Abstract
Domestic Wastewater Sludge (DWS) is considered as one of the largest contributor waste in Malaysia. Converting this waste as an alternative fuel can eliminate the disposal problem and reduce the environmental issue that causes by this waste. However, the initial moisture content in DWS is around 90% and in order to convert this waste into useful solid fuel, the moisture content of this waste must be reduced to 20% and below. Thermal dryer is one of the efficient dryer for the DWS that is capable of drying the huge volume of DWS in a short period of time. This study focused on the energy usage by the thermal dryer with several operating condition and the effect to the Higher Heating Value (HHV) of DWS. Based on the study, the higher heating value of DWS obtained from the experimental of thermal dryer found to be comparable with the results obtained from other biomass types which is around 9-15.86 MJ/kg. After analysis and comparison of the energy from the dried DWS and energy consumed by the dryer, the best operating condition of the thermal dryer was at 275 kW of power rating with speed of 30 and 10 rpm (revolution per minute) of the screw conveyor in the feeder and dryer respectively.
Highlights
The demand of energy in Malaysia is rapidly increasing align with the growth of population, industrial and economy
Fossil fuel has become the main source for electricity generation and this fuel has been heavily used for the past few decades in Malaysia and the high dependence on this fossil fuel source creates a huge challenge in the energy and power sector of the country [3]
All the samples obtained from each operating condition will be tested in the bomb calorimeter in order to study the effects of each operating condition to the Higher Heating Value (HHV) of the Domestic Wastewater Sludge (DWS)
Summary
The demand of energy in Malaysia is rapidly increasing align with the growth of population, industrial and economy. Fossil fuel has become the main source for electricity generation and this fuel has been heavily used for the past few decades in Malaysia and the high dependence on this fossil fuel source creates a huge challenge in the energy and power sector of the country [3]. It is well-known that the fossil fuel is a nonrenewable energy which is not sustainable. In any type of biomass, the moisture content in is considered one of the important factors in the combustion process. The effect of operation condition to the energy consumption of thermal dryer and higher heating value of DWS was investigated to determine the optimum operating condition for the thermal dryer
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