有机负荷和温度对膜生物反应器膜污染的影响

Effects of Organic Loading and Temperature on Membrane Fouling in Membrane Bioreactor

通过对比研究不同有机负荷和温度工况下膜污染情况,探讨设定适宜的有机负荷调控MBR膜污染的工程可行性。结果表明,适宜有机负荷区间内,反应器内膜污染物质含量随着有机负荷的增加逐渐升高,膜污染随之加重;但是过低的有机负荷会导致污泥解体现象严重,污泥粒径急剧减小,膜污染物质含量异常升高,引发更严重的膜污染;温度越低,膜污染越严重,同时低温更容易诱发多糖型膜污染。Real-time PCR分析发现Betaproteobacteria可能是引起膜污染的先锋物种。因此,控制适宜的有机负荷可以避免严重的膜污染,同时低温工况下应适当降低有机负荷。有望为实际MBR工程中膜污染的调控提供参考。

The membrane fouling conditions was studied compared with different organic loadings and temperature,the feasibility of membrane fouling control in MBR by selecting organic loading was investigated.The results showed that,the content of membrane foulants gradually increased with the increase of organic loading at the reasonable range,and the membrane fouling gradually aggravated in the MBR.More importantly,much too low organic loading led to extremely severe membrane fouling on account of sludge decomposition,as sludge decomposition resulted in sharp decrease of sludge size and significant increase of membrane foulants.Also,the lower the temperature was,the severer the membrane fouling happened.Moreover,it easily induced the polysaccharide membrane fouling at low temperature.Real-time PCR analysis showed that Betaproteobacteria might be the pioneer species of membrane fouling.Consequently,it can be concluded that severe membrane fouling can be avoid by selecting the reasonable organic loading,and it should partly decrease the organic loading at the low temperature.It is expected to provide reference for membrane fouling control in practical MBR projects.