Improvement of anaerobic digestion of the organic part of landfilled wastes. Ph. Dzaomuho 1*, R. Kinet 1#, S. Hiligsmann 2, P. Thonart 1,2, F. Delvigne.

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Improvement of anaerobic digestion of the organic part of landfilled wastes. Ph. Dzaomuho 1*, R. Kinet 1#, S. Hiligsmann 2, P. Thonart 1,2, F. Delvigne 1 1 ULg – Gembloux Agro-Bio Tech, Microbial Processes and Interactions. Passage des Déportés, 2, Gembloux, B-5030, Belgium. *corresponding author: # founded by 2 Ulg – Service de Technologie microbienne, Boulevard du Rectorat 29, Liège, B-4000, Belgium Context and objectives  Isolated consortium improves anaerobic digestion of landfilled wastes (organic part) when added to leachate.  Cytometry fingerprinting as an efficient and rapid tool for population dynamics identification. These works fit in GreenWin project ‘‘Minerve’’ funded by Région Wallonne of Belgium. Waste samples, leachate and in situ data come from landfill site of Mont-Saint-Guibert in Belgium managed by Shanks SA. Kinet, R., et al., Thermophilic and cellulolytic consortium isolated from composting plants improves anaerobic digestion of cellulosic biomass: Toward a microbial resource management approach. Bioresour. Technol. 189, 138–144. doi: /j.biortech Impact of cellulolytic microbial consortium on wastes digestion (lab scale) Method Hydrolysis of lignocellulosic biomass = Limiting step Addition of an anaerobic hydrolytic consortium to recirculated leachate to improve biodegradation processes  Enrichment method: -Compost as microbial source (10%) -Anaerobia, 55°C, static -Filter paper 1% (w/v)  Degradation potential : -Filter paper  10g/l -Microcrystalline cellulose  10g/l Results Figure 1 : Evolution of maximal total biogas production (ml/g cellulose) during anaerobic and mesophilic (30°C) digestion of a cellulosic substrate (10 g/l filter paper) by (1) leachate microflora (10% v/v), (2) isolated consortium (10% v/v) and (3) mix 1:1 of leachate and isolated consortium (10% v/v). Figure 2 : Evolution of maximal total biogas production (ml/g cellulose) during anaerobic and thermophilic (55°C) digestion of a cellulosic substrate (10 g/l filter paper) by (1) leachate microflora (10% v/v), (2) isolated consortium (10% v/v) and (3) mix 1:1 of leachate and isolated consortium (10% v/v).  Isolated consortium shows efficient cellulolytic activities in both mesophilic and thermophilic conditions.  Leachate presents an absence of cellulolytic activity in mesophilic conditions >< thermophilic conditions  Isolated consortium improves anaerobic digestion of wastes in thermophilic and mesophilic conditions.  Full scale experiment in progress  Mesophilic conditions  Thermophilic conditions Figure 3 : Evolution of maximal total biogas production (ml/g cellulose) during anaerobic and mesophilic (30°C) digestion of organic part from landfilled wastes (10 g/l) by (1) leachate microflora (10% v/v), (2) isolated consortium (10% v/v) and (3) mix 1:1 of leachate and isolated consortium (10% v/v).  Microbial community structure Figure 5 Evolution of microbial populations (cytometry analysis) during anaerobic and thermophilic (55°C) digestion of organic part from landfilled wastes (10 g/l) by (1) leachate microflora (10% v/v), (2) isolated consortium (10% v/v) and (3) mix 1:1 of leachate and isolated consortium (10% v/v) Conclusions Step 1 : Consortium isolation (Kinet et al., 2015) Compost Selective medium Step 2 : BMP testStep 3 : Scale-up productionStep 4 : Full scale application  Experimental conditions: -Consortium, leachate or mix 1:1 as inoculum -Anaerobia, 55°C or 30°C, static -Excavated wastes as substrate 1% (w/v)  Experimental conditions: -Liquid phase = water -100 kg compsot -Recirculation flow = 1L.sec -1 -Extraction time = 1h pump Recirculation loop 500L vessel Metallic cage  Cytometry fingerprinting allows (1) statistical sorting of complex microbial populations and (2) identification of population dynamics  Mix samples population evolves in same way than isolated consortium population  consortium population overrides leachates microflora during cellulose digestion Figure 4 : Evolution of maximal total biogas production (ml/g cellulose) during anaerobic and thermophilic (55°C) digestion of organic part from landfilled wastes (10 g/l) by (1) leachate microflora (10% v/v), (2) isolated consortium (10% v/v) and (3) mix 1:1 of leachate and isolated consortium (10% v/v). T0 cons. T0 leach. T1 cons. T1 leach. T2 cons.T2 leach. T3 cons. T3 leach. T4 cons. T4 leach. T0 mix T1 mix T2 mix T3 mix T4 mix 58% 22% Space modelization (FlowFP R package) Samples Fingerprinting (FlowFP R package) PCA  Punctual injection of leachate with added consortium