This paper presents the nonselective degradation of mechanically pretreated oily wastewater by hydrogen peroxide (H 2O 2) in the presence and absence of UV irradiation. The effect of chemical oxidation on wastewater biodegradability was also examined. The exclusive
use of H 2O 2 photolyzed by daylight results in quite efficient degradation rates for the low peroxide concentrations used. Higher hydrogen peroxide concentrations inhibit degradation of organic contaminants in the wastewater. The degradation rates of all contaminants
are relatively high with an advanced oxidation system (UV/H 2O 2), but degradation efficiencies are not distinguishably different when 20 or 45 minutes of UV irradiation is used. The excess of H 2O 2 used in the process can inhibit phenolic degradation
and may lead to the formation of a new phenolic fraction. The biodegradability of port wastewater did not increase significantly following the application of the advanced oxidation process.
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