Microdyn-Nadir GmbH, Wiesbaden, Germany.
Water Sci Technol. 2010;61(10):2575-80. doi: 10.2166/wst.2010.183.
In membrane bioreactors (MBR) for wastewater treatment, the separation of activated sludge and treated water takes place by membrane filtration. Due to the small footprint and superior effluent quality, the number of membrane bioreactors used in wastewater treatment is rapidly increasing. A major challenge in this process is the fouling of the membranes which results in permeability decrease and the demand of chemical cleaning procedures. With the objective of a chemical-free process, the removal of the fouling layer by continuous physical abrasion was investigated. Therefore, particles (granules) were added to the activated sludge in order to realise a continuous abrasion of the fouling layer. During operation for more than 8 months, the membranes showed no decrease in permeability. Fluxes up to 40 L/(m(2) h) were achieved. An online turbidity measurement was installed for the effluent control and showed no change during this test period. For comparison, a reference (standard MBR process without granules) was operated which demonstrated permeability loss at lower fluxes and required chemical cleaning. Altogether with this process an operation at higher fluxes and no use of cleaning chemicals will increase the cost efficiency of the MBR-process.
在用于废水处理的膜生物反应器（MBR）中，通过膜过滤实现活性污泥和处理水的分离。由于占地面积小和出水水质优异，用于废水处理的膜生物反应器的数量正在迅速增加。在这个过程中，一个主要的挑战是膜的污染，这会导致渗透性降低和需要化学清洗程序。为了实现无化学过程的目标，通过连续的物理磨损来去除污染层。因此，向活性污泥中添加颗粒（颗粒）以实现对污染层的连续磨损。在运行超过 8 个月后，膜的渗透性没有下降。实现了高达 40 L/（m²h）的通量。安装了在线浊度测量仪以用于出水控制，在整个测试期间没有变化。为了进行比较，还运行了一个对照（没有颗粒的标准 MBR 工艺），该对照在较低通量下表现出渗透性损失，并需要化学清洗。总的来说，这种工艺可以在不使用清洁化学品的情况下以更高的通量运行，从而提高 MBR 工艺的成本效益。
