CN105597416A - Method and device for air-backwashing and continuously concentrating algae slurry - Google Patents

Abstract

The invention discloses a method and device for continuously concentrating algae pulp by air backwashing. The steps are: <b>1</b><b>)</b> Thin algal pulp is concentrated into thick algal pulp, , the dilute algae pulp enters the reed-shaped drum; B. Filtration and dehydration; C. Cutting algae; D. Washing algae; E. Discharging: forming thick algal pulp; 1. Feed, concentrated algae slurry enters the long drum; B. Filtration and dehydration; C. Cutting algae; D. Washing algae; E. Discharging: forming semi-solid algae mud; The outlet of the primary concentrator is connected to the feed port of the secondary concentrator through pipelines, the air backwashing system is connected to the inlets of the primary concentrator and the secondary concentrator through gas pipes, and the automatic electric control system is separated by cables. It is connected with the drum drive motor of the concentrator, the drum drive motor, and the drive motor of the air backwashing device. The method is easy to implement, and no flocculant is added during the concentration process. The separation efficiency of algal water is high, and it can continuously feed water, separate continuously, and discharge algae mud continuously.

Description

A method and device for continuously concentrating algae pulp by air backwashing

technical field

The invention belongs to the technical field of water algae concentration and environmental protection. More specifically, it relates to a method for continuously concentrating algae pulp by air backwashing, and also relates to a device for continuously concentrating algae pulp by air backwashing, which is suitable for water filtration and dehydration of algae pulp by two-stage concentrators, and blown by compressed air backwashing systems. Remove algae and become semi-solid phase algae mud that can be directly bagged.

Background technique

There are many methods to control cyanobacteria blooms in lakes, including physical, chemical and biological methods. Among them, physical methods such as mechanical salvage and cyanobacteria collection are currently methods that can directly remove cyanobacteria blooms on lake water surfaces without negative effects. The method of mechanical salvage and cyanobacteria collection will produce a large amount of algae pulp, which contains a large amount of water. The water content of living cyanobacteria cells is about 90%, and the water content of algae pulp can generally reach 95%-99%. Excessive moisture content is not only extremely unfavorable to the transportation and storage of algal pulp, but also brings many difficulties to the subsequent disposal of algal pulp. Algae pulp is rich in nitrogen and phosphorus nutrients, and its vegetable protein content is high, so it is easy to spoil, emits bad smell, and has the risk of secondary pollution. The dehydration performance of algae pulp is poor, and the dehydration methods such as conventional vibration filtration, inclined sieve filtration, vacuum suction filtration, and press filtration have poor results. In order to speed up the dehydration of the algae pulp, the method of adding flocculant to cooperate with the decanter centrifuge is usually adopted (such as patent CN200710066435.6), or the method of adding flocculant to cooperate with the belt filter press and the decanter centrifuge after the second filtration of the algae pulp (such as patent CN200810048488.X). However, the method of adding flocculants not only increases the cost, but also makes the algae mud not conducive to the subsequent resource utilization. Therefore, for a long time, the difficult problem of algae pulp has become an important factor restricting the control of cyanobacteria blooms in lakes.

Invention content:

The object of the present invention is to provide a method for continuously concentrating algae slurry by air backwashing, which is easy to implement and easy to operate, no flocculant is added in the concentration process, and the product is semi-solid phase algae slurry that can be directly bagged.

Another object of the present invention is to provide an air backwashing device for continuously concentrating algae pulp, which has a simple structure, is convenient to use, and has high separation efficiency of algae water.

In order to achieve the above object, the present invention adopts the following technical measures:

The concept of the present invention is to adopt a fast-rotating reed-shaped drum structure, which is a compact type designed for the characteristics of general dilute algae pulp with high water content, low viscosity, and easy to filter water through the filter screen. Concentration device. Under the condition of faster speed, in addition to the dehydration by gravity, the dehydration is accelerated by centrifugal force, and the dehydration by air flushing shear force (the water adhered to the filter due to capillary action encounters the compressed air ejected at high speed, and some It will reflect and splash outside the drum to speed up the removal of water), and the effects of the three are superimposed to form efficient dehydration. The elongated drum structure with slow rotation speed is designed for the low moisture content and high viscosity of the thick algae pulp, the slow water filtration by the filter screen, and the need to provide a large filter surface. The shaftless spiral structure installed in the drum also prolongs the contact residence time of the algae pulp and the filter screen when rotating. The air backwashing device can continuously wash off the algae adhered to the filter to form a new clean filter surface, making it capable of filtering water again, and at the same time, the air has a drying effect. Under the above several effects, the water in the algae pulp is removed more and more thoroughly, and finally a semi-solid phase algae mud that can be directly bagged is formed.

A method for continuously concentrating algae pulp by air backwashing, the steps are:

1. Dilute algae pulp is concentrated into thick algae pulp: dilute algae pulp enters the fast-rotating reed-shaped drum, the drum is covered with a filter, and compressed air is the source of backwashing air. Under the action, the water can be quickly removed and discharged through the drain; the algae trapped in the filter screen are continuously blown off from the filter screen by air backwashing to form a thick algae slurry, which is collected in the algae collection tank and discharged from the algae discharge pipe .

2. Dehydration of concentrated algal pulp to form semi-solid phase algal mud: concentrated algal pulp enters the slow-rotating elongated drum, which is covered with a filter screen and has a built-in shaftless spiral; when the spiral rotates, the contact surface between the concentrated algal pulp and the filter screen Large, long residence time, which is beneficial to water filtration; at the same time, when the water adhered to the filter meets the high-speed jet of compressed air, part of it will splash back outside the drum to speed up the removal of water, and the air has a drying effect; The algae are continuously blown off by air backwashing, fall into the cylinder, and are slowly transported forward with the rotation of the shaftless screw. discharge.

3. The air backwashing method is adopted, and the air flushing pressure generated can ensure that the filter screen holes are cleaned, so that the washed filter screen has a filtration capacity equivalent to that of the original filter screen, and the filter screen has a continuous and efficient filtration efficiency.

An air backwashing device for continuously concentrating algae pulp, which consists of a primary concentrator, a secondary concentrator, dilute algae pulp, thick algae pulp, an air compressor, an air storage tank, a drum drive motor, a drum drive motor, an air Backwash device drive motor, dilute algae pulp inlet, thick algae pulp outlet, filtered water outlet, backwash air inlet, backwash air pipe, algae collection tank, filter screen, thick algae pulp inlet, algae mud Outlet, guide rail bracket, guide rail, slider, drive link, drum, shaftless screw, water baffle, drum, box, hollow shaft with spoke structure, air valve switch, electric control box, frequency converter, air switch, Touch screen composition. The connection relationship is: the discharge port of the primary concentrator is connected to the feed port of the secondary concentrator through pipelines, the air backwashing system is connected to the inlets of the primary concentrator and the secondary concentrator through air pipes, and the automatic electric The control system is respectively connected to the drum drive motor, drum drive motor, and air backwashing device drive motor of the primary concentrator and the secondary concentrator through cables. Its function is: the primary concentrator changes dilute algae slurry into thick algae slurry, the secondary concentrator changes thick algae slurry into semi-solid phase algae mud, the air backwashing system continuously flushes and blows off the algae trapped on the filter, and automatically The electronic control system modifies and optimizes the parameters of the drum drive motor, drum drive motor, and air backwash device drive motor.

The primary concentrator consists of a drum, drum drive motor, filter screen, algae collection tank, dilute algae pulp inlet, thick algae pulp outlet, hollow shaft with spoke structure, filtered water outlet, backwash inlet, Composition of air backwash pipe and box (Figure 3a, Figure 3b, Figure 3c). The connection relationship is: the drum is installed in the box, connected with the drum drive motor fixed outside the box, the drum is covered with a filter, the algae collection tank is installed directly above the drum, and the dilute algae pulp inlet The outlet of the concentrated algae slurry realizes the entry and exit of the slurry through the pipe passing through the hollow shaft of the spoke structure, the filtered water outlet is installed on the bottom side of the box, the compressed air is sent to the air backwash pipe through the backwash inlet, and the air backwash The flushing pipe is installed above the outer top of the drum. Its role is:

The drum is a steel cylinder with a length of 250-500mm and a diameter of not less than 800mm, and its strength can meet the needs of rapid rotation (rotational speed is not less than 40 rpm); the filter screen is a detachable special stainless steel filter screen with a pore size of 20-60 μm , sealed and fixed on the drum, to filter the dilute algae slurry; the algae collection tank is an algae collection container with a wide top and a narrow bottom, and collects the algae blown off by the air backwashing pipe to form a thick algal pulp; the dilute algae pulp is fed into the The feed port enters the drum, and the concentrated algae pulp is discharged from the discharge port of the concentrated algae pulp. The entry and exit of the pulp is realized through the pipeline passing through the hollow shaft of the spoke structure, and the filtered water is discharged into the working water body from the filtered water outlet; the backwash enters The air port and the backwashing pipe form a fixed air backwashing device, and the compressed air ejected from the air hole of the backwashing pipe flushes the filter screen from the outside to the inside; the box body is a stainless steel cuboid structure, and the upper part is detachable, which is convenient for maintenance and filter screen replacement; The primary concentrator can concentrate the algae pulp by more than 4 to 6 times, and the thick algae pulp produced enters the secondary concentrator.

The secondary concentrator consists of a drum, a drum drive motor, a filter screen, a shaftless screw, a thick algae slurry inlet, a hollow shaft with a spoke structure, an algae mud outlet, a filtered water outlet, a water baffle, a backwash inlet, The air backwash pipe, slider, guide rail, guide rail bracket, drive link, air backwash device drive motor and box are composed (Fig. 4a, Fig. 4b, Fig. 4c). The connection relationship is: the roller is installed in the box, connected with the roller driving motor fixed outside the box, the roller is covered with a filter screen, the shaftless screw is installed in the roller, and the thick algae pulp passes through the spoke structure from the feed port through the pipe. The hollow shaft of the hollow shaft enters the drum, and the algae mud produced by concentration is discharged from the algae mud outlet. The algae mud outlet is set under the tail end of the box, the filtered water outlet is installed in the middle of the bottom of the box, and the water baffle is set at the end of the box. , the compressed air is sent to the air backwash pipe through the backwash air inlet, the backwash air pipe is fixed on the slider, the slider is connected to the guide rail, the guide rail is installed on the guide rail bracket, and the guide rail bracket is fixed on the side of the box. One end of the backwashing air pipe is connected with the driving connecting rod, and the driving connecting rod is connected with the driving motor of the air backwashing device. Its role is:

The drum is a steel drum with a diameter of 250-450mm and a length of 1800-5800mm, which rotates at a slow speed (1-5 rpm) driven by a motor; the shaftless spiral is welded on the inner surface of the drum to act as a reinforcement so that the drum does not deform when rotating , when the shaftless spiral rotates, the concentrated algae pulp is pushed forward to discharge the algae mud; the filter screen is a detachable special stainless steel or nylon filter screen with a pore size of 20-60 μm, which is sealed and fixed on the drum to filter the concentrated algae pulp; The algae slurry enters the front end of the drum through the pipe passing through the hollow shaft of the spoke structure through the inlet of the thick algae slurry, and the algae slurry is directly discharged through the space of the wheel frame of the spoke structure, and is discharged through the algae slurry outlet; the filtered water comes from the The filtered water outlet is discharged into the working water body, and the water baffle separates the filtered water and the algae mud; the backwash air inlet, the air backwash pipe, the slider, the guide rail, the guide rail bracket, the driving connecting rod, and the air backwash device drive motor to form a sliding type Air backwashing device, the compressed air ejected from the pores of the backwashing pipe flushes the filter screen from the outside to the inside, the guide rail and the guide rail bracket play a fixed role, the slider plays a sliding role, and the air backwashing device drives the motor to drive the connecting rod to make the backwashing The air pipe slides back and forth; the box body is a stainless steel cuboid structure, and the upper part is detachable, which is convenient for maintenance and filter replacement. The secondary concentrator concentrates the thick algae slurry by more than 7 to 10 times to form a semi-solid algae mud.

The air backwashing system consists of an air compressor, a self-made air storage tank (diameter not less than 400mm), an air valve switch, a fixed air backwashing device and a sliding air backwashing device (Figure 1). As mentioned above, the fixed air backwashing device is composed of a backwashing air inlet and a backwashing pipe, and the sliding air backwashing device is composed of a backwashing air inlet, an air backwashing pipe, a slider, a guide rail, a guide rail bracket, a drive It is composed of connecting rod and air backwashing device driving motor. The connection relationship is: the air pipe is respectively connected to the air compressor, the air storage tank and the air valve switch, and the air valve switch is respectively connected to the fixed air backwashing device and the sliding air backwashing device; in the fixed air backwashing device, the compressed air passes through The backwash air inlet is connected to the backwash pipe, and the compressed air is sent to the air backwash pipe through the backwash air inlet; in the sliding air backwash device, the compressed air is connected to the backwash pipe through the backwash air inlet, and the compressed air is The backwash air inlet is sent to the air backwash pipe, the backwash air pipe is fixed on the slider, the slider is connected with the guide rail, the guide rail is installed on the guide rail bracket, and the guide rail bracket is fixed on the side of the box. One end of the backwashing air pipe is connected with the driving connecting rod, and the driving connecting rod is connected with the driving motor of the air backwashing device. Its role is:

The compressed air generated by the air compressor is buffered by the air storage tank, and the air volume is controlled by the air valve switch, and then sent to two air backwashing devices; in the fixed air backwashing device, the compressed air ejected from the pores of the air backwashing pipe The filter screen is flushed inside; in the sliding air backwashing device, the compressed air ejected from the pores of the air backwashing pipe flushes the filter screen from the outside to the inside. The flushing device drives the motor to drive the connecting rod, so that the backwash air pipe slides back and forth.

In the air backwashing device, the air flushing pressure generated can ensure that the filter screen holes are cleaned and no dead space is left when the filter screen is flushed, so that the washed filter screen has a filtering capacity equivalent to that of the original filter screen; further, The optimized design of the air backwashing device can save energy consumption.

For the further improvement of the air backwashing device, the air flushing holes can be ① various in shape, such as round holes, square holes, triangular holes, strip holes, etc.; ② hole layout in various forms, such as single row, double row, multiple rows or other styles ; ③ The number and size of holes are appropriate; ④ The distance between the air holes and the filter surface can be optimized.

To further improve the air backwashing device, the sliding backwashing device should A. The sliding direction is perpendicular to the rotation direction of the drum; B. The connected air pipe can slide telescopically; C. The sliding speed can be adjusted and optimized.

The automatic electric control system (PLC control) consists of an electric control box, a frequency converter, an air switch, and a touch screen (Figure 2). The connection relationship is: the frequency converter and air switch are installed in the electric control box, the touch screen is installed outside the electric control box, and the frequency converter, air switch and touch screen are connected by wires. Its function is: the air switch is the circuit control switch, the frequency converter and the touch screen can realize the parameter modification and optimization of the drive motor of the first concentrator, the drive motor of the second concentrator, and the drive motor of the air backwashing device to meet the requirements of automatic control. , Continuous work requirements.

Compared with the prior art, the present invention has the following advantages:

(1) No flocculant is added during the concentration process, and the semi-solid phase algae mud that can be directly bagged is produced, which is convenient for collection, transportation and disposal, and is very beneficial for subsequent resource utilization.

(2) The algal water is completely separated, and the equipment can continuously feed water, separate continuously, and discharge algae residue continuously.

(3) The system has a high degree of automation, the screen surface of the filter screen is automatically cleaned, and it can work continuously day and night.

The invention has been applied to the treatment of algal blooms in Caohai, Dianchi Lake, and is used to dispose of the dilute algae pulp produced by the marine drum microfiltration algae removal machine, and can also directly treat the dilute algae pulp accumulated on the shore, with a concentration of more than 30 times , realizing the continuous production from dilute algae slurry to semi-solid phase algae mud, which is convenient for transportation and subsequent resource utilization.

Description of drawings:

Fig. 1 is a plane layout diagram of a device for concentrating algae pulp.

Fig. 2 is a schematic diagram of an electric control device for concentrating algae pulp.

Fig. 3a is a top view of a primary concentrator and power system.

Figure 3b is a side view of a primary concentrator.

Fig. 3c is a sectional view of the internal structure of a primary concentrator.

Figure 4a is a top view of a secondary concentrator and power system (the upper figure is the external structure, and the lower figure is the internal structure).

Figure 4b is a side view of a secondary concentrator.

Fig. 4c is a sectional view of the internal structure of a secondary concentrator.

Among them: 1. Primary concentrator, 2. Secondary concentrator, 3. Dilute algal pulp, 4. Concentrated algal pulp, 5. Air compressor (B6), 6. Gas storage tank, 7. Drum drive motor ( CHS1500), 8. Drum drive motor (CHS200), 9. Air backwashing device drive motor (CHS400), 10. Thin algae pulp inlet, 11. Thick algae pulp outlet, 12. Filtered water outlet, 13. Backwash air inlet, 14. Backwash air pipe, 15. Algae collection tank, 16. Filter screen, 17. Concentrated algae pulp inlet, 18. Algae mud outlet, 19. Guide rail bracket, 20. Guide rail, 21. Slider Block, 22. Drive connecting rod, 23. Drum, 24. Shaftless screw, 25. Water baffle, 26. Rotary drum, 27. Box body, 28. Spoke structure hollow shaft, 29. Air valve switch (HP25) , 30. Electric control box, 31. Inverter, 32. Air switch, 33. Touch screen.

detailed description

Example 1:

A method for continuously concentrating algae pulp by air backwashing, the steps are:

1. Thin algal pulp is concentrated into thick algal pulp, including:

A. Feed: The dilute algae pulp enters the reed-shaped drum through the feed port. The slurry comes from the dilute algae pulp from the cyanobacteria accumulation area drawn by the water pump, or from the dilute algae pulp harvested by the algae harvesting equipment;

B. Filtration and dehydration: The drum is covered with a filter screen. When the drum rotates rapidly, the water in the algae slurry is filtered through the filter screen under the action of gravity and centrifugal force, and the water adhered to the screen meets the compressed air jetted out at a high speed. , part of it will be splashed outside the drum to speed up the removal of water, and the filtered and removed water will be discharged through the drain;

C. Algae interception: the algae in the algae slurry is intercepted by the filter, attached to the filter, and leaves the water body with the rotation of the drum;

D. Flushing algae: When the algae trapped in the filter rotates to the top with the drum, the air ejected by the air backwashing device installed outside the drum is continuously flushed from the outside to the inside, and the algae are forcibly blown off from the filter;

E. Discharge: The blown-off algae are collected by the algae collection tank set in the cylinder to form a thick algae slurry, which is discharged through the algae discharge pipe.

2. Dehydration of concentrated algal pulp to form semi-solid phase algal mud, including:

A. Feeding: the thick algae pulp enters the long drum through the feeding port;

B. Filtration and dehydration: the drum is covered with a filter screen, and a shaftless screw is built in; when the screw rotates, the contact surface between the thick algal pulp and the filter screen is large, and the residence time is long, which is beneficial to water filtration; at the same time, the water adhered to the filter screen meets Part of the compressed air ejected at high speed will splash back outside the drum to speed up the water removal. At the same time, the air has a drying effect, and the filtered and removed water is discharged through the drain port;

C. Algae interception: the algae in the algae slurry is intercepted by the filter, attached to the filter, and separated from the algae slurry with the rotation of the drum;

D. Flushing algae: the algae trapped in the filter is continuously washed from the outside to the inside by the air ejected from the air backwashing device installed outside the cylinder, and the algae are forced to blow off from the filter;

E. Discharge: The algae that have been blown off fall into the cylinder again, and are slowly transported forward with the rotation of the shaftless screw. Mouth discharge.

3. The air backwash method is adopted, and the compressed air comes from the air compressor; the air flushing pressure generated can ensure that the filter mesh holes are washed clean, so that the washed filter mesh has a filtering capacity equivalent to the original filter mesh.

Example 2:

An air backwashing device for continuously concentrating algae pulp, which consists of a first-stage concentrator 1, a second-stage concentrator 2, a dilute algae pulp 3, a thick algae pulp 4, an air compressor 5, an air storage tank 6, and a drum drive motor 7. Drum driving motor 8, air backwashing device driving motor 9, dilute algae pulp inlet 10, thick algae pulp outlet 11, filtered water outlet 12, backwash air inlet 13, backwash air pipe 14, algae collection Groove 15, filter screen 16, thick algae pulp inlet 17, algae mud outlet 18, guide rail support 19, guide rail 20, slide block 21, drive connecting rod 22, drum 23, shaftless screw 24, water retaining plate 25, turn Tube 26, box body 27, spoke structure hollow shaft 28, gas valve switch 29, electric control box 30, frequency converter 31, air switch 32, touch screen 33 are formed. Its connection relationship is: the discharge port 11 of the primary concentrator 1 is connected with the feed port 17 of the secondary concentrator 2 through a pipeline, and the air backwashing system is connected to the inlet of the primary concentrator 1 and the secondary concentrator 2 through a gas pipe. The air port 13 is connected, and the automatic electronic control system is connected with the drum drive motor 7, the drum drive motor 8, and the air backwashing device drive motor 9 of the primary concentrator 1 and the secondary concentrator 2 respectively through cables. Its function is: the primary concentrator 1 changes the dilute algal pulp 3 into thick algal pulp 4, the secondary concentrator 2 changes the thick algal pulp 4 into semi-solid phase algal mud, and the air backwashing system continuously flushes and blows off the filter screen 16, the automatic electronic control system modifies and optimizes the parameters of the drum drive motor 7, the drum drive motor 8, and the air backwashing device drive motor 9.

(1) The primary concentrator 1 is composed of a drum 26, a drum driving motor 7, a filter screen 16, an algae collection tank 15, a dilute algae pulp inlet 10, a concentrated algae pulp outlet 11, and a spoke-type hollow shaft 28 , filtered water outlet 12, backwash air inlet 13, air backwash pipe 14 and box body 27 (Fig. 3a, Fig. 3b, Fig. 3c).

(2) The secondary concentrator 2 is composed of a drum 23, a drum driving motor 8, a filter screen 16, a shaftless screw 24, a thick algae pulp inlet 17, a hollow shaft with a spoke structure 28, an algae mud outlet 18, and a filtered water outlet 12. Water baffle 25, backwash air inlet 13, air backwash pipe 14, slider 21, guide rail 20, guide rail bracket 19, drive connecting rod 22, air backwash device drive motor 9 and box 27 (Fig. 4a, 4b, 4c).

(3) The air backwashing system consists of an air compressor 5, an air storage tank 6, an air valve switch 29, a fixed air backwashing device and a sliding air backwashing device (Figure 1). Among them, the fixed air backwashing device is composed of backwashing air inlet 13 and backwashing pipe 14, and the sliding air backwashing device is composed of backwashing air inlet 13, air backwashing pipe 14, slider 21, guide rail 20, guide rail Support 19, drive link 22, air backwashing device drive motor 9 form.

(4) The automatic electric control system (PLC control) is composed of an electric control box 30, a frequency converter 31, an air switch 32, and a touch screen 33 (Fig. 2).

The following is a detailed description of the internal structure connections and functions of each part:

A, the connection relationship of the internal structure of the primary concentrator 1 is (Fig. 3a, Fig. 3b, Fig. 3c), the rotating drum 26 is installed in the casing 27, and the rotating drum driving motor 7 is fixedly installed outside the casing 27 and connected with the rotating drum 26 connection, the rotating drum 26 is covered with a filter screen 16, and the algae collection tank 15 is installed directly above the rotating drum 26, and the dilute algae pulp inlet 10 and the concentrated algae pulp outlet 11 pass through the pipeline of the hollow shaft 28 of the spoke structure To realize the entry and exit of the slurry, the filtered water outlet 12 is installed on the bottom side of the box body 27, the backwash air inlet 13 is connected to the air backwash pipe 14, and the compressed air is delivered to the air backwash pipe 14 through the backwash air inlet 13, The air backwashing pipe 14 is installed above the outer top of the rotating drum 26 . Its role is:

Rotary drum 26 is a steel cylinder with a length of 350 mm and a diameter of 1200 mm. Its strength can meet the rotation requirement of 120 rpm, and it is driven by the drum driving motor 7. The filter screen 16 is a detachable special stainless steel filter screen with a pore size of 20 μm. Fixed on the drum 26, filter the dilute algae pulp 3; the algae collection tank 15 is an algae collection container with a wide top and a narrow bottom, and collects the algae blown off by the air backwashing pipe 14 to form a thick algae pulp 4; the dilute algae pulp 3 passes through The dilute algae pulp inlet 10 enters the drum 26, and the thick algae pulp 4 is discharged from the thick algae pulp outlet 11. The entry and exit of the slurry is realized through the pipeline passing through the hollow shaft 28 of the spoke structure, and the filtered water comes from the filtered water The outlet 12 is discharged into the working water body; the backwash air inlet 13 and the air backwash pipe 14 form a fixed air backwash device, and the compressed air ejected from the pores of the backwash pipe 14 flushes the filter screen 16 from the outside to the inside; the box body 27 It is a stainless steel cuboid structure, the upper part is detachable, which is convenient for maintenance and replacement of the filter screen 16; the primary concentrator 1 can concentrate the algae slurry by more than 4 times, and the thick algae slurry 4 produced flows into the secondary concentrator 2 through a feeding pipe with a diameter of 50 mm .

B, the connection relationship of the internal structure of the secondary concentrator 2 is (Fig. 4a, Fig. 4b, Fig. 4c), the drum 23 is installed in the casing 27, and the drum drive motor 8 is fixedly installed outside the casing 27 and connected with the drum 23, The drum 23 is covered with a filter screen 16, the shaftless screw 24 is installed in the drum 23, the feeding port 17 is connected with the hollow shaft 28 of the spoke structure, and the thick algae pulp 4 enters the drum from the feeding port 17 through the hollow shaft 28 of the spoke structure 23. The algae mud produced by concentration is discharged from the algae mud outlet 18, the algae mud outlet 18 is set under the tail end of the box body 27, the filtered water outlet 12 is installed in the bottom middle of the box body 27, and the water baffle 25 is set in the box body 27 tail end, the compressed air is transported to the air backwash pipe 14 through the backwash air inlet 13, the backwash air pipe 14 is fixed on the slider 21, the slider 21 is connected with the guide rail 20, the guide rail 20 is installed on the guide rail bracket 19, and the guide rail The support 19 is fixed on the side of the casing 27 . The backwashing air pipe 14 is connected with the driving connecting rod 22, and the driving connecting rod 22 is connected with the driving motor 9 of the air backwashing device. Its role is:

The drum 23 is a steel drum with a diameter of 330 mm and a length of 2600 mm, driven by a motor 8 at a speed of 2 revolutions per minute; the shaftless screw 24 is welded on the inner surface of the drum for reinforcement so that the drum 23 does not deform when rotating, and the shaftless screw 24 rotates Push the concentrated algae slurry 4 forward to play the role of algae mud discharge; the filter screen 16 is a detachable special stainless steel mesh with a pore size of 20 μm, which is sealed and fixed on the drum 23 to filter the concentrated algae slurry 4; The pulp inlet 17 enters the front end of the drum 23 through the pipeline passing through the hollow shaft 28 of the spoke structure, and the algae mud is directly discharged through the gap of the wheel frame of the spoke structure 28, and is discharged through the algae mud outlet 18; the filtered water is discharged from the The filtered water outlet 12 is discharged into the working water body, and the water baffle 25 separates the filtered water and the algae mud; the backwash air inlet 13, the air backwash pipe 14, the slider 21, the guide rail 20, the guide rail bracket 19, the drive link 22, the air The driving motor 9 of the backwashing device forms a sliding air backwashing device. The compressed air ejected from the pores of the backwashing pipe 14 flushes the filter screen 16 from the outside to the inside. The guide rail 20 and the guide rail bracket 19 play a fixed role, and the slider 21 plays a sliding role , The air backwashing device drive motor 9 drives the connecting rod 22, so that the backwashing air pipe 14 slides back and forth; The secondary concentrator 2 concentrates the thick algae slurry 4 more than 7 times to form a semi-solid phase algae mud.

C. The connection relationship of the internal structure of the air backwashing system is (Figure 1). The air pipes are connected to the air compressor 5, the air storage tank 6 and the air valve switch 29 respectively, and the air valve switch 29 is respectively connected to the fixed air backwashing device and the sliding air backwashing device; the fixed air backwashing device is assembled in the primary concentration In the device 1, the backwash air inlet 13 is connected with the flush pipe 14, and the compressed air is sent to the air backwash pipe 14 through the backwash air inlet 13; the sliding air backwash device is assembled in the secondary concentrator 2, and the backwash Air inlet 13 links to each other with flushing pipe 14, and backwash air pipe 14 is fixed on the slide block 21, and slide block 21 links to each other with guide rail 20, and guide rail 20 is installed on the guide rail support 19, and guide rail support 19 is fixed on the casing 27 sides. The backwashing air pipe 14 is connected with the driving connecting rod 22, and the driving connecting rod 22 is connected with the driving motor 9 of the air backwashing device. Its role is:

The air compressor 5 produces compressed air, which is buffered by a self-made air storage tank 6 with a diameter of 400mm, and the air volume is controlled by the air valve switch 29, and is sent to two air backwashing devices; in the fixed air backwashing device, the air backwashing pipe 14 The compressed air ejected from the pores flushes the filter screen 16 from the outside to the inside; in the sliding air backwashing device, the compressed air ejected from the air holes of the air backwash pipe 14 flushes the filter screen 16 from the outside to the inside, and the guide rail 20 and the guide rail bracket 19 plays a fixed role, slide block 21 plays a sliding role, and the air backwashing device drive motor 9 drives the connecting rod 22 to make the backwashing air pipe 14 slide back and forth.

The above-mentioned air backwashing device, the air flushing pressure generated can ensure that the meshes of the filter screen 16 are rinsed clean and no dead angle is left when the filter screen 16 is flushed, so that the filter screen after flushing has a filtering capacity equivalent to that of the original filter screen; The air flushing holes of the flushing air pipe 14 are round holes, single row, the pore diameter is 0.5mm, the hole pitch is 2mm, and the distance between the pore and the filter screen surface is 20mm.

D, the internal structure connection relationship of the automatic electric control system PLC (control) is (Fig. 2), the frequency converter 31 and the air switch 32 are installed in the electric control box 30, the touch screen 33 is installed on the outside of the electric control box 30, the frequency converter 31, Air switch 32 and touch screen 33 are connected by wires. Its function is: the air switch 32 is a circuit control switch, the frequency converter 31 and the touch screen 33 can realize the parameter modification of the driving motor 7 of the primary concentrator, the driving motor 8 of the secondary concentrator, and the driving motor 9 of the air backwashing device and optimization to meet the requirements of automatic control and continuous work. All the electronic devices are commercially available.

The air backwashing system, the automatic control system, the primary concentrator 1 and the secondary concentrator 2 are assembled and integrated to form an air backwashing device for continuously concentrating algal pulp as shown in FIG. 1 .

Claims (6)

1. A method for continuously concentrating algae pulp by air backwashing, the steps are: 1), dilute algae pulp is concentrated into thick algae pulp, comprising: A. Feed: The dilute algae pulp enters the reed-shaped drum through the feed port. The slurry comes from the dilute algae pulp from the cyanobacteria accumulation area drawn by the water pump, or from the dilute algae pulp harvested by the algae harvesting equipment; B. Filtration and dehydration: The drum is covered with a filter screen. When the drum rotates rapidly, the water in the algae slurry is filtered through the filter screen under the action of gravity and centrifugal force, and the water adhered to the screen meets the compressed air jetted out at a high speed. , part of it will be splashed outside the drum to speed up the removal of water, and the filtered and removed water will be discharged through the drain; C. Algae interception: the algae in the algae slurry is intercepted by the filter, attached to the filter, and leaves the water body with the rotation of the drum; D. Flushing algae: the algae trapped in the filter rotates to the top with the drum, and the air ejected by the air backwashing device installed outside the drum is continuously washed from the outside to the inside, and the algae are blown off from the filter; E. Discharge: the blown-off algae is collected by the algae collection tank set in the cylinder to form a thick algae slurry, which is discharged through the algae discharge pipe; 2) Dehydration of concentrated algae pulp to form semi-solid phase algae mud, including: A. Feeding: the thick algae pulp enters the long drum through the feeding port; B. Filtration and dehydration: the drum is covered with a filter screen, and a shaftless screw is built in; when the screw rotates, the contact between the thick algae slurry and the filter screen stays for a long time, which is good for water filtration; at the same time, the water adhered to the filter screen is sprayed out at a high speed Part of the compressed air will be splashed outside the drum to speed up the water removal, and the filtered and removed water will be discharged through the drain; C. Algae interception: the algae in the algae slurry is intercepted by the filter, attached to the filter, and separated from the algae slurry with the rotation of the drum; D. Flushing algae: the algae trapped in the filter is continuously washed from the outside to the inside by the air ejected from the air backwashing device installed outside the cylinder, and the algae are blown off from the filter; E. Discharge: The algae blown off fall into the cylinder again, and are transported forward with the shaftless spiral rotation, the water in the algae pulp is removed, and finally the semi-solid phase algae mud is formed, which is discharged from the mud discharge port; 3) The air backwashing method is adopted, and the compressed air comes from the air compressor; the generated air flushing pressure causes the filter mesh to be flushed, so that the washed filter mesh is equivalent to the original filter mesh. 2. A device for continuously concentrating algae pulp by air backwashing according to claim 1, which includes a first-stage concentrator (1), a second-stage concentrator (2), an air backwashing system, and an automatic electric control system. That is: the outlet port (11) of the first-stage concentrator (1) is connected to the inlet port (17) of the second-stage concentrator (2) through pipelines, and the air backwashing system is connected to the first-stage The concentrator (1) is connected to the air inlet (13) of the secondary concentrator (2), and the automatic electric control system is respectively connected to the drum drive motor (7) of the primary concentrator (1) and the secondary concentrator through cables. (2) The drum driving motor (8) and the air backwashing device driving motor (9) are connected. 3. An air backwashing device for continuously concentrating algae pulp according to claim 2, characterized in that: the first-stage concentrator (1) consists of a drum (26), a drum driving motor (7), Filter screen (16), algae collection tank (15), dilute algae pulp inlet (10), thick algae pulp outlet (11), hub-and-spoke structure hollow shaft (28), filtered water outlet (12), reverse Flush air inlet (13), air backwash pipe (14) and box body (27), the drum (26) is installed in the box body (27), and the drum drive motor is fixed outside the box body (27) (7), the rotating drum (26) is covered with a filter screen (16), the algae collection tank (15) is installed directly above the rotating drum (26), and the inlet of the dilute algae pulp (10) and the outlet of the thick algae pulp (11) Connect the pipe passing through the hollow shaft (28) of the spoke structure, the filtered water outlet (12) is installed on the bottom side of the box (27), and the backwash air inlet (13) is connected to the air backwash pipe (14) , the air backwashing pipe (14) is installed above the outer top of the rotating drum (26). 4. A device for continuously concentrating algae pulp by air backwashing according to claim 2, characterized in that: the secondary concentrator (2) consists of a drum (23), a drum driving motor (8), a filter screen (16), shaftless screw (24), thick algae slurry inlet (17), hollow shaft with spoke structure (28), algae mud outlet (18), filtered water outlet (12), water retaining plate (25) ), backwash air inlet (13), air backwash pipe (14), slider (21), guide rail (20), guide rail bracket (19), drive link (22), air backwash device drive motor ( 9) Composed of a box (27), the roller (23) is installed inside the box (27), the outside of the box (27) is fixed with a roller drive motor (8), and the roller (23) is covered with a filter screen (16) , the shaftless screw (24) is installed in the drum (23), the thick algae pulp inlet (17) is connected to the pipeline passing through the hollow shaft (28) of the spoke structure, and the algae mud outlet (18) is arranged in the box (27 ), the filtered water outlet (12) is installed at the bottom middle of the box body (27), the water baffle (25) is set at the tail end of the box body (27), the backwash air inlet (13) and the air backwash The flushing pipe (14) is connected, the backwash air pipe (14) is fixed on the slider (21), the slider (21) is connected with the guide rail (20), the guide rail (20) is installed on the guide rail bracket (19), and the guide rail bracket ( 19) Fixed on the inner surface of the box body (27), the backwash air pipe (14) is connected with the driving connecting rod (22), and the driving connecting rod (22) is connected with the driving motor (9) of the air backwashing device. 5. a kind of air backwashing device of continuously concentrating algal pulp according to claim 2, is characterized in that: The air backwashing system is composed of an air compressor (5), an air storage tank (6), an air valve switch (29), a fixed air backwashing device and a sliding air backwashing device, wherein the fixed air backwashing The flushing device consists of a backwashing inlet (13) and a backwashing pipe (14). The sliding air backwashing device consists of a backwashing inlet (13), an air backwashing pipe (14), a slider (21), Guide rail (20), guide rail bracket (19), drive link (22), air backwashing device drive motor (9), and the air pipe is respectively connected to the air compressor (5), air storage tank (6) and air valve switch (29 ), the air valve switch (29) is connected to the fixed air backwashing device and the sliding air backwashing device respectively; the fixed air backwashing device is assembled in the primary concentrator (1), and the compressed air passes through the backwashing inlet (13) is connected to the backwashing pipe (14); the sliding air backwashing device is assembled in the secondary concentrator (2), and the compressed air is connected to the backwashing pipe (14) through the backwashing inlet (13). The flushing air pipe (14) is fixed on the slider (21), the slider (21) is connected with the guide rail (20), the guide rail (20) is installed on the guide rail bracket (19), and the guide rail bracket (19) is fixed on the box body (27 ) on the inner side, the backwashing air pipe (14) is connected with the driving connecting rod (22), and the driving connecting rod (22) is connected with the driving motor (9) of the air backwashing device. 6. A device for continuously concentrating algae pulp by air backwashing according to claim 2, characterized in that: the automatic electric control system consists of an electric control box (30), a frequency converter (31), an air switch (32 ), the touch screen (33), the frequency converter (31) and the air switch (32) are installed in the electric control box (30), the touch screen (33) is installed outside the electric control box (30), the frequency converter (31), air Open (32) and touch screen (33) are connected by electric wire.