A promising evaluation method for the detoxification effect of Fenton oxidation technology via tracking by-products of pollutants and corresponding acute toxicity

Abstract

The traditional method to evaluate the degradation effect of Fenton based on the decrease of parent pollutant concentration often cannot reflect the real detoxification effect of the system, which may also mislead the research on the reaction mechanism, degradation path and experimental parameter selection. In this study, a new method to evaluate the degradation efficiency of Fenton based on the biological survival rate of the system has been established by combining GC–MS/MS analysis for the type and concentration of intermediates and the toxicity prediction of organic compounds by TEST software. Based on the changes in biological acute toxicity during the dynamic process of degradation, we further studied the influence mechanism of catalyst dosage, H2O2 dosage, pH and carboxylic acid ligands on the effect of Fenton efficiency. The establishment of this method to evaluate the degradation efficiency of Fenton based on the biological survival rate of the system can not only continuously monitor the changes of intermediates in the degradation process, but also reverse guide and optimize the reaction parameters, so that the degradation path is more cost-effective and environmentally friendly.