Gezahegn, A and Selassie, Y G and Agegnehu, G and Addisu, S and Mihretie, F A and Kohira, Y and Sato, S (2024) Pyrolysis temperature changes the physicochemical characteristics of water hyacinth-based biochar as a potential soil amendment. Biomass Conversion and Biorefinery. ISSN 2190-6815
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Temperature greatly determines biochar’s physicochemical characteristics during the pyrolysis of a biowaste. This study aimed to investigate how pyrolysis temperature alters the physicochemical characteristics of water hyacinth (WH) biochar as a soil amendment. WH biomass was slowly pyrolyzed at three temperatures (350, 550, and 750 °C) for 2 h. Results show that biochar yield lessened from 51.0 to 33.3% with a temperature rise. When pyrolysis temperature increased biochar’s pH (9.24–11.2), electrical conductivity (28.0–44.7 mS cm−1), liming capacity (17.7–33.0% CaCO3 equivalence), ash content (33.3–52.4%), available nutrients (Ca, Mg, K, P), surface area (1.1–29.8 m2 g−1), pore volume, C/N ratio (15.9–20.3), and water holding capacity increased. However, C, H, N, H/C (0.89–0.11) and O/C (0.62–0.49) ratios, cation exchange capacity (CEC) (44.4–2.3 cmol+kg−1), and pore width decreased. Surface functional groups shrank when pyrolysis temperature increased. As the temperature rises, WH biochar becomes structured, porous, and recalcitrant. All WH biochar samples show high alkalinity, particularly developed at 550 °C and 750 °C could replace liming materials in soil acidity alleviation. Biochar produced at 350 °C and 550 °C could improve agricultural soil fertility and nutrient retention capacity due to the lower C/N ratio, high N content, and CEC. Biochar produced at 550°C and 750 °C can sequester carbon in the soil. Biochar developed at 750 °C be applied to amend soil physical properties due to its comparably high surface area and porosity. Hence, the thermal conversion of WH biowaste to biochar helps obtain suitable biochar properties for soil amendment.
| Item Type: | Article |
|---|---|
| Divisions: | Research Program : East & Southern Africa |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | Aquatic weed, Lake Tana, Waste management, Biochar, Soil fertility |
| Subjects: | Others > Soil Fertility |
| Depositing User: | Mr Nagaraju T |
| Date Deposited: | 20 Jun 2024 10:03 |
| Last Modified: | 20 Jun 2024 10:03 |
| URI: | http://oar.icrisat.org/id/eprint/12713 |
| Official URL: | https://link.springer.com/article/10.1007/s13399-0... |
| Projects: | Plankton Ecoengineering for Environment and Economic Transformations project, Project for Eco-Engineering for Agricultural Revitalization toward Improvement of Human Nutrition/EARTH: Water Hyacinth to Energy and Agricultural Crops |
| Funders: | MEXT/Japan, Japan Science and Technology Agency/JST, Japan International Cooperation Agency/JICA |
| Acknowledgement: | Professor Shinjiro Sato’s lab members from the Faculty of Science and Engineering at Soka University, Japan, who helped with the biochar analysis, are highly acknowledged by the authors. The Ethiopian Lake Tana and Other Water Bodies Authority is dully acknowledged for granting access to the water hyacinth at Lake Tana. |
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