Abstract
The solvent-used industry plays an important role in volatile organic compounds (VOCs) emission, which has caused an increasing concern. Herein, VOCs samples collected before and after treatments from the painting industry, printing industry and printing & dyeing industry in Hangzhou were measured. Then, the VOCs removal efficiencies of different treatments were detailedly investigated. Among them, high-temperature incineration technology achieved the highest VOCs removal efficiency, averaging 93.0%. Process-based source profiles suggested that aromatics and alkanes accounted for more than 76.5% of VOCs, mainly including toluene, styrene, n-decane, n-undecane and n-dodecane. Furthermore, the ozone formation potentials (OFPs) based on processes suggested that toluene, meta-xylene, n-butene, styrene and ortho-xylene should be preferentially controlled to reduce the OFPs in painting industry and printing & dyeing industry. For printing industry, the contributions of top five species to the OFPs were relatively balanced, which indicated these species should all be given more attention. Finally, the low-temperature plasma technology and the combined technology of activated carbon adsorption with condensation were found to reduce the OFPs for their ability to preferably removing aromatics or olefins. The results were beneficial to develop effective VOCs abatement strategies and complemented the VOCs source profiles in solvent-used industries.
Highlights
Publisher: Taiwan Association for Aerosol Research ISSN: 1680-8584 print ISSN: 2071-1409 onlineCopyright: The Author(s)
Process-based source profiles suggested that aromatics and alkanes accounted for more than 76.5% of volatile organic compounds (VOCs), mainly including toluene, styrene, n-decane, n-undecane and n-dodecane
In order to study the efficiencies of VOCs treatment technologies and their influence on source profiles and ozone formation potentials (OFPs), the VOCs samples before and after treatment facilities were collected in different processes strictly following the specification HJ/T 397-2007 (Technical specifications for emission monitoring of stationary source) and the standard HJ 7322014 (Emission from stationary sources-sampling of volatile organic compounds-bags methods)
Summary
Publisher: Taiwan Association for Aerosol Research ISSN: 1680-8584 print ISSN: 2071-1409 online. Studying the emission characteristics and atmospheric chemical activity of anthropogenic VOCs emission source is an important basis for understanding the formation mechanism of air pollution and devising effective control policies (Li et al, 2020). Some researchers found emission profiles of some industries were process-oriented and established the process-based VOCs source profiles (Mo et al, 2015; Cheng et al, 2021) They pointed out the refined VOCs source profiles were more conducive to identifying emission characteristics and developing effective control strategies. Studying the emission characteristics and the VOCs removal efficiency of mainstream technologies of typical processes in solvent-used industries in Hangzhou would contribute to the air quality assurance of the Asian Games. This study mainly concentrated on process-based VOCs characteristics in typical solvent-used industries, which helped to precisely identify the emission characterization and effectively control the VOCs emission to relieve secondary pollution
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