Abstract
Chlorine dioxide (ClO2) bleaching wastewater from bagasse brings a threat to human health. The intimate coupling of photocatalysis and biodegradation (ICPB) as a prospective green technique can remove environmental pollutants. Therefore, this study innovatively integrates functional bacteria with the ICPB system (ICPFB) and discusses the degradation mechanism, pathway, kinetic model, and microbial response behavior of the system to wastewater. The results show that the ICPFB system can simultaneously remove 95% absorbable organic halogen (AOX), 91% COD and 85% dissolved organic carbon (DOC), outperforming single photocatalysis (AOX 72%, COD 80%, DOC 68%) and biodegradation (AOX 41.4%, COD 66%, DOC 45%). Meanwhile, the reaction kinetics model of the ICPFB system is dC/dt = -KC1.22. According to the GC-MS analysis of degradation products, the degradation of organic compounds in wastewater involves gradual dechlorination and aromatic ring opening. Lastly, the Biofilm analysis shows that the functional bacteria possess abilities of dechlorination, aromatic ring opening and carbon oxidation.
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