Degradation of Caffeine and Dissolved Organic Carbon in RO Water and Treated Wastewater by UVC/H2O2 Process
Keywords:
Caffeine, DOC, UVC/H2O2Abstract
This research investigated the treatment of caffeine and dissolved organic carbon (DOC) using Ultraviolet C (UVC) photolysis and Ultraviolet C (UVC) photolysis in combination with hydrogen peroxide (H2O2). Degradation of caffeine and DOC was observed in the matrix solution of caffeine which was dissolved in both of RO water (RO+Caf) and treated wastewater (Eff+Caf). The results showed that degradation of caffeine in the matrix of RO+Caf and Eff+Caf using UVC or H2O2 alone could not be treated effectively. Conversely, the effective treatment occurred when the UVC radiation was combined with H2O2 (UV/H2O2). The maximum caffeine removal efficiencies of RO+Caf and Eff+Caf were 100% and 41.62% respectively, whereas the maximum DOC removal efficiencies of RO+Caf and Eff+Caf were 28.37% and 1.95% respectively. Because turbidity and color of Eff+Caf were higher than Ro+Caf these effect on the UVC light transmittance in the UVC/H2O2 reaction of caffeine degradation in Eff+Caf. In addition, it concluded that the DOC in the effluent could not be treated with the UVC/H2O2 technique. Increasing H2O2 dosage in UVC/H2O2 process was able to improve the caffeine removal efficiency in Eff+Caf. The removal efficiency presented 76.64% at H2O2 500 mg/l, and these were likely to be more effective if the H2O2 dosage was increased. On the other hand, increasing the dosage of H2O2 could not improve the efficiency of the DOC removal.
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