| Popis: |
Combination of different systems of advanced oxidation processes (AOPs) were tested for the treatment of wastewater collected from an oil recycling plant. Oxidation systems were monitored by the global parameters like COD, TOC, VOCs, and UV-light absorbency at 254 nm. Different dosages of oxidants were supplied in a quest finding the optimal conditions to achieve the maximum removal of pollutants from the wastewater. UV-light with the combination of two oxidants, i.e. hydrogen peroxide and ozone proved the highest COD and TOC removal efficiency (>90%). UV/H 2 O 2 , with higher stoichiometric dosage of peroxide, also succeeded in achieving 70% removal efficiency for the same parameters. Ozone induced degradation system (UV/O 3 ), even with a high dosage of oxidant, showed the least COD removal efficiency (≈50%), however, the same system showed a little bit higher trend (≈60%) in TOC removal efficiency. Low operating pH conditions favored the efficiency of peroxide induced degradation, while the same might have hindered the efficiency of ozone induced degradation system. Amount of TCE was reduced to 80%, from 5 to 0.02 ppm, with the application of high dosage of peroxide in UV/H 2 O 2 system. Comparative statement drawn on the basis of energy consumption sketches suggested that the oxidative degradation pattern of UV/H 2 O 2 /O 3 system was the most cost efficient than the other ones tested. |
