Mesophilic and Thermophilic anaerobic co digestion of winery wastewater sludge and wine lees: an integrated approach for wine industry
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1 Mesophilic and Thermophilic anaerobic co digestion of winery wastewater sludge and wine lees: an integrated approach for wine industry C. Da Ros 1, C. Cavinato 1, P. Pavan 1, D. Bolzonella 2 1 Department of Environmental Sciences, Informatics and Statistics, University Ca Foscari of Venice, Calle Larga Santa Marta 3123 Venice, Italy. 2 Department of Biotechnology, University of Verona, Strade le Grazie 15, Verona, Italy. 1
2 Trends in world wine production: stable production of 27 millions hl per year in the last 15 years 2
3 214 wine production per country 3
4 214 wine production per country: Europe leads 4
5 Environmental impacts of wine production. Waste «pressure».. 5
6 Wastewater (and then sludge) 6
7 Wastewater (and then sludge) Grape pomace
8 Wastewater (and then sludge) Grape pomace Stalks 8
9 Wastewater (and then sludge) Grape pomace Stalks Lees 9
10 Winery Wastes Wastewater 2 4 l/hl of wine produced Organic waste: 4 6 kg/hl of wine produced Stalks 12% Lees 14% Wastewater sludge 12% Grape pomace 62% Ruggieri et al., 29 1
11 Integrated treatment of winery wastes by ANAEROBIC DIGESTION 11
12 Integrated treatment of winery wastes by ANAEROBIC DIGESTION 12
13 Integrated treatment of winery wastes by ANAEROBIC DIGESTION VINASSES (AFTER DISTILLATION) 13
14 Why anaerobic digestion?? 14
15 Why anaerobic digestion?? > 86 14, AD plants operating within EU Some 8, MW installed power Some 3 plants for biomethane upgrade 15
16 Why anaerobic digestion?? Digestate: a renewable fertilizer and carbon sequestrer 16
17 Mesophilic and Thermophilic anaerobic co digestion of winery waste and sludge A pilot scale trial 17
18 Substrates characteristics Parameter Unit Waste Activated Sludge Wine Lees average std.dev range average std.dev range TS gts/kg ww VS gvs/kg ww VS/TS % 88% % 57% 13% 29 86% COD mg/g TS scod g/l nd nd nd TKN mg N NH 4+ /g TS NH + 4 mg N NH 4+ /l nd nd nd P tot mg P PO 3 4 /g TS Polyphenols mg HGal/l nd nd nd ,98 18
19 Substrates characteristics Parameter Unit Waste Activated Sludge Wine Lees average std.dev range average std.dev range TS gts/kg ww VS gvs/kg ww VS/TS % 88% % 57% 13% 29 86% COD mg/g TS scod g/l nd nd nd TKN mg N NH 4+ /g TS NH + 4 mg N NH 4+ /l nd nd nd P tot mg P PO 3 4 /g TS Polyphenols mg HGal/l nd nd nd ,98 19
20 Pilot scale anaerobic reactors Two parallel CSTR reactors Volume reactors: 23 l Organic load: avg 3.2 kgcod/m 3 d HRT: avg 23 d Temperature: 37 C & 55 C 2
21 Mesophilic process N NH4+(mg/l) N NH4+ ph time(d) 9 8,5 8 7,5 7 6,5 6 5,5 5 4,5 4 ph Process 35 was stable: ph N NH4+: 4 mg N NH4+ 2 TS, VS (g/kg) VFA < 2 mgcod/l 15 Total alkalinity: 2,248 mgcaco3/l 1 VS TS time(d) Polyphenols (mghgal/l) Polyphenols time(d) SGP(m3/kgCOD)),5,45,4,35,3,25,2,15,1,5 SGP time(d) 21
22 Mesophilic process N NH4+(mg/l) Improve of degradation efficiencies in the long period: Biomass acclimatation 1 N NH4+ ph time(d) 9 8,5 8 7,5 7 6,5 6 5,5 5 4,5 4 ph TS, VS (g/kg) VS TS time(d) Polyphenols (mghgal/l) Polyphenols time(d) SGP(m3/kgCOD)),5,45,4,35,3,25,2,15,1,5 SGP time(d) 22
23 Mesophilic process N NH4+(mg/l) N NH4+ ph time(d) 9 8,5 8 7,5 7 6,5 6 5,5 5 4,5 4 ph TS, VS (g/kg) VS TS time(d) Polyphenols (mghgal/l) Polyphenols Average biogas producton:.39 m 3 /kgcod with 64 73% of methane time(d) SGP(m3/kgCOD)),5,45,4,35,3,25,2,15,1,5 SGP time(d) 23
24 Thermophilic process N NH4+(mg/l) time(d) N NH4+ ph 9 8,5 8 7,5 7 6,5 6 5,5 5 4,5 4 ph SGP(m3/kgCOD),5,45,4,35,3,25,2,15,1,5 SGP time(d) Volatile fatty acids accumulated (6 gcod/l) VFAs in the bulk were composed mainly by acetic and propionic acids (78% and 1% respectively) ph fell down to 5.3 Specific gas production and methane content reduced 24
25 Was methanogenic activity inhibited by missing trace elements? Takashimaiet al.,
26 Different addition of trace elements in the feed mixture RUN RUN 1 RUN 2 RUN 3 RUN 4 Fe (mg/l) Ni (mg/l) Co (mg/l) Values suggested by Takashima et al., 211 7% of 5% of 2% of REFERENCE VALUE REFERENCE VALUE REFERENCE REFERENCE VALUE VALUE 26
27 Specific biogas production SGP (m3/kgcod) 1,9,8,7,6,5,4,3,2,1 RUN 2 RUN1 RUN3 RUN2 RUN time (days) 55 C AVERAGE 37 C 27
28 Comparison of operational conditions 55 C Parameter Unit 37 C RUN RUN1 RUN2 RUN3 RUN4 Stability parameters ph TA mg CaCO 3 /l N NH + 4 mg N NH 4+ /l Digestate characteristics TS gts/kg ww VS gvs/kg ww VS/TS % COD mg COD/gTS scod mg COD/l TKN mg N NH 4+ /gts P tot mg P PO 3 4 /gts Polyphenols mg HGal/l Yields SGP m 3 /kgcod COD removal % 79% 88% 73% 7% 65% Stability parameter in the optimal range for anaerobic digestion Higher polyphenols removal with metals adition Highest dosage of metals improved biogas prodcution in comparison with mesophilic process 28
29 Digestate dewaterability: mesophilic & thermophilic with maximum metal augmentation 3 1 CST (s) SRF (x112 m/kg) conditioner dose (g/kgts) conditioner dose (g/kgts) 37 C 55 c meccanically filtrable 37 C 55 C meccanically filtrable 29
30 Final remarks Winery waste sludge and wine lees could be easily co treated by mesophilic anaerobic digestion (SGP:.39 m 3 /kgcod) Thermophilic digestion showed instability, with accumulation of acetic and propionic acids and methanogenic inhibition Addition of trace elements (Fe, Co and Ni) in thermophilic reactor improved process stability Dewaterability tests showed that mesophilic digestate performed better Higher costs for metals and flocculants for thermo AD should be kept in mind! 3
31 Organised by the Specialist Group on Winery Waste Management of the International Water Assocition 31
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