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Changing flow direction method for blocking reverse osmosis membrane fouling under the scale inhibitor existing

A technology of reverse osmosis membrane and scale inhibitor, which is applied in the field of membrane separation in chemical engineering science, can solve the problems of reverse osmosis membrane fouling, etc., and achieve the effects of reducing the number of chemical cleaning of the membrane, prolonging the life of the membrane, and preventing membrane scaling

Inactive Publication Date: 2007-10-17
浙江凯锐环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding scale inhibitors for scale inhibition is not a panacea. The scale inhibition ability of scale inhibitors is limited by the supersaturation of the solution. If the solution exceeds a certain degree of supersaturation, scaling will also occur on the reverse osmosis membrane.

Method used

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  • Changing flow direction method for blocking reverse osmosis membrane fouling under the scale inhibitor existing
  • Changing flow direction method for blocking reverse osmosis membrane fouling under the scale inhibitor existing
  • Changing flow direction method for blocking reverse osmosis membrane fouling under the scale inhibitor existing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Install the reverse osmosis membrane unit, connect 6 membrane shells in series (RO1-RO6), and fill the membrane shells with ESPA-2521 membrane elements from Hyde Energy, as shown in Figure 1. In order to prevent the membrane element from moving due to the change of the raw water flow direction in the membrane casing, thrust rings are installed at both ends of the inlet and outlet of the membrane casing, and the thrust ring can well fix the membrane element in the membrane casing.

[0027] Connect the permeate pipelines of the 6 membrane shells in the reverse osmosis membrane unit, and collect and flow into the permeate pipelines. A flow meter is installed at the permeate outlet of the last reverse osmosis membrane shell, and the change of the product water flow rate with time is recorded when the system is running.

[0028] Three valves are installed in the reverse osmosis membrane unit: water inlet three-way valve, water outlet three-way valve and two-way regulating va...

Embodiment 2

[0039] In this embodiment, the amount of antiscalant in Example 1 is changed for testing. The system configuration is shown in Figure 1.

[0040] Weigh 61.47gCaCl 2 , 43.3g NaHCO 3 , 10.58 g NaNO 3 , 5.05gMgSO 4 Prepare 106L solution, and adjust solution pH to 7.6 with NaOH, the LSI index (Langelier Langelier saturation index) of solution is 1.19, and this solution is to CaCO 3 is supersaturated. The scale inhibition experiment was carried out with commercial scale inhibitor LB0100, and the dosage of scale inhibitor was 3mg / L.

[0041] Close the two-way regulating valve, adjust the outlet three-way valve to make the raw water flow upward, and then adjust the water inlet three-way valve to make the raw water flow positive and upward. Start the high-pressure pump, run the system, adjust the bypass valve and regulating valve, so that the inlet pressure is 15 bar, and the concentrate flow rate is 200L / h. At this time, the raw water flows in the forward direction in the six ...

Embodiment 3

[0048] In this embodiment, the flow rate of the concentrated solution in Embodiment 2 is changed for testing. The system configuration is shown in Figure 1.

[0049] Weigh 61.47gCaCl 2 , 43.3g NaHCO 3 , 10.58 g NaNO 3 , 5.05gMgSO 4 Prepare 106L solution, and adjust solution pH to 7.6 with NaOH, the LSI index (Langelier Langelier saturation index) of solution is 1.19, and this solution is to CaCO 3 is supersaturated. The scale inhibition experiment was carried out with commercial scale inhibitor LB0100, and the dosage of scale inhibitor was 3mg / L.

[0050] Close the two-way regulating valve, adjust the outlet three-way valve to make the raw water flow upward, and then adjust the water inlet three-way valve to make the raw water flow positive and upward. Start the high-pressure pump, run the system, adjust the bypass valve and regulating valve, so that the inlet pressure is 15 bar, and the concentrate flow rate is 300L / h. At this time, the raw water flows in the forward d...

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Abstract

The invention relates to a switching flow method for preventing the reverse osmosis membrane from fouling via a scale inhibitor, which connects in series plurality of branch putaminas to form a reverse osmosis membrane unit, the penetrating fluid tube of each branch putamina is connected and together flows into the penetrating fluid conduit, and in the process of operation of reverse osmosis system and in the interval smaller than membrane fouling induction period, the flow direction of water in the membrane unit is alternately changed to break the high concentration boundary layer built at the surface of the membrane to extend fouling induction period to prevent the reverse osmosis membrane from fouling. The permeability coefficient of the reverse osmosis membrane can be obtained, and then the retarding degree for the membrane fouling can be obtained by monitoring the penetrating fluid flow of the last breach putamina, based on the operation pressure and the osmotic pressure of the solution. The invention can prevent the membrane from fouling effectively, reduce the washing frequency for the commercial reverse osmosis system, prolong the using life of the membrane, and provide a simple method to reduce the run cost.

Description

technical field [0001] The invention relates to a switching flow method for retarding reverse osmosis membrane fouling in the presence of a scale inhibitor. The method of alternately changing the flow direction of raw water in the membrane destroys the membrane surface concentration boundary layer and prolongs the scaling induction period, thereby inhibiting the reverse osmosis membrane. Fouling. The invention provides a simple and feasible method for reducing the times of chemical cleaning of the membrane, prolonging the service life of the membrane and reducing the operation cost. The invention belongs to the technical field of membrane separation in chemical engineering science. Background technique [0002] In recent years, reverse osmosis desalination has been widely used in brackish water and seawater desalination, high-purity water in the electronics industry, drinking water and other fields. Because of its outstanding advantages such as low energy consumption, easy...

Claims

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Application Information

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IPC IPC(8): B01D65/08
Inventor 杨庆峰
Owner 浙江凯锐环保股份有限公司
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