CN101811757A - Air-assisted electro-coagulation algae water separation device and using method thereof - Google Patents
Air-assisted electro-coagulation algae water separation device and using method thereof Download PDFInfo
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Abstract
The invention discloses an air-assisted electro-coagulation algae water separation device and a using method thereof, and belongs to the technical field of sewage treatment. The device comprises a tower, a main shaft, concentric cylinder electrode plates, a mechanical transmission device, a connecting rod mechanism, a floating ball device, an air distributor, a pulse air feeding device and the like. The device takes even pairs of concentric cylinders as cathode and anode for electro-coagulation which are distributed in a staggering way; the surface area of the electrode plate is large, the electro-coagulation efficiency is high, and the adsorption precipitation of microalgae on the surface of the electrode can be effectively prevented. The flowing direction of the liquid in the tower is opposite to the settlement direction of the microalgae so as to form cross flow to enhance the mass transfer and improve the electro-coagulation efficiency. The floating ball device can keep the moving components such as the main shaft in the tower, the concentric cylindrical electrode plates of the cathode and anode and the like in a floating state so as to reduce the running load of a transmission motor. The device of the invention can realize continuous operation of electro-coagulation and air floatation collection of the microalgae; and the basic structure is easy to amplify and implement so as to meet the requirements of large-scale industrial continuous running.
Description
Technical field
The invention belongs to technical field of sewage, particularly relate to a kind of air-assisted electro-coagulation algae water separation device and using method thereof, be used to be rich in the algae water sepn and the purification of little algae water body.
Background technology
Water resources is one of mankind's keystone resources of depending on for existence.Along with urbanization degree of progress speed and industrial development, human also increasing to precious water resource ecotope applied pressure.A large amount of trade effluents and sanitary sewage enter in rivers, lake and the reservoir, cause that the Phosphorus nutritive substance of ammonia nitrogen constantly increases in the water body, and the eutrophication problem of water body in lake is on the rise, and the ecosystem is degenerated.According to the recent statistics data, 88.6% the body eutrophication problem occurs in 133 large-size lake of China.In eutrophication water, the explosive breeding of microorganism algae big area such as blue-green algae has not only suppressed other algae grows, and the transparency of water body is descended, and also can discharge deleterious metabolic substd to water body.In addition, after a large amount of blue-green algae death, can cause the dissolved oxygen wretched insufficiency of water body, produce stench.Serious water pollution brings adverse influence for ecotope and Human's production, life, and human beings'health is constituted a serious threat.Summer in 2007, serious blue-green alga bloom outburst appears in Taihu Lake, Chaohu, Dian Chi in succession.Dongting Lake, Baiyang Lake etc. also are subjected to eutrophication to some extent and threaten.In by the end of May, 2008, and the most serious since the dawn of human civilization blue-green algae incident has been broken out in Taihu Lake, causes the Wuxi resident serious water crisis once occurring.Therefore, how to address this problem the extensive concern that has caused various circles of society.
Handle if can carry out the algae water sepn, should have positive meaning purifying water body to the water body that is rich in little algae.The separation of present little algae and the method for collection mainly comprise: centrifugal, filtration, flocculating settling etc.Because little frond granularity is superfine, centrifugation method efficient is low, and in order effectively to separate algae water, whizzer needs to operate under higher rotation speed, and energy consumption is big.The more employing membrane filtration of filtration method equipment, but film obstruction easily after use for some time, the multiplexing complex process of regenerating can't realize continuous operation.The various chemical flocs of the general interpolation of the method for flocculating settling cause the secondary pollution of water body easily.
In recent years, the technology that adopts the electricity flocculation to carry out the algae water sepn has caused that people greatly pay close attention to.The mechanism of the little algae of electricity flocculation separation mainly contains: 1. electrooxidation is destroyed little algae organism and is caused the flocculation of reuniting; Dissolve the metal ion that from electrode when 2. active metal electrode uses and produce throwing out as flocculation agent; 3. hydrogen that produces in the water electrolysis process and oxygen are to little algae dissolved air flotation.Compare advantage such as electricity flocculation has the separation efficiency height, need not to add chemical floc, easy and simple to handle and technological process is controlled with other algae water separating methods.The electricity flocculation has been attempted being used for the separation of different microalgae water body: the method for employings such as Alfafara and Nakano electricity flocculation is removed Microcystis aeruginosa (Microcrystissp.) (the Alfafara C.G. of lake water, Nakano K., Nomura N., Igarashi T., Matsumura M.J.Chem.Technol.Biotechnol., 2002,77,871); Poelman has verified by experiment that with DePauw etc. electric flocculation is used for the recovery (Poelman E., DePauw N., Jeurissen B., Resour.Conserv.Recy., 1997,19,1) of little algaes such as various different green algas, diatom.Yet the electric flocculation separation process of little algae still has problems: 1. microalgae cell flocculation back is adsorbed on electrode surface in the electrode surface precipitation, and the reduction of active electrode pole plate area causes electric flocculation efficiency to descend.If adopt the slot type device, to handle owing to need frequent counter electrode surface to carry out scale removal in the operating process, the continuous operation difficulty is big.2. electrolysis gas production rate is little, and daf efficiency is low.3. the industrialization amplification of slot type electricity flocculation plant is also unfavorable, the device structure complexity, and maintenance is difficult for.Therefore, have not yet to see the industrialization report of relevant little algae electricity flocculation.
Adopt the method for the little algae of dissolved air flotation that report is also arranged.But need add chemical floc mostly in advance little algae to be separated is flocculated in advance, utilize the bubble surface absorption of rising, the little algae that captures reunion to move upward then, realize the algae water sepn.Because the micro-bubble surface-area that blasts in the water body is big, fractionation by adsorption efficient height; Simultaneously, coalescence, broken wall might take place at uphill process in bubble, and the energy that the explosion of disruptive bubble produces further impels the little algae in the water body to reunite.But the little algae of dissolved air flotation does not see the industrialization report yet at present, easily causes the secondary pollution of water except that need add chemical floc, and the amplification and the continuous operation of equipment also have problems.
Therefore, how effectively to flocculate and two kinds of technology of air supporting in conjunction with electricity, the continuous device of developing the flocculation of little algae electricity has crucial meaning, must develop little algae electricity flocculation apparatus that can adapt to industrial continuous operation requirement, the advantage of competence exertion electricity flocculation in little algae separates makes it have the value of applying.
Summary of the invention
The object of the present invention is to provide a kind of air-assisted electro-coagulation algae water separation device and using method thereof, to overcome the defective that present little algae electricity flocculation apparatus is difficult to realize the industrialization operate continuously.
Apparatus of the present invention comprise parts such as tower body, main shaft, concentric drums battery lead plate, mechanical drive, linkage assembly, floating ball device, gas distributor, pulse air supply plant; Main shaft passes the vertical centre hole of tower body top cylinder shape cavity, and the main shaft upper end is positioned at outside the tower body and is connected with linkage assembly; The main shaft lower end is positioned at tower body and is connected with floating ball device, main shaft (main shaft is a metal material) top is positioned at the tower body outside two circular conductive metal sheets is installed, do to be flexible coupling with the positive pole and the negative pole of a direct current power supply (voltage of D.C. regulated power supply is 6～24 volts, and electric current is 1～1.5 ampere) respectively with lead; Floating ball device is positioned at tower body inner bottom part expanding reach cavity, and floating ball device is connected with the main shaft lower end; Gas distributor is arranged at concentric drums below, tower body bottom; The pulse air supply plant is by pulse ac power supply power supply, with intermittent mode to the gas distributor air feed.
Tower body is the cylinder barrel shaped structure, and the expanding reach enclosed cavity has all been designed in top and the bottom.Wherein, the top end face center drilling of tower body top cylinder shape cavity; The bottom face of tower body lower cylindrical cavity is a conical structure, is provided with a slag notch and links to each other with valve.The material of tower body is metal or plastics, and the tower body liner is a corrosion protection coating.
The side that tower body top is positioned at the expanding reach cavity is provided with overflow outlet; Tower body top is positioned at the below of expanding reach cavity, is provided with a liquor inlet and links to each other with valve; The tower body bottom is positioned at the top of expanding reach cavity, is provided with a material liquid outlet and links to each other with valve.
The big I of the voltage and current of described direct supply is according to the processing requirement adjustment.Anode metal plate is a disc; The cathodic metal plate is a circular ring structure, and interannular leaves the space, and ring spacing is fixed with four mutually orthogonal conductive metal sheets.Anode links to each other with main shaft with insulating material respectively with the cathodic metal plate, and fixing with locating device 4.Separate with insulating material between anode on the main shaft and cathodic metal plate.
Be welded with a series of concentric drums respectively on anode on the described main shaft and the cathodic metal plate.Anode and negative electrode concentric drums even-even are interspersed, 1～10 millimeter of concentric drums spacing.The concentric drums material is conductive metallic material.The negative electrode concentric drums is welded on four mutually orthogonal conductive metal sheets, and the thickness of the conductive metal sheet of fixed negative pole concentric drums is 1～4 millimeter; Each anode concentric drums all leaves four long and narrow slits, and slit width L is 5～10 millimeters, and the conductive metal sheet of fixed negative pole concentric drums passes from slit, does not contact with the anode concentric drums.
Described mechanical drive is positioned at outside the tower body, the eccentric wheel that includes a linkage assembly and be attached thereto.Linkage assembly passes a fixed hub and links to each other with the main shaft upper end; Eccentric wheel motor driven rotary.When electric motor rotated, main shaft was made up-down vibration.The amplitude of main shaft and the frequency that shakes can be regulated, and can adjust the amplitude of main shaft by adjusting eccentric eccentricity, can regulate shaking frequently of main shaft and change motor speed.
Described floating ball device is a fusiform hollow float device, and floating ball device can make moving partss such as tower inner main axis and anode and cathode concentric drums battery lead plate be in floating state.The material available metal of floating ball device, also available plastics, outside surface is done rotproofing.
Described gas distributor is made up of a gas distribution head and a shield cap.Shield cap is located at the gas distribution head top, and itself and gas distribution head spacing are advisable not hinder air-blowing.Shield cap is fixed on the main shaft with locating device, and it act as the solid particulate that prevents to fall and stops up gas distribution head.Gas distribution head is made by the ceramic base porous material, and inner chamber is hollow to link to each other with air duct, by air supply plant gases such as air is sent from the gas distribution head bubbling; The bubble size is controlled by gas distribution head surface micropore aperture.
Described pulse air supply plant air feed duration and tolerance can be regulated according to processing requirement.The air feed duration can be regulated the pulse ac supply frequency and realize, and air feed tolerance can realize to produce different air pressure by regulating impulse AC power power.The pulse air supply plant links to each other with air duct, and the centre is provided with valve.The air feed of pulse air-blowing device is 1～5 minute, 30 seconds～1 minute at interval, and air pressure 1～4MPa.
Using method of the present invention is: the feed liquid that contains little algae pumps into from opening for feed, be connected on the main shaft anode and cathode conductive concentric cylinder electrode plate and with main shaft under motor drives, do up and down reciprocatingly vibration.After the energising, the little algae in the feed liquid produces flocculation reunion sedimentation under electric field action.The intermittently air-blowing of tower body lower gas sparger pulsed produces a large amount of bubbles.Carry little algae behind little algae of rising bubble surface adsorption flocculation to the motion of tower body top.Coalescence, broken wall might take place at uphill process in bubble, and the energy that the explosion of disruptive bubble produces further impels the little algae in the water body to reunite.Little algae of reuniting is further coalescence in uphill process, and particle is grown up, and is finally brought to the fluid surface of tower body top expanding reach cavity by bubble.Below 7, liquor inlet is more than 16 in little algae outlet for liquid level in the expanding reach cavity of tower body top, and little algae of enrichment can be flowed out and collection from overflow port 7 on the liquid level.Little algae in the feed liquid is finished the algae water sepn under electricity flocculation and two kinds of effects of air supporting, and the clear liquid of having removed little algae is positioned at the material liquid outlet outflow of expanding reach cavity top from the tower body bottom.
The velocity ratio of liquor inlet and material liquid outlet is 1: 0.5～1: 1, and preferred velocity ratio is 1: 0.85～1: 0.95.
The invention has the advantages that:
1, adopt a series of concentric drums anode and cathode battery lead plates to make up-down vibration or/and tower body lower gas sparger is done intermittently air-blowing of pulsed, little algae that its purpose is effectively to prevent to rise with bubble is improved electric flocculation efficiency in electrode surface adsorption precipitation.
2, adopt the anode and cathode battery lead plate of a series of concentric drums as electric flocculation plant, even-even is interspersed, and purpose is to increase as far as possible electrode surface area, to improve electric flocculation efficiency.
3, liquid flow direction is opposite with little algae direction of motion of reunion flocculating settling in the tower, forms cross-flow, can strengthen mass transfer, improves electric flocculation efficiency.
4, adopt floating ball device, utilize the buoyancy of water body make moving parts in the tower (comprise main shaft with its on the anode and cathode cylinder electrode plate that is connected etc.) be in floating state, can reduce the operating load of driving motor.
5, air-assisted electro-coagulation algae water separation device of the present invention can be realized the operate continuously that the flocculation of little algae electricity, air supporting are collected, and the various decontamination effect improvings that are rich in little algae water body after this device is handled can reach country-level water quality standard.
6, apparatus of the present invention basic structure is simple, is easy to amplify implement, and is applicable to the continuous operating requirement of heavy industrialization.Under the volume condition of certain tower chamber, the size of the velocity ratio of control liquor inlet and material liquid outlet, control anode and cathode concentric drums battery lead plate impressed voltage and electric current, the air feed of setting pulse air supply plant be duration and tolerance size at interval, can control the processing power of equipment.
Apparatus of the present invention if need device is shut down maintenance, can be opened the slag notch, the valve that are positioned at tower body lower cylindrical cavity in use for some time, clean the tower body deslagging.
Description of drawings
Fig. 1 is the structural representation of novel air-assisted electro-coagulation algae water separation device of the present invention.Wherein, mechanical drive 1, linkage assembly 2, fixed hub 3, locating device 4, anode concentric drums battery lead plate 5, negative electrode concentric drums battery lead plate 6, overflow outlet 7, tower body 8, shield cap 9, gas distributor 10, pulse air supply plant 11, material liquid outlet 12, floating ball device 13, slag notch 14, main shaft 15, liquor inlet 16, direct supply 17, valve 18.
Fig. 2 is the three-dimensional assembly diagram of anode and cathode concentric drums battery lead plate of the present invention, and negative electrode concentric drums battery lead plate is fixed with four mutually orthogonal conductive metal sheets.
Fig. 3 is the vertical view of anode concentric drums battery lead plate 5, and each anode concentric drums all leaves four long and narrow slits.
Fig. 4 is the front view of anode concentric drums battery lead plate 5, and slit width L should be greater than the thickness of the conductive metal sheet of fixed negative pole concentric drums, and leave the space.
Fig. 5 is the vertical view of negative electrode concentric drums battery lead plate 6, and the negative electrode concentric drums is welded on four mutually orthogonal conductive metal sheets.
Fig. 6 is the rotation profile of negative electrode concentric drums battery lead plate 6.
Fig. 7 is the vertical view of the structural representation of gas distributor of the present invention.
Fig. 8 is the stereographic map of the structural representation of gas distributor of the present invention.
Fig. 9 is the vertical view of shield cap.
The front view of Figure 10 shield cap.
Embodiment
The inventive system comprises parts such as tower body 8, main shaft 15, concentric drums battery lead plate 5,6, mechanical drive 1, linkage assembly 2, floating ball device 13, gas distributor 10, pulse air supply plant 11; Main shaft 15 passes the vertical centre hole of tower body 8 top cylinder shape cavitys, and main shaft 15 upper ends are positioned at outside the tower body 8 and are connected with linkage assembly 2; Main shaft 15 lower ends are positioned at tower body 8 and are connected with floating ball device 13, and main shaft 15 tops are positioned at the tower body outside two circular conductive metal sheets 5,6 are installed, and do to be flexible coupling with the positive pole and the negative pole of a direct current power supply 17 respectively with lead; Floating ball device 13 is positioned at tower body 8 inner bottom part expanding reach cavitys, and floating ball device 13 is connected with main shaft 15 lower ends; Gas distributor 10 is arranged at concentric drums below, tower body 8 bottom; Pulse air supply plant 11 is by pulse ac power supply power supply, with intermittent mode to the gas distributor air feed.
The algae water power flocculation separation of embodiment 1 Kunming Dianchi lake blue-green algae water body and air supporting are collected
Utilize apparatus of the present invention to investigate the algae water power flocculation separation effect of Kunming Dianchi lake blue-green algae water body.The velocity ratio of control liquor inlet 16 and material liquid outlet 12 is 1: 0.95,24 volts of the impressed voltages of direct supply 17,1.5 amperes in electric current, the air feed duration of pulse air-blowing device 11 1 minute, 30 seconds at interval, air pressure 4.0MPa is measuring micro algae biomass to the clear liquid of material liquid outlet 12 in the separated and collected process continuously, and little algae yield is 98.5%.
The algae water power flocculation separation of Taihu Lake, embodiment 2 Wuxi blue-green algae water body and air supporting are collected
Utilize apparatus of the present invention to investigate the algae water power flocculation separation effect of Taihu Lake, Wuxi blue-green algae water body.The velocity ratio of control liquor inlet 16 and material liquid outlet 12 is 1: 0.85,24 volts of the impressed voltages of direct supply 17,1.5 amperes in electric current, the air feed duration of pulse air-blowing device 11 5 minutes, 1 minute at interval, air pressure 2.0MPa is measuring micro algae biomass to the clear liquid of material liquid outlet 12 in the separated and collected process continuously, and little algae yield is 99.0%.
Algae water power flocculation separation of little algae and air supporting are collected in embodiment 3 spirulina mediums
Utilize apparatus of the present invention to investigate algae water power flocculation separation effect to little algae in the spirulina medium.The velocity ratio of control nutrient solution fluid inlet 16 and clear liquid liquid outlet 12 is 1: 0.9,6 volts of the impressed voltages of direct supply 17,1.0 amperes in electric current, the air feed duration of pulse air-blowing device 11 2 minutes, 45 seconds at interval, air pressure 1.0MPa is measuring micro algae biomass to the clear liquid of material liquid outlet 12 in the separated and collected process continuously, and the spirulina yield is 97.5%.
Claims (10)
1. an air-assisted electro-coagulation algae water separation device comprises tower body, main shaft, concentric drums battery lead plate, mechanical drive, linkage assembly, floating ball device, gas distributor, pulse air supply plant; It is characterized in that: main shaft (15) passes the vertical centre hole of tower body (8) top cylinder shape cavity, and main shaft (15) upper end is positioned at outside the tower body 8 and is connected with linkage assembly (2); Main shaft (15) lower end is positioned at tower body (8) and is connected with floating ball device (13), and main shaft (15) top is positioned at the tower body outside two circular conductive metal sheets (5,6) is installed, and does to be flexible coupling with the positive pole and the negative pole of a direct current power supply (17) respectively with lead; Floating ball device (13) is positioned at tower body (8) inner bottom part expanding reach cavity, and floating ball device (13) is connected with main shaft (15) lower end; Gas distributor (10) is arranged at concentric drums below, tower body (8) bottom; Pulse air supply plant (11) is by pulse ac power supply power supply, with intermittent mode to the gas distributor air feed.
2. device according to claim 1 is characterized in that: tower body (8) is the cylinder barrel shaped structure, and the expanding reach enclosed cavity has all been designed in top and the bottom; The top end face center drilling of tower body top cylinder shape cavity; The bottom face of tower body lower cylindrical cavity is a conical structure, is provided with a slag notch (14) and links to each other with valve; The material of tower body is metal or plastics, and the tower body liner is a corrosion protection coating; The side that tower body top is positioned at the expanding reach cavity is provided with overflow outlet (7); Tower body top is positioned at the below of expanding reach cavity, is provided with a liquor inlet (16) and links to each other with valve; The tower body bottom is positioned at the top of expanding reach cavity, is provided with a material liquid outlet (12) and links to each other with valve.
3. device according to claim 1 is characterized in that: the voltage and current of described direct supply is according to the processing requirement adjustment, and anode metal plate is a disc; The cathodic metal plate is a circular ring structure, and interannular leaves the space, and ring spacing is fixed with four mutually orthogonal conductive metal sheets; Anode links to each other with main shaft with insulating material respectively with the cathodic metal plate, and fixing with locating device 4; Separate with insulating material between anode on the main shaft and cathodic metal plate.
4. device according to claim 1 is characterized in that: be welded with a series of concentric drums respectively on anode on the main shaft and the cathodic metal plate; Anode and negative electrode concentric drums even-even are interspersed, 1～10 millimeter of concentric drums spacing; The concentric drums material is conductive metallic material; The negative electrode concentric drums is welded on four mutually orthogonal conductive metal sheets, and the thickness of the conductive metal sheet of fixed negative pole concentric drums is 1～4 millimeter; Each anode concentric drums all leaves four long and narrow slits, and slit width L is 5～10 millimeters, and the conductive metal sheet of fixed negative pole concentric drums passes from slit, does not contact with the anode concentric drums.
5. device according to claim 1 is characterized in that: mechanical drive is positioned at outside the tower body, the eccentric wheel (1) that includes a linkage assembly (2) and be attached thereto; Linkage assembly passes a fixed hub (3) and links to each other with the main shaft upper end; Eccentric wheel motor driven rotary; When electric motor rotated, main shaft was made up-down vibration.
6. device according to claim 1 is characterized in that: described floating ball device (13) is a fusiform hollow float device, and floating ball device makes tower inner main axis (15) and anode and cathode concentric drums battery lead plate (5,6) moving parts be in floating state; The floating ball device material is metal or plastics, and outside surface is done rotproofing.
7. device according to claim 1 is characterized in that: described gas distributor (10) is made up of a gas distribution head and a shield cap (9); Shield cap (9) is located at the gas distribution head top, shield cap (9) shield cap is fixed on the main shaft with locating device, gas distribution head is made by the ceramic base porous material, and the gas distribution head inner chamber is hollow to link to each other with air duct, by pulse air supply plant (11) gas is sent from the gas distribution head bubbling; The air feed of pulse air-blowing device (11) is 1～5 minute, 30 seconds～1 minute at interval, and air pressure 1～4MPa.
8. device according to claim 1 is characterized in that, the voltage of D.C. regulated power supply (17) is 6～24 volts, and electric current is 1～1.5 ampere.
9. described air-assisted electro-coagulation algae water separation device using method of claim 1, it is characterized in that, the feed liquid that contains little algae pumps into from opening for feed (16), be connected anode and cathode conductive concentric cylinder electrode plate (5,6) on the main shaft (15) with main shaft (15) under motor drives, do vibration up and down reciprocatingly; After the energising, the little algae in the feed liquid produces flocculation reunion sedimentation under electric field action; The intermittently air-blowing of tower body lower gas sparger (10) pulsed produces a large amount of bubbles; Carry little algae behind little algae of rising bubble surface adsorption flocculation to the motion of tower body top; Coalescence, broken wall might take place at uphill process in bubble, and the energy that the explosion of disruptive bubble produces further impels the little algae in the water body to reunite.Little algae of reuniting is further coalescence in uphill process, and particle is grown up, and is finally brought to the fluid surface of tower body top expanding reach cavity by bubble; Liquid level exports below (7) in little algae in the expanding reach cavity of tower body top, and more than the liquor inlet (16), little algae of enrichment can be flowed out and collection from overflow port (7) on the liquid level; Little algae in the feed liquid is finished the algae water sepn under electricity flocculation and two kinds of effects of air supporting, and the clear liquid of having removed little algae is positioned at material liquid outlet (12) outflow of expanding reach cavity top from the tower body bottom.
10. method according to claim 9 is characterized in that, the velocity ratio of liquor inlet (16) and material liquid outlet (12) is 1: 0.85～1: 0.95.
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| CN102703317A (en) * | 2012-05-29 | 2012-10-03 | 哈尔滨工业大学 | Electroflocculation microalgae-collecting device |
| CN102787070A (en) * | 2012-09-04 | 2012-11-21 | 天津工业生物技术研究所 | Solar salt bridge electroflocculation device for microalga recovery |
| CN103043755A (en) * | 2012-12-24 | 2013-04-17 | 中国科学院过程工程研究所 | Electric flocculation device for separation and collection of industrial air-assisted microalgae water |
| CN103523869A (en) * | 2012-07-06 | 2014-01-22 | 刘辉 | Rotary-drum high-voltage pulse electric flocculation device |
| WO2014074790A1 (en) * | 2012-11-09 | 2014-05-15 | Heliae Development, Llc | Reducing concentration of contamination with electro-coagulation |
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| CN104768877A (en) * | 2012-04-17 | 2015-07-08 | 源油公司 | Harvesting and dewatering algae using a two-stage process |
| CN104803523A (en) * | 2015-04-13 | 2015-07-29 | 南昌大学 | Electric flocculation and air floatation combined continuous microalgae harvesting device and method |
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