Method for cleaning filter membrane, and membrane filter
A filter membrane and membrane filtration technology, which is applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of increased filtration pressure, inability to fully prevent filter membrane clogging, and reduced processing flow rate
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0092] The usage specification is as follows and has Image 6 with Figure 7 In the membrane filtration device of the structure shown in , agar water in which 1 ppm of agar was dissolved was passed at a constant flow rate of 10 m / day, thereby performing filtration. figure 1 The change in filtration pressure (differential pressure) at this time is shown in . Since the filtration pressure (differential pressure) increased after the operation, backwashing was performed with limonene-containing water containing 1000 ppm limonene after thirty minutes of operation. As a result, as figure 1As shown, the differential pressure returns to almost zero.
[0093] After running similarly for thirty minutes, a backwash was performed using a cleaning solution containing 20 ppm of sodium hypochlorite. As a result, as figure 1 As shown, the drop in differential pressure is small. This result indicates that significantly superior cleaning efficiency can be obtained using limonene-containin...
Embodiment 2
[0103] A membrane filtration device having the same specification as that used in Example 1 was used except that the filtration membrane (diameter: 2.3 mm) was made of POREFLON (PTFE) produced by Sumitomo Electric Fine Polymer Co., Ltd. and had a pore size of 1.5 μm, by passing seawater with a turbidity of 1.18 NTU (seawater obtained at Shimizu Port, Shizuoka Prefecture) at a constant flow rate of 10m / day to perform filtration. figure 2 The change in filtration pressure (differential pressure) at this time is shown in .
[0104] Thirty minutes after the start of the operation, backwash was performed using limonene-containing water containing 1000 ppm limonene, and ultrasonic waves with a frequency of 40 kHz and an output power of 300 W were applied for 30 seconds, followed by bubbling for 1 minute ( figure 2 middle (a)). Then, every 30 minutes of operation, three times of backwashing with water and cleaning by applying ultrasonic waves for 30 seconds, followed by air bubbli...
Embodiment 3
[0108] Using a membrane filtration device with the same specifications as the membrane filtration device used in Example 1 (the pore size of the membrane is 2.0 μm), make the water with agar added (agar content is 1 ppm) with a turbidity of 0.24 NTU at a constant rate of 10 m / day. Traffic passes through, thereby filtering. image 3 The change in filtration pressure (differential pressure) at this time is shown in .
[0109] Thirty minutes after the start of operation, a backwash was performed for 30 seconds using a cleaning solution containing 20 ppm of sodium hypochlorite. Thirty minutes after the operation again (60 minutes after the start of the operation), backwashing was performed for 30 seconds using limonene-containing water containing 1000 ppm limonene. Such as figure 1 As shown, the reduction of differential pressure when using sodium hypochlorite aqueous solution for cleaning is small, and when using limonene-containing water for cleaning, the cleaning effect of ma...
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle diameter | aaaaa | aaaaa |
| pore size | aaaaa | aaaaa |
| diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More