Composition of ultrafiltration system

Ultrafiltration systems typically consist of ultrafiltration membrane components, water tanks, raw water pumps, backwash pumps, valves, pipelines, etcMonitoring instrumentsComposition of control system.

The functions of each component:

1water tank:The intermediate water tank serves as a buffer for the inflow or outflow of the system.

2raw water pump:Ultrafiltration membrane relies on pressure difference as the driving force for filtration. When the water pressure and flow rate of the raw water cannot meet the filtration requirements, the system needs to increase the water pressure by adding a water pump to reach the pressure of ultrafiltration inlet water（0.1-0.3Mpa）And traffic requirements; Selection of raw water pump: Select the pump head and flow rate based on the required inlet working pressure, transmembrane pressure difference, and water flow rate in the ultrafiltration system design. Generally, the head and flow rate of the water pump should be equal to or slightly greater than the design water supply and working pressure to meet the normal operation of the ultrafiltration system

3. Backwash pump: After running the ultrafiltration membrane for a period of time (20-60 minutes), there are small particles, impurities, colloids, microorganisms, and blockages on the inner wall of the membrane tube and the filtering micropores, causing the water flux to gradually decrease. In order to discharge these pollutants from the membrane tube and restore the water energy of the ultrafiltration membrane, a more effective method is to backwash the ultrafiltration membrane regularly. The amount of backwash water should be 2-3 times larger than that during normal water production (200-300L/m)2.H）Only in this way can the pollutants be backwashed out to the greatest extent possible, and the backwash pump plays this role,

4. Circulating pump: When the inlet turbidity or suspended solids (SS) are high, the ultrafiltration membrane adopts cross flow filtration, which has internal circulation and external circulation. When internal circulation is used, a circulating pump is needed to achieve internal circulation.

5. Metering pump: When chemical sterilization is required for backwashing, the metering pump quantitatively draws the chemical from the metering box and pumps it into the backwashing water pipeline.

6chemical cleaning pump,The selection of chemical cleaning pumps is similar to that of backwashing pumps, but it should be noted that the material of the pump body should be able to withstand the dissolution and corrosion of chemical reagents

7Valves: In order to achieve the on/off of the system water circuit, the size of the flow rate, and the switching of the water flow direction, valves are set at appropriate positions on the system pipeline. Valves include manual valves such as ball valves, disc valves, globe valves, regulating valves, gate valves, pressure reducing valves, etc. Automatic valves include solenoid valves, pneumatic disc valves, electric valves, etc.

8Monitoring instruments: instruments, sensors, etc. that monitor various operating parameters of the monitoring system, such as pressure gauges, flow meters, turbidity meters, level gauges, pressure switches, thermometers, etc