BioCon™ - Krüger A/S

BioCon Sludge Drying Solutions

Features and benefitsA BioCon sludge drying plant is especially designed for drying of dewatered sludge frommunicipal and industrial wastewater treatment plants.BioCon sludge drying plants are furthermore CE marked and comply withcurrent EU and national rules, regulations and directives.The BioCon DryerBioCon is a dual-belt low temperature dryer designed to be one of the safest dryers onthe market while maintaining easy and efficient operations.BioCon uses innovative depositors within the dryer to deposit thin strings of dewateredsludge on the first drying belt. The depositor system ensures a large evaporation surfacearea while the circulated drying air evaporates the water from the sludge.BioCon operates with a drying air temperature range from 180 °C on the first belt to 80-100 °C on the end belt. The sludge residence time in the dryer is more than 60 minutesand the dried sludge meets the US EPA requirements for Class A pathogen reduction.►►►►►►►►►►►►►►►►Safe operation due to low dryingtemperature and minimal dustemission.Flexible in regards to energy andheat sourceNo odour release to surroundingsdue to negative pressuredrying air systemDesigned for intermittent as wellas non-stop operationLow operation and maintenancecostsDelivers disinfected and granulateddried biosolids. The endproduct meets the US EPA ClassA requirementsEasily expanded with BioConEnergy Recovery System (BERS)Easily expanded with BioConEnergy Exchange System (BEES)The BioCondrying plant isdesigned for intermittentas well as non-stop operation.The BioCon drying plant is fullymonitored and controlled by thestate of the art Siemens PCS7SCADA system which allowsunattended operation alsooutside normal workinghours.Efficient DryingWithout OdourEnergy is supplied indirectly by a heatexchanger to heat the drying air. A circulationfan provides the necessary air velocityaround the sludge strings to ensure thewater evaporation from the sludge.To remove the moisture and particulatematter from the wet drying air a certainamount of the drying air is taken into thecondensing air loop and sent through thecondenser before returning to the drier.As the entire dryer unit is kept at a lownegative pressure by the vacuum air fanand the drying air as well as the condensingair loops are enclosed cycles the system ensuresan odourless operation.Sludge into the DryerFrom the sludge cake buffer silo any combinationof primary, secondary or digestedsludge is pumped into the BioCon dryer.To ensure effective depositing on the beltthe dried solids content in the dewateredsludge should be between 10% and 30% DS.The BioCon depositor system creates alarge evaporation surface in the sludgestrings which allows the drying process tooperate at:►► Low drying temperature►► Short retention time►► Elimination of back-mixing

Flexible Energy SourcesThe flexible BioCon dryer uses several energysources to provide the needed heatingfluid for the drying air heat exchanger.Heating fluidsThe simple BioCon dryer enables flexibilityin choice of heating fluids as:►► Hot air►► Steam►► Hot oil►► Hot oil / hot waterCombinationsThe simple and flexible BioCon dryeroperates in easy combination with:►► Gas Engine►► Boiler►► Steam Generator►► Air Heater►► BioCon Energy Recovery System(BERS)►► BioCon Energy Exchange System(BEES)BioCon Energy Recovery System( BERS )The BioCon Energy Recovery System (BERS)reduces the total output of the plant to 5-10% of the original sludge cake quantity.BERS provides thermal energy for the dryingprocess. BERS will be self­ sufficient regardingthermal energy at 20-25% DS contentin sludge cake.The BioCon Energy Recovery System includesa movable grate furnace for burning ofthe dried sludge, a heat exchanger for fluegas/drying air and a compact dry flue gastreatment system.The installation for flue gas treatmentconsists of equipment for dosing of bicarbonateand activated carbon and a bag filterfor residuals.BioCon Energy Exchange System( BEES )Sludge digestion combined with the BioConEnergy Exchange System (BEES) provides anessential reduction in the need for externalenergy supply.BEES utilizes the opportunity for energytransfer between the dryer condensingair and the sludge digestion heat system.Frequently sludge digestion and BEES willturn out autothermic.BioCon Energy Recovery System (BERS)BioCon Energy Exchange System (BEES)DewateredSludgeTreatedeffluentDryerCondenserTreatedeffluentreturnHot airCondensateDried sludgeVacuum airDrying airCombustion airFurnaceActive carbon+ BicarbonateAshesFlue gasReactorBagfilterResidualTreatedflue gasStackDewateredSludgeDrying airTreatedeffluentDryerTreatedeffluentreturnCondenserHot airCondensateDried sludgeAir HeaterVacuum airCombustion airEnergy ExchangerPre-thickenedsludgeFlue gasStackBiogasAnaerobicDigesterDigestedsludge todewatering

BioCon Sludge Drying SolutionsSelected Reference Plants1999: Randers WastewaterTreatment Plant, Denmark1,600 tons dry solids per year2003: Mora WastewaterTreatment Plant, Sweden840 tons dry solids per year2006: Haapavesi WastewaterTreatment Plant, Finland1,500 tons dry solids per year2006: Draguignan WastewaterTreatment Plant, France1,638 tons dry solids per year2006: Mystic Lake WastewaterTreatment Plant, USA333 tons dry solids per year2001: Bjergmarken WastewaterTreatment Plant, Roskilde, Denmark1,675 tons dry solids per yearKrüger A/SIndkildevej 6 CDK-9210 Aalborg SØDenmarkPhone: +45 98 18 93 00aalborg@kruger.dkwww.biocon.dkKrüger A/SGladsaxevej 363DK-2860 SøborgDenmarkPhone: +45 39 69 02 22kruger@kruger.dkwww.kruger.dk