CN101545797A - Method for detecting compaction degree of screen in flat plate reverse osmosis or nano-filtration membrane equipment - Google Patents
Method for detecting compaction degree of screen in flat plate reverse osmosis or nano-filtration membrane equipment Download PDFInfo
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- CN101545797A CN101545797A CN200910050454A CN200910050454A CN101545797A CN 101545797 A CN101545797 A CN 101545797A CN 200910050454 A CN200910050454 A CN 200910050454A CN 200910050454 A CN200910050454 A CN 200910050454A CN 101545797 A CN101545797 A CN 101545797A
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Abstract
The invention relates to a method for detecting the compaction degree of a screen in a flat plate reverse osmosis or nano-filtration membrane equipment. The method comprises the following steps: assembling an entering water screen, a flat plate reverse osmosis or nano-filtration membrane sheet, and certain number of generated water screens or entering and generated water mixed screens; adopting tap water without active chlorine as entering water, and operating for certain period of time in a mode of complete cycle so that a reverse osmosis system is operated; after parameters of the generated water are stable, reducing the pressure of the system, closing a generated water valve, opening a resorption pipeline valve, and then turning off a high-pressure pump; and using the pressure difference between a measuring cylinder in a resorption pipeline and an inner membrane of flat plate equipment in the process of stopping the pump to detect the liquid level descending of the measuring cylinder so as to judge whether the screen in the flat plate membrane equipment is compacted tightly, wherein greater amplitude of the liquid level shows that the membrane screen is not compacted tightly, and no descending of the liquid level shows that the screen is compacted tightly.
Description
Technical field
What the present invention relates to is the method in a kind of detection technique field, specifically is the detection method of compaction degree of screen in a kind of flat plate reverse osmosis or the nano-filtration membrane equipment.
Background technology
The reverse osmosis membrane water technology has under the normal temperature outstanding advantages such as operation, energy consumption are low, compact equipment, operating cost economy, product water stabilization, become most economical seawater and technique of desalinating saline water, and be widely used in ultrapure water preparation, power plant's high-pressure boiler with concentrating and separating and purification process in water demineralizing purification, Industrial Wastewater Treatment, food and beverage processing and the various chemical field.Equally, NF membrane also has wide application in fields such as water treatment, pharmacy.
Flat sheet membrane equipment be a kind of simple in structure, equipment is small and exquisite, cheap, good seal performance, processing combination are easy, the small-size multifunction flat sheet membrane separation test device of convenient operation and control, and by changing different dull and stereotyped diaphragms, the continuous film separation test that can carry out corresponding micro-filtration, ultrafiltration, nanofiltration and counter-infiltration etc.But, by retrieval and test operation to the correlation technique document, if finding the filter of flat sheet membrane does not compress, can influence the turbulent flow peptizaiton of water inlet filter, cause the fluid flow distribution inhomogeneous, aggravation concentration polarization phenomenon, quicken generation (the Spiral wound modules andspacers:Review and analysis of film pollution on film and water inlet filter contact point, Joumal of Membrane Science 242 (2004) 129-135), the stability and the quality of water water quality produced in influence, reduce the salt rejection rate (Influence of spacer thickness onpermeate flux in spiral-wound seawater reverse osmosis systems, Desalination 146 (2002) 225-230) of film.In addition, since filter whether compress the accuracy that the consequence that is produced will influence film separation test result of study.
In flat sheet membrane equipment, do not retrieve how to detect pertinent literature and the patent whether filter compresses as yet at present.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, the detection method of compaction degree of screen in a kind of flat plate reverse osmosis or the nano-filtration membrane equipment is provided, resorption during by system's termination of pumping and the liquid level change situation in the resorption pipeline detect the degree that compresses of flat plate reverse osmosis or NF membrane filter simply, fast, effectively.
The present invention is achieved by the following technical solutions, specifically may further comprise the steps:
The first step is opened flat plate reverse osmosis or nano-filtration membrane equipment, and water inlet filter, flat plate reverse osmosis or nanofiltration diaphragm mixing filter are installed respectively, and whole film device is assembled;
In the first step, described water inlet filter, flat plate reverse osmosis or nanofiltration diaphragm mixing filter are meant: the product water of one deck water inlet filter, one deck flat plate reverse osmosis or nanofiltration diaphragm and 1-20 layer or product water and water inlet mix filter.
Second step, adopt through behind the activated carbon filtration not the tap water of chloride ion-containing as the water inlet of counter-infiltration or nanofiltration, start-up system, regulate bypass valve and dense penstock, all being back to concentrate and penetrating fluid into, the water bucket carries out circular flow, record water inlet electricity is led and is produced water power and leads, and calculates the salt rejection rate of film; Pass through formula:
In second step, after start-up system, be under 20-35 ℃ the condition, to regulate bypass valve and dense penstock at constant inflow temperature.
In second step, described adjusting bypass valve and dense penstock, pressure are that 10-40bar, flow are 30-100L/h.
Second the step in, described operate to the operation two hours after.
The 3rd step, reduce the pressure≤2bar of system, close the product penstock, open the resorption pipe valve, turn off high-pressure pump, be recorded in 20 seconds the liquid level decline situation of graduated cylinder in the resorption pipeline;
Liquid level descends many more, illustrates that the film filter does not compress more, and liquid level does not descend and shows that then filter is compacted.
Place the product water filter that some is installed in flat plate reverse osmosis and the nano-filtration membrane equipment, and certain and adopt under the identical operations pressure condition and move a period of time in inflow temperature and pH value, make that producing after the water parameter stability record produces water flux and produce water power and lead.Reduce the pressure of system then, close the product penstock, open the resorption pipe valve, termination of pumping subsequently, utilize the resorption in the termination of pumping process, the liquid level change situation of graduated cylinder (being higher than flat sheet membrane 20-50 centimetre) in the record resorption pipeline, thus can illustrate quantitatively whether filter compresses.
Compared with prior art, the present invention has following beneficial effect: the trace routine of employing is simple and convenient, can diagnose out apace whether filter compresses in flat board or the NF membrane device, provide reliable foundation for whether filter in the diagnosis small-size multifunction flat sheet membrane separation test device compresses.
Description of drawings
Fig. 1 is experimental provision structure of the present invention and experiment flow figure.
Fig. 2 is the resorption water yield situation of change among six embodiment of the present invention.
Fig. 3 is the salt rejection rate situation of change of reverse osmosis membrane among six embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is that prerequisite is implemented with the invention technical scheme, provided detailed embodiment and specific operation process, but protection scope of the present invention is not limited to following embodiment.
The first step is opened flat plate reverse osmosis or nano-filtration membrane equipment, and water inlet filter, flat plate reverse osmosis or nanofiltration diaphragm mixing filter are installed respectively, and whole film device is assembled;
In the first step, described water inlet filter, flat plate reverse osmosis or nanofiltration diaphragm mixing filter are meant: the product water of one deck water inlet filter, one deck flat plate reverse osmosis or nanofiltration diaphragm and 1-20 layer or product water and water inlet mix filter.
Second step, adopt through behind the activated carbon filtration not the tap water of chloride ion-containing as the water inlet of counter-infiltration or nanofiltration, start-up system, regulate bypass valve and dense penstock, all being back to concentrate and penetrating fluid into, the water bucket carries out circular flow, record water inlet electricity is led and is produced water power and leads, and calculates the salt rejection rate of film; Pass through formula:
In second step, after start-up system, be under 20-35 ℃ the condition, to regulate bypass valve and dense penstock at constant inflow temperature.
In second step, described adjusting bypass valve and dense penstock, pressure are that 10-40bar, flow are 30-100L/h.
Second the step in, described operate to the operation two hours after.
The 3rd step, reduce the pressure≤2bar of system, close the product penstock, open the resorption pipe valve, turn off high-pressure pump, be recorded in 20 seconds the liquid level decline situation of graduated cylinder in the resorption pipeline;
Liquid level descends many more, illustrates that the film filter does not compress more, and liquid level does not descend and shows that then filter is compacted.
As shown in Figure 1, in reverse osmosis membrane system, adopt low pressure flat plate reverse osmosis film, flat sheet membrane is taken from the TW30-1812 film that Beijing peace moral film separates company, and membrane area is 1.39 * 10
-2m
2, reverse osmosis membrane concentrate port is installed dense penstock, flow is taken into account heat interchanger, and the concentrate that comes out from reverse osmosis membrane all is back to former tank and circulates.The flowmeter of little range is installed and is produced penstock in the reverse osmosis membrane permeate port, and make whole penetrating fluids be back to former tank to circulate.Between former tank and the reverse osmosis membrane high-pressure pump is installed---membrane pump, bypass and bypass valve are installed behind membrane pump, be used to regulate the inlet flow rate and the pressure of reverse osmosis membrane.After the product penstock of penetrating fluid pipeline, connect the resorption pipeline, graduated cylinder (the water liquid level is higher than 22 centimetres of flat sheet membrane in the graduated cylinder) and resorption pipe valve are installed in the resorption pipeline by threeway.
Embodiment 1
At first, open the flat plate reverse osmosis film device, adopt one deck water inlet filter, one deck TW30-1812 flat plate reverse osmosis diaphragm and three layers of product water filter.Then that whole flat plate reverse osmosis film device assembling is intact.Subsequently, in former tank, inject the tap water of 20L through activated carbon filtration, regulate the cooling water flow in dense penstock, bypass valve and the heat interchanger in the reverse osmosis membrane system pipeline, making system is that 25 ℃, pressure are that 10bar, concentrated solution discharge are operation two hours under the condition of 50L/h in temperature, and record water inlet electricity is led k
FeedLead k with the product water power
Perm, the salt rejection rate that can draw reverse osmosis membrane this moment is 83.4%.Then, reduce the pressure≤2bar of system, close the product penstock, open the resorption pipe valve, turn off membrane pump, be recorded in 20 seconds the liquid level decline situation of graduated cylinder in the resorption pipeline, this moment, the resorption water yield was 23ml.The result as shown in Figures 2 and 3.
Present embodiment explanation, when the product water filter that adopts three layers, the liquid level of resorption pipeline descends very rapidly, and the filter of flat plate reverse osmosis film does not compress.
Embodiment 2
Present embodiment increase to produce water filter to five layer, and whole flat plate reverse osmosis film device assembling is intact.In former tank, inject the tap water of 20L through activated carbon filtration, regulate the cooling water flow in dense penstock, bypass valve and the heat interchanger in the reverse osmosis membrane system pipeline, making system is that 25 ℃, pressure are that 10bar, concentrated solution discharge are operation two hours under the condition of 50L/h in temperature, and record water inlet electricity is led k
FeedLead k with the product water power
Perm, this moment, the salt rejection rate of reverse osmosis membrane was 84.6%.Then, reduce the pressure≤2bar of system, close the product penstock, open the resorption pipe valve, turn off membrane pump, be recorded in 20 seconds the liquid level decline situation of graduated cylinder in the resorption pipeline, this moment, the resorption water yield was 17ml.The result as shown in Figures 2 and 3.
Present embodiment explanation, when the product water filter that adopts five layers, the salt rejection rate of reverse osmosis membrane increases when adopting three layers to produce the water filters, and the resorption water yield also decreases.But this moment, the filter of flat plate reverse osmosis film did not still compress.The liquid level of graduated cylinder descends still comparatively obvious.
Increase to produce water filter to seven layer in the present embodiment.In former tank, inject the tap water of 20L through activated carbon filtration, regulate the cooling water flow in dense penstock, bypass valve and the heat interchanger in the reverse osmosis membrane system pipeline, making system is that 25 ℃, pressure are that 10bar, concentrated solution discharge are operation two hours under the condition of 50L/h in temperature, and record water inlet electricity is led k
FeedLead k with the product water power
Perm, this moment, the salt rejection rate of reverse osmosis membrane was 88.3%.Then, reduce the pressure≤2bar of system, close the product penstock, open the resorption pipe valve, turn off membrane pump, be recorded in 20 seconds the liquid level decline situation of graduated cylinder in the resorption pipeline, this moment, the resorption water yield was 12ml.The result as shown in Figures 2 and 3.
Present embodiment explanation, when producing the water filter and be seven layers, the salt rejection rate of reverse osmosis membrane all increases when the water filter is three layers and five layers than producing, and the also obviously reduction of the resorption water yield.
Embodiment 4
Present embodiment increase to produce water filter to nine layer.In former tank, inject the tap water of 20L through activated carbon filtration, regulate the cooling water flow in dense penstock, bypass valve and the heat interchanger in the reverse osmosis membrane system pipeline, making system is that 25 ℃, pressure are that 10bar, concentrated solution discharge are operation two hours under the condition of 50L/h in temperature, and record water inlet electricity is led k
FeedLead k with the product water power
Perm, this moment, the salt rejection rate of reverse osmosis membrane was 90.5%.Then, reduce the pressure≤2bar of system, close the product penstock, open the resorption pipe valve, turn off membrane pump, be recorded in 20 seconds the liquid level decline situation of graduated cylinder in the resorption pipeline, this moment, the resorption water yield was 6ml.The result as shown in Figures 2 and 3.
Present embodiment explanation, when the product water filter that adopts nine layers, the product water water quality of reverse osmosis membrane obviously improves, and the resorption water yield is seldom, and compaction degree of screen increases.
Embodiment 5
Present embodiment increases product water filter to eleventh floor, and whole flat plate reverse osmosis film device assembling is intact.In former tank, inject the tap water of 20L through activated carbon filtration, regulate the cooling water flow in dense penstock, bypass valve and the heat interchanger in the reverse osmosis membrane system pipeline, making system is that 25 ℃, pressure are that 10bar, concentrated solution discharge are operation two hours under the condition of 50L/h in temperature, and record water inlet electricity is led k
FeedLead k with the product water power
Perm, this moment, the salt rejection rate of reverse osmosis membrane was 92%.Then, reduce the pressure≤2bar of system, close the product penstock, open the resorption pipe valve, turn off membrane pump, be recorded in 20 seconds the liquid level decline situation of graduated cylinder in the resorption pipeline, this moment, the resorption water yield was 3ml.The result as shown in Figures 2 and 3.
The present embodiment explanation, when adopting the product water filter of eleventh floor, the salt rejection rate of reverse osmosis membrane can reach 92%, and the resorption water yield is further seldom, and compaction degree of screen further increases.
In order to reduce the resistance that produces water, the filter that the present embodiment film produces the water side adopts eleventh floor mixing filter to carry out: four layers of water inlet filter add that seven layers are produced the water filter.Whole flat plate reverse osmosis film device assembling is intact.In former tank, inject the tap water of 20L through activated carbon filtration, regulate the cooling water flow in dense penstock, bypass valve and the heat interchanger in the reverse osmosis membrane system pipeline, making system is that 25 ℃, pressure are that 10bar, concentrated solution discharge are operation two hours under the condition of 50L/h in temperature, and record water inlet electricity is led k
FeedLead k with the product water power
Perm, this moment, the salt rejection rate of reverse osmosis membrane was 92.3%.Then, reduce the pressure≤2bar of system, close the product penstock, open the resorption pipe valve, turn off membrane pump, the liquid level of graduated cylinder does not descend in the resorption pipeline in 20 seconds.The result as shown in Figures 2 and 3.
The present embodiment explanation is adopted when mixing filter (four layers of water inlet filter add that seven layers are produced the water filter), and the filter of flat plate reverse osmosis film can compress, and the liquid level of graduated cylinder does not descend in the resorption pipeline.Water production rate was 10ml/min when the water side of producing film adopted eleventh floor mixings filter, and water production rate is 9.4ml/min when adopting simple eleventh floor to produce the water filter, illustrate that the employing that mixes filter has reduced the mobile resistance of product water.
Claims (5)
1, the detection method of compaction degree of screen in a kind of flat plate reverse osmosis or the nano-filtration membrane equipment is characterized in that, may further comprise the steps:
The first step is opened flat plate reverse osmosis or nano-filtration membrane equipment, and water inlet filter, flat plate reverse osmosis or nanofiltration diaphragm mixing filter are installed respectively, and whole film device is assembled;
Second step, adopt through behind the activated carbon filtration not the tap water of chloride ion-containing as the water inlet of counter-infiltration or nanofiltration, start-up system, regulate bypass valve and dense penstock, all being back to concentrate and penetrating fluid into, the water bucket carries out circular flow, record water inlet electricity is led and is produced water power and leads, and calculates the salt rejection rate of film;
The 3rd step, reduce the pressure≤2bar of system, close the product penstock, open the resorption pipe valve, turn off high-pressure pump, be recorded in 20 seconds the liquid level decline situation of graduated cylinder in the resorption pipeline;
Liquid level descends many more, illustrates that the film filter does not compress more, and liquid level does not descend and shows that then filter is compacted.
2, the detection method of compaction degree of screen in flat plate reverse osmosis according to claim 1 or the nano-filtration membrane equipment, it is characterized in that, in the first step, described water inlet filter, flat plate reverse osmosis or nanofiltration diaphragm mixing filter are meant: the product water of one deck water inlet filter, one deck flat plate reverse osmosis or nanofiltration diaphragm and 1-20 layer or product water and water inlet mix filter.
3, the detection method of compaction degree of screen in flat plate reverse osmosis according to claim 1 or the nano-filtration membrane equipment is characterized in that, in second step, after start-up system, is under 20-35 ℃ the condition, to regulate bypass valve and dense penstock at constant inflow temperature.
4, the detection method of compaction degree of screen in flat plate reverse osmosis according to claim 1 or the nano-filtration membrane equipment is characterized in that, in second step, described adjusting bypass valve and dense penstock, pressure are that 10-40bar, flow are 30-100L/h.
5, the detection method of compaction degree of screen in flat plate reverse osmosis according to claim 1 or the nano-filtration membrane equipment is characterized in that, in second step, and described operating to after the operation two hours.
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| CN102153169A (en) * | 2010-12-24 | 2011-08-17 | 上海交通大学 | Method for controlling soluble microbial product organic pollutants on reverse osmosis membrane |
| CN104399374A (en) * | 2014-11-25 | 2015-03-11 | 贵阳时代沃顿科技有限公司 | Method and device for detecting integrity of composite reverse osmosis membrane desalting layer |
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| CN102153169B (en) * | 2010-12-24 | 2012-12-12 | 上海交通大学 | Method for controlling soluble microbial product organic pollutants on reverse osmosis membrane |
| CN102153169A (en) * | 2010-12-24 | 2011-08-17 | 上海交通大学 | Method for controlling soluble microbial product organic pollutants on reverse osmosis membrane |
| CN105439300A (en) * | 2014-08-21 | 2016-03-30 | 珠海格力电器股份有限公司 | Reverse osmosis water purifier |
| CN104399374A (en) * | 2014-11-25 | 2015-03-11 | 贵阳时代沃顿科技有限公司 | Method and device for detecting integrity of composite reverse osmosis membrane desalting layer |
| CN104399374B (en) * | 2014-11-25 | 2016-08-17 | 贵阳时代沃顿科技有限公司 | A kind of method detecting complex reverse osmosis membrane desalination layer integrity and detection device thereof |
| US10589229B2 (en) | 2015-08-03 | 2020-03-17 | Foshan Midea Chungho Water Purification Equipment Co., Ltd. | Central tube component of filter element and manufacturing method thereof |
| CN105129916A (en) * | 2015-08-03 | 2015-12-09 | 佛山市美的清湖净水设备有限公司 | Central pipe component of filter element and preparation method thereof |
| CN105347439A (en) * | 2015-10-27 | 2016-02-24 | 杨思博 | Water saving-type reverse osmosis purifier |
| CN105692875A (en) * | 2016-03-16 | 2016-06-22 | 东北农业大学 | Membrane pollution vibration control device used in process of treating algae containing water through low-pressure spiral membrane and method for controlling membrane pollution through device |
| CN105692875B (en) * | 2016-03-16 | 2018-05-18 | 东北农业大学 | A kind of fouling membrane vibration control apparatus during rolling low pressure film process algae-containing water and the method using device control fouling membrane |
| CN106186434B (en) * | 2016-08-22 | 2019-05-10 | 山东辰宇稀有材料科技有限公司 | A kind of automatic monitoring sewage disposal system |
| CN106186434A (en) * | 2016-08-22 | 2016-12-07 | 山东辰宇稀有材料科技有限公司 | One monitors sewage disposal system automatically |
| CN107308697A (en) * | 2017-08-21 | 2017-11-03 | 金科水务工程(北京)有限公司 | Liquid purifier is tested in a kind of counter-infiltration |
| CN107308697B (en) * | 2017-08-21 | 2023-05-30 | 金科环境股份有限公司 | Reverse osmosis test liquid purifier |
| CN115432839A (en) * | 2022-07-29 | 2022-12-06 | 广汽乘用车有限公司 | Surface coating waste solvent treatment device and process |
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