Removal of organic micropollutants from water by sonophotolytic-activated persulfate process

摘要

The present study focuses on the improvement of the efficiency of water treatment by coupling irradiation with ultraviolet(UV)light-emitting diodes and high-frequency ultrasound(US)for activation of persulfate(PS).Organic micropollutants(atrazine,bisphenol A and carbamazepine)were sequentially treated in aqueous solution at non-adjusted pH and initial concentration of 20 uM in a batch sonophotoreactor.The hybrid oxidation system(UV/US/PS)showed the highest efficiency(≥90%)for removing bisphenol A and carbamazepine within 40 min of treatment,whereas atrazine was degraded with comparable rates under UV/PS and UV/US/PS processes.In terms of removal efficiency,the applied systems for bisphenol A and carbamazepine can be arranged as follows: UV/US/PS>UV/PS>US/PS>UV/US ≈ UV ≈ US.Overall,the hybrid sonophotolytic method using high-frequency US appears to be a promising technique to activate PS for eliminating organic micropollutants from aqueous media.