From sewage sludge and agri-food waste to VFA: Individual acid production potential and up-scaling

Esteban-Gutiérrez, Myriam; García-Aguirre, Jon; Irizar, I.; Aymerich, Enrique

doi:10.1016/j.wasman.2018.05.027

Cited by 97 publications

(30 citation statements)

References 27 publications

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“…The production of VFAs through mixed consortia fermentation can utilize more complex substrates in nonsterile conditions (Jankowska, Chwiałkowska, Stodolny, & Oleskowicz-Popiel, 2015;Jankowska, Duber, Chwialkowska, Stodolny, & Oleskowicz-Popiel, 2018). However, to date, the VFA production process through anaerobic digestion with mixed consortia is still in the upscaling phase (Esteban-Gutiérrez, Garcia-Aguirre, Irizar, & Aymerich, 2018) and the full-scale production has been tested with very narrow spectrum of utilizable biomasses, for example, with sewage sludge (Liu et al, 2018). Therefore, there is currently a need to evaluate the potential of various biomasses as substrates for mixed consortia VFA fermentation to boost the production of green chemicals in the circular economy.…”

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Volatile fatty acids (VFAs) and methane from food waste and cow slurry: Comparison of biogas and VFA fermentation processes

et al. 2018

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The potential of various biomasses for the production of green chemicals is currently one of the key topics in the field of the circular economy. Volatile fatty acids (VFAs) are intermediates in the methane formation pathway of anaerobic digestion and they can be produced in similar reactors as biogas to increase the productivity of a digestion plant, as VFAs have more varying end uses compared to biogas and methane. In this study, the aim was to assess the biogas and VFA production of food waste (FW) and cow slurry (CS) using the anaerobic biogas plant inoculum treating the corresponding substrates. The biogas and VFA production of both biomasses were studied in identical batch scale laboratory conditions while the process performance was assessed with chemical and microbial analyses. As a result, FW and CS were shown to have different chemical performances and microbial dynamics in both VFA and biogas processes. FW as a substrate showed higher yields in both processes (435 ml CH4/g VSfed and 434 mg VFA/g VSfed) due to its characteristics (pH, organic composition, microbial communities), and thus, the vast volume of CS makes it also a relevant substrate for VFA and biogas production. In this study, VFA profiles were highly dependent on the substrate and inoculum characteristics, while orders Clostridiales and Lactobacillales were connected with high VFA and butyric acid production with FW as a substrate. In conclusion, anaerobic digestion supports the implementation of the waste management hierarchy as it enables the production of renewable green chemicals from both urban and rural waste materials.

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confidence: 99%

Volatile fatty acids (VFAs) and methane from food waste and cow slurry: Comparison of biogas and VFA fermentation processes

et al. 2018

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“…In other words, the low pH with accumulation of VFAs inhibits the activity of methane-producing bacteria, and the biogas production of the digester is suppressed [5,28].…”

Section: Characteristics Of Samplesmentioning

confidence: 99%

“…The ratio of C/N in the anaerobic co-digestion process should be balanced for cultivation of microorganisms [13]. According to the literature, the recommended ratio of C/N for biological wastewater treatment ranges from 20:1 to 30:1 [13,28]. However, in the anaerobic co-digestion process for production of biogas, the optimum C/N ratio may vary depending on properties of the mixed materials, particle size, ammonia concentration, pH, etc.…”

Section: Characteristics Of Samplesmentioning

confidence: 99%

“…Excessively high C/N ratio, i.e., very low nitrogen content of the anaerobic co-digestion process, affects microbial composition and metabolic pathways, inhibiting cell growth and biogas production [3,7,23]. In contrast, excessively low C/N ratio inhibits methanogenesis due to release of a high concentration of free ammonia upon decomposition and accumulation of volatile fatty acids [12,28]. Therefore, it is important to maintain an optimal C/N ratio to increase biogas production and sludge reduction.…”

Section: Characteristics Of Samplesmentioning

confidence: 99%

“…The primary objectives of anaerobic co-digestion are biogas production and reduction of sewage sludge. Volatile solids reduction is a typical indicator of organic material reduction in anaerobic co-digestion [23,28]. Generally, the reduction efficiency of activated sludge in an anaerobic digester is 30-45% [4].…”

Section: Sludge Reduction In Anaerobic Co-digestionmentioning

confidence: 99%

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Influence of acidogenic fermented fish by-products with rice bran for sludge reduction and biogas recovery in anaerobic co-digestion

Choi

2020

Environmental Engineering Research

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The purpose of this study was to investigate the effects of acidogenic fermentation broth with rice bran (RFFB), tap water (TFFB), or raw fishery by-products (FBs) on sludge reduction and biogas production in an anaerobic co-digestion process. Acidogenic fermentation of FBs with rice bran was faster and produced more volatile fatty acids than that with tap water. Reduction efficiencies for chemical oxygen demand, volatile solids, and total solids were highest in RFFB. In the kinetic analysis, λ (d), which represents the duration of the lag phase, was shortest with RFFB (1.09 d) and highest in sewage sludge (8.86 d). As the loading amount of volatile solids and chemical oxygen demand increased, the amount of cumulative biogas also increased. Amount of produced methane and energy recovery were highest with RFFB (5.71 kWh). Anaerobic co-digestion of FFB and sewage sludge allowed reduced sludge and recovered energy using the discarded waste as an organic carbon source.

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Applications of Biosurfactant for Microbial Bioenergy/Value-Added Bio-Metabolite Recovery from Waste Activated Sludge

Zhou

Duan

Wei

et al. 2021

Environmental and Microbial Biotechnology

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From sewage sludge and agri-food waste to VFA: Individual acid production potential and up-scaling

Cited by 97 publications

References 27 publications

Volatile fatty acids (VFAs) and methane from food waste and cow slurry: Comparison of biogas and VFA fermentation processes

Volatile fatty acids (VFAs) and methane from food waste and cow slurry: Comparison of biogas and VFA fermentation processes

Influence of acidogenic fermented fish by-products with rice bran for sludge reduction and biogas recovery in anaerobic co-digestion

Applications of Biosurfactant for Microbial Bioenergy/Value-Added Bio-Metabolite Recovery from Waste Activated Sludge

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