Research on Phthalic Acid Esters Removal and Its Health Risk Evaluation by Combined Process for Secondary Effluent of Wastewater Treatment Plant

Figure 1

Process flow chart: (1) raw water tank; (2) submersible sewage pump; (3) grit chamber; (4) mixing tank; (5) peristaltic pump; (6) coagulative precipitation tank; (7) ozonation contact column; (8) ozone release tank; (9) sand filter column; (10) active carbon; (11) solution tank; (12) air compressor; (13) ozone generator; (14) backwash return pump; (15) sand filter column water outlet; (16) active carbon column water outlet; (17) magnetic valve; (18) sample tap; (19) back wash water inlet; (20) back wash water inlet; (21) back wash air inlet; (22) stirrer.