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Biorefinery concept comprising acid hydrolysis, dark fermentation, and anaerobic digestion for co-processing of fruit and vegetable wastes and corn stover

  • Advances in Environmental Biotechnology and Engineering 2018
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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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Correspondence to Carlos Escamilla-Alvarado.

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Responsible editor: Ta Yeong Wu

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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

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