Assessment of greenhouse gas emissions from food waste management in Bang Khun Thian and Lat Phrao district, Bangkok.
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Abstract
This study aimed to estimate the net GHG emission from waste recycle and reuse at the districts to final disposal in Bang Khun Thian (BKT) district and Lat Phrao (LP) district. The data input obtained from the five annual reports of solid waste disposal (2015-2019). The composition was analyzed by a quartering method for three consecutive seasons. The coefficients also input to the equations were adopted from literatures. Based on the model developed by Thailand Greenhouse Gas Management Organization, USEPA and the 2006-IPCC Guidelines, the annual emissions of CO2, CH4 and N2O were calculated. Assumingly, these three essential gases were mainly emitted during the anaerobic decomposition of compostable organics and fuel and electricity usage. As a result, BKT and LP districts generated food wastes about 53,214.76 (SD 4,233.21) tonnes/year and 38,639.09 (SD 2,811.31) tonnes/year, respectively. The landfill management emitted the highest GHGs with the rate of 15,916,889.94 (SD 959,364.36) kgCO2e/yr for BKT and for LP with 9,456,521.28 (SD 788,409.40) kgCO2e/yr. The process of food waste disposal of BKT emitted GHGs about 15,916,889.94 (SD 959,364.36) kgCO2e/yr or 341.48 (SD 5.41) kgCO2e/ton-food waste. Likewise, management of LP emitted about 9,456,521.28 (SD 788,409.40) kgCO2e/yr or 276.33 (SD 33.04) kgCO2e/ton. This difference between the two districts is statistically significant (p-value 0.012). Therefore, to reduce amount of food waste going to landfill, food loss and waste reduction or waste utilization at the districts is likely to be the key mitigation, resulting in the reduction of GHGs emission.
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