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ODOR CONTROL STUDY 1 . 0 Introduction The Indian River County Department of Utility Services has been receiving odor complaints from neighbors of the Central Wastewater Treatment Facility ( Central WWTF ) . The existing Regional Sludge Facility ( RSF ) , which is located on the Central VW/TF site , has been the focus of these complaints . In response to the complaints , the Department of Utility Services commissioned odor control improvements to the RSF . The improvements focused on improving collection of odorous emissions within the belt filter press area of the RSF . Hoods and covers were constructed over the existing belt filter presses and conveyors so that emissions from these sources could be more efficiently collected . More efficient collection of odorous emissions would improve working conditions within the RSF and reduce emissions of odorous gases to the atmosphere . Odorous emissions collected by the hoods and covers would be delivered to the existing odor control scrubber, where they would be treated and removed before the air is discharged to the atmosphere . Understanding that these improvements do not comprehensively address odor emissions from this site , the Department of Utility Services invited PBS &J to visit the Central WWTF and offer guidance on approaches to further reduce odorous emissions . On April 18 , 2002 , PBS &J visited the Central WWTF to observe operations and conduct a preliminary assessment of odorous emissions from all the treatment processes at the Central WWTF . Following the visit, PBS &J suggested that significant odorous emissions might be originating from several facilities other than the RSF . The existing Sludge and Septage Storage Tanks , Aerobic- Digesters , Filtrate Equalization Basin , and Anoxic Tank were specifically identified as -facilities that might be emitting significant odorous emissions . PBS&J recommended a mass odor emission inventory be conducted for these facilities . A mass odor emission inventory involves collecting and analyzing air samples from the suspected odor generation facilities . The inventory quantifies the mass of odor emissions generated at various locations and identifies the odorous compounds that require control and/or treatment . By defining mass odor emission rates at each facility, the County would be able to objectively prioritize the most important odor generation areas and better assess the types of improvements and corresponding odorous compound removals that are needed . In September 2002 , the Department of Utility Services commissioned PBS &J to perform this comprehensive odor control study for the Central WWTF . The objectives of this study were to : • Develop a mass odor emissions inventory of odorous compounds from existing treatment facilities . • Evaluate the performance of recent odor control improvements at the Regional Sludge Facility. • Evaluate and recommend appropriate methods for reducing emissions of odorous compounds . �♦J Indian River County, Central Wastewater Treatment Facility 111 PBS&J #071230, February 2003