Abstract
A new biorefinery conceptual process is proposed for biohydrogen and biomethane production from a combination of fruits and vegetable wastes (FVW) and corn stover (CS). The objective of this work was to perform the acid hydrolysis (HCl 0.5% v/v, 120 °C, 2 h) of the FVW and CS at 3:1 dry basis ratio, and to process its main physical phases, liquid hydrolyzates (LH) and hydrolyzed solids (HS), by mesophilic dark fermentation (DF) and anaerobic digestion (AD), respectively. In DF of LH as carbon source, hydrogen was produced at maximum rate of 2.6 mL H2/(gglucose h) and maximum accumulation of 223.8 mL H2/gglucose, equivalent to 2 mol H2/molglucose, in a butyric-pathway-driven fermentation. HS were digested to methane production assessing inoculum to substrate ratios in the range 2–4 ginoculum/gVS. The main results in AD were 14 mmol CH4/gvs. The biorefinery demonstrated the feasibility to integrate the acid hydrolysis as pretreatment and subsequently use the LH for hydrogen production, and the HS for methane production, with an energy yield recovery of 9.7 kJ/gvs, being the energy contribution from anaerobic digestion 8-fold higher than of dark fermentation.
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Abbreviations
- AD:
-
anaerobic digestion
- B(t) :
-
cumulative methane production (mmol CH4)
- B max :
-
maximum cumulative methane production (mmol CH4)
- b(t) :
-
cumulative specific methane production (mmol CH4/gvs)
- b max :
-
maximum cumulative specific methane production (mmol CH4/gvs)
- CS:
-
corn stover
- C RS,0 :
-
initial reducing sugars concentration (g/L)
- C RS,f :
-
final reducing sugars concentration (g/L)
- DF:
-
dark fermentation
- e :
-
Euler number (2.718)
- Ê p :
-
specific gross energy potential (kJ/gvs)
- FVW:
-
fruit and vegetable wastes
- h :
-
diluted acid pretreatment stage
- H :
-
hydrogen production stage by DF
- H(t) :
-
cumulative hydrogen specific production (mL H2/gglucose)
- H max :
-
maximum cumulative specific hydrogen production (mL H2/gglucose)
- h-H-M :
-
biorefinery model
- HHV H2 :
-
high hydrogen heating value (282.8 kJ/mol)
- HHV CH4 :
-
high methane heating value (889.9 kJ/mol)
- HMF:
-
5-hydroxymethylfurfural
- HS:
-
hydrolyzed solids
- ISR:
-
inoculum to substrate ratio
- k :
-
methane production rate (1/day)
- LH:
-
liquid hydrolyzates
- M :
-
methane production stage by AD
- MW glucose :
-
glucose molar weight (180.16 g/mol)
- ND:
-
not determined
- pH0 :
-
initial pH
- r max,M :
-
maximum specific methane production rate (mmol/(gvs day))
- r max,H :
-
maximum specific hydrogen production rate (mL/(gglucose h)),
- R max,M :
-
maximum methane production rate (mmol/day)
- R 2 :
-
coefficient of determination
- RS:
-
reducing sugars
- T :
-
operational temperature
- t :
-
time
- TPC:
-
total phenolic compounds
- TS:
-
total solids
- TVFA:
-
total volatile fatty acids
- V M :
-
molar volume at standard conditions (22.4 L/mol H2 or CH4)
- V O :
-
operational volume
- VS:
-
volatile solids
- Y’ H2 :
-
hydrogen molar pseudoyield (mol H2/molglucose)
- db:
-
dry basis
- wb:
-
wet basis
- λ :
-
adaptation time (h or day)
- η AH :
-
acid hydrolysis efficiency (gglucose/gvs)
- η DF :
-
dark fermentation efficiency (gvs consumed/gvs added)
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Funding
The authors express their gratitude to the Directive Board of the Chemical Sciences Faculty of the Universidad Autónoma de Nuevo León for supporting the project (02-106534-PST-15/123). Santiago Rodríguez-Valderrama thanks Consejo Nacional de Ciencia y Tecnología (Conacyt) for the Scholarship No. 714579.
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Rodríguez-Valderrama, S., Escamilla-Alvarado, C., Rivas-García, P. et al. Biorefinery concept comprising acid hydrolysis, dark fermentation, and anaerobic digestion for co-processing of fruit and vegetable wastes and corn stover. Environ Sci Pollut Res 27, 28585–28596 (2020). https://doi.org/10.1007/s11356-020-08580-z
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DOI: https://doi.org/10.1007/s11356-020-08580-z