基金项目:
国家“十二五”科技支撑计划(2013BAC06B02);
国家自然科学青年基金(51309039);
国家重大科研仪器研制项目(61427804);
Project supported by National Twelfth-five Year Science and Technology Supporting Program of China(2013BAC06B02), Young Sciectist Fond of the National Natural Science Foundation of China (51309039), National Key Scientific Instrument and Equipment Development Project(61427804);
We developed the equipment of oxygen active species generation based on the technology to study the effects of key parameters on mass transfer rate, such as water temperature, the pressure difference of water inlet and outlet (pin-out), gas-liquid injection volume ratio (VG/VL), and pH value, through the calculation of mass transfer coefficients kLa. The results indicate that the mass transfer coefficient kLa of the oxygen active species mass transfer to water by hydrodynamic cavitation (t0~t1) is much higher than that in the subsequent water pipe (t1~t6). Thus the hydrodynamic cavitation plays a key role in the mass transfer process of oxygen active species to water. In addition, kLa first increases then decreases with the increase of water temperature (10~30 ℃), and increases with the increase of pressure difference (0.098~0.305 MPa) and gas-liquid injection volume ratio (0.025~0.125), but reduces with the increase of pH value (2.54~10.63). The maximum value of kLa is 10.62 s-1, when the water temperature is 20 ℃, pH is 2.52, pin-out is 0.305 MPa, VG/VL is 0.125. This research can optimize the design and application parameters of hydrodynamic cavitation gas-liquid mixed solvent technology.
KEY WORDS :advanced oxidation technology;strong electric field discharge;oxygen active species;hydrodynamic cavitation;mass transfer coefficient;
图3
不同水温对TO浓度的影响
Fig.3
Effect of different temperatures on TO concentrations
图4
不同水温对氧活性粒子溶解率的影响
Fig.4
Effect of different temperatures on reactive oxygen species dissolution rate
图5
不同水温下ln(\(\rho _{\text{L}}^{*}\)/(\(\rho _{\text{L}}^{*}\)-\(\rho _{\text{L}t}^{{}}\)))对t作图
Fig.5
Profile of ln(\(\rho _{\text{L}}^{*}\)/(\(\rho _{\text{L}}^{*}\)-\(\rho _{\text{L}t}^{{}}\))) versus time t under different temperatures
图10
不同pin-out下ln(\(\rho _{\text{L}}^{*}\)/(\(\rho _{\text{L}}^{*}\)-\(\rho _{\text{L}t}^{{}}\)))与t关系
Fig.10
Profile of ln(\(\rho _{\text{L}}^{*}\)/(\(\rho _{\text{L}}^{*}\)-\(\rho _{\text{L}t}^{{}}\))) versus time t under different pin-out
图11
不同pin-out下的传质系数
Fig.11
Mass transfer coefficients under different pin-out
图12
不同VG/VL对\({{\rho }_{\mathrm{TO}}}\)的影响
Fig.12
Effect of different VG/VL on \({{\rho }_{\mathrm{TO}}}\)
图14
不同VG/VL下ln(\(\rho _{\text{L}}^{*}\)/(\(\rho _{\text{L}}^{*}\)-\(\rho _{\text{L}t}^{{}}\)))与t的关系
Fig.14
Profile of ln(\(\rho _{\text{L}}^{*}\)/(\(\rho _{\text{L}}^{*}\)-\(\rho _{\text{L}t}^{{}}\))) versus time t under different VG/VL
图15
不同VG/VL下的传质系数
Fig.15
Mass transfer coefficients under different VG/VL
图16
不同pH值对\({{\rho }_{\mathrm{TO}}}\)的影响
Fig.16
Effect of different pH values on\({{\rho }_{\mathrm{TO}}}\)
水中的溶解率越小,结果如图17所示。
图17
不同pH值对氧活性粒子溶解率的影响
Fig.17
Effect of different pH values on reactive oxygen species dissolution rate
图18
不同pH值下ln(\(\rho _{\text{L}}^{*}\)/(\(\rho _{\text{L}}^{*}\)-\(\rho _{\text{L}t}^{{}}\)))和t的关系
Fig.18
Profile of ln(\(\rho _{\text{L}}^{*}\)/(\(\rho _{\text{L}}^{*}\)-\(\rho _{\text{L}t}^{{}}\))) versus time t under different pH values
表1
不同pH值下的传质系数kLaTable
1 Mass transfer coefficient under different pH values
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