Photocatalytic degradation kinetics of naphthenic acids in oil sands process-affected water: Multifactorial determination of significant factors

摘要: Oil sands process-affected water (OSPW) is generated as a byproduct of bitumen extraction in Canada's oil sands. Due to the water's toxicity, associated with dissolved acid extractable organics (AEO), especially naphthenic acids (NAs), along base-neutral organics, OSPW may require treatment enable safe discharge environment. Heterogeneous photocatalysis promising advanced oxidation process (AOP) for remediation, however, predicting efficacy can be challenging due unique chemistry from different tailings ponds. The objective this work was study various factors affecting kinetics photocatalytic AEO degradation OSPW. rate varied significantly two sources, which could not accounted by differences composition, studied high resolution mass spectrometry (HRMS). effects inorganic constituents were investigated using factorial and response surface experiments, revealed that hydroxyl (HO) radical scavenging iron (Fe3+) bicarbonate (HCO3-) inhibited NA rate. concentration temperature on also evaluated terms Langmuir-Hinshelwood Arrhenius models; pH identified weak factors, while oxygen (DO) critical photo-oxidation reaction. Accounting all these variables, general empirical kinetic expression proposed, enabling prediction performance diverse sources