CN102746994A - Electrical flocculation/coagulation method used for collecting microalgae - Google Patents
Electrical flocculation/coagulation method used for collecting microalgae Download PDFInfo
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- CN102746994A CN102746994A CN2012102574228A CN201210257422A CN102746994A CN 102746994 A CN102746994 A CN 102746994A CN 2012102574228 A CN2012102574228 A CN 2012102574228A CN 201210257422 A CN201210257422 A CN 201210257422A CN 102746994 A CN102746994 A CN 102746994A
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- little algae
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Abstract
The invention provides an electrical flocculation/coagulation method used for collecting microalgae, relating to a method for collecting microalgae. The invention needs to solve the problem that the traditional microalgae collection method can not simultaneously meet the requirements of high collection rate and low energy consumption. The method comprises the following steps of: (1) respectively placing a positive electrode plate and a negative electrode plate on both sides inside a container, and connecting the positive electrode plate and the negative electrode plate with a power source; and (2) loading a microalgae culture solution with initial density lower than 1 g/L into the container, switching on the power source, adjusting the initial pH value, the current density and the agitation speed, and collecting microalgae after flocculation is finished. The microalgae collection rate by using the method can reach more than 98%, and the energy consumption for collection is 0.5-2 kWh/kg. The method is used for collecting microalgae.
Description
Technical field
The present invention relates to a kind of method of collecting little algae.
Background technology
Little algae is one type of algae that form is small, and major part is aquatic eukaryote, is made up of unicellular or many cells.Little algae is of a great variety, distributes extensively, has fast growth, the characteristics that yield per unit is high.Little algae has very high comprehensive utilization value on the one hand, and the large-scale industrialized production prospect is considerable, and on the other hand, algae type eutrophication has been brought many harm and inconvenience for human productive life again.The improvement of industrialization production of little algae and algae type eutrophication is all had higher requirement to the collection technique of little algae, and therefore, exploration more efficiently, little algae collection technique is imperative cheaply.Little in recent years algae biofuel has obtained the extensive concern of countries in the world; In the production cost of biofuel, raw material accounts for the largest percentage, generally between 70%～80%; Little algae is as the raw material of bioenergy; Be suggested already and through experimental verification, cultivate and costs such as collection, also can't be at war with fossil energy etc. but be subject to.
The bright prospects of little algae industry all mean efficiently, little algae collection method is very necessary and significant cheaply.This be because; The fast development of little algae industry makes little algae large-scale industrialized production become inexorable trend on the one hand; And little algae collection process is as one of important step of little algae industrial chain, and the raising of its collection effciency and the reduction of compiling costs all have important promoter action to whole little algae industry.Especially in little algae system oil industry, collect the concentrate drying link and account for total cost 20～30%, but the cost savings space more than 99.75% is arranged.
The collection method of present little algae mainly contains centrifugal collection method, flocculence and filtration method.Though centrifugal collecting method can reach the collection rate near 100%, because the power of whizzer is big, current consumption is big, has the high shortcoming of energy consumption.Flocculence is to use inorganic flocculating agent to flocculate and collects little algae, and this method and filtration method all have advantage of low energy consumption, but collection rate is low, is merely about 90%.
Summary of the invention
The present invention will solve the collection method of present little algae can't satisfy collection rate height and the low problem of energy consumption simultaneously, and a kind of electricity flocculation/coagulation method that is used to collect little algae is provided.
The present invention is used to collect the electricity flocculation/coagulation method of little algae, carries out according to the following steps: one, the both sides in container are placed positive electrode plate and negative electrode plate respectively, and positive electrode plate is connected with power supply with negative electrode plate; Two, be that micro algae culturing liquid below the 1g/L is packed in the container with initial density, energized is regulated original ph to 5～8 then, and current density is 0.42～2.05mA/cm
2, stirring velocity is 40～60r/min, and flocculation time is 20～60min, and flocculation finishes the back and collects little algae, promptly accomplishes; Wherein the said container of step 1 is Glass Containers, plastic containers, earthenware porcelain receptacle or concrete container.
With aluminium matter battery lead plate is that example is explained principle of the present invention:
Following electrolytic reaction takes place in aluminium matter battery lead plate under galvanic effect:
Anode: Al → Al
3++ 3e
-
2H
2O→O
2+4H
++4e
-
In the solution:
Negative electrode: 2H
2O+2e
-→ H
2+ 2OH
-
The hydration Al that anode discharged
3+In solution, combine with electronegative frustule, in the electric charge of frustule, improved that frustule collides each other and the bonded possibility, formed Al (OH) in the solution
3Then through adsorption bridging effect and volume sweep, net catch the effect with frustule form flco jointly.The microbubble that is generated in the electrolysis process then is adsorbed on the flco, thereby flco is floated to liquid level, forms to contain algae flco layer.Collect the flco layer and promptly realize little algae collection.
Use the little algae collection rate of method of the present invention can reach more than 98%, collect energy consumption and hang down at 0.5～2kWh/kg.The present invention collects the method for little algae and compares with centrifuging, conventional flocculence, filtration method, has the high and low advantage of energy consumption of collection effciency simultaneously.
Description of drawings
Fig. 1 is the collection rate change curve in time of the chlorella of embodiment six to nine; Fig. 2 is that embodiment six energy consumption that chlorella is collected during different densities in nine is schemed with water outlet pH.
Embodiment
Technical scheme of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: this embodiment is used to collect the electricity flocculation/coagulation method of little algae, carries out according to the following steps: one, the both sides in container are placed positive electrode plate and negative electrode plate respectively, and positive electrode plate is connected with power supply with negative electrode plate; Two, be that micro algae culturing liquid below the 1g/L is packed in the container with initial density, energized is regulated original ph to 5～8 then, and current density is 0.42～2.05mA/cm
2, stirring velocity is 40～60r/min, and flocculation time is 20～60min, and flocculation finishes the back and collects little algae, promptly accomplishes; Wherein the said container of step 1 is Glass Containers, plastic containers, earthenware porcelain receptacle or concrete container.
The said initial density of step 2 is that the micro algae culturing liquid below the 1g/L is meant that the initial density of little algae in the micro algae culturing liquid is below the 1g/L.
Embodiment two: what this embodiment and embodiment one were different is: the material of battery lead plate described in the step 1 is aluminium, duraluminum, iron or iron alloy.Other is identical with embodiment one.
Embodiment three: what this embodiment was different with embodiment one or two is: little algae described in the step 2 is the unicellular algae below the particle diameter 100 μ m.Other is identical with embodiment one or two.
Embodiment four: what this embodiment was different with one of embodiment one to three is: the said power supply of step 2 is direct supply or AC power.Other is identical with one of embodiment one to three.
Embodiment five: what this embodiment was different with one of embodiment one to four is: the mode of the little algae of the said collection of step 2 is collected little algae for using dreg scraper, perhaps the clear liquor of container bottom is extracted out and is realized that little algae collects.Other is identical with one of embodiment one to four.
Embodiment six: this embodiment is used to collect the electricity flocculation/coagulation method of little algae, carries out according to the following steps: one, the both sides of beaker are placed positive electrode plate and negative electrode plate respectively, and positive electrode plate is connected with power supply with negative electrode plate; Two, be that the chlorella nutrient solution of 0.24g/L is packed in the beaker with initial density, connect direct supply then, regulate original ph to 5, current density is 0.42mA/cm
2, stirring velocity is 50r/min, and flocculation time is 20min, and flocculation finishes the back and collects little algae.
The said battery lead plate of this embodiment step 1 is that aluminium content is 99.60% aluminium sheet.
The collection rate of this embodiment chlorella reaches more than 99%, and in the flco of collecting, algae content surpasses 70%, collects energy consumption and is merely 1.004kWh/kg (dried algae is heavy).
For verifying the effect of this embodiment, carry out following simultaneous test:
1, make flocculation agent with Tai-Ace S 150, dosage is 0.25mmol/L, collects the chlorella nutrient solution of same initial density, stirs 1min fast with 200r/min, stirs 10min at a slow speed with 50r/min again, behind the quiet heavy 15min, collects little algae, and collection rate is about 95%.
2, with centrifuging the chlorella nutrient solution of same initial density is collected, centrifugal 10min under 4000r/min collects little algae, and collection rate can reach 100%, but energy consumption is 15.971kWh/kg then considerably beyond the collection energy consumption of this embodiment.
Embodiment seven: this embodiment is used to collect the electricity flocculation/coagulation method of little algae, carries out according to the following steps: one, the both sides of beaker are placed positive electrode plate and negative electrode plate respectively, and positive electrode plate is connected with power supply with negative electrode plate; Two, be that the chlorella nutrient solution of 0.48g/L is packed in the beaker with initial density, connect direct supply then, regulate original ph to 5, current density is 0.48mA/cm
2, stirring velocity is 50r/min, and flocculation time is 25min, and flocculation finishes the back and collects little algae.
The said battery lead plate of this embodiment step 1 is that aluminium content is 99.60% aluminium sheet.
The collection rate of this embodiment chlorella reaches more than 99%, and in the flco of collecting, algae content surpasses 70%, collects energy consumption and is merely 1.3kWh/kg (dried algae is heavy).
Embodiment eight: this embodiment is used to collect the electricity flocculation/coagulation method of little algae, carries out according to the following steps: one, the both sides of beaker are placed positive electrode plate and negative electrode plate respectively, and positive electrode plate is connected with power supply with negative electrode plate; Two, be that the chlorella nutrient solution of 0.72g/L is packed in the beaker with initial density, connect direct supply then, regulate original ph to 5, current density is 0.86mA/cm
2, stirring velocity is 50r/min, and flocculation time is 30min, and flocculation finishes the back and collects little algae.
The said battery lead plate of this embodiment step 1 is that aluminium content is 99.60% aluminium sheet.
The collection rate of this embodiment chlorella reaches more than 99%, and in the flco of collecting, algae content surpasses 70%, collects energy consumption and is merely 1.48kWh/kg (dried algae is heavy).
Embodiment nine: this embodiment is used to collect the electricity flocculation/coagulation method of little algae, carries out according to the following steps: one, the both sides of beaker are placed positive electrode plate and negative electrode plate respectively, and positive electrode plate is connected with power supply with negative electrode plate; Two, be that the chlorella nutrient solution of 0.96g/L is packed in the beaker with initial density, connect direct supply then, regulate original ph to 5, current density is 1.33mA/cm
2, stirring velocity is 50r/min, and flocculation time is 40min, and flocculation finishes the back and collects little algae.
The said battery lead plate of this embodiment step 1 is that aluminium content is 99.60% aluminium sheet.
The collection rate of this embodiment chlorella reaches more than 99%, and in the flco of collecting, algae content surpasses 70%, collects energy consumption and is merely 1.85kWh/kg (dried algae is heavy).
Change curve is as shown in Figure 1 in time for the collection rate of the chlorella of embodiment six to nine;
expression chlorella density is 0.24g/L;
expression chlorella density is 0.48g/L;
expression chlorella density is 0.72g/L, and
expression chlorella density is 0.96g/L.Can find out that the little algae to different cell densities all can reach collection rate preferably.
Chlorella is collected during different densities in nine energy consumption and water outlet pH are as shown in Figure 2 for embodiment six;
representes energy consumption,
expression water outlet pH.Can know that collecting energy consumption is 0.5～2kWh/kg.The water outlet pH that chemical coagulation is collected behind little algae generally has bigger fluctuation, and water outlet pH is 6～9 in the sewage drainage standard, and data show that the water outlet pH fluctuation of the inventive method is less, and near the sewage drainage standard requirement.
Claims (5)
1. electricity flocculation/coagulation method that is used to collect little algae; It is characterized in that being used to collect the electricity flocculation/coagulation method of little algae; Carry out according to the following steps: one, the both sides in container are placed positive electrode plate and negative electrode plate respectively, and positive electrode plate is connected with power supply with negative electrode plate; Two, be that micro algae culturing liquid below the 1g/L is packed in the container with initial density, energized is regulated original ph to 5～8 then, and current density is 0.42～2.05mA/cm
2, stirring velocity is 40～60r/min, and flocculation time is 20～60min, and flocculation finishes the back and collects little algae, promptly accomplishes; Wherein the said container of step 1 is Glass Containers, plastic containers, earthenware porcelain receptacle or concrete container.
2. a kind of electricity flocculation/coagulation method that is used to collect little algae according to claim 1, the material that it is characterized in that battery lead plate described in the step 1 is aluminium, duraluminum, iron or iron alloy.
3. a kind of electricity flocculation/coagulation method that is used to collect little algae according to claim 1 and 2 is characterized in that little algae described in the step 2 is the unicellular algae below the particle diameter 100 μ m.
4. a kind of electricity flocculation/coagulation method that is used to collect little algae according to claim 3 is characterized in that the said power supply of step 2 is direct supply or AC power.
5. a kind of electricity flocculation/coagulation method that is used to collect little algae according to claim 4, the mode that it is characterized in that the little algae of the said collection of step 2 is collected little algae for using dreg scraper, perhaps the clear liquor of container bottom is extracted out and is realized that little algae collects.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104370351A (en) * | 2014-11-27 | 2015-02-25 | 中国科学院天津工业生物技术研究所 | Membrane electroflocculation device and method for microalgae harvesting by utilizing same |
| CN105505780A (en) * | 2015-12-08 | 2016-04-20 | 沈阳化工研究院有限公司 | Microalgae collecting method and microalgae |
| CN110540268A (en) * | 2019-04-18 | 2019-12-06 | 贵州民族大学 | Electric field algae removal structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055719A (en) * | 1990-02-28 | 1991-10-30 | 威尔弗雷德·安东尼·默雷尔 | Water purifying system |
| CN2469002Y (en) * | 2001-03-28 | 2002-01-02 | 郭中民 | Equipment for treating water for culturing fish using circulation to keep its quality |
| CN1864480A (en) * | 2006-04-21 | 2006-11-22 | 褚忠勇 | Cultivation water purifier |
| CN102803149A (en) * | 2009-06-24 | 2012-11-28 | 阿奎泰克水净化系统有限公司 | Water treatment method and system |
-
2012
- 2012-07-24 CN CN2012102574228A patent/CN102746994A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055719A (en) * | 1990-02-28 | 1991-10-30 | 威尔弗雷德·安东尼·默雷尔 | Water purifying system |
| CN2469002Y (en) * | 2001-03-28 | 2002-01-02 | 郭中民 | Equipment for treating water for culturing fish using circulation to keep its quality |
| CN1864480A (en) * | 2006-04-21 | 2006-11-22 | 褚忠勇 | Cultivation water purifier |
| CN102803149A (en) * | 2009-06-24 | 2012-11-28 | 阿奎泰克水净化系统有限公司 | Water treatment method and system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104370351A (en) * | 2014-11-27 | 2015-02-25 | 中国科学院天津工业生物技术研究所 | Membrane electroflocculation device and method for microalgae harvesting by utilizing same |
| CN104370351B (en) * | 2014-11-27 | 2016-03-02 | 中国科学院天津工业生物技术研究所 | A kind of film electricity flocculation plant and utilize this device to carry out the method for microalgae recovery |
| CN105505780A (en) * | 2015-12-08 | 2016-04-20 | 沈阳化工研究院有限公司 | Microalgae collecting method and microalgae |
| CN105505780B (en) * | 2015-12-08 | 2019-10-11 | 沈阳化工研究院有限公司 | A kind of Microalgae collection method and microalgae |
| CN110540268A (en) * | 2019-04-18 | 2019-12-06 | 贵州民族大学 | Electric field algae removal structure |
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Application publication date: 20121024 |