Spectral characteristics of VOCs emission sources from typical industries in Guangxi
Volatile organic compounds(VOCs)are important precursors for ozone generation,and characterising the compositional profile of their emission sources is the key to solving the problem of ozone pollution prevention.Currently,ozone pollution in Guangxi is becoming more and more prominent,but the emission of VOCs is still ambiguous.In order to address this problem,this study sampled VOCs emissions from five typical industries in Guangxi,namely packaging and printing,furniture manufacturing,automobile maintenance,granite manufacturing,and man-made board manufacturing,and analysed 115 VOCs components to investigate their VOCs emission concentration levels,source spectral characteristics,and Ozone Formation Potential(OFP).The results showed that the packaging and printing industry had the relatively highest concentration of VOCs(12.98 mg·m3),which was 2-86 times higher than that of the remaining four industries,followed by furniture manufacturing(5.72 mg·m-3),automotive servicing(1.34 mg·m-3),granite manufacturing(0.84 mg·m-3),and wood-based panel manufacturing(0.15 mg·m-3)industries,respectively.Among them,emissions from the packaging and printing industry were dominated by alkanes(55.37％),followed by oxygenated OVOCs(27.51％);emissions from the furniture manufacturing industry were dominated by OVOCs(50.98％),followed by aromatic hydrocarbons(31.05％);the automotive repair industry was dominated by aromatic hydrocarbons(32.25％),followed by OVOCs(23.76％);the composition of the granite manufacturing sector is dominated by alkanes(42.43％),followed by aromatic hydrocarbons(23.76％);and the wood-based panel manufacturing sector is dominated by OVOCs(52.05％),followed by aromatic hydrocarbons(14.32％).The results of OFP calculations show that the size of the OFP is in the order of furniture manufacturing(22.62 mg·m-3)＞packaging and printing(17.24 mg·m-3)＞automotive servicing(4.29 mg·m-3)＞granite manufacturing(1.44 mg·m-3)＞wood-based panel manufacturing(0.50 mg·m-3)industries,and the key species that make the largest contribution to the OFP in the five industries are,in order of magnitude,hexanal(44.0％),and aromatic hydrocarbons(23.76％).The key species contributing most to the ozone generation potential in the five sectors were hexanal(44.21％),2-methylhexane(9.76％),m/p-xylene(24.61％),styrene(29.27％),and acetaldehyde(23.86％),in that order,respectively.VOCs management for furniture manufacturing,automotive repair,granite manufacturing,and artificial board manufacturing industries and the prevention and control of ozone pollution caused by them should focus on high contribution rate key VOCs species.
NETL
NSTL
万方数据
