Effects of Combustion Temperature on the PAHs in Emission from Incineration of Agricultural Wastes
Date Issued
2006
Date
2006
Author(s)
Chang, Shih-Tsung
DOI
zh-TW
Abstract
Agricultural wastes are abundant in Taiwan. They are either recycled as a resource or incinerated in a small portion. Although incineration is not the ideal processing method, yet it is the most rapid way. In the field, we can often observe the incineration of agricultural wastes, dead and sick animal carcasses, agricultural plastics, etc. What impact does the waste gas has on the environment? How to incinerate in order reduce waste gas emission? This is the main discussion topic in this thesis.
This thesis focuses on the incineration of different agricultural wastes and the experimental results. Benzene-related structure in the waste is relatively easy to turn into PAHs after incineration. Long-chain compounds are relatively easier to form PAHs as compared to short chain compounds. The PAHs amount emitted by burning hexadecane is 8 to 9 times of burning hexane. Dead and sick animal carcasses contains large amount of water, thus emit less PAHs after incineration. Burning each gram of rear-leg meat produces 16 kinds of PAHs, in a total amount of 104 μg. It is interesting to note that in our daily life, we can observe in-the-wild incineration process of agricultural wastes where PAHs are emitted in a large amount, which is 10 to 45 times of emission by burning rear-leg meat.
Benzene structure can be opened at 900℃, yet a 900℃ incinerator is expensive and the energy consumption is high. If a low cost incinerator is considered, then incineration at 400-500℃ is more suitable. 700-800℃ incineration, on the other hand, generates more PAHs. Therefore, we recommend the incineration temperature of agricultural wastes to be set at 400-500℃ where the emission of other waste gases are considered as well.
Subjects
多環芳香碳氫化合物
焚化
空氣污染
PAHs
incineration
agricultural waste
air pollution
SDGs
Type
thesis
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