Selective VFA production potential from organic waste streams: Assessing temperature and pH influence

García-Aguirre, Jon; Aymerich, Enrique; Goñi, Jaime; Esteban-Gutiérrez, Myriam

doi:10.1016/j.biortech.2017.07.187

Cited by 181 publications

(57 citation statements)

References 34 publications

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“…Ethanol-type fermentation is observed mostly at pH 4.0-4.5 and may feature high gas production [27,33]. More alkaline pH favors production of acetic acid while inhibiting growth of methanogens [34]. Propionic acid is another mayor fermentation product.…”

Section: Microbial Consortia and The Main Products In A Microbial Hydmentioning

confidence: 99%

Role of Microbial Hydrolysis in Anaerobic Digestion

2020

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There is a growing need of substrate flexibility for biobased production of energy and value-added products that allows the application of variable biodegradable residues within a circular economy. It can be used to balance fluctuating energy provision of other renewable sources. Hydrolysis presents one of the biggest limitations during anaerobic digestion. Methods to improve it will result in broader process applicability and improved integration into regional material cycles. Recently, one focus of anaerobic digestion research has been directed to systems with a separate hydrolysis–acidogenesis stage as it might be promised to improve process performance. Conditions can be adjusted to each class of microorganisms individually without harming methanogenic microorganisms. Extensive research of separate biomass pretreatment via biological, chemical, physical or mixed methods has been conducted. Nevertheless, several methods lack economic efficiency, have a high environmental impact or focus on specific substrates. Pretreatment via a separate hydrolysis stage as cell-driven biotransformation in a suspension might be an alternative that enables high yields, flexible feeding and production, and a better process control. In this review, we summarize existing technologies for microbial hydrolytic biotransformation in a separate reactor stage and the impacts of substrate, operational parameters, combined methods and process design as well as remaining challenges.

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Section: Microbial Consortia and The Main Products In A Microbial Hydmentioning

confidence: 99%

Role of Microbial Hydrolysis in Anaerobic Digestion

2020

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“…Among a wide variety of recovered products from industrial waste streams, the described products are most promising with their potential as a raw material for post-processing. Most of the described technologies are still being developed at laboratory and/or pilot scales (e.g., bioelectrochemical systems, VFA production) (Chen et al 2017;Garcia-Aguirre et al 2017;Jankowska et al 2017), except biogas production, which is established and implemented at full scale (Mauky et al 2017;Martí-Herrero et al 2019). In addition to biogas, bioplastic production has also been applied at pilot scale (Tamis et al 2018).…”

Section: Technologies and Productsmentioning

confidence: 99%

A review of nature-based solutions for resource recovery in cities

Kisser¹,

Wirth²,

Gusseme

et al. 2020

Blue-Green Systems

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Our modern cities are resource sinks designed on the current linear economic model which recovers very little of the original input. As the current model is not sustainable, a viable solution is to recover and reuse parts of the input. In this context, resource recovery using nature-based solutions (NBS) is gaining popularity worldwide. In this specific review, we focus on NBS as technologies that bring nature into cities and those that are derived from nature, using (micro)organisms as principal agents, provided they enable resource recovery. The findings presented in this work are based on an extensive literature review, as well as on original results of recent innovation projects across Europe. The case studies were collected by participants of the COST Action Circular City, which includes a portfolio of more than 92 projects. The present review article focuses on urban wastewater, industrial wastewater, municipal solid waste and gaseous effluents, the recoverable products (e.g., nutrients, nanoparticles, energy), as well as the implications of source-separation and circularity by design. The analysis also includes assessment of the maturity of different technologies (technology readiness level) and the barriers that need to be overcome to accelerate the transition to resilient, self-sustainable cities of the future.

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“…In recent years, researches on the VFA production by anaerobic fermentation of various organic wastes (such as food waste, wastewater) attract considerable attentions [14,15], since it is the simple process for the simultaneous conversion of organic wastes and syngas to VFA. The VFAs/ethanol production from syngas and organic wastes has been performed using anaerobic fermentation, while which was mainly achieved by pure cultures [16,17].…”

Section: Introductionmentioning

confidence: 99%

Microbial insights of enhanced anaerobic conversion of syngas into volatile fatty acids by co-fermentation with carbohydrate-rich synthetic wastewater

Liu

Wang

O‐Thong

et al. 2020

Biotechnol Biofuels

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Background: The co-fermentation of syngas (mainly CO, H 2 and CO 2) and different concentrations of carbohydrate/ protein synthetic wastewater to produce volatile fatty acids (VFAs) was conducted in the present study. Results: It was found that co-fermentation of syngas with carbohydrate-rich synthetic wastewater could enhance the conversion efficiency of syngas and the most efficient conversion of syngas was obtained by co-fermentation of syngas with 5 g/L glucose, which resulted in 25% and 43% increased conversion efficiencies of CO and H 2 , compared to syngas alone. The protein-rich synthetic wastewater as co-substrate, however, had inhibition on syngas conversion due to the presence of high concentration of NH 4 +-N (> 900 mg/L) produced from protein degradation. qPCR analysis found higher concentration of acetogens, which could use CO and H 2 , was present in syngas and glucose co-fermentation system, compared to glucose solo-fermentation or syngas solo-fermentation. In addition, the known acetogen Clostridium formicoaceticum, which could utilize both carbohydrate and CO/H 2 was enriched in syngas solofermentation and syngas with glucose co-fermentation. In addition, butyrate was detected in syngas and glucose co-fermentation system, compared to glucose solo-fermentation. The detected n-butyrate could be converted from acetate and lactate/ethanol which produced from glucose in syngas and glucose co-fermentation system supported by label-free quantitative proteomic analysis. Conclusions: These results demonstrated that the co-fermentation with syngas and carbohydrate-rich wastewater could be a promising technology to increase the conversion of syngas to VFAs. In addition, the syngas and glucose co-fermentation system could change the degradation pathway of glucose in co-fermentation and produce fatty acids with longer carbon chain supported by microbial community and label-free quantitative proteomic analysis. The above results are innovative and lead to achieve effective conversion of syngas into VFAs/longer chain fatty acids, which would for sure have a great interest for the scientific and engineering community. Furthermore, the present study also used the combination of high-throughput sequencing of 16S rRNA genes, qPCR analysis and label-free

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Selective VFA production potential from organic waste streams: Assessing temperature and pH influence

Cited by 181 publications

References 34 publications

Role of Microbial Hydrolysis in Anaerobic Digestion

Role of Microbial Hydrolysis in Anaerobic Digestion

A review of nature-based solutions for resource recovery in cities

Microbial insights of enhanced anaerobic conversion of syngas into volatile fatty acids by co-fermentation with carbohydrate-rich synthetic wastewater

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