| Title | Energy-saving drying strategy of spent coffee grounds for co-firing fuel by adding biochar for carbon sequestration to approach net zero |
|---|---|
| ID_Doc | 13056 |
| Authors | Lee, KT; Tsai, JY; Hoang, AT; Chen, WH; Gunarathne, DS; Tran, KQ; Selvarajoo, A; Goodarzi, V |
| Title | Energy-saving drying strategy of spent coffee grounds for co-firing fuel by adding biochar for carbon sequestration to approach net zero |
| Year | 2022 |
| Published | |
| Abstract | Drying is an important but energy-intensive industrial process, while spent coffee grounds can be used as an abundant and potential biomass waste to replace part of the coal consumption for green fuel production and circular economy. In this study, an energy-saving strategy for efficiently drying spent coffee grounds (SCGs) by adding hygroscopic water chestnut shell biochar with 422% water holding capacity is developed. It is found that the contributions of the thermal conductivity and hygroscopicity of the biochar on the moisture removal of the SCG exhibit a competitive relationship. The hygroscopicity is dominant when the drying temperature is below 50 degrees C, whereas the thermal conductivity reigns over the drying process once the drying temperature is equal to or above 50 degrees C. To prevent mildew growth with lower drying cost at 105 degrees C, the optimum trade-off outcomes of CSCG (i.e., the mixture of SCG and biochar) are the moisture content, water activity, and HHV of 21.71%, 0.60 aw, and 18.88 MJ kg-1, respectively. The S/C mixing ratio of 1 at 105 degrees C and around 20% moisture content has the lowest drying cost of 2.3 x 10-5 USD g-1, which reduces 44% cost compared to SCG with the same conditions. Overall, it was demonstrated that water chestnut shell biochar is a good additive to achieve the energysaving drying process of SCG, and the dried SCG can be used as a coal co-firing fuel. |
Similar Articles
| ID | Score | Article |
|---|---|---|
14387
|
Lee, KT; Du, JT; Chen, WH; Ubando, AT; Lee, KT Green additive to upgrade biochar from spent coffee grounds by torrefaction for pollution mitigation(2021) | |
| 13429
|
Chen, WH; Du, JT; Lee, KT; Ong, HC; Park, YK; Huang, CC Pore volume upgrade of biochar from spent coffee grounds by sodium bicarbonate during torrefaction(2021) | |
| 9150
|
del Pozo, C; Rego, F; Yang, Y; Puy, N; Bartrolí, J; Fàbregas, E; Bridgwater, AV Converting coffee silverskin to value-added products by a slow pyrolysis-based biorefinery process(2021) | |
| 28731
|
Zhang, X; Su, PJ; Wang, WC; Yang, WC; Ge, YY; Jiang, KL; Huang, JW Optimized carbonization of coffee shell via response surface methodology: A circular economy approach for environmental remediation(2024) | |
| 13058
|
Carnier, R; Coscione, AR; de Abreu, CA; Melo, LCA; da Silva, AF Cadmium and lead adsorption and desorption by coffee waste-derived biochars(2022) | |
| 3177
|
Ktori, R; Kamaterou, P; Zabaniotou, A Spent coffee grounds valorization through pyrolysis for energy and materials production in the concept of circular economy(2018)Materials Today-Proceedings, 5, 14 | |
| 15004
|
Sousa, S; Duarte, E; Mesquita, M; Saraiva, S Energetic Valorization of Cereal and Exhausted Coffee Wastes Through Anaerobic Co-digestion With Pig Slurry(2021) | |
| 22093
|
Lee, KT; Cheng, CL; Lee, DS; Chen, WH; Vo, DVN; Ding, L; Lam, SS Spent coffee grounds biochar from torrefaction as a potential adsorbent for spilled diesel oil recovery and as an alternative fuel(2022) | |
| 20461
|
Karmee, SK A spent coffee grounds based biorefinery for the production of biofuels, biopolymers, antioxidants and biocomposites(2018) | |
| 28291
|
Fernández-Ferreras, J; Llano, T; Kochaniec, MK; Coz, A Slow Pyrolysis of Specialty Coffee Residues towards the Circular Economy in Rural Areas(2023)Energies, 16.0, 5 |