光催化对多通道陶瓷膜错流超滤去除腐植酸膜污染的影响

发布时间：2019-05-24 03:17

【摘要】：为研究光催化作用对多通道陶瓷超滤膜去除水中腐植酸膜污染行为的影响,采用光催化陶瓷膜组合工艺,考察了不同光催化剂浓度下膜通量、污染物去除率、膜污染模式、膜污染阻力变化趋势以及在线反冲洗对膜通量变化的影响。结果表明:光催化可有效减缓陶瓷膜通量衰减程度,并提高污染物去除率;催化剂浓度为0.4g/L时膜通量衰减最小,最终相对膜通量达58.6%,催化剂浓度为0.6g/L时污染去除率最高,其中DOC为76.5%,UV254为87.3%,UV436为96.8%;光催化膜工艺在过滤初期经过短暂膜堵塞及过渡阶段后,膜污染以污染物在膜表面沉积为主;光催化可明显减低膜污染总阻力及可逆污染阻力;光催化作用下在线反冲洗对膜通量的恢复作用较小,但每次反冲前的膜通量衰减程度也小,使得在周期性在线反冲洗工艺中,光催化作用下的膜通量整体运行区间明显高于无光催化时的情况。
[Abstract]:In order to study the effect of photocatalysis on the removal of humic acid membrane from water by multi-channel ceramic ultrafiltration membrane, the membrane flux, pollutant removal rate and membrane fouling mode under different photocatalyst concentrations were investigated by photocatalytic ceramic membrane combination process. The change trend of membrane fouling resistance and the effect of on-line backwashing on membrane flux. The results show that photocatalysis can effectively slow down the attenuation of ceramic membrane flux and improve the removal rate of pollutants. When the catalyst concentration was 0.4g/L, the membrane flux attenuated the smallest, and the final relative membrane flux reached 58.6%. When the catalyst concentration was 0.6g/L, the pollution removal rate was the highest, in which DOC was 76.5%, UV254 was 87.3%, UV436 was 96.8%. After temporary membrane blockage and transition stage in the initial stage of filtration, the membrane fouling is dominated by pollutants deposited on the surface of the membrane, and photocatalysis can obviously reduce the total resistance and reversible fouling resistance of the membrane. Under the action of photocatalysis, the recovery effect of on-line backwashing on membrane flux is small, but the attenuation degree of membrane flux before each recoil is also small, so that in the periodic on-line backwashing process, The overall operation range of membrane flux under photocatalysis is significantly higher than that without photocatalysis.
【作者单位】：九江学院化学与环境工程学院;江西省生态化工工程技术研究中心;
【基金】：国家自然科学基金项目(21566013)
【分类号】：X703

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