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The objective of this study was to develop methodology for production of briquette fuel using wastewater sludge and banana peel waste. In this research, briquette fuel was produced from wastewater sludge mixed with banana peel waste in various weight ratios. Analyses of the briquette fuel properties were conducted including moisture content, ash content, volatile matter, fixed carbon, total sulfur and heating value. The assessment also determined the most appropriate wastewater sludge to banana peel waste ratio for briquette fuel and its economic value.
Selected ratios of wastewater sludge to banana peel for the test were 90:10, 80:20 and 70:30. The physical and fuel properties of the briquettes were tested. Briquette fuel at all tested raw material ratios significantly differed in terms of compressive strength, ash content and volatile matter (p<0.05). The briquette density at ratio of 70:30 was significantly higher than those at 90:10 and 80:20 (p<0.05). The fixed carbon at ratio of 90:10 was significantly lower than those at 80:20 and 70:30 (p<0.05). The heating value at ratio of 70:30 was significantly higher than that at 90:10 (p<0.05). No significant differences were observed in the moisture and total sulfur contents in the briquette fuels (p>0.05). Moreover, the briquette fuels at various tested ratios had a suitable moisture content with reference to the Standard of Community Products of the Thai Industrial Standard Institute. However, the heating values of the briquette fuels were still lower than the standard value. At a price of 1 baht/briquette (29 baht/kg) the breakeven point was 223,024 briquettes and the payback period was 4.58 years. From this finding, it was suggested that the appropriate ratio of wastewater sludge to banana peel waste for briquette fuel production should be 70:30 based on their optimal heating value, fixed carbon and volatile matter and lowest moisture content.
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