Abstract
The effects of mesophilic anaerobic co-digestion (AcoD) of organic fraction of municipal solid waste (OFMSW) and sewage sludge (SS) on enhancement of biogas production were investigated under different types of sludge combinations (primary sludge PS, waste-activated sludge WAS and mixed sludge MS), varying mixing ratios of OFMSW and MS (50:50, 70:30, 80:20, 90:10, v/v) and varying total solid TS concentrations (6, 9, 12, 15%). The co-digestion of OFMSW with MS resulted in the biogas yield of 138 mL/gVS over mono-digestion of OFMSW (39 mL/gVS). Co-digestion of OFMSW + PS and OFMSW + WAS yielded biogas of 107 and 129 mL/gVS, respectively, which is less than that of OFMSW + MS (138 mL/gVS), respectively. The co-digestion of OFMSW with MS showed a 2.5 times increase in biogas yield over OFMSW digestion alone and 23% and 7% higher biogas yield than OFMSW + PS and OFMSW + WAS, respectively. The highest biogas yield of 967 mL/g VS was observed at TS concentration of 9% and OFMSW to the MS mixing ratio of 80:20, respectively. The biogas yields at different TS percentages were modelled using Gompertz and Logistic models and fitted well.
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The data and material on optimisation of anaerobic co-digestion was determined experimentally.
Abbreviations
- OFMSW:
-
Organic fraction of municipal solid waste
- PS:
-
Primary sludge
- WAS:
-
Waste-activated sludge
- MS:
-
Mixed sludge
- SS:
-
Sewage sludge
- AcoD:
-
Anaerobic co-digestion
- TS:
-
Total solid
- VS:
-
Volatile solid
- TKN:
-
Total Kjeldahl Nitrogen
- VFAs:
-
Volatile fatty acid
- VAP:
-
Value-added products
- RDF:
-
Refuse-derived fuel
- AD:
-
Anaerobic digestion
- GHG:
-
Greenhouse gas
- COD:
-
Chemical oxygen demand
- TOC:
-
Total organic carbon
- TAN:
-
Total ammonia nitrogen
- FW:
-
Food waste
- C/N:
-
Carbon to Nitrogen ratio
- F/M:
-
Food to microorganisms ratio
- WWTP:
-
Wastewater treatment plant
- CAPEX:
-
Capital expenditures
- OPEX:
-
Operational expenditure costs
- GM:
-
Gompertz Model
- LM:
-
Logistic Model
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The software used was IBM SPSS statistics 22 and MATLAB R2019b.
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Authors are thankful to the Department of Biotechnology-GoI (Grant No. BT/RLF/Re-entry/12/2016) for financial support to this research.
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Highlights
• Effect of OFMSW co-digestion with sewage sludge on biogas production improvement was studied
• Mixed sludge was the best co-substrate (with OFMSW) amongst the different sludge types studied
• Highest biogas yield was produced at OFMSW to mixed sludge ratio of 80:20
• Highest biogas yield was achieved at a total solid concentration of 9%
• Biogas yields at different TS percentage were modelled by using Gompertz Model and Logistic Model.
• Indian scenario of organic waste to biogas energy was presented.
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Ahmed, B., Tyagi, V.K., Priyanka et al. Optimization of process parameters for enhanced biogas yield from anaerobic co-digestion of OFMSW and bio-solids. Biomass Conv. Bioref. 12, 607–618 (2022). https://doi.org/10.1007/s13399-020-00919-3
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DOI: https://doi.org/10.1007/s13399-020-00919-3