Method for evaluating property of reverse osmosis water treatment medicament based on differential pressure
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A technology for reverse osmosis water and chemical treatment, which is applied to measuring devices, instruments, scientific instruments, etc., and can solve the problem of not finding sensitive indicators of chemical properties
Inactive Publication Date: 2014-08-06
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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[0005] Therefore, the root cause of the above-mentioned shortcomings of the existing reverse osmosis water treatment agent evaluation method is that there is no sensitive index that can reflect the performance of the agent scientifically and accurately.
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Embodiment 1
[0049] Test device: using figure 1 A test device for quality evaluation of antiscalants in reverse osmosis water treatment shown in .
[0050] Test method: Ladder drainage method (increasing the water quality ion content in the influent water by partially discharging the fresh water and returning the concentrated water to the water inlet tank).
[0051] Test water: by using desalinated water and chemicals (CaCl 2 , MgSO 4 , NaHCO 3 etc.), the water quality of the test water is as follows:
[0052]
[0053] Contrast test content: Take blank (no scale inhibitor added) and add a scale inhibitor as a contrast test.
[0054] Specific operation:
[0055] (1) Combine desalinated water and chemicals (CaCl 2 , MgSO 4 , NaHCO 3 etc.) to be prepared as test water without adding antiscalant (blank), and stored in test water tank 2 and make-up water tank 3.
[0056] (2) Will figure 1 The water outlet valve K3 of the test water tank, the water inlet valve K4 of the security fil...
Embodiment 2
[0064] Test device: using figure 1 A test device for quality evaluation of antiscalants in reverse osmosis water treatment shown in .
[0065] Test method: Ladder drainage method (increasing the ion content of the incoming water by partially discharging the fresh water and returning the concentrated water to the incoming water tank).
[0066] Test water: by using desalinated water and chemicals (CaCl 2 , MgSO 4 , NaHCO 3 etc.), the water quality of the test water is as follows:
[0067]
[0068] Contrast test content: The blank (no scale inhibitor added) and three scale inhibitors were used as comparative tests.
[0069] Specific operation:
[0070] (1) Combine desalinated water and chemicals (CaCl 2 , MgSO 4 , NaHCO 3 etc.) to be prepared as test water without adding antiscalant (blank), and stored in test water tank 2 and make-up water tank 3.
[0071] (2) Will figure 1 The water outlet valve K3 of the test water tank, the water inlet valve K4 of the security fi...
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Abstract
A method for evaluating the property of a reverse osmosis water treatment medicament based on differential pressure comprises the following steps: adding experimental water into a scale inhibitor, taking the mixture as supplied water during the reverse osmosis process, injecting the supplied water into a reverse osmosis module, and separating to produce concentrated water and plain water while continuously measuring and recording the differential pressure between the concentrated water and the supplied water during the process; under the same water quality condition and experimental operation, changing the variety of the added scale inhibitor, and repeating the above process; evaluating the property of the scale inhibitor according to the variation situation of the differential pressure between the concentrated water and the supplied water along with time when different scale inhibitors are adopted. The method is based on an on-line differential pressure gauge with reliable quality and high precision, and can be used for sensitively reflecting the sediment adhering situation of a reverse osmosis device in a real-time manner, so as to further evaluate the property of the reverse osmosis water treatment medicament. Compared with the conventional other evaluation methods, the evaluation method based on the differential pressure is high in precision, excellent in repeatability, quick in evaluation, and simple and convenient in operation, and can be used for comprehensively investigating the scale inhibition property, compatibility and long-term application performance of the reverse osmosis water treatment medicament.
Description
technical field [0001] The invention relates to a method for evaluating the performance of reverse osmosis water treatment agent based on pressure difference. Background technique [0002] With the increasingly serious water pollution, reverse osmosis pure water technology has become one of the most promising technologies to solve the shortage of water resources. In order to slow down or inhibit membrane fouling and ensure the long-term effective operation of the reverse osmosis system, it is necessary to add reverse osmosis water treatment chemicals, so the evaluation method of reverse osmosis water treatment chemicals is very important. The currently widely used evaluation methods for reverse osmosis scale inhibitors include static evaluation method and dynamic evaluation method. Static evaluation methods include volumetric flask method, bubbling method, evaporative concentration method, turbidity method, pH shift method and critical pH method, etc.; dynamic evaluation me...
Claims
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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 杨麟刘娟杜玉辉余芬孙婷婷郭思学
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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