臭氧-活性炭投加对MBR混合液特性及膜污染的影响研究

通过对比实验考察了O_3和PAC投加对MBR工艺中陶瓷膜污染及污泥混合液特性的影响,并探讨了O_3/PAC投加抑制陶瓷膜污染的机理。结果表明:单独O_3、单独PAC及O_3/PAC的联合投加将MBR系统的单周期运行时间分别延长了30%、22%、43%,有效降低了MBR系统跨膜压差的增长速率;O_3和PAC的单独作用及协同作用均有效控制了MBR混合液中EPS、SMP的累积,降低了混合液黏度,在一定程度上减缓了陶瓷膜污染;此外,O_3/PAC的投加改变了膜表面上由EPS和SMP形成的凝胶层特性,从而有效地抑制了MBR系统陶瓷膜污染。

EFFECT OF OZONE/ACTIVATED CARBON ON MIXTURE LIQUOR CHARACTERISTIC AND MEMBRANE FOULING OF MBR

The effects of O3 and PAC addition on the membrane fouling and the characteristics of the sludge mixture were investigated by parallel test,and the inhibition mechanism of ceramic membrane pollution by adding O3/PAC were discussed.The results showed that the single cycle time of MBR extended 30％,22％,43％,respectively,by dosing O3,PAC and O3/ PAC which effectively reduced the growth rate of transmembrane pressure in MBR system.The effect of O3 and PAC on the EPS and SMP in the MBR mixture was controlled by the interaction and synergistic effect,and the viscosity of the mixed solution was decreased and the membrane fouling was reduced to a certain extent.In addition,the addition of O3/PAC changed the properties of gel layer formed by EPS and SMP,which effectively inhibited the contamination of MBR ceramic membrane.