Integration of subcritical water pretreatment and anaerobic digestion technologies for valorization of açai processing industries residues

Francisco W. Maciel-Silva, Solange I. Mussatto, Tânia Forster-Carneiro

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The objective of this work was to study the valorization of residual biomass and wastewater from açai fruit processing to obtain energy products and higher added value from such residues, through the integration between subcritical waterpretreatment and anaerobic digestion technologies. Subcritical watertechnology was performed to pretreat the residual biomass. For this process, the reactorwas feed with 5 g of açai residue and a solvent to biomass mass ratio of 80 g of water per gram of açai residue was used. The process was carried out at 170 and 200 °C, during 20 min, using water flow of 20 mL min−1 (15 Mpa system). Then, the residual biomass was submitted to the anaerobic digestion process using a reactor with pretreatment (integration) and a control reactor, both in semi-continuous regime and under mesophilic conditions (35 °C). The açai stone had a high carbohydrate concentration including 43.81% cellulose and 25.89% hemicellulose. For the evaluated conditions, subcritical water pretreatment at 200 °C gave the bestresultsforyield of reducing sugars, total reducing sugars and monosaccharide concentration. Anaerobic digestion experiments resulted in analkalinity between 150 and 1537 mgCaCO3.L−1 for the control reactor and between 249 and 491 mgCaCO3.L−1 for the reactor integration.Acetic acid was the main volatile fatty acid produced in both reactors, but butyric acid also had a very high concentration in the control reactor. The methane composition in the biogas for the integration reactor in the stabilization phase was between 60 and 80%, whilefor the control reactor it was in the range between 40 and 60%.The accumulated biogas yield was 7.79 and 791.81 L.KgTVS−1 for the control and integration reactor, respectively. Anaerobic digestion using the açai hydrolysate obtained by subcritical water pretreatment showed a significant advantage over the control digestion, resulting in30% more methane in the biogas and 100 times higheryield.
Original languageEnglish
JournalJournal of Cleaner Production
Volume228
Pages (from-to)1131-1142
ISSN0959-6526
DOIs
Publication statusPublished - 2019

Keywords

  • Anaerobic digestion
  • Subcritical water pretreatment
  • Methane
  • Biogas
  • Biorefinery

Cite this

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title = "Integration of subcritical water pretreatment and anaerobic digestion technologies for valorization of a{\cc}ai processing industries residues",
abstract = "The objective of this work was to study the valorization of residual biomass and wastewater from a{\cc}ai fruit processing to obtain energy products and higher added value from such residues, through the integration between subcritical waterpretreatment and anaerobic digestion technologies. Subcritical watertechnology was performed to pretreat the residual biomass. For this process, the reactorwas feed with 5 g of a{\cc}ai residue and a solvent to biomass mass ratio of 80 g of water per gram of a{\cc}ai residue was used. The process was carried out at 170 and 200 °C, during 20 min, using water flow of 20 mL min−1 (15 Mpa system). Then, the residual biomass was submitted to the anaerobic digestion process using a reactor with pretreatment (integration) and a control reactor, both in semi-continuous regime and under mesophilic conditions (35 °C). The a{\cc}ai stone had a high carbohydrate concentration including 43.81{\%} cellulose and 25.89{\%} hemicellulose. For the evaluated conditions, subcritical water pretreatment at 200 °C gave the bestresultsforyield of reducing sugars, total reducing sugars and monosaccharide concentration. Anaerobic digestion experiments resulted in analkalinity between 150 and 1537 mgCaCO3.L−1 for the control reactor and between 249 and 491 mgCaCO3.L−1 for the reactor integration.Acetic acid was the main volatile fatty acid produced in both reactors, but butyric acid also had a very high concentration in the control reactor. The methane composition in the biogas for the integration reactor in the stabilization phase was between 60 and 80{\%}, whilefor the control reactor it was in the range between 40 and 60{\%}.The accumulated biogas yield was 7.79 and 791.81 L.KgTVS−1 for the control and integration reactor, respectively. Anaerobic digestion using the a{\cc}ai hydrolysate obtained by subcritical water pretreatment showed a significant advantage over the control digestion, resulting in30{\%} more methane in the biogas and 100 times higheryield.",
keywords = "Anaerobic digestion, Subcritical water pretreatment, Methane, Biogas, Biorefinery",
author = "Maciel-Silva, {Francisco W.} and Mussatto, {Solange I.} and T{\^a}nia Forster-Carneiro",
year = "2019",
doi = "10.1016/j.jclepro.2019.04.362",
language = "English",
volume = "228",
pages = "1131--1142",
journal = "Journal of Cleaner Production",
issn = "0959-6526",
publisher = "Elsevier",

}

Integration of subcritical water pretreatment and anaerobic digestion technologies for valorization of açai processing industries residues. / Maciel-Silva, Francisco W.; Mussatto, Solange I.; Forster-Carneiro, Tânia.

In: Journal of Cleaner Production, Vol. 228, 2019, p. 1131-1142.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Integration of subcritical water pretreatment and anaerobic digestion technologies for valorization of açai processing industries residues

AU - Maciel-Silva, Francisco W.

AU - Mussatto, Solange I.

AU - Forster-Carneiro, Tânia

PY - 2019

Y1 - 2019

N2 - The objective of this work was to study the valorization of residual biomass and wastewater from açai fruit processing to obtain energy products and higher added value from such residues, through the integration between subcritical waterpretreatment and anaerobic digestion technologies. Subcritical watertechnology was performed to pretreat the residual biomass. For this process, the reactorwas feed with 5 g of açai residue and a solvent to biomass mass ratio of 80 g of water per gram of açai residue was used. The process was carried out at 170 and 200 °C, during 20 min, using water flow of 20 mL min−1 (15 Mpa system). Then, the residual biomass was submitted to the anaerobic digestion process using a reactor with pretreatment (integration) and a control reactor, both in semi-continuous regime and under mesophilic conditions (35 °C). The açai stone had a high carbohydrate concentration including 43.81% cellulose and 25.89% hemicellulose. For the evaluated conditions, subcritical water pretreatment at 200 °C gave the bestresultsforyield of reducing sugars, total reducing sugars and monosaccharide concentration. Anaerobic digestion experiments resulted in analkalinity between 150 and 1537 mgCaCO3.L−1 for the control reactor and between 249 and 491 mgCaCO3.L−1 for the reactor integration.Acetic acid was the main volatile fatty acid produced in both reactors, but butyric acid also had a very high concentration in the control reactor. The methane composition in the biogas for the integration reactor in the stabilization phase was between 60 and 80%, whilefor the control reactor it was in the range between 40 and 60%.The accumulated biogas yield was 7.79 and 791.81 L.KgTVS−1 for the control and integration reactor, respectively. Anaerobic digestion using the açai hydrolysate obtained by subcritical water pretreatment showed a significant advantage over the control digestion, resulting in30% more methane in the biogas and 100 times higheryield.

AB - The objective of this work was to study the valorization of residual biomass and wastewater from açai fruit processing to obtain energy products and higher added value from such residues, through the integration between subcritical waterpretreatment and anaerobic digestion technologies. Subcritical watertechnology was performed to pretreat the residual biomass. For this process, the reactorwas feed with 5 g of açai residue and a solvent to biomass mass ratio of 80 g of water per gram of açai residue was used. The process was carried out at 170 and 200 °C, during 20 min, using water flow of 20 mL min−1 (15 Mpa system). Then, the residual biomass was submitted to the anaerobic digestion process using a reactor with pretreatment (integration) and a control reactor, both in semi-continuous regime and under mesophilic conditions (35 °C). The açai stone had a high carbohydrate concentration including 43.81% cellulose and 25.89% hemicellulose. For the evaluated conditions, subcritical water pretreatment at 200 °C gave the bestresultsforyield of reducing sugars, total reducing sugars and monosaccharide concentration. Anaerobic digestion experiments resulted in analkalinity between 150 and 1537 mgCaCO3.L−1 for the control reactor and between 249 and 491 mgCaCO3.L−1 for the reactor integration.Acetic acid was the main volatile fatty acid produced in both reactors, but butyric acid also had a very high concentration in the control reactor. The methane composition in the biogas for the integration reactor in the stabilization phase was between 60 and 80%, whilefor the control reactor it was in the range between 40 and 60%.The accumulated biogas yield was 7.79 and 791.81 L.KgTVS−1 for the control and integration reactor, respectively. Anaerobic digestion using the açai hydrolysate obtained by subcritical water pretreatment showed a significant advantage over the control digestion, resulting in30% more methane in the biogas and 100 times higheryield.

KW - Anaerobic digestion

KW - Subcritical water pretreatment

KW - Methane

KW - Biogas

KW - Biorefinery

U2 - 10.1016/j.jclepro.2019.04.362

DO - 10.1016/j.jclepro.2019.04.362

M3 - Journal article

VL - 228

SP - 1131

EP - 1142

JO - Journal of Cleaner Production

JF - Journal of Cleaner Production

SN - 0959-6526

ER -