Processflow;sludgetobiogasSludgepumpsM3/hmeteringWastewaterHeatedAnaerobicdigesterNotheatedAnaerobicdigesterPresettlerGasinlet(toactivesystem)GasreservoirSludgeWaterExampleofGastankExampleofanaerobicdigester(2x)WastewatertreamentplantNetherlandsProcessflow;SludgeheatingBlowinbiogasTobeheatedsludgeBiogasHeaterGascompressorSludgepumpHeatexchangerHeatwaterpumpHe...