Industrial Wastewater Discharge Permit Renewal - South Bend Ethanol, LLC

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South Bend Ethanol LLC Industrial Discharge Permit 3 PERMIT BRIEFING MEMO 1. Facility Description South Bend Ethanol, LLC engages in the conversion of corn to denatured, fuel-grade ethanol by processes of fermentation, distillation, and drying. As a by-product of ethanol production, SB Ethanol will also produce Distiller’s Dried Grain & Solubles (DDGS) and corn oil which will be sold for livestock feed. South Bend Ethanol’s facility is designed to operate 24 hours per day, seven days per week, with two twelve-hour shifts. SB Ethanol currently has 50 employees. Seasonal variation in production is not anticipated. 2. Discharge Description: Wastewater streams discharged at Sample Site Outfall # 3201 originate from three (3) locations. They are: Source of Wastewater Average Discharge (gpd) Maximum Discharge (gpd) 1 Process Water – Combined in the Neutralization Holding Tanks, includes wastewater from fermentation and water pumped from containment dikes following precipitation 300,000 750,000 2 Equipment/Facility Wash-down 110,000 200,000 3 Reverse Osmosis reject wastewater 10,000 20,000 Total average discharge flow 420,000 970,000 All of the wastewater is combined, treated, and discharged at the main lift station which is located at the southeast corner of the property along Calvert Street, and is the location for compliance monitoring. 3. Sample Site Description Sample Site Outfall # 3201 is located inside South Bend Ethanol’s lift station on the far southeast corner of SB Ethanol’s facility. The discharge is metered by South Bend Ethanol’s Doppler System. As the lift station fills up there are two pumps set at different levels in the pit to pump the discharge into the City of South Bend Sewer System. Inside the lift station there is a T-line for the collection of compliance samples. South Bend Ethanol’s sampler is connected to one end of the T-line and the Pretreatment staff attaches the Pretreatment Program sampling tubing to the other end of the T-Line. Both composite and grab samples are collected through the T-Line tubing using the pump in the auto-sampler to draw the sample into the bottles. The sampler flow monitor is connected to South Bend Ethanol’s flow meter in order to collect a flow proportioned sample.