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CORFU2022ANAEROBIC CO-DIGESTION OF AGRICULTURALRESIDUES PRODUCED IN SOUTHERN GREECEDURING SPRING/SUMMER SEASONVasiliki P. Aravani1, Konstantina Tsigkou2, Michael Kornaros3, Vagelis G. Papadakis41EnvironmentalEngineer, PhD Candidate, Department of Environmental Engineering, University of Patras, Greece2Chemist, PhD in Chemical Engineering, Department of Chemical Engineering, University of Patras, Greece3Professor, Department of Chemical Engineering, University of Patras, Greece4Professor, Department of Environmental Engineering, University of Patras, Greece9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, Greece
CORFU2022INTRODUCTIONIncreasing of energy utilization by using conventional fuelsrenewable energy sourcessuch as biomassDriven attention ofenergy productionviaCrop residuesAnimal manureGreece: high biomass potentialAgro-industrialresiduesAnaerobic digestion (AD) is one of the most environmentally friendlytechnologies, able to convert organic wastes to valuable energy sources.9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, Greece
AIM OF THE STUDYAD: well-known biological processthat has been investigated forfew decadesCORFU2022Greece: lack of experimentalknowledge on the valorizationof locally available substratesperformance of anaerobic co-digestion experiments in lab-scale valorizingthe optimum Southern Greece spring/summer mixture that resulted fromconducting Biochemical Methane Potential Assays (BMP) in previous study ofour research team9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, Greece
CORFU2022MATERIALS AND METHODS (1/2)BMPBiogas volumemeasurement bysyringeBiogas compositionanalysis by GCCollectionof thesamplesFrom the region of WesternGreece. Storage at the freezerat -18 C.Thermostatic bathConstant agitationdeveloped to determine the maximum methanepotential of a given organic substrate during itsanaerobic decompositionThe anaerobic sludge, which was used as inoculum for the experiments, was obtainedfrom a biogas plant in Messolonghi (Western Greece).9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, Greece
MATERIALS AND METHODS (2/2)CORFU2022Southern Greece(spring/summer)10%14%10%66%Feedstock:4 times per dayDetermination:pH, alkalinity,TS, VS, TSS, VSS,COD, CH, VFA,CH4, biogasThe biogas composition analysis was determined by a gas chromatographer with a thermal conductivitydetector (TCD), while the physicochemical parameters were measured according to the “Standard Methodsfor the Examination of Water and Wastewater”.9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, Greece
PERFORMANCE OF ANAEROBIC CO-DIGESTIONREACTOR One mesophilic single-stage continuous anaerobicdigestion system with operational volume of 0.75 L Initial hydraulic retention time (HRT): 20 days Tested organic loading rate (OLR): 2-7 g COD/(L·d) The OLR was further increased after the system reachedsteady state conditions After reaching the maximum OLR, the HRT was reduced9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, GreeceCORFU2022
CORFU2022MIXTURE (FEEDSTOCK) CHARACTERISTICSOLR(g CH (gCOD/L)TKN(g/L)Proteins(g/L)NH3-N(g/L)Fats andoils 8.2281.9291.1865.092.0813.020.352.102.070.285 .6016.280.442.632.590.359th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, Greece
CORFU2022RESULTS (1/4)pH9OLR: 22.5Alkalinity344512770008.5acetic acid (mg/L)iso-butyric acid (mg/L)iso-valeric acid (mg/L)OLR: 21082.5propionic acid (mg/L)butyric acid (mg/L)valeric acid (mg/L)3445787pH6.56645.5525000VFAs (mg/L)7.5Alkalinity (gCaCO3/L)600040003000200010004.540050100150Time (d)9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, Greece2002500050100150Time (d)200250
CORFU2022RESULTS (2/4)Feed d-COD120OLR: 2Feed t-COD2.53Effluent t-COD4Effluent d-COD45Feed807Feed dissolvedOLR: 22.5Effluent total34Effluent dissolved4577010060Carbohydrates (g/L)COD (g/L)80604050403020201000050100Time (d)9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, Greece150200250050100Time (d)150200250
CORFU2022RESULTS (3/4)Feed TS140OLR: 2Feed VS2.53Effluent TS4Effluent VS45Biogas47OLR: 2Methane2.53LCH4/g COD in445373.51202.5322.5TS, VS (g/L)806021.51.5401200.500050100Time (d)9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, Greece15020025010.50050100150Time (d)200250L CH4/g COD inBiogas, CH4 STP (L)100
CORFU2022RESULTS (4/4)RunSouthern Greece(spring/summer)OLR (g COD/(L·d))5HRT (d)20pH7.61 0.22t-COD Removal (%)63.93 1.60t-CH Removal (%)91.79 1.34CH4 in Biogas (%)54.86 1.96L CH4/(LR·d)2.12 0.19L biogas/(LR·d)3.85 0.269th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, GreeceMean values ofthe optimumscenario of themethanogenicreactor
CONCLUSIONSCORFU2022 The reactor operated successfully at OLR 2, 2.5, 3, 4 and 5 g COD/(L·d). At OLR 7 g COD/(L·d) and HRT 15 d VFA accumulation and pH decrease ( 7)were observed resulting to methane production drop. The system’s efficient operation paved the way for residual biomasstreatment in single one-stage reactors, without substrate dilution, at highOLRs.9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, Greece
FUTURE WORK Comparison of experimental results with predictions of mathematicalmodel of anaerobic digestion Life Cycle Assessment (LCA) of the process Technoeconomic analysis9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, GreeceCORFU2022
AKNOWLEDGEMENTSCORFU2022 This work has derived and financed from project SYNAGRON, a jointRT&D project under Greece – China Call for Proposals launched under theauspices of the Ministry of Science and Technology (MOST) of the People'sRepublic of China and the Ministry of Development & Investments/General Secretariat of Research and Technology (GSRT) of the HellenicRepublic. Takes place at the Laboratory of Biochemical Engineering andEnvironmental Technology at University of Patras9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, Greece
CORFU2022THANK YOU FOR YOURATTENTIONContact email: vasiliki.arav@gmail.com9th International Conference on Sustainable Solid Waste Management15-18 June 2022, Corfu, Greece
CORFU2022 9th International Conference on Sustainable Solid Waste Management 15-18 June 2022, Corfu, Greece PERFORMANCE OF ANAEROBIC CO-DIGESTION REACTOR One mesophilic single-stage continuous anaerobic digestion system with operational volume of 0.75 L Initial hydraulic retention time (HRT): 20 days Tested organic loading rate (OLR): 2-7 g COD/(L·d)
