CN204848533U - Electricity flocculation - air supporting allies oneself with continuous harvesting apparatus of little algae of usefulness - Google Patents

Abstract

The utility model provides an electricity flocculation - air supporting allies oneself with continuous harvesting apparatus of little algae of usefulness, algae liquid entry with dissolve gas release mouth and be located below of electricity flocculation air supporting district, it is the electrolysis board to dissolve a gas release mouthful top, the electrolysis board is baffle no. 1 at the back, baffle no. 1 is distinguished for results at the back, the algae machine is scraped in the top in the results district, scrape the algae machine back lower place and store up the algae pond, it is located the algae bottom of the pool portion that stores up to receive the algae mouth, it is located results district bottom to arrange the cinder notch, the results district is a baffle no. 2 at the back, baffle no. 2 is a pool at the back, it is the gap to go out the pool middle part, upper portion is drainage pipe, the bottom is the dissolved gas pump water inlet, the dissolved gas pump inlet tube with dissolve gas intake -tube connection, dissolved gas pump is arrived in the reconnection, the gas pitcher is dissolved in the connection of dissolved gas pump upper end, the dissolved gas pump drain pipe is connected to the lower extreme, the dissolved gas pump drain pipe with dissolve gas release and mouthful link to each other. The utility model discloses having improved the results efficiency of little algae greatly, having had the small investment, area is little, and easy operation has the low energy consumption high efficiency, and the advantage of environmental protection is fit for large -scale production.

Description

A continuous harvesting device for microalgae combined with electrocoagulation and air flotation

technical field

The utility model belongs to the field of biotechnology and relates to a continuous microalgae harvesting device.

Background technique

The high cost of harvesting microalgae has always been one of the bottlenecks restricting its large-scale production. At present, the main methods for harvesting microalgae include membrane filtration, centrifugation and flocculation. Membrane filtration not only has very low production efficiency, but also the membrane is easily fouled and clogged, and the cost of membrane regeneration or renewal is also high. Therefore it is not suitable for industrialized production application. Centrifugation is a more commonly used method. Although it does not need to add other chemical reagents, the operation is complicated, the energy consumption is large, and the cost is high. The Chinese invention patent "a microalgae collection device for a tubular centrifuge (CN201220618371.2)" discloses a microalgae collection device for a tubular centrifuge. The liquid is introduced into a fast-rotating mesh sleeve, and the microalgae are left on the porous net through high-speed centrifugation, and the liquid is squeezed out of the mesh by centrifugal force. Although the device has a simple structure, it is provided with a detachable discharge sleeve, which improves the harvest rate of microalgae. However, the microalgae needs to be unloaded after centrifugation, and it takes time to disassemble, wash and install. Moreover, centrifugation is a process with huge energy consumption, which virtually increases the harvesting cost of microalgae, which is not conducive to industrial production.

The flocculation and sedimentation harvesting method of microalgae has also received attention in recent years. For example, the Chinese invention patent "A Microalgae Flocculation and Sedimentation Harvesting Method (CN201410453206.X)" discloses a method of using quaternary ammonium cationic starch as a flocculant combined with stirring It is a method of fully flocculating and settling microalgae to the bottom of the flocculation tank for collection. Although this method has simple process, short reaction time and good flocculation effect; however, too much flocculation dose is required, which will not only increase the cost, but also cause certain pollution to the microalgae harvest and water body, and each flocculation requires a long time. Standing time, can not be continuous production.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art, provide a microalgae electrocoagulation-air flotation combined microalgae continuous harvesting device, realize environment-friendly microalgae continuous harvesting, improve the harvesting efficiency of microalgae, reduce its Cost of production.

The utility model is achieved through the following technical solutions.

The device described in the utility model comprises an electric flocculation air flotation area, a harvesting area, a water outlet area and an air flotation system which are sequentially connected to each other.

The electroflocculation air flotation zone is composed of an algae liquid inlet (1), a dissolved air release port (2), an electrolytic plate (3) and a baffle plate (4).

The harvesting area is composed of an algae scraper (5), an algae storage pool (6), an algae collection port (7), a slag discharge port (8) and a second baffle plate (9).

The water outlet area is composed of an overflow port (17) and a drainpipe (18).

The air flotation system consists of dissolved air pump inlet pipe (10), butterfly valve (11), dissolved air inlet pipe (12), dissolved air pump (13), dissolved air tank (14), dissolved air pressure gauge (15), dissolved air Air pump liquid outlet pipe (16) is formed.

The connection relationship of each part of the utility model device is: the algae liquid inlet (1) and the dissolved air release port (2) are located at the bottom of the electrocoagulation air flotation area, and the electrolytic plate (3) is above the dissolved air release port (2). , the back of the electrolytic plate (3) is the baffle one (4), behind the baffle one (4) is the harvesting area, the algae liquid flows through the baffle one (4) and enters the harvesting area, and the top of the harvesting area is an algae scraper (5 ), the algae scraper (5) is behind the algae storage tank (6), the algae collection port (7) is located at the bottom of the algae storage tank (6), the slag discharge port (8) is located at the bottom of the harvesting area, and behind the harvesting area is the second baffle (9) , behind the baffle plate 2 (9) is the water outlet area, clean water enters the water outlet area through the gap below the baffle plate 2 (9), the middle part of the water outlet area is the overflow port (17), the upper part is the drainage pipe (18), and the bottom is the dissolved air pump inlet Water pipe (10) inlet, a butterfly valve (11) is installed on the water inlet pipe (10) of the dissolved air pump, clean water enters the air flotation system through the water inlet of the dissolved air pump (10), and the The air pipe (12) is connected, and then connected to the dissolved air pump (13). The upper end of the dissolved air pump (13) is connected to the dissolved air tank (14), and the lower end is connected to the dissolved air pump outlet pipe (16). A dissolved air pressure gauge (15) is installed, and the liquid outlet pipe (16) of the dissolved air pump is then connected to the dissolved air release port (2).

The operation process of the present utility model follows the steps.

Step 1) Preparation of the algae solution to be collected: export the algae solution from the microalgae photosynthetic reaction system at a certain flow rate, and at the same time export the bittern from the bittern water storage tank at a certain flow rate, and the mixture of the algae solution and the bittern water flows through a raceway pool to fully mix , into the deep groove at the end of the runway pool (for the algae liquid to be harvested); the purpose of fully mixing the algae liquid with the bittern is to increase the conductivity of the algae liquid and reduce the energy consumption required for harvesting.

Step 2) Microalgae flocculation: the algae to be harvested are pumped from the algae liquid inlet (1) and rise to the electrolytic plate (3), where they are flocculated by the iron hydroxide colloid released from the electrode.

Step 3) Flocculation microalgae air flotation harvesting: the microalgae cell clusters that are flocculated and reunited are adsorbed and floated by the microbubbles released from the dissolved air release port (2), and the bursting of the microbubbles in the process of rising produces force to promote the microalgae cell clusters Further agglomeration, the microalgae cell mass flows through the baffle 1 (4) along with the main flow into the harvesting area, rises to the liquid surface, and the microalgae on the liquid surface is scraped into the algae storage tank (6) by the algae scraper (5), and the collected algal pulp The algae is collected through the algae collection port (7) at the bottom of the algae storage tank (6), and sent to the next step of dehydration and drying process.

Step 4) Clean water discharge: The clean water at the bottom of the harvesting area enters the water outlet area through the gap at the lower part of the baffle plate 2 (9). If the liquid level is high, the clean water is discharged through the overflow port (17) and the drain pipe (18) (clean water discharge The speed is balanced with the inflow speed of the algae liquid to be collected), most of the water enters the air flotation system through the air-dissolving pump inlet pipe (10) and mixes with the air-dissolving air inlet pipe (12) and enters the air-dissolving system through the air-dissolving pump (13). The tank (14) is temporarily stored, and part of it is connected to the dissolved air release port (2) through the dissolved air pump outlet pipe (16) and enters the electrocoagulation air flotation area to maintain a stable water level in the device.

The utility model has the advantage that.

(1) The utility model creatively combines the two processes of electrocoagulation and air flotation separation, and completes them in the same device, which saves some tedious and unnecessary steps and greatly improves the harvesting efficiency of microalgae. The device requires less investment, occupies a small area, is simple to operate, has the advantages of low energy consumption, high efficiency, and environmental protection, and is convenient for large-scale production.

(2) The electrolytic plate of the device is made of iron, and the electrolytic plate is immersed in the bottom of the liquid surface to drill holes. The drilling can increase the contact area between the electric plate and the water body and improve the electrolysis efficiency. Moreover, iron is not as toxic as aluminum, and the price of iron is only about a quarter of that of aluminum.

(3) The dissolved air release port of the dissolved air flotation machine is composed of multiple small nozzles, so that the microbubbles cover the electrolytic plate with the largest area. The purpose is to ensure that the microbubbles generated by the dissolved air flotation fully contact the flocs, and the It is brought to the surface of water bodies.

(4) Bitter brine can be added to increase the conductivity, and the magnesium hydroxide flocs produced by electrolysis have strong adsorption capacity.

Description of drawings

Fig. 1 is the structural representation of the utility model equipment.

Fig. 2 is the right side view of the utility model equipment.

In the figure: A is the electrocoagulation air flotation area, B is the harvest area, C is the water outlet area, and D is the air flotation system. 1 is the algae liquid inlet, 2 is the dissolved air release port, 3 is the electrolytic plate, 4 is the baffle, 5 is the algae scraper, 6 is the algae storage pool, 7 is the algae collection port, 8 is the slag discharge port, and 9 is the baffle 2. 10 is the water inlet pipe of the dissolved air pump, 11 is the butterfly valve, 12 is the dissolved air inlet pipe, 13 is the dissolved air pump, 14 is the dissolved air tank, 15 is the dissolved air pressure gauge, 16 is the dissolved air pump outlet pipe, and 17 is the overflow port , 18 is drainpipe.

Detailed ways

The utility model will be further described in conjunction with the accompanying drawings.

The utility model device is shown in accompanying drawing 1 and accompanying drawing 2.

The microalgae harvesting method of the utility model is to export the algae liquid from the microalgae photosynthetic reaction system at a certain flow rate of 5L/MIN, and simultaneously export the bittern from the bittern water storage tank at a flow rate of 0.01L/MIN, and the algae liquid and bittern The brine mixture flows through a runway pool and is fully mixed, and enters the deep groove at the end of the runway pool, which is for the algae liquid to be collected; start the electric flocculation-air flotation combined microalgae continuous harvesting device of the utility model, and the algae liquid to be collected Enter the electroflocculation air flotation area through the algae liquid inlet 1 at a flow rate of 5.01L/MIN. When the liquid level in the device is just below the electrolytic plate, start the electroflocculation and air flotation device, and adjust the voltage of the electroflocculation device to 12 volts and current. The intensity is 20 amps, adjust the butterfly valve 11 of the water inlet pipe of the dissolved air pump and the air inlet valve of the dissolved air pump, and observe the air intake rate meter of the dissolved air pump to control the water intake and dissolved air rate, so that the microbubbles are in a dense milky state, and the microalgae flocculate and float in the liquid. The surface, and flow through the harvesting area, start the algae scraper through the equipment control box, scrape the algae flocs into the algae storage tank, and then harvest the microalgae through the algae collection port, and send it to the subsequent processing procedure. The clear water at the bottom of the harvesting area enters the water outlet area through the gap at the lower part of the baffle plate 29. If the liquid level is high, the clear water is discharged through the overflow port 17 and the drain pipe 18. The flow rate of the clear water discharge is controlled at about 5.00L/MIN, so that the liquid The surface has been maintained in the working area of the algae scraper.

Claims (1)

1. A continuous harvesting device for microalgae combined with electrocoagulation-air flotation, which is characterized in that it includes an electroflocculation air flotation area, a harvest area, a water outlet area and an air flotation system connected successively; the electrocoagulation air flotation area is fed by algal liquid (1), dissolved air release port (2), electrolytic plate (3), baffle one (4); the harvesting area consists of algae scraper (5), algae storage tank (6), algae collection port (7), slag discharge mouth (8), baffle plate two (9); the water outlet area is composed of overflow port (17), drain pipe (18); the air flotation system is composed of dissolved air pump inlet pipe (10), butterfly valve (11), dissolved air inlet pipe (12), dissolved air pump (13), dissolved air tank (14), dissolved air pressure gauge (15), dissolved air pump liquid pipe (16); The algae liquid inlet (1) and the dissolved air release port (2) are located at the bottom of the electroflocculation air flotation area, the electrolytic plate (3) is above the dissolved air release port (2), and the baffle is behind the electrolytic plate (3) One (4), behind the baffle one (4) is the harvesting area, the algae liquid flows through the baffle one (4) and enters the harvesting area, the top of the harvesting area is the algae scraper (5), and the bottom of the algae scraper (5) is The algae storage tank (6), the algae collection port (7) is located at the bottom of the algae storage tank (6), the slag discharge port (8) is located at the bottom of the harvesting area, behind the harvesting area is the second baffle (9), behind the second baffle (9) is the water outlet area , clean water enters the water outlet area through the gap under the second baffle (9), the middle of the water outlet area is the overflow (17), the upper part is the drainage pipe (18), the bottom is the water inlet of the dissolved air pump (10), and the water inlet of the dissolved air pump A butterfly valve (11) is installed on (10), and the clean water enters the air flotation system through the water inlet of the dissolved air pump (10). The air pump (13), the upper end of the dissolved air pump (13) is connected to the dissolved air tank (14), the lower end is connected to the dissolved air pump outlet pipe (16), and the dissolved air pump outlet pipe (16) is equipped with a dissolved air pressure gauge (15). The liquid outlet pipe (16) of the air pump is then connected with the dissolved air release port (2).