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| Determination and formation mechanism of precedence-controlled VOCs pollutants in chemical plant |
| ZHANG Gui-qin1, LI Si-yuan1, PAN Guang2, ZHU Li1, SUN You-min1 |
1. School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China;
2. Shandong Environmental Monitoring Center Station, Jinan 250101, China |
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Abstract A chemical enterprise in Shandong province was chosen as a research object to quantitatively analyze the emission characteristics of VOCs. To carry out the study, samples from both organized and unorganized emissions were collected under normal operating conditions using the bags method. The mass concentration of VOCs was obtained using GC-TOF-MS technology. The results showed that the mass concentration of VOCs in the organized samples and unorganized samples was 0.562~9.629mg/m3 and 0.789~1.212mg/m3, respectively. The 10 pollutants with high mass concentrations of VOCs were different between the organized and unorganized samples. Interestingly, the top 10 pollutants in unorganized samples were also determined in the organized samples from the total exhaust emissions outlet. In addition, three methods were used to evaluate the Ozone Formation Potential (OFP) of VOCs to determine the top 10 precedence-controlled VOC pollutants. According to the evaluation results, the major VOC pollutants were aromatic hydrocarbons and sulfur/oxygen compounds. Chemical theoretical analysis and quantum chemistry method were used to calculate the energy difference between the lowest unoccupied orbital of the molecule and the highest occupied orbital of the free radical. It was found that VOCs preferred to react with methyl radicals to form long-chain alkanes and aromatic hydrocarbons. The theoretical analysis results were agreement with the experimental phenomenon that the precedence-controlled VOCs pollutants were detected in the organized emissions.
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Received: 28 September 2018
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