Laserfiche WebLink
ODOR CONTROL STUDY <br /> Existing Conditions without Filtrate Equalization Basin Emissions (Figure 15) <br /> and Aerobic Digester Emissions (October 2002) <br /> Option 1 - Elimination of RSF Fugitive Emissions (Figure 16) <br /> 100 % Reduction in Fugitive Emissions from Sludge and Septage Storage Tanks <br /> via Improved Ventilation and Sealed Covers <br /> Option 2 - RSF Scrubber Improvements (Figure 17) <br /> 90 % Reduction in Scrubber Emissions via Recommended Scrubber Changes <br /> Option 3 - RSF Scrubber and Fugitive Emissions Improvements (Figure 18) <br /> Improvements in Options 1 and 2 <br /> Option 4 - Minimum Anoxic Tank Improvements (Figure 19) <br /> 50 % Reduction in Anoxic Tank Emissions via Internal Recycle <br /> Option 5- Maximum Anoxic Tank Improvements (Figure 20) <br /> 90 % Reduction in Anoxic Tank Emissions via Covers and Packed Tower Scrubbers <br /> Option 6 - RSF Scrubber and Minimum Anoxic Tank Improvements (Figure 21) <br /> Improvements in Options 3 and 4 <br /> Option 7 - RSF Scrubber and Maximum Anoxic Tank Improvements (Figure 22) <br /> Improvements in Options 3 and 5 <br /> 4. 3 Air Dispersion Model Results <br /> The model was run using meteorological data from the year 1991 . The model was also <br /> run using meteorological data from previous years and results obtained were similar to <br /> the results for the year 1991 . Thus , meteorological data from the year 1991 was <br /> assumed to be representative of the atmospheric conditions around the treatment plant . <br /> The data from the output file was used to calculate the locations of the 5 and 1 ppbv <br /> concentration isopleths . <br /> Figures 14 through 22 depict the sulfide concentration isopleths for the second worst <br /> hour at the Central WWTF treatment facilities . <br /> 4 . 4 Air Dispersion Model Conclusions <br /> A comparison of the isopleths shows a significant reduction in the odor detection area <br /> with each improvement. As noted above , it is assumed that the area of potential odor <br /> detection under worse case meteorological conditions lies within the 1 ppbv isopleth . <br /> This isopleth extends beyond the mapping limits in Figures 14 and 15 . As can be seen <br /> on the figures , as additional improvements are made , the areas of potential odor <br /> detection and recognition decrease significantly. Reduction in RSF Scrubber emissions <br /> ( Figure 17 ) reduces the areas the most and reduction of Anoxic Tank emissions by 90 % <br /> s9 25 Indian River County, Central Wastewater Treatment Facility <br /> 111 PBS&J #071230, February 2003 <br />