Factors influencing volatile fatty acids production from food wastes via anaerobic digestion

Lukitawesa, Lukitawesa; Patinvoh, Regina J.; Millati, Ria; Sarvari-Horvath, Ilona; Taherzadeh, Mohammad J.

doi:10.1080/21655979.2019.1703544

Cited by 129 publications

(68 citation statements)

References 48 publications

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“…It has previously shown to completely the inhibit activity of methanogens at a concentration of 50 mM (also used in this study) [52,54]. Nevertheless, the literature shows contrasting effects of BES on inhibition of methanogens and VFA production which appear to be correlated to organic substrate loading [21,46,54]. In a recent study conducted by Lukitawesa and coll.…”

Section: Selection Of Influential Factorsmentioning

confidence: 69%

“…The inoculum had the TS and VS content of 4.3% ± 0.5% and 2.6% ± 1%, respectively. Sub-culturing the inoculum with the same wastes as used for the experimental batch runs allowed for acclimatization of the thermophilic microbial consortium which is favorable for achieving higher acetate production [46][47][48][49]. Though the cafeteria waste had lower VS/TS percentage, it consisted of a higher amount of easily biodegradable organic compounds which made it a more easily hydrolyzable substrate for acetate production compared to corn stover.…”

Section: Substrate and Inoculum Characteristicsmentioning

confidence: 99%

“…Based on previous work and the available literature [21,46,50], 10 factors that could influence acetate fermentation and growth of the acetogenic consortium were selected. The influence of these 10 factors, i.e., temperature, pH, C:N ratio, shaking (100 rpm), BES (50mM), NaHCO 3 , NH 4 Cl, MgCl 2 .6H 2 O, KCl, and Na 2 S.9H 2 O, was investigated using two-level factorial design.…”

Section: Selection Of Influential Factorsmentioning

confidence: 99%

“…The influence of these 10 factors, i.e., temperature, pH, C:N ratio, shaking (100 rpm), BES (50mM), NaHCO 3 , NH 4 Cl, MgCl 2 .6H 2 O, KCl, and Na 2 S.9H 2 O, was investigated using two-level factorial design. Two-level factorials can be used for screening many factors to find the significant few [21,46]. Parameters, experimental runs, and response (acetate concentration) of the experimental design are shown in Supplementary Table S1.…”

Section: Selection Of Influential Factorsmentioning

confidence: 99%

See 3 more Smart Citations

Acetate Production from Cafeteria Wastes and Corn Stover Using a Thermophilic Anaerobic Consortium: A Prelude Study for the Use of Acetate for the Production of Value-Added Products

2020

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Efficient and sustainable biochemical production using low-cost waste assumes considerable industrial and ecological importance. Solid organic wastes (SOWs) are inexpensive, abundantly available resources and their bioconversion to volatile fatty acids, especially acetate, aids in relieving the requirements of pure sugars for microbial biochemical productions in industries. Acetate production from SOW that utilizes the organic carbon of these wastes is used as an efficient solid waste reduction strategy if the environmental factors are optimized. This study screens and optimizes influential factors (physical and chemical) for acetate production by a thermophilic acetogenic consortium using two SOWs—cafeteria wastes and corn stover. The screening experiment revealed significant effects of temperature, bromoethane sulfonate, and shaking on acetate production. Temperature, medium pH, and C:N ratio were further optimized using statistical optimization with response surface methodology. The maximum acetate concentration of 8061 mg L−1 (>200% improvement) was achieved at temperature, pH, and C:N ratio of 60 °C, 6, 25, respectively, and acetate accounted for more than 85% of metabolites. This study also demonstrated the feasibility of using acetate-rich fermentate (obtained from SOWs) as a substrate for the growth of industrially relevant yeast Yarrowia lipolytica, which can convert acetate into higher-value biochemicals.

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Section: Selection Of Influential Factorsmentioning

confidence: 69%

Section: Substrate and Inoculum Characteristicsmentioning

confidence: 99%

Section: Selection Of Influential Factorsmentioning

confidence: 99%

Section: Selection Of Influential Factorsmentioning

confidence: 99%

See 2 more Smart Citations

Acetate Production from Cafeteria Wastes and Corn Stover Using a Thermophilic Anaerobic Consortium: A Prelude Study for the Use of Acetate for the Production of Value-Added Products

2020

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“…2b). This inhibition at maximum OLR could be the accumulation of high VFA contents results in dropping the pH values of the system or could be the high loading rate which might be intolerable by the methanogens in the digester [31,32,33].…”

Section: Resultsmentioning

confidence: 99%

Assessment of multiple anaerobic co-digestions and related microbial community of molasses with rice alcohol wastewater

Khan

Jiang

et al. 2020

Preprint

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Background Molasses is a highly dense and refined byproduct produced in the sugarcane industry, and it contains high amounts of degradable compounds. These compounds can potentially be converted into renewable products biologically. However, the involved biological process is negatively influenced by the high chemical oxygen demand (COD) of molasses and its high ion concentration, although this problem is commonly addressed by dilutions. Results The co-digestion of molasses with rice alcohol waste water (RAW) was compared with its mono-digestion at an increasing organic loading rate (OLR). Both processes were assessed by detecting the COD removal rate, the methane contents of biogas, and the structure and composition of microbial communities at different stages. Results showed that the co-digestion is stable up to a maximum OLR of 16 g COD L− 1d− 1. By contrast, after the acclimatization phase, the mono-digestion process was upset twice, which occurred at a maximum OLR of 9 and 10 g COD L− 1d− 1. The co-digestion procgess demonstrated consistency in terms of COD removal rates (86.36% ± 0.99–90.72% ± 0.63%) and methane contents (58.10% ± 1.12–64.47% ± 0.59%) compared with the mono-digestion process. Microbial community analysis showed that the relative abundance of bacterial and archaeal communities differs between the processes at different stages. However, in both processes, Propionibacteriaceae was the most abundant family in the bacterial communities, whereas Methanosaetaceae was abundant in the archaeal communities. Conclusion Rice alcohol wastewater could be a good co-substrate for anaerobic digestion of molasses. Integrate molasses into progressive biogas production at high OLR.

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Anaerobic digestion of cornmeal – the effect of crude enzyme extract and co‐digestion with cow manure

Pinheiro

Wainaina

Polizeli

et al. 2021

Biofuels Bioprod Bioref

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This study examined the effect of a crude enzyme extract, containing mainly starchdegrading enzymes, on cornmeal (Zea mays) hydrolysis. This was followed by an investigation of the effect of enzymatic treatment for the anaerobic digestion of this biomass. Cornmeal and cow manure were also co-digested, and both batch and semi-continuous experiments were performed. The enzymatic pretreatment of cornmeal resulted in a yield of 65 ± 5% reducing sugars, with 1:10 w/v (grams of dry substrate per mililiters of enzyme extract) enzyme load at 45 °C for 48 h. There was an 8% enhancement of methane production observed during the batch assays, both when cornmeal hydrolysate was digested and when enzymes were added directly to the digester. Synergetic effects were found when co-digesting cornmeal and cow manure, leading to higher methane yield (280 NmL gVS -1 ) than that (200 NmL gVS -1 ) calculated based on the methane potential of the individual substrates. Regarding long-term effects, the laboratory-scale semi-continuous experiments also demonstrated that the co-digestion of cornmeal and cow manure (1:1 volatile solid (VS) basis) led to a stable process reaching an organic loading rate of 3 g VS L day -1 and achieving a daily methane production of 1280.12 ± 99.4 NmL CH 4 /day. However, when cornmeal was investigated in monodigestion, and the enzyme extract was directly added during semi-continuous digestion of cornmeal, volatile fatty acid (VFA) accumulation was observed, leading to a decrease in pH, and no significant enhancement of the conversion into methane was observed.

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Factors influencing volatile fatty acids production from food wastes via anaerobic digestion

Cited by 129 publications

References 48 publications

Acetate Production from Cafeteria Wastes and Corn Stover Using a Thermophilic Anaerobic Consortium: A Prelude Study for the Use of Acetate for the Production of Value-Added Products

Acetate Production from Cafeteria Wastes and Corn Stover Using a Thermophilic Anaerobic Consortium: A Prelude Study for the Use of Acetate for the Production of Value-Added Products

Assessment of multiple anaerobic co-digestions and related microbial community of molasses with rice alcohol wastewater

Anaerobic digestion of cornmeal – the effect of crude enzyme extract and co‐digestion with cow manure

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