Impact of iron nanoparticles on biogas production and effluent chemical composition from anaerobic digestion of cattle m
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ORIGINAL ARTICLE
Impact of iron nanoparticles on biogas production and effluent chemical composition from anaerobic digestion of cattle manure Taha Abdelfattah Mohammed Abdelwahab 1 Debaraj Behera 1
&
Mahendra Kumar Mohanty 1 & Pradeepta Kumar Sahoo 1 &
Received: 17 June 2020 / Revised: 12 August 2020 / Accepted: 26 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Many nanoparticles (NPs) were reported to enhance biogas production from anaerobic digestion (AD) of organic wastes. However, the influence of iron (Fe) NPs on processes stability of AD of cattle manure and effluent chemical composition has not yet been studied in depth. Therefore, three concentrations (15, 30, and 60 mg/L) of Fe NPs were added to the separate labscale batch bio-digester to investigate their impact on biogas production and effluent chemical composition from the AD of cattle manure compared with cattle manure only. The results indicated that the highest specific biogas production (p < 0.05) was attained with 15 mg/L Fe NPs and was 953.41 mL biogas/g VS compared with cattle manure only which produce only 589.2 mL biogas/g VS. The addition of 30 mg/L Fe NPs increased the specific methane (CH4) production (p < 0.05) by 118.8% compared with cattle manure only. Moreover, the rate of hydrogen sulfide (H2S) production was also reduced (p < 0.05) by 81%, 93%, and 110% using the 15, 30, and 60 mg/L Fe NPs, respectively, compared with cattle manure only. Further investigations confirmed that the addition of 15 mg/L Fe NPs maintained pH 6.9 and improved total and volatile solids removal efficiencies by 25.6% and 10.9%, respectively; this concentration of Fe NPs produced the highest concentration of volatile fatty acids (VFAs) and was 4050 mg/L and increases sulfide content by 12%. FTIR spectrum of effluent presented the addition of Fe NPs change the intensity and shift of peaks compared with cattle manure–only peak.
Keywords Anaerobic digestion stability . Biogas . Cattle manure . Chemical composition . Anaerobic effluent . Iron nanoparticles
Highlights • The effects of Fe NPs on processes stability of AD of cattle manure and effluent chemical composition were studied. • The highest specific biogas production was 953.41 mL biogas/g VS with Fe NPs 15 mg/L, increasing by 61.8%. • Methane production was increased in the presence of Fe NPs up to 118.8%. • Removal efficiencies of H2S increased in the presence of Fe NPs up to 52.5%. • The addition of 15 mg/L Fe NPs maintained pH at a suitable level, enhanced the degradation of TS and VS, and promoted VFAs generated during AD of cattle manure. * Taha Abdelfattah Mohammed Abdelwahab [email protected] * Mahendra Kumar Mohanty [email protected] 1
Department of Farm Machinery & Power, College of Agricultural Engineering & Technology (CAET), Odisha University of Agriculture & Technology (OUAT), Bhubaneswar, Odisha 751003, India
1 Introduction Energy is the backbone of developing countries like India [1]. One of the great technological challenges in the twen
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