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考察了膜 悬浮光催化降解反应器小试系统在处理自配废水的连续运行中催化剂活性的变化 .试验发现 ,经两周的连续运行 ,催化剂活性有明显降低 ,降为原催化剂活性的 1 4 % .分析引起催化剂活性降低的可能原因有 :催化剂颗粒的聚集、有机污染物和无机垢体在催化剂表面的附着 .采用超声波粉碎、次氯酸钠碱洗和盐酸酸洗的方法来恢复催化剂活性 .结果表明 ,采用 1 0 %的盐酸清洗可使催化剂活性恢复到初始值的 6 4 %左右 ,效果最明显 .推测由于水中硬度在催化剂表面形成的CaCO3沉淀是导致催化剂活性降低的最主要因素 .
The changes of catalyst activity in the continuous operation of self-made waste water treatment were investigated in a small-scale system of membrane-suspended photocatalytic degradation reactor. It was found that after two weeks of continuous operation, the activity of the catalyst decreased obviously and decreased to 1 4 % .Analysis of the possible reasons for the decrease of the catalyst activity include: agglomeration of catalyst particles, adhesion of organic pollutants and inorganic scale on the surface of the catalyst, ultrasonic crushing, sodium hypochlorite alkaline washing and hydrochloric acid pickling to restore the activity of the catalyst. , And the most obvious factor is that the catalyst activity is restored to about 14% of the initial value by using 10% hydrochloric acid for cleaning, which is the most obvious effect.