Study on optimization of mass transfer enhanced by ceramic membrane ozone aeration

doi:10.19965/j.cnki.iwt.2023-0859

Abstract

Abstract:

Ozonation technology has problems such as low gas-liquid mass transfer efficiency and low ozone utilization. The improvement of ozone aeration conditions is an effective approach to enhance ozone mass transfer. In this regard, an experimental study of ozone aeration with ceramic membranes was carried out to characterize the microporosity and morphological structure of ceramic membranes, and to investigate effects of different operating conditions on ozone mass transfer. The results showed that the ozone mass transfer coefficient firstly increased and then decreased with the increase of inlet gas flow rate and gas-phase ozone concentration. The optimal conditions were 0.4 L/min and 28 mg/L. The hydrophobic modification of ceramic membrane surface could enhance the ozone mass transfer efficiency. Ozone solubility and mass transfer efficiency increased with the decrease of membrane pore size. With the increase of aeration pressure from 0.1 MPa to 0.5 MPa, the ozone mass transfer efficiency firstly increased and then decreased, and the optimal aeration pressure was about 0.3 MPa. The mechanism of ceramic membrane pressurized aeration to strengthen the ozone mass transfer was analyzed based on Young-Laplace equation.

Key words: ozonation process, ceramic membrane, aeration, mass transfer efficiency

摘要：

臭氧氧化技术存在气液传质效率低、臭氧利用率不高等问题，改进臭氧的曝气条件是强化臭氧传质效率的重要方法。进行了陶瓷膜臭氧曝气的试验研究，表征了陶瓷膜的微孔性与形态结构，探究了不同操作条件对臭氧传质效率的影响。结果表明：臭氧传质系数随进气流量、气相臭氧质量浓度的增加先增大后减小，最佳条件：进气流量为0.4 L/min，气相臭氧质量浓度为28 mg/L。陶瓷膜表面疏水改性可以提升臭氧传质效率，臭氧溶解度及传质效率随膜孔径的减小而增大，随着曝气压力从0.1 MPa提高到0.5 MPa，臭氧传质效率先增大后减小，最佳的曝气压力约为0.3 MPa，并基于杨氏方程分析了陶瓷膜加压曝气强化臭氧传质的机理。

关键词: 臭氧工艺, 陶瓷膜, 曝气, 传质效率

CLC Number:

X703.1

Yunfei MA, Jingyi ZHANG, Jianbing WANG, Xian ZHANG. Study on optimization of mass transfer enhanced by ceramic membrane ozone aeration[J]. Industrial Water Treatment, 2024, 44(8): 61-69.

马云飞, 张靖仪, 王建兵, 张先. 陶瓷膜臭氧曝气强化传质工艺优化研究[J]. 工业水处理, 2024, 44(8): 61-69.

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URL: https://gyscl.magtechjournal.com/EN/10.19965/j.cnki.iwt.2023-0859

https://gyscl.magtechjournal.com/EN/Y2024/V44/I8/61

Figures/Tables 19

Fig.1 Ozone aeration experimental device

Table 1 The parameters of ceramic membrane

陶瓷膜	平均孔径/nm	外径/mm	内径/mm	长度/mm	孔隙度/%
1号	100	12	8	100	29.34
2号	2 000	25	16	100	30.75

Fig.2 Images of two ceramic membranes（a） and SEM image of section of No. 1 ceramic membrane（b）

Fig.3 SEM of outer surfaces of ceramic membranes

Fig.4 EDS spectra of outer surfaces of two ceramic membranes

Fig.5 Effects of inlet flow rates on liquid phase ozone massconcentrations

Table 2 Ozone volume mass transfer coefficients at different gas flows

气体流量/（L·min^-1）	k _L a/min^-1	R ²
0.1	0.162 2	0.985
0.2	0.213 2	0.992
0.4	0.315 1	0.987
0.6	0.272 8	0.981

Fig.6 Effects of inlet ozone concentrations on liquid phase ozone concentrations

Table 3 Ozone volume mass transfer coefficients at different inlet ozone concentrations

气相臭氧质量浓度/（mg·L^-1）	k _L a/min^-1	R ²
15	0.102 9	0.988
21	0.127 2	0.994
28	0.213 2	0.998
35	0.169 9	0.992

Fig.7 Contact angles of membrane surfaces

Fig.8 Effects of hydrophilic ozone mass transfer on aerated membranes

Fig.9 Effects of hydrophilicity of aerated membrane on COD removal in wastewater

Fig.10 Effects of aeration head pore sizes on liquid ozone concentrations

Fig.11 Comparison of COD removal under different aeration head pore sizes

Table 4 Ozone volume mass transfer coefficients at different aeration head apertures

曝气头孔径	1号（100 nm）	2号（2 μm）	3号（20 μm）
k _L a/min^-1	0.206 8	0.162 2	0.119 8
R ²	0.99	0.985	0.991

Fig.12 Comparison of COD removal kinetic fit under different aeration head pore sizes

Fig.13 Comparison of calculated and measured bubble point pressure of aeration membrane with different pore sizes

Fig.14 Change curves of liquid phase ozone concentration under different aeration pressures

Table 5 Changes of inlet flow under different aeration pressures

曝气压力/MPa	0.1	0.2	0.3	0.4	0.5
进气流量/（mL·min^-1）	42	77	110	148	185

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