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11.H.1. WEST REGIONAL WASTEWATER TREATMENT <br />FACILITY - PURCHASE OF ROTARY DRUM <br />THICKENER - ENVIRO SALES OF FLORIDA, INC. <br />The Board reviewed a Memorandum of July 18. 2001: <br />DATE: <br />TO: <br />THRU: <br />PREPARED & <br />STAFFED BY: <br />SUBJECT: <br />JULY 18, 2001 <br />JAMES E. CHANDLER <br />COUNTY ADMINISTRATOR <br />GENE A. RAUTH <br />OPERATIONS MANAGER DEPARTMENT <br />OF UTILITY SERVICES <br />TERRY SOUTHARD, WASTEWATER SUPERINTENDENT <br />PURCHASE OF ROTARY DRUM THICKENER, <br />WEST REGIONAL WASTEWATER TREATMENT FACILITY <br />BACKGROUND: <br />Indian River County currently owns and operates six Department of Environmental <br />Protection (DEP) permitted wastewater treatment facilities ranging in size from 0.020 <br />MGD to 2.0 MGD, for a total system wide treatment capacity of 7.08 mgd. To maintain <br />the biological process, sludge needs to be removed on a daily schedule and wasted <br />into a digester a each treatment facility for holding before being hauled by tanker trucks <br />in 6000 to 7000 gallon volumes to our Regional Sludge Treatment Facility The <br />concentration of the sludge being hauled ranges from 1.5 to 2.2 percent. <br />ANALYSIS: <br />The Utility's Wastewater Treatment Facilities currently on average treat in excess of <br />3 121 million gallons of raw sewage per day. Since the commissioning of these <br />facilities, certain operational and mechanical improvements have been made by the <br />operating staff to reduce operating costs. Staff has recognized that modernizing the <br />process with sludge thickening equipment would assist in daily process control of the <br />biological nutrient removal (BNR) operations and would provide long term operating <br />cost reductions. The Department currently operates two Parkson Rotary Drum <br />Thickeners Model 150 (RDT-150). One is located at the South Regional Wastewater <br />Treatment Facility and the other is at the Central Regional Wastewater Treatment <br />Facility. The Department of Utility Services has standardized on the RDT-150 based <br />upon operating staffs input The RDT-150's increase the concentration of sludge to <br />approximately 3.0% This increase of concentration provides a 30% to 50% reduction <br />in the volume of sludge that needs to be transported to the Regional Sludge Facility. <br />AUGUST 7, 2001 <br />81< 1 1 9 PG 1 21-} <br />• <br />-109- <br />