2:45 PM - 3:00 PM
[3Mp-02] Composting of Fruit Harvest Residues and Utilizing Composting Heat
Keywords:Harvest residue, Compost, Composting heat
[Purpose] This study aims to reduce the disposal cost, the fuel used for incineration, and the CO2 emitted by combustion by composting the fruit harvest residues that are not shipped. Furthermore, the composting heat and CO2 generated during the composting process can be used for greenhouse cultivation, thereby reducing fuel consumption for heating and CO2 replenishment.
[Methods] Harvest residue of mandarin oranges were cut, crushed, and uniformly mixed with composting secondary materials to prepare a model composting sample. The experiment was conducted over a period of six days. The samples were placed in a 10 L adiabatic fermentation tank, which was sealed and supplied with air from its bottom. The temperature and weight changes of the composted samples and the amount of emissions (water, CO2, and ammonia) from the tanks were determined. The amount of heat discharged was calculated from the temperature of the exhaust gas at the tank outlet, and the amount of decomposed organic matter was determined from the concentration of CO2 contained in the exhaust gas.
[Results] The maximum temperature of the composting sample was about 58°C, which was significantly lower than that of the livestock manure, and the maximum temperature of the composting exhaust gas at the outlet of the fermenter was about 55°C. The quantity of heat from the composting exhaust gas was 0.34 MJ per kg of fruit weight. This corresponds to 8.4 mL of fuel oil. The CO2 production from the fermenter tank was 0.12 kg per kg of fruit weight. Although the amount of energy recovered was not significant, the fact that ammonia was not detected in the exhaust gas suggests that the composting exhaust gas could be used for heating and CO2 replenishment by feeding it directly to the greenhouse.
[Methods] Harvest residue of mandarin oranges were cut, crushed, and uniformly mixed with composting secondary materials to prepare a model composting sample. The experiment was conducted over a period of six days. The samples were placed in a 10 L adiabatic fermentation tank, which was sealed and supplied with air from its bottom. The temperature and weight changes of the composted samples and the amount of emissions (water, CO2, and ammonia) from the tanks were determined. The amount of heat discharged was calculated from the temperature of the exhaust gas at the tank outlet, and the amount of decomposed organic matter was determined from the concentration of CO2 contained in the exhaust gas.
[Results] The maximum temperature of the composting sample was about 58°C, which was significantly lower than that of the livestock manure, and the maximum temperature of the composting exhaust gas at the outlet of the fermenter was about 55°C. The quantity of heat from the composting exhaust gas was 0.34 MJ per kg of fruit weight. This corresponds to 8.4 mL of fuel oil. The CO2 production from the fermenter tank was 0.12 kg per kg of fruit weight. Although the amount of energy recovered was not significant, the fact that ammonia was not detected in the exhaust gas suggests that the composting exhaust gas could be used for heating and CO2 replenishment by feeding it directly to the greenhouse.