水处理新课题——膜生物流化床

膜生物反应器是通过膜技术强化生物反应器的水处理新技术,具有出水水质好、占地面积少和便于自动化控制等优点,但它存在膜污染和能耗高的缺陷;三相生物流化床具有处理效率高、容积负荷大、传质速度快等优点,但它同样也存在出水悬浮物浓度高和载体易流失的缺陷,将膜分离技术和三相生物流化床有机结合是水处理领域的一个新课题.笔者在讨论膜生物反应器和生物流化床优缺点的基础上,探讨了结合后的膜生物流化床在膜污染、能耗、微生物活性等方面的优势及特点.

A New Project in Water Treating——Membrane-fluidized Bed Bioreactor

Membrane bioreactor is a new technology in water treatment,which uses membrane technology to reinforce the bioreactor.It has the advantages of high effluent quality,low occupation area and easiness of being automatically controlled.But it has the disadvantages of membrane pollution and high energy expense.Three-phase fluidized bioreactor has the advantages of high treating efficiency,loading and matter diffusion velocity.However,it also has some disadvantages of high suspending solid concentration in the effluent and the defect of carriers' being easily lost.The combination of the membrane separation technology and fluidized bed is a new task in the field of water treatment.Based on the discussion of the advantages and disadvantages of membrane bioreactor and fluidized bed,this paper also discussed the membrane-fluidized bed bioreactor,after the combination,in the aspects of membrane pollution,energy expense and the activities of the microorganisms.