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Conditional Use Permit and Solid Waste Facility
<br />Narrative
<br />plant, The facility produces approximately 4D megawatts of electricity and operates 24
<br />hours per day, The facility is maintained and operated by 41 full-time employees,
<br />The Combustors:
<br />Energy is produced through combustion of RDF in three spreader stoker-fired excess air
<br />combustion units combustors or boilers}, The boilers are identified as emission Units ~,
<br />2, and 3, Unit 3 is approximately twice the size of units 1 and 2, The units are 128, ~ 28,
<br />and 268 mmDtulhr, respectively, which equates to approximately 11,7,11,7' and 24,4
<br />tons of RDF per hour, The combustors can also burn natural gas and fuel oil, Natural
<br />gas is used at start-up and as necessary to maintain proper combustion conditions;
<br />distillate fuel oil is used as a backup fuel to the natural gas. The combustion units were
<br />converted from burning coal to RDF in 1988,
<br />Air.Emissions Control equipment:
<br />All three of the combustion units boilers} are connected to common emissions control
<br />equipment, which are a dry scrubber for the control of acid gasses and a baghouse far
<br />the control of Particulate Matter FPM},The dry scrubber uses lime as a reagent in the
<br />chemical removal of the acid gasses, The lime is unloaded pneumatically to the lime
<br />storage silo, which is protected by a fabric filter baghouse from emitting PM during the
<br />unloading process, Exhaust gasses are continuously monitored for Carbon Monoxide
<br />ACC}, Sulfur Dioxide ~SC~}, Nitrogen Gxides ~N~x}, opacity, and oxygen ~G2}, A number
<br />of operating parameters, including scrubber exit baghouse inlet} temperature, and boiler
<br />feedwaterflow rate, are also monitored continuously, Airemissians are governed in the
<br />state of Minnesota by the Minnesota Pollution Contro! Agency under the Title V
<br />permitting program, ERS`s air permit is 1410003,
<br />Other air emission sources on site:
<br />Hot water for internal use when boilers 1, 2, and 3 are shut down is occasionally
<br />provided by a rented fuel-oi{-fired boiler, A propane-fired generator currently provides
<br />emergency electrical power, which will be replaced in the near term with anatural-gas-
<br />firedgenerator, The System Operations Control Emergency Generator is included in
<br />ERS Title V air permit but is maintained and operated by system operations,
<br />Vyater usage~and discharge:
<br />w - - -- ---.. - --
<br />System coaling is provided by once~through appropriations from the Mississippi River,
<br />Discharge and monitoring to the Mississippi is governed by the Minnesota Pollution
<br />Control Agency underthe National Pollution Discharge Elimination System ~NPDES}
<br />permitting program. Additional groundwater appropriations are used for scrubber
<br />operation and internal wastewater streams, Treatment is provided by a wastewater
<br />clarifier which discharges internally to the once-through cooling water discharge,
<br />Combustor waste_~ash~:
<br />Fly ash produced in the course of waste combustion is stored in an enclosed area at the
<br />facility. A fabric filter baghouse controls PM emissions during the conveyance of the fly
<br />ash, The ash is shipped from the site using covered trucks to a permitted ash-only cell
<br />that is owned and managed by RRT,
<br />S,1LegallEnvirvnmentallER5lAirlCity of ER - Cand,UsePermit1~009 Alt Fuels AmendmentlER CUP Arnen~ Narrative
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