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| Emission characteristics of PM2.5 and its carbonaceous components emitted from crop straw burning |
| Received:September 19, 2018 |
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| KeyWord:crop straw;fine particulate matter(PM2.5);carbonaceous component;emission factor;indicative component |
| Author Name | Affiliation | E-mail | | YE Xun | Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Jianghan University, Wuhan 430056, China | | | CHENG Jin-jun | Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Jianghan University, Wuhan 430056, China | | | CHEN Sha | Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Jianghan University, Wuhan 430056, China | | | LIANG Zhi-fa | Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Jianghan University, Wuhan 430056, China | | | ZHANG Hui | Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Jianghan University, Wuhan 430056, China | | | LIU Jun-xia | Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Jianghan University, Wuhan 430056, China | | | LIU Qiong-yu | Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Jianghan University, Wuhan 430056, China | qiongyuliu@163.com |
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| Abstract: |
| Five kinds of typical crop straws including wheat, corn, peanut, rice and soybean straws obtained from Huainan, Anhui Province and Wuhan, Hubei Province, were investigated for combustion experiment using self-designed combustion-dilution sampling device. The fine particulate matter (PM2.5) and carbonaceous components emitted from crop straws combustion were collected and the differences in emission factors of PM2.5 and the carbonaceous components in the two regions were analyzed, and the indicative components of carbonaceous components were screened. The result showed that emission factors of PM2.5 from crop straw burning were obviously different for the different crop straw species and regions. The emission factors of PM2.5 from crop straw burning in Huainan were 0.56~7.67 g·kg-1, and that in Wuhan was 3.53~7.91 g·kg-1. Moreover, the emission factor of PM2.5 was also significantly different for the different kinds of crop straws. The emission factor of PM2.5 of peanut straw reached the maximum value with an average value of 5.98 g·kg-1 among the five crop straws, which was 2.93 times of that of soybean straw (the average value was 2.04 g·kg-1). The emission factor of PM2.5 increased with increasing the moisture content in straw. Carbonaceous components were the main component of PM2.5 from crop straw burning, and the percentage of total carbon (TC) in PM2.5 ranged from 36.40% to 65.84%. Among the five crop straws, peanut straw showed the highest emission factor of TC in PM2.5 with an average value of 2.58 g·kg-1, which was 2.41 times of that of wheat straw with the average value of 1.07 g·kg-1. The percentage of organic carbon (OC) was much higher than that of elemental carbon (EC) in PM2.5, and the ratios of OC/EC ranged from 2.36 to 13.73, indicating that crop straw burning had an important effect on the formation of secondary aerosols. The ratios of char-EC/soot-EC in PM2.5 from crop straw in Huainan and Wuhan were between 17.20~64.16, and char-EC was significantly higher than soot-EC. So the ratios of char-EC/soot-EC could be used as an important indicator to judge the source of straw combustion. The result of principal component analysis (PCA) showed that OC1, OC2 and EC1 mainly contributed to the carbonaceous component in PM2.5 in Huainan and Wuhan, and therefore OC1, OC2 and EC1 could be used as indicative components of PM2.5 emitted from crop straw burning. |
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