor impacts . These include : • Open doors in the bar screen dumpster area . Inadequate ventilation in this area reportedly prevents the closure of these doors . • Openings at slide gates and bar screens on top of the Headworks Structure . Rubber gaskets can be used to seal these openings . • Grit removal units , dumpsters , and a mechanical sludge thickener are open to the atmosphere at the Sludge Storage Tanks . Emissions from these sources are transient, but highly odorous . Ceasing operations or enclosing these sources are the only methods of eliminating emissions from these sources . •"9 13 Indian River County, Central Wastewater Treatment Facility 1 PBSU #071230, February 2003