Abstract
Over the past decades, the agro-industrial by-products (AIBP) have received considerable attention. In this context, we aimed to investigate the effect of AIBP as a source of non-fiber carbohydrates on biogas production kinetic, methane emission, and fermentation characteristics. Experimental treatments were (1) sugar beet pulp (SBP) (control), (2) apple pomace (AP), (3) orange pulp (OP, (4) 33% AP + 66% OP, (5) 50% AP + 50% OP, and (6) 66% AP + 33% OP. Field emission scanning electron microscope was used to show the nano structural differences of the AIBP. Results of proximate analyzes, demonstrated significant differences of the crude protein among the treatments (P < 0.05). Biogas production and methane emission were significantly higher in SBP and OP treatments (P < 0.05). The highest and the lowest amounts of acetate were observed for AP and OP (61.84 mmol/L, 58.15 mmol/L), respectively. More broken edges were obvious in OP images. Yet, particle size was rather smaller in SBP. Images of AP showed a sleek surface which may act as a shield preventing more digestion. To conclude, utilization of AIBP, as non-fiber energy source, not only could contribute towards reducing environmental contamination but could also positively affect degradation, biogas kinetics, methane emission and in vitro fermentation parameters.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Ethical protocol was approved by the experimental animal ethics committee of University of Tabriz, Tabriz, Iran.
Abbreviations
- AIBP:
-
Agro-Industrial By-Products
- SBP:
-
Sugar beet pulp
- AP:
-
Apple pomace
- OP:
-
Orange pulp
- CP:
-
Crude protein
- EE:
-
Ether extract
- ME:
-
Metabolizable energy
- NDF:
-
Neutral detergent fiber
- ADF:
-
Acid detergent fiber
- TMR:
-
Total mixed ration
- DOM:
-
Digestible organic matter
- SCFA:
-
Short-chain fatty acid
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This research was made possible by the grants number 788 from University of Tabriz.
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SS and AT contributed to the project idea, design and execution of the study. HP, AJ, BHD, SNG, and NS were in charge of laboratory analyses. VP and SA were responsible for statistical analyses, scientific editing and finalizing the manuscript.
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Statement of novelty
Agro-industrial by-products (AIBP) contaminate the environment leading to health problems. Determining biogas production capacity of AIBP, its methane emission and fermentation characteristics can assist in designing the best bio-recycling method. With this notion, the biodegradation pattern of AIBP, as non-fiber carbohydrate source, by ruminal anaerobic microorganisms can be monitored using field emission scanning electron microscope. In this study, we studied the digestion kinetics as well as biogas production pattern of composited and non-composited AIBP.
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Shirmohammadi, S., Taghizadeh, A., Paya, H. et al. Impact of nano structure of agro-industrial by-products on biogas production kinetics and methane emission. Biomass Conv. Bioref. 13, 13785–13793 (2023). https://doi.org/10.1007/s13399-021-02094-5
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DOI: https://doi.org/10.1007/s13399-021-02094-5