Characterization of biochar prepared from biogas digestate
| Autor: | Wen-Tien Tsai, Jie-Wei Chen, Yu-Quan Lin, Yuan-Ming Chang, Chao-Yi Hung |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Waste management
Chemistry 020209 energy Thermal decomposition Temperature 02 engineering and technology 010501 environmental sciences Raw material 01 natural sciences law.invention X-Ray Diffraction Chemical engineering law Biofuels Charcoal Biochar Digestate 0202 electrical engineering electronic engineering information engineering Calcination Heat of combustion Particle density Waste Management and Disposal Pyrolysis 0105 earth and related environmental sciences |
| Zdroj: | Waste Management. 66:53-60 |
| ISSN: | 0956-053X |
| DOI: | 10.1016/j.wasman.2017.04.034 |
| Popis: | In the study, the biogas digestate was evaluated as a potential feedstock for preparing biochars at a broad temperature range of 300-900°C. The physico-chemical and pore properties of the resulting biochars (denoted as SDBC, solid digestate biochar), including calorific value (higher heating value), surface area/pore volume/pore size distribution, true density, scanning electron microscopy - energy dispersive X-ray spectroscopy (SEM-EDS) and X-ray powder diffraction (XRD), were studied. It was found that the higher heating values of the SDBC products were on a decreasing trend as pyrolysis temperature increased, but they indicated an increase in true density. The results are probably associated with the active pyrolysis of the lignocellulosic fragments and the calcination (or shrinkage) processes, thus resulting in the increased contents of aromatic carbon clusters and main mineral constituents remained. Based on the pore properties, pyrolysis temperature at around 800°C seemed to be the optimal condition for producing SDBC, where its Brunauer-Emmet-Teller (BET) surface area (>100m2/g) largely increased as compared to that of the digestate feedstock ( 700°C) due to the high aromaticity via the thermal decomposition of lignocelluloses and the volatilization of inorganic minerals. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect