- Thesis topic: Study on CO2 and Air Pollutants Emission for Waste Treatment Plant

- Doi: https://doi.org/10.6840/cycu202301461

- Abstract: 

        Waste disposal has always been an issue of concern to the people in Taiwan. High populated and increasing economic developmentmade obviously increasing waste generation. The main waste disposal in Taiwanis incineration, accounting for 93.6%, and sanitary burial is only 6.4%.. Air pollution from incinerators are wildly studied, however, the studies on carbon dioxide emissions from waste incinerators are less. Therefore, this study investigates the air pollutants and carbon dioxide concentrations, emission factors from incinerators at 23 waste treatment plants in the non-hazardous waste treatment industry in Taiwan.The results showed the CO2 emission factors of Fluidized bed incinerator is much lower than that of Fixed-bed Incinerator and Mechanic-Grate Incinerator by about 50%, with CO2 emission factors of 506kg CO2/T, 1058kg CO2/T and 1068kg CO2/T, respectively. This is possibly due to the Fluidized-bed incinerators with low excess air to achieve high combustion efficiency when burning waste, and the total CO2 emissions are lower than those of Fixed-bed Incinerator and Mechanic-Grate Incinerator, and leads to lower emission factors.The air pollution control devices for the 23 incinerators in this study were: bag filter and cyclone dust collector for particulate pollutants; semi-dry scrubber and wet scrubber for SOx and HCl; SNCR technology for NOx, activated carbon with bag filter for heavy metal lead-cadmium and mercury. The concentrations of air pollutants (particulate pollutants, sulfur oxides, nitrogen oxides, hydrogen chloride and heavy metal lead-cadmium-mercury) are far below the Taiwan's emission standardsThe average emission concentration for NOx is 24.3ppm and 25.5ppm for M3 and L2 respectively. The permitted urea dosage is 60-600 L/hr and 300-600 L/hr for M3 and L2 respectively, which is much higher than other plants.
          The emission factors of particulate pollutants, sulfur oxides, nitrogen oxides, hydrogen chloride, heavy metals lead, cadmium, and mercury in the 23 factories in this study were 4.5 - 122.8 g/T, 3.7 -227 g/T, 106.9 - 2530.9 g/T, 4.2 – 187.1 g/T, 0.0014 – 0.21 g/T, 0.00006 – 0.0329 g/T, 0.0043 – 0.074 g/T. The emission factors of various air pollutants varies greatly. Further optimal parameters should be strengthened in the future.

Keywords: Waste Incinerators, Carbon Dioxide, Air Pollutants, Emission Factors