The coupling of pyrolysis and acidogenic fermentation was here proposed as a new hybrid thermochemical-biological method to circumvent the hydrolysis bottleneck within lignocellulose valorization schemes. Pyrolysis products of fir sawdust, that is, the water-soluble (WS) fraction together with CO-rich syngas, were tested as feedstock for volatile fatty acid (VFA) production. WS/syngas conversion to VFA was particularly challenging due to the combined effect of the substrate (WS/syngas) and product (VFA) inhibition. To solve such an issue, a new type of bioreactor, based on packed biochar and a new acclimatization/bioaugmentation procedure consisting of co-feeding WS/syngas and glucose were developed and tested. The gradual switch from glucose to WS was monitored through various analytical techniques, observing the transition toward a “pyrotrophic” microbial mixed culture able to convert WS/syngas into VFA. Even without selective inhibition of methanogens, the main fermentation products were VFA (mainly acetic, butyric, and caproic acid), whose profile was a function of the WS/glucose ratio. Although the achieved volumetric productivity was lower (<0.6 gCOD L–1 d–1) than that observed in sugar fermentation, bioaugmented pyrotrophs could convert headspace CO, most of GC–MS detectable compounds (e.g., anhydrosugars), and a significant portion of non-GC–MS detectable compounds of WS (e.g., oligomers with MW < 1.45 kDa).

Conversion of Pyrolysis Products into Volatile Fatty Acids with a Biochar-Packed Anaerobic Bioreactor / Küçükağa, Yusuf; Facchin, Andrea; Kara, Serdar; Nayır, Tülin Yılmaz; Scicchitano, Daniel; Rampelli, Simone; Candela, Marco; Torri, Cristian. - In: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH. - ISSN 0888-5885. - ELETTRONICO. - 61:45(2022), pp. 16624-16634. [10.1021/acs.iecr.2c02810]

Conversion of Pyrolysis Products into Volatile Fatty Acids with a Biochar-Packed Anaerobic Bioreactor

Küçükağa, Yusuf;Facchin, Andrea;Scicchitano, Daniel;Rampelli, Simone;Candela, Marco;Torri, Cristian
2022

Abstract

The coupling of pyrolysis and acidogenic fermentation was here proposed as a new hybrid thermochemical-biological method to circumvent the hydrolysis bottleneck within lignocellulose valorization schemes. Pyrolysis products of fir sawdust, that is, the water-soluble (WS) fraction together with CO-rich syngas, were tested as feedstock for volatile fatty acid (VFA) production. WS/syngas conversion to VFA was particularly challenging due to the combined effect of the substrate (WS/syngas) and product (VFA) inhibition. To solve such an issue, a new type of bioreactor, based on packed biochar and a new acclimatization/bioaugmentation procedure consisting of co-feeding WS/syngas and glucose were developed and tested. The gradual switch from glucose to WS was monitored through various analytical techniques, observing the transition toward a “pyrotrophic” microbial mixed culture able to convert WS/syngas into VFA. Even without selective inhibition of methanogens, the main fermentation products were VFA (mainly acetic, butyric, and caproic acid), whose profile was a function of the WS/glucose ratio. Although the achieved volumetric productivity was lower (<0.6 gCOD L–1 d–1) than that observed in sugar fermentation, bioaugmented pyrotrophs could convert headspace CO, most of GC–MS detectable compounds (e.g., anhydrosugars), and a significant portion of non-GC–MS detectable compounds of WS (e.g., oligomers with MW < 1.45 kDa).
2022
Conversion of Pyrolysis Products into Volatile Fatty Acids with a Biochar-Packed Anaerobic Bioreactor / Küçükağa, Yusuf; Facchin, Andrea; Kara, Serdar; Nayır, Tülin Yılmaz; Scicchitano, Daniel; Rampelli, Simone; Candela, Marco; Torri, Cristian. - In: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH. - ISSN 0888-5885. - ELETTRONICO. - 61:45(2022), pp. 16624-16634. [10.1021/acs.iecr.2c02810]
Küçükağa, Yusuf; Facchin, Andrea; Kara, Serdar; Nayır, Tülin Yılmaz; Scicchitano, Daniel; Rampelli, Simone; Candela, Marco; Torri, Cristian
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/903972
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