Research on Ozone Oxidation-Anaerobic Degradation of Isophthalic Acid
The Isophthalic acid(IA)pretreatment method with ozone oxidation as an enhanced technology was studied in this paper.It has been revealed that temperature and ozone flow rate are positively correlated with the removal rate of IA,but pH and anion concentration are basically negative.Under the conditions of IA concentration of 200 mg/L,O3 concentration of 40 mg/L,O3 flow rate of 800 mL/min,pH of 7 and temperature of 20℃,the removal efficiency of IA could reach 90.68％and conform to the first-order reaction kinetics.The quenching experiment showed that the active component of ozone oxidation was·OH,and ozone direct oxidation accounted for only about 20％.The ozone-oxidized IA wastewater was coupled with UASB reactor for anaerobic biodegradation,the acclimation time was shortened by half,and the removal rate was about 94％.
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