Increasing of High Heating Value of Organic Waste by Microwave-Assisted Drying Pretreatment
Abstract
Biomass is a promising renewable source for producing various biofuels. This study aimed to improve the high heating value (HHV) of organic waste (vegetable waste) by microwave-assisted drying pretreatment. Organic waste samples, a type of biomass, were obtained from Nonthaburi fresh market: cabbage (Brassica oleracea var. capitata), napa cabbage (Brassica rapa subsp. pekinensis), morning glory (Ipomoea aquatica), kale (Brassica oleracea var. alboglabra) and radish (Raphanus sativus subsp. longipinnatus). The pretreatment was conducted by drying for 1 h, microwave-assisted 450W for 5 min and drying for 1 h, microwave-assisted 800W for 5 min and drying for 1 h and drying for 3 h, all conditions were conducted at 105°C. The results showed that the high initial moisture content of organic waste samples of 90% to 96% after pretreatment shows the high moisture removal content percentages of about 90–96% after microwave-assisted 800W and drying for 1 h and increasing its HHVs were 13.83–15.51 MJ/kg. Moreover the %HHV comparison by microwave-assisted drying pretreatment was higher than conventional drying. In addition, cabbage showed that the highest of its HHV was 16.15 MJ/kg after drying for 3 h. Hence, the results of HHVs of organic waste samples indicated a possible ability to be utilized as biofuel.
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