典型PPCPs在活性污泥上的吸附行为研究

batch equilibrium method was used to investigate the adsorption behavior of ciprofloxacin (CIP), tetracycline (TC), chlortetracycline (CTC), sulfamethoxazole (SMX), carbamazepine (CBZ) and triclosan (TCS) onto activated sludge. The results showed that the adsorption process of the six target PPCPs onto activated sludge was fast. The equilibrium time was about 4h. The kinetic results indicated that the adsorption processes followed the pseudo-second-order model, with adsorption rate ranging from 2.18×10-3 to 9.8×10-2 kg/(minomg). The solution pH value had a significant effect on the adsorption of CIP, TC, CTC and TCS, whereas the effect on SMX and CBZ was negligible. Adsorption isotherms of the target PPCPs were well described by the Freundlich equation. As temperature increased, the amount of TC and CTC adsorbed increased, whereas CIP, SMX, CBZ and TCS were decreased. CIP, TC, CTC and TCS had a strong tendency to adsorb onto activated sludge, while the adsorption of SMX and CBZ was unfavorable. As the initial concentrations of PPCPs were 10 mg/L, the equilibrium adsorption capacities of CIP, TC, CTC, SMX, CBZ and TCS were 690.6, 675.2, 701.7, 93.1, 282.9 and 737.5 mg/kg, respectively.