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.
微气泡强化臭氧去除污水厂二级出水中的有机物
- Title:
- Microbubble Enhanced Ozonation for Removing Organic Matters from Secondary Effluent
- Keywords:
- onation; microbubble; reclaimed water; refractory organic matter; ozone mass transfer; ozone utilization efficiency
- 摘要:
- 以实际污水厂二级出水为处理对象，对比不同臭氧曝气方式（微气泡曝气和常规曝气）对污水中有机物的去除效果，同时考察微气泡对臭氧传质以及自由基产生的强化能力。连续流动态实验结果表明，微气泡曝气（气泡直径d=10~150 μm）与常规曝气（d>1 mm）分别在30和40 mg/L臭氧投量下达到最佳处理效果（COD<5 mg/L），此时O3/COD（表征去除单位COD所需臭氧量）值分别为1.3和2.2，微气泡曝气可以显著降低处理成本。静态实验结果表明，当臭氧投量为3 mg/min时，微气泡曝气在5 min内可去除90.6%的COD，而常规曝气的去除率仅为75.4%。同时发现，反应过程中微气泡曝气的臭氧利用率达到100%，远高于常规曝气；微气泡曝气使臭氧传质系数从0.176 kmol/（m3·h）提高到0.335 kmol/（m3·h），·OH产量较常规曝气提高了1.9 倍。
- 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.
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