Thanyaluk Titawiriya. Methods for determining calorifig values of municipal solid waste in Salaya subdistrict municipality. Master's Degree(Technology of Environmental Management). Mahidol University. Mahidol University Library and Knowledge Center. : Mahidol University, 2013.
Methods for determining calorifig values of municipal solid waste in Salaya subdistrict municipality
Abstract:
This research studied methods of determining the calorific values of municipal solid waste (MSW) from the Salaya Subdistrict Municipality, Nakorn Pathom Province. This research aimed to compare calorific values analyzed by using a bomb calorimeter with those predicted based on physical composition, proximate analysis and ultimate analysis based models including the Hesss law based model. Seven samples of solid waste were collected on 1 August 2011, 8, 11, 17, 23, 26 and 28 February 2012 in order to analyze physical composition, proximate analysis, ultimate analysis and calorific values. The results showed that higher heating values (HHV) of combustible MSW ranged from 5,792 to 7,660 cal/g (dry basis) and an average value was 6,694 cal/g (dry basis). Compared to HHV predicted by the model based on physical composition: HHV (cal/g) = 5,383.541 + 0.457 plastic2 , which was Teerawattana et al s equation, it was found that the HHV of combustible MSW was the most accurate with an average absolute error (AAE) of 3.33 %. Compared to HHV predicted by the model based on proximate analysis: HHVdb (MJ/kg) = 19.914 - (0.2324ashdb), which was Sheng and Azevedos equation, it was found that HHV of wood was the most accurate with AAE of 2.02 %. Compared to HHV predicted by the model based on ultimate analysis: HHVad (cal/g) = 135.505C ad, which was Teerawattana et al s equation, it was found that the HHV of plastic was the most accurate with AAE of 4.37 %. Compared to HHV predicted by the another model based on ultimate analysis: HHVdb (MJ/kg) = -1.3675 + 0.3137Cdb + 0.7009Hdb + 0.0318Odb * , which was Sheng and Azevedos equation, it was found that the HHV of food waste, paper, wood and textile were accurate with AAE of 3.19, 1.48, 5.78 and 5.13 %, respectively. Compared to HHV predicted by the constructed model based on Hesss law, it was found that the HHV of plastic, wood, textile, and combustible MSW were rather accurate with AAE of 8.90, 7.22, 6.07 and 5.60 %, respectively. But the coefficient of determination (R2 ) of the constructed equation was low, therefore further development should be conducted.