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Published in: Biomass Conversion and Biorefinery 4/2022

09-06-2020 | Original Article

Anaerobic co-digestion of waste microalgal biomass with cattle dung in a pilot-scale reactor: effect of seasonal variations and long-term stability assessment

Authors: Pushpendar Kumar, Arghya Bhattacharya, Sanjeev Kumar Prajapati, Anushree Malik, Virendra Kumar Vijay

Published in: Biomass Conversion and Biorefinery | Issue 4/2022

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Abstract

The present work is first of its kind to attempt on year-round biogas production utilizing microalgal biomass from lake water. The analyses showed that the lake water contain ample nutrients (TAN: 3.6–16; TDP: 4.88–20.38 and NO3-N: 0.3–19.63 mg L−1) to support microalgal growth, with an average biomass concentration of ≈ 2.0 g L−1, throughout the year. Significant correlation (p < 0.05) was observed between microalgal biomass and nutrient concentration in the lake water. Further, co-digestion studies in the pilot-scale plant (0.5 m3) showed good performance with a volumetric and specific biogas yield in the range of 0.45 to 0.65 m3 day−1 and 0.72 to 1.04 m3 kg−1 VSfed day−1 respectively, during the summer. However, during winters, the volumetric and specific biogas yield were found to be in the range of 0.06 and 0.21 m3 day−1 and 0.096–0.336 m3 kg−1 VSfed day−1, respectively, with an average 55–65% CH4. Detailed analyses of digestate indicated long-term stability of the pilot-scale process. This study established the feasibility of utilizing waste algal biomass from eutrophic lake water for year-round biogas production.

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Appendix
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Metadata
Title
Anaerobic co-digestion of waste microalgal biomass with cattle dung in a pilot-scale reactor: effect of seasonal variations and long-term stability assessment
Authors
Pushpendar Kumar
Arghya Bhattacharya
Sanjeev Kumar Prajapati
Anushree Malik
Virendra Kumar Vijay
Publication date
09-06-2020
Publisher
Springer Berlin Heidelberg
Published in
Biomass Conversion and Biorefinery / Issue 4/2022
Print ISSN: 2190-6815
Electronic ISSN: 2190-6823
DOI
https://doi.org/10.1007/s13399-020-00778-y

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