CAJ | 학술논문

首次通过系列黑暗条件下的膜分离空白试验对悬浮型光催化纳滤膜反应器中耦合分离膜操作压力的变化机理进行研究.耦合工艺中分离膜操作压力的变化主要由目标污染底物及其光催化降解中间产物的吸附、堵塞污染形成,与目标污染底物光催化降解速率以及中间产物的组成及数量随时间变化的关系密切,因而耦合分离膜初始操作压力的大小对其后续变化过程及变化规律影响颇大.由于耦合分离膜循环液中悬浮态光催化剂颗粒对耦合分离膜及被吸附其上的污染物分子强烈的冲刷作用,使得耦合分离膜操作压力在连续运行一定时间后下降至初始压力以下0.20～0.50kPa.在任何操作压力条件下,悬浮态光催化剂溶液均不对耦合分离膜形成膜污染现象,这与其在水相中的絮凝聚合过程有关.
수차통과계렬흑암조건하적막분리공백시험대현부형광최화납려막반응기중우합분리막조작압력적변화궤리진행연구.우합공예중분리막조작압력적변화주요유목표오염저물급기광최화강해중간산물적흡부、도새오염형성,여목표오염저물광최화강해속솔이급중간산물적조성급수량수시간변화적관계밀절,인이우합분리막초시조작압력적대소대기후속변화과정급변화규률영향파대.유우우합분리막순배액중현부태광최화제과립대우합분리막급피흡부기상적오염물분자강렬적충쇄작용,사득우합분리막조작압력재련속운행일정시간후하강지초시압력이하0.20～0.50kPa.재임하조작압력조건하,현부태광최화제용액균불대우합분리막형성막오염현상,저여기재수상중적서응취합과정유관.
The systematic studies on influencing mechanisms of changs in TMP (transmembrane pressure) of suspended nanofihration membrane reactor for treatment of H-acid aqueous solutions were innovatively performed through the series of blank membrane separation experiments under the dark conditions. It was indicated that the dramatic changes in the transmembrane pressures of the innovative suspended photocatalytic nanofiltration membrane reactor should be attributed to the membrane surface adsorption fouling as well as the interior blocking fouling of the given pollutant substrate and its resulting photocatalytic degradation and transformation intermediates generated during the coupled process, moreover, a strong relationship could be observed between the TMP changes and substrate time conversion rates and the components and concentrations of the circulation fluid of the coupled membrane cell, therefore, the initial transmembrane pressure of the coupled membrane separation process plays an predominantly important role in the chang rate and range subsequently. The transmembrane pressures significantly lower 0.20 to 0.50 bar than that of the initial one after a specific operation period du.e to the intensive and attractive shear effects of the suspended nanophotocatalyst particles in the circulation fluid of the coupled process on the substrate and intermediates molecules adsorbed onto the membrane. Because of the aggregation process, the TiO2 photocatalyst slurry solutions did not endanger the cleanity and high water permeability of the coupled separation membrane.