Impact of operational conditions on development of the hydrogen-producing microbial consortium in an AnSBBR from cassava wastewater rich in lactic acid

Andreani, Cristiane Lurdes; Tonello, Tamiris Uana; Mari, Ângelo Gabriel; Leite, Luana C.C.; Campaña, Horacio; Lopes, Deize Dias; Rodrigues, José Alberto Domingues; Gomes, Simone D.

doi:10.1016/j.ijhydene.2018.11.155

Cited by 32 publications

(20 citation statements)

References 52 publications

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“…Those high concentrations of lactate and acetate are suggestive of heterolactic fermentation, which would happen during the collection, handling, or even storage of the TV. Indeed, earlier reports have shown diverse feedstocks with high concentrations of lactate and acetate [47][48][49]. In the literature, the presence of LAB in DF is a cause of controversy due to its different effects on hydrogen production [10,50,51].…”

Section: Effect Of the Inoculum Type On The Metabolic Profilesmentioning

confidence: 99%

Dark Fermentation Process Response to the Use of Undiluted Tequila Vinasse without Nutrient Supplementation

et al. 2021

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The technical feasibility of valorizing tequila vinasse (TV), a wastewater with high pollution potential, through the production of biogenic hydrogen via dark fermentation, has long been proven in diverse lab-scale reactors that were operated either in batch or continuous mode. However, such systems have mainly been tested with diluted streams and nutrient supplementation, hindering the techno-economic attractiveness of the TV-to-hydrogen concept at large scale. In this study, the feasibility of producing hydrogen from high-strength undiluted TV with no added extra nutrients was evaluated under batch mesophilic conditions. Additionally, the use of two different acidogenic inocula obtained either by heat or heat-aeration pretreatment was investigated to get a greater understanding of the effect of inoculum type on the process. The results obtained showed that the TV utilized herein contained macro- and micro-nutrients high enough to support the hydrogenogenic activity of both cultures, entailing average hydrogen yields of 2.4–2.6 NL H2/L vinasse and maximum hydrogen production rates of 1.4–1.9 NL H2/L-d. Interestingly, the consumption of lactate and acetate with the concomitant production of butyrate was observed as the main hydrogen-producing route regardless of the inoculum, pointing out the relevance of the lactate-driven dark fermentative process. Clostridium beijerinckii was ascertained as key bacteria, but only in association with microorganisms belonging to the genera Enterobacter and Klebsiella, as revealed by phylogenetic analyses.

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Section: Effect Of the Inoculum Type On The Metabolic Profilesmentioning

confidence: 99%

Dark Fermentation Process Response to the Use of Undiluted Tequila Vinasse without Nutrient Supplementation

et al. 2021

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“…Considering its composition, cassava wastewater is considered a source of environmental pollution, due to its low pH (4.5–5.5), high carbohydrate content (about 100 g COD L −1 ), and total suspended solids (TSS) (Cappelletti et al, 2011; Colin et al, 2006; Mañunga et al, 2019). However, it is susceptible to anaerobic degradation, because of the high concentration of readily available and easily biodegradable sugars (Andreani et al, 2018; Hasan et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…This wastewater is a potential carbohydrate source for lactic acid production through anaerobic processes. It is an industrial residue composed of organic acids, mainly lactic acid, at a concentration ranging from 75% to 95% of the total metabolites quantified (Andreani et al, 2018; Colin et al, 2006; Mañunga et al, 2019) with an excess of microorganisms of the Lactobacillus genus (Saraphirom et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effect of initial pH and substrate concentration on the lactic acid production from cassava wastewater fermentation by an enriched culture of acidogenic microorganisms

Silva

Fernandes

Silva

2020

Water Environment Research

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Recently, cassava processing wastewater has been considered an alternative substrate for lactic acid production due to its appreciable carbohydrate levels. The authors carried out different batch reactor trials aiming to favor the production of lactic acid through the fermentation of non‐sterilized cassava wastewater by an enriched culture of acidogenic microorganisms. To this end, the impact of different initial pHs (4.5, 5.0, 5.7, 6.5, and 7.0) and different initial substrate concentrations (10, 15.8, 30, 44.2, and 50 g/L) in terms of glucose on lactic acid production yield (Y) was evaluated by applying the design of experiment (DoE) known as central composite rotatable design (CCRD). The highest rate of lactic acid production (40 g/L) occurred with an initial pH of 6.5 and an initial substrate concentration of 50 g/L. The maximum yield was higher in trials T1, T2, T4, T5, and T8, reaching values of 0.80, 0.62, 0.60, 0.96, and 0.70 g/g, respectively. The maximum lactic acid productivity (P), of 0.60 and 0.73 g L−1 hr−1, was observed in trials T5 and T8, respectively. The enriched culture of acidogenic microorganisms was shown to favor the production of lactic acid, since the production of other acids, such as acetic and propionic acid, did not exceed 3.5 and 4.5 g/L, respectively. © 2020 Water Environment Federation Practitioner points Cassava wastewater presented potential to lactic acid production. The CCRD showed that highest lactic acid concentrations (40 g/L). The adoption of cassava wastewater or manipueira as a substrate resulted in important information on the tendency to obtain value‐added products such as lactic acid.

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“…More significantly, some metabolic products of these bacteria (e.g., organic acids) have adverse effects on the HPB or disturb the bioH 2 fermentation, which further lowers the hydrogen yield and productivity or even stops the fermentation process [23]. Additionally, the input of microorganisms from substrates may change the bacterial community dynamics and further affect the hydrogen yield and productivity [24].…”

Section: Introductionmentioning

confidence: 99%

“…However, excess organic loading to a certain extent negatively impacts the H 2 fermentation process owing to the production of excess volatile fatty acids (VFAs) and a consequent reduction in pH and the system buffer capacity [27]. Moreover, high organics concentrations decrease the efficiency of hydrogen production via changes in the microbial communities and metabolic pathways [24,28]. Thus, hydrogen production and acidogenic fermentation are balanced by controlling the substrate loading.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen production from acidogenic food waste fermentation using untreated inoculum: Effect of substrate concentrations

Tang

Wang

et al. 2019

International Journal of Hydrogen Energy

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Impact of operational conditions on development of the hydrogen-producing microbial consortium in an AnSBBR from cassava wastewater rich in lactic acid

Cited by 32 publications

References 52 publications

Dark Fermentation Process Response to the Use of Undiluted Tequila Vinasse without Nutrient Supplementation

Dark Fermentation Process Response to the Use of Undiluted Tequila Vinasse without Nutrient Supplementation

Effect of initial pH and substrate concentration on the lactic acid production from cassava wastewater fermentation by an enriched culture of acidogenic microorganisms

Hydrogen production from acidogenic food waste fermentation using untreated inoculum: Effect of substrate concentrations

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