悬浮床光催化—膜分离反应器中膜污染的控制

Study on Membrane Fouling Control in a PCRMS

悬浮床光催化—膜分离反应器中膜污染的主要因素是催化剂附着和有机物污染 ,采用“水洗 +碱洗”的方法可以使膜阻力降低到清洁膜的水平。“间歇水逆洗 +膜下曝气”的方法可有效控制膜的污染。在逆洗周期 /时间为 30min/ 2 .5min ,水逆洗强度 1.6 7× 10 5m/s,膜下曝气强度 4.17× 10 4 m/s的操作条件下 ,膜过滤阻力上升速率为 1.46× 10 6m-1·s-1。

This paper investigated the membrane fouling and its control during the continuous operation of a recently developed photocatalytic oxidation slurry reactor coupled with membrane separation. Membrane fouling was ascribed to catalyst entraping and organic matters' adsorption. Water rinsing followerd by NaClO alkaline rinsing was found effective to recover the permeability of membrane. Intermittent backwash aided by coarse bubbling under membrane module could effectively decrease membrane fouling rate. Under the operational conditions as filtration/backwash intervals of 30min/2.5min, backwash flux of 1.67×10 5m/s and bubbling intensity under membrane module of 4.17×10 4m/s, the increasing rate of membrane filtration resistance, which was used for evaluate membrane fouling rate, was 1.46×10 6m -1·s -1.