Abstract
This study aimed to investigate the impact of dilute acid-thermal pretreatment of horse manure (HM) on the characteristic changes followed by biomethanation of untreated (control) and pretreated HM using iron oxide (Fe3O4) nanoparticles (NPs) as additives at concentrations of 20 mg/L, 40 mg/L and 60 mg/L at mesophilic (35 ± 2 °C) and thermophilic (55 ± 2 °C) temperature conditions. The acid-thermal pretreatment enabled the depolymerisation of the lignocellulosic crystalline structure of HM resulting in the reduction of cellulose and hemicellulose by 93 % and 96 % respectively. Addition of deficient or surplus concentration of NPs or micronutrients may adversely influence the activity of microbes because the release of key enzymes is ion dependant. Addition of appropriate concentration of Fe3O4 NPs facilitates the release of Fe2+ and Fe3+ ions that contribute to the release of key enzymes, but the addition of surplus concentration results in the release of reactive and toxic-free radicals or intermediates that decline the activity of the microorganisms. Results disclosed that the maximum methane yield of 0.16 L/g CODreduced and 0.175 L/g CODreduced was achieved under mesophilic and thermophilic conditions from pretreated HM with an addition of 40 mg/L of Fe3O4 NPs with a COD reduction of 68 % and 56 %, respectively, whereas it was 0.14 L/g CODreduced and 0.15 L/g CODreduced with an addition of 60 mg/L of Fe3O4 NPs with corresponding COD reduction of 58 % and 62.5 %, respectively, from untreated HM. Based on the findings achieved in the study, it is proven that the HM is a potential feedstock for biogas/methane generation. Incorporating the advanced techniques such as acid-thermal pretreatment and addition of supplements in the form of NPs further enhances the biomethanation process making it more lucrative and feasible for implementation at full scale.
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Acknowledgements
The authors are grateful to the Director (IICT/Pubs./2019/417), Council of Scientific and Industrial Research (CSIR)-Indian Institute of Chemical Technology (IICT), Department of Science and Technology (DST) and Department of Biotechnology (DBT), GoI towards financial support and continuous encouragement to carry out this research work.
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Highlights
• Biomethanation of horse manure using nanoparticles and acid-thermal pretreatment.
• Addition of Fe3O4 NPs shortened the batch residence time at thermophilic condition.
• Ninety percent destruction of lignocelluloses in horse manure (HM) due to pretreatment.
• Addition of 40 mg/L of NPs is ideal for untreated HM, while 60 mg/L for pretreated.
• Improved methane yield and COD reduction under mesophilic and thermophilic conditions.
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Juntupally, S., Arelli, V., Begum, S. et al. Improved biomethanation of horse manure through acid-thermal pretreatment and supplementation of iron nanoparticles under mesophilic and thermophilic conditions. Biomass Conv. Bioref. 12, 2993–3006 (2022). https://doi.org/10.1007/s13399-020-01085-2
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DOI: https://doi.org/10.1007/s13399-020-01085-2