Thermophilic anaerobic co-digestion of winery...
Transcript of Thermophilic anaerobic co-digestion of winery...
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Mesophilic and Thermophilic anaerobic co‐digestion of winery wastewater
sludge and wine lees: an integrated approach for wine industry
C. Da Ros1, C. Cavinato1, P. Pavan1, D. Bolzonella2
1Department of Environmental Sciences, Informatics and Statistics, University Ca’Foscari of Venice, Calle Larga Santa Marta 30123 Venice, Italy.
2Department of Biotechnology, University of Verona, Strade le Grazie 15, 37134 Verona, Italy.
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Trends in world wine production: stable production of 270 millions hL per year in the last 15 years
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2014 wine production per country
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2014 wine production per country: Europe leads
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Environmental impacts of wine production ….Waste «pressure» …..
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Wastewater(and then sludge)
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Grape pomaceWastewater
(and then sludge)
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Stalks
Grape pomaceWastewater
(and then sludge)
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Stalks
Lees
Grape pomaceWastewater
(and then sludge)
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Winery Wastes
Grape pomace62%
Lees14%
Stalks12%
Wastewater sludge12%
Ruggieri et al., 2009
Organic waste: 40‐60 kg/hl of wine produced
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Wastewater200‐400 l/hl of wine produced
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Integrated treatment of winery wastesby ANAEROBIC DIGESTION
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Integrated treatment of winery wastesby ANAEROBIC DIGESTION
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Integrated treatment of winery wastesby ANAEROBIC DIGESTION
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VINASSES (AFTER DISTILLATION)
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Why anaerobic digestion ??
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Why anaerobic digestion ??> 8600
14,000 AD plants operating within EUSome 8,000 MW installed powerSome 300 plants for biomethane upgrade
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Why anaerobic digestion ??
Digestate: a renewable fertilizer and carbon sequestrer
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Mesophilic and Thermophilic anaerobicco‐digestion of winery waste and sludge
A pilot scale trial
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Substrates characteristicsParameter Unit Waste Activated Sludge Wine Lees
average std.dev range average std.dev range
TS gTS/kgww 158.9 49.3 22.7‐267.8 62.0 27.9 12.3 ‐120.0
VS gVS/kgww 143.5 41.6 20.7 – 237.3 33.6 15.1 10.3 ‐73.0
VS/TS % 88% 3 79‐ 93% 57% 13% 29 ‐ 86%
COD mg/g TS 868 69.4 749‐1008 559 151 312 – 919
sCOD g/l nd nd nd 167 45 111 ‐204
TKN mg N‐NH4+/g TS 52.7 16.3 14.5 ‐80.3 30.3 12.7 9.7 ‐68.7
NH4+ mg N NH4
+/l nd nd nd 33.9 22.7 6.7 – 95.3
Ptot mg P‐PO43‐/g TS 7.3 2.0 2.5 ‐10.7 6.2 2.9 2.6 ‐ 14.3
Polyphenols mg HGal/l nd nd nd 1537 1189 260‐3,980
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Substrates characteristicsParameter Unit Waste Activated Sludge Wine Lees
average std.dev range average std.dev range
TS gTS/kgww 158.9 49.3 22.7‐267.8 62.0 27.9 12.3 ‐120.0
VS gVS/kgww 143.5 41.6 20.7 – 237.3 33.6 15.1 10.3 ‐73.0
VS/TS % 88% 3 79‐ 93% 57% 13% 29 ‐ 86%
COD mg/g TS 868 69.4 749‐1008 559 151 312 – 919
sCOD g/l nd nd nd 167 45 111 ‐204
TKN mg N‐NH4+/g TS 52.7 16.3 14.5 ‐80.3 30.3 12.7 9.7 ‐68.7
NH4+ mg N NH4
+/l nd nd nd 33.9 22.7 6.7 – 95.3
Ptot mg P‐PO43‐/g TS 7.3 2.0 2.5 ‐10.7 6.2 2.9 2.6 ‐ 14.3
Polyphenols mg HGal/l nd nd nd 1537 1189 260‐3,980
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Pilot scale anaerobic reactors
• Two parallel CSTR reactors• Volume reactors: 230 l• Organic load:
avg 3.2 kgCOD/m3d• HRT: avg 23 d• Temperature:
37°C & 55°C
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Mesophilic process
44,555,566,577,588,59
0
100
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300
400
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600
700
0 100 200 300
pH
N‐NH4+(m
g/l)
time(d)
N‐NH4+ pH
start‐up
0
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0 100 200 300
TS, V
S (g/kg)
time(d)
VS TSstart‐up
0102030405060708090
0 100 200 300
Polyph
enols (mgH
Gal/l)
time(d)
Polyphenols
start‐up
00,050,10,150,20,250,30,350,40,450,5
0 100 200 300
SGP(m3/kgCO
D))
time(d)
SGP
start‐up
Process was stable:pH 7.46 N‐NH4+: 400 mg N‐NH4+VFA < 200 mgCOD/lTotal alkalinity: 2,248 mgCaCO3/l
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Mesophilic process
44,555,566,577,588,59
0
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0 100 200 300
pH
N‐NH4+(m
g/l)
time(d)
N‐NH4+ pH
start‐up
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0 100 200 300
TS, V
S (g/kg)
time(d)
VS TSstart‐up
0102030405060708090
0 100 200 300
Polyph
enols (mgH
Gal/l)
time(d)
Polyphenols
start‐up
00,050,10,150,20,250,30,350,40,450,5
0 100 200 300
SGP(m3/kgCO
D))
time(d)
SGP
start‐up
Improve of degradation efficiencies in the long period:
Biomass acclimatation
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Mesophilic process
44,555,566,577,588,59
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0 100 200 300
pH
N‐NH4+(m
g/l)
time(d)
N‐NH4+ pH
start‐up
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0 100 200 300
TS, V
S (g/kg)
time(d)
VS TSstart‐up
0102030405060708090
0 100 200 300
Polyph
enols (mgH
Gal/l)
time(d)
Polyphenols
start‐up
00,050,10,150,20,250,30,350,40,450,5
0 100 200 300
SGP(m3/kgCO
D))
time(d)
SGP
start‐up
Average biogas producton: 0.39 m3/kgCOD
with 64‐73% of methane
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Thermophilic process
4
4,5
55,5
6
6,57
7,5
88,5
9
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0 50 100
pH
N‐NH4+(m
g/l)
time(d)
N‐NH4+
pH
start‐up
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0,150,2
0,250,3
0,350,4
0,450,5
0 20 40 60 80 100 120 140
SGP(m3/kgCO
D)
time(d)
SGP
start‐up
Volatile fatty acids accumulated (6 gCOD/l)VFAs in the bulk were composed mainly by acetic andpropionic acids (78% and 10% respectively)pH fell down to 5.3Specific gas production and methane content reduced
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Was methanogenic activity inhibited by missing trace elements?
Takashimaiet al., 2011
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Different addition of trace elements in the feed mixture
RUN 0 RUN 1 RUN 2 RUN 3 RUN 4
Fe (mg/l) 0 4.3 3.01 2.15 0.86
Ni (mg/l) 0 0.46 0.32 0.23 0.09
Co (mg/l) 0 0.51 0.36 0.25 0.10
Values suggested by Takashima et al., 2011REFERENCE VALUE
70% of REFERENCE VALUE
50% of REFERENCE VALUE
20% of REFERENCE VALUE
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Specific biogas production
00,10,20,30,40,50,60,70,80,91
0 100 200 300 400
SGP (m
3/kgCO
D)
time (days)55°C AVERAGE 37°C
start‐upRUN0
2°start‐up
RUN3RUN2
RUN1
RUN4
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Comparison of operational conditionsParameter Unit 37°C
55°C
RUN0 RUN1 RUN2 RUN3 RUN4
Stability parameters
pH ‐ 7.38 6.7 7.91 7.78 7.82 7.9
TA mg CaCO3/l 2287 3673 3390 2439 3062 3023
N‐NH4+ mg N‐NH4
+/l 373 820 630 455 665 644
Digestate characteristics
TS gTS/kgww 24.7 31.9 21.3 19.8 22.1 20.3
VS gVS/kgww 14.3 19.5 12.1 13.3 11.6 11.5
VS/TS % 58 61 57 67 52 61
COD mg COD/gTS 614 671 613 680 602 556
sCOD mg COD/l 391 5394 852 740 870 882
TKN mg N‐NH4+/gTS 37.9 40.4 32.8 35.9 37.6 33.1
Ptot mg P‐PO43‐/gTS 8 11.1 10.2 11.3 9.8 8.5
Polyphenols mg HGal/l 26 153 66 61 57 ‐
Yields
SGP m3/kgCOD 0.386 0.390 0.454 0.386 0.381 0.347
COD removal % 79% ‐ 88% 73% 70% 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
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Digestate dewaterability:mesophilic & thermophilic with maximum metal augmentation
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conditioner dose (g/kgTS)
37°C 55°c meccanically filtrable
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0 2 4 6 8 10
SRF (x10
12 m
/kg)
conditioner dose (g/kgTS)
37°C 55°C meccanically filtrable
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Final remarks• Winery waste sludge and wine lees could be easily co‐treated by mesophilic anaerobic digestion (SGP: 0.39 m3/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 thatmesophilicdigestate performed better
• Higher costs for metals and flocculants for thermoAD should be kept in mind !
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Organised by the Specialist Group on Winery Waste Management of the International Water Assocition