Combination of membrane contact ozone and ultraviolet processes for enhanced degradation of ozone-resistant micro organic pollutants [膜接触臭氧-紫外联用强化降解耐臭氧微量有机污染物]

作者：Wang Y.; Li M.; Sun Z.; Zhang H.; Hans C.B.H.; Qiang Z.^*

来源：Chinese Journal of Environmental Engineering, 2022, 16(6): 1807-1815.

DOI：10.12030/j.cjee.202203191

• advanced oxidation
• membrane contact O3
• O3resistant micro organic pollutants
• ozonation
• UV

Ozone (O3) has been widely used in advanced water treatment but can hardly degrade O3resistant micro organic pollutants (OR-MOPs). For enhanced degradation of OR-MOPs, a membrane contact O3-UV experimental system was developed by combining an O3membrane contactor (OMC) and a mini-fluidic photoreaction system (MFPS). The performance of OMC was evaluated, showing that the dissolved O3increases with the rise of gaseous O3mass concentration, or decreases with the solution flow rate and pH; phosphate has no effect on the O3dissolution; photon fluence rate of MFPS was determined as 4.56×10?4 Einstein·m?2·s?1. By using the combination of membrane contact O3and UV processes, the removal efficiencies of ibuprofen, a representative OR-MOP, were 63.2% and 82.9% at aqueous O3mass concentrations of 1.0 and 2.0 mg·L?1, which were 38.1% and 44.5% higher than those by sole ozonation, respectively, with O3fully utilized. The degradation of ibuprofen was enhanced as the pH increased, and the highest removal efficiency (77.2%) of ibuprofen was achieved at aqueous O3mass concentration of 1.0 mg·L?1 and pH = 9.0. Hydroxyl radical (HO?) oxidation contributed more than 90% of the main degradation pathways of ibuprofen. This study demonstrated that the combination of membrane contact O3and UV processes could enhance the degradation of OR-MOPs and improve the O3utilization efficiency, which provided a new method for application of O3in water advanced treatment.

• 单位
  中国科学院大学