Methane yields during anaerobic co-digestion of animal manure with other feedstocks: A meta-analysis

Ma, Guiling; Ndegwa, Pius M.; Harrison, J.A.; Chen, Yanting

doi:10.1016/j.scitotenv.2020.138224

Cited by 70 publications

(50 citation statements)

References 58 publications

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“…To improve biodigester performance, co-digestion is a widely accepted optimisation strategy. Typically, co-digestion improves anaerobic digestion optimisation metrics by dilution of inhibitors to levels below minimum inhibitory concentrations (MICs) and/or improves nutritional balances within the substrate, such as the important carbon:nitrogen:phosphorous (C:N:P) ratio necessary to increase microbial proliferation 30 , 31 . Pertinent to the fermentation strategy is the prior determination of maximum biogas yield possible from a given amount of mono substrate or mixture (co-digestion) in a near ideal batch fermentation, which can be estimated using the biomethane potential (BMP) laboratory test/assay 32 .…”

Section: Introductionmentioning

confidence: 99%

Applying PICRUSt and 16S rRNA functional characterisation to predicting co-digestion strategies of various animal manures for biogas production

Ijoma

Nkuna

Mutungwazi

et al. 2021

Sci Rep

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An estimated 25 million tons of animal manure is produced globally every year, causing considerable impact to the environment. These impacts can be managed through the use of anaerobic digestion (AD) This process achieves waste degradation through enzymatic activity, the efficiency of the AD process is directly related to microorganisms that produce these enzymes. Biomethane potential (BMP) assays remain the standard theoretical framework to pre-determine biogas yield and have been used to determine the feasibility of substrates or their combination for biogas production. However, an integrated approach that combines substrate choice and co-digestion would provide an improvement to the current predictive models. PICRUSt (Phylogenetic Investigation of Communities by Reconstruction of Unobserved States) addresses the limitations of assays in this regard. In this paper, the biochemical functions of horse, cow, and pig manures are predicted. A total of 135 predicted KEGG Orthologies (KOs) showed amino acids, carbohydrate, energy, lipid, and xenobiotic metabolisms in all the samples. Linear discriminant analysis (LDA) combined with the effect size measurements (LEfSe), showed that fructose, mannose, amino acid and nucleotide sugar, phosphotransferase (PST) as well as starch and sucrose metabolisms were significantly higher in horse manure samples. 36 of the KOs were related to the acidogenesis and/or acetogenesis AD stages. Extended bar plots showed that 11 significant predictions were observed for horse-cow, while 5 were predicted for horse-pig and for cow-pig manures. Based on these predictions, the AD process can be enhanced through co-digestion strategies that takes into account the predicted metabolic contributions of the manure samples. The results supported the BMP calculations for the samples in this study. Biogas yields can be improved if this combined approach is employed in routine analysis before co-digesting different substrates.

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Section: Introductionmentioning

confidence: 99%

Applying PICRUSt and 16S rRNA functional characterisation to predicting co-digestion strategies of various animal manures for biogas production

Ijoma

Nkuna

Mutungwazi

et al. 2021

Sci Rep

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“…Biogas plants running with liquid cattle manure typically operate at the lower level of this range, as higher loads are somewhat limited by the high water content of the manure (Ahlberg-Eliasson, 2018). However, co-digestion of manure with complementary and more energy-dense materials allows increased organic load and can improve both methane production and degradation efficiency, without significantly changing the hydraulic retention time (HRT) (Mata-Alvarez et al, 2014;Sondergaard et al, 2015;Ahlberg-Eliasson et al, 2017;Ma et al, 2020). Today, many farm-scale biogas plants in Sweden mainly operate under mesophilic conditions, i.e., 38 °C-40 °C (Ahlberg-Eliasson et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Digestion of Animal Manure and Influence of Organic Loading Rate and Temperature on Process Performance, Microbiology, and Methane Emission From Digestates

Ahlberg-Eliasson¹,

Westerholm²,

Isaksson³

et al. 2021

Front. Energy Res.

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Biogas production from manure is of particular value in regard of lowering greenhouse gas emissions and enhancing nutrient re-circulation. However, the relatively low energy content and the characteristics of manure often result in low degradation efficiency, and the development of operating strategies is required to improve the biogas yield and the economic benefits. In this study, the potential to enhance the performance of two full-scale biogas plants operating with cattle manure, in mono-digestion or combined with poultry manure, was investigated. Four continuously fed laboratory-scale reactors were operated in sets of two, in which the temperature in one reactor in each set was increased from 37–42°C to 52°C. The potential to increase the capacity was thereafter assessed by increasing the organic loading rate (OLR), from ca 3 to 5 kg volatile solids (VS)/ m3 and day. The processes were evaluated with both chemical and microbiological parameters, and in addition, the residual methane potential (RMP) was measured to evaluate the risk of increased methane emissions from the digestate. The results showed that both processes could be changed from mesophilic to themophilic temperature without major problems and with a similar shift in the microbial community profile to a typical thermophilic community, e.g., an increase in the relative abundance of the phylum Firmicutes. However, the temperature increase in the reactor co-digesting cattle and poultry manure caused a slight accumulation of fatty acids (2 g/l) and reduced the specific methane production, most likely due to ammonia inhibition (0.4–0.7 g NH3/l). Still, during operation at higher OLR, thermophilic as compared to mesophilic temperature slightly increased the methane yield and specific methane production, in both investigated processes. However, the higher OLR decreased the overall degree of degradation in all processes, and this showed a positive correlation with increased RMP values. Chemical analyses suggested that high RMP values (40–98 Nml gVS−1) were related to the degradation of cellulose, hemicellulose, and volatile fatty acid enriched in the digestate. Conclusively, increased temperature and load can increase the methane yield from manure but can result in less efficient degradation and increased risks for methane emissions during storage and handling of the digestate.

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“…The improvements of this study were superior to those of other investigations on co‐digestion of animal residues. Ma et al 99 . carried out an investigation in which they reported the improvements in the co‐digestion of pig manure, bobbin, and poultry manure residues; they determined that the co‐digestion of these manures with other co‐substrates improves methane production by 20, 38, and 22% respectively.…”

Section: Discussionmentioning

confidence: 99%

Effect of the co‐digestion of agricultural lignocellulosic residues with manure from South American camelids

Meneses-Quelal

Gaibor‐Chávez

Niño

2021

Biofuels Bioprod Bioref

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This study aims to evaluate the effects of the co‐digestion of agricultural residues with manure from camelids from the Andean zone. Different combinations of llama manure (LM) and vicuñas (VM) were made with amaranth (AS), quinoa (QS), and wheat (WS) residues. They were fermented using sewage sludge as inoculum. The co‐digestion was evaluated under mesophilic conditions for 40 days. The ratios of volatile substances of substrate / co‐substrate evaluated were 0:100; 25:75; 50:50, 75:25, and 100:0. Two substrate / inoculum ratios (SIR 1:1 and SIR1:2) were also evaluated. The results indicate that the maximum methane accumulation rate is obtained in SIR 1:1 for a VM‐AS ratio (25:75) with 540 mL/g volatile solid (VS). In general, the results did not increase with the increase in inoculum; rather, the tendency to improve methane yield is associated with an increase in the amount of agricultural residues, mainly AS. Regarding the kinetic modeling, the transfer model is the one that best adjusted the predicted values to those observed with an r2 between 0.991 and 0.999, and an RMSE value between 2.06 and 13.62 mL/g (volatile solid) VS. Finally, all the trials presented synergistic effects in their co‐digestion except the digesters formed by LM‐AS, LM‐QS and LM‐WS of SIR 1:2. These presented antagonistic effects in which the addition of the co‐substrate generated competition with the substrates, reducing methane production. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd

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Methane yields during anaerobic co-digestion of animal manure with other feedstocks: A meta-analysis

Cited by 70 publications

References 58 publications

Applying PICRUSt and 16S rRNA functional characterisation to predicting co-digestion strategies of various animal manures for biogas production

Applying PICRUSt and 16S rRNA functional characterisation to predicting co-digestion strategies of various animal manures for biogas production

Anaerobic Digestion of Animal Manure and Influence of Organic Loading Rate and Temperature on Process Performance, Microbiology, and Methane Emission From Digestates

Effect of the co‐digestion of agricultural lignocellulosic residues with manure from South American camelids

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