[Emission Characteristics and Environmental Impact of VOCs from Chemically Synthesized Pharmaceuticals in Shandong Province]

Three typical chemical synthesis pharmaceutical enterprises in Shandong Province were selected as the research object, 61 volatile organic compounds （VOCs） in different emission processes were monitored, the VOCs source profile of each enterprise was established, the impact of VOCs on ozone formation potential was evaluated, and the VOCs emission factor of localized synthetic pharmaceutical enterprises was constructed. The results showed that： The average ρ（TVOCs） of the organized emissions of the three pharmaceutical enterprises varied from 6 055.46 to 10 700.10 μg·m^-3 and the average ρ （TVOCs） of the unorganized emissions varied from 3 665.65 to 6 616.03 μg·m^-3. Halogenated hydrocarbons were the major component of the organized emissions, with mass fractions as high as 45.23% to 56.12% and OVOCs were the primary components of the unorganized emissions, with mass fractions as high as 61.06%-83.52%. The major VOCs emission species were methanol, ethanol, 2-propanol, acetone, ethyl acetate, butyl acetate, chloromethane, carbon tetrachloride, etc. Significant differences were observed in the removal efficiency of different VOCs species by removal facilities and the treatment efficiency of halogenated hydrocarbons in RTO was the lowest. The treatment efficiency of halogenated hydrocarbon species in enterprise 2 was only 15%. According to the results of the secondary formation potential of species, OVOCs and aromatic hydrocarbons should be the key species of ozone generation, among which ethanol, propanal, 2-propanol, acetone, n-butanol, toluene, and ethyl acetate had significant effects. The annual emission of enterprises was 1.16-3.66 t·a^-1 and the emission factor was 1 450-2 830 g·t^-1. Enterprise 1 had the highest OVOCs emission factor, with a total of 1 132.3 g·t^-1.