CN104803523B - The continuous harvesting apparatus of microalgae and method thereof associated with a kind of electricity flocculation-flotation - Google Patents
The continuous harvesting apparatus of microalgae and method thereof associated with a kind of electricity flocculation-flotation Download PDFInfo
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- CN104803523B CN104803523B CN201510169188.7A CN201510169188A CN104803523B CN 104803523 B CN104803523 B CN 104803523B CN 201510169188 A CN201510169188 A CN 201510169188A CN 104803523 B CN104803523 B CN 104803523B
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Abstract
The continuous harvesting apparatus of microalgae and method thereof associated with a kind of electricity flocculation-air floating, comprise the most interconnective electricity flocculation-air floating district, results district, exhalant region and air-flotation system.Algae solution and bittern aqueous mixtures being flowed through a raceway pond be sufficiently mixed, entrance is at the deep trouth of the end of raceway pond；Due-in algae pumps into from algae solution entrance and rises to electrolytic zinc-coated steel sheet, and the hydroxide colloid of the iron discharged by electrode flocculates；It is flocculated the microalgae cell group of reunion, is floated by the microbubble absorption of molten gas liberation port release, and promote microalgae cell group to reunite further, flow into results district, scrape into storage algae pond through scraping algae machine, send into dewatered drying operation；Clear water bottom results district, enters exhalant region by the space of baffle plate two bottom.The present invention substantially increases the efficiency of crop of microalgae.This plant investment is few, and floor space is little, simple to operate, has low-energy-consumption high-efficiency, the advantage of environmental protection, is suitable for large-scale production.
Description
Technical field
The invention belongs to biological technical field, relate to the devices and methods therefor of a kind of continuous microalgae results.
Background technology
The results high cost of microalgae always restricts one of bottleneck problem of its large-scale production, and the main method of current microalgae harvesting has membrane filtration, centrifugal and flocculation etc..Membrane filter method not only production efficiency is the lowest, and the easy contamination and plugging of film, the regeneration of film or the cost of renewal are the highest.Therefore industrialization production application is not suitable for.Centrifugal is the method more commonly used, though without adding other chemical reagent, but operation complexity, energy consumption is big, and cost is high.Chinese invention patent " a kind of tube centrifuge microalgae collection device (CN201220618371.2) " discloses a kind of tube centrifuge microalgae collection device, its drip irrigation device is: get rid of liquid from algae solution by centrifugal filtration, algae solution is introduced in an atwirl netted sleeve, by high speed centrifugation effect, microalgae is left on the online of porous, and liquid then centrifugalization is extruded from mesh.Although this apparatus structure is simple, it is provided with dismountable discharging sleeve, improves the yield rate of microalgae.But need discharging after its microalgae is centrifugal, unpick and wash and installation is required to the time, and centrifugal be the huge process of an energy consumption, virtually add the results cost of microalgae, be unfavorable for industrialized production.
The flocculation sediment harvest method of microalgae is the most also paid attention to, and such as Chinese invention patent " a kind of microalgae flocculating setting harvesting method (CN201410453206.X) " discloses and a kind of utilizes quaternary ammonium salt cationic starch as flocculant and to combine the method that the mode of stirring makes the abundant flocculating setting of microalgae be collected to the pot bottom that flocculates.Although the method technique is simple, the reaction time is short, and flocculating effect is good；But its required flocculation dosage is too much, not only can increase cost, also microalgae harvesting thing and water body can be caused certain pollution, and flocculation is required for longer time of repose, it is impossible to continuous prodution every time.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that the continuous harvesting apparatus of microalgae and method thereof associated with a kind of microalgae electricity flocculation-flotation, it is achieved the continuous harvesting method of eco-friendly microalgae, improve the efficiency of crop of microalgae, reduce its production cost.
The present invention is achieved by the following technical solutions.
Device of the present invention includes the most interconnective electricity flocculation-air floating district, results district, exhalant region and air-flotation system.
Described electric flocculation-air floating district is made up of algae solution entrance (1), molten gas liberation port (2), electrolytic zinc-coated steel sheet (3), baffle plate (4).
Described results district is by scraping algae machine (5), and storage algae pond (6), receipts algae mouth (7), slag-drip opening (8), baffle plate (9) forms.
Described exhalant region is made up of gap (17), drainpipe (18).
Described air-flotation system is made up of air dissolved pump water inlet pipe (10), butterfly valve (11), molten gas air inlet pipe (12), air dissolved pump (13), dissolving (14), dissolved-air pressure table (15), air dissolved pump drain pipe (16).
nullThe annexation of apparatus of the present invention each several part is: algae solution entrance (1) and molten gas liberation port (2) are positioned at the bottom in electricity flocculation-air floating district，The top of molten gas liberation port (2) is electrolytic zinc-coated steel sheet (3)，Electrolytic zinc-coated steel sheet (3) be followed by baffle plate one (4)，Baffle plate one (4) is below for results district，Algae solution flows through baffle plate (4) and enters results district，Results top, district is to scrape algae machine (5)，Scrape Shi Chuzao pond, algae machine (5) back lower place (6)，Receive algae mouth (7) and be positioned at storage algae pond (6) bottom，Slag-drip opening (8) is positioned at bottom results district，Results district is followed by baffle plate two (9)，Baffle plate two (9) is exhalant region below，Clear water passes through baffle plate two (9) space below and enters exhalant region，It is gap (17) in the middle part of exhalant region，Top is drainage pipeline (18)，Bottom is air dissolved pump water inlet (10)，Butterfly valve (11) is installed on air dissolved pump water inlet pipe (10)，Clear water enters into air-flotation system by air dissolved pump water inlet (10)，Air dissolved pump water inlet pipe is connected with molten gas air inlet pipe (12)，Another with being connected to air dissolved pump (13)，Air dissolved pump (13) upper end connects dissolving (14)，Lower end connects air dissolved pump drain pipe (16)，Dissolved-air pressure table (15) is installed on air dissolved pump drain pipe (16)，Air dissolved pump drain pipe (16) is connected with molten gas liberation port (2) then.
Associated with a kind of electricity flocculation-flotation of the present invention, the continuous harvesting method of microalgae is according to the following steps.
The due-in algae solution of step 1) prepares: derive algae solution by certain flow rate from microalgae photosynthetic reaction system, from bittern water storage tank, derive bittern water by certain flow rate simultaneously, algae solution and bittern aqueous mixtures flow through a raceway pond and are sufficiently mixed, and entrance is at the deep trouth (for due-in algae solution) of the end of raceway pond；Algae solution and bittern water being sufficiently mixed is the electrical conductivity in order to improve algae solution, reduces the required energy consumption of results.
Step 2) microalgae flocculation: due-in algae pumps into and rises to electrolytic zinc-coated steel sheet (3) from algae solution entrance (1), and the hydroxide colloid of the iron discharged by electrode flocculates.
Step 3) flocculation microalgae air supporting is gathered in the crops: be flocculated the microalgae cell group of reunion, the microbubble discharged by molten gas liberation port (2) adsorbs floating, in microbubble uphill process, explosion generation active force promotes microalgae cell group to reunite further, microalgae cell group flows through baffle plate one (4) with main flow and enters results district, rise to liquid level, the microalgae of liquid surface is scraped algae machine (5) and is scraped into storage algae pond (6), collected algae slurry is collected by receipts algae mouth (7) of storage algae pond (6) bottom, sends into next step dewatered drying operation.
Step 4) clear water discharges: the clear water bottom results district, exhalant region is entered by the space of baffle plate two (9) bottom, if liquid level is higher, by gap (17), clear water is discharged (clear water mass rate of emission balances with due-in algae solution inflow velocity) by drainpipe (18), major part water by air dissolved pump water inlet (10) enter air-flotation system and mix with the air inlet of molten gas air inlet pipe (12) by air dissolved pump (13) a part of mixed liquor entrance dissolving (14) temporarily store, a part is connected with molten gas liberation port (2) by air dissolved pump drain pipe (16) and enters electricity flocculation-air floating district, maintain the stable level in device.
It is an advantage of the current invention that.
(1) electricity flocculation is creatively combined by the present invention with two techniques of dissolved air flotation, completes, eliminate some loaded down with trivial details unnecessary steps, substantially increase the efficiency of crop of microalgae in same device.This plant investment is few, and floor space is little, simple to operate, has low-energy-consumption high-efficiency, the advantage of environmental protection, it is simple to large-scale production.
(2) this device electrolytic zinc-coated steel sheet uses and holes below iron material, and electrolytic zinc-coated steel sheet immersed in liquid level, and boring can increase the contact area of electroplax and water body, improves electrolytic efficiency.And iron toxic effect unlike aluminium, iron price is only the most cheaply aluminium about 1/4th.
(3) the molten gas liberation port of dissolved gas floatator is made up of multiple little mouths of pipe, covers electrolytic zinc-coated steel sheet with making microbubble maximum area, its objective is to ensure that the microbubble that dissolved air type air-float produces fully contacts with floccule body, brings it to water surface.
(4) can add bittern water and improve electrical conductivity, the magnesium hydroxide floccule body that electrolysis produces has stronger adsorption capacity.
Accompanying drawing explanation
Fig. 1 is the structural representation of present device.
Fig. 2 is the right view of present device.
In figure: A is electricity flocculation-air floating district, B is results district, and C is exhalant region, and D is air-flotation system.1 is algae solution entrance, and 2 is molten gas liberation port, and 3 is electrolytic zinc-coated steel sheet, 4 is baffle plate one, and 5 for scraping algae machine, and 6 is storage algae pond, 7 for receiving algae mouth, and 8 is slag-drip opening, and 9 is baffle plate two, 10 is air dissolved pump water inlet pipe, and 11 is butterfly valve, and 12 is molten gas air inlet pipe, 13 is air dissolved pump, and 14 is dissolving, and 15 is dissolved-air pressure table, 16 is air dissolved pump drain pipe, and 17 is gap, and 18 is drainpipe.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.
Device of the present invention is as shown in Figures 1 and 2.
The microalgae harvesting method of the present invention is by necessarily deriving algae solution by the flow velocity of 5L/MIN from microalgae photosynthetic reaction system, the flow velocity simultaneously pressing 0.01L/MIN derives bittern water from bittern water storage tank, algae solution and bittern aqueous mixtures flow through a raceway pond and are sufficiently mixed, entrance, at the deep trouth of the end of raceway pond, is for due-in algae solution；Start the continuous harvesting apparatus of microalgae associated with the electric flocculation-flotation of the present invention, the flow velocity that due-in algae solution presses 5.01L/MIN by algae solution entrance 1 enters electricity flocculation-air floating district, when liquid level in device did not just have electrolytic zinc-coated steel sheet, start electricity flocculation and air-floating apparatus, regulation micro-12 volts of flocculation plant voltage of electricity, current strength is 20 amperes, regulation air dissolved pump water inlet pipe butterfly valve 11 controls inflow and molten gas speed with air dissolved pump air inlet valve and observation air dissolved pump feed rate table, making microbubble is intensive milky white state, microalgae flocculation swims in liquid level, and flow through results district, started by equipment control case and scrape algae machine, the flocculate of algae is scraped into storage algae pond, again by receiving algae mouth harvesting microalgae, send into following process program.Clear water bottom results district, entering exhalant region by the space of baffle plate two (9) bottom, if liquid level is higher, by gap (17), clear water is discharged by drainpipe (18), the flow control of clear water discharge is about 5.00L/MIN, makes liquid level maintain the operation interval scraping algae machine always.
Claims (1)
1. the continuous harvesting method of microalgae associated with electric flocculation-flotation, equipment therefor includes the most interconnective electricity flocculation-air floating district, results district, exhalant region and air-flotation system；Electricity flocculation-air floating district is made up of algae solution entrance (1), molten gas liberation port (2), electrolytic zinc-coated steel sheet (3), baffle plate one (4)；Results district is by scraping algae machine (5), and storage algae pond (6), receipts algae mouth (7), slag-drip opening (8), baffle plate two (9) forms；Exhalant region is made up of gap (17), drainpipe (18)；Air-flotation system is made up of air dissolved pump water inlet, butterfly valve (11), molten gas air inlet pipe (12), air dissolved pump (13), dissolving (14), dissolved-air pressure table (15), air dissolved pump drain pipe (16)；nullAlgae solution entrance (1) and molten gas liberation port (2) are positioned at the bottom in electricity flocculation-air floating district，The top of molten gas liberation port (2) is electrolytic zinc-coated steel sheet (3)，Electrolytic zinc-coated steel sheet (3) be followed by baffle plate one (4)，Baffle plate one (4) is below for results district，Algae solution flows through baffle plate one (4) and enters results district，Results top, district is to scrape algae machine (5)，Scrape Shi Chuzao pond, algae machine (5) back lower place (6)，Receive algae mouth (7) and be positioned at storage algae pond (6) bottom，Slag-drip opening (8) is positioned at bottom results district，Results district is followed by baffle plate two (9)，Baffle plate two (9) is exhalant region below，Clear water passes through baffle plate two (9) space below and enters exhalant region，It is gap (17) in the middle part of exhalant region，Top is drainpipe (18)，Bottom is air dissolved pump water inlet，Butterfly valve (11) is installed on air dissolved pump water inlet，Clear water enters into air-flotation system by air dissolved pump water inlet，Air dissolved pump water inlet pipe is connected with molten gas air inlet pipe (12)，Another with being connected to air dissolved pump (13)，Air dissolved pump (13) upper end connects dissolving (14)，Lower end connects air dissolved pump drain pipe (16)，Dissolved-air pressure table (15) is installed on air dissolved pump drain pipe (16)，Air dissolved pump drain pipe (16) is connected with molten gas liberation port (2) then；It is characterized in that according to the following steps:
Step 1): deriving algae solution by certain flow rate from microalgae photosynthetic reaction system, derive bittern water by certain flow rate simultaneously from bittern water storage tank, algae solution and bittern aqueous mixtures flow through a raceway pond and be sufficiently mixed, and entrance is at the deep trouth of the end of raceway pond；
Step 2): due-in algae pumps into and rises to electrolytic zinc-coated steel sheet (3) from algae solution entrance (1), and the hydroxide colloid of the iron discharged by electrode flocculates；
Step 3): be flocculated the microalgae cell group of reunion, the microbubble discharged by molten gas liberation port (2) adsorbs floating, in microbubble uphill process, explosion generation active force promotes microalgae cell group to reunite further, microalgae cell group flows through baffle plate one (4) with main flow and enters results district, rise to liquid level, the microalgae of liquid surface is scraped algae machine (5) and is scraped into storage algae pond (6), collected algae slurry is collected by receipts algae mouth (7) of storage algae pond (6) bottom, sends into next step dewatered drying operation；
Step 4): the clear water bottom results district, exhalant region is entered by the space of baffle plate two (9) bottom, if liquid level is higher, by gap (17), clear water is discharged by drainpipe (18), clear water mass rate of emission balances with due-in algae solution inflow velocity, major part water by air dissolved pump water inlet enter air-flotation system and mix with the air inlet of molten gas air inlet pipe (12) by air dissolved pump (13) a part of mixed liquor entrance dissolving (14) temporarily store, a part is connected with molten gas liberation port (2) by air dissolved pump drain pipe (16) and enters electricity flocculation-air floating district, maintain the stable level in device.
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| CN106399045B (en) * | 2015-07-31 | 2019-01-04 | 中国科学院青岛生物能源与过程研究所 | A kind of portable low energy consumption air-floating apparatus and application method for microalgae recovery |
| CN105176826B (en) * | 2015-10-20 | 2018-08-03 | 清华大学 | A kind of method and separator of alkalescent flocculation-foam fraction factor microalgae |
| CN107012072B (en) * | 2017-04-10 | 2023-10-31 | 南昌大学 | Optical biomembrane reactor and application thereof in sewage treatment, carbon fixation and microalgae collection |
| CN107827211B (en) * | 2017-12-13 | 2023-07-18 | 重庆大学 | Electrochemical reaction tank for treating algae-containing water |
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| CN101811757A (en) * | 2010-04-26 | 2010-08-25 | 中国科学院过程工程研究所 | Air-assisted electro-coagulation algae water separation device and using method thereof |
| CN202519115U (en) * | 2012-04-19 | 2012-11-07 | 波鹰(厦门)科技有限公司 | Nano-catalysis, electrolysis, flocculation and air-floatation device |
| CN204848533U (en) * | 2015-04-13 | 2015-12-09 | 南昌大学 | Electricity flocculation - air supporting allies oneself with continuous harvesting apparatus of little algae of usefulness |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811757A (en) * | 2010-04-26 | 2010-08-25 | 中国科学院过程工程研究所 | Air-assisted electro-coagulation algae water separation device and using method thereof |
| CN202519115U (en) * | 2012-04-19 | 2012-11-07 | 波鹰(厦门)科技有限公司 | Nano-catalysis, electrolysis, flocculation and air-floatation device |
| CN204848533U (en) * | 2015-04-13 | 2015-12-09 | 南昌大学 | Electricity flocculation - air supporting allies oneself with continuous harvesting apparatus of little algae of usefulness |
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