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4 <br /> ODOR CONTROL STUDY <br /> Contents <br /> Section <br /> 1 . 0 Introduction 1 <br /> 2 . 0 Mass Odor Emission Inventory 2 <br /> 2 . 1 Air Emission Testing Methodologies 3 <br /> 2 . 2 Mass Emission Rates 5 <br /> 2 . 3 Findings and Observations From Sampling Program g <br /> 2 . 3 . 1 -Olfactory Measurements 9 <br /> 2012 Sulfur Emissions 9 <br /> 2 . 3 . 3 Regional Sludge Facility Sulfur Mass Balance 10 <br /> 2 . 3 .4 Impact of Dewatering Operations on Emissions 10 <br /> 2 . 3 . 5 Impact of Recent Improvements on Emissions 12 <br /> 2 . 3 . 6 Other Minor .and Transient Sources 13 <br /> 2 .4 Conclusions from Mass Emissions Inventory 14 <br /> 3 . 0 Odor Control Alternatives 15 <br /> 3 . 1 Anoxic Tank 15 <br /> 3 . 1 . 1 Biological Oxidation 15 <br /> 3 . 1 . 2 Cover and Conti-ol with-New Scrubber 15 <br /> 3 . 1 . 3 Cover and Control with New Biofilter 16 <br /> 3 . 1 .4 Cover and Control with RSF Scrubber 17 <br /> 3 . 1 . 5 Recommended Improvements 18 <br /> 3 . 2 Regional Sludge Facility 18 <br /> 3 . 2 . 1 Existing Odor Scrubber 18 <br /> 3 . 2 . 2 Sludge and Septage Storage Tanks 20 <br /> 3 . 2 . 3 Consideration of Alternative Technologies 22 <br /> 3 . 2 . 4 Recommended Improvements 22 <br /> 4 . 0 Air Dispersion Modeling 23 <br /> 4 . 1 Model Limitations 24 <br /> 4 . 2 Odor Detection Thresholds 24 <br /> 4 . 3 Air Dispersion Modeling Results 25 <br /> 4 . 4 Air Dispersion Model Conclusions 25 <br /> 5 . 0 Cost Benefit Analysis 26 <br /> 6 . 0 Improvements to Minor and Transient Sources 28 <br /> 7 . 0 Other Issues 28 <br /> 8 . 0 Conclusions and Recommendations 29 <br /> 8 . 1 RSF Scrubber Improvements 29 <br /> 8 . 2 Anoxic Tank Improvements 30 <br /> 8 . 3 Sludge and Septage Storage Tanks Improvements 30 <br /> 8 . 4 Other Minor and Transient Sources Improvements 31 <br /> 8 . 5 Dewatering Building Improvements 31 <br /> 8 . 6 Proposed Improvement Budget and Schedule 31 <br /> Appendix <br /> Utility Advisory Committee Presentation - February 5 , 2003 <br /> 1 J '9 v Indian River County, Central Wastewater Treatment Facility <br /> 1 PBS&J #071230, February 2003 <br />