Could pyrolysis substitute hydrolysis in 2nd generation biomass valorization strategies? A chemical oxygen demand (COD) approach

Torri, Cristian; Favaro, Lorenzo; Facchin, Andrea; Küçükağa, Yusuf; Rombolà, Alessandro G.; Fabbri, Daniele

doi:10.1016/j.jaap.2022.105467

Cited by 6 publications

(2 citation statements)

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“…4 Summing up all bioavailable constituents of PyP, namely, gas (raw gas or syngas) and WS fraction, pyrolysis can deliver more than half of the chemical energy of a biomass, providing a performance that is better than what can be obtained by means of hydrolysis-based scheme. 5 Syngas is biodegradable and can be converted anaerobically to various target chemicals like hydrogen, alcohols and VFAs. 6 The main issue related to syngas conversion is the low water solubility of CO and H 2 as well as the eventual presence of highly toxic contaminants (e.g., hydrogen cyanide or NO x ), 7 which are typically more relevant for gasification-derived syngas.…”

Section: Introductionmentioning

confidence: 99%

“…Summing up all bioavailable constituents of PyP, namely, gas (raw gas or syngas) and WS fraction, pyrolysis can deliver more than half of the chemical energy of a biomass, providing a performance that is better than what can be obtained by means of hydrolysis-based scheme . Syngas is biodegradable and can be converted anaerobically to various target chemicals like hydrogen, alcohols and VFAs .…”

Section: Introductionmentioning

confidence: 99%

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

Küçükağa

Facchin

Kara

et al. 2022

Ind. Eng. Chem. Res.

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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).

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