Treatment of metronidazole pharmaceutical wastewater using pulsed switching peroxi-coagulation combined with electro-Fenton process

• DOI: 10.1016/j.watcyc.2024.04.002
• Publication Date: 2024-04-10T16:26:11Z
• Authors: Yongjun Liao; Yongbei Ye; Xindi Chen; Haoran Xin; Shuyue Ma; Songwei Lin; Haiping Luo
• Keywords: Degradation; Oxidation process

The aim of this study was to investigate the metronidazole (MNZ) degradation and real MNZ pharmaceutical wastewater treatment in pulsed switching peroxi-coagulation (PSPC) process. Different frequencies running times H2O2 Fe2+ productions were tested PSPC Results demonstrated that removal 96.9 ± 1.2% realized process with a 200 mg/L 0.1 M Na2SO4 solution within 80 min under frequency 6s: 1s current density 20 mA/cm2 (H2O2) (Fe2+). High could be attributed efficient •OH production highest concentration reached 321 15 mM hydroxyl carboxyl groups sequentially oxidated by mineralized based on seven identified intermediates during degradation. However, only 56.9 6.7% COD removed 90 min. A combined electro-Fenton (EF) developed enhance wastewater. With as electrolytes, 3.3± 0.3 g/L produced conventional EF reactor. final 86 ∼ 90% using mixture effluent from PSPC, anode, cathode chambers reactor, resulting less than effluent. should provide useful way treatment.