Review on anaerobic digestion models: Model classification &amp; elaboration of process phenomena

Emebu, Samuel; Pecha, Jiří; Janáčová, Dagmar

doi:10.1016/j.rser.2022.112288

Cited by 59 publications

(30 citation statements)

References 142 publications

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“…In anaerobic digestion, the graph of biogas accumulation is very important for observing the microbial growth rate of the system [ 37 ]. The relationship between biogas accumulation and time was investigated using 2 cm, 4 cm, 6 cm, 8 cm, and control, and the results are graphically represented in Figure 1 .…”

Section: Resultsmentioning

confidence: 99%

Effect of Electrode Spacing on the Performance of a Membrane-Less Microbial Fuel Cell with Magnetite as an Additive

et al. 2023

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A microbial fuel cell (MFC) is a bioelectrochemical system that can be employed for the generation of electrical energy under microbial activity during wastewater treatment practices. The optimization of electrode spacing is perhaps key to enhancing the performance of an MFC. In this study, electrode spacing was evaluated to determine its effect on the performance of MFCs. The experimental work was conducted utilizing batch digesters with electrode spacings of 2.0 cm, 4.0 cm, 6.0 cm, and 8.0 cm. The results demonstrate that the performance of the MFC improved when the electrode spacing increased from 2.0 to 6.0 cm. However, the efficiency decreased after 6.0 cm. The digester with an electrode spacing of 6.0 cm enhanced the efficiency of the MFC, which led to smaller internal resistance and greater biogas production of 662.4 mL/g VSfed. The electrochemical efficiency analysis demonstrated higher coulombic efficiency (68.7%) and electrical conductivity (177.9 µS/cm) for the 6.0 cm, which was evident from the enrichment of electrochemically active microorganisms. With regards to toxic contaminant removal, the same digester also performed well, revealing removals of over 83% for chemical oxygen demand (COD), total solids (TS), total suspended solids (TSS), and volatile solids (VS). Therefore, these results indicate that electrode spacing is a factor affecting the performance of an MFC, with an electrode spacing of 6.0 cm revealing the greatest potential to maximize biogas generation and the degradability of wastewater biochemical matter.

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Section: Resultsmentioning

confidence: 99%

Effect of Electrode Spacing on the Performance of a Membrane-Less Microbial Fuel Cell with Magnetite as an Additive

et al. 2023

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“…Kinetic models are important tools to quantify, predict and understand synergistic improvements in biogas production. Key factors obtained from these specific rate-limiting models include digestion rates, lag times and production rates 40 . In this study, two of the most applicable models in anaerobic digestion were used to simulate the cumulative biogas production data, the modified Gompertz model and first order kinetic model (Table S2 ).…”

Section: Resultsmentioning

confidence: 99%

“…The first order model was applied to fit the biogas data and evaluate the rate-limiting constant k. However, this model yielded a poor fit especially during the acclimation and 1st cycle with r 2 values ranging between 0.729 and 0.969 for all reactors. The first order model accounts for the exponential phase of the biogas production without incorporating the lag phase which could explain the low r 2 values obtained 37 , 40 . By removing the data points corresponding to the lag phase, an improved fit was observed with r 2 ranging between 0.94 and 1.00 for all reactors and cycles.…”

Section: Resultsmentioning

confidence: 99%

Investigating microbial dynamics and potential advantages of anaerobic co-digestion of cheese whey and poultry slaughterhouse wastewaters

Abdallah

Greige

Beyenal

et al. 2022

Sci Rep

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Resource recovery and prevention of environmental pollution are key goals for sustainable development. It is widely reported that agro-industrial activities are responsible for the discharge of billions of liters of wastewater to the environment. Anaerobic digestion of these energy rich agro-industrial wastewaters can simultaneously mitigate environmental pollution and recover embedded energy as methane gas. In this study, an assessment of mono- and co-digestion of cheese whey wastewater (CWW) and poultry slaughterhouse wastewater (PSW) was conducted in 2.25-L lab-scale anaerobic digesters. Treatment combinations evaluated included CWW (R1), PSW (R2), 75:25 CWW:PSW (R3), 25:75 CWW:PSW (R4), and 50:50 CWW:PSW (R5). The digestion efficiencies of the mixed wastewaters were compared to the weighted efficiencies of the corresponding combined mono-digested samples. R4, with a mixture of 25% CWW and 75% PSW, achieved the greatest treatment efficiency. This corresponded with an average biodegradability of 84%, which was greater than for R1 and R2 at 68.5 and 71.9%, respectively. Similarly, R4 produced the highest average cumulative methane value compared to R1 and R2 at 1.22× and 1.39× for similar COD loading, respectively. The modified Gompertz model provided the best fit for the obtained methane production data, with lag time decreasing over progressive treatment cycles. PCoA and heatmap analysis of relative microbial abundances indicated a divergence of microbial communities based on feed type over the treatment cycles. Microbial community analysis showed that genus Petrimonas attained the highest relative abundance (RA) at up to 38.9% in the first two cycles, then subsequently decreased to near 0% for all reactors. Syntrophomonas was highly abundant in PSW reactors, reaching up to 36% RA. Acinetobacter was present mostly in CWW reactors with a RA reaching 56.5%. The methanogenic community was dominated by Methanothrix (84.3–99.9% of archaea). The presence of phosphate and Acinetobacter in CWW feed appeared to reduce the treatment efficiency of associated reactors. Despite Acinetobacter being strictly aerobic, previous and current results indicate its survival under anaerobic conditions, with the storage of phosphate likely playing a key role in its ability to scavenge acetate during the digestion process.

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“…Kinetic models are useful for quantifying, predicting, and understanding synergistic biogas production gains. Digestion rates, lag durations, and output rates are among the key characteristics derived from these rate-limiting models (Emebu et al 2022). Determining the kinetic factors and parameters that could affect the process, is a first step towards designing a full scale plant.…”

Section: Kinetic Study Discussionmentioning

confidence: 99%

“…The first-order model only accounts for the exponential phase of biogas generation, leaving out the lag phase, which could explain the low r2 values found. (Emebu et al, 2022;Zahan et al, 2018).…”

Section: Kinetic Study Discussionmentioning

confidence: 99%

Batch Anaerobic Co-digestion of Agro-industrial Wastewater Produced in the Upper Litani Basin Lebanon. (c2022)

Hashem¹

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The Litani River in Lebanon is subjected to many pollution sources originating from the agro-industries including dairy farms and slaughterhouses. This pollution is leading to a severe degradation in water quality. The aim of this research is to mitigate pollution resulting from the discharge of wastewaters originating from dairy farm and poultry slaughter house industries. The study included characterization of wastewaters samples collected from the upper Litani basin followed by mono-digestion and co-digestion experiments. The digested samples included cheese whey wastewater (CWW) and poultry slaughterhouse wastewater (PSW). The study was conducted in 5-L lab-scale anaerobic digesters at an organic loading rate of 1.1 g.COD/L.day for 58 days. Treatment combinations included CWW (R1), PSW (R2), 75:25 CWW:PSW (R3), 25:75 CWW:PSW (R4), and 50:50 CWW:PSW (R5). The test results indicated that R4 with 25:75 CWW:PSW combination yielded the best treatment outcome. A kinetic assessment was conducted for the five reactors to evaluate the disgestion kinetic parameters and lag time. The study showed that the logistic function model yielded the best fit for the cumulative methane data.

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Review on anaerobic digestion models: Model classification & elaboration of process phenomena

Cited by 59 publications

References 142 publications

Effect of Electrode Spacing on the Performance of a Membrane-Less Microbial Fuel Cell with Magnetite as an Additive

Effect of Electrode Spacing on the Performance of a Membrane-Less Microbial Fuel Cell with Magnetite as an Additive

Investigating microbial dynamics and potential advantages of anaerobic co-digestion of cheese whey and poultry slaughterhouse wastewaters

Batch Anaerobic Co-digestion of Agro-industrial Wastewater Produced in the Upper Litani Basin Lebanon. (c2022)

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