Remediation of textile wastewater by hybrid technique using ZIF-67 catalyzed ozonation coupled with electrocoagulation

Large-scale industrial wet processing generates high volumes of wastewater, causing a continuous disruption of the clean environment. Textile wastewater contains high mass loadings of contaminants, which poses a challenge to the environment and requires adequate treatment. This study aims to investigate the treatment of textile wastewater by catalytic ozonation coupled with electrocoagulation using ZIF 67 as a catalyst in a hybrid reactor. This research explores the first application of ZIF-67 in a hybrid system with catalytic ozonation and electrocoagulation processes to treat real textile effluent. The initial characterization of wastewater indicated high pollutant loads such as 480 mg/L chemical oxygen demand (COD) and 210 mg/L biological oxygen demand (COD). The influence of operational parameters like current density, ozone dose, pH, and catalyst dose were studied. The heterogeneous catalytic ozonation-electrocoagulation (HCOP-EC) process achieved 79.6 % decolorization, 73.3 % COD removal, and 69.04 % BOD after 30 min of treatment at optimal conditions of pH 9, ozone dose 0.3 mg/min, current density 15.2 mA/cm², and catalyst dose 50 mg/L. The catalyst reusability study showed an efficient performance of up to 3 cycles. Due to the complex matrix nature of the real effluents, the HCOP-EC combined process may be effectively applied to remediate pollutant loads in real textile wastewater.