Micro-Aerobic Pre-Treatment vs. Thermal Pre-Treatment of Waste Activated Sludge for Its Subsequent Anaerobic Digestion in Semi-Continuous Digesters: A Comparative Study
Abstract
:1. Introduction
2. Material and Methods
2.1. Micro-Aerobic Pre-Treatment
2.2. Experimental Set-Up, Substrate, and Inoculum
2.3. Analytical Methods and Statistical Analysis
2.4. Energy Demand Analysis
3. Results and Discussion
3.1. Micro-Aerobic Pre-Treatment of Waste Activated Sludge
3.2. Anaerobic Digestion of Pre-Treated Sludge
3.3. Energy Requirements Analysis
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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TS g L−1 | TSS g L−1 | VSS g L−1 | sCOD gO2 L−1 | Soluble Proteins mg L−1 | ||
---|---|---|---|---|---|---|
R1 | Inoculum (LA1) | 28.3 | 25.4 | 17.5 | 3.0 | - |
LM1 (40%WAS, 60% Primary sludge) | 42.6 | 38.2 | 30.2 | 11.7 | 48.8 | |
R2 | Inoculum (LA2) | 33.7 | 29.7 | 20.1 | 8.1 | - |
LM2 (40% Thermally pre-treated WAS, 60% Primary sludge) | 49.7 | 43.8 | 33.3 | 28.5 | 342.5 | |
R3 | Inoculum (LA1) | 28.3 | 25.4 | 17.5 | 3.0 | - |
LM3 (40% Micro-aerobically pre-treated WAS, 60% Primary sludge) | 38.2 | 36.4 | 29.0 | 22.5 | 403.6 |
Parameters | Waste Activated Sludge | Micro-Aerobically Pre-Treated Waste Activated Sludge | Increase or Decrease (%) |
---|---|---|---|
TS g L−1 | 40.52 | 35.67 | −11.97 |
VS g L−1 | 34.57 | 29.48 | −14.74 |
VSS g L−1 | 33.01 | 28.32 | −14.21 |
Ashes g L−1 | 5.95 | 6.19 | +4.12 |
tCOD gO2 L−1 | 113.07 | 105.49 | −6.71 |
sCOD gO2 L−1 | 21.35 | 29.64 | +38.80 |
Soluble proteins mg L−1 | 343.23 | 451.70 | +31.60 |
TAN g L−1 | 1.34 | 1.73 | +29.38 |
sCOD Obtained at the Outlet (g L−1) | |||
---|---|---|---|
HRT 20 Days | HRT 15 Days | HRT 10 Days | |
R1 | 7.99 ± 0.36 | 8.19 ± 0.45 | 9.41 ± 0.57 |
R2 | 11.72 ± 0.70 | 12.28 ± 0.39 | 18.18 ± 0.41 |
R3 | 6.2 ± 0.62 | 7.87 ± 0.54 | 13.17 ± 0.56 |
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Castillo, A.; Ortega-Martínez, E.; Pagés-Díaz, J.; Montalvo, S.; Huiliñir, C. Micro-Aerobic Pre-Treatment vs. Thermal Pre-Treatment of Waste Activated Sludge for Its Subsequent Anaerobic Digestion in Semi-Continuous Digesters: A Comparative Study. Fermentation 2022, 8, 565. https://doi.org/10.3390/fermentation8100565
Castillo A, Ortega-Martínez E, Pagés-Díaz J, Montalvo S, Huiliñir C. Micro-Aerobic Pre-Treatment vs. Thermal Pre-Treatment of Waste Activated Sludge for Its Subsequent Anaerobic Digestion in Semi-Continuous Digesters: A Comparative Study. Fermentation. 2022; 8(10):565. https://doi.org/10.3390/fermentation8100565
Chicago/Turabian StyleCastillo, Alejandra, Eduardo Ortega-Martínez, Jhosané Pagés-Díaz, Silvio Montalvo, and Cesar Huiliñir. 2022. "Micro-Aerobic Pre-Treatment vs. Thermal Pre-Treatment of Waste Activated Sludge for Its Subsequent Anaerobic Digestion in Semi-Continuous Digesters: A Comparative Study" Fermentation 8, no. 10: 565. https://doi.org/10.3390/fermentation8100565