《Preferential removal of aromatics-dominated electronic industrial emissions using the integration of spray tower and photocatalysis technologies》

Website：https://www.sciencedirect.com/science/article/abs/pii/S0959652622023046

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ABSTRACT：

Printed circuit board (PCB) manufacturing industrial emission, characterized with low concentration and high gas flow rates, is one of the important sources of toxic and odorous volatile organic compounds (VOCs), which are deleterious to human health and severed as important precursors for ozone formation. Here, we conducted a case study in which an integrated decontamination technique of spray tower (ST) with photocatalysis (PC) was applied to purify the waste gas emitted from a PCB manufacturer. Total 66 VOCs including halogenated hydrocarbons (HHs), aromatic hydrocarbons (AHs), oxygen-containing hydrocarbons (OVOCs), and aliphatic hydrocarbons (AIHs) were quantified using GC-MS during four sampling events. AHs were the largest groups (contributing 88.36 % of the sum of VOCs). The average removal efficiency (RE) of VOCs during the nine months continuous treatment was 73.60%. High RE can be attributed to the following three aspects: the capture efficiency of HHs with slight water solubility (50.16% of RE) and AIHs with low saturated vapor pressure (54.75% of RE) was improved by ST before PC, and AHs was preferentially degraded by PC (61.34% of RE). In addition, ozone formation potentials and health risk (cancer and non-cancer risks) greatly decreased after ST-PC treatment. This study suggests that ST-PC technique is a promising approach for removal of continuous exhausted organic waste gas with low concentration and high gas flow rates, as well asreducingozone formation and health risk.