MAZhen-kun,LIUYong-ze,ZHANGLi-qiu,et al.Microbubble Enhanced Ozonation for Removing Organic Matters from Secondary Effluent[J].China Water & Wastewater,2024,40(5):63-68.
Microbubble Enhanced Ozonation for Removing Organic Matters from Secondary Effluent
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第5期
Page:
63-68
Column:
Date of publication:
2024-03-01
- Keywords:
- onation; microbubble; reclaimed water; refractory organic matter; ozone mass transfer; ozone utilization efficiency
- Abstract:
- This paper compared the performances of different ozone aeration modes (microbubble aeration and conventional aeration) for removing organic matters from secondary effluent of a wastewater treatment plant, and investigated the ability of microbubbles for enhancing ozone mass transfer and hydroxyl radical generation. The continuous flow dynamic experiment results showed that the optimal treatment performances (effluent COD less than 5 mg/L) of microbubble ozonation (bubble diameter of 10-150 μm) and conventional ozonation (bubble diameter greater than 1 mm) were obtained when the dosage of ozone was 30 mg/L and 40 mg/L respectively, and the O3/COD values (the amount of ozone per unit COD consumption) were 1.3 and 2.2, respectively, indicating that microbubble aeration significantly reduced the treatment cost. The static experiment results showed that the microbubble ozonation removed 90.6% COD within 5 min when the ozone dosage was 3 mg/min. In contrast, the COD removal rate of conventional ozonation was only 75.4%. In addition, the ozone utilization rate of microbubble aeration reached 100%, which was much higher than that of conventional aeration. The microbubble aeration increased the ozone mass transfer coefficient from 0.176 kmol/(m3·h) to 0.335 kmol/(m3·h), and the yield of ·OH increased by 1.9 times compared to conventional aeration.
Last Update:
2024-03-01