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Photooxidation of Benzene Structured Compounds: Influence of Substituent Type on Degradation Kinetic and Sum Water Parameters

In this paper the combined influence of substituent type and UV/H2O2 process parameters on the degradation of four aromatic water pollutants was investigated using 33 full factorial design and response surface methodology. Pollutants degradation kinetics was described by the quadratic polynomial model. According to the applied ANOVA, besides pH and H2O2 concentration, model terms related with the pollutant structure are found to be significant. For each of the pollutants were determined different optimal operating conditions and values of observed degradation rate constant, indicating that the structurally defined degradation pathway influence the overall process effectiveness. Biodegrability (BOD5/COD) and toxicity (TU) were evaluated before the treatment and at the reference time intervals t1/2(P), t3/4(P), t1/4(OC), t1/2(OC) corresponding to the real time required to reduce the concentration of parent pollutant and organic content for 1/4, 1/2 and ¾ of initial amount. Observed differences between pollutants are attributed to the structural differences.

wastewater; aromatic pollutants; degradation; optimization; toxicity; biodegradability

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