MBR Membrane Bioreactor Module PVDF Material Long Serving Life
In the field of sewage treatment and water resource reuse, MBR, also known as Membrane Bio Reactor, is a new water treatment technology that combines activated sludge process with membrane separation technology. There are various types of membranes, classified according to their separation mechanisms, including reaction membranes, ion exchange membranes, permeable membranes, etc; According to the properties of membranes, there are natural membranes (biofilms) and synthetic membranes (organic and inorganic membranes); According to the structural types of membranes, there are flat plate type, tube type, spiral type, hollow fiber type, etc.
Solid liquid separation membrane bioreactor is the most widely and deeply studied type of membrane bioreactor in the field of water treatment. It is a water treatment technology that uses membrane separation process to replace the secondary sedimentation tank in traditional activated sludge process. In traditional wastewater biological treatment technology, sludge water separation is completed by gravity in the secondary sedimentation tank, and its separation efficiency depends on the settling performance of activated sludge. The better the settling performance, the higher the sludge water separation efficiency. The settling property of sludge depends on the operating conditions of the aeration tank, and improving the settling property of sludge requires strict control of the operating conditions of the aeration tank, which limits the applicability of this method. Due to the requirement of solid-liquid separation in the secondary sedimentation tank, the sludge in the aeration tank cannot maintain a high concentration, generally around 1.5-3.5g/L, which limits the biochemical reaction rate.
The hydraulic retention time (HRT) and sludge age (SRT) are interdependent, and increasing volumetric load and reducing sludge load often create a contradiction. The system also generates a large amount of residual sludge during operation, and its disposal cost accounts for 25% to 40% of the operating cost of the sewage treatment plant. Traditional activated sludge treatment systems are also prone to sludge expansion, resulting in suspended solids in the effluent and deteriorating water quality.
In response to the above issues, MBR combines membrane separation technology with traditional biological treatment technology. MBR achieves the separation of sludge retention time and hydraulic retention time, greatly improving solid-liquid separation efficiency. Moreover, due to the increase in activated sludge concentration in the aeration tank and the emergence of specific bacteria (especially dominant bacterial groups) in the sludge, the biochemical reaction rate is increased. At the same time, by reducing the F/M ratio to reduce the amount of excess sludge generated (even to zero), many prominent problems existing in traditional activated sludge processes have been basically solved
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