CN102787070B - Solar salt bridge electroflocculation device for microalga recovery - Google Patents

Solar salt bridge electroflocculation device for microalga recovery Download PDF

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CN102787070B
CN102787070B CN201210323109.XA CN201210323109A CN102787070B CN 102787070 B CN102787070 B CN 102787070B CN 201210323109 A CN201210323109 A CN 201210323109A CN 102787070 B CN102787070 B CN 102787070B
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algae
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陈方见
刘晨风
刘智永
侯余勇
陈树林
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Tianjin Institute of Industrial Biotechnology of CAS
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Abstract

The invention discloses a solar salt bridge electroflocculation device for microalga recovery. The device comprises a direct-current power system, a control system and a salt bridge system. In the salt bridge system, electrolyte containing magnesium ions serves as a salt substance, a hydrogen evolution electrode mesh serves as a negative electrode, and an oxygen evolution electrode mesh or a chlorine evolution electrode mesh serves as a positive electrode. The electrolyte in a proper quantity is filled in a positive electrode chamber, and a microalga tank serves as a negative electrode chamber and is filled with microalgal liquid to be treated. After direct-current electrolysis for an enough time, the microalgal liquid in the negative electrode chamber is subjected to flocculating and settling so that flocculated microalga sludge is obtained, and bleach liquid or corresponding acid is prepared in the positive electrode chamber. The bleach liquid can be used for disinfecting the microalga tank during repeated culture, and the prepared acid can be used for removing deposits in the flocculated microalga sludge, so that high-purity microalga sludge can be obtained. Further, depositing eluate can serve as a salt substance for a salt bridge to reuse or can serve as a nutrient used widely. The microalga liquid can be flocculated in an environment-friendly, high-efficiency, low-energy-consumption and low-cost manner. Accordingly, the solar salt bridge electroflocculation device can be used for microalga recovery and large-scale industrial production of various microalga liquids.

Description

The sun power salt bridge electricity flocculation plant of gathering for micro-algae
Technical field
The present invention relates to a kind of micro-algae recovering device, relate in particular to a kind of sun power salt bridge electricity flocculation plant of gathering for micro-algae.
Background technology
Along with the day by day exhausted and increasingly serious environmental problem of non-renewable fossil oil, the whole world faces serious energy dilemma and ecocrisis, the exploitation of increasing scholar's active research new forms of energy and the biological restoration of environment.In the exploitation of new forms of energy and the biological restoration of environment, micro-algae becomes study hotspot because possessing some unique features, and these features comprise:
Micro-algae is distributed in the waters such as ocean, lake widely, of a great variety, can directly utilize the simple nutritive substance Fast Growth of the elements such as sunlight, carbonic acid gas and nitrogenous, phosphorus, and in cell synthetic a large amount of greases.Compare with oilseed plants such as soybean, rape and maniocas, the growth cycle of micro-algae is short, and oleaginousness is high, and grease productive rate is high, and unit surface oil offtake is hundreds of times of soybean, and per hectare can be produced several ten thousand per year and rise biofuel.Micro-algae can utilize beach, saltings, desert, and the growths such as underground water of seawater, Desert Area, does not strive ground with farm crop, strives water.Micro-algae fixing great amount of carbon dioxide also in culturing process, according to calculating, 1 ton of micro-algae of every cultivation, can consume approximately 2 tons of carbonic acid gas, therefore, utilizes micro-algae to manufacture the biofuel carbonic acid gas of fixed discharge in a large number.In addition, micro-algae also can utilize the nutritive ingredients such as nitrogen in waste water, phosphorus in light autotrophy culturing process, thus waste water and the city domestic sewage of clean chemical plant emission.
Current micro-algae industry still faces many bottlenecks, as low in the density of micro-algae in algae liquid, and density is less than 10g/L, causes the cost of gathering high.It is reported, micro-algae recovery process middle and lower reaches dehydration technique accounts for the gather 20%-30% of cost of micro-algae.Present stage is applied to technology kind that the micro-algae of industrialization gathers on a large scale centrifugal, filtration, flocculation etc., wherein centrifugal method energy consumption is too high, and filter method is generally only for concentrated or applicable compared with macro-algae, as spirulina, and concentration ratio is lower, still need thereafter centrifugal treating.Flucculation process is effective, and the one, throw out can be effectively separated with substratum, significantly reduces the volume of algae liquid in subsequent disposal, and the 2nd, the floc density after flocculation and particle increase, and are conducive to centrifugal or filter.The flocculation technique of present stage is to add flocculation agent flocculation and the flocculation of anode loss electricity.The flocculation agent of gathering for the flocculation of micro-algae, mainly contains 4 kinds of iron aluminium salt based flocculating agent, organic polymer coargulator, natural synthetic flocculant and alkaline matter flocculation agents.Iron aluminium salt based flocculating agent mainly contains FeCl 3, AlCl 3, Fe 2(SO 4) 3, Al 2(SO 4) 3and derivative etc., after flocculation, iron and aluminum ions residues in algae mud and substratum, thereby causes quality of algal powder reduction and substratum to be difficult to reuse; Organic polymer coargulator, as there is the problem of residual difficult degradation monomer in polyacrylamide, easy contaminate environment; Natural synthetic flocculant as positive starch or chitosan still can not large-scale industrialization be used because cost is too high, and is performed poor in marine alga and the larger algae liquid of algae density; Use the alkali of alkaline matter flocculation agent to lure flocculation still to come with some shortcomings, as the non-nutrition metal ion accumulation of substratum and the loss of trophicity ion after flocculating, and be unfavorable for recycling of substratum.
In addition, existing electric flocculation plant Anodic loss electric flocculation technique is very immature, because conventionally use public network electric energy, energy consumption is higher, the loss entering in algae mud and anode iron plate or aluminium sheet are constantly corroded, makes the algae mud obtaining can not directly apply to the industries such as food, medicine and fishery feed; Thereby the chlorine that electricity flocculation Anodic produces destroys microalgae cell and reduces yield; Substratum non-nutritive metal ion forms generation irreversible change, is unfavorable for the recycling of substratum.Therefore, develop be a kind ofly easy to industrialization, flocculation plant efficient, low-cost, the substratum that can be recycled is significant.
Summary of the invention
The present invention is directed to the drawback of above-mentioned micro-algae harvesting technique, designed and developed a kind of sun power salt bridge electricity flocculation plant of gathering for micro-algae.This device lures 4 kinds of technology such as flocculation integrated in solar power system, electrolysis tech, electrodialysis and alkali, has environmental protection, efficient, less energy-consumption, advantage cheaply.
Sun power salt bridge electricity flocculation plant of gathering for micro-algae disclosed by the invention, is comprised of DC power system, Controlling System and salt bridge system.DC power system is comprised of solar module, AC power, power regulator, wherein solar module, AC power are connected with power regulator respectively, and be connected with microcomputer by power regulator, be subject to Microcomputerizedly, solar module and AC power combined and transform out direct current power; The positive-negative output end of power regulator connects respectively positive electrode and negative electrode, and wherein positive electrode connects the positive terminal of salt bridge, and negative electrode connects the cathode terminal of salt bridge, forms and is subject to Microcomputerized DC power system.When solar energy resources is sufficient, DC power system is exported high-quality direct current power by power regulator under the regulation and control of microcomputer MPPT maximum power point tracking algorithm, for the flocculation of salt bridge system; When solar energy resources is inadequate, it is direct current power that microcomputer and power regulator transform AC power, supplements the deficiency of solar DC electric power.
Controlling System is comprised of microcomputer, pH meter and available chlorine instrument, wherein pH meter inserts and inserts respectively cathode compartment and anolyte compartment, and be connected with microcomputer, available chlorine instrument inserts anolyte compartment and is connected with microcomputer, forms for monitoring the regulator control system of algae pond coagulation and anolyte compartment's state.
Salt bridge system is comprised of salt Biodge device and cathode terminal, positive terminal, and there is closed nut at upper end open place, is used for sealing salt bridge, has tongs to be used for getting rid of the bubble producing while pouring into salts solution.The positive terminal access anolyte compartment of salt bridge, cathode terminal access cathode compartment, adds electrolytic solution in anolyte compartment, and algae pond is cathode compartment, adds pending algae liquid.The salt bridge using is divided into without ion membranous type salt bridge and has two types of ion membranous type salt bridges: the indoor salts solution of directly filling containing 2-3% agar of salt while using without ion membranous type salt bridge, or agar or the sealing of electrochemistry porous diaphragm for salt bridge two ends, at the indoor salts solution of filling not containing agar of salt, and drive away bubble.Any two ends without ion membranous type salt bridge can be as cathode terminal or positive terminal, and the negative electrode that connects salt bridge cathode terminal adopts hydrogen-precipitating electrode net, as common wire netting, low-carbon (LC) steel mesh, stainless (steel) wire.The positive electrode that connects salt bridge positive terminal is determined on a case-by-case basis: when the salt material adding contains, enrich villaumite, as seawater, marine alga liquid, the solution etc. that contains magnesium chloride, industrial crude salt, anolyte compartment pours into seawater and adds excess amount of Ca CO 3during powder, positive electrode connects and adopts the corrosion resistant chloride electrode net of analysing; When the salt material adding is magnesium sulfate or the magnesium nitrate solution that concentration is greater than 0.5mol/L, when anolyte compartment adds the magnesium sulfate of 0.1-0.5mol/L or magnesium nitrate solution, positive electrode adopts the corrosion resistant oxygen electrode net of analysing.When use has ion membranous type salt bridge, sealing is close to agar or electrochemistry porous diaphragm and cationic membrane from the bottom up successively in salt bridge one end, as the cathode terminal of salt bridge; At the salt bridge the other end, use successively from the bottom up Bipolar Membrane and anionic membrane closed port, as the positive terminal of salt bridge; Between Bipolar Membrane and anionic membrane, leave adequate space as sour chamber, the acid producing for depositing electrolytic process, the Wei Yan chamber, space between cationic membrane and anionic membrane, for packing the salt material for throwing out into.Negative electrode adopts hydrogen-precipitating electrode net, as common wire netting, low-carbon (LC) steel mesh, stainless (steel) wire, indoor magnesium sulfate or the magnesium nitrate solution that adds concentration to be greater than 0.5mol/L of salt, while adding the magnesium sulfate of 0.1-0.5mol/L respectively or magnesium nitrate solution in the indoor and anolyte compartment of acid, positive electrode adopts the corrosion resistant oxygen electrode net of analysing.
Under power on condition, salt bridge system can improve constantly the pH value of algae liquid in cathode compartment, thereby causes the flocculation of algae liquid, and the solution generation acidifying simultaneously adding in anolyte compartment, obtains sodium hypochlorite solution or nitric acid, sulfuric acid.The sterilization in algae pond when sodium hypochlorite solution can be used for Cyclic culture, offsets departmental cost, and nitric acid and sulfuric acid can be used for washing away the precipitation in the rear algae mud of flocculation, obtain the algae mud that purity is higher, pH value when also adjustable substratum recycles.Precipitation elutant can be used as salt bridge salt material and reuses, or is widely used as nutritive salt.
Sun power salt bridge electricity flocculation plant of gathering for micro-algae provided by the present invention can guarantee that 2 hours flocculating rate are greater than 90% after electrolysis finishes, after 6 hours, flocculating rate is greater than 95%, subsidence rate is greater than 20cm/h, and concentration ratio is greater than 15 times, and flocculation cost is in 0.19-0.57 unit/kgbiomass left and right.While using the salt material that magnesium salts is salt bridge, the critical pH of flocculation, in 9.8-10.0 left and right, has avoided too high the damaging microalgae cell of pH.The described sun power salt bridge of gathering for micro-algae electricity flocculation plant is easy to amplify or improve, and each integral part is easy to assembly and disassembly.Anodic-cathodic material therefor is all corrosion-resistant, and the life-span is long, and cost is low.In flocculation process, the salt material in salt bridge is loss not, can be recycled, and in flocculation algae mud, there is no throw out, can guarantee algae mud quality.Can produce H 2and Cl 2, the potential possibility of offsetting departmental cost is provided.
Preferably, the described sun power salt bridge of gathering for micro-algae electricity flocculation plant, it is characterized in that: under power on condition, by salt bridge systemic effect, improve constantly the pH value of algae liquid in cathode compartment and form the precipitations such as calcium magnesium, thereby cause the flocculation of algae liquid, make the solution generation acidifying adding in anolyte compartment, the sodium hypochlorite solution of algae pond sterilization while obtaining can be used for Cyclic culture, or nitric acid or the sulfuric acid of pH value when obtaining can be used to washing away after flocculation precipitation in algae mud and can be used to regulate substratum to recycle simultaneously; And precipitation elutant to can be used as nutritive salt widely used.
Preferably, the described sun power salt bridge of gathering for micro-algae electricity flocculation plant, is characterized in that: in anolyte compartment, add electrolytic solution; Algae pond, as cathode compartment, adds pending algae liquid.
Preferably, the described sun power salt bridge of gathering for micro-algae electricity flocculation plant, is characterized in that: the negative electrode that connects salt bridge cathode terminal adopts hydrogen-precipitating electrode net, as common wire netting, low-carbon (LC) steel mesh, stainless (steel) wire; The positive electrode that connects salt bridge positive terminal adopts respectively according to the difference of adopted salt bridge type, salt material and electrolytic solution that anolyte compartment adds corrosion resistantly analyses chloride electrode net or analyses oxygen electrode net.
Preferably, the described sun power salt bridge of gathering for micro-algae electricity flocculation plant, is characterized in that: the salt bridge using is divided into without ion membranous type salt bridge and has two types of ion membranous type salt bridges; Salt bridge upper end open place has for sealing the closed nut and the flexible pipe and the tongs that are used for getting rid of bubble of salt bridge.
Preferably, the described sun power salt bridge of gathering for micro-algae electricity flocculation plant, is characterized in that: when adopting without ion membranous type salt bridge, and salt material contains and enriches villaumite, as the solution of magnesium chloride or industrial crude salt, seawater, marine alga liquid etc., in anolyte compartment, pour into seawater and add excess amount of Ca CO 3during powder, the positive electrode that connects salt bridge positive terminal adopts the corrosion resistant chloride electrode net of analysing; When adopting without ion membranous type salt bridge, and salt material is magnesium sulfate or magnesium nitrate solution that concentration is more than or equal to 0.5mol/L, and when anolyte compartment adds the magnesium sulfate of 0.1-0.5mol/L or magnesium nitrate solution, positive electrode adopts the corrosion resistant oxygen electrode net of analysing; When employing has ionic membrane salt bridge, indoor magnesium sulfate or the magnesium nitrate solution that adds concentration to be more than or equal to 0.5mol/L of salt, while adding the magnesium sulfate of 0.1-0.5mol/L respectively or magnesium nitrate solution in the indoor and anolyte compartment of acid, positive electrode adopts the corrosion resistant oxygen electrode net of analysing.
Preferably, the described sun power salt bridge of gathering for micro-algae electricity flocculation plant, it is characterized in that: the indoor salts solution of directly filling containing 2-3% agar of salt while using without ion membranous type salt bridge, or agar or the sealing of electrochemistry porous diaphragm for salt bridge two ends, at the indoor salt material pouring into not containing agar of salt, and drive away bubble; Any two ends without ion membranous type salt bridge can be as cathode terminal or positive terminal.
Preferably, the described sun power salt bridge of gathering for micro-algae electricity flocculation plant, it is characterized in that: use while having ion membranous type salt bridge, sealing is close to agar or electrochemistry porous diaphragm and cationic membrane from the bottom up successively in salt bridge one end, as the cathode terminal of salt bridge; At the salt bridge the other end, use successively from the bottom up Bipolar Membrane and anionic membrane closed port, as the positive terminal of salt bridge; Between Bipolar Membrane and anionic membrane, leave adequate space as sour chamber, the acid producing for depositing electrolytic process; Wei Yan chamber, space between cationic membrane and anionic membrane, for packing the salts solution for throwing out into.
Preferably, the described sun power salt bridge of gathering for micro-algae electricity flocculation plant, is characterized in that: the positive terminal access anolyte compartment of salt bridge, cathode terminal access cathode compartment; Positive electrode connects the positive terminal of salt bridge, and is connected with the positive output end of power regulator; Negative electrode connects the cathode terminal of salt bridge, and is connected with the negative output terminal of power regulator; Available chlorine instrument inserts anolyte compartment, and is connected with microcomputer, and pH meter inserts respectively anolyte compartment and is connected with cathode compartment and with microcomputer, forms for monitoring the regulator control system of algae pond coagulation and anolyte compartment's state.
Accompanying drawing explanation
The schematic diagram of the sun power salt bridge electricity flocculation plant that Fig. 1 gathers for micro-algae flocculation;
Fig. 2 is without the salt bridge apparatus structure schematic diagram of ionic membrane;
Fig. 3 has the salt bridge apparatus structure schematic diagram of ionic membrane;
Voltage and pH value change curve in Fig. 4 example 1 flocculation process;
In Fig. 5 example 1 flocculation process, flocculating rate changes column diagram;
Voltage and pH value change curve in Fig. 6 example 2 flocculation processes;
In Fig. 7 example 2 flocculation processes, flocculating rate changes column diagram.
Embodiment
Below in conjunction with Fig. 1-7, the present invention is described in further detail, to make those skilled in the art can implement according to this with reference to specification sheets word.
As shown in Figure 1, the invention provides a kind of sun power salt bridge electricity flocculation plant of gathering for micro-algae, by DC power system, Controlling System and salt bridge system, formed.DC power system forms 3 by solar module 1, AC power 2, power regulator, wherein solar module 1 is connected with power regulator 3 respectively with AC power 2, and be connected with microcomputer 4 by power regulator 3, be subject to microcomputer 4 regulation and control, solar module 1 and AC power 2 combined and transform out direct current power; The positive-negative output end of power regulator 3 connects respectively positive electrode 9 and negative electrode 10, and wherein positive electrode 9 connects the positive terminal of salt bridge 7, and negative electrode 10 connects the cathode terminal of salt bridge 7, forms the DC power system that is subject to microcomputer 4 regulation and control.When solar energy resources is sufficient, DC power system is exported high-quality direct current powers by power regulator 3 under the regulation and control of microcomputer 4 MPPT maximum power point tracking algorithms, for the flocculation of salt bridge system; When solar energy resources is inadequate, it is direct current power that microcomputer 4 transforms AC power with power regulator 3, supplements the deficiency of solar DC electric power.
Controlling System is comprised of microcomputer 4, pH meter 5 and available chlorine instrument 6, wherein pH meter 5 inserts anolyte compartment 8 and cathode compartment 11, and is connected with microcomputer 4, and available chlorine instrument 6 inserts anolyte compartment 8, and be connected with microcomputer 4, form for monitoring the regulator control system of cathode compartment 11 coagulations and anolyte compartment's 8 states.
Salt bridge system is comprised of salt Biodge device 7 and cathode terminal, positive terminal, and there is closed nut 12 at upper end open place, is used for deadend salt bridge, has tongs 15 to be used for getting rid of the bubble producing while pouring into salts solution.The positive terminal access anolyte compartment 8 of salt bridge, cathode terminal access cathode compartment 11, adds electrolytic solution in anolyte compartment 8, and algae pond, as cathode compartment 11, adds pending algae liquid, at pH under higher and sufficient magnesium ion condition, the algae liquid generation flocculating settling layering then of cathode compartment 11.
As shown in Figure 2, making method without ion membranous type salt bridge device, take magnesium salts as salt material be example: in without ionic membrane salt bridge salt chamber 22, pour into and contain the magnesium salt solution that 2-3% melts agar, after solidifying, in the cavity of upper end, add suitable electrolyte solution, and drive away bubble closed port by the tongs 16 on closed nut 12 and flexible pipe 15 thereof; Or at salt bridge two ends, with agar or electrochemistry porous diaphragm 14 sealing two ends, the magnesium salt solution without agar is poured into salt bridge, by the tongs 16 on closed nut 12 and flexible pipe 1 thereof, drive away bubble closed port.The cathode terminal of yin, yang electrode and salt bridge is connected with extremely narrow distance with positive terminal, and area is suitable with salt bridge electrode tip area.Salt bridge material is that PPR pipe fitting is made, and has fixed sturcture at the two poles of the earth port inner wall, can guarantee that agar or porous material or ionic membrane fixedly secure.
As shown in Figure 3, the making method that has ion membranous type salt bridge device: in one end of salt bridge from the bottom up successively with agar or electrochemistry porous diaphragm 14 and cationic membrane 17 closed ports, agar or electrochemistry porous diaphragm 14 and cationic membrane 17 are close to, as the cathode terminal of salt bridge; At the salt bridge the other end, use successively from the bottom up Bipolar Membrane 18 and anionic membrane 19 closed ports, as the positive terminal of salt bridge; Between Bipolar Membrane 18 and anionic membrane 19, leaving adequate space is sour chamber 20; Space in salt bridge between cationic membrane 17 and anionic membrane 19 is as the salt chamber 21 that has ion membranous type salt bridge device.
The using method of salt bridge system has three kinds, comprising: 1) when adopting without ion membranous type salt bridge, the salts solution adding contains and enriches magnesium chloride, as seawater, marine alga liquid, the solution etc. that contains magnesium chloride, industrial crude salt, pours into seawater and add excess amount of Ca CO in anolyte compartment 8 3powder, and give certain stirring, negative electrode adopts hydrogen-precipitating electrode net, and as common wire netting, low-carbon (LC) steel mesh, stainless (steel) wire, positive electrode adopts the corrosion resistant chloride electrode net of analysing.2) when adopting without ion membranous type salt bridge, the salts solution matter adding is magnesium sulfate or the magnesium nitrate solution that concentration is more than or equal to 0.5mol/L, when anolyte compartment 8 adds the magnesium sulfate of 0.1-0.5mol/L or magnesium nitrate solution, negative electrode adopts hydrogen-precipitating electrode net, as common wire netting, low-carbon (LC) steel mesh, stainless (steel) wire, positive electrode adopts the corrosion resistant oxygen electrode net 3 of analysing) use while having ion membranous type salt bridge, sealing is close to agar or electrochemistry porous diaphragm 14 and cationic membrane 17 from the bottom up successively in salt bridge one end, as the cathode terminal of salt bridge.At the salt bridge the other end, use successively from the bottom up Bipolar Membrane 18 and anionic membrane 19 closed ports, as the positive terminal of salt bridge.Between Bipolar Membrane 18 and anionic membrane 19, leave adequate space as sour chamber 20, for depositing the acid that electrolytic process produces, space between cationic membrane 17 and cathodic coating 19 is the salt chamber 21 that has ion membranous type salt bridge device, for packing the salts solution for throwing out into.Negative electrode adopts hydrogen-precipitating electrode net, as common wire netting, low-carbon (LC) steel mesh, stainless (steel) wire, having in the salt chamber 21 of ion membranous type salt bridge device adds concentration to be more than or equal to magnesium sulfate or the magnesium nitrate solution of 0.5mol/L, while adding the magnesium sulfate of 0.1-0.5mol/L respectively or magnesium nitrate solution in acid indoor 20He anolyte compartment 8, positive electrode adopts the corrosion resistant oxygen electrode net of analysing.
The described sun power salt bridge of gathering for micro-algae electricity flocculation plant, when solar energy resources is sufficient, DC power system is under the regulation and control of microcomputer 4 MPPT maximum power point tracking algorithms, by power regulator 3 output high-quality direct current powers, for the flocculation of salt bridge system; When solar energy resources is inadequate, it is direct current power that microcomputer 4 transforms AC power with power regulator 3, supplements the deficiency of solar DC electric power.Under power on condition, salt bridge system can improve constantly the pH value of algae liquid in cathode compartment 11, thereby causes the flocculation of algae liquid, and the solution generation acidifying simultaneously adding in anolyte compartment 8, obtains sodium hypochlorite solution 13 or nitric acid, sulfuric acid.The sterilization in algae pond when sodium hypochlorite solution 13 can be used for Cyclic culture, offsets departmental cost, and nitric acid and sulfuric acid can be used for washing away the precipitation in the rear algae mud of flocculation, obtain the algae mud that purity is higher, pH value when also adjustable substratum recycles.Precipitation elutant can be used as salt bridge salts solution and reuses, or is widely used as nutritive salt.
Example 1
The using method of salt bridge: ion exchanging surface is 6.2cm 2, middle filling be take salinity as 32%, the saturated sea water solution that contains 2-3% agar.After solidifying, with 450mA constant-current electrolysis.In cathode compartment, inject the micro-plan ball of 500mL eyespot algae culture, the absorbancy of culture under 680nm is 0.756, pH value=9.00, f/2 culture medium culturing; 500ml artificial seawater, pH value=8.00 are injected by anolyte compartment.Every 15 minutes, measure pH value and the output voltage of cathode compartment and anolyte compartment, and at each time point, do flocculation and measure, the 500mL algae liquid of 15,30,45,60,75,90,105 minutes of power taking solution respectively packs 500mL graduated cylinder into, places 2 hours, surveys flocculating rate.Flocculation calculation formula is: FR=1-(A-B)/A * 100%.Wherein A is that control group is placed after 2 hours the OD of bottom 1/3 height from liquid level to graduated cylinder 680value, B is that experimental group is placed after 2 hours the OD of bottom 1/3 height from liquid level to graduated cylinder 680value.
Flocculation result is as shown in Figure 4, Figure 5: voltage change is stable, and electrolytic process is stable, and algae liquid pH value located to rise to 11.2 left and right at 90 minutes, at 105 minutes, located to rise to 11.80.And the pH of anolyte compartment constantly reduces, from 5.5 left and right of 15 minutes, be down to 2.0 left and right of locating for 105 minutes.The acid solution solubilized CaCO of this pH value 3powder.And add excess amount of Ca CO in another group anolyte compartment 3in the experiment of powder seawater, the negative electrode pH in each treatment time, voltage are with respect to without CaCO 3powder group no significant difference, but anode pH remains on 6.0-7.5 left and right, thus proof Cl 2can be by CaCO 3powder changes into sodium hypochlorite solution.Flocculating rate was located at 30 minutes, reached and was stabilized in 93.8 ± 0.9%.
According to flocculating rate, compared with flocculation result high and that energy consumption is less, determine under 450mA, electrolysis 30 minutes is relatively suitable, and now power is 3.37Wh/L.With the solar panel of commercially available 20W, power, it is characterized in that: price is 100 yuans, working life 25 years, and in 25 years, guarantee 80% the electrical effect that supplies.With 4 hours average every days standard irradiance calculate, the maximum power that this cell panel can be supplied in working life is: 25 years * 365 days/year * 4 hours/large * 20W * 80%=584000Wh, these electric energy can be 584000Wh/3.37Wh/L=173293.7L for the volume of device flocculation algae liquid of the present invention.The cost of gathering that is every liter of algae liquid is 0.00057 yuan/L.Press the algae liquid density calculation of 1g/L, the cost of gathering of sun power salt bridge electricity flocculation plant is 0.57 yuan/kgbiomass, far below the centrifugal 4.35 yuan/kgbiomass gathering of bibliographical information, lower than the electric 1.74 yuan/kgbiomass flocculating of iron anode of bibliographical information.
Example 2:
With reference to example 1, only change most 150mA of electric current, other conditions are constant, and as shown in Figure 6: voltage change is stable, electrolytic process is stable.Flocculation result as shown in Figure 6, Figure 7: the flocculating rate at 90min place is the highest, reaches 87.4%, and now energy consumption is 1.33Wh/L.Solar panel with commercially available 20W is powered, and the cost of the algae liquid that flocculates is: 0.00019 yuan/L. is by the algae liquid density calculation of 1g/L, and the cost of gathering of sun power salt bridge electricity flocculation plant is 0.19 yuan/kgbiomass.
Although embodiment of the present invention are open as above, but it is not restricted to listed utilization in specification sheets and embodiment, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other modification, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend of describing.

Claims (10)

1. a sun power salt bridge electricity flocculation plant of gathering for micro-algae, is comprised of DC power system, Controlling System and salt bridge system; Wherein DC power system is comprised of solar module, AC power, power regulator, solar module, AC power are connected with power regulator, and be connected with microcomputer by power regulator, in DC power system, the positive-negative output end of power regulator connects respectively positive electrode and negative electrode, positive electrode jointed anode chamber, negative electrode connects cathode compartment, forms and is subject to Microcomputerized DC power system; Controlling System is comprised of microcomputer, pH meter and available chlorine instrument, and pH meter inserts anolyte compartment with available chlorine instrument and is connected with cathode compartment and with microcomputer; Salt bridge system is comprised of salt Biodge device and cathode terminal, positive terminal, and be connected with anolyte compartment with cathode compartment respectively, the positive electrode that connects salt bridge positive terminal adopts respectively according to the difference of adopted salt bridge type, salt material and electrolytic solution that anolyte compartment adds corrosion resistantly analyses chloride electrode net or analyses oxygen electrode net.
2. sun power salt bridge electricity flocculation plant of gathering for micro-algae according to claim 1, it is characterized in that: under power on condition, by salt bridge systemic effect, improve constantly the pH value of algae liquid in cathode compartment, thereby cause the flocculation of algae liquid, simultaneously in anolyte compartment or the sodium hypochlorite solution of algae pond sterilization while obtaining can be used for Cyclic culture, or nitric acid or the sulfuric acid of pH value when acidifying occurring obtaining can be used to washing away after flocculation precipitation in algae mud and can be used to regulate substratum to recycle; Precipitation elutant can be used as nutritive salt and is widely used.
3. sun power salt bridge electricity flocculation plant of gathering for micro-algae according to claim 1, is characterized in that: in anolyte compartment, add electrolytic solution; Algae pond, as cathode compartment, adds pending algae liquid.
4. sun power salt bridge electricity flocculation plant of gathering for micro-algae according to claim 1, is characterized in that: the negative electrode that connects salt bridge cathode terminal adopts hydrogen-precipitating electrode net.
5. sun power salt bridge electricity flocculation plant of gathering for micro-algae according to claim 4, it is characterized in that: the salt bridge using is divided into without ion membranous type salt bridge and has two types of ion membranous type salt bridges, use is the indoor salt material of directly filling containing 2-3% agar of salt during without ion membranous type salt bridge, or agar or the sealing of electrochemistry porous diaphragm for salt bridge two ends, at the indoor salt substance solution pouring into not containing agar of salt, and drive away bubble; Any one end without ion membranous type salt bridge can be as cathode terminal or positive terminal.
6. sun power salt bridge electricity flocculation plant of gathering for micro-algae according to claim 5, it is characterized in that: use while having ion membranous type salt bridge, sealing is close to agar or electrochemistry porous diaphragm and cationic membrane from the bottom up successively in salt bridge one end, as the cathode terminal of salt bridge; At the salt bridge the other end, use successively from the bottom up Bipolar Membrane and anionic membrane closed port, as the positive terminal of salt bridge; Between Bipolar Membrane and anionic membrane, leave adequate space as sour chamber, the acid producing for depositing electrolytic process; Wei Yan chamber, space between cationic membrane and anionic membrane, for packing the salt material for throwing out into.
7. sun power salt bridge electricity flocculation plant of gathering for micro-algae according to claim 4, is characterized in that: salt bridge upper end open place has for sealing the closed nut and the flexible pipe and the tongs that are used for getting rid of bubble of salt bridge.
8. sun power salt bridge electricity flocculation plant of gathering for micro-algae according to claim 6, it is characterized in that: when adopting without ion membranous type salt bridge, and salt material contains and enriches villaumite, the solution, seawater, the marine alga liquid that comprise magnesium chloride containing or industrial crude salt, pour into seawater and add excess amount of Ca CO in anolyte compartment 3during powder, the positive electrode that connects salt bridge positive terminal adopts the corrosion resistant chloride electrode net of analysing; When adopting without ion membranous type salt bridge, and salt material is magnesium sulfate or magnesium nitrate solution that concentration is more than or equal to 0.5mol/L, and when anolyte compartment adds the magnesium sulfate of 0.1-0.5mol/L or magnesium nitrate solution, positive electrode adopts the corrosion resistant oxygen electrode net of analysing; When employing has ion membranous type salt bridge, indoor magnesium sulfate or the magnesium nitrate solution that adds concentration to be more than or equal to 0.5mol/L of salt, while adding the magnesium sulfate of 0.1-0.5mol/L respectively or magnesium nitrate solution in the indoor and anolyte compartment of acid, positive electrode adopts the corrosion resistant oxygen electrode net of analysing.
9. sun power salt bridge electricity flocculation plant of gathering for micro-algae according to claim 1, is characterized in that: the positive terminal access anolyte compartment of salt bridge, cathode terminal access cathode compartment; Positive electrode connects the positive terminal of salt bridge, and is connected with the positive output end of power regulator; Negative electrode connects the cathode terminal of salt bridge, and is connected with the negative output terminal of power regulator; Available chlorine instrument inserts anolyte compartment, and is connected with microcomputer, and pH meter inserts respectively anolyte compartment and is connected with cathode compartment and with microcomputer, forms for monitoring the regulator control system of algae pond coagulation and anolyte compartment's state.
10. sun power salt bridge electricity flocculation plant of gathering for micro-algae according to claim 4, is characterized in that: described hydrogen-precipitating electrode net is common wire netting, low-carbon (LC) steel mesh or stainless (steel) wire.
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