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ODOR CONTROL STUDY <br /> • Total construction and engineering costs for the above improvements are <br /> estimated to be approximately $270 , 000 . Additional operating costs are <br /> estimated to be between $ 30 , 000 and $45 , 000 per year. <br /> • Since the RSF dewaters about 13 , 000 wet tons of septage and sludge per year, <br /> these conservatively estimated costs equate to approximately $4 . 50 to $ 5 . 75 per <br /> wet ton of sludge . Based on our experience , these costs probably represent less <br /> than a 10 % increase in sludge dewatering and disposal costs , and are relatively <br /> minor compared to costs to relocate the RSF or employ an alternative sludge <br /> disposal technology. <br /> • Construct and operate a new sodium hypochlorite storage and feed system if the <br /> existing chlorine generation facility is found to be inadequate upon further review, <br /> or if the new system is desired by the County. Construction and engineering <br /> costs for a new sodium hypochlorite system are estimated to be approximately <br /> $ 130 , 000 . <br /> Anoxic Tank Improvements <br /> • Construct and operate an activated sludge internal recycle system to allow <br /> improved biological oxidation of odorous compounds in the Anoxic Tank. <br /> • Construct aluminum or fiberglass covers over- the Anoxic Tank and collect <br /> odorous air from the headspace under the covers . <br /> • Construct and operate a modular biofilter for controlling the odorous emissions <br /> from the Anoxic Tank. <br /> Total construction and engineering costs for the above improvements are <br /> estimated to be approximately $ 520 , 000 . <br /> Sludge and Septage Storage Tanks Improvements <br /> • Add a permanent drain for the mechanical thickener so that all hatches and <br /> covers can remain closed . <br /> • Open the dampers on the Sludge and Septage Storage Tanks so that the <br /> headspace in the tanks can be ventilated more effectively. <br /> • Total construction and engineering costs for the above improvements are <br /> estimated to be approximately $ 50 , 000 . <br /> 1 Lr.i II Indian River County, Central Wastewater Treatment Facility <br /> / PBS&J #071230, February 2003 <br />