Abstract
This study evaluates different hydrothermal pretreatment conditions for the tomato plant. Since these plants produce abundant waste due to their lignocellulosic content, biodegradation through anaerobic digestion is difficult. Hydrothermal pretreatment of the tomato plant was carried out at different times (0, 10, 15, 20, 30, and 60 min), with pressure and temperature conditions maintained at 394 K and 202,650 total Pa. In addition, acid and base were added to determine if they favored the hydrolysis of the lignocellulosic material. After determining the most appropriate pretreatment time for the different options (with or without chemical reagent), aerobic biodegradability was evaluated, as well as the structural changes caused by the pretreatment. From this stage of pretreatment evaluation, it was concluded that the conditions of greatest interest were 15 min (t15) hydrothermal pretreatment without the addition of chemical reagents (TPWH (t15)). The anaerobic digestion process was subsequently evaluated by comparing TPWH (t15) with the untreated tomato plant, obtaining a mean value of 0.125 ± 0.006 and 0.097 ± 0.010 m3STP CH4/kg TVS (total volatile solids) (STP standard temperature and pressure conditions, 273 K and 101,325 Pa), respectively, once the methane production is stabilized.
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Abbreviations
- RM:
-
Raw material
- TPW:
-
Tomato plant waste
- TPWH:
-
Tomato plant waste hydrothermal
- TPWAH:
-
Tomato plant waste acid-hydrothermal
- TPWAlkH:
-
Tomato plant waste alkali-hydrothermal
- SOUR:
-
Specific oxygen uptake rate
- OD20 :
-
Oxygen demand
- Alk:
-
Alkalinity
- TS:
-
Total solids
- FS:
-
Fixed solids
- TVS:
-
Total volatile solids
- VA:
-
Volatile acidity
- STN:
-
Soluble total nitrogen
- STOC:
-
Soluble total organic carbon
- TOCD:
-
Total chemical oxygen demand
- N-TKN:
-
Total kjeldahl nitrogen
- TP:
-
Total phosphorus
- YCH4/S :
-
Methane yield
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Acknowledgments
The authors are very grateful to the Spanish Ministry of Economy and Competitiveness (Project CTQ2014-60050-R), Ministry of Education, Culture and Sport (Grant FPU2013). We also wish to express our gratitude to Inmaculada Bellido and María Luisa López, as well as Eduardo Espinosa and Juan Domínguez-Robles for their contribution to this research. We also thank the SCAI-UCO for the research support they provided.
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Gil, A., Siles, J.A., Gutiérrez, M.C. et al. Evaluation of physicochemical pretreatment of tomato plant for aerobic and anaerobic biodegradation. Biomass Conv. Bioref. 9, 489–497 (2019). https://doi.org/10.1007/s13399-019-00380-x
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DOI: https://doi.org/10.1007/s13399-019-00380-x