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Substituting microalgae with fecal sludge for biohythane production enhancement and cost saving through two-stage anaerobic digestion.
- Source :
-
Journal of Cleaner Production . Nov2023, Vol. 427, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Finding a low-cost, simple technology for producing high-quality bioenergy (e.g., biohythane: bioH 2 and bioCH 4) from waste biomass is challenging. Production of cleaner energy, such as biohythane, than methane from microalgae (MA), is a suitable approach. However, having a low C-N ratio of microalgae limits scaling up the process. Therefore, this study took the opportunity to use fecal sludge (FS) as a co-substrate for C-N ratio optimization to improve biohythane production while reducing cost. The biomass hydrothermal pretreatment enhanced soluble chemical oxygen demand (sCOD) from 390 mgL−1 to 1085 mgL−1, resulting volatile fatty acid (VFA) accumulation rate of 1853 mgL−1 at a mixing ratio of 50:50. The results of two-stage anaerobic digestion (TSAD) of 50-50 MA-FS showed a cumulative biohydrogen yield of 24.5 mLg−1-VS (Volatile Solid) and biomethane yield of 281 mLg−1-VS with a synergetic effect of 52.7%. The techno-economic analysis suggests a return on investment (ROI) of 4.8 for utilizing a 50-50 biomass ratio. In addition, the input cost could be reduced to 75.6 % if the ratio of MA and FS was adjusted to 25–75. Therefore, the TSAD of MA and FS is a promising option to enhance the biohythane yield and its high economic potential. [Display omitted] • Microalgae-fecal sludge co-fermentation optimized C/N ratio and improved hydrogen production. • Microalgae-fecal sludge co-digestion improved biomethane production by 24% compared to microalgae. • Algae-sludge 50-50 mixing ratio exhibited 52.7% synergetic effect. • Return on investment (ROI) 5.8 for utilizing a 50-50 biomass ratio. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09596526
- Volume :
- 427
- Database :
- Academic Search Index
- Journal :
- Journal of Cleaner Production
- Publication Type :
- Academic Journal
- Accession number :
- 173234671
- Full Text :
- https://doi.org/10.1016/j.jclepro.2023.139352