VOC emission characteristics of petrochemical wastewater treatment facilities in southern Taiwan.
The wastewater treatment plants (WWTPs) of three representative petrochemical plants in southern Taiwan were sampled to investigate their VOC emission characteristics. Generally, emissions decline along the process flow, while the VOC concentration accumulates to as much as around 2400mg/m3 (as total hydrocarbons) at several closed vessel vents during the primary treatment. VOC emission rates (g/s) and fluxes (g/m2 hr) exhibit a similar trend of reducing concentrations in the WWTPs. From the field analysis data. VOC emission potential is best indicated by the concept of emission flux rather than concentration or emission rate. The Water 8 emission model version 4, developed by the U.S. EPA in 1995, was used to simulate the emission rate. The output results were compared to the calculated VOC liquid-gas mass equilibrium based essentially on the saturated gas concentration (Cg*) of the individual VOC components in wastewater. The comparisons clearly identified the proposed mass transfer approach using (Cg* as a reliable timesaving alternative to Water 8, which requires numerous input parameters and water analysis data.
Cheng
Wen-Hsi
WH
Department of Industrial Safety and Hygiene, Fooyin University, Kaohsiung Hsien, Taiwan, ROC. PL031@mail.fy.edu.tw
Chou
Ming-Shean
MS
D000393:Air Pollutants / Q000032:analysis*; D002617:Chemical Industry; D006838:Hydrocarbons / Q000032:analysis*; D007220:Industrial Waste; D008962:Models, Theoretical; D010578:Petroleum; D013624:Taiwan; D014835:Volatilization; D014865:Waste Disposal, Fluid / Q000379:methods*
D000393:Air Pollutants; D006838:Hydrocarbons; D007220:Industrial Waste; D010578:Petroleum