Uptake of Humic Substance and COD From Aqueous Solutions Using Synergic Processes Such as O-3/pH, O-3/HCO3- and O-3/PAC and Multiple Regression Analysis

Efficiencies of humic substance (HS) and chemical oxygen demand (COD) uptake from aqueous solutions were investigated using O-3/HS (100, 200, and 300 mg/L), O-3/pH (4, 10, and 12), O-3/F. Rate (5, 10, and 15 L/min), O-3/Voltage (96, 135, and 170 V), O-3/Tem. (14, 40, and 60 degrees C), O-3/HCO3- (0, 1000, and 2000 mg/L) and O-3/PAC (0, 0.5, and 1 g/250 mL) processes. In this study, as distinct from the previous study, the main objective is the augmentation of efficiencies of HS and COD, and determination of the effective process using above stated processes. As a consequence of ozonation of 18 min, the efficiencies of HS and COD were determined as [(91, 85.7, and 79.3) and (76.6, 79.3, and 80), (76.3, 81.2, and 82.6) and (56.6, 72.6, and 79.3), (79.3, 81, and 82.3) and (79.3, 76.6, and 74.7), (79.3, 90.3, and 94) and (25.4, 24.2, and 23.2), (21.2, 23.2, and 24.5) and (23.2, 24.6, and 25.7), (19.3, 21.5, and 23.2) and (23.2, 24.8, and 26.3), (23.2, 20.8, and 19.3) and (23.2, 49, and 59)], respectively. As a result of the investigation, ozone was determined to be very effective for the removing of HS. However, ozonation alone was proven rather inefficient for the reduction of COD. O3/PAC process was considerably effective in the removal of COD and HS. The efficiencies of HS and COD uptake were predicted using Multiple regression. The model yielded a determination coefficient of 0.97 and 0.9, and a standard error of 4.53 and 3.69 for HS and COD values, respectively. (C) 2015 American Institute of Chemical Engineers Environ Prog, 35: 653-660, 2016