Evaluation of the influence of trace metals on methane production from domestic sewage, using the Plackett-Burman experimental design

Silva, Julliana Alves da; Braga, Adriana Ferreira Maluf; Fermoso, Fernando G.; Zaiat, Marcelo; Silva, Gustavo Henrique Ribeiro da

doi:10.1016/j.jenvman.2021.113002

Cited by 14 publications

(3 citation statements)

References 38 publications

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“…The Control scenario has a significantly lower average relative CH 4 production (α = 0.05) compared to the other scenarios that received supplementation of TEs. This observation is consistent with other studies (Braga et al, 2018;Da Silva et al, 2021). Theoretically, the volume of CH 4 derivable from the scenarios' VFA concentration is fixed; however, the rate at which the theoretical volume will be reached will vary depending on the biocatalytic potential of the scenarios.…”

Section: Comparing Ch 4 Production Across the Tes Supplementation Scenariossupporting

confidence: 91%

Derivation of volatile fatty acids concentration-independent optimum trace elements configuration and elucidation of optimization kinetics of biomethanization processes

Ezebuiro¹

2021

Nig. J. Biotechnol

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Trace elements (TEs) requirements for improved volatile fatty acids (VFA) degradation during biomethanization depend on VFA concentration of a reactor and the temperature of the process. While temperature remains relatively constant, VFA concentrations change in the course of biomethanization and this implies that for efficient VFA degradation, different trace elements configurations (TEC) should be supplemented. While this is the most efficient approach, it is impractical and constitutes a challenge for the effective use of TEs in the optimization of biomethanization processes. To alleviate this challenge, we modelled the biomethanization efficiency of various VFA concentration-dependent (VCD) TEs configuration as scenarios and derived a TEs configuration that produced optimum biomethanization across a wider range of VFA concentrations. The study was carried out at 37oC using different concentrations of fixed VFA composition and TEs configurations as scenarios. Response surface model and desirability function were used to determine and compare the biomethanization efficiency of the scenarios, and to derive a VFA concentration-independent (VCI) TEs configuration. Michaelis-Menten kinetics for two parameters was used to ascertain that the mechanism by which TEs supplementation enhanced mesophilic biomethanization was through an increase in maximum reaction rate (MRR). However, the enhancement was accompanied by an insignificant decline in inverse affinity (IA).

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Section: Comparing Ch 4 Production Across the Tes Supplementation Scenariossupporting

confidence: 91%

Derivation of volatile fatty acids concentration-independent optimum trace elements configuration and elucidation of optimization kinetics of biomethanization processes

Ezebuiro¹

2021

Nig. J. Biotechnol

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“…The lowest Ni concentration, 441 µg•dm −3 , was recorded on day 1 of the fermentation process in KF1, and the highest concentration, 587 µg•dm −3 , was recorded on day 21 of the fermentation process in this chamber. The average Ni concentration during the fermentation process in KF1 was 513 µg•dm −3 , which was within the range defined by [54,55]. In contrast, the KF2 chamber had the lowest Ni concentration of 466 µg•dm −3 , which was recorded on day 1 of the fermentation process, and the maximum value of 831 µg•dm −3 , which was recorded on day 26 of the fermentation process.…”

Section: Description Of the Kick-off Of The Kupin Biogas Plantsupporting

confidence: 61%

Study on the Effect of Dedicated Microelement Mixture (DMM) on the Kick-Off Phase of the Digester and Stabilization of the Methane Fermentation Process

et al. 2023

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The kick-off process is an important aspect of the proper operation of an agricultural biogas plant. At this stage, various operational problems may arise, mainly related to the stabilization of the fermentation process and reaching the full biogas production capacity. This paper presents the results of research on the kick-off of the fermentation process carried out on three selected biogas plants located in Poland. For the experiments, titration, potentiometric, and spectroscopic methods (ICP-MS) were used. The biogas plants during the kick-off period operated on the following substrates: a mixture of cattle and pig manure, corn silage, and whey liquor. Special attention was paid to the dosing process of the formulation developed by the authors (CMP-S1) containing Mo, Co, Ni, Se, and Mn for the fermentation chambers, to which the mixture of the selected microelements was not dosed. The study was carried out under real conditions on an engineering scale. The study showed that supplementing a dedicated mixture of microelements (DMM) in the first days of fermentation chamber kick-off has a positive effect on stabilizing the methane fermentation process and allows a faster and higher loading of fermenters with dry organic matter. The above translates into shortening the time (by more than half) of the kick-off process in the fermentation chamber, as well as brining about a significant reduction in costs.

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“…Anaerobic digestion (AD) reactors are supplemented with trace elements (TEs) during biomethanization to maximize the processes of methane (CH4) production, volatile fatty acids (VFAs) degradation and process stability (Braga et al, 2018;Mancini et al, 2018;Yazdanpanah et al, 2018). TEs improve biomethanization by enhancing the biocatalytic potentials of metalloenzymes (MEs) that are associated with AD, reduce digester acid accumulation and improve CH4 production (Ezebuiro and Koerner, 2017;Ezebuiro et al, 2018;Da Silva et al, 2021). Managing digester acidification is important because VFAs accumulation beyond critical levels of 200 mmol/L may lead to biomethanization failure (Zhang et al, 2010;Bardi and Aminirad, 2020).…”

Section: Introductionmentioning

confidence: 99%

Specialized trace elements and volatile fatty acids interactions for enhanced methane production and biomethanization process stability during high organic loading rate

Ezebuiro¹,

Körner²

2021

Nig. J. Biotechnol

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Volatile fatty acids (VFAs) and trace elements (TEs) interactions (VFAs*TEs) during biomethanization have effects that could be exploited to enhance anaerobic digestion (AD) of biomass. The goal of this study was to validate biocatalytic effects of specialized VFAs*TEs identified from a batch-derived Optimum TEs Configuration (or simply ‘Optimum’) on high organic loading rate (OLR) involving mixed fruit residue (MFR) fed in semi-continuous AD operation. The specialized VFAs*TEs were formulated as Variants of the Optimum and included Optimum –Cobalt (Co) for specialized VFAs*Co effects, and Optimum +Selenium (Se) for specialized VFAs*Se effects. Four duplicate AD reactors were treated with formulations reflecting the Optimum and the Variants. Each duplicate reactor was semi-continuously fed with MFR at varying OLR until instability occurred. Methane production, total volatile organic acidity (FOS) / total alkalinity (TAC) and VFAs fingerprints were measured as main responses. The results showed that reactors of the Optimum and its Variants were unstable at OLR of 8g oDM/L/d, but stability was restored in the Optimum –Co (FOS/TAC values of 0.6 compared to 1.51 and 1.67 for Optimum and Optimum +Se respectively). The average specific CH4 production (Nml/g oDM) of the Optimum and its Variants were Control: 431±36; Optimum: 553±16; Optimum –Co: 580±12; and Optimum +Se: 545±13. Optimum –Co also had the lowest acetic acid and butyric acid accumulation, but had higher propionic acid concentration (0.7 g/L) compared to the Optimum (0.3 g/L) and Optimum +Se (0.4 g/L).

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Evaluation of the influence of trace metals on methane production from domestic sewage, using the Plackett-Burman experimental design

Cited by 14 publications

References 38 publications

Derivation of volatile fatty acids concentration-independent optimum trace elements configuration and elucidation of optimization kinetics of biomethanization processes

Derivation of volatile fatty acids concentration-independent optimum trace elements configuration and elucidation of optimization kinetics of biomethanization processes

Study on the Effect of Dedicated Microelement Mixture (DMM) on the Kick-Off Phase of the Digester and Stabilization of the Methane Fermentation Process

Specialized trace elements and volatile fatty acids interactions for enhanced methane production and biomethanization process stability during high organic loading rate

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