技术问题语段：
While a lot of research is done on the possibilities of the use of spent coffee grounds, currently, limited recycling systems exist for coffee grounds.|The fermentation and deterioration of the coffee grounds during this period results in excessive concentrations of contaminants (e.g. spores of potentially dangerous fungi) in the coffee grounds.|The spent coffee grounds are known to rapidly (within 1 or more days) deteriorate by molding.|This results in large volumes and weights of spent coffee grounds being collected and transported to a processing facility where often one of the process steps process water is removed from the spent coffee grounds.
权利要求：
1. A method for in-situ stabilizing coffee grounds to be repurposed, the method comprising the consecutive steps of: (a) brewing coffee and dispensing coffee grounds; (b) collecting the dispensed coffee grounds; (c) heating the collected coffee grounds; and; (d) dehydrating the coffee grounds, thereby obtaining stabilized coffee grounds to be repurposed; wherein steps (a), (b), (c) and (d) occur in a coffee brewing device.
2. The method according to claim 1, wherein the stabilized coffee grounds to be repurposed have a residual moisture content ranging between 2.50 wt% and 30.0 wt%; preferably 3.0 to 15.0 wt.%, more preferably 4.0 to 7.50 wt.%.
3. The method according to claim 1 or 2, wherein the heating of the coffee grounds occurs through radiation, convection and/or conduction.
4. The method according to any of claims 1 to 3, wherein excess heat derived from the heating step is transferred to and recycled in a coffee brewing device.
5. The method according to any of claims 1 to 4, wherein during step (c) and (d) a negative pressure is applied.
6. The method according to any of claims 1 to 5, wherein the dehydrating step (d) moisture is extracted from the heated coffee grounds through a membrane vacuum pump configured to purge moist air.
7. The method according to any of claims 1 to 6, additionally comprising the step of mixing the coffee grounds during step (c) and/or (d), preferably using vibration, rotation and/or ultrasound mixing.
8. The method according to any of claims 1 to 7, further comprising the step of collecting and repurposing the stabilized coffee grounds.
9. A device for stabilizing and storing the stabilized coffee grounds to be repurposed, the device comprising: • a collector configured to collect and process coffee grounds; • a heater configured for heating the collected coffee grounds; • a membrane vacuum pump for removing water from the heated coffee grounds; and; • a storing unit for collecting and storing stabilized coffee grounds.
10. The device according to claim 9, wherein said device is integrated within a coffee brewing device.
11. The device according to claim 9, wherein the device is a stand-alone unit configured to be operated with a separate coffee brewing device.
12. The device according to any of claims 9 to 11, wherein excess heat generated by the heater is transferred to a coffee brewing device.
13. The device according to any of claims 9 to 12, wherein the moisture purged through the water pump is recycled for reuse.
14. The use of stabilized coffee grounds obtained from the method according to any of claims 1 to 7, as a solid burnable fuel composition.