A Mass Balance-based Emission Inventory Of Volatile Organic Compounds For Solvent Use In China

Volatile organic compounds(VOCs)are important precursors of ozone(O3)and secondary organic aerosol(SOA),which play key roles in tropospheric chemistry.Solvent use is one of the main sources of VOCs emissions.This work presents a longterm VOCs emission inventory of solvent use during 2000-2017 in China.Based on a mass(material)balance method,VOCs emissions were estimated for six categories,including coatings,adhesives,inks,pesticides,cleaners and personal care products.The results show that VOC emissions from solvent use in China increased rapidly from2000 to 2014 then kept stable after 2014.The total emission increased from 1.6 Tg in2000 to 10.6 Tg in 2017.The substantial growth is driven by the large demand of solvent products in both industrial and residential activities.However,increasing treatment facilities on the solvent-related factories in China restrained the continued growth of solvent VOCs emissions in recent years.Rapidly developing and heavily industrialized provinces such as Jiangsu,Shandong and Guangdong contributed significantly to the solvent use emissions.Oxygenated VOCs,alkanes and aromatics were main components,accounting for 42%,28% and 21% of total VOCs emissions in2017,respectively.Our results and previous inventories are generally comparable within the estimation uncertainties [-27%,52%].However,there exist significant differences in the estimates of sub-categories.Personal care products were a significant and quickly rising source of NMVOCs,which were probably underestimated in previous inventories.Emissions from solvent use were growing faster compared with transportation and combustion emissions which were relatively better controlled in China.For environmental reasons,environmentally friendly products are advocated to reduce the VOCs emissions from solvent use.Supposing all solvent-based products were substituted by water-based products,it would result in 37%,41% and 38%reduction of emissions,OFP and SOAP,respectively in 2017.At present,the installation of VOCs processing device in factories and enterprises has not been fully popularized and most of them are using low efficiency processing technology.Assuming the popularity of high efficiency VOCs end processing device,it would result in 32%,35% and 33% reduction of emissions,OFP and SOAP,respectively in 2017.These results indicate there is still large room for NMVOCs reduction by reducing the utilization of solvent product and end-of-pipe control across industrial sectors.