CN104062450B - A kind of method that in-situ monitoring membrane module pollutes - Google Patents
A kind of method that in-situ monitoring membrane module pollutes Download PDFInfo
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- CN104062450B CN104062450B CN201410317461.1A CN201410317461A CN104062450B CN 104062450 B CN104062450 B CN 104062450B CN 201410317461 A CN201410317461 A CN 201410317461A CN 104062450 B CN104062450 B CN 104062450B
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Abstract
The invention discloses a kind of method that in-situ monitoring membrane module pollutes, step: by conductivity meter electrode, first silver-silver chloride electrode and membrane module are arranged in filtering ponds, the water delivering orifice of membrane module is connected with the one end of the rising pipe being provided with the first threeway and the second threeway, the other end of rising pipe is connected with drawdown pump, first threeway is connected with the second silver-silver chloride electrode by perforated rubber stopper, second threeway is provided with pressure transducer, engineering machine respectively with pressure transducer, oscillograph and the electrical connection of conductivity meter electrode, oscillograph is electrically connected with the first silver-silver chloride electrode and the second silver-silver chloride electrode respectively, pass into water to be filtered to filtering ponds, start drawdown pump, make the membrane filtration flux of membrane module constant, measure the electrokinetic potential of membrane module, in real time transmembrane pressure, apparent Zeta potential is converted in engineering machine, by observing its change, monitoring membrane module pollutional condition.Method cost of the present invention is low, simple to operate, convenient management.
Description
Technical field
The present invention relates to a kind of in-situ monitoring technology, relate to a kind of method that in-situ monitoring membrane module pollutes particularly.
Technical background
Current membrane filtration technique has been widely used in potable water and wastewater treatment, and high with its filtration efficiency, and effluent quality is high, operational management is convenient, be subject to all circles' favorable comment, but the problem of fouling membrane also becomes a great problem of current water treatment by membrane, be considered to the principal element limiting film application.The method of present analysis monitoring fouling membrane mainly contains: 1. membrane flux monitoring, the water production rate mainly by monitoring the film unit interval assesses the situation of fouling membrane.This monitoring means is applied in the technique of constant pressure operation usually, but in conventional water treatment, for ensureing the hydraulic detention time of each operation stage, usually adopt the method for operation of constant flow, therefore this monitoring means can not be widely used in large-scale membrane filtration process; 2. transmembrane pressure monitoring, the pressure difference value mainly by measuring film both sides judges fouling membrane, is used in constant flow filtering technique more.But this method is only one method indirectly, can not monitor the situation of fouling membrane layer well, and the change of pressure is easily subject to the interference of other factors, as extruding or the breakage of membrane fiber; 3. ultrasonic monitoring, mainly by launching ultrasonic signal to membrane fiber, fouling membrane is monitored in the fluctuation according to feedback signal, but this monitoring means just simply determines the distribution of face cake layer, and other characteristics for cake layer can not embody well; 4. optical imagery monitoring, this method observes membrane fiber sedimentary deposit mainly through online three-dimensional imaging, research cake layer fine structure and cake layer thickness, but the method requires that equipment and instrument is accurate, and good waterproof performance, therefore cost is higher, can not apply widely.Therefore can find out the means of above monitoring fouling membrane or comparatively single, or monitoring equipment require complicated, in-situ monitoring can not be realized simultaneously.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method that in-situ monitoring membrane module pollutes is provided.
Technical scheme of the present invention is summarized as follows:
1) by conductivity meter electrode 13, first silver-silver chloride electrode 4 and membrane module 2 are arranged in filtering ponds 1, the water delivering orifice of membrane module is connected with the one end of the rising pipe 18 being provided with the first threeway 7 and the second threeway 10, the other end of rising pipe is connected with drawdown pump, first threeway is connected with the second silver-silver chloride electrode 5 by perforated rubber stopper 6, second threeway is provided with pressure transducer 9, engineering machine 11 respectively with pressure transducer, oscillograph 8 and the electrical connection of conductivity meter electrode, oscillograph is electrically connected with the first silver-silver chloride electrode and the second silver-silver chloride electrode respectively,
2) water to be filtered is passed into filtering ponds 1, water logging to be filtered is made not have conductivity meter electrode, the first silver-silver chloride electrode and membrane module, start drawdown pump, make the membrane filtration flux of membrane module constant, the electrokinetic potential of membrane module is measured by the first silver-silver chloride electrode and the second silver-silver chloride electrode, real-time transmembrane pressure is measured by pressure transducer, apparent Zeta potential is converted to by Helmoltz – Schmolukovski formula in engineering machine, by observing the apparent zeta current potential of membrane module with the change with filtration time, the pollutional condition of monitoring membrane module.
First silver-silver chloride electrode 4 is preferably 2-3cm with the distance of membrane module 2.
The length of the rising pipe of junctional membrane assembly water delivering orifice 19 and the second silver-silver chloride electrode 5 is 3-5cm.
Advantage of the present invention: method testing cost of the present invention is low, can be widely used in the monitoring that in coagulation membrane filtration process and conventional sanitary sewage disposal MBR technique, membrane module pollutes.This technology is simple to operate except having, outside the advantages such as convenient management, its principal feature is can Real-Time Monitoring and in-situ monitoring, the accumulation of membrane module surface colloidal solid and inorganic salts can be reflected, be convenient to the polluting property that operational management personnel understand membrane module in time, and foundation can be provided for the selection of medicament when membrance chemistry cleans.
Accompanying drawing explanation
Fig. 1 is the three-dimensional exploded view of device of the present invention.
Fig. 2 is that the apparent Zeta potential of film and transmembrane pressure are schemed over time in whole service process.
Embodiment
Below in conjunction with Figure of description and embodiment, the present invention is further illustrated.
Embodiment 1
The method that in-situ monitoring membrane module pollutes, comprises the steps:
1) by conductivity meter electrode 13, first silver-silver chloride electrode 4 and membrane module 2 are arranged in filtering ponds 1, conductivity meter electrode 13 is arranged on the inside surface of filtering ponds 1 sidewall by the first fixed mount 12, first silver-silver chloride electrode 4 is arranged on the inside surface of filtering ponds 1 sidewall by the second fixed mount 3, membrane module 2 is arranged on the inside surface of filtering ponds 1 sidewall by the 3rd fixed mount 14, the water delivering orifice of membrane module is connected with the one end of the rising pipe 18 being provided with the first threeway 7 and the second threeway 10, the other end of rising pipe is connected with drawdown pump, first threeway is connected with the second silver-silver chloride electrode 5 by perforated rubber stopper 6, second threeway is provided with pressure transducer 9, engineering machine 11 respectively with pressure transducer, oscillograph 8 and the electrical connection of conductivity meter electrode, oscillograph is electrically connected with the first silver-silver chloride electrode and the second silver-silver chloride electrode respectively,
2) water to be filtered (surface water or sewage) is passed into filtering ponds 1, water logging to be filtered is made not have conductivity meter electrode, first silver-silver chloride electrode and membrane module, start drawdown pump, make the membrane filtration flux of membrane module constant, the electrokinetic potential of membrane module is measured by the first silver-silver chloride electrode and the second silver-silver chloride electrode, real-time transmembrane pressure is measured by pressure transducer, apparent Zeta potential is converted to by Helmoltz – Schmolukovski formula in engineering machine, by observing the apparent zeta current potential of membrane module with the change with filtration time, the pollutional condition of monitoring membrane module.
In overall operation process, the change of the transmembrane pressure of membrane module should between 5-100kPa, and the first silver-silver chloride electrode 4 is any number of 2-3cm with the distance of membrane module 2.The length of the rising pipe of junctional membrane assembly water delivering orifice 19 and the second silver-silver chloride electrode 5 is any number of 3-5cm.Electrical conductivity of water to be filtered should be any number between 10-2000 μm/cm, conductivity hourly variation factor 1.2.
In implementation process, want attentional manipulation membrane module constant flow to run.Do not place high-power electric appliance in surrounding them 1.5m, prevent the interference of electromagnetic signal.Electro-magnetic shielding cover need be placed on electrode when there is inevitable electromagnetic signal, thus avoid interference the precision of measurement.
Embodiment 2:
The method that in-situ monitoring membrane module pollutes, comprises the steps:
1) with embodiment 1 step 1); Wherein, membrane module useful area is 0.02m
2, 0.1 μm, membrane fiber aperture, the apparent Zeta potential of new membrane module is-5.8mV, and clear water flux is 200 ± 12L/ (m
2hbar); First silver-silver chloride electrode (4) is 3cm with the distance of membrane module (2), junctional membrane assembly water delivering orifice (19) is 5cm with the length of the rising pipe of the second silver-silver chloride electrode (5), the precision of silver-silver chloride electrode is 0.3mV, measuring error 1%; Pressure transducer precision is 0.01KPa, measuring error 1%; Oscillographic frequency acquisition is 50Hz, and precision is 0.001mV, measuring error 0.1%.
2) water to be filtered (Tianjin surface water is passed into filtering ponds, electrical conductivity of water to be filtered is 255 μ s/cm, conductivity hourly variation factor 1.2, Zeta potential is-23.8mV), water to be filtered is made to lead to submergence conductivity meter electrode, the first silver-silver chloride electrode and membrane module, start drawdown pump, the electrokinetic potential of membrane module is measured by the first silver-silver chloride electrode and the second silver-silver chloride electrode, measure transmembrane pressure by pressure transducer, in engineering machine, convert apparent Zeta potential to by Helmoltz – Schmolukovski formula.By observing the change of apparent zeta current potential with filtration time of membrane module, the pollutional condition of monitoring membrane module.See Fig. 2.
Wherein, membrane module operating flux is stabilized in 10L/ (m
2h), under this constant flux, transmembrane pressure is 5.2kPa.Overall process continuous service 720min, when end of run, transmembrane pressure reaches 62kPa.The situation of change of membrane module pollution can be observed directly in the process by computing machine.
Fouling membrane supervision and analysis.Fig. 2 is that the apparent Zeta potential of film and transmembrane pressure are schemed over time in whole service process.As shown in Figure 2: at the filtration stage initial stage, the increasing degree of film apparent Zeta potential absolute value is little, this is consistent with the change of transmembrane pressure, along with the carrying out of filtering, transmembrane pressure gathers way and increases gradually, meanwhile, the also corresponding increase that gathers way of the apparent Zeta potential of film, this is because charged colloidal particle is in the accumulation of cake layer, cause the increase of negative potential, phase after filtration, transmembrane pressure continues to increase, and the apparent Zeta potential of film keeps constant, this is the repulsive interaction that the cake layer formed due to colloidal material charged in a large number accumulation produces solution colloidal material, the continuation of the apparent Zeta potential of film is inhibit to increase.This observations proves that the apparent Zeta potential of film and fouling membrane state have good consistance.Monitoring method of the present invention and monitoring equipment provide a kind of quantification means newly by for the monitoring of fouling membrane and the research of Membrane cleaning.
The apparent Zeta potential of membrane module is more close to the Zeta potential of water to be filtered, and at film surface deposition of pollutant in solution are described more, and resistance of membrane filtration is higher, and fouling membrane is more serious.
Claims (1)
1. a method for in-situ monitoring membrane module pollution, is characterized in that comprising the steps:
1) by conductivity meter electrode (13), first silver-silver chloride electrode (4) and membrane module (2) are arranged in filtering ponds (1), the water delivering orifice of membrane module is connected with the one end of the rising pipe (18) being provided with the first threeway (7) and the second threeway (10), the other end of rising pipe is connected with drawdown pump, first threeway is connected with the second silver-silver chloride electrode (5) by perforated rubber stopper (6), second threeway is provided with pressure transducer (9), engineering machine (11) respectively with pressure transducer, oscillograph (8) and the electrical connection of conductivity meter electrode, oscillograph is electrically connected with the first silver-silver chloride electrode and the second silver-silver chloride electrode respectively,
2) water to be filtered is passed into filtering ponds (1), water logging to be filtered is made not have conductivity meter electrode, first silver-silver chloride electrode and membrane module, start drawdown pump, make the membrane filtration flux of membrane module constant, the electrokinetic potential of membrane module is measured by the first silver-silver chloride electrode and the second silver-silver chloride electrode, real-time transmembrane pressure is measured by pressure transducer, apparent Zeta potential is converted to by Helmoltz – Schmolukovski formula in engineering machine, by observing the change of apparent zeta current potential with filtration time of membrane module, the pollutional condition of monitoring membrane module, first silver-silver chloride electrode (4) is 2-3cm with the distance of membrane module (2), junctional membrane assembly water delivering orifice (19) is 3-5cm with the length of the rising pipe of the second silver-silver chloride electrode (5).
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| CN107328699B (en) * | 2017-06-30 | 2019-09-20 | 天津工业大学 | Based on In situ spectroscopic-electrochemical analysis techniques fouling membrane monitoring device and method |
| CN114713035B (en) * | 2022-03-31 | 2023-05-05 | 中国科学院过程工程研究所 | Continuous filtration process monitoring device and method for filtration membrane |
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| US6699684B2 (en) * | 2002-07-23 | 2004-03-02 | Nalco Company | Method of monitoring biofouling in membrane separation systems |
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| CN101944275A (en) * | 2010-08-26 | 2011-01-12 | 天津市环境保护科学研究院 | Membrane pollution diagnosis and early warning decision making system of hollow fiber device |
| CN203079736U (en) * | 2013-01-22 | 2013-07-24 | 北京城市排水集团有限责任公司 | MBR (Membrane Bio-Reactor) film pollution early-warning system |
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