Nanofiltration membrane regenerating method
A nanofiltration membrane and re-inspection technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of cleaning, scrapping, and a large amount of lye consumption, and achieve effective cleaning of membrane tubes and optimization Cleaning effect, good cleaning effect
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Embodiment 1
[0023] A nanofiltration membrane regeneration method, comprising the following steps:
[0024] Step 1: Clean the nanofiltration membrane with desalted water at 50±1°C, and check the pH value of the desalted water in the cleaning tank after cleaning for 20 to 40 minutes. If the pH>8, drain the desalted water in the cleaning tank 1 and the nanofiltration membrane , re-prepared 50±1°C desalinated water circulation cleaning for 20-40 minutes, checked the pH value of the desalinated water again, and repeated the above method for cyclic cleaning until pH≤8;
[0025] Step 2: Prepare an oxalic acid solution at 55±1°C and a pH of 2.5 to 4 to circularly clean the nanofiltration membrane, so that the hemifibers and impurities in the nanofiltration membrane are fully dissolved in the oxalic acid solution, and detect it every half an hour during the cleaning process The pH value of the solution, if the pH value of the solution is higher than 5, then add new oxalic acid to adjust the pH val...
Embodiment 2
[0029] A nanofiltration membrane regeneration method, comprising the following steps:
[0030] Step 1: Clean the nanofiltration membrane with desalted water at 50±1°C, and check the pH value of the desalted water in the cleaning tank after cleaning for 20 to 40 minutes. If the pH>8, drain the desalted water in the cleaning tank 1 and the nanofiltration membrane , re-prepared 50±1°C desalinated water circulation cleaning for 20-40 minutes, checked the pH value of the desalinated water again, and repeated the above method for cyclic cleaning until pH≤8;
[0031] Step 2: Prepare an oxalic acid solution at 55±1°C and a pH of 2.5 to 4 to circularly clean the nanofiltration membrane, so that the hemifibers and impurities in the nanofiltration membrane are fully dissolved in the oxalic acid solution, and detect it every half an hour during the cleaning process The pH value of the solution, if the pH value of the solution is higher than 5, then add new oxalic acid to adjust the pH val...
Embodiment 3
[0036] A nanofiltration membrane regeneration method, comprising the following steps:
[0037] Step 1: Clean the nanofiltration membrane with desalted water at 50±1°C, and check the pH value of the desalted water in the cleaning tank after cleaning for 20 to 40 minutes. If the pH>8, drain the desalted water in the cleaning tank 1 and the nanofiltration membrane , re-prepared 50±1°C desalinated water circulation cleaning for 20-40 minutes, checked the pH value of the desalinated water again, and repeated the above method for cyclic cleaning until pH≤8;
[0038] Step 2: Prepare an oxalic acid solution at 55±1°C and a pH of 2.5 to 4 to circularly clean the nanofiltration membrane, so that the hemifibers and impurities in the nanofiltration membrane are fully dissolved in the oxalic acid solution, and detect it every half an hour during the cleaning process The pH value of the solution, if the pH value of the solution is higher than 5, then add new oxalic acid to adjust the pH val...
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