Abstract
In this study, ultraviolet (UV), ozone techniques with hydrogen peroxide oxidant were used to treat the wastewater which is produced from South Baghdad Power Station using lab-scale system. From UV-H2O2 experiments, it was shown that the optimum exposure time was 80 min. At this time, the highest removal percentages of oil, COD, and TOC were 84.69 %, 56.33 % and 50 % respectively. Effect of pH on the contaminants removing was studied in the range of (2-12). The best oil, COD, and TOC removal percentages (69.38 %, 70 % and 52 %) using H2O2/UV were at pH=12. H2O2/ozone experiments exhibited better performance compared to the H2O2/UV experiments. The results showed that 20 min was the best exposure time with removal percentages of 89.79 %, 83.33 % and 70% for oil, COD and TOC, respectively, and the optimum value of pH was at pH=8, where the pollutants removal percentages (i.e. 74.48 %, 80 % and 73.33 % respectively for the same previous pollutants). H2O2/ozone experiments showed better removal efficiency than the H2O2/UV experiments.
Highlights
The continuous expansion in the hydrocarbon processes and the oil-related industries like car manufacturing, and oil refineries has led to increasing the risk of oil pollution on the aquatic environment[1]
Advanced oxidation process (AOP) is an efficient chemical treatment method for oil removal; AOP depends on formation of free radicals (HO) which is a powerful and non-selective oxidant
The first series of the experiments was to study the effect of UV exposure time on removal of oil, COD, TOC in wastewater in the range (0-100 min) by using advance oxidation (H2O2/UV) process
Summary
The continuous expansion in the hydrocarbon processes and the oil-related industries like car manufacturing, and oil refineries has led to increasing the risk of oil pollution on the aquatic environment[1]. In Iraq, for example, the maximum allowable limit for discharging hydrocarbons and oils into surface water is 10 mg/L [2].Oil can be existing in water in different forms: free oil, emulsion and soluble. Advanced oxidation process (AOP) is an efficient chemical treatment method for oil removal; AOP depends on formation of free radicals (HO) which is a powerful and non-selective oxidant. Two or more of these free radicals generators can be used in combination to achieve more efficient treatment method [10]. Combination of UV and hydrogen peroxide produces hydroxyl radicals by photolysis of H2O2 according to the following reaction [11]: H2O2+ hν
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