Fate of phthalates in a river receiving wastewater treatment plant effluent based on a multimedia model

Abstract

Phthalic acid esters (PAEs) can enter environment media by secondary effluent discharge from wastewater treatment plants (WWTP) into receiving rivers, thus posing a threat to ecosystem health. A level III fugacity model was established to simulate the fate and transfer of four PAEs in a study area in Tianjin, China, and to evaluate the influence of WWTP discharge on PAEs levels in the receiving river. The results show that the logarithmic residuals of most simulated and measured values of PAEs are within one order of magnitude with a good agreement. PAEs in the study area were mainly distributed in soil and sediment phases, which accounted for 84.66%, 50.26%, 71.96% and 99.09% for dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP) and di-(2-ethylhexyl) phthalate (DEHP), respectively. The upstream advection accounted for 77.90%, 93.20%, 90.21% and 90.93% of the total source of DMP, DEP, DBP and DEHP in the river water, respectively, while the contribution of secondary effluent discharge was much lower. Sensitivity analysis shows that emission and inflow parameters have greater influences on the multimedia distributions of PAEs than physicochemical and environmental parameters. Monte Carlo analysis quantifies the uncertainties and verifies the reliability of the simulation results. HIGHLIGHTS The fate of PAEs in a river receiving WWTP effluent was simulated by fugacity model.; DEHP had the highest total amount and residence time in the system.; Air–soil/water and water–sediment were the main ways of PAEs cross-interface transfer.; River advection played a principal role in the spatial distribution of PAEs.;

Keywords

• fate and transfer
• level iii fugacity model
• phthalic acid esters
• receiving river
• secondary effluent
• sensitivity analysis