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GRE Options <br /> • Injection of biosolids into boiler <br /> — Determined not feasible due to air permitting issues and <br /> minimal energy benefit <br /> • Injection of biosolids into ductwork following <br /> combustion chamber <br /> — Determined not feasible due to air permitting issues and <br /> minimal energy benefit <br /> • Use liquid biosolids as makeup to bottom ash system <br /> — Determined not feasible due to potential health and <br /> processing concerns <br /> • Deposit biosolids on ash conveyor or ash pile <br /> — Not feasible due to long term hauling costs for the City <br /> BOLTON 8, M B N K , I NC® <br /> Consulting Engineers & Surveyors <br /> 5 <br />