Why does the water production of MBR membrane system fluctuate up and down?
The fluctuation of water production in MBR membrane system may be caused by various factors, and the following is a detailed analysis of the main reasons:
1. The impact of initial system startup or offline cleaning:
When the MBR membrane system is first started, due to the presence of air in the new membrane tube, filtered water needs to be slowly filled into the tube, which can cause fluctuations in water production.
Similarly, after offline cleaning, there will also be air inside the membrane tube, so the fluctuation will gradually disappear after a period of normal operation.
2. Membrane fouling and blockage:
With the operation of MBR membrane system, microorganisms, organic matter, inorganic matter, etc. in water will form fouling on the membrane surface, leading to membrane pore blockage and affecting membrane permeability. This blockage phenomenon will intensify over time, thereby reducing water production.
In addition, if the organic matter, particulate matter, or microbial content in wastewater increases, the MBR membrane may be contaminated faster, leading to a decrease in water production.
3. Operating conditions and system design issues:
When the operating conditions of the MBR membrane system, such as flux, recovery ratio, pressure, etc., are not set properly or malfunction occurs, it may lead to a decrease in system efficiency, which in turn can cause fluctuations in water production.
Meanwhile, if the design of the MBR membrane system is unreasonable, such as improper selection of membrane components and setting of aeration rate, it may also lead to excessive pressure or wear on the membrane components during operation, thereby affecting water production.
4. Other reasons:
The intake of the water pump and the presence of air in the suction pipeline or low suction pressure may also cause fluctuations in water production.
Incorrect flow indication is also a factor that cannot be ignored, and it is necessary to calibrate the flow meter to ensure accuracy.
In summary, the main reasons for the fluctuation of water production in MBR membrane systems include the impact of initial start-up or offline cleaning, membrane fouling and blockage, operating conditions and system design issues, and other factors. In order to ensure the stable operation and efficient water production of the MBR membrane system, it is necessary to regularly inspect and maintain the system, and promptly solve any problems that arise.