TY - JOUR

T1 - 过流式UV/H2O2反应器中阿特拉津降解动力学的测定及模拟评估

AU - Zhan, Lumeng

AU - Li, Wentao

AU - Li, Mengkai

AU - Jensen, Marina Bergen

AU - Zhang, Miao

AU - Qiang, Zhimin

N1 - Publisher Copyright: © 2021, Science Press. All right reserved.

PY - 2021

Y1 - 2021

N2 - UV-based advanced oxidation processes are promising in micropollutant removal from water with abundant relative researches accomplished in batch reactors, while the different flow pattern in practical flow-through UV reactors may lead to a varied reaction kinetic and process efficiency. In this study, the kinetics of atrazine (ATZ) degradation in flow-through UV/H2O2 reactors were investigated, and the impacts of H2O2 concentration and internal reactor diameter on ATZ removal efficiency and the process energy efficiency were evaluated. The steady-state assumption (SSA) model was developed to predict the degradation kinetics of atrazine under various experimental conditions, and its accuracy was tested by comparing with experimental data. The results showed that the efficient degradation of ATZ occurred in flow-through UV/H2O2 reactors and it followed the pseudo first-order kinetics (R2>0.95). Despite the fact that the flow was not fully mixed, SSA model exhibited good accuracy in predicting the degradation of target pollutant in flow-through reactors with deviations generally less than 20%. Within the investigated concentration range, ATZ degradation rate in different reactors increased with the rising of H2O2 concentration, and reached 5.8×10−2 s−1 in the reactor with an internal diameter of 35 mm when H2O2 concentration was 0.2 mmol·L−1, which was 4 times as much as that in UV radiation alone. The increasing reactor diameter resulted in a low time-based ATZ degradation rate constant on account of the changes in average fluence rate, while had slight effect on the fluence-based ATZ degradation rate constant. Finally, based on the electrical energy per order (EEO) calculation, the energy efficiency in removing ATZ can be reduced by increasing H2O2 concentration and reactor diameter.

AB - UV-based advanced oxidation processes are promising in micropollutant removal from water with abundant relative researches accomplished in batch reactors, while the different flow pattern in practical flow-through UV reactors may lead to a varied reaction kinetic and process efficiency. In this study, the kinetics of atrazine (ATZ) degradation in flow-through UV/H2O2 reactors were investigated, and the impacts of H2O2 concentration and internal reactor diameter on ATZ removal efficiency and the process energy efficiency were evaluated. The steady-state assumption (SSA) model was developed to predict the degradation kinetics of atrazine under various experimental conditions, and its accuracy was tested by comparing with experimental data. The results showed that the efficient degradation of ATZ occurred in flow-through UV/H2O2 reactors and it followed the pseudo first-order kinetics (R2>0.95). Despite the fact that the flow was not fully mixed, SSA model exhibited good accuracy in predicting the degradation of target pollutant in flow-through reactors with deviations generally less than 20%. Within the investigated concentration range, ATZ degradation rate in different reactors increased with the rising of H2O2 concentration, and reached 5.8×10−2 s−1 in the reactor with an internal diameter of 35 mm when H2O2 concentration was 0.2 mmol·L−1, which was 4 times as much as that in UV radiation alone. The increasing reactor diameter resulted in a low time-based ATZ degradation rate constant on account of the changes in average fluence rate, while had slight effect on the fluence-based ATZ degradation rate constant. Finally, based on the electrical energy per order (EEO) calculation, the energy efficiency in removing ATZ can be reduced by increasing H2O2 concentration and reactor diameter.

KW - Degradation rate

KW - Electrical energy per order

KW - Flow-through reactor

KW - Steady-state assumption model

KW - UV/HO

U2 - 10.12030/j.cjee.202008067

DO - 10.12030/j.cjee.202008067

M3 - Tidsskriftartikel

AN - SCOPUS:85103333039

VL - 15

SP - 982

EP - 991

JO - Chinese Journal of Environmental Engineering

JF - Chinese Journal of Environmental Engineering

SN - 1673-9108

IS - 3

ER -