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Modeling the Fate of Benzo[a]pyrene in the Wastewater-Irrigated Areas of Tianjin with a Fugacity Model

X. L. Wang, S. Tao*, F. L. Xu, R. W. Dawson, J. Cao, B. G. Li and J. Y. Fang

Department of Urban and Environmental Sciences, Lab. for Earth Surface Processes, Peking Univ., Beijing 100871, China



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  		Fig. 1. The study area.

 


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  		Fig. 2. The main compartments and the transfer processes between compartments. The terms DAW1, DAS1, and DSW1 represent diffusion rate coefficients across air–water, air–soil, and water–sediment interfaces respectively; DAW2, DAW3 and DAS2, DAS3 refer to dry and wet deposition rate coefficients from air to water and soil respectively; DSW2 is the deposition rate coefficient from water to sediment; DWR and DSR represent transfer rate coefficients from soil to water via runoff of either water or solids; I1 and I2 are inflow fluxes via air and water; D1a and D2w refer to output rate coefficients via air and water; D2f and D3c are output rate coefficients with consumption of fish, crops, and vegetables; and D3d and D4d are biodegradation rate coefficients in soil and sediment, respectively.

 


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  		Fig. 3. Benzo[a]pyrene fluxes in and out of the four bulk compartments.

 




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