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Optimization of simultaneous production of volatile fatty acids and bio-hydrogen from food waste using response surface methodology.

ABSTRACT: Anaerobic digestion of food waste (FW) is commonly considered an effective and green technology to convert solid waste into valuable feedstock including volatile fatty acids (VFAs) and hydrogen. Response surface methodology (RSM) was selected to analyze the production of VFAs and hydrogen from food waste in a batch process. The effect of the three variables i.e. total solid content (TS), pH, and reaction time under each variable at three levels on VFAs and hydrogen production was assessed. The optimum conditions determined via RSM were pH = 7.0, TS = 100 g L^-1, and reaction time = 3 d. The maximum VFA and hydrogen production was 26.17 g L^-1 and 46.03 mL g^-1 volatile solids added, respectively. The ratio of observed hydrogen (H_o) to predicted hydrogen (H_p) was x < 1.0 because of inhibition of hydrogen production by VFA accumulation. The subsequent microbial community analysis result was also consistent with the abovementioned results. The evolution of Bacteroidetes, which facilitate VFA production, has been enriched by about 16.1-times at pH 7.0 followed by 10.2-times at pH 6.0 as compared to that in the uncontrolled pH batch.

SUBMITTER: Liu N

PROVIDER: S-EPMC9078927 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature

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Optimization of simultaneous production of volatile fatty acids and bio-hydrogen from food waste using response surface methodology.

Liu Nuo N Jiang Jianguo J Yan Feng F Xu Yiwen Y Yang Meng M Gao Yuchen Y Aihemaiti Aikelaimu A Zou Quan Q

RSC advances 20180314 19

Anaerobic digestion of food waste (FW) is commonly considered an effective and green technology to convert solid waste into valuable feedstock including volatile fatty acids (VFAs) and hydrogen. Response surface methodology (RSM) was selected to analyze the production of VFAs and hydrogen from food waste in a batch process. The effect of the three variables <i>i.e.</i> total solid content (TS), pH, and reaction time under each variable at three levels on VFAs and hydrogen production was assessed ...[more]

PMID: 35540465

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Project description:The valorization of sewage sludge and food waste to produce energy and fertilizers is a well-stablished strategy within the circular economy. Despite the success of numerous laboratory-scale experiments in converting waste into high-value products such as volatile fatty acids (VFAs), large-scale implementation remains limited due to various technical and environmental challenges. Here, we evaluate the environmental performance of a hypothetical large-scale VFAs biorefinery located in Galicia, Spain, which integrates fermentation and purification processes to obtain commercial-grade VFAs based on primary data from pilot plant operations. We identify potential environmental hotspots, assess the influence of different feedstocks, and perform sensitivity analyses on critical factors like transportation distances and pH control methods, using life cycle assessment. Our findings reveal that, on a per-product basis, food waste provides superior environmental performance compared to sewage sludge, which, conversely, performs better when assessed per mass of waste valorized. This suggests that higher process productivity from more suitable wastes leads to lower environmental impacts but must be balanced against increased energy and chemical consumption, as food waste processing requires more electricity for pretreatment and solid-liquid separation. Further analysis reveals that the main operational impacts are chemical-related, primarily due to the use of NaOH for pH adjustment. Additionally, facility location is critical, potentially accounting for up to 99% of operational impacts due to transportation. Overall, our analysis demonstrates that the proposed VFAs biorefinery has a carbon footprint comparable to other bio-based technologies. However, enhancements in VFAs purification processes are necessary to fully replace petrochemical production. These findings highlight the potential of waste valorization into VFAs as a sustainable alternative, emphasizing the importance of process optimization and strategic facility placement.

Dataset Information

Optimization of simultaneous production of volatile fatty acids and bio-hydrogen from food waste using response surface methodology.

Publications

Optimization of simultaneous production of volatile fatty acids and bio-hydrogen from food waste using response surface methodology.

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