A Review on Start-Up Phase Optimization of Kitchen Waste Anaerobic Digestion
Abstract
:1. Introduction
2. Factors Affecting Anaerobic Digestion Start-Up
2.1. Temperature
2.2. pH and Substrate
2.3. Organic Loading Rate
2.4. Inoculum and Inoculation Ratio
2.5. Trace Elements
3. Methods to Accelerate the Start-Up Phase
- A short lag time before methane production.
- A significant methane production rate (>0.2 L/L/d) after the lag time.
- The presence of acetate-utilizing or hydrogen-utilizing MPA.
3.1. Substrate Pretreatment
- (i)
- to improve surface performance for the sake of achieving better microbial interaction reaction efficiency;
- (ii)
- to reduce/remove toxic and harmful compounds that are detrimental to the process;
- (iii)
- to improve the kinetics of the rate of hydrolysis of proteins and lipids;
- (iv)
3.1.1. Single Pretreatment
Pretreatment Type | Pretreatment Conditions | Temperature | pH | Treatment Effect | Start-Up Time (d) | Reference |
---|---|---|---|---|---|---|
Freeze/thaw | Freeze for 24 h; thaw 12 h; the duration is 0.5 to 30 min | −20 °C/25 °C | 7.2 | Methane production increased by 6.7%; batch operation time is reduced by 42%; hydrogen production rate increased by 127% | 8 | [69] |
Hydrothermal | 6.2 bar | 160 °C | 7.3~7.6 | Methane production is increased by 5–10% | 10 | [70] |
Hydrothermal | 140 °C for 60 min | 140 °C | 7.96 | Methane yield increased by 27.78% | 11 | [71] |
Ultrasonic | Sonication time is 24 min/d; HRT is 2 d; 20 kHz | 37 °C | 6.9~7.2 | The removal rate of VS was 67%; Methane production rate increased by 100% | 15 | [72] |
Ultrasonic | 250 W for 40 min; 50 d | 37 °C | 6.9~7.4 | Cumulative gas production increased by 42.6%; methane content increased to 58.8%; biodegradation rate increased to 73.5%. | 10 | [73] |
Microwave | 3.9 and 1.9/min; 175 °C for 1 min | 33 ± 2 °C | - | Average gas production increased by 16% | 30 | [74] |
Aeration | 37.5 mL O2/LR-d; 4 day; 5 L/h for 24 h | 35 °C | 5.2~7.0 | Cumulative methane production increased by 21%; methane production increased by 45.6% | 25 | [75] |
Acid/alkali | 4 mol/L NaOH/HCl; pH (2–13) | 35 °C | - | The hydrogen production rate of the acid pretreatment and alkali pretreatment increased by 21% and 480%, respectively | - | [76] |
Alkali | 121 °C for 15 min; 4 mol/L NaOH/HCl | 35 ± 1 °C | 7.5 | The hydrogen production rate increased by 266% when the pH was 13 | 20 | [77] |
Bio-enzyme | 45 °C for 24 h; 6 days at 30 °C | 60 °C | 4.0~4.5 | The rate of methane production increased by 350%; VS removal rate was 80.5% | 24 | [78] |
3.1.2. Combined Pretreatment
3.2. Type of Inoculum
3.3. Optimization of Operating Conditions
3.3.1. Warming-Up Strategy
3.3.2. Stirring Method
3.3.3. Co-Digestion
Co-Digestible Mass Ratio | Operation Mode | Temperature (°C) | pH | Maximum Methane Yield (mL CH4/g VS) | Start-Up Duration (d) | Reference |
---|---|---|---|---|---|---|
Sewage sludge: KW = 1:1 | Batch assay | 35 ± 1 | 7.07~7.27 | 251 | 12 | [103] |
Cow manure: KW = 1:2.5 | Semi-continuous | 39 | 7.63~7.67 | 441 | 13 | [100] |
Chicken manure: KW = 1:1 | Semicontinuous | 55 | - | 136 | - | [104] |
KW: Yard waste: Waste activated sludge = 0.8:1.7:0.5 | Semi-continuous | 35 | 6.74~6.98 | 149 | 28 | [105] |
Maize straw silage: KW = 1:9 | Semi-continuous | 35 | 7.25~7.55 | 613 | 30 | [106] |
Livestock manure: KW = 3:1 | Batch assay | 37 | 6.50~7.00 | 250 | 18 | [107] |
Excess sludge: KW = 1:4 | Continuous | 35 | 7.17~7.77 | 274 | 12 | [108] |
Sewage sludge: KW = 1:1 | Semi-continuous | 37 ± 1 | 7.00~7.50 | 402 | 6 | [109] |
Cattle manure: KW = 1:3 | Batch assay | 35 ± 1 | 7.20~7.30 | 233 | 7 | [110] |
Wastewater sludge: KW = 1:1 | Semi-continuous | 35 ± 1 | 6.00~7.00 | - | 10 | [111] |
3.4. Exo-Conductive Material
3.4.1. Mechanisms of Electron Transfer
3.4.2. Carbon-Based Additives
3.4.3. Metal Cations
3.5. Combination of Methods
4. Conclusions
- (1)
- In general, a KW AD system starts faster and more stably under the following parameters: under mesophilic conditions, pH is controlled around 7.0, OLR ranges from 2.0 to 4.5 kg COD/m3·d and the inoculation ratio is higher than 1.5. In addition, the metal ion concentration should be strictly controlled to maintain the stability of the bioreactor.
- (2)
- On the other hand, utilizing KW as the only substrate for long-term AD reactor operation may generate a slow start-up, so it can be considered to add livestock manure or residual sludge for co-digestion, or to add exogenous conductive materials to enhance the DIET and microbial methanogenic activity to accelerate the start-up phase.
5. Prospects and Challenges
- (1)
- A dry AD reactor for FW biodegradation has been shown to exhibit better performance under thermophilic conditions. However, the optimal start-up temperature for wet AD has not been concluded yet, which needs further studies.
- (2)
- The addition of multiple metal elements can reduce the lag time of the AD start-up phase. Yet, it is unconclusive to the effect of co-precipitation and adsorption between different metals on DIET.
- (3)
- The AD process of KW can be affected by diverse factors, and a variety of methods are derived to accelerate the start-up phase of the reaction. Nevertheless, which method is the most efficient and economical remains to be explored.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Exogenous Material | Concentration (g/L) | Substrate | Temperature (°C) | Increase in CH4 Production Rate (%) | Start-Up Duration (d) | Reduction in CH4 Lag Phase (%) | Reference |
---|---|---|---|---|---|---|---|
Granular activated carbon | 25.0 | KW | 37 | 26.10 | 12 | 29.40 | [130] |
Granular activated carbon | 10.0 | KW | 37 | 10.10 | 15 | 80.00 | [131] |
Nickel-containing activated carbon | 10.0 | KW | 35 | 50.00 | 20 | 67.00 | [132] |
Sawdust biochar | 8.3 | KW | 35 | 41.60 | 16 | 45.00 | [133] |
Coconut shell biochar | 22.1 | KW | 35 | 18.50 | 21 | 66.60 | [134] |
Fe–metal organic frameworks (Fe–MOF) | 0.2 | KW | 36 | 44.27 | 18 | 49.20 | [135] |
Sawdust biochar | 10.0 | KW and WAS | 55 | 21.20 | 13 | 95.70 | [136] |
Microscale zero-valent iron | 10.0 | KW and WAS | 35 ± 1 | 20.05 | 15 | 46.44 | [137] |
Fe2O3 | 0.2 | Pennisetum, KW | 37 ± 1 | 23.50 | 14 | - | [138] |
Fe3O4 | 0.2 | Pennisetum, KW | 37 ± 1 | 37.90 | 10 | - | [138] |
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Yan, Y.-J.; Li, X.; Lu, C.-S.; Kobayashi, T.; Zhen, G.-Y.; Hu, Y. A Review on Start-Up Phase Optimization of Kitchen Waste Anaerobic Digestion. Fermentation 2023, 9, 603. https://doi.org/10.3390/fermentation9070603
Yan Y-J, Li X, Lu C-S, Kobayashi T, Zhen G-Y, Hu Y. A Review on Start-Up Phase Optimization of Kitchen Waste Anaerobic Digestion. Fermentation. 2023; 9(7):603. https://doi.org/10.3390/fermentation9070603
Chicago/Turabian StyleYan, Yi-Juan, Xiang Li, Chen-Shun Lu, Takuro Kobayashi, Guang-Yin Zhen, and Yong Hu. 2023. "A Review on Start-Up Phase Optimization of Kitchen Waste Anaerobic Digestion" Fermentation 9, no. 7: 603. https://doi.org/10.3390/fermentation9070603