Food-to-microorganism ratio as a crucial parameter to maximize biochemical methane potential from sugarcane vinasse

García, Oscar Daniel Valmaña; Neto, Ana María Pereira; Domingues, Mércia Regina; Zaiat, Marcelo; Martins, Gilberto

doi:10.1007/s43153-022-00270-2

Cited by 1 publication

(1 citation statement)

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“…These tests measure the maximum experimental potential for converting the organic fraction present in the substrates into CH 4 . Initially, a BMP test to evaluate the viability of CH 4 production from a given substrate is a necessary step before implementing AD on a full scale [14]. Recent studies have evaluated the BMP of the residue co-digestion from 1G and 2G sugarcane biorefineries.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Co-Digestion of Vinasse and Pentose Liquor and the Role of Micronutrients in Methane Production within Sugarcane Biorefineries

Freitas,

Lima,

Volpi

et al. 2023

Methane

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Anaerobic digestion (AD) of residues from integrated first- and second-generation ethanol (1G2G) biorefineries is a sustainable method for energy recovery through biogas production. This study evaluated the co-digestion of 1G vinasse, 2G vinasse and pentose liquor (from the pretreatment of sugarcane bagasse for 2G ethanol production) compared to individual digestions using biochemical methane potential (BMP) assays. The results showed some “key” micronutrients from the substrates that affected methane (CH4) production, while their balance provided by co-digestion achieved high digestibility (95%). High iron (Fe) and nickel (Ni) concentrations, in addition to furfural (0.33 g L−1) in pentose liquor seemed to decrease its CH4 production potential. Despite these adverse effects observed in mono-digestion, co-digestion was beneficial for this substrate, increasing digestibility (52%) and BMP (118%). The highest BMP was observed in vinasse 2G (631 ± 6 NmL CH4 gTVS−1), with no significant difference compared to the adjusted modified Gompertz model (624 ± 10 NmL CH4 gTVS−1). The co-digestion system also presented the highest specific CH4 production rate (20 ± 1 NmL CH4 gTVS−1day−1) and shortened the lag phase by 19% compared to the AD of isolated 1G vinasse with the second lowest BMP value (494 ± 11 NmL CH4 gTVS−1).

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Section: Introductionmentioning

confidence: 99%