CN112619431A - Equipment for monitoring membrane surface pollution behavior in high-salinity wastewater treatment in real time - Google Patents
Equipment for monitoring membrane surface pollution behavior in high-salinity wastewater treatment in real time Download PDFInfo
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Abstract
An equipment for monitoring the membrane surface pollution behavior in high-salinity wastewater treatment in real time is composed of an ultrafiltration pretreatment system, a cross-flow nanofiltration parallel system, a real-time monitoring membrane surface pollution behavior system and a real-time data acquisition system; the cross-flow nanofiltration parallel system is formed by combining a first cross-flow nanofiltration subsystem, a second cross-flow nanofiltration subsystem and a water delivery subsystem which are connected in parallel; the real-time monitoring system for the membrane surface pollution behavior consists of a first optical coherence tomography scanner, a second optical coherence tomography scanner, a first membrane flux real-time monitoring device and a second membrane flux real-time monitoring device; the real-time data acquisition system is a computer provided with data acquisition and processing software. The device is used for monitoring the membrane surface pollution layer in the coal chemical industry high-salt wastewater treatment process by optical coherence tomography for the first time, can accurately acquire the information of the membrane surface pollution condition in real time, can simultaneously use membranes made of two different materials and structures, and provides data support for the screening of the membranes.
Description
Technical Field
The invention belongs to the field of monitoring of membrane surface pollution behaviors in a high-salinity wastewater treatment process, and relates to equipment for monitoring membrane surface pollution behaviors in the high-salinity wastewater treatment process in real time.
Background
The energy structure of China enables the coal chemical industry to be rapidly developed, but the problem is that a large amount of high-salt wastewater mainly containing sodium sulfate and sodium chloride is generated, and meanwhile, part of organic matters which are difficult to degrade are accompanied in the high-salt wastewater, so that if the high-salt wastewater is directly discharged, not only is the resource waste caused, but also the environment is seriously polluted. With the enhancement of environmental protection and the deepening of sustainable development concept, the treatment requirement of high-salinity wastewater becomes stricter.
The wide application of the membrane treatment technology in wastewater treatment provides a reliable technology for realizing high-quality recycling of industrial wastewater, and plays an extremely important role in the treatment process of the saline wastewater in the coal chemical industry. The nanofiltration and reverse osmosis membrane treatment technology has wide application prospect in the field of water treatment as an advanced treatment technology and is widely applied to wastewater treatment. However, the reduction of water flux, the increase of energy consumption for operation, the shortening of the service life of the membrane, the deterioration of economic benefit and the deterioration of the quality of the effluent water caused by the membrane pollution problem are important factors for limiting the development of the membrane. Therefore, in the water treatment process, it is very necessary to accurately judge the change of the membrane performance over time in the nanofiltration and reverse osmosis processes and estimate the membrane recovery time.
The equipment (or device) for monitoring the membrane surface pollution behavior in the existing high-salinity wastewater treatment process is provided with a nanofiltration system or a reverse osmosis system, the monitoring system usually consists of a pressure gauge or/and a conductivity detector, the membrane desalination performance and the membrane surface pollution condition are mainly judged according to transmembrane pressure difference or/and conductivity and other data, and the transmembrane pressure difference and the conductivity belong to macroscopic data and are relatively slow in feedback, so that the following problems exist: 1. the information of the pollution condition of the membrane surface cannot be accurately acquired in real time, so that the change of the membrane performance along with the time lapse in the nanofiltration and reverse osmosis processes is difficult to accurately judge and the membrane recovery time is accurately estimated; 2. two membranes with different materials and structures cannot be used simultaneously, so that the monitoring result has contrast, and data support is provided for the screening of the membranes; 3. accurate and effective information can not be provided for the screening and the use of the scale inhibitor and the scale remover in the membrane cleaning process through the real-time membrane pollution condition.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide equipment for monitoring the membrane surface pollution behavior in high-salinity wastewater treatment in real time, so that the information of the membrane surface pollution condition can be accurately acquired in real time, two membranes made of different materials and having different structures can be used simultaneously, data support is provided for the screening of the membranes, and more accurate and effective information is provided for the screening and the use of scale inhibitors in the membrane pollution process and scale inhibitors in the membrane cleaning process.
The equipment for monitoring the membrane surface pollution behavior in the high-salinity wastewater treatment in real time is formed by combining an ultrafiltration pretreatment system, a cross-flow nanofiltration parallel system, a real-time membrane surface pollution behavior monitoring system and a real-time data acquisition system; the cross-flow nanofiltration parallel system is formed by combining a first cross-flow nanofiltration subsystem, a second cross-flow nanofiltration subsystem and a water delivery subsystem, wherein the first cross-flow nanofiltration subsystem and the second cross-flow nanofiltration subsystem are connected in parallel, and the water delivery subsystem is used for conveying pretreated wastewater for the two sets of cross-flow nanofiltration subsystems; the real-time monitoring membrane surface pollution behavior system consists of a first optical coherence tomography scanner, a second optical coherence tomography scanner, a first membrane flux real-time monitoring device and a second membrane flux real-time monitoring device; the real-time data acquisition system is a computer provided with data acquisition and processing software;
the ultrafiltration pretreatment system is connected with a water delivery subsystem in the cross-flow nanofiltration parallel system through a pipe fitting, and the pretreated wastewater is delivered to the water delivery subsystem; the observation head of the first optical coherence tomography scanner is combined with a first observation window arranged on the first cross-flow nanofiltration device, and the observation head of the second optical coherence tomography scanner is combined with a second observation window arranged on the second cross-flow nanofiltration device; the first membrane flux real-time monitoring device is connected with a water production outlet of the first cross-flow nanofiltration device through a pipe fitting, and the second membrane flux real-time monitoring device is connected with a water production outlet of the second cross-flow nanofiltration device through a pipe fitting; the computer is respectively connected with the first optical coherence tomography scanner, the second optical coherence tomography scanner, the first membrane flux real-time monitoring device and the second membrane flux real-time monitoring device through data lines, receives information of the surface pollution condition of the nanofiltration membrane in the first cross-flow nanofiltration device and the second cross-flow nanofiltration device from the first optical coherence tomography scanner, the second optical coherence tomography scanner, the first membrane flux real-time monitoring device and the second membrane flux real-time monitoring device, and processes and stores the information.
In the above apparatus for monitoring membrane surface contamination behavior in high salinity wastewater treatment, the water delivery subsystem in the cross-flow nanofiltration parallel system is composed of a second water delivery pump, a heat exchanger, a jacket water bath water storage tank, a third water delivery pump, a high-pressure pump and a flow control valve, the second water delivery pump, the water storage tank of the jacket water bath water storage tank, the third water delivery pump and the high-pressure pump are sequentially connected through pipes, the heat exchanger is connected with the jacket of the jacket water bath water storage tank through a pipe, a liquid inlet of the flow control valve is connected with a liquid outlet of the high-pressure pump through a pipe, and a liquid outlet of the flow control valve is connected with the water storage tank of the jacket water bath water storage tank through a pipe; the first cross-flow nanofiltration subsystem is formed by sequentially connecting a first pressure gauge, a first liquid inlet valve, a first cross-flow nanofiltration device, a second pressure gauge, a first back pressure regulator and a first flow meter through pipe fittings, and the second cross-flow nanofiltration subsystem is formed by sequentially connecting a third pressure gauge, a second liquid inlet valve, a second cross-flow nanofiltration device, a fourth pressure gauge, a second back pressure regulator and a second flow meter through pipe fittings.
In the equipment for monitoring the membrane surface pollution behavior in the high-salinity wastewater treatment in real time, the ultrafiltration pretreatment system is formed by sequentially connecting an adjusting tank, a first water delivery pump, a filter, an ultrafiltration device and a produced water storage tank through pipes, wherein a first emptying valve is arranged at the lower part of the adjusting tank, and a second emptying valve is arranged at the lower part of the produced water storage tank; and the produced water storage pool is connected with a liquid inlet of a second water delivery pump in the water delivery subsystem through a pipe fitting.
In the above apparatus for monitoring the membrane surface contamination behavior in the high-salinity wastewater treatment in real time, the concentrated water output by the first cross-flow nanofiltration device and the second cross-flow nanofiltration device can be separately collected, or can be sent to the regulating reservoir in the ultrafiltration pretreatment system. When the selected technical scheme is that concentrated water output by the first cross-flow nanofiltration device and the second cross-flow nanofiltration device is sent to an adjusting tank in the ultrafiltration pretreatment system, a concentrated water outlet of the first cross-flow nanofiltration device in the first cross-flow nanofiltration subsystem and a concentrated water outlet of the second cross-flow nanofiltration device in the second cross-flow nanofiltration subsystem are respectively connected with the adjusting tank in the ultrafiltration pretreatment system through pipe fittings.
In the above apparatus for monitoring the membrane surface contamination behavior in the high-salinity wastewater treatment in real time, the first membrane flux real-time monitoring device and the second membrane flux real-time monitoring device in the system for monitoring the membrane surface contamination behavior in real time are both composed of an electronic balance and a water container placed on the electronic balance, and the electronic balance is connected with the computer through a data line.
The equipment for monitoring the membrane surface pollution behavior in the high-salinity wastewater treatment in real time disclosed by the invention is used and operated as follows:
1. conveying the high-salinity wastewater in the coal chemical industry into an adjusting tank in an ultrafiltration pretreatment system, adjusting the wastewater in the adjusting tank, sequentially entering a filter and an ultrafiltration device through a first water conveying pump and a pipeline, and allowing the ultrafiltration product water treated by the ultrafiltration device to enter a product water storage tank (capable of being adjusted again) through a pipeline;
2. a second water delivery pump in a water delivery subsystem of the cross-flow nanofiltration parallel system injects wastewater subjected to ultrafiltration pretreatment in a water production storage tank into a water storage tank of a jacket water bath water storage tank, the temperature of feed water is controlled by a heat exchanger in a circulating manner, the wastewater in the water storage tank of the jacket water bath water storage tank is respectively input into a first cross-flow nanofiltration device and a second cross-flow nanofiltration device in a first cross-flow nanofiltration subsystem and a second cross-flow nanofiltration subsystem through pipelines by a third water delivery pump and a high-pressure pump in sequence to be treated (or subjected to membrane pollution experiments), the liquid inlet amount is controlled by a flow control valve in the water delivery subsystem during treatment (or experiments), the real-time flow is displayed by flow meters in the first cross-flow nanofiltration subsystem and the second cross-flow nanofiltration subsystem, the control pressure is jointly adjusted by a feed water pressure and a back pressure regulator and a liquid inlet valve in the first cross-flow nanofiltration subsystem and the second cross-flow nanofiltration subsystem, and the control pressure is jointly adjusted by a back pressure regulator and a liquid inlet valve in the first cross-flow nanofiltration subsystem and the The force meter displays real-time pressure;
3. in the wastewater (or experiment) treatment process of the first cross-flow nanofiltration device and the second cross-flow nanofiltration device, a dynamic growth process of a real-time in-situ scanning nanofiltration membrane surface pollution layer is carried out by a first optical coherence tomography scanner and a second optical coherence tomography scanner in a real-time monitoring membrane surface pollution behavior system, vertical 2D images with certain pixels in the x direction and the z direction are obtained from the first cross-flow nanofiltration device and the second cross-flow nanofiltration device at intervals of fixed time, and the obtained images are converted into electric signals and are transmitted to a computer through a data line; a first membrane flux real-time monitoring device and a second membrane flux real-time monitoring device in a system for monitoring the membrane surface pollution behavior in real time acquire the membrane water production quality of the first cross-flow nanofiltration device and the second cross-flow nanofiltration device in real time and feed back to a computer through a data line;
4. and processing the received information by a computer forming the real-time data acquisition system to obtain data of the change of the thickness of the membrane fouling layer along with time and data of the change of the membrane flux along with time.
5. In the process of treating wastewater (or experiments) by the first cross-flow nanofiltration device and the second cross-flow nanofiltration device, the output concentrated water is conveyed to an adjusting tank in an ultrafiltration pretreatment system through a pipeline for treatment or is collected by a container, and nanofiltration water is collected by the first membrane flux real-time monitoring device and the second membrane flux real-time monitoring device and then is used for analysis and detection.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the equipment, the optical coherence tomography scanner and the membrane flux real-time monitoring device are used for constructing the real-time monitoring membrane surface pollution behavior system, the optical coherence tomography scanner is used for monitoring the membrane surface pollution layer in the coal chemical industry high-salt wastewater treatment process for the first time, so that the dynamic growth process of the membrane surface pollution layer is monitored in situ in real time for the first time, the data of the thickness of the membrane pollution layer changing along with the treatment time are obtained, the data of the membrane flux changing along with the treatment time obtained by the membrane flux real-time monitoring device are combined, the change of the membrane performance along with the time lapse in the nanofiltration process can be accurately judged, the membrane recovery time can be accurately estimated, the scale inhibitor and the scale remover with the best effects are screened out, and the guarantee is provided for the effective treatment of wastewater.
(2) Because the two sets of cross-flow nanofiltration subsystems are arranged in the cross-flow nanofiltration parallel system of the equipment, the cross-flow nanofiltration devices in the two sets of cross-flow nanofiltration subsystems can use nanofiltration membranes with different materials and structures during wastewater treatment, and provide data support for membrane screening through the acquired data of the thickness of the membrane fouling layer changing along with the treatment time and the data of the membrane flux changing along with the treatment time.
(3) Because the equipment is provided with the ultrafiltration pretreatment system, the equipment not only can be used for monitoring the membrane surface pollution behavior during the actual treatment of the high-salinity wastewater, but also can use the actual coal chemical industry high-salinity wastewater as the inlet water of the membrane pollution experiment in scientific research, so that the research result is more suitable for the actual wastewater treatment working condition
(4) The device provided by the invention is simple to operate, can be used for monitoring the surface pollution behaviors of the high-salinity wastewater treatment membrane and other wastewater treatment membrane, and has a wide application prospect.
Drawings
FIG. 1 is a schematic structural diagram of the apparatus for real-time monitoring of membrane surface contamination behavior in high salinity wastewater treatment according to the present invention, in which 1-an adjusting tank, 2-a first vent valve, 3-a first water transfer pump, 4-a filter, 5-an ultrafiltration device, 6-a produced water storage tank, 7-a second vent valve, 8-a second water transfer pump, 9-a heat exchanger, 10-a jacket water bath water storage tank, 11-a third water transfer pump, 12-a high pressure pump, 13-a flow control valve, 14-a first pressure gauge, 15-a first liquid inlet valve, 16-a first cross-flow nanofiltration device, 17-a first observation window, 18-a first optical coherence tomography, 19-a second pressure gauge, 20-a first back pressure regulator, 21-a first flow meter, 22-a first membrane flux real-time monitoring device, 23-a third pressure gauge, 24-a second liquid inlet valve, 25-a second cross-flow nanofiltration device, 26-a second observation window, 27-a second optical coherence tomography scanner, 28-a fourth pressure gauge, 29-a second back pressure regulator, 30-a second flowmeter, 31-a second membrane flux real-time monitoring device, 32-a computer.
FIG. 2 is a graph of membrane flux as a function of treatment time during high salinity wastewater treatment after normalization.
FIG. 3 is a graph showing the thickness of a fouling layer on the surface of a membrane with the time of treatment in the treatment process of high-salinity wastewater.
Detailed Description
The following provides a further description of the apparatus for real-time monitoring membrane surface fouling behavior in high-salinity wastewater treatment and its use by way of examples and with reference to the accompanying drawings.
Example 1
In this embodiment, an apparatus for monitoring a membrane surface contamination behavior in a high salinity wastewater treatment in real time is shown in fig. 1, and includes an ultrafiltration pretreatment system, a cross-flow nanofiltration parallel system, a system for monitoring a membrane surface contamination behavior in real time, and a real-time data acquisition system.
The ultrafiltration pretreatment system is formed by sequentially connecting an adjusting tank 1, a first water delivery pump 3, a filter 4, an ultrafiltration device 5 and a produced water storage tank 6 through pipe fittings, wherein a first emptying valve 2 is arranged on the lower part of the adjusting tank 1 and used for emptying high-salinity wastewater in the adjusting tank, and a second emptying valve 7 is arranged on the lower part of the produced water storage tank 6 and used for emptying the pretreated high-salinity wastewater in the produced water storage tank.
The cross-flow nanofiltration parallel system consists of a first cross-flow nanofiltration subsystem, a second cross-flow nanofiltration subsystem and a water delivery subsystem, wherein the first cross-flow nanofiltration subsystem and the second cross-flow nanofiltration subsystem are connected in parallel, and the water delivery subsystem is used for delivering the pretreated high-salinity wastewater to the two sets of cross-flow nanofiltration subsystems; the water delivery subsystem consists of a second water delivery pump 8, a heat exchanger 9, a jacket water bath water storage tank 10, a third water delivery pump 11, a high-pressure pump 12 and a flow control valve 13, wherein the second water delivery pump 8, the water storage tank of the jacket water bath water storage tank 10, the third water delivery pump 11 and the high-pressure pump 12 are sequentially connected through pipe fittings, the heat exchanger 9 is connected with the jacket of the jacket water bath water storage tank 10 through a pipe fitting, a liquid inlet of the flow control valve 13 is connected with a liquid outlet of the high-pressure pump 12 through a pipe fitting, and a liquid outlet of the flow control valve 13 is connected with a water storage tank of the jacket water bath water storage tank (10) through; the first cross-flow nanofiltration subsystem is formed by sequentially connecting a first pressure gauge 14, a first liquid inlet valve 15, a first cross-flow nanofiltration device 16, a second pressure gauge 19, a first back pressure regulator 20 and a first flowmeter 21 through pipe fittings; the second cross-flow nanofiltration subsystem is formed by sequentially connecting a third pressure gauge 23, a second liquid inlet valve 24, a second cross-flow nanofiltration device 25, a fourth pressure gauge 28, a second back pressure regulator 29 and a second flow meter 30 through pipe fittings.
The real-time monitoring membrane surface pollution behavior system consists of a first optical coherence tomography scanner 18, a second optical coherence tomography scanner 27, a first membrane flux real-time monitoring device 22 and a second membrane flux real-time monitoring device 31; the first membrane flux real-time monitoring device 22 and the second membrane flux real-time monitoring device 31 are both composed of an electronic balance and a water container placed on the electronic balance.
The real-time data acquisition system is a computer 32 provided with data acquisition and processing software, the data acquisition and processing software comprises OHAUS data acquisition software and ImageJ image processing software, wherein the OHAUS data acquisition software is provided by a membrane flux real-time monitoring device manufacturer US OHAUS in a matching way, and the ImageJ image processing software is free software from open sources.
The system is used for monitoring the membrane surface pollution behavior in the high-salinity wastewater treatment in real time through the combination of related components or devices in the system, and the specific combination is as follows:
a produced water storage tank 6 in the ultrafiltration pretreatment system is connected with a liquid inlet of a second water delivery pump 8 of a water delivery subsystem in the cross-flow nanofiltration parallel system through a pipe fitting; a concentrated water outlet of a first cross-flow nanofiltration device 16 of a first cross-flow nanofiltration subsystem and a concentrated water outlet of a second cross-flow nanofiltration device 25 of a second cross-flow nanofiltration subsystem in the cross-flow nanofiltration parallel system are respectively connected with an adjusting tank 1 in an ultrafiltration pretreatment system through pipe fittings; an observation head of a first optical coherence tomography scanner 18 in the real-time monitoring membrane surface pollution behavior system is combined with a first observation window 17 arranged on a first cross-flow nanofiltration device 16, and an observation head of a second optical coherence tomography scanner 27 is combined with a second observation window 26 arranged on a second cross-flow nanofiltration device 25; a first membrane flux real-time monitoring device 22 in the real-time monitoring membrane surface pollution behavior system is connected with a water production outlet of a first cross-flow nanofiltration device 16 through a pipe fitting, and a second membrane flux real-time monitoring device 31 is connected with a water production outlet of a second cross-flow nanofiltration device 25 through a pipe fitting; the computer 32 is respectively connected with the first optical coherence tomography scanner 18, the second optical coherence tomography scanner 27, the first membrane flux real-time monitoring device 22 and the second membrane flux real-time monitoring device 31 through data lines.
The water delivery pump, the filter, the ultrafiltration device, the heat exchanger, the high-pressure pump, the flow control valve, the liquid inlet valve, the air release valve, the pressure gauge, the flowmeter, the back pressure regulator, the cross-flow nanofiltration device, the optical coherence tomography scanner, the membrane flux real-time monitoring device and the computer which are related in the embodiment are purchased from the market. Wherein, the size of the filter 4 is 10 inches; the size of the ultrafiltration device 5 is 5 inches; the high pressure pump 12 is of the type Hydra-cell, with a pressure range of 0-6.9 MPa; the cross-flow nanofiltration device comprises: the nanofiltration membrane pool CF042SS has the dimensions of 220mm multiplied by 110mm multiplied by 60mm, the channel dimension of 130mm multiplied by 50mm multiplied by 2mm, the observation window dimension: 4.3cm multiplied by 4.3cm, and the pressure bearing range is 0-6.9 Mpa; optical coherence tomography: lumedica, model oqlabscope2.0, usa; the membrane flux real-time monitoring device comprises: OHAUS, usa, model STX6201 ZH; the computer is a PC.
Example 2
In this example, the apparatus described in example 1 was used to perform an experiment for monitoring the membrane surface fouling behavior in real time during the treatment of high salinity wastewater. The composition of the high salinity wastewater is shown in table 1.
TABLE 1 composition of high-salinity wastewater
In the apparatus for monitoring the membrane surface contamination behavior in the high-salt wastewater treatment in real time used in this embodiment, the nanofiltration membranes of the first cross-flow nanofiltration device 16 and the second cross-flow nanofiltration device 25 are both nanofiltration 270 (dow), the feeding temperature of the membrane contamination experiment is 25 ± 1 ℃, the operating pressure is 2.0 ± 0.02MPa, and the feeding flow is 0.35L/min, and the operation is as follows:
1. before the membrane pollution experiment is started, the nanofiltration membrane is subjected to membrane compaction treatment for 24 hours by using deionized water under the pressure of 2.0 +/-0.02 MPa.
2. Closing a first emptying valve 2 arranged at the lower part of an adjusting tank 1 and a second emptying valve 7 arranged at the lower part of a produced water storage tank 6 in an ultrafiltration pretreatment system, pouring the high-salinity wastewater in the coal chemical industry into the adjusting tank 1, adjusting the high-salinity wastewater by a flocculating agent polyacrylamide and a biocide sip, removing suspended particles, microorganisms and the like in the wastewater, and adjusting the pH value of the wastewater to be about 7.0 by sodium hydroxide or hydrochloric acid; then, a first water delivery pump 3 is started, the high-salinity wastewater is pretreated by a filter 4 and an ultrafiltration device 5 in sequence through a pipeline, ultrafiltration produced water is injected into a produced water storage pool 6 through a pipeline, and more than 90% of colloidal particles, bacteria, macromolecular organic matters and the like in the high-salinity wastewater can be intercepted by a pretreatment working section.
3. Starting a second water delivery pump 8 of a water delivery subsystem in the cross-flow nanofiltration parallel system to inject ultrafiltration water into a water storage tank of a jacket water bath water storage tank 10 through a pipeline, and controlling the temperature of the ultrafiltration water in the water storage tank to be 25 +/-1 ℃ through a heat exchanger 9; and sequentially opening a third water delivery pump 11 and a high-pressure pump 12 to deliver ultrafiltration product water with the temperature of 25 +/-1 ℃ to a first cross-flow nanofiltration device 16 in the first cross-flow nanofiltration subsystem and a second cross-flow nanofiltration device 25 in the second cross-flow nanofiltration subsystem through pipelines for membrane pollution experiments, controlling the feed flow to be 0.35L/min through a flow control valve 13 in the experiment process, displaying the real-time flow through a first flow meter 21 and a second flow meter 30, adjusting and controlling the feed pressure to be 2.0 +/-0.02 MPa through the feed water pressure, a first backpressure regulator 20, a second backpressure regulating valve 29, a first liquid inlet valve 15 and a second liquid inlet valve 24, and displaying the real-time pressure through a first pressure gauge 14, a second pressure gauge 19, a third pressure gauge 23 and a fourth pressure gauge 28.
4. In the process of a membrane pollution experiment, a first membrane flux real-time monitoring device 22 and a second membrane flux real-time monitoring device 31 are used for respectively collecting the produced water of a first cross-flow nanofiltration device 16 and a second cross-flow nanofiltration device 25 and measuring the quality change of the produced water; the computer 32 receives the quality change data of the produced water from the first cross-flow nanofiltration device 16 and the second cross-flow nanofiltration device 25 and then passes the data through the formula (1)
(wherein J, V, A, t is real-time membrane flux, real-time membrane flux permeate volume, membrane area, and operation time, respectively) to obtain initial membrane flux Jo and real-time membrane flux Jc at different time points in the contamination process, and then using formula (2)
(NfFor real-time normalized membrane flux) to obtain real-time normalized membrane flux Nf at different time points, i.e. the variation of the normalized membrane flux with the lapse of experimental time, as shown in fig. 2. Wherein formula (1) and formula (2) are from the third page of the Behaviours and mechanisms of nanofiltering membrane formation by means of differential molecular weights in branched water Desalination paper (https:// doi. org/10.1016/j. desal.2019.06.024) from the desalinization journal, incorporated by EsWeil Press. As can be seen from fig. 2, the membrane flux decreases faster in 0-800 min, which may be caused by that under high-pressure operation, the salt ion concentration on the membrane surface and in the vicinity thereof is much higher than that in the main solution, when the salt ion concentration reaches the solubility product of the corresponding precipitate or the saturation of the crystalline salt, precipitates or precipitated crystalline salt are formed on the membrane surface and in the vicinity thereof, and migrate and adhere to the membrane surface along with the osmotic driving force, gradually blocking the membrane pores and reducing the effective filtration area, and the membrane flux further decreases as the membrane pollution increases more and more severely along with the increase of the filtration time; during 800-1400 min, the membrane flux decline tends to be gentle, the membrane surface is seriously polluted at this stage, and a compact filter cake layer with a certain thickness is formed on the membrane surface.
In the membrane pollution experiment process, a first optical coherence tomography scanner 18 and a second optical coherence tomography scanner 27 are used for respectively monitoring the real-time growth of the surface pollution layer of the nanofiltration membrane in the first cross-flow nanofiltration device 16 and the second cross-flow nanofiltration device 25, the optical coherence tomography scanner is used for observing the area of a membrane of 0.1cm multiplied by 0.1cm in real time through an observation window arranged on the cross-flow nanofiltration device, vertical 2D images are obtained from the device at intervals of 1h, and the sizes of the images in the x direction and the z direction are respectively 1000 pixels multiplied by 800 pixels; the computer 32 receives the optical image signals from the first optical coherence tomography 18 and the second optical coherence tomography 27, evaluates the thickness of the fouling layer in the obtained images by ImageJ image processing software, adjusts the obtained black and white images using the Fire lookup table in ImageJ to distinguish between the membrane surface (yellow) and the fouling layer (purple), determines the thickness of the fouling layer by converting the pixels in the images to a metric scale (a 1 mm glass slide is used as a reference for measuring the fouling thickness, there are 330 pixels in 1 mm, so 1 pixel is converted to 3 μm.), and the resulting change of the fouling layer thickness on the membrane surface over time is shown in fig. 3, from which it can be seen that the fouling deposition rate on the membrane surface is fast during 0-800 min and slow during 800-1400 min, at the moment, a relatively thick dirt layer is formed on the surface of the membrane, and the dirt layer gradually tends to be compact and stable under the action of cross-flow shearing force. The growth of the fouling layer is consistent with the descending trend of the membrane flux, which shows that the dynamic growth of the fouling on the membrane surface along with the time can be effectively monitored by an optical coherence tomography scanner.
Claims (5)
1. An equipment for monitoring the membrane surface pollution behavior in high-salinity wastewater treatment in real time is characterized in that the equipment is formed by combining an ultrafiltration pretreatment system, a cross-flow nanofiltration parallel system, a real-time membrane surface pollution behavior monitoring system and a real-time data acquisition system;
the cross-flow nanofiltration parallel system is formed by combining a first cross-flow nanofiltration subsystem, a second cross-flow nanofiltration subsystem and a water delivery subsystem, wherein the first cross-flow nanofiltration subsystem and the second cross-flow nanofiltration subsystem are connected in parallel, and the water delivery subsystem is used for conveying pretreated wastewater for the two sets of cross-flow nanofiltration subsystems, the first cross-flow nanofiltration subsystem comprises a first cross-flow nanofiltration device (16), and the second cross-flow nanofiltration subsystem comprises a second cross-flow nanofiltration device (25);
the real-time monitoring membrane surface pollution behavior system consists of a first optical coherence tomography scanner (18), a second optical coherence tomography scanner (27), a first membrane flux real-time monitoring device (22) and a second membrane flux real-time monitoring device (31);
the real-time data acquisition system is a computer (32) provided with data acquisition and processing software;
the ultrafiltration pretreatment system is connected with a water delivery subsystem in the cross-flow nanofiltration parallel system through a pipe fitting so as to convey pretreated wastewater to the water delivery subsystem; an observation head of the first optical coherence tomography scanner (18) is combined with a first observation window (17) arranged on the first cross-flow nanofiltration device (16), and an observation head of the second optical coherence tomography scanner (27) is combined with a second observation window (26) arranged on the second cross-flow nanofiltration device (25); the first membrane flux real-time monitoring device (22) is connected with a water production outlet of the first cross-flow nanofiltration device (16) through a pipe fitting, and the second membrane flux real-time monitoring device (31) is connected with a water production outlet of the second cross-flow nanofiltration device (25) through a pipe fitting; the computer (32) is respectively connected with the first optical coherence tomography scanner (18), the second optical coherence tomography scanner (27), the first membrane flux real-time monitoring device (22) and the second membrane flux real-time monitoring device (31) through data lines so as to receive the information of the surface pollution condition of the nanofiltration membrane in the first cross-flow nanofiltration device (16) and the second cross-flow nanofiltration device (25) from the first optical coherence tomography scanner, the second optical coherence tomography scanner (27), the first membrane flux real-time monitoring device and the second membrane flux real-time monitoring device and process and store the information.
2. The apparatus for monitoring the membrane surface pollution behavior in the high-salinity wastewater treatment in real time according to claim 1, characterized in that the water delivery subsystem in the cross-flow nanofiltration parallel system is composed of a second water delivery pump (8), a heat exchanger (9), a jacket water bath water storage tank (10), a third water delivery pump (11), a high-pressure pump (12) and a flow control valve (13), wherein the second water delivery pump (8), the water storage tank of the jacket water bath water storage tank (10), the third water delivery pump (11) and the high-pressure pump (12) are sequentially connected through pipes, the heat exchanger (9) is connected with the jacket of the jacket water bath water storage tank (10) through a pipe fitting, a liquid inlet of the flow control valve (13) is connected with a liquid outlet of the high-pressure pump (12) through a pipe fitting, and a liquid outlet of the flow control valve (13) is connected with the water storage tank of the jacket water bath water storage tank (10;
the first cross-flow nanofiltration subsystem is formed by sequentially connecting a first pressure gauge (14), a first liquid inlet valve (15), a first cross-flow nanofiltration device (16), a second pressure gauge (19), a first back pressure regulator (20) and a first flow meter (21) through pipe fittings, and the second cross-flow nanofiltration subsystem is formed by sequentially connecting a third pressure gauge (23), a second liquid inlet valve (24), a second cross-flow nanofiltration device (25), a fourth pressure gauge (28), a second back pressure regulator (29) and a second flow meter (30) through pipe fittings.
3. The equipment for monitoring the membrane surface pollution behavior in the high-salinity wastewater treatment in real time according to claim 2, characterized in that the ultrafiltration pretreatment system is formed by sequentially connecting an adjusting tank (1), a first water delivery pump (3), a filter (4), an ultrafiltration device (5) and a produced water storage tank (6) through pipes, wherein a first emptying valve (2) is arranged at the lower part of the adjusting tank (1), and a second emptying valve (7) is arranged at the lower part of the produced water storage tank (6); the water production storage pool (6) is connected with a liquid inlet of a second water delivery pump (8) in the water delivery subsystem through a pipe fitting.
4. The apparatus for real-time monitoring of membrane surface contamination behavior in high-salinity wastewater treatment according to claim 3, wherein the concentrated water outlet of the first cross-flow nanofiltration device (16) in the first cross-flow nanofiltration subsystem and the concentrated water outlet of the second cross-flow nanofiltration device (25) in the second cross-flow nanofiltration subsystem are respectively connected with the regulating tank (1) in the ultrafiltration pretreatment system through pipes.
5. The apparatus for real-time monitoring membrane surface fouling behavior in high-salinity wastewater treatment according to any of claims 1 to 4, characterized in that the first membrane flux real-time monitoring device (22) and the second membrane flux real-time monitoring device (31) in the real-time monitoring membrane surface fouling behavior system are both composed of an electronic balance and a water container placed on the electronic balance, and the electronic balance is connected with the computer (32) through a data line.
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| CN202011099846 | 2020-10-14 | ||
| CN2020110998467 | 2020-10-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114409154A (en) * | 2022-02-25 | 2022-04-29 | 上海大学 | Reduce processing apparatus that membrane of soluble algae organic matter pollutes |
| CN115041022A (en) * | 2022-06-29 | 2022-09-13 | 武汉大学 | System and method for monitoring membrane infiltration process in membrane distillation on line |
| CN117101419A (en) * | 2023-10-23 | 2023-11-24 | 山东卫康生物医药科技有限公司 | Medical functional food production control system |
| CN118387988A (en) * | 2024-06-28 | 2024-07-26 | 浙江钱江水利供水有限公司 | Intelligent membrane replacing system for detecting pH value of water sample |
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2020
- 2020-12-28 CN CN202011585660.2A patent/CN112619431A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114409154A (en) * | 2022-02-25 | 2022-04-29 | 上海大学 | Reduce processing apparatus that membrane of soluble algae organic matter pollutes |
| CN115041022A (en) * | 2022-06-29 | 2022-09-13 | 武汉大学 | System and method for monitoring membrane infiltration process in membrane distillation on line |
| CN117101419A (en) * | 2023-10-23 | 2023-11-24 | 山东卫康生物医药科技有限公司 | Medical functional food production control system |
| CN117101419B (en) * | 2023-10-23 | 2024-01-09 | 山东卫康生物医药科技有限公司 | Medical functional food production control system |
| CN118387988A (en) * | 2024-06-28 | 2024-07-26 | 浙江钱江水利供水有限公司 | Intelligent membrane replacing system for detecting pH value of water sample |
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