ZHAOMeng,WANGPan-xin,NINGChao,et al.Internal Circulating Fluidized Bed-Ozone Catalytic Oxidation Process for Treatment of Petrochemical Secondary Effluent[J].China Water & Wastewater,2023,39(1):26-33.
Internal Circulating Fluidized Bed-Ozone Catalytic Oxidation Process for Treatment of Petrochemical Secondary Effluent
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第1期
Page:
26-33
Column:
Date of publication:
2023-01-01
- Keywords:
- internal circulating fluidized bed; ozone catalytic oxidation; petrochemical wastewater; adsorption; three-dimensional fluorescence spectrum
- Abstract:
- An internal circulating fluidized bed-ozone catalytic oxidation process was used to treat the secondary effluent of petrochemical wastewater. The optimal operating conditions of the process were determined by single-factor experiments, and the effects of the ozone catalytic oxidation fluidized bed process were compared with the fixed bed process under the optimal operation conditions. The results showed that the fluidized bed process could more effectively degrade organic matter in petrochemical wastewater. Under the conditions of 40 g/L of catalyst dosage, 75 mg/（L·h） of ozone dosage and 1 h of reaction time, the TOC removal rate of the fluidized bed process was 46.47% and ozone utilization rate was 68%, while the corresponding values for the fixed bed process were only 21.73% and 39.8%, respectively. The catalyst dosage required to achieve the same TOC removal effect in fluidized bed process was only 1/10 of that in fixed bed process. The fluidized bed catalyst could adsorb 30.23% of TOC in the petrochemical wastewater within 1 h, and the fixed bed catalyst with the same dosage had no obvious adsorption effect on the TOC in the wastewater. Repeated experimental results indicated that ozone catalytic oxidation was the main way to remove pollutants by fluidized bed process. The results of three-dimensional fluorescence spectrum and UV254 analysis indicated that under the same conditions, the fluidized bed process had a stronger ability to catalyze ozone into active radicals than that of fixed bed process. The internal circulating fluidized bed-ozone catalytic oxidation process can substantially reduce the amount of catalyst, improve the ozone utilization efficiency, reduce the cost of wastewater treatment, and the treatment effect is stable.
Last Update:
2023-01-01