1. Raw material selection of mbr uf membrane

The raw materials of the mbr uf membrane can be divided into organic membranes and inorganic membranes, but the cost of inorganic membranes must be higher, so they are rarely used in my country. MBR membranes are generally organic membranes, and the raw materials for membrane production are high-pressure polyethylene, polypropylene, etc.

2.The choice of pore size of mbr uf membrane

The larger the relative molecular mass of the interception, the larger the original utrafiltration membrane flux, but the membrane flux may not necessarily be larger during long-term operation. Compared with 0.8μm membrane elements, membrane elements with a diameter of 0.2μm are more suitable for MBR systems. The main reason for the attenuation of the utrafiltration membrane flux is the communication effect. The smaller the relative molecular mass of the interception of the mbr uf membrane, the greater the flux attenuation rate.

The main factor of the long-term operation of the mbr uf membrane that causes the flux attenuation is the environmental pollution of the membrane module. The larger the relative molecular mass of membrane interception, the stronger the flux attenuation and the lower the repair rate of chemical water treatment. For immersed MBR components, reverse osmosis ro membrane or microfiltration membrane can be selected. Since the gel layer on the membrane surface can also have a filtering effect, when solving urban sewage, there will be no significant difference in the amount of water produced by the microfiltration membrane component or the reverse osmosis ro membrane after the solution, so the immersed MBR component is generally selected as 0.1 ~0.4μm microfiltration membrane.

3. Choose according to the total number of diaphragms

Total number of diaphragms n=Q÷N÷Ax1000Q:
Q=daily water flow t/dN:
N=membrane flux l/m2dA:
A=The total area of the diaphragm is too large (commonly divided into 1.5, 0.8 square meters, and 2, 1.6, 1.0, 0.9 square meters).
Since the selection of the total membrane area is related to the construction of the membrane pool, the depth of the membrane pool must be clarified before the selection. The membrane pool of 3-3.5 meters generally chooses 1.5 square meters of membrane, and the membrane pool of 2.2-2.5 meters can choose 0.8-1.0 square meters. Rice film. The civil construction pond is generally 1.5 meters of membrane, and the steel box tank is 0.8 square meters of membrane.

When choosing the model and specification of the membrane, the choice must be made according to the specific manufacturing requirements, so that the resolved water meets the consumer's application requirements.