# Attachment 1

Iatan PresentationApril 28, 20101Kansas City Power & Light CompanyIatan Generation StationApril 28, 2010Paul Ling – Environmental ManagerGary Brown – Station AQC SuperintendentNick Voris – Station AQC EngineerTom Mackin – Station ManagerApril 28, 20102KCP&L Iatan Generation StationSite LocationIatanGenerationStationApril 28, 20103KCP&L Iatan Generation StationStation IntroductionUnitYearCompletedLocation Fuel Net MWKCP&LMWGMOMWGPEMWOperator Other OwnersIatan 1 1980 Iatan, MO PRB 705 494 127 620 Kansas City Power & Light Empire District Electric - EDE70% 18% 88%Iatan 2 2010 Iatan, MO PRB 850 465 153 618 Kansas City Power & Light EDE (102 MW),KEPCO (30 MW) and54.7% 18% 72.7%Missouri Joint MunicipalElectric Utility Commission -MJMEUC (100 MW)Iatan Unit 1Retrofit installation of a new air qualitycontrol system (SCR, FGD, Baghouse) onexisting sub-critical pulverized coal generating unit optimizing use of existing plantinfrastructure.Iatan Unit 2New 850 MW super critical pulverized coal generating unit with new air qualitycontrol system (SCR, FGD, Baghouse) in initial startup.April 28, 20104KCP&L Iatan Generation StationAir Quality Control EquipmentApril 28, 20105KCP&L Iatan Generation StationAerialApril 28, 20106KCP&L Iatan Generation StationStation Site Layout DrawingApril 28, 20107KCP&L Iatan Generation StationGeneration Area Site Layout DrawingApril 28, 20108KCP&L Iatan Generation StationZLD Area Site Layout DrawingApril 28, 20109KCP&L Iatan Generation StationZLD Area Site Layout DrawingApril 28, 201010KCP&L Iatan Generation StationNPDES Station Outfall DrawingApril 28, 201011KCP&L Iatan Generation StationStation NPDES Operating PermitsNPDES Operating Permit MO-0082996Outfall 001 – once through coolingOutfall 002 – sanitary water treatment plantOutfall 003 – washdown, blowdown, backwash, coal pile runoff, andstormwater runoffOutfall 007 & 008 – stormwater runoffNPDES Operating Permit MO-0135062Outfall 010 – utility wastelandfill leachate collection pondOutfall 011 - utility waste landfill stormwater collection pondApril 28, 201012KCP&L Iatan Generation StationBottom Ash HandlingBottom Ash – Units 1 & 2•Submerged flight conveyor removes wet pyrites, bottom ash and economizerash from the water impoundment directly underneath the boiler furnace.•Ash is continuously removed and discharged into the bottom ash bunker.•Ash is loaded from the bottom ash bunker into trucks and beneficially usedoffsite or deposited in the onsite landfill.•Submerged flight conveyor drain systemcollects area drains and conveys thewater back to system orother systems in the plant.•Overflow drains from the submerged flight conveyor system are directed to aoverflow tank and ultimatelyto the Unit 2 cooling tower blowdown or clarifiers.April 28, 201013KCP&L Iatan Generation StationBottom Ash HandlingUnit 1Bottom Ash – Submerged Flight ConveyorBottom Ash Storage forBeneficial UseApril 28, 201014KCP&L Iatan Generation StationFly Ash HandlingFly Ash – Units 1 & 2•Dry fly ash is transferred pneumatically from the baghouse hoppers to the flyash storage silo.•Fly ash is either unload through a wet ash conditioner for transferby trucks to bedeposited in the onsite landfill or dry totrucks for beneficial use offsite.•The wet ash conditioner uses service water or brine from the ZLD for dustcontrol.April 28, 201015KCP&L Iatan Generation StationGypsum HandlingGypsum – Units 1 & 2•Gypsum is conveyed from the rotary drum vacuum filter in the dewateringsystem to the gypsum stack out.•Gypsum can emergency stack out orlonger-term radial pile stack out.April 28, 201016KCP&L Iatan Generation StationGypsum HandlingGypsum Radial Stack Out PileGypsum Emergency Stack Out PileApril 28, 201017KCP&L Iatan Generation StationFGD - AbsorberFGD - Absorber – Units 1 & 2•The absorber is a large vessel consisting of a spray tower and a reaction tankutilizing limestone slurry to chemically react with the flue gas.•The slurry from the reaction tank is continuously pumpedby the recycle pumps tospray headers in the absorber.•The recycle slurry, composed of gypsumand limestone, ispumped from thereaction tank to the hydrocyclone classifier when the slurry density reaches ahigh point.•The hydrocyclone classifier separatesthe feed into overflow and underflow.•The overflow, which is lower in solidsconcentration, is directed the the reclaimwater system.•The underflow, which is higher in solids concentration, is directed to the gypsumdewatering system.•The absorber reaction tank receives relatively clean water from multiple sourcesincluding cooling tower blowdown or service water, misteliminator wash water,and reclaim water system.April 28, 201018KCP&L Iatan Generation StationFGD - AbsorberUnit 1 FGDRecycle PumpsApril 28, 201019KCP&L Iatan Generation StationFGD – Reclaim WaterFGD – Reclaim Water – Units 1 & 2•The reclaim water system stores discharge water from various componentsreducing demand for makeup water for the FGDs.•The reclaimed water comes from:–Filtrate and washwater from gypsum dewatering–Hydrocyclone classifier overflow–Absorber, limestone preparation, andbottom ash storage area sumps–Cooling tower blowdownApril 28, 201020KCP&L Iatan Generation StationFGD – Reclaim WaterReclaim Water TankApril 28, 201021KCP&L Iatan Generation StationFGD – Gypsum DewateringFGD – Gypsum Dewatering – Units 1 & 2•The gypsum dewatering system functions tofilter the gypsum slurry to produce afilter cake that is low in moisture anda filtrate that is re-used in the absorberreclaim water system.•Filter feed tanks feed the tworotary drum vacuum filters.•In the rotary drum vacuum filter a vacuum is applied across the a filter mediaremoving most of the liquid from the slurry leaving the filter cake.•The filter cake is removed from the rotary drum and conveyed to the gypsumstack out conveyors.April 28, 201022KCP&L Iatan Generation StationFGD – Gypsum DewateringRotary DrumVacuum FilterApril 28, 201023KCP&L Iatan Generation StationWater BalanceApril 28, 201024KCP&L Iatan Generation StationZLD – Mechanical DewateringZLD – Mechanical Dewatering – Units 1 & 2•The FGD blowdown is directed from theFGD reclaim tanks to either the ZLDwastewater storage (FGD blowdown)tank or the ZLD backup holding tank.•The wastewater solids are removed inthe metal removal clarifier with theaddition of coagulant andpolyelectrolyte.•The metal removal clarifier sludge is pumpedto the sludge thickener. Liquid fromdecantation in the thickener is directed to the thickener overflow tank.•The solids from the sludge thickener are mixed with a polymer and dewateredwith the belt filter press.•The filter cake from the belt filter press is conveyed to the ZLD cake stack outbuilding and loaded into trucks for disposal in the onsite landfill.•The overflow from the metal removal clarifier is directed to the evaporator feedtank where it is pH adjustedand treated with an anti-scale.April 28, 201025KCP&L Iatan Generation StationZLD – Mechanical DewateringZLD Wastewater Storage (FGD Blowdown) Tank, Metal Removal Clarifier,Waste Brine Holding Tank (left to right)ZLD Backup Holding TankApril 28, 201026KCP&L Iatan Generation StationZLD – Mechanical DewateringZLD Cake Stack Out BuildingZLD Cake Stack Out ConveyorApril 28, 201027KCP&L Iatan Generation StationZLD – EvaporatorZLD – Evaporator – Units 1 & 2•The wastewater from the evaporator feedtank is directed through the distillateheat exchangers and deaerator to the seeded falling film evaporator sump..•The wastewater is recirculated from thesump to the top of the evaporator tubebundle. Anti-foam and caustic injection points are located in this recirculationloop.•A side stream flow through a smallhydrocyclone is used to blowdown theconcentrated waste brine from the evaporator. The overflow is directed to wastebrine holding tanks and ultimately tothe fly ash silo conditioner.April 28, 201028KCP&L Iatan Generation StationZLD – EvaporatorZLD BuildingChemical FeedsEvaporatorFeed Tankand PumpsApril 28, 201029KCP&L Iatan Generation StationZLD – EvaporatorEvaporator Heat ExchangerFalling Film Evaporators

# Attachment 2

Iatan FGD System Process Flow Diagram[ConfidentialBusinessInformationhasbeenremovedfromthisdocument.]

# Attachment 3

Iatan FGD Wastewater Treatment System Process Flow Diagrams[ConfidentialBusinessInformationhasbeenremovedfromthisdocument.]