The VOCs emission characteristics ofmetal surface coating industryand its emission factors
WANG Jia-de1, JIN Dan-jun1, Gu zhen-yu2, LU Jian-hai2, YE Zhi-ping1, DONG Shi-bi2
1. College of Environment, Zhejiang University of Technology, Hangzhou 310014, China;
2. Zhejiang Institute of Environmental Protection Science, Hangzhou 310007, China
This paper focused on the variation ofthe organic waste gasemissions and the circumstance of pollution control from metal surface coating industry in Zhejiang Province in the year of 2014 and 2018. The kind of coating and thinners,and criteria pollutants used in the industrialwereanalyzed. The coefficient of generating and emission of volatile organic compounds (VOCs) from solvent-based coatings and water-based coatingswerecalculated. The results showed that the control of VOCs in 2018 was significantly more effective than that in 2014, the proportion of companyusing water-based coatings increased from 18% to 36%, and then the proportion of company using solvent-based coatings decreased from 82% to 64%. The pollutants of metal surface coating industry wererevealed to be xylene, butanol, ethyl acetate, butyl acetate, toluene, propylene glycol, ethylbenzene and styrene. At last, the VOCs generating coefficients of solvent-based coatings and water-based coatings were 0.72 and 0.31kg/kg, respectively. The VOCs emission coefficients of solvent-based coatings and water-based coatings in 2014 were 0.64 and 0.29kg/kg, respectively, and the values of which in 2018 were 0.48 and 0.21kg/kg, respectively.
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