【摘要】 基于光催化技术和磁场能够改善污水处理效果的性质,开发了一种光磁耦合污水处理装置。紫外线强度分布的设计计算采用多点源叠加近似辐射模型;磁感应强度的产生选用亥姆霍兹线圈,并采用MATLAB对反应器的磁场进行了磁场强度分布的可视化模拟;采用流体力学软件CFD对装置内流场进行了数值模拟。结果表明,灯管之间的反应器壁附近区域的紫外线强度最小,而在3根紫外灯管间的区域紫外线强度较强且相对均匀;亥姆霍兹线圈内部磁场可近似作为匀强磁场;在该装置反应区存在循环流,有利于提高光磁耦合反应速率。对反应器效果进行验证表明,该反应器对污水的脱色率和COD去除率均较高,磁性光催化剂回收率达到97%以上;光磁耦合法废水处理效果明显高于磁场和光催化作用单独处理效果。更多还原

【Abstract】 Based on the photocatalysis technology and magnetic field,a novel reactor was designed to improve the effect of flocculation. Multi-point source summation radiation model was employed to design and calculate the ultraviolet light intensity distribution. The Helmholtz coil was used to provide magnetic field. And the visualization simulation of magnetic intensity distribution was done by MATLAB. The flow field of the wastewater in the reactor was simulated numerically by the CFD software. The results demonstrated that the lowest ultraviolet doses area was close to the wall of reactor on the central axes between the UV lamps. The ultraviolet doses were stronger and relatively uniform among the three UV lamps. The magnetic field distribution in Helmholtz coil could be perceived as the uniform one. The circulation flow,which existed in the reaction zones of the reactor,had the advantage of improving the reaction rate of coupling between magnetic field and photocatalysis. Finally,the effect of the reactor was tested. The removal rates of decolorization and COD were both high. The recovery of the magnetic photo catalyst was more than 97%. The treatment effect of magnetic field and photocatalysis coupling technology was significantly higher than that of magnetic field or that of photocatalysis individually.更多还原