Monitoring of Food Waste Anaerobic Digestion Performance: Conventional Co-Substrates vs. Unmarketable Biochar Additions
Abstract
:1. Introduction
2. Overall Concept
3. Materials and Methods
3.1. Substrate Selection
3.2. Samples and Inoculum Preparation
3.3. Experimental Setup
- R1: 100% FW;
- R2: 60% FW+ 20% CM+ 20% WS (w/w);
- R3: 90% FW+ 10% UBc (w/w);
3.4. Analytical Methods
3.5. Statistical Analysis
4. Results and Discussion
4.1. Properties of the Raw Material
4.2. Effect of Co-Substrate Addition on Startup Conditions of FW-ACoD
4.3. Effect of Co-Substrate Addition on ACoD Performance under Variable OLRs
4.3.1. Early Warning Indicators for FW-ACoD Monitoring under Variable OLRs: Specific Biogas Yields vs. VFAs, Alkalinity, and VFAs: TAC Ratio
4.3.2. Early Warning Indicators for FW-ACoD Monitoring under Variable OLRs: Specific Methane Yields vs. pH Fluctuations
4.3.3. Co-Substrate Addition Effects on Digestate Characteristics
5. Conclusions and Perspectives
- A roadmap is definitely required to highlight the accessibility of the selected co-substrates;
- An in-depth review of various indicators such as socio-economic and environmental aspects is obligatory;
- Appropriate biogas and/or composting plant design (in terms of capacity, OLR, HRT, cost, etc.) is mandatory to optimize energy and compost use.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Phase | Feeding of Digesters | Organic Loading Rate (kg VS/m3·d) | Period (Days) | ||
---|---|---|---|---|---|
R1: FW | R2: FW:CM:WS | R3: FW:UBc | |||
Phase I | + | + | + | 2 | 1–61 |
Phase II | + | + | + | 2.5 | 62–92 |
− | + | + | 3 | 93–123 | |
− | + | + | 3.5 | 124–154 | |
− | + | + | 4 | 155–185 | |
− | − | + | 4.5 | 186–216 |
Parameters | Units | Method of Analysis | Reference |
---|---|---|---|
pH | - | (1:10 w/v sample: water extract) | ISO 10390 (1994) |
Moisture content (MC) | % of FM 1 | Using electronic oven by drying at 105 °C for 24 h | NF ISO 11465 (1994) |
Total solids (TS) | % of FM 1 | ||
Total carbon (TC) | % of FM 1 | TOC (%) = ((100 − Ash%) ÷ 1/8) | [44] |
Total nitrogen (TN) | % of FM 1 | Titrimetric methods | NF ISO 11265 (1995) |
Phosphorus (P) | % of TS 2 | Atomic absorption spectrometric methods | ISO 11885 (2007) |
Potassium (K) | % of TS 2 | ||
Magnesium (Mg) | % of TS 2 | Spectrometer, Thermo-Elemental ICP MS-X Series | ISO 11885 (2007) |
Lead (Pb) | mg/kg TS | Spectrometer, Thermo-Elemental ICP MS-X Series | ISO 11885 (2007) |
Copper (Cu) | mg/kg TS | Spectrometer, Thermo-Elemental ICP MS-X Series | ISO 11885 (2007) |
Zinc (Zn) | mg/kg TS | Spectrometer, Thermo-Elemental ICP MS-X Series | ISO 11885 (2007) |
Nickel (Ni) | mg/kg TS | Spectrometer, Thermo-Elemental ICP MS-X Series | ISO 11885 (2007) |
Cadmium (Cd) | mg/kg TS | Spectrometer, Thermo-Elemental ICP MS-X Series | ISO 11885 (2007) |
Arsenic (As) | mg/kg TS | Spectrometer, Thermo-Elemental ICP MS-X Series | ISO 11885 (2007) |
Parameters | Units | FW | UBc | CM | WS |
---|---|---|---|---|---|
pH | - | 4.22 | 10.21 | 8.01 | - |
Conductivity (EC) | (mS/cm) | 5.71 | 12.73 | - | - |
Total solids | % of 1 FM | 26.00 | 97.60 | 7.10 | 91.10 |
Volatile solids | % of 2 TS | 94.60 | 83.00 | 80.30 | 86.80 |
Carbon (C) | % of FM | 20.52 | 52.47 | 42.61 | 47.63 |
Nitrogen (N) | % of FM | 1.20 | - | 1.70 | 0.61 |
C:N ratio | - | 17.10 | - | 25.64 | 78.08 |
Phosphorous (P) | % of TS | 0.48 | 0.27 | 0.60 | 0.06 |
Potassium (K) | % of TS | 0.91 | 5.21 | 2.95 | 1.74 |
Magnesium (Mg) | % of TS | 0.09 | 2.92 | 2.82 | 0.25 |
Calcium (Ca) | % of TS | 0.06 | 0.57 | 0.61 | 0.07 |
Lead (Pb) | mg/kg TS | 0.91 | 1.10 | 0.85 | 0.21 |
Copper (Cu) | mg/kg TS | 6.82 | 9.86 | 18.20 | 1.78 |
Zinc (Zn) | mg/kg TS | 16.33 | 8.10 | 131.00 | 16.6 |
Nickel (Ni) | mg/kg TS | 0.95 | 9.34 | 6.91 | 5.78 |
Cadmium (Cd) | mg/kg TS | 0.07 | <0.01 | 0.19 | 0.08 |
Chrome (Cr) | mg/kg TS | 2.31 | 67.80 | - | 10.50 |
Arsenic (As) | mg/kg TS | 0.57 | 0.41 | 0.28 | 0.07 |
Mercury (Hg) | mg/kg TS | <0.01 | 0.03 | <0.01 | <0.01 |
Feedstock | OLR (kg VS/m3·d) | VFA (mg/L) | TAC (mg CaCO3/L) | VFA: TAC |
---|---|---|---|---|
R1: FW100 | 2.0 | a 1562.06 ± 212.01 | a 9466.06 ± 2769.74 | a 0.17 ± 0.04 |
2.5 | b 2461.63 ± 456.42 | b 4212.04 ± 618.71 | b 0.60 ± 0.18 | |
3.0 | b 3415.25 ± 529.02 | b 2167.75 ± 968.42 | b 1.89 ± 0.98 | |
3.5 | - | - | - | |
4.0 | - | - | - | |
4.5 | - | - | - | |
R2: FW60CM20WS20 | 2.0 | a 1907.06 ± 264.84 | a 9950.13 ± 3322.24 | a 0.21 ± 0.07 |
2.5 | b 2151.88 ± 250.88 | b 5320.75 ± 769.86 | b 0.38 ± 0.03 | |
3.0 | b 2369.20 ± 118.72 | b 4995.45 ± 506.66 | b 0.47 ± 0.01 | |
3.5 | b 2761.30 ± 217.08 | b 4112.56 ± 277.58 | b 0.67 ± 0.04 | |
4.0 | b 2999.00 ± 320.04 | b 3575.63 ± 854.06 | b 0.89 ± 0.28 | |
4.5 | - | - | - | |
R3: FW90UBc10 | 2.0 | a 1840.38 ± 230.67 | a 10207.44 ± 2531.58 | a 0.19 ± 0.03 |
2.5 | b 2050.50 ± 258.47 | b 7065.13 ± 228.16 | b 0.29 ± 0.04 | |
3.0 | b 2035.00 ± 55.92 | b 7191.50 ± 451.52 | b 0.28 ± 0.01 | |
3.5 | b 2028.75 ± 257.46 | b 6068.00 ± 348.09 | b 0.34 ± 0.04 | |
4.0 | b 3115.00 ± 932.08 | b 5842.50 ± 398.62 | b 0.53 ± 0.13 | |
4.5 | b 4051.25 ± 276.52 | b 3351.00 ± 437.15 | b 1.21 ± 0.26 |
Feedstock | OLR (kg VS/m3·d) | pH | SMY (LN/kg VSin) | % CH4 |
---|---|---|---|---|
R1: FW100 | 2.0 | a 7.31 ± 0.61 | a 150.63 ± 31.39 | a 57.02 ± 5.54 |
2.5 | b 7.05 ± 0.75 | b 135.56 ± 25.31 | b 58.15 ± 5.41 | |
3.0 | b 6.22 ± 0.35 | b 57.42 ± 24.51 | b 34.66 ± 9.64 | |
3.5 | - | b 23.54 ± 4.21 | - | |
4.0 | - | - | - | |
4.5 | - | - | - | |
R2: FW60 CM20WS20 | 2.0 | a 7.37 ± 0.41 | a 233.03 ± 15.61 | a 61.99 ± 2.18 |
2.5 | b 7.28 ± 0.49 | b 294.92 ± 24.96 | b 65.56 ± 1.64 | |
3.0 | b 7.04 ± 0.36 | b 282.22 ± 74.09 | b 64.67 ± 4.39 | |
3.5 | b 6.70 ± 0.12 | b 151.36 ± 21.93 | b 55.09 ± 2.27 | |
4.0 | b 6.05 ± 0.17 | b 47.95 ± 20.93 | b 29.27 ± 5.61 | |
4.5 | - | b 20.60 ± 3.85 | - | |
R3: FW90UBc10 | 2.0 | a 7.91 ± 0.20 | a 208.28 ± 34.73 | a 66.49 ± 2.23 |
2.5 | b 7.86 ± 0.20 | b 279.93 ± 16.92 | b 71.08 ± 1.51 | |
3.0 | b 7.90 ± 0.29 | b 305.04 ± 12.02 | b 70.63 ± 4.04 | |
3.5 | b 7.49 ± 0.39 | b 352.02 ± 10.97 | b 72.37 ± 2.28 | |
4.0 | b 8.16 ± 0.28 | b 289.71 ± 41.51 | b 64.49 ± 2.64 | |
4.5 | b 7.14 ± 0.43 | b 137.52 ± 34.57 | b 48.42 ± 3.77 |
Parameters | Units | D1 | D2 | D3 |
---|---|---|---|---|
pH | - | 7.67 | 7.79 | 8.53 |
Conductivity (EC) | mS/cm | 5.23 | 6.12 | 11.72 |
Moisture content (MC) | % of 1 FM | 97.50 | 97.60 | 97.30 |
Crude ash | % of 2 TS | 32.30 | 36.40 | 44.10 |
Carbon (C) | % of FM | 40.10 | 35.20 | 47.60 |
Nitrogen (N) | % of FM | 4.70 | 3.70 | 3.20 |
C:N ratio | - | 8.53 | 9.51 | 14.88 |
Phosphorous (P) | % of TS | 3.87 | 4.17 | 4.91 |
Potassium (K) | % of TS | 5.21 | 5.04 | 11.86 |
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Chaher, N.E.H.; Nassour, A.; Hamdi, M.; Nelles, M. Monitoring of Food Waste Anaerobic Digestion Performance: Conventional Co-Substrates vs. Unmarketable Biochar Additions. Foods 2021, 10, 2353. https://0-doi-org.brum.beds.ac.uk/10.3390/foods10102353
Chaher NEH, Nassour A, Hamdi M, Nelles M. Monitoring of Food Waste Anaerobic Digestion Performance: Conventional Co-Substrates vs. Unmarketable Biochar Additions. Foods. 2021; 10(10):2353. https://0-doi-org.brum.beds.ac.uk/10.3390/foods10102353
Chicago/Turabian StyleChaher, Nour El Houda, Abdallah Nassour, Moktar Hamdi, and Michael Nelles. 2021. "Monitoring of Food Waste Anaerobic Digestion Performance: Conventional Co-Substrates vs. Unmarketable Biochar Additions" Foods 10, no. 10: 2353. https://0-doi-org.brum.beds.ac.uk/10.3390/foods10102353