CN1724411A - Process for on-line controlling film pollution development by altrasonic wave - Google Patents
Process for on-line controlling film pollution development by altrasonic wave Download PDFInfo
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- CN1724411A CN1724411A CNA2005100117995A CN200510011799A CN1724411A CN 1724411 A CN1724411 A CN 1724411A CN A2005100117995 A CNA2005100117995 A CN A2005100117995A CN 200510011799 A CN200510011799 A CN 200510011799A CN 1724411 A CN1724411 A CN 1724411A
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Abstract
An ultrasonic method for in-line control to the pollution of membrane features that in the condition of particular ultrasonic frequency and energy density, an 'Order increment method of ultrasonic working time' is used to optimize the ultrasonic working time and the cross flow speed on the membrane surface in order to minimize to total systematic energy consumption, and under the predefined cross flow speed, the ultrasonic working time is optimized to make the membrane resistant constant.
Description
Technical field
The present invention relates to film-bio-reactor, particularly the On-Line Control Method of film pollution belongs to the wastewater treatment and reuse technical field.
Background technology
(Membrane Bioreactor MBR) is a kind of new and effective wastewater treatment and reuse technology with membrane separation technique and the combination of traditional biological treatment technology to film-bio-reactor.The basic factor of restriction film one biological reactor large-scale application is a membrane pollution problem at present.Film pollutes and is meant in membrane filtration processes, solute molecule, colloidal particle and particulate matter are on the film surface or the absorption or the deposition of fenestra inside in the separated feed liquid, cause the fenestra road to diminish or stop up, the film surface forms gel coat or cake layer, cause continuous reduction of membrane flux or film both sides driving pressure constantly to raise, directly cause water production rate to reduce, working cost improves.
The influence factor that film pollutes generally speaking comprises three aspects, i.e. the hydraulics of the character of the character of mould material, active sludge intermixture and MBR work.
The mould material character that influences the film pollution mainly comprises charge property, film surfaceness and the hydrophilic and hydrophobic etc. on the material of film, pore size, porosity, film surface.
Mixed solution (feed liquid) character comprises SMP, EPS in size distribution, viscosity of mixed liquid and the mixed solution of sludge concentration, mixed solution and molecule concentration etc.In film one biological reactor, cause film to pollute and mainly contain two big class materials.One class is macromolecular substance, the dissolved matter (as microbial metabolites SMP) in the solution, and this class material can be adsorbed to the film surface and form gel coat, perhaps enters fenestra inside and causes fenestra to stop up, and belongs to irreversible pollution.Another kind of material is granular material, along with the carrying out of membrane sepn process, this class material can form cake layer at the film surface deposition, is polluted in the total-resistance at film by the resistance of membrane filtration of its generation and occupies larger proportion, but this pollution generally is a reversible, is called reversible pollution.Development how to adopt effective means to control reversible pollution is that biological the sending out of film answered the key that controlling diaphragm pollutes in the device.
The hydrodynamic condition on film surface is to influence the important factor that film pollutes in the MBR operational process.Hydraulics is determined by two aspect factors, is the inherent structure form of membrane module on the one hand, can directly influence the feed liquid fluidised form on film surface, thereby influence resistance to crocking and the throughput of MBR; Be the operation condition of MBR on the other hand, comprise initial film flux, working pressure and flow-shape etc.In the operational process of MBR, selecting suitable flow-shape to make the film surfactant fluid be in turbulence state is the effective means that controlling diaphragm pollutes.For traditional separate film-bio-reactor, the cross-flow velocity that improves the film surface is the main means that obtain the turbulent flow hydraulics.
The needs oxygen supply according to whether, film-bio-reactor can be divided into aerobic film-bio-reactor and anaerobism film-bio-reactor.According to the position of membrane module, film-bioreactor can be divided into separate film-bio-reactor and integral type film-bio-reactor.
For traditional separate film-bio-reactor, the malleation that its water outlet relies on recycle pump to provide is used as the driving pressure of membrane filtration processes.Separate film-bio-reactor has that flux is big, film cleans advantage easily.But, for controlling diaphragm effectively pollutes, often needing bigger crossflow velocity, the flow and the lift of used recycle pump are bigger, energy consumption also big (be integral type film biological reactor 4～6 times).
Traditional integral type film biological reactor generally is aerobic film one biological reactor.Its membrane module generally adopts curtain type membrane, utilizes gas to put forward principle, forms an air water two-phase flow and flows district's circulation in the up-flow district with falling, and the film surface is washed away, and controlling diaphragm pollutes.Its effluent adopting suction pump aspiration vacuum is as the driving pressure of membrane filtration processes.The major advantage of integral type film-bio-reactor is that energy consumption is relative to low than separated type, and land used is economized, but its film cleans inconvenience, and it is higher that film cleans cost, and membrane flux is also less relatively.And the needed oxygen of aerobic microbiological metabolism only accounts for the sub-fraction of total air demand, and air feed is mainly used in gas and carries suspension in the whole reactor, and how reducing its energy consumption still is one of research direction.
At the membrane pollution problem of film-bio-reactor, seek new film and pollute control device, under the prerequisite that does not improve system energy consumption, realize that operation steady in a long-term is the emphasis of film-bio-reactor research.And, seek that film pollutes on-line Control and polluted membrane on-line cleaning technology is the trend that film pollutes Control Study based on the consideration of convenient operation and management.
For applications of ultrasound in membrane filtration processes, promptly carried out correlative study in the eighties of last century the nineties abroad.Kost etc. 1988 to the method application of using ultrasonic raising membrane permeation flux United States Patent (USP) (US Patent No.4,7802,212), Shimichi etc. have studied applications of ultrasound in the raising effect of ion exchange process to flux in nineteen ninety-five, and applied for Japanese Patent (Japan Patent No.07,31974).Ultrasonic technique is applied to film one biological reactor, can effectively improves permeation flux, the development that controlling diaphragm pollutes simultaneously ultrasonicly can effectively improve the film cleaning performance.For film cross flow filter process, owing to the concentration polarization phenomenon that causes through flow is the prerequisite that film pollutes development, ultrasonic energy is in the solid-liquid frictional belt on film surface, produce the microturbulence phenomenon, play good mixing stirring action, the development of control concentration polarization, thereby the effectively development of controlling diaphragm pollution; Along with the passing of filtration time, after film polluted and takes place, ultrasonic mechanical vibration that produce and sound cavitation effect etc. helped film to pollute, especially the removal of the reversible pollution of cake layer formation.
State's Neihuang County's rosy clouds, the research of Chen Futai etc. applications of ultrasound in integrative aerobic film-bio-reactor (application number: 200410009684.8), in membrane filtration processes, utilize transmembrane pressure TMP as controlling index, to a certain degree open ultrasonicly when TMP rises to, film polluted carry out on-line cleaning by robot.
For the membrane pollution problem of film-bio-reactor, aforesaid method can be realized ultransonic on-line cleaning, but film pollute develop into to a certain degree after, the effect of ultrasonic cleaning is undesirable, can not effectively remove pollution, does not reach the effect of common off-line matting; Simultaneously Vltrasonic device is located at bio-reactor inside, can causes system's operating temperature to raise,, therefore limited the power and the time span of ultrasonic unlatching because ultransonic whole energy finally all will all be converted into heat and be absorbed by mud mixed liquid.
Summary of the invention
The purpose of this invention is to provide a kind of method of in film-bio-reactor, utilizing ultrasonic on-line Control film to pollute development, be implemented under the lower film surface cross-flow velocity, the on-line Control film pollutes development effectively, keep film-bio-reactor long-time steady operation, further reduce operation energy consumption.
The objective of the invention is to be achieved through the following technical solutions:
A kind of method of utilizing film pollution development in ultrasonic on-line Control film-bio-reactor is characterized in that this method comprises the steps:
1) ultrasonic transducer adopts linear array and is arranged at the membrane module outside portion, and ultrasonic frequency is 20～50kHz; Ultrasonic energy density is 0.025～10W/cm
2
2) adopt time stepwise incremental method complex optimum film surface cross-flow velocity and ultransonic switching time pattern, its concrete optimizing process is as follows:
A, under the reactor normal operation, selected one group of cross-flow velocity;
B, under each cross-flow velocity, at first do not drive ultrasonic operation film-bio-reactor, make resistance of membrane filtration reach 1.5Rm～3.0Rm, open the T1 time with ultrasonic then, close mode operation film-bio-reactor of T2 time; Described T1 is the ultrasonic opening time, and initial value is T1=1～5min; Described T2 is the ultrasonic turn-off time, and initial value is T2=0.5～4h; Described Rm is pure membrane resistance, can determine with the velocity of variation of membrane flux by measuring TMP under the clear water condition;
C, in one day working time, reach 0.25Rm～1Rm as the rising of resistance of membrane filtration, then select time increment Delta T (Δ T=1～10min),, close mode operation film-bio-reactor of T2 time to open the T1+ Δ T time; So increase in service until at one day of ultrasonic opening time repeatedly, the rising of resistance of membrane filtration is less than 0.25Rm～1Rm, and till also not reducing, the T1 of this moment and T2 are exactly the ultrasonic switch time after optimizing;
D, increase to 30min when T1 numerical value, resistance of membrane filtration rises and still surpasses 0.25Rm～1Rm, and then selecting T1 is 30min, and reduces T2; Be decreased to the 30min resistance of membrane filtration as T2 and still surpass 0.25Rm～1Rm, then under this cross-flow velocity, the development that can not utilize ultrasonic effective controlling diaphragm to pollute needs to improve cross-flow velocity;
E, each cross-flow velocity is optimized according to above-mentioned steps, obtain the corresponding ultrasonic switch time, calculate recycle pump energy consumption and ultrasonic device energy consumption under each cross-flow velocity according to optimum result, minimum with total energy consumption at last is that principle is determined rational cross-flow velocity and corresponding ultrasonic opening time membrane type.
On the basis of such scheme, when resistance of membrane filtration rises when reaching 4Rm～6Rm, the halt system water outlet is adopted and is opened ultrasonic 5～30min, closes mode operation 2～4h of ultrasonic same time, to remove the film surface contamination layer.
Technical characterictic of the present invention also is: when described bio-reactor adopted separate film-bio-reactor, the cross-flow velocity that its complex optimum obtains was 0.25～0.75m/s; The corresponding ultrasonic opening time is 1～20min; The ultrasonic turn-off time is 30～120min.
The present invention compared with prior art has the following advantages and the high-lighting effect: the present invention proposes directly to utilize the development of ultrasonic on-line Control film pollution, just directly film is polluted control within the specific limits, does not allow it to further develop; Proposition is arranged at the bio-reactor outside to membrane module, to solve the restriction to ultrasonic energy intensity; The present invention is that embodiment has done systematic study with separated type anaerobism film-bio-reactor, with the membrane filtration total-resistance is measurement index, with complex optimum cross-flow velocity and ultrasonic opening time be core strategy, the complete film groundwater pollution control of one cover has been proposed, be implemented under the lower film surface cross-flow velocity, the on-line Control film pollutes development effectively, keeps film-bio-reactor long-time steady operation, further reduces operation energy consumption.
For anaerobism film-bio-reactor, when reactor mixed solution sludge concentration is 3～15g/L, membrane flux is 24L.m
2.h
-1, ultrasonic frequency is 25～45kHz, ultrasonic energy density is 0.04～2W/cm
2The time, the face cross-flow velocity after the optimization is 0.5～0.75m/s; The time-optimized result of ultrasonication is for opening 3～15min in the cycle of 1h; The control effect of this moment film being polluted can reach and not have under the ultrasonication, and when relying on waterpower control separately, film surface cross-flow velocity is the pollution control effect of 1～2m/s.Under the ultrasonic sound field effect, what the membrane filtration total-resistance can the long period maintains in 2Rm～6Rm scope, and film-bio-reactor can prolong more than four times total working time.Anaerobism film-bioreactor system total energy consumption can be reduced to that not add ultrasonic, cross-flow velocity be 50～75% under 1～2m/s condition.
Description of drawings
Fig. 1 is that the present invention is used for the device synoptic diagram that separated type anaerobism film-bio-reactor utilizes ultrasonic controlling diaphragm pollution development.
Among the figure: 1-anaerobic biological reactor; 2-circulating water inlet; 3-recycle pump; 4-membrane module; 5-circulating water outlet pipe; 6-filter out water pipe; 7-ultrasonic transducer; 8-ultra-sonic generator.
Embodiment
The present invention proposes a kind of method of utilizing ultrasonic on-line Control film to pollute development, and technical essential mainly comprises ultrasonic transducer arrangement form, ultrasonic frequency, ultrasonic energy density and the ultrasonic control method that is adopted.
Described ultrasonic transducer arrangement form adopts linear array, is arranged at the membrane module outside portion.Described ultrasonic frequency is 20～50kHz; Described ultrasonic energy density is 0.025～10W/cm
2Studies show that the control effect that film is polluted weakens along with the raising of ultrasonic frequency.For energy density, then along with the raising of energy density, film pollutes the control effect to be strengthened, and simultaneously along with the increase of energy density, ultrasonic the microorganism active of biological treatment system and the damage of mould material itself is also increased, and the energy consumption of system also increases.The invention is characterized in rationally to have provided ultrasonic frequency 20～50kHz, and ultrasonic energy density range 0.025～10W/cm
2
Described ultrasonic control method mainly be meant complex optimum film surface cross-flow velocity and ultransonic switching time pattern, can adopt time stepwise incremental method to determine.This method is optimized ultrasonic opening time pattern at different cross-flow velocities, calculate recycle pump energy consumption (depending on cross-flow velocity) and ultrasonic device energy consumption (depending on ultrasonic time and the energy density opened) under each cross-flow velocity according to optimum result, determine cross-flow velocity and corresponding ultrasonic opening time pattern with the Schwellenwert of total energy consumption at last.
The development that utilizes ultrasonic on-line Control film to pollute, raising cross-flow velocity and prolongation ultrasonication time can be realized the effective control to the film pollution.Ultrasonic opening time prolongs, can more effective raising membrane flux, and the development that controlling diaphragm pollutes, but also mean the operation energy consumption that the raising system is total simultaneously.Otherwise the ultrasonic opening time is too short, then can't be implemented in to pollute under the prerequisite of development by controlling diaphragm, effectively reduces film surface cross-flow velocity, thereby cuts down the consumption of energy.Film surface cross-flow velocity, ultrasonic opening time pattern comprehensively are optimized, can effectively realize the reduction of system's total energy consumption.
The present invention proposes the complex optimum cross-flow velocity and the ultrasonication time is reduced total energy consumption with realization, guarantees system stable operation simultaneously.The core concept of time stepwise incremental method is under given cross-flow velocity, searches out a rational ultrasonic opening time pattern, is implemented in the opening time to cut down down the increment that the turn-off time inner membrance pollutes.The rising degree of resistance of membrane filtration depends on the mud mixed liquid character (sludge concentration, mud mixed liquid viscosity etc.) of film-bioreactor system and the hydraulics (mainly being the cross-flow velocity on film surface) on film surface in ultrasonic cycle turn-off time; Reduction degree to resistance of membrane filtration in ultrasonic cycle opening time depends on ultransonic energy density, the sludge concentration and the cross-flow velocity of ultrasonic opening time length and system.
Therefore,, can select one group of cross-flow velocity,, adopt time stepwise incremental method to optimize the ultrasonication time then to each cross-flow velocity for given film-bioreactor system.Concrete ultrasonic time pattern optimization method is as follows:
At first selected ultrasonic opening time initial value T1, turn-off time initial value T2.General T1 initial value can be selected 1～5min, and T2 can select 0.5～4h, recommends 0.5～2h.Under selected operational condition, do not drive ultrasonic operation film-bio-reactor, make resistance of membrane filtration reach 1.5Rm～3.0Rm (Rm is pure membrane resistance, can determine with the velocity of variation of flux by measuring TMP) under the clear water condition.Open the T1 time with ultrasonic then, close mode operation film-bio-reactor of T2 time, the development that the on-line Control film pollutes.In one day working time, rising as resistance of membrane filtration reaches 0.25Rm～1Rm, illustrates that then the ultrasonic opening time is not enough, can select time increment Δ T (generally can select 2min), to open the T1+ Δ T time, close mode operation film-bio-reactor of T2 time.So increase repeatedly ultrasonic open the time until the rising of resistance of membrane filtration in one day working time less than 0.25Rm～1Rm, till also not reducing, the T1 of this moment and T2 are exactly the ultrasonic switch time after optimizing.Because the ultrasonic opening time once is unsuitable long, if in the optimizing process, T1 numerical value surpasses 30min, and the rising of resistance of membrane filtration still surpasses selected scope, and then can select T1 is 30min, then reduces T2, and the process that reduces of T2 and the increase process of T1 are similar.Be reduced to 30min as T2, resistance of membrane filtration still has obvious increase, then illustrates under this cross-flow velocity, and the development that ultrasonic effectively controlling diaphragm pollutes needs to improve cross-flow velocity.
Ultrasonic control strategy operation film-bio-reactor with above-mentioned optimization, prolongation along with working time, membrane filtration total-resistance meeting continues slowly to rise, having served as filtration resistance power rises when reaching 4Rm～6Rm, can consider to prolong the ultrasonication time in a short time, shorten the ultrasonic turn-off time to remove the film surface contamination layer.Concrete grammar is that system stops water outlet, adopts and opens ultrasonic 5～30min, closes mode operation 2～4h of ultrasonic same time.
For the film-bio-reactor that uses organic film material; ultrasonic opening time pattern also relates to the protection to mould material; under ultransonic long term, can cause the damage of mould material, the present invention proposes by realize the protection to mould material at the certain thickness pollution layer of film surface reservation.This pollution layer thickness limits within the specific limits by keeping total filtration resistance.The invention is characterized in the limited field that has provided the membrane filtration total-resistance, promptly lower limit is at 1.5Rm～3.0Rm, and the upper limit is in 4Rm～6Rm scope.Usually, polluted membrane two big class materials are arranged: a class is deliquescent macromolecular substance, as solvability microbial metabolites (Soluble Microbial Products, be called for short SMP) and extracellular polymeric (Extracelluar Polymers is called for short ECP), along with the carrying out of membrane sepn, this class material can be adsorbed to the film surface and form gel coat (Gel Layer), it generally is irreversible polluting, but development is comparatively slow, is called irreversible pollution (Irreversible Fouling).Another kind of material is a particulate matter, as the mud flco, this class material forms sludge blanket (Cake Layer) at the film surface deposition, pollution is a reversible, be called reversible pollution (Reversible Fouling), this class is polluted and occupy very big deal (more than 80%) in dead-end filtration, and development rapidly.Of the present invention mainly is to keep gel coat and a part of cake layer at the certain thickness pollution layer of film surface reservation, and the major part of cake layer is to utilize the main object of ultrasonic removal.
Embodiment 1
The method of utilizing ultrasonic on-line Control film to pollute that the present invention proposes can be used for anaerobism film-bio-reactor, also can be used for aerobic film-bio-reactor.Be that embodiment does detailed explanation with anaerobism separate film-bio-reactor below.
Fig. 1 is used for the process flow diagram of separated type anaerobism film-bio-reactor for the present invention.Anaerobism film-bioreactor system is by anaerobic biological reactor 1, circulating water inlet 2, and recycle pump 3, membrane module 4, circulating water outlet pipe 5 filters out water pipe 6, ultrasonic transducer 7, ultra-sonic generator 8 is formed.Ultrasonic transducer 7 is arranged at the outside portion of membrane module, forms ultrasonic sound field and pollute development with controlling diaphragm in membrane module.Flow out from reactor 1 bottom through the sewage after the anaerobic biological reactor processing, through circulating water inlet 2, pump into membrane module 4 by recycle pump 3, send reactor top back to through circulating water outlet pipe 5 then and finish the feed liquid circulation, film permeate water rising pipe 6 is after filtration discharged.
In the present embodiment, reactor mixed solution sludge concentration is 3～15g/L, and membrane flux is 24L.m
2.h
-1In ultrasonic frequency is 25～45kHz, and ultrasonic energy density is 0.04～2W/cm
2In the scope cross-flow velocity and ultrasonic opening time have been carried out complex optimum.Film surface cross-flow velocity has been selected 0.25m/s, 0.5m/s, 0.75m/s and 1.0m/s.For each cross-flow velocity, move film-bio-reactor not opening under the ultransonic condition, after resistance reaches 2.0Rm, with 1h is ultrasonication cycle (ultrasonic time and the turn-off time summation opened), the ultrasonic time initial value T1 that opens selects 1min, time increment is selected 2min, utilizes the described method of technical scheme that the ultrasonic switch temporal mode is optimized.
Operation result shows, for the cross-flow velocity of 0.25m/s, reaches 30min when the ultrasonic time of opening, and the turn-off time is under the condition of 45min, still the development of controlling diaphragm pollution effectively; For the cross-flow velocity of 0.5m/s and 0.75m/s, the ultrasonication time according to the method described above optimum result in the cycle of 1h, opening 3～15min; Cross-flow velocity for 1.0m/s, anaerobism film-the bioreactor system of this test at the ultrasonic 1min of opening, close steady running in the test period that can be implemented in a week under the temporal mode of 59min, but because the energy consumption of recycle pump makes that more greatly system's total energy consumption is bigger.
Therefore, for anaerobism film-bioreactor system that present embodiment relates to, the result of complex optimum cross-flow velocity and ultrasonic opening time pattern adopts 0.5～0.75m/s for cross-flow velocity; The ultrasonication time is for to open 3～15min in the cycle of 1h.The control effect of this moment film being polluted can reach and not have under the ultrasonication, and the method crossflow velocity that relies on waterpower control separately is the pollution control effect of 1.0～2m/s.Under the ultrasonic sound field effect, what the membrane filtration total-resistance can the long period maintains in 2Rm～6Rm scope, and film-bio-reactor can prolong more than four times total working time at least.Corresponding anaerobism film-bioreactor system total energy consumption can be reduced to and not add ultrasonicly, and cross-flow velocity is 50～75% under 1～2m/s condition.
Claims (3)
1. a method of utilizing film pollution development in ultrasonic on-line Control film-bio-reactor is characterized in that this method comprises the steps:
1) ultrasonic transducer adopts linear array and is arranged at the membrane module outside portion, and its ultrasonic frequency is 20～50kHz; Ultrasonic energy density is 0.025～10W/cm
2
2) adopt time stepwise incremental method complex optimum film surface cross-flow velocity and ultransonic switching time pattern, its concrete optimizing process is as follows:
A, under the reactor normal operation, selected one group of cross-flow velocity;
B, under each cross-flow velocity, at first do not drive ultrasonic operation film-bio-reactor, make resistance of membrane filtration reach 1.5Rm～3.0Rm, open the T1 time with ultrasonic then, close mode operation film-bio-reactor of T2 time; Described T1 is the ultrasonic opening time, and initial value is T1=1～5min; Described T2 is the ultrasonic turn-off time, and initial value is T2=0.5～4h;
C, in one day working time, reach 0.25Rm～1Rm as the rising of resistance of membrane filtration, then select time increment Delta T=1～10min to open the T1+ Δ T time, closes mode operation film-bio-reactor of T2 time; So increase in service until at one day of ultrasonic opening time repeatedly, the rising of resistance of membrane filtration is less than 0.25Rm～1Rm, and till also not reducing, the T1 of this moment and T2 are exactly the ultrasonic switch time after optimizing;
D, increase to 30min when T1 numerical value, resistance of membrane filtration rises and still surpasses 0.25Rm～1Rm, and then selecting T1 is 30min, and reduces T2; Be decreased to the 30min resistance of membrane filtration as T2 and still surpass 0.25Rm～1Rm, then under this cross-flow velocity, the development that can not utilize ultrasonic effective controlling diaphragm to pollute needs to improve cross-flow velocity;
E, each cross-flow velocity is optimized according to above-mentioned steps, obtain the corresponding ultrasonic switch time, calculate recycle pump energy consumption and ultrasonic device energy consumption under each cross-flow velocity according to optimum result, minimum with total energy consumption at last is that principle is determined rational cross-flow velocity and corresponding ultrasonic opening time membrane type.
2. in accordance with the method for claim 1, it is characterized in that: when resistance of membrane filtration rises when reaching 4Rm～6Rm, the halt system water outlet is adopted and is opened ultrasonic 5～30min, closes mode operation 2～4h of ultrasonic same time, to remove the film surface contamination layer.
3, in accordance with the method for claim 1, it is characterized in that: when described membrane bioreactor adopted separate film-bio-reactor, the cross-flow velocity that its complex optimum obtains was 0.25～0.75m/s; The corresponding ultrasonic opening time is 1～20min; The ultrasonic turn-off time is 30～120min.
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| US8506812B2 (en) | 2007-03-23 | 2013-08-13 | Institute Of Process Engineering, Chinese Academy Of Sciences | Method, equipment and specific drawer for membrane separation utilizing concentration polarization |
| CN102218268A (en) * | 2011-05-10 | 2011-10-19 | 北京林业大学 | Combination frequency ultrasonic online fluidized bed membrane bioreactor membrane pollution control device and method |
| CN105688679A (en) * | 2016-02-26 | 2016-06-22 | 苏州立升净水科技有限公司 | Movable type ultrasonic cleaning device for immersed membrane system |
| CN108562635A (en) * | 2018-01-08 | 2018-09-21 | 天津工业大学 | A kind of fouling membrane in-situ monitoring device based on Zeta potential and Electrical Impedance Spectroscopy technology |
| CN111342100A (en) * | 2020-03-09 | 2020-06-26 | 广州市环境保护工程设计院有限公司 | Microbial fuel cell system |
| CN111342100B (en) * | 2020-03-09 | 2023-01-24 | 广州市环境保护工程设计院有限公司 | Microbial fuel cell system |
| CN114377550A (en) * | 2022-01-18 | 2022-04-22 | 深圳汇芯生物医疗科技有限公司 | Filtering equipment |
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