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Utilities Services Item INDIAN RIVER COUNTY, FLORIDA DEPARTMENT OF UTILITY SERVICES Date: April 25, 2017 To: Jason E. Brown, County Administrator From: Vincent Burke, P.E., Director of Utility Services Subject: Update on the Residuals Dewatering (Biosolids) Facility BACKGROUND On April 11, 2017, the Indian River County (IRC) Board of County Commissioners (BCC) approved the Florida Department of Environmental Protection (FDEP) Consent Order 17-0072 for the West Regional Wastewater Treatment Facility (WRWWTF). The plant will be operating under intense scrutiny by the FDEP for the next two years, facing potential financial penalties for any exceedances of the permit limits. ANALYSIS In November 2015 during the permit renewal process for the WRWWTF, the FDEP recognized significant fluctuations with loadings into the facility. At that time, the FDEP issued a compliance schedule requirement for Indian River County Department of Utility Services (IRCDUS) to perform an Industrial Waste Survey to characterize the waste stream that comprises the influent to the WRWWTF and identify the cause of the elevated loadings. That process has been underway since April 2016. In January 2017, the FDEP informed IRCDUS of their intent to file a consent order with IRCDUS due to on- going permit limit exceedances observed at the WRWWTF. In advance of the consent order, IRCDUS enlisted the help from an outside consultant to assist the operators in troubleshooting plant processes. The findings from these investigations were presented to IRCDUS on February 10, 2017. Shortly after receiving this report, IRCDUS completed the industrial waste survey in accordance with compliance schedules in the permit. Results from this investigation, coupled with findings from the consultant's work, pointed to the Residuals Dewatering Facility (RDF), also known as the biosolids facility, as a main contributor to the WRWWTF's exceedances (see Figure 1). Figure 1. Total Nitrogen Concentrations and Loadings In Plant Influent mg/L lbs. 200 4,000 180 ---- -- -- - - -- -- — -_ - ... .. - - - - - - - - - - -- 3,500 160 - - - - -- - - -- - - - - 140 - - - - - - -- - - - -- - - 3,000 ............................................................................. . 120 - - - - - - - 2,500 100 - - - -- - - 2,OD0 80 -- - - - 1,500 60 ` - ---- Note: Calculated 40Note: AVG. design mg pounds is based 1'000 loading is at 6.0 MGD Ibs.- 20 — ---MM lbs/day on daily avg. flow SDI) and MM is at 7.8 MGD ... AVG. lbs/day of 2.3 MGD 0 07/07/16 08/07/16 09/07/16 10/07/16 11/07/16 12/07/16 01/07/17 Note: Dotted line reflects maximum design influent loading for Nitrogen at plant capacity of 6 MGD, solid red line shows plant capacity being used at the current flow of 2.3 MGD. Page i of 8 C:\Users\GRANIC-1\AppData\Local\Temp\BCL Tech nologies\easyPDF 7\@BCL@6005C827\@BCL@6005C827.docx P215