CN113024003A

CN113024003A - Integrated electric auxiliary micro-filtration, ultra-filtration and nanofiltration membrane performance comprehensive test platform

Info

Publication number: CN113024003A
Application number: CN202110284992.5A
Authority: CN
Inventors: 全燮; 张海光; 杜磊; 陈硕; 于洪涛; 姬保江
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2021-06-25
Anticipated expiration: 2041-03-17
Also published as: CN113024003B

Abstract

An integrated electric-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform comprises a pretreatment system, a membrane filtration system, a post-treatment system, an online monitoring system, a display system and a power distribution system. The pretreatment system, the membrane filtration system and the post-treatment system are connected through stainless steel pipelines; the membrane filtration system comprises a microfiltration membrane filtration pipeline, an ultrafiltration membrane filtration pipeline, a nanofiltration membrane filtration pipeline and an immersed negative pressure membrane filtration pipeline; the power distribution system comprises a membrane voltage regulation power supply which is connected to a membrane (component) to be tested through a lead to provide voltage. The testing platform can automatically operate and be manually controlled, the membrane filtration performance can be tested in situ on line, the testing result can be displayed on a touch display screen and related instruments, and the permeability, interception performance, separation performance and membrane pollution resistance of microfiltration, ultrafiltration and nanofiltration membranes under the assistance of electricity can be tested; the electrically-assisted membrane (module) can be tested and evaluated in a pressure filtration and negative pressure filtration mode.

Description

Integrated electric auxiliary micro-filtration, ultra-filtration and nanofiltration membrane performance comprehensive test platform

Technical Field

The invention relates to the field of membrane separation water treatment.

Background

The membrane separation technology has the advantages of high efficiency, energy conservation, environmental protection, simple and convenient operation, easy scale production and the like, becomes an important technology for solving the problems of resources, energy and environment faced by human at present, and is one of the high and new technologies with development prospects in the 21 st century. In recent years, the membrane separation technology is rapidly developed, and the membrane separation technology has wide development prospects in the aspects of drinking water treatment, sewage advanced treatment, chemical wastewater treatment, seawater brackish water desalination treatment and the like. Separation membranes are the core of membrane separation technology. In general, there is a contradiction between the permeability and the selectivity of the separation membrane, and the separation membrane also faces a serious membrane fouling problem during operation. The coupling of electricity and membrane separation technology can effectively improve the separation performance of the membrane through electrochemical interaction, electrochemical reaction or electric field action and the like, and can also slow down membrane pollution. Under the electric assistance, the energy consumption of ton water treatment in the membrane filtration process can be obviously reduced. Therefore, the electric auxiliary membrane separation has important significance for obtaining high membrane separation performance and good water treatment effect and promoting the application of the membrane separation technology in the field of water treatment.

For different separation membranes and membrane separation processes, the testing of the membrane separation performance is very important for the preparation, research and application of the separation membranes and is a key step for ensuring the quality of the separation membranes. Several patented technologies have been proposed for testing the performance of membranes. CN203694926U discloses a membrane module separation performance testing platform, which can test and evaluate the separation performance of membrane modules under different pressures and treatment capacities. CN105013330B provides a membrane performance test platform with double test functions and a use method thereof, the platform is used for detecting the flux, the rejection rate, the molecular weight cut-off and the maximum pressure of a membrane product, and the measurement result is not influenced by temperature factors. In addition, some patented technologies of membrane performance testing devices, such as CN210964672U, CN112414921A, CN102049199B, and CN102407078A, have been previously disclosed. However, the existing membrane performance test platform can only test the separation performance (membrane flux, rejection rate, molecular weight cut-off and the like) of the separation membrane, and cannot directly test the separation performance of the membrane under the assistance of electricity. In addition, the function of the existing test platform is single, the membrane processes of different separation membranes and different filtration modes are difficult to test and research, and the test result of the membrane performance is difficult to provide practical basic experimental data for the design of pilot plant and industrial devices. Patent technologies relating to membrane electrode performance testing devices, such as CN110988697A, CN110988697A and CN109946519A, have been previously disclosed, but such membrane electrodes are significantly different from the electrically assisted separation membranes referred to in this patent. Therefore, there is a need for a new and comprehensive testing platform for testing the performance of electrically assisted membranes.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the following technical scheme: the utility model provides an integrative electric auxiliary micro-filtration, ultrafiltration and receive filter membrane performance integrated test platform which characterized in that, this test platform includes pretreatment systems I, membrane filtration system II, the after treatment system III that connects gradually, and distribution system IV links to each other with membrane filtration system II, on-line monitoring system V and display system VI respectively. The membrane filtration system II is also connected with an online monitoring system V. And the online monitoring system V is connected with the display system VI. The lower part and the upper part of the side surface of the raw water tank are respectively provided with a cooling reflux water inlet pipe i and a cooling reflux water outlet pipe ii, and the lower part of the side surface is also provided with a raw water discharge pipe iii. The raw water tank is connected with the water inlet end of a pump i through a pipe iv, a return pipe vi is arranged on a pipe v connected with the water outlet end of the pump i, and a flow meter i and an electric regulating valve i are arranged on the return pipe vi. And a water outlet pipe v of the pump i is connected with a pipe vii and a pipe viii through a safety valve i, wherein the pipe vii is connected with a pipe ix through a control valve i, a pressure gauge i and a flow meter ii, and is connected with a pipe xxi through a control valve iv and a control valve vii. The pipe viii is connected with the water inlet end of the pretreatment filter i through a control valve ii, the pretreatment filter i is connected with the pretreatment filter ii in series, the water outlet end of the pretreatment filter ii is connected with a pressure gauge i through a pipe x and a control valve iii, and is connected with the water inlet end of the pretreatment ultrafiltration membrane component through a flow meter ii and a control valve v on a pipe xi. The pretreatment ultrafiltration membrane component is a pretreatment component before the nanofiltration membrane to be detected is filtered. The permeation water outlet end of the pretreatment ultrafiltration membrane component is connected with a pipe xii and enters the nanofiltration water storage tank through a pipe xiii. There are control valves vi and viii on tubes xii and xiii, respectively. The lower part and the upper part of the side surface of the nanofiltration water storage tank are respectively provided with a cooling reflux water inlet pipe xiv and a cooling reflux water outlet pipe xv, and the lower part of the side surface is also provided with a raw water discharge pipe xvi. The nanofiltration water storage tank is connected with the water inlet end of the pump ii through a pipe xvii, a return pipe xix is arranged on a pipe xviii connected with the water outlet end of the pump ii, and a flow meter iii and an electric control valve ii are arranged on the return pipe xix. The outlet pipe xviii of the pump ii is connected to the pipe xx via a safety valve ii and to the pipe xxi via a control valve ix. A pressure gauge ii, a flow meter iv and an online detection sensor i are provided on the pipe xxi and are connected to the pipe xxii, the pipe xxiii, the pipe xxiv and the pipe xxv, respectively. The on-line detection sensor i is a temperature sensor, a pH sensor, a conductivity sensor, a turbidity sensor, a COD sensor, an ammonia nitrogen sensor, a nitrite sensor and a nitrate sensor. The tube xxii is connected with a micro-filtration membrane component to be tested through a control valve x, the micro-filtration membrane component to be tested is an electric auxiliary membrane filtration component, and the preferable size range of the micro-filtration membrane component to be tested is 100-400 mm multiplied by 50-200 mm multiplied by 50-250 mm. The tube xxiii is connected with an ultrafiltration membrane component to be tested through a control valve xi, the ultrafiltration membrane component to be tested is an electrically-assisted membrane filtration component, and the preferred size range of the ultrafiltration membrane component to be tested is 100-400 mm multiplied by 50-200 mm multiplied by 50-250 mm. The tube xxiv is connected with a nanofiltration membrane component to be detected through a control valve xii, the nanofiltration membrane component to be detected is an electric auxiliary membrane filtering component, and the preferred size range of the nanofiltration membrane component to be detected is 100-400 mm multiplied by 50-200 mm multiplied by 50-250 mm. Tube xxv is connected to the submerged membrane tank via control valve xiii. The microfiltration membrane component, the ultrafiltration membrane component, the nanofiltration membrane component and the immersed membrane tank to be detected are detachable and replaceable components. And the permeation water outlet ends of the microfiltration membrane component, the ultrafiltration membrane component and the nanofiltration membrane component to be detected are respectively connected with a pipe xxvi, a pipe xxvii and a pipe xxviii, and the three pipelines are respectively connected with a control valve xiv, a control valve xv and a control valve xvi. The cross-flow water outlet ends of the microfiltration membrane component, the ultrafiltration membrane component and the nanofiltration membrane component to be detected are respectively connected with a pipe xxix, a pipe xxx and a pipe xxxi and are respectively connected with a pipe xxxii through a control valve xvii, a control valve xviii and a control valve xix. And the tube xxxii is connected with the tube xxxiii and the tube xxxiv after passing through the pressure gauge iii and the flow sensor v, the tube xxxiii is provided with an electric regulating valve iii, and the tube xxxiv is provided with an electric regulating valve iv. The tube xxxiv is connected with the tube xxxv and the tube xxxvi, the tube xxxv is provided with a control valve xx, and the tube xxxvi is provided with a control valve xxi. The water outlet end of the submerged membrane tank is connected with a pipe xxxvii, and the pipe xxxvii is provided with a control valve xxii. The immersed membrane pool to be tested is internally provided with an immersed membrane component to be tested, the immersed membrane component to be tested is an electric auxiliary membrane filtering component, and the optimal size range of the immersed membrane component to be tested is 100-400 mm multiplied by 50-300 mm multiplied by 50-150 mm. And the permeation water outlet end of the immersed membrane component to be tested is sequentially connected with a pressure gauge iv, an electric regulating valve v and a vacuum pump through a pipe xxxviii. A control valve xxiii is arranged on the tube xxxix after the vacuum pump and is respectively connected with the output ends of the tube xxvi, the tube xxvii and the tube xxviii and the input end of the tube xl. The tube xl is provided with a pressure gauge v, a flow meter vi and an online detection sensor ii and is connected with the tube xli and the tube xlii. Wherein, the on-line detection sensor ii is a temperature sensor, a pH sensor, a conductivity sensor, a turbidity sensor, a COD sensor, an ammonia nitrogen sensor, a nitrite sensor and a nitrate sensor. Tube xli is connected to tube xliv via control valve xxiv. The tube xlii is connected to the water inlet end of the post-treatment filter via a control valve xxv. The outlet end of the post-treatment filter is connected to a tube xliii which is connected to a tube xliv via a control valve xxvi. The membrane voltage regulating power supply is connected with the microfiltration membrane component, the ultrafiltration membrane component, the nanofiltration membrane component and the immersed membrane component to be detected through a lead i and a lead ii to provide voltage.

The electric auxiliary micro-filtration, ultra-filtration and nanofiltration membrane performance comprehensive test platform has the main advantages and beneficial effects that: the structure is reasonable and compact, and the use is convenient; secondly, an automatic control system is arranged, so that the automatic control system can operate automatically and can be controlled manually; the online monitoring device is arranged, the flow, pressure, temperature, pH, conductivity, turbidity, COD, ammonia nitrogen, nitrite and nitrate in the membrane filtration process can be tested in situ online, and the test result can be displayed on a touch display screen and related instruments; the method can be used for testing the filtration performance of the microfiltration membrane, the ultrafiltration membrane and the nanofiltration membrane, including the permeability, the interception performance, the separation performance and the anti-membrane pollution performance of the membrane, and can also be used for testing the filtration performance of the microfiltration membrane, the ultrafiltration membrane and the nanofiltration membrane under the electric assistance to evaluate the membrane performance under the electric assistance; testing and evaluating the electric auxiliary membrane (assembly) in a pressure filtration and negative pressure filtration mode; sixth, the membrane module can be disassembled and replaced, and is suitable for various types of separation membranes and membrane modules, including: flat sheet membranes (modules), hollow fiber membranes (modules), tubular membranes (modules), and spiral membranes (modules); the test platform comprises a pretreatment part and a post-treatment part, and can test the treatment performance of the separation membrane on surface water, underground water, secondary effluent of a sewage plant, industrial wastewater, prepared simulated sewage and the like so as to provide practical basic experimental data for the design of pilot-scale and industrialized devices.

Drawings

FIG. 1 is a schematic diagram of the integrated electric-assisted micro-filtration, ultra-filtration and nanofiltration membrane performance comprehensive test platform module.

FIG. 2 is a schematic view of a process flow of an integrated electrically-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform.

Fig. 3 is a schematic perspective view (front view) of an integrated electrically-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform in an embodiment of the invention.

Fig. 4 is a schematic perspective view (back side) of an integrated electrically-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform according to an embodiment of the present invention.

Description of reference numerals:

the dashed boxes in fig. 2 are labeled I: pretreatment system, II: membrane filtration system, III: post-treatment system, IV: power distribution system, V: provided is an online monitoring system. The dashed boxes in fig. 3 are labeled VI: a display system.

In fig. 2, 3 and 4: 1. a raw water tank, 2, a pump i, 3, a flow meter i, 4, an electric control valve i, 5, a safety valve i, 6, a control valve i, 7, a control valve ii, 8, a pretreatment filter i, 9, a pretreatment filter ii, 10, a control valve iii, 11, a pressure gauge i, 12, a flow meter ii, 13, a control valve iv, 14, a control valve v, 15, a pretreatment ultrafiltration membrane module, 16, a control valve vi, 17, a control valve vii, 18, a control valve viii, 19, a nanofiltration water storage tank, 20, a pump ii, 21, a flow meter iii, 22, an electric control valve ii, 23, a safety valve ii, 24, a control valve ix, 25, a pressure gauge ii, 26, a flow meter iv, 27, an online detection sensor i, 28, a control valve x, 29, a control valve xi, 30, a control valve xii, 31, a control valve xiii, 32, a microfiltration membrane module to be detected, 33, an ultrafiltration membrane module to be detected, 34, a nanofiltration membrane module to be detected, 35. an immersed membrane cell 36, a control valve xiv, 37, a control valve xv, 38, a control valve xvi, 39, a control valve xvii, 40, a control valve xviii, 41, a control valve xix, 42, a pressure gauge iii, 43, a flow meter v, 44, an electric control valve iii, 45, an electric control valve iv, 46, a control valve xx, 47, a control valve xxi, 48, a control valve xxii, 49, an immersed membrane module to be tested, 50, a pressure gauge iv, 51, an electric control valve v, 52, a vacuum pump, 53, a control valve xxiii, 54, a pressure gauge v, 55, a flow meter vi, 56, an on-line detection sensor ii, 57, a control valve xxiv, 58, a control valve xxv, 59, a post-treatment filter, 60, a control valve xxvi, 61, a membrane voltage regulation power supply, 62, a touch display screen, 63, a display screen of a membrane voltage regulation power supply, 64, a power supply, 65, a quick plug, a stainless steel square terminal, 66, and a plug-in frame, 67. a switch 68, an indicator light 69 and an electric cabinet; and G1, tube i, G2, tube ii, G3, tube iii, G4, tube iv, G5, tube v, G6, tube vi, G7, tube vii, G8, tube viii, G9, tube ix, G10, tube x, G10, tube xi, G10, tube xii, G10, tube xiii, G10, tube xiv, G10, tube xv, G10, tube xvi, G10, tube xvii, G10, tube xviii, G10, tube xxvi, G10, tube xxxi, G10, tube xxi, tube xxvi, G10, tube xxxi, tube xxvi, G10, tube xxxi, tube xxix, tube xxii, tube xxvi, tube xxv, G10, tube xxvi, tube xxv, tube xxvi, G10, tube xxvi, tube xxv, tube 10, tube xxvi, tube xxv, tube 10, tube xxv, tube xxvi, tube xxv, tube 10, tube xxvi, tube xxg 10, tube xxvi.

Detailed Description

The invention is further illustrated with reference to the following figures and examples: an integrated electric-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform, wherein a pretreatment system I, a membrane filtration system II and a post-treatment system III are sequentially connected through stainless steel pipelines. Membrane filtration system II includes four pipelines: the device comprises a micro-filtration membrane filtration pipeline, an ultrafiltration membrane filtration pipeline, a nanofiltration membrane filtration pipeline and an immersed negative pressure membrane filtration pipeline, wherein the pretreatment system I and the post-treatment system III are shared by the four pipelines. The stainless steel pipeline is provided with a safety valve, a control valve and an electric regulating valve, different membrane performance testing pipelines are regulated and switched through the control valve, and the pressure and the flow are regulated through the electric regulating valve. And the power distribution system IV is respectively connected with the membrane filtration system II, the on-line monitoring system V and the display system VI through circuit lines. The membrane filtration system II is also connected with an online monitoring system V. And the online monitoring system V is connected with the display system VI. The lower part and the upper part of the side surface of the raw water tank 1 are respectively provided with a cooling reflux water inlet pipe i-G1 and a cooling reflux water outlet pipe ii-G2, and the lower part of the side surface is also provided with a raw water discharge pipe iii-G3. The raw water tank 1 is connected with the water inlet end of a pump i-2 through a pipe iv-G4, a return pipe vi-G6 is arranged on a pipe v-G5 connected with the water outlet end of the pump i-2, and a flow meter i-3 and an electric regulating valve i-4 are arranged on the return pipe vi-G6. The water outlet pipe v-G5 of the pump i-2 is connected with the pipes vii-G7 and the pipes viii-G8 after passing through a safety valve i-5, wherein the pipes vii-G7 are connected with the pipes ix-G9 through a control valve i-6, a pressure gauge i-11 and a flow meter ii-12, and are connected with the pipes xxi-G21 through a control valve iv-13 and a control valve vii-17. Tubing viii-G8 was connected to the water inlet end of pretreatment filter i-8 via control valve ii-7, and pretreatment filter i-8 was connected in series with pretreatment filter ii-9. The pretreatment filters i-8 and ii-9 are respectively one of a sand filter, a PP cotton filter, a multi-medium filter, an activated carbon filter and a precision filter. The outlet end of the pretreatment filter ii-9 is connected with a pressure gauge i-11 through a pipe x-G10 and a control valve iii-10, and is connected with the inlet end of the pretreatment ultrafiltration membrane module 15 through a flow meter ii-12 and a control valve v-14 on a pipe xi-G11. The pretreatment ultrafiltration membrane component 15 is a pretreatment component before the filtration of the nanofiltration membrane to be detected. The permeate water outlet end of the pretreatment ultrafiltration membrane assembly 15 is connected with a pipe xii-G12 and enters the nanofiltration water storage tank 19 through a pipe xiii-G13. The tubes xii-G12 and xiii-G13 have control valves vi-16 and viii-18, respectively. The lower part and the upper part of the side surface of the nanofiltration water storage tank 19 are respectively provided with a cooling reflux water inlet pipe xiv-G14 and a cooling reflux water outlet pipe xv-G15, and the lower part of the side surface is also provided with a raw water discharge pipe xvi-G16. The nanofiltration water storage tank 19 is connected with the water inlet end of the pump ii-20 through a pipe xvii-G17, a return pipe xix-G19 is arranged on a pipe xviii-G18 connected with the water outlet end of the pump ii-20, and a flow meter iii-21 and an electric control valve ii-22 are arranged on the return pipe xix-G19. An outlet pipe xviii-G18 of the pump ii-20 is connected to a pipe xx-G20 through a safety valve ii-23 and to a pipe xxi-G21 through a control valve ix-24. Tubes xxi-G21 are provided with pressure gauges ii-25, flow meters iv-26, and in-line detection sensors i-27 and are connected to tubes xxii-G22, tubes xxiii-G23, tubes xxiv-G24, and tubes xxv-G25, respectively. The on-line detection sensors i-27 are a temperature sensor, a pH sensor, a conductivity sensor, a turbidity sensor, a COD sensor, an ammonia nitrogen sensor, a nitrite sensor and a nitrate sensor. The tube xxii-G22 is connected with the micro-filtration membrane assembly 32 to be tested through a control valve x-28, and the micro-filtration membrane assembly 32 to be tested is an electric auxiliary membrane filtration assembly, and the preferred size range is 100-400 mm multiplied by 50-200 mm multiplied by 50-250 mm. The tube xxiii-G23 is connected with the ultrafiltration membrane component 33 to be tested through a control valve xi-29, the ultrafiltration membrane component 33 to be tested is an electrically-assisted membrane filtration component, and the optimal size range of the ultrafiltration membrane component 33 to be tested is 100-400 mm multiplied by 50-200 mm multiplied by 50-250 mm. The tube xxiv-G24 is connected with the nanofiltration membrane component 34 to be tested through the control valve xii-30, and the nanofiltration membrane component 34 to be tested is an electric auxiliary membrane filtration component, and the preferred size range of the nanofiltration membrane component is 100-400 mm multiplied by 50-200 mm multiplied by 50-250 mm. The pipe xxv-G25 is connected to the submerged membrane tank 35 via the control valve xiii-31. The micro-filtration membrane component 32, the ultrafiltration membrane component 33, the nanofiltration membrane component 34 and the submerged membrane pool 35 to be tested are detachable and replaceable components. The water inlet end, the permeation water outlet end and the cross flow water outlet end of the micro-filtration membrane component 32, the ultra-filtration membrane component 33 and the nano-filtration membrane component 34 to be detected are respectively connected with the pipeline through hoses. The permeation water outlet ends of the micro-filtration membrane assembly 32, the ultrafiltration membrane assembly 33 and the nanofiltration membrane assembly 34 to be tested are respectively connected with a pipe xxvi-G26, a pipe xxvii-G27 and a pipe xxviii-G28, and the three pipelines are respectively connected with a control valve xiv-36, a control valve xv-37 and a control valve xvi-38. The cross-flow water outlet ends of the micro-filtration membrane assembly 32, the ultrafiltration membrane assembly 33 and the nanofiltration membrane assembly 34 to be tested are respectively connected with a pipe xxix-G29, a pipe xxx-G30 and a pipe xxxi-G31, and are respectively connected with a pipe xxxii-G32 through a control valve xvii-39, a control valve xviii-40 and a control valve xix-41. Tube xxxiii-G32 passes through pressure gauge iii-42, flow sensor v-43, and connects to tube xxxiii-G33 and tube xxxiv-G34. An electric regulating valve iii-44 is arranged on the pipe xxxiii-G33; and an electric regulating valve iv-45 is arranged on the pipe xxxiv-G34. The tube xxxiv-G34 is connected with the tube xxxv-G35 and the tube xxxvi-G36, the tube xxxv-G35 is provided with a control valve xx-46, and the tube xxxvi-G36 is provided with a control valve xxi-47. The outlet end of the submerged membrane tank 35 is connected to a pipe xxxvii-G37, and a control valve xxii-48 is provided on the pipe xxxvii-G37. The immersed membrane pool 35 is internally provided with an immersed membrane module 49 to be tested, the immersed membrane module 49 to be tested is an electric auxiliary membrane filtering module, and the optimal size range of the immersed membrane module 49 to be tested is 100-400 mm multiplied by 50-300 mm multiplied by 50-150 mm. The permeation water outlet end of the immersed membrane module 49 to be tested is connected with a pressure gauge iv-50, an electric regulating valve v-51 and a vacuum pump 52 in sequence through a pipe xxxviii-G38. A control valve xxiii-53 is provided in tube xxxix-G39 after vacuum pump 52 and is connected to the output of tubes xxvi-G26, tube xxvii-G27 and tube xxviii-G28, respectively, and to the input of tube xl-G40. The tube xl-G40 is provided with a pressure gauge v-54, a flow meter vi-55 and an on-line detection sensor ii-56 and is connected to the tube xli-G41 and the tube xli-G42. Wherein, the on-line detection sensors ii-56 are a temperature sensor, a pH sensor, a conductivity sensor, a turbidity sensor, a COD sensor, an ammonia nitrogen sensor, a nitrite sensor and a nitrate sensor. Tube xli-G41 passes through control valve xxiv-57 and connects to tube xliv-G44. Tube xlii-G42 is connected to the water inlet end of post-treatment filter 59 via control valve xxv-58. The outlet end of the post-treatment filter 59 is connected to a tube xliii-G43, and the tube xliii-G43 is connected to a tube xliv-G44 after passing through a control valve xxvi-60. The membrane voltage regulating power supply 61 is connected with the microfiltration membrane component 32, the ultrafiltration membrane component 33, the nanofiltration membrane component 34 and the submerged membrane component 49 to be tested through leads i-W1 and ii-W2 to provide voltage. Wherein the lead wires i-W1 and ii-W2 are titanium lead wires, copper lead wires or stainless steel lead wires, and the voltage is regulated by the membrane voltage regulating power supply 61. In addition, the test platform further comprises a touch display screen 62, a display screen 63 of a membrane voltage regulation power supply, a power supply wiring terminal 64, a quick connector 65, a stainless steel square frame 66, a switch 67, an indicator lamp 68, an electric cabinet 69, an online monitoring display instrument, and related electric control elements, control software, a control module and electric wires. The control software and the control module have the functions of high-temperature early warning, high-pressure early warning and emergency stop.

Example 1:

the invention relates to an electric auxiliary microfiltration membrane performance test process: surface water is used as raw water for membrane filtration test, the raw water is added into a raw water tank 1, the raw water enters a pump i-2 through a pipe iv-G4, and then passes through a pipe v-G5 and is divided into two branches, one branch of the raw water flows back to the raw water tank 1 through a return pipe vi-G6 and a flow meter i-3 and an electric control valve i-4, the other branch of the raw water flows into a pipe viii-G8 through a safety valve i-5, and is connected with a water inlet end of a pretreatment filter i-8 through a control valve ii-7. The pretreatment filter i-8 is connected with the pretreatment filter ii-9 in series, wherein the pretreatment filter i-8 and the pretreatment filter ii-9 are respectively a quartz sand filter with the diameter of 50 mu m and a PP cotton filter with the diameter of 5 mu m. After pretreatment, the water passes through a pipe x-G10 from the water outlet end of the pretreatment filter ii-9, passes through a control valve iii-10, a pressure gauge i-11 and a flow meter ii-12, enters a pipe ix-G9, passes through a control valve iv-13, a control valve vii-17, a pressure gauge ii-25 on a pipe xxi-G21, a flow meter iv-26 and an online detection sensor i-27, enters a pipe xxii-G22, and passes through a control valve x-28, and enters the micro-filtration membrane assembly 32 to be tested. The microfiltration membrane module 32 to be tested is a carbon nanotube membrane module having dimensions of 350mm × 150mm × 80 mm. The cross-flow effluent of the micro-filtration membrane assembly 32 to be tested passes through a pipe xxix-G29 and enters a pipe xxxii-G32 through a control valve xvii-39, and flows back to the raw water tank 1 through a pressure gauge iii-42, a flow sensor v-43, an electric control valve iv-45 on the pipe xxxiv-G34 and a control valve xx-46 on the pipe xxxv-G35. The permeated effluent of the microfiltration membrane component 32 to be detected passes through a pipe xxvi-G26, passes through a control valve xiv-36, enters a pipe xl-G40, passes through a pressure gauge v-54, a flow meter vi-55, an online detection sensor ii-56 and a control valve xxv-58 on a pipe xlii-G42, and then enters a post-treatment filter 59, wherein the post-treatment filter 59 is an activated carbon filter. After filtration, the product water is discharged through the pipes xliii-G43 and through the control valve xxvi-60 into the pipes xliv-G44. In operation, the membrane voltage regulating power supply 61 applies a voltage across the microfiltration membrane and the corresponding counter electrode via leads i-W1 and ii-W2. Wherein the wires i-W1 and ii-W2 are copper wires, and the applied voltage is regulated by the film voltage regulating power supply 61. And cooling water is introduced into a cooling return pipeline of the raw water tank 1 to avoid overhigh water temperature in the operation process. Controlling the electric regulating valve i-4 to regulate and control the water flow entering the microfiltration membrane component; the cross flow and transmembrane pressure difference of the microfiltration membrane component are regulated and controlled by regulating and controlling the electric regulating valves iv-45. The flow, pressure, temperature, pH, conductance, turbidity, COD concentration, ammonia nitrogen concentration, nitrite concentration and nitrate concentration in the test process are read on a display screen and an instrument.

Example 2:

the invention relates to an electric auxiliary ultrafiltration membrane performance test flow: adopting a prepared humic acid solution (containing 10mM sodium sulfate as electrolyte) as raw water for membrane filtration test, adding the raw water into a raw water tank 1, leading the raw water into a pump i-2 through a pipe iv-G4, then dividing the raw water into two branches through a pipe v-G5, leading one branch of the raw water to flow back to the raw water tank 1 through a return pipe vi-G6 and a flow meter i-3 and an electric regulating valve i-4, leading the other branch of the raw water to flow back to a pipe vii-G7 through a safety valve i-5, leading the other branch of the raw water to flow into a pipe ix-G9 through a control valve iv-13, a control valve vii-17, a pressure meter ii-25, a flow meter iv-26 and an online detection sensor i-27 on a pipe xxi-G21, leading the other branch of the raw water to flow into a pipe xxiii-G23, and then enters the ultrafiltration membrane component 33 to be tested through the control valve xi-29. The ultrafiltration membrane module 33 to be tested is a carbon nanotube membrane filtration module, and the size of the ultrafiltration membrane module is 350mm multiplied by 150 mm. Cross-flow effluent of the ultrafiltration membrane module 33 to be tested passes through a pipe xxx-G30 and enters a pipe xxxii-G32 through a control valve xviii-40, and is discharged after passing through a pressure gauge iii-42, a flow sensor v-43 and an electric control valve iii-44 on a pipe xxxiii-G33. The effluent water of the ultrafiltration membrane module 33 to be tested passes through a pipe xxvii-G27, passes through a control valve xv-37, enters a pipe xl-G40, passes through a pressure gauge v-54, a flow meter vi-55, an online detection sensor ii-56 and a control valve xxiv-57 on a pipe xli-G41, enters a pipe xliv-G44, and is discharged as produced water. In operation, membrane voltage regulating power supply 61 applies a voltage across the ultrafiltration membrane and corresponding counter electrode via leads i-W1 and ii-W2. Wherein the wires i-W1 and ii-W2 are stainless steel wires, and the applied voltage is regulated by the film voltage regulating power supply 61. And cooling water is introduced into a cooling return pipeline of the raw water tank 1 to avoid overhigh water temperature in the operation process. Regulating and controlling the water flow entering the ultrafiltration membrane component to be measured by controlling the electric regulating valve i-4; and regulating the cross flow rate and transmembrane pressure difference of the ultrafiltration membrane component to be detected by regulating and controlling the electric regulating valves iv-45. The flow, pressure, temperature, pH, conductance, turbidity, COD concentration, ammonia nitrogen concentration, nitrite concentration and nitrate concentration in the test process are read on a display screen and an instrument.

Example 3:

the invention relates to a process for testing the performance of an electrically-assisted nanofiltration membrane: underground brackish water is used as raw water for a membrane filtration test, the raw water is added into a raw water tank 1, the raw water enters a pump i-2 through a pipe iv-G4, and then is divided into two branches through a pipe v-G5, one branch of the raw water passes through a return pipe vi-G6 and then flows back to the raw water tank 1 through a flowmeter i-3 and an electric control valve i-4, the other branch of the raw water passes through a safety valve i-5 and enters a pipe viii-G8, and then the other branch of the raw water passes through a control valve ii-7 and is connected with a water inlet end of a pretreatment filter i-8. The pretreatment filter i-8 is connected with the pretreatment filter ii-9 in series, wherein the pretreatment filters i-8 and ii-9 are respectively a PP cotton filter with the diameter of 5 mu m and a PP cotton filter with the diameter of 1 mu m. After pretreatment, the pretreated water enters a pipe xi-G11 from the water outlet end of the pretreatment filter ii-9 through a pipe x-G10 and a control valve iii-10, a pressure gauge i-11 and a flow meter ii-12, and then enters a pretreatment ultrafiltration membrane assembly 15 through a control valve v-14. The permeate water of the pretreatment ultrafiltration membrane module 15 passes through a pipe xii-G12 and a control valve vi-16, and then passes through a pipe xiii-G13 and a control valve viii-18, and enters a nanofiltration water storage tank 19. Water in the nanofiltration water storage tank 19 enters a pump ii-20 through a pipe xvii-G17, then passes through a pipe xviii-G18 and is divided into two branches, one branch passes through a return pipe xix-G19 and then returns to the nanofiltration water storage tank 19 through a flow meter iii-21 and an electric regulating valve ii-22, the other branch passes through a safety valve ii-23 and enters a pipe xx-G20, and then enters a pipe xxiv-G24 through a control valve ix-24, a pressure meter ii-25 on the pipe xxi-G21, a flow meter iv-26 and an online detection sensor i-27, and finally enters a nanofiltration membrane assembly 34 to be detected through a control valve xii-30. The nanofiltration membrane component 34 to be measured is a graphene membrane filtration component, and the size of the graphene membrane filtration component is 150mm × 100mm × 80 mm. The cross-flow effluent of the nanofiltration membrane component 34 to be detected flows through a pipe xxxi-G31 and a control valve xix-41 into a pipe xxxii-G32, and flows back to the nanofiltration water storage tank 19 through a pressure gauge iii-42, a flow sensor v-43, an electric control valve iv-45 on the pipe xxxiv-G34 and a control valve xxi-47 on the pipe xxxvi-G36. The effluent water of the nanofiltration membrane component 34 to be detected passes through a pipe xxviii-G28, passes through a control valve xvi-38, enters a pipe xl-G40, passes through a pressure gauge v-54, a flow meter vi-55, an online detection sensor ii-56 and a control valve xxv-58 on a pipe xlii-G42, and enters a post-treatment filter 59, wherein the post-treatment filter 59 is an activated carbon filter. After filtration, the product water is discharged through the pipes xliii-G43 and through the control valve xxvi-60 into the pipes xliv-G44. In operation, the membrane voltage regulating power supply 61 applies a voltage to the nanofiltration membrane and the corresponding counter electrode through the leads i-W1 and ii-W2. Wherein the wires i-W1 and ii-W2 are titanium wires, and the applied voltage is regulated by the film voltage regulating power supply 61. And cooling water is introduced into cooling return pipelines of the raw water tank 1 and the nanofiltration water storage tank 19 so as to avoid overhigh water temperature in the operation process. Regulating and controlling the water flow entering the pretreatment ultrafiltration membrane component by controlling the electric regulating valve i-4; and the cross flow and transmembrane pressure difference of the nanofiltration membrane component are regulated and controlled by regulating and controlling the electric regulating valves iv-45. The flow, pressure, temperature, pH, conductance, turbidity, COD concentration, ammonia nitrogen concentration, nitrite concentration and nitrate concentration in the test process are read on a display screen and an instrument.

Example 4:

the invention relates to an electric auxiliary immersed membrane performance test process: the method comprises the steps of adopting the effluent of secondary biochemical treatment of urban sewage treatment factory as raw water for membrane filtration test, adding the raw water into a raw water tank 1, enabling the raw water to enter a pump i-2 through a pipe iv-G4, then dividing the raw water into two branches through a pipe v-G5, enabling one branch to flow back to the raw water tank 1 through a return pipe vi-G6 and a flow meter i-3 and an electric regulating valve i-4, enabling the other branch to flow back to the raw water tank 1 through a safety valve i-5, entering a pipe viii-G8, and connecting the other branch with a water inlet end of a pretreatment filter i-8 through a control valve ii-7. The pretreatment filter i-8 is connected with the pretreatment filter ii-9 in series, wherein the pretreatment filters i-8 and ii-9 are respectively a multi-medium filter and a 1 mu m PP cotton filter. After pretreatment, the water passes through a pipe x-G10 from the water outlet end of the pretreatment filter ii-9, passes through a control valve iii-10, a pressure gauge i-11 and a flow meter ii-12, enters a pipe ix-G9, passes through a control valve iv-13, a control valve vii-17, a pressure gauge ii-25 on a pipe xxi-G21, a flow meter iv-26 and an online detection sensor i-27, enters a pipe xxv-G25, and passes through a control valve xiii-31, and enters an immersed membrane pool 35. Effluent from the submerged membrane tank 35 is returned to the raw water tank 1 through a pipe xxxvii-G37 and through a control valve xxii-48. The immersed membrane pool 35 is internally provided with an immersed membrane module 49 to be tested. The submerged membrane module 49 to be tested is a carbon nanotube membrane filtration module, and its size is 350mm × 150mm × 150 mm. The to-be-tested permeated water of the immersed membrane module 49 passes through a pipe xxxviii-G38, sequentially passes through a pressure gauge iv-50, an electric control valve v-51, a vacuum pump 52 and a control valve xxiii-53 on a pipe xxxix-G39, enters a pipe xl-G40, passes through a pressure gauge v-54, a flow meter vi-55, an online detection sensor ii-56 and a control valve xxv-58 on a pipe xlii-G42, and then enters a post-treatment filter 59, wherein the post-treatment filter 59 is an activated carbon filter. After filtration, the product water is discharged through the pipes xliii-G43 and through the control valve xxvi-60 into the pipes xliv-G44. In operation, membrane voltage regulating power supply 61 applies a voltage across the separation membrane and corresponding counter electrode in the submerged membrane module via wires i-W1 and ii-W2. Wherein the wires i-W1 and ii-W2 are copper wires, and the applied voltage is regulated by the film voltage regulating power supply 61. And cooling water is introduced into a cooling return pipeline of the raw water tank 1 to avoid overhigh water temperature in the operation process. Regulating and controlling the water flow entering the submerged membrane tank by controlling the electric regulating valve i-4; the outlet water flow and transmembrane pressure difference of the immersed membrane module are regulated and controlled by regulating and controlling the electric regulating valve v-51. The flow, pressure, temperature, pH, conductance, turbidity, COD concentration, ammonia nitrogen concentration, nitrite concentration and nitrate concentration in the test process are read on a display screen and an instrument.

The above-mentioned embodiments only express the embodiments of the present invention, but not should be understood as the limitation of the scope of the invention patent, it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the concept of the present invention, and these all fall into the protection scope of the present invention.

Claims

1. An integrated electric-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform is characterized in that the test platform comprises a pretreatment system I, a membrane filtration system II and a post-treatment system III which are sequentially connected, a power distribution system IV is respectively connected with the membrane filtration system II, an online monitoring system V and a display system VI, the membrane filtration system II is also connected with the online monitoring system V, and the online monitoring system V is connected with the display system VI; the lower part and the upper part of the side surface of the raw water tank (1) are respectively provided with a cooling reflux water inlet pipe i (G1) and a cooling reflux water outlet pipe ii (G2), and the lower part of the side surface is also provided with a raw water discharge pipe iii (G3); the raw water tank (1) is connected with a water inlet end of a pump i (2) through a pipe iv (G4), a return pipe vi (G6) is arranged on a pipe v (G5) connected with a water outlet end of the pump i (2), and a flowmeter i (3) and an electric regulating valve i (4) are arranged on the return pipe vi (G6); a water outlet pipe v (G5) of the pump i (2) is connected with a pipe vii (G7) and a pipe viii (G8) through a safety valve i (5), wherein the pipe vii (G7) is connected with a pipe ix (G9) through a control valve i (6), a pressure gauge i (11) and a flow meter ii (12), and is connected with a pipe xxi (G21) through a control valve iv (13) and a control valve vii (17); a pipe viii (G8) is connected with the water inlet end of a pretreatment filter i (8) through a control valve ii (7), the pretreatment filter i (8) is connected with a pretreatment filter ii (9) in series, the water outlet end of the pretreatment filter ii (9) is connected with a pressure gauge i (11) through a pipe x (G10) and through a control valve iii (10), and is connected with the water inlet end of a pretreatment ultrafiltration membrane module (15) through a flow meter ii (12) and through a control valve v (14) on a pipe xi (G11), the water outlet end of the pretreatment ultrafiltration membrane module (15) is connected with a pipe xii (G12) and enters a nanofiltration water storage tank (19) through a pipe xiii (G13); the tube xii (G12) and the tube xiii (G13) are respectively provided with a control valve vi (16) and a control valve viii (18); the lower part and the upper part of the side surface of the nanofiltration water storage tank (19) are respectively provided with a cooling reflux water inlet pipe xiv (G14) and a cooling reflux water outlet pipe xv (G15), and the lower part of the side surface is also provided with a raw water discharge pipe xvi (G16); the nanofiltration water storage tank (19) is connected with the water inlet end of a pump ii (20) through a pipe xvii (G17), a return pipe xix (G19) is arranged on a pipe xviii (G18) connected with the water outlet end of the pump ii (20), and a flow meter iii (21) and an electric control valve ii (22) are arranged on the return pipe xix (G19); the outlet pipe xviii (G18) of the pump ii (20) is connected to the pipe xx (G20) through the safety valve ii (23) and to the pipe xxi (G21) through the control valve ix (24); a pressure gauge ii (25), a flow meter iv (26) and an online detection sensor i (27) are arranged on the pipe xxi (G21) and are respectively connected with a pipe xxii (G22), a pipe xxiii (G23), a pipe xxiv (G24) and a pipe xxv (G25); the pipe xxii (G22) is connected with a microfiltration membrane component (32) to be tested through a control valve x (28); the pipe xxiii (G23) is connected with an ultrafiltration membrane component (33) to be tested through a control valve xi (29); the pipe xxiv (G24) is connected with a nanofiltration membrane component (34) to be tested through a control valve xii (30); the pipe xxv (G25) is connected with the submerged membrane tank (35) through a control valve xiii (31); the permeation water outlet ends of the microfiltration membrane component (32), the ultrafiltration membrane component (33) and the nanofiltration membrane component (34) to be tested are respectively connected with a pipe xxvi (G26), a pipe xxvii (G27) and a pipe xxviii (G28), and the three pipelines are respectively connected with a control valve xiv (36), a control valve xv (37) and a control valve xvi (38); the cross-flow water outlet ends of the microfiltration membrane component (32), the ultrafiltration membrane component (33) and the nanofiltration membrane component (34) to be tested are respectively connected with a pipe xxix (G29), a pipe xxx (G30) and a pipe xxxi (G31), and are respectively connected with a pipe xxxii (G32) through a control valve xvii (39), a control valve xviii (40) and a control valve xix (41); the pipe xxxii (G32) is connected with the pipe xxxiii (G33) and the pipe xxxiv (G34) after passing through a pressure gauge iii (42) and a flow sensor v (43), the pipe xxxiii (G33) is provided with an electric regulating valve iii (44), and the pipe xxxiv (G34) is provided with an electric regulating valve iv (45); the pipe xxxiv (G34) is connected with the pipe xxxv (G35) and the pipe xxxvi (G36), the pipe xxxv (G35) is provided with a control valve xx (46), and the pipe xxxvi (G36) is provided with a control valve xxi (47); the water outlet end of the immersed membrane pool (35) is connected with a pipe xxxvii (G37), and the pipe xxxvii (G37) is provided with a control valve xxii (48); an immersed membrane component (49) to be tested is arranged in the immersed membrane pool (35); the permeation water outlet end of the immersed membrane component (49) to be tested is sequentially connected with a pressure gauge iv (50), an electric regulating valve v (51) and a vacuum pump (52) through a pipe xxxviii (G38); a control valve xxiii (53) is arranged on a pipe xxxix (G39) behind the vacuum pump (52) and is respectively connected with the output ends of a pipe xxvi (G26), a pipe xxvii (G27) and a pipe xxviii (G28) and the input end of a pipe xl (G40); the tube xl (G40) is provided with a pressure gauge v (54), a flow meter vi (55) and an online detection sensor ii (56) and is connected with a tube xli (G41) and a tube xlii (G42), wherein the tube xli (G41) is connected with the tube xliv (G44) after passing through a control valve xxiv (57); a pipe xlii (G42) is connected with the water inlet end of a post-treatment filter (59) through a control valve xxv (58), the water outlet end of the post-treatment filter (59) is connected with a pipe xliii (G43), and a pipe xlii (G43) is connected with a pipe xliv (G44) through a control valve xxvi (60); the membrane voltage regulating power supply (61) is connected with the microfiltration membrane component (32), the ultrafiltration membrane component (33), the nanofiltration membrane component (34) and the submerged membrane component (49) to be tested through a lead i (W1) and a lead ii (W2) to provide voltage.

2. The integrated electrically-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform according to claim 1, wherein the pretreatment ultrafiltration membrane module (15) is a pretreatment component before filtration of the nanofiltration membrane to be tested.

3. The integrated electrically-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform according to claim 1, wherein the microfiltration membrane component (32), the ultrafiltration membrane component (33), the nanofiltration membrane component (34) and the submerged membrane tank (35) to be tested are detachable and replaceable components.

4. The integrated electrically-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform according to claim 1, wherein the microfiltration membrane component (32), the ultrafiltration membrane component (33), the nanofiltration membrane component (34) and the submerged membrane component (49) to be tested are electrically-assisted membrane filtration components and are connected with a membrane voltage regulation power supply through leads.

5. The integrated electrically-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform according to claim 1, wherein the preferred size range of the microfiltration membrane component (32) to be tested is 100-400 mm x 50-200 mm x 50-250 mm.

6. The integrated electrically-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform according to claim 1, wherein the preferred size range of the ultrafiltration membrane component (33) to be tested is 100-400 mm x 50-200 mm x 50-250 mm.

7. The integrated electrically-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform according to claim 1, wherein the preferred size range of the nanofiltration membrane module (34) to be tested is 100-400 mm x 50-200 mm x 50-250 mm.

8. The integrated electrically-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform according to claim 1, wherein the preferred size range of the submerged membrane module (49) to be tested is 100-400 mm x 50-300 mm x 50-150 mm.

9. The integrated electrically-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform according to claim 1, wherein the online detection sensor i (27) is a temperature sensor, a pH sensor, a conductivity sensor, a turbidity sensor, a COD sensor, an ammonia nitrogen sensor, a nitrite sensor and a nitrate sensor.

10. The integrated electrically-assisted microfiltration, ultrafiltration and nanofiltration membrane performance comprehensive test platform according to claim 1, wherein the online detection sensors ii (56) are temperature sensors, pH sensors, conductivity sensors, turbidity sensors, COD sensors, ammonia nitrogen sensors, nitrite sensors and nitrate sensors.