光催化陶瓷平板膜反应器临界通量运行膜分离性能  

Membrane separation performance of a photocatalytic ceramic flat sheet membrane reactor under critical flux operation

作　　者：杨涛[1,2] 谢瑶 乔波 李国朝[1,2] 刘芬[1,2] 

机构地区：[1]九江学院化学与环境工程学院,九江332005 [2]江西省生态化工工程技术研究中心,九江332005

出　　处：《膜科学与技术》2017年第5期14-20,共7页Membrane Science and Technology

基　　金：国家自然科学基金项目(21566013)

摘　　要：针对光催化膜反应器中膜污染特性,采用通量阶式递增法测定了不同催化剂浓度及光照强度下光催化陶瓷平板膜反应器中临界膜通量的大小,对比了临界和超临界通量运行中膜分离性能.研究结果表明:当催化剂浓度为0.3g/L时,光照强度越高,临界通量越高.在临界通量为75L/(m^2·h)下运行相比超临界通量而言,其稳定运行周期更长,渗透出的滤液体积更多.临界通量运行过程中膜污染首先经历缓慢增长过程,随后变为加速膜污染过程.临界及超临界通量运行对UV254及UV436污染物总去除率均可以达到92%及98%以上,对DOC总去除率分别为72%及76.2%.临界通量运行时的总阻力、可逆污染阻力及不可逆污染阻力都低于超临界通量下对应的阻力,临界通量运行可有效提高光催化膜反应器中膜分离性能.In order to study the membrane fouling characteristics of a photocatalytic membrane reactor,the critical fluxes of a ceramic flat sheet membrane employed in a photocatalytic reactor were measured by the method of stepwise flux increase at different catalyst concentrations and light intensities.The membrane separation performances in the critical and supercritical flux operation modes were compared.The results show that at a catalyst concentration of 0.3 g/L,the critical flux increases with increasing light intensity.When compared with operation under supercritical flux conditions,longer operation cycles and more permeate were found at a critical flux of 75 L/（m^2·h）.In the critical flux running mode,the membrane fouling first experienced a slow growth but subsequently accelerated.While running with either critical or supercritical fluxes,the total removal ratios of pollutants UV254 and UV436 exceeded 92% and 98%,respectively.The total removal rates of DOC were 72% and 76.2% for critical and supercritical fluxes,respectively.The total,reversible and irreversible fouling resistances at critical flux were all lower than those at supercritical flux.Thus the membrane separation performance in a photocatalysis membrane reactor can be effectively enhanced by operation under critical flux conditions.

关 键 词：陶瓷平板膜 光催化 临界通量 膜污染 

分 类 号：X703.1[环境科学与工程—环境工程] TQ028.8[化学工程]