CN210206460U - Algae liquid dewatering device based on dead-end forward osmosis technology - Google Patents
Algae liquid dewatering device based on dead-end forward osmosis technology Download PDFInfo
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- CN210206460U CN210206460U CN201920295791.3U CN201920295791U CN210206460U CN 210206460 U CN210206460 U CN 210206460U CN 201920295791 U CN201920295791 U CN 201920295791U CN 210206460 U CN210206460 U CN 210206460U
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Abstract
The utility model discloses a algae liquid dewatering device based on dead-end forward osmosis technology, the dewatering device comprises a osmosis device, a stirring device and a drawing liquid circulating system, the osmosis device comprises a forward osmosis membrane, an upper box body and a lower box body, the upper box body and the lower box body are mutually connected through a bolt, an algae liquid storage tank is arranged in the upper box body in a vertically through way, a drawing liquid circulating tank is arranged on the upper surface of the lower box body, a sealing ring is arranged between the upper box body and the lower box body, and the forward osmosis membrane is clamped between the upper box body and the lower box body; the stirring device comprises a driving motor, a connecting rod and a stirring paddle, wherein an output shaft of the driving motor is connected with one end of the connecting rod, and the other end of the connecting rod is connected with the stirring paddle at the bottom in the algae liquid storage tank; draw liquid circulation system and include peristaltic pump, connecting tube and draw the liquid memory, use this dewatering device and can make algae liquid can be with lower energy consumption, concentrate the filter cake layer that obtains lower moisture content.
Description
Technical Field
The utility model relates to an algae liquid dehydration field especially relates to an algae liquid dewatering device based on dead end just permeates the principle.
Background
Microalgae are lower plants, are various in types and extremely wide in distribution, and exist in water areas such as oceans, freshwater lakes and the like. Its unique chemical composition and structure make it the most promising raw material for biodiesel and biomass oil. The fossil energy storage amount is gradually reduced, the greenhouse gas emission is increasingly serious, and the development of microalgae bioenergy is considered to be the most promising alternative energy. Microalgae concentration and dehydration are one of the key technologies in microalgae bioenergy production.
The existing microalgae concentration and dehydration technology generally adopts a mode of concentration and dehydration serial treatment, and the concentration method mainly comprises a membrane filtration method, an air floatation method and a precipitation method, wherein the membrane filtration method is widely researched and applied because the membrane filtration method can not cause secondary pollution to algae liquid. The membrane filtration method has two operation modes of cross flow and dead end. The cross flow is that the water flow generates two component forces on the membrane surface, one is a normal force vertical to the membrane surface to enable water molecules to permeate the membrane surface, and the other is a tangential force vertical to the membrane surface to flush the interception of the membrane surface. The dead end, namely the water flow just generates a force vertical to the membrane surface above the membrane surface, and the intercepted particles form a pollution layer on the membrane surface along with the increase of the filtration time, so that the filtration resistance is increased.
In the existing technology of concentrating algae by using a membrane, a cross flow system is generally used for concentrating algae, namely, the side of an algae solution circulates the algae solution through a pipeline and a pump to form shearing force on the membrane surface, so that concentration polarization and membrane pollution are reduced. However, in the cross-flow system, a large amount of algae liquid is held in the pipeline on the algae liquid side, and the pipeline can only be in a fluid state for circulation, so that the algae liquid cannot be further circularly dehydrated after being concentrated to a certain concentration. Therefore, the existing membrane concentration algae technology only stays at the algae concentration level, the water content in the concentrated algae liquid is still higher than that, and further dehydration treatment is needed.
The dehydration stage mainly comprises a centrifugal dehydration method and a mechanical filter pressing method, and the water content in the algae liquid can be reduced to about 85 percent by further dehydration. Centrifugal dehydration is used for separating microalgae from a culture solution by utilizing the principle that the microalgae in the algae solution has different centrifugal force due to different specific weights of the microalgae and the culture solution, and the main problem of the centrifugal dehydration is that the energy consumption is overhigh; the mechanical filter pressing is to apply external pressure to the algae liquid, filter cloth or screen cloth in the filter pressing machine is provided with different permeation apertures to intercept and filter the microalgae in the algae liquid, and water molecules have smaller volume and are dehydrated through small holes. In addition, the two methods may be used for dewatering the algae liquid to incorporate a flocculating agent, which affects the purity of the additional products in the microalgae industry.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to holding the volume and can't further dewater because of the pipeline in the concentrated dehydration of current embrane method little algae technique, and current algae dewatering technique energy consumption is high, and dead end operation mode membrane pollutes technical problem such as serious in the technique is considered to the membrane, provide an algae liquid dewatering device based on dead end just osmosis technique, dead end operation mode can effectively reduce the holding volume of pipeline to algae liquid in the cross-flow operation mode, make algae liquid can further dewater to the lower filter cake layer of moisture content under the osmotic pressure drive of just permeating.
The utility model aims at realizing through the following technical scheme:
a algae liquid dewatering device based on a dead-end forward osmosis technology comprises an osmosis device, a stirring device and a drawing liquid circulating system, wherein the osmosis device comprises a forward osmosis membrane, an upper box body and a lower box body, the upper box body and the lower box body are mutually connected through bolts, an algae liquid storage tank is arranged in the upper box body in a vertically through mode, a drawing liquid circulating tank is arranged on the upper surface of the lower box body, a sealing ring is arranged between the upper box body and the lower box body, and the forward osmosis membrane is clamped between the upper box body and the lower box body;
the stirring device comprises a driving motor, a connecting rod and a stirring paddle, wherein an output shaft of the driving motor is connected with one end of the connecting rod, and the other end of the connecting rod is connected with the stirring paddle at the bottom in the algae liquid storage tank;
the drawing liquid circulating system comprises a peristaltic pump, a connecting pipeline and a drawing liquid storage device, rectangular grooves are formed in two sides in the drawing liquid circulating groove and communicated with the drawing liquid storage device through the connecting pipeline to form a circulating pipeline, and the peristaltic pump is used for providing circulating power for the circulating pipeline.
Further, the length, the width and the height of the algae liquid storage tank are respectively 10cm, 6cm and 60 cm.
Further, the length, the width and the height of the drawing liquid circulating groove are respectively 10cm, 6cm and 2 mm.
Compared with the prior art, the utility model discloses a beneficial effect that technical scheme brought is:
1. through adopting dead end operation mode, set up algae liquid holding tank above the membrane, reduced the holding of algae liquid side pipeline to algae liquid among the traditional cross-flow technique, and then made this device not only can be used for the algae concentration, can also make the algae liquid further dewater to the filter cake that contains lower moisture content.
2. By using the forward osmosis membrane with high flux recovery as a dehydration medium, even if a filter cake layer with low water content is formed in the system, the original flux can still be recovered through simple hydraulic flushing, and the reusability of the device is further improved.
3. The utility model discloses an use and just permeate the technique and need not external pressure, utilize the trend of membrane both sides osmotic pressure drive water for the membrane pollution of just permeating is lighter than other membrane consideration techniques, and the energy consumption is lower, and the flux resumes the height.
4. The utility model discloses not only confine little algae dehydration to, can also need obtain the field of high concentration multiple or high solute rejection rate at sludge dewatering, fruit juice concentration, sewage treatment etc..
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic top view of the drawing liquid circulation tank.
Reference numerals: 1-algae liquid storage tank, 2-drawing liquid circulation tank, 3-forward osmosis membrane, 4-driving motor, 5-connecting rod, 6-stirring paddle, 7-connecting pipeline, 8-drawing liquid storage, 9-peristaltic pump, 10-upper box body, 11-lower box body, 12-rectangular groove and 13-connecting hole
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in figure 1 and figure 2, a algae liquid dewatering device based on dead end forward osmosis technique, including penetrant unit, agitating unit and draw liquid circulation system, penetrant unit includes forward osmosis membrane 3, go up box 10 and lower box 11, go up the four corners homogeneous phase correspondence of box 10 and lower box 11 and be equipped with connecting hole 13, and through bolt interconnect, it is provided with algae liquid holding tank 1 to link up from top to bottom in the box 10 to go up, algae liquid that needs the dehydration adds algae liquid holding tank 1, stir reduction concentration polarization to algae liquid through agitating unit. The upper surface of the lower box body 11 is provided with a drawing liquid circulating groove 2, a sealing ring is arranged between the upper box body 10 and the lower box body 11, and the forward osmosis membrane 3 is clamped between the upper box body 10 and the lower box body 11;
the stirring device comprises a driving motor 4, a connecting rod 5 and a stirring paddle 6, wherein an output shaft of the driving motor 4 is connected with one end of the connecting rod 5, and the other end of the connecting rod 5 is connected with the stirring paddle 6; the paddle 6 is lowered to the lowest controllable position above the forward osmosis membrane 3. So that the concentration polarization of the algae liquid side of the positive permeable membrane component is reduced.
The drawing liquid circulating system comprises a peristaltic pump 9, a connecting pipeline 7 and a drawing liquid storage device 8, rectangular grooves 12 are formed in two sides in the drawing liquid circulating groove 2, the rectangular grooves 12 are communicated with the drawing liquid storage device 8 through the connecting pipeline 7 to form a circulating pipeline, and the peristaltic pump is used for providing circulating power for the circulating pipeline. The absorption liquid is driven by a peristaltic pump 9 to circularly dehydrate in the absorption liquid circulating tank 2.
The specific operation of algae liquid dehydration comprises the following steps:
1) assembling a penetration device: and placing the forward osmosis membrane between the algae liquid storage tank and the drawing liquid circulating tank, and fixing the forward osmosis membrane through bolts.
2) Preparing a drawing liquid: in this embodiment, 3L of a sodium chloride solution with a concentration of 5M is prepared as an extraction solution, and stored in an extraction solution storage 8 with a volume of 5L.
3) And adjusting the pH of the algae liquid, namely adjusting the pH of the algae liquid to be dehydrated to be neutral, wherein the pH range is 6-8.
4) And opening the peristaltic pump to enable the drawing liquid to be output from the drawing liquid storage device, pass through the drawing liquid circulation groove, and circulate back to the drawing liquid storage device after the drawing liquid circulation groove is filled with the drawing liquid. The flow rate of the draw solution in the draw solution circulation tank was 6.5 cm/s.
5) And adjusting the stirring device, adjusting the stirring paddle to the position of 1cm above the membrane surface, and turning on a switch of the device at the set rotating speed of 300 r/min.
6) Adding an algae solution: adding 300ml of microcystis aeruginosa with the pH value adjusted and the concentration of 0.1% into an algae liquid storage to ensure that the algae liquid starts to be dehydrated, and continuing to add the algae liquid to be dehydrated when the height of the algae liquid in the algae liquid storage is reduced to 1cm away from the membrane surface; .
7) Algae removal: and (4) after the liquid level of the liquid drawing storage is not changed, dewatering is finished, and a filter cake layer, namely the algae mud, is obtained on the surface of the membrane. And (4) turning off the stirring device and the peristaltic pump, and moving the stirring paddle out of the algae liquid storage. And (4) opening the bolt, removing the algae liquid storage device from the placing side, taking down the forward osmosis membrane, and scraping algae mud to the beaker by using a cover glass.
8) Membrane cleaning: and (3) placing the forward osmosis membrane in a measuring cylinder containing deionized water, and wiping the surface of the membrane by absorbent cotton to remove pollutants on the surface of the membrane so as to recover the flux to the original flux.
The water content of the algal mud obtained in this example was 75.29%, and the flux recovery rate was 99.57%.
The present invention is not limited to the above-described embodiments. The above description of the embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above embodiments are merely illustrative and not restrictive. Without departing from the spirit of the invention and the scope of the appended claims, the person skilled in the art can make many changes in form and detail within the teaching of the invention.
Claims (3)
1. A algae liquid dewatering device based on a dead-end forward osmosis technology is characterized by comprising an osmosis device, a stirring device and a drawing liquid circulating system, wherein the osmosis device comprises a forward osmosis membrane, an upper box body and a lower box body, the upper box body and the lower box body are mutually connected through bolts, an algae liquid storage tank is arranged in the upper box body in a vertically through mode, a drawing liquid circulating tank is arranged on the upper surface of the lower box body, a sealing ring is arranged between the upper box body and the lower box body, and the forward osmosis membrane is clamped between the upper box body and the lower box body;
the stirring device comprises a driving motor, a connecting rod and a stirring paddle, wherein an output shaft of the driving motor is connected with one end of the connecting rod, and the other end of the connecting rod is connected with the stirring paddle at the bottom in the algae liquid storage tank;
the drawing liquid circulating system comprises a peristaltic pump, a connecting pipeline and a drawing liquid storage device, rectangular grooves are formed in two sides in the drawing liquid circulating groove and communicated with the drawing liquid storage device through the connecting pipeline to form a circulating pipeline, and the peristaltic pump is used for providing circulating power for the circulating pipeline.
2. The algae liquid dewatering device based on the dead-end forward osmosis technology, according to claim 1, wherein the length, width and height of the algae liquid storage tank are 10cm, 6cm and 60cm respectively.
3. The algae liquid dewatering device based on the dead-end forward osmosis technology, wherein the length, the width and the height of the draw liquid circulation tank are 10cm, 6cm and 2mm respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920295791.3U CN210206460U (en) | 2019-03-08 | 2019-03-08 | Algae liquid dewatering device based on dead-end forward osmosis technology |
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| CN201920295791.3U CN210206460U (en) | 2019-03-08 | 2019-03-08 | Algae liquid dewatering device based on dead-end forward osmosis technology |
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