Membrane element and water treatment device

Technical Field

The invention relates to a membrane element and the water treatment device.

Background Art

Reverse osmosis membrane element is membrane water treatment technology of the core part, the microorganism in the water can be removed, ions, and the like, pure water can be obtained. CN   104084048A and CN   104096483A of the reverse osmosis membrane element of a Chinese Patent application has been described. CN   104084048A the membrane disclosed in the structure of the component of the please refer to Figure 1 and Figure 2.

Content of the invention

Technical problem

However, CN   104084048A and CN   104096483A a membrane element disclosed in the following technical problem. enters the water graticule mesh electrode are arranged in the water inlet end of the part, the part of the water, when cleaning the membrane element can not reach the effect; in addition, are arranged two end electrodes inside the film element, after long-term operation, the diaphragm is formed to the surface of the inorganic salt scaling, a breakable ring membrane surface of the separation layer, the separation performance of the membrane so as to produce a certain amount of risk.

Technical solution

The present invention provides the following technical scheme.

According to the 1st aspect of the invention, a membrane element, the membrane element having a diaphragm, an inlet electrode and pure water electrode, the inlet electrode and the pure water electrode is respectively connected with two poles of the power supply, characterized in that the membrane element is located on the outside of the pure water side of the diaphragm is provided with pure water electrode, is located on the outer side of the membrane element is provided with the water inlet side of the diaphragm inlet electrode.

The film element as described above, wherein the water inlet end of the electrodes is $winding on the membrane or the filament electrode of the peripheral wall the mesh electrode.

The film element as described above, wherein the pure water end electrode is filose, mesh or sheet.

The film element as described above, wherein the film element also includes pure water conducting Buhe enters the water graticule mesh , the pure water pure water the distribution in states end of the cloth guide on the electrode.

The film element as described above, wherein the water inlet end electrode is helically wound or in the manner of sleeve electrode is the peripheral wall of the film element.

The film element as described above, wherein the membrane is a reverse osmosis membrane or a nanofiltration membrane.

The film element as described above, the most outer side of the diaphragm and the water inlet end of the is provided with a water-permeable protective layer between the electrodes.

The film element as described above, the protective layer material is cloth guide and/or grid.

The film element as described above, the membrane element is formed by rolling the tubular element, the inlet water flow along the membrane element into the gap of the two end parts of the membrane element and the membrane element or along the inside of the tail part of the membrane element and the gap between the inside of the, waste water along the water flow to the membrane element from the outside of the circumferential surface.

The film element as described above, the pure water end electrode is connected with the cathode of the power supply, the power supply electrode is connected with the inlet end of the positive electrode.

The film element as described above, in the membrane element each time after the completion of water, the water inlet end of the electrode end electrode with pure water the connected power supply polarity swap.

The film element as described above, the pure water end electrode and the inlet end of the electrode is energized during the operation of the film element, and/or the membrane element and the operation of the of water to the electrode is energized and for a predetermined time, and after a predetermined time the rear sewage.

The film element as described above, the pure water end of the power supply electrode is connected with the positive electrode, negative pole of the power electrode is connected with the inlet end of the, water operation of the membrane element and the electrode is energized and after a predetermined time, and after a predetermined time the rear sewage.

According to the 2nd aspect of the present invention, provides a water treatment device, said device comprises a membrane element as described above.

Technical effects

The invention is mainly in the existing film element on the basis of the, further improve its service life and the recovery rate of the membrane element, on the one hand, in the running process of the film element, the use of electrolysis of water, of reducing index LSI, thereby reducing the fouling tendency of the membrane element and, on the other hand, the film element in operation for a period of time when the flow rate, the membrane element stop cleaning on a regular basis, is formed on the external side of the component through the membrane of the acid solution, the membrane element is dissolved inorganic salt scaling; or through the membrane element is formed on the external side of the alkaline solution, organic fouling of the membrane element to dissolve. At the same time can pass through an inverted pole processing, so that the membrane element is formed on the external side of the aqueous solution of opposite polarity, the entire membrane element is soaked, so as to remove the diaphragm surface of the scaling inorganic or organic material, and then to restore the flow rate of the membrane element.

Description of drawings

Figure 1 is a schematic diagram of the prior art of the invention a wound membrane element, wherein the water inlet end of the water inlet opening direction of the water flow is not consistent flowing direction of the main body;

Figure 2 is a schematic diagram of the prior art of the present invention another kind of wound membrane element, wherein the opening direction of the water inlet end of the inlet water line flowing direction of the main body.

Figure 3 is a schematic diagram of wound membrane element of this invention.

Figure 4 is a schematic diagram of the arrangement manner of the wound membrane element of this invention the external electrode.

Figure 5 is the new programme of this invention is CN   104084048A and CN   104096483A the original proposal of the comparison between the current efficiency.

Figure 6 shows the wound membrane element of the present invention has higher performance consistency, wherein 1 #-4 # respectively representing the embodiment of the invention is adopted 1-4 method for preparing four membrane element, in the long-term continuous operation of the membrane element in the course of the performance, its retention characteristic during operation without any attenuation;

Figure 7 is a schematic diagram of CN inorganic salt scaling region of the membrane element   104084048A and CN   104096483A;

Figure 8 is a schematic diagram of deposition take place in the area of this invention.

In the above-mentioned Figure, (1) said diaphragm; said enters the water graticule mesh (2) ; (3) said cloth guide of pure water; said water collecting pipe (4) ; (5) said end electrode of pure water; the water inlet end of the said electrode (6) ; (7) said sealing adhesive and rubber ; (8) said water-proof in the least.

Mode of execution

In the present invention, stable quality index is LSI to index, which is the parameter of the scaling tendency to measure water quality. LSI > 0 time, the greater the value, the more easily scaling water; LSI < 0 time, the greater the absolute value, the easier it is to produce corrosion; LSI=0, no scale formation also no corrosion.

Alkalinity means can be in the water and the strong acid in the total amount of the substance, such substance comprises a strong alkali, weak base, such as weak acid salt of alkali.

Hardness means the concentration of the calcium and magnesium ions in the water.

Recovery rate = pure water flow/water inlet flow.

A prior art wound membrane element as shown in Figure 1 shown in the, water entering the membrane element along the arrow direction, after converging in the film element, along the and the water inlet direction (i.e. arrow direction) basic vertical direction (that is, the length direction of the film elements) flow. In this case, the inlet water flow is in the direction of the main body in the length direction of the element refers to the membrane , stabilizing enters the current of water water inlet water flow flowing direction of the main body the effective length of the on in fig. 1 in that C. At the same time, said B wire electrode or the electrode sheet (plate) the distance the distance between the outlet of pure water.

Another kind of the prior art wound membrane element as shown in Figure 2, along the arrow direction in which the water flow enters the membrane element, then element flows out the membrane along the arrow direction. In this case, the inlet water flow direction is refers to the membrane element of the main body in the width direction, the water inlet flow stabilizing enters the current of water flowing direction of the main body the effective length of the on in fig. 2 using C ' expressed. The inlet water flow is determined after the flowing direction of the main body, said A wire electrode or the electrode sheet (plate) is arranged at the water inlet flow area, on the flowing direction of the main body. B ' said wire electrode or the electrode sheet (plate) from the original water inlet end of the nearest distance.

membrane part of this invention as shown in Figure 3. Wherein the pure water terminal electrode 5 is arranged far away from the collecting pipe 4 pure water cloth guide 3 end, can be as shown in Figure 1 wherein the direction of flow of, the water close to the water-collecting pipe, flows out along the diaphragm; also can adopt the Figure 3 shows the direction of flow, that is, from the diaphragm away from the end of the water inlet, the water inlet along the flow channel direction, the two sides of the collecting pipe from the outlet.

Figure 4 is a schematic diagram of the arrangement manner of the wound membrane element of this invention the external electrode. As shown in Figure 4, the electrode (the water inlet end of the electrode) is wound on the outer periphery of the wound membrane element. Raw water from the water inlet side of the wound membrane element, wound membrane element in the map of the central water collecting pipe of the pure water is derived. Figure 7 is a schematic diagram of CN inorganic salt scaling region of the membrane element   104084048A and CN   104096483A. As shown in Figure 7, the inlet end of the the prior art enters the water graticule mesh electrode are arranged in the central part, because the part of the water, it is difficult to carry out cleaning of the membrane element, and the two end electrodes are arranged inside the film element, the long-period operation, on the film element the existence of substantial scale (scale is usually yellow, because the fig. 7 is a black-and-white picture, so gray stain part is a scale), these scale of a breakable ring membrane surface of the separation layer, the separation performance of the membrane so as to produce a certain amount of risk. But, if we want to remove these scale, disassembles the membrane element needs cleaning, the cleaning work is complicated. Figure 8 is a schematic diagram of deposition take place in the area of this invention. As shown in Figure 8, in the present invention in a membrane element, the scale formed on the periphery of the film element (scale is usually yellow, because the Figure 8 is a black-and-white picture, so gray stain part is a scale), is very easy to clean. Moreover, wound membrane element of this invention can be a reverse electrode processing, to exchange a positive electrode and a negative electrode, so that the membrane element is formed on the external side of the aqueous solution of opposite polarity, the entire membrane element is soaked, thus does not need to carry out manual cleaning, the surface of the diaphragm can be removed the organic matter and inorganic scale. Through this kind of method, the film element of this invention can be produced and acidic aqueous cleaning solution, used for removing the inorganic scale, can also produce the alkaline aqueous solution, a machine used for removing scale, can also be through a reverse electrode processing, an aqueous solution of opposite polarity is generated, removing inorganic and organic scale.

Embodiment

Embodiment 1

The lateral flow type 1810-75G-ss (change of the water inlet direction) reverse osmosis membrane element (basic structure as shown in Figure 1, but the electrode arrangement with the invention of Figure 3 the mode) the cloth guide is added in pure water of 12 cm × 16 cm of the conductive metal mesh as a pure water the end electrodes, membrane element winding 1m long iridium electrode the water inlet end of the titanium wire as, preparing novel control membrane scaling wound membrane element, the pure water end the wire electrode is connected to the cathode of the direct current power supply, the electrode wires and the inlet end of the is connected with the anode of the direct current power supply, after a period of time in operation, using the electrode to the membrane element, the membrane shell is produced in the acid dissolving film of inorganic salt scaling on the component. To improve the recovery rate of the film element 66%, continuous running, cumulative running 12h time, the cleaning thereof 30 min, its cumulative pure water flow reaches the 7t time, pure water flow rate of the membrane element to achieve an attenuation rate of 20%, of the electrode cleaning, the recovery rate of the membrane element 50%, pure water flow reaches the 7t time, pure water flow rate of the membrane element and the decay rate of 27%.

Embodiment 2

In 1810-75G common (not change of the water inlet direction) reverse osmosis membrane element (basic structure as shown in Figure 2, but the electrode arrangement with the invention of Figure 3 the mode) the cloth guide is added in pure water of 12 cm × 16 cm of the conductive metal mesh as a pure water the end electrodes, membrane element outer winding 70 cm long iridium electrode the water inlet end of the titanium wire as, preparing novel control membrane scaling wound membrane element, the pure water end the wire electrode is connected to the cathode of the direct current power supply, the electrode wires and the inlet end of the is connected with the anode of the direct current power supply, after a period of time in operation, using the electrode to the membrane element, the membrane shell is produced in the acid dissolving film of inorganic salt scaling on the component. To increase the recovery rate of the membrane element 50%, continuous running, cumulative running 12h time, the cleaning thereof 30 min, its cumulative pure water flow reaches the 8t time, pure water flow rate of the membrane element to achieve an attenuation rate of 20%, of the electrode cleaning, the recovery rate of the membrane element 30%, pure water flow reaches the 6t time, pure water flow rate of the membrane element and the decay rate of 23%.

Embodiment 3

The lateral flow type 3013-600-ss (change of the water inlet direction) reverse osmosis membrane element (basic structure and electrode arrangement as shown in Figure 3) of the cloth guide is added in pure water of 6 cm × 26 cm of the conductive metal mesh as a pure water end electrode, iridium in the film elements cranipolasty as the water inlet end of the electrode, to prepare the novel control membrane scaling wound membrane element, the pure water end the wire electrode is connected to the cathode of the direct current power supply, the electrode wires and the inlet end of the is connected with the anode of the direct current power supply, after a period of time in operation, using the electrode to the membrane element, the membrane shell is produced in the acid dissolving film of inorganic salt scaling on the component. To improve the recovery rate of the film element 66%, continuous running, cumulative running 8h time, the cleaning thereof 30 min, its cumulative pure water flow reaches the 12t time, pure water flow rate of the membrane element to achieve an attenuation rate of 15%, of the electrode cleaning, the recovery rate of the membrane element 50%, pure water flow reaches the 12t time, pure water flow rate of the membrane element and the decay rate of 25%.

Embodiment 4

The lateral flow type 3013-600-ss (change of the water inlet direction) reverse osmosis membrane element (basic structure and electrode arrangement as shown in Figure 3) of the cloth guide is added in pure water of 6 cm × 26 cm of the conductive metal mesh as a pure water end electrode, the outer winding of the membrane element 2m long iridium electrode the water inlet end of the titanium wire as, preparing novel control membrane scaling wound membrane element, the pure water end of the wire electrode is connected with the anode of the direct current power supply, the electrode wires and the inlet end of the direct current power supply is connected with the cathode, in the organic contamination for inlet water in the more serious carry out regular cleaning, after a period of time in operation, using the electrode to the membrane element, using membrane shell of alkali dissolving film generated in the organic matter pollution on the component. To improve the recovery rate of the film element 66%, continuous running, cumulative running 6h time, the cleaning thereof 30 min, its cumulative pure water flow reaches the 14t time, pure water flow rate of the membrane element and reach of the attenuation factors of 17%, of the electrode cleaning, the recovery rate of the membrane element 50%, pure water flow reaches the 14t time, pure water flow rate of the membrane element and the decay rate of 25%.

Embodiment 5

The lateral flow type 3013-600-ss (change of the water inlet direction) reverse osmosis membrane element (basic structure and electrode arrangement as shown in Figure 3) of the cloth guide is added in pure water of 6 cm × 26 cm of the conductive metal mesh as a pure water end electrode, the platinum coating layers on the surfaces of the membrane element cranipolasty as the inlet end of the electrode, to prepare the novel control membrane scaling wound membrane element, the pure water end the wire electrode is connected to the cathode of the direct current power supply, the electrode wires and the inlet end of the is connected with the anode of the direct current power supply, after a period of time in operation, the flow rate of the membrane element and the attenuation is reduced to 30% when, using the electrode to the membrane element, the membrane shell is produced in the acid dissolving film of inorganic scale pollution on the component. After four times, each time 30 min after cleaning of, the flow rate of the film elements have been restored, and the initial of the flow substantially similar to the membrane element.

Embodiment 6

The lateral flow type 3013-600G-ss (change of the water inlet direction) reverse osmosis membrane element (basic structure and electrode arrangement as shown in Figure 3) of the cloth guide is added in pure water of 12 cm × 16 cm of inert conductive metal mesh as a pure water the end electrodes, membrane element winding 1m long iridium electrode the water inlet end of the titanium wire as, preparation roll type film element, the pure water end the wire electrode is connected to the cathode of the direct current power supply, the electrode wires and the inlet end of the is connected with the anode of the direct current power supply, after a period of time in operation, using the electrode to the membrane element, the membrane shell is produced in the acid dissolving film of inorganic salt scaling on the component. After a period of time running, carries out reverse pole processing, the pure water end of the positive electrode is connected with the wire electrode, the water inlet end of the is connected with the cathode and the electrode wires and, by utilizing the membrane shell of alkali dissolving film produced in the inorganic salt scaling on the component. To improve the recovery rate of the film element 66%, continuous running, cumulative running 12h time, the cleaning thereof 30 min, its cumulative pure water flow reaches the 20t time, pure water flow rate of the membrane element to achieve an attenuation rate of 18%, of the electrode cleaning, the recovery rate of the membrane element 50%, pure water flow reaches the 17t time, pure water flow rate of the membrane element and the decay rate of 25%.

Embodiment 7

The CN   104084048A embodiment 1 membrane element of the roll rolling method, film element structure as shown in Figure 1. The patented method roll film forming element, the structure as shown in Figure 3. The two supporting respectively the membrane element and different solutions using the same test conditions, test the current situation of different voltage, in order to compare two rolling programme of the current efficiency. Figure 5 is the film element (diagram of embodiment 7 of the cube, the more the CN   104084048A embodiment 1 of mode of the rolling membrane element (Figure 5 in the original programme) with the embodiment of the invention 1 the rolling mode rolling 5 new programme of) the current efficiency, different voltage is compared with the magnitude of electric current. From Figure 5 can be obviously seen in, rolling programme employed by the Patent, required to achieve the same current of low voltage, it is within in a certain voltage range, the electric current of the new programme greater adjustability.

Embodiment 8

The above-mentioned embodiment the 1-6 preparing a total of 50 membrane element, to test their initial performance, the salt comprises a pure water flow and, the qualified rate is 100%. Four of these selected (respectively for the above embodiment 1-4 method for preparing) for long-term service life test, the main test the stability of the retention characteristic thereof. Figure 6 is to elect membrane element of the change of the salt rejection in long-term operation of the test, the test of the membrane element in the continuous mode of operation, this Patent is used for detecting rolling method to prepare membrane the reliability of the component. The experiment found that during the whole operation, the salt rejection of the film elements almost no attenuation, end-run to reach the membrane element life, its rejection has not been attenuated. That higher reliability of the film elements.