CN108101338B - Sludge dewatering device based on the principle of electroosmosis - Google Patents

Abstract

The invention discloses a sludge dewatering device based on an electroosmosis principle, which comprises an insulating sludge tank, a dewatering mechanism and a lifting mechanism; the insulating sludge tank comprises a side wall and a bottom plate, and the lifting mechanism is arranged below the bottom plate; the dewatering mechanism comprises a cathode net control plate arranged on the bottom plate, an anode plate arranged at the upper opening of the insulating sludge tank and a driving device for driving the anode plate to rotate, current is conducted between the anode plate and the cathode net control plate so as to carry out electroosmosis dewatering treatment on sludge, and a scraper which is arranged on one surface of the anode plate and is in contact with the sludge and is in Archimedes spiral arrangement is arranged on one surface of the anode plate, which is used for discharging the sludge. According to the sludge dewatering device, the electric field acting on the electroosmosis effect can keep stable strength by combining the electroosmosis dewatering mode and the mechanical movement mode, so that the problem of increasing the local resistance value of sludge is avoided, and the sludge dewatering efficiency is effectively improved.

Description

Sludge dewatering device based on the principle of electroosmosis

technical field

The invention relates to the technical field of sludge dewatering, in particular to a device for deeply dewatering sludge by adopting the principle of electroosmosis.

Background technique

In recent years, with the rapid development of domestic urban domestic sewage treatment plants, the excess activated sludge produced by sewage treatment plants has increased rapidly and is gradually becoming a public hazard. Due to the large number of active bacteria, this kind of sludge is in a colloidal state, and it is difficult to dehydrate it mechanically. The centrifugal sludge dewatering machine and belt sludge dewatering machine commonly used at present can only dehydrate the sludge to the sludge with a moisture content of about 80%. Due to the high water content of this dewatered sludge, it is not conducive to subsequent treatment such as solidification landfill, biological fermentation or incineration.

At present, the state requires that the dehydration water content of the remaining activated sludge in urban sewage treatment plants be less than 60%. There have been mechanical dehydration technologies based on box filter presses, sludge solidification and landfill technologies, etc., but the operating costs of these technologies are relatively high. High and low efficiency. Some technologies reduce the moisture content by increasing inorganic solid matter, which reduces the content of organic matter, which is not conducive to subsequent resource utilization, especially for the application of bio-fermentation fertilizers, and even pollutes landfill soil.

Electro-osmotic sludge dewatering, as a reliable and stable technology for deep sludge dewatering using electric field, has gradually been concerned and recognized. The principle is to apply a certain DC voltage to the sludge, and use the phenomenon that the sludge particles and water molecules separate and move in the opposite polarity direction for dehydration. It is not necessary to apply high mechanical pressure during dehydration.

An important factor affecting the dewatering efficiency of electroosmotic sludge is the rapid decrease of the moisture content of the sludge near the anode side. The sludge with low moisture content increases the local resistance value, and the electric field acting on the electroosmotic effect decreases rapidly, which directly leads to the overall electroosmotic dehydration. The efficiency drops rapidly and the dehydration time is prolonged. None of the existing electro-osmotic sludge dewatering devices has effectively paid attention to and solved this problem.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a sludge dewatering device based on the principle of electroosmosis. By combining the electroosmosis dewatering method and the mechanical movement method, the electric field acting on the electroosmosis effect can maintain a stable intensity and avoid occurrence of The problem of increasing the local resistance value of sludge can effectively improve the efficiency of sludge dewatering.

The technical scheme that the present invention solves its problem adopts is:

A sludge dewatering device based on the principle of electroosmosis, including an insulating sludge tank for loading sludge, a dehydration mechanism for electroosmotic dehydration of the sludge in the insulating sludge tank, and a dewatering mechanism for lifting the sludge in the insulating sludge tank. The lifting mechanism of the sludge in the tank; the insulating sludge tank includes a side wall and a bottom plate that can be moved up and down along the side wall, and the lifting mechanism is arranged under the bottom plate; An anode plate located at the upper opening of the insulating sludge tank and flush with the upper opening of the insulating sludge tank and a driving device for driving the anode plate to rotate, and a current is conducted between the anode plate and the cathode network control board to control the sewage The mud is subjected to electroosmotic dehydration treatment, and the side of the anode plate in contact with the sludge is provided with a scraper arranged in an Archimedes spiral for discharging the sludge.

Further, the dehydration mechanism also includes a DC power supply for forming a power circuit with the anode plate, the sludge and the cathode network control board, and the positive and negative terminals of the DC power supply are respectively connected to the anode plate and the cathode network control board.

Further, the lifting mechanism includes a lifting screw connected to the bottom of the base plate, a lifting drive wheel for driving the lifting screw to lift and move, and a lifting motor for driving the lifting drive wheel to rotate. The lifting drive wheel is connected to the rotating shaft of the lifting motor, and the lifting drive The wheels mesh with the lifting screw.

Further, a liquid collection chamber for collecting permeate obtained from the sludge is also provided under the bottom plate.

Further, the bottom of the liquid collection chamber is provided with a vacuum suction module for discharging the permeate.

Further, the driving device is a rotary motor.

Further, the cross section of the scraper is triangular.

Further, the anode plate is circular.

Further, the diameter of the anode plate is larger than the diameter of the opening above the insulating sludge tank.

Further, there are several Archimedes spirals formed by scrapers, and the anode plate equally divides the Archimedes spirals formed by scrapers.

The beneficial effects of the present invention are: the sludge dewatering device based on the principle of electroosmosis, the insulating sludge tank can effectively load the sludge containing water, and when the sludge is in the insulating sludge tank, the lifting mechanism will continue to drive the bottom plate to drive the sludge. The mud is lifted along the side wall, so that the sludge on the top layer can be in good contact with the anode plate, and when the sludge is in contact with the anode plate and the cathode grid control plate at the same time, the current will be conducted from the anode plate through the sludge to the anode plate. The cathode grid control plate is used to dehydrate the sludge by electroosmosis; when the sludge on the top layer is dehydrated and dried under the action of the anode plate, the constantly rotating anode plate will use the Archimedes screw on its surface to dehydrate the sludge. The scraper set on the line continuously discharges the dried sludge, and with the continuous discharge of the dried sludge, the lifting mechanism will synchronously lift the sludge in the insulating sludge tank, because it is between the anode plate and the cathode network control plate The sludge is in a wet state, so there will be no increase in the local resistance of the sludge, so that the electric field acting on the electroosmotic effect can maintain a stable strength in the sludge at all times, and the sludge can It is continuously and effectively dehydrated. Therefore, the sludge dewatering device of the present invention, by combining the electroosmotic dehydration method and the mechanical movement method, enables the electric field acting on the electroosmotic effect to maintain a stable strength, avoiding the problem of increasing the local resistance value of the sludge, thereby effectively improving The efficiency of sludge dewatering.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and example.

Fig. 1 is the schematic diagram of sludge dewatering device of the present invention;

Figure 2 is a schematic diagram of the scraper in the anode plate.

Detailed ways

Referring to Fig. 1-Fig. 2, the sludge dewatering device based on the principle of electroosmosis of the present invention includes an insulating sludge tank 1 for loading sludge, and is used for electroosmotic dehydration of the sludge in the insulating sludge tank 1. The dewatering mechanism for treatment and the lifting mechanism for lifting the sludge in the insulating sludge tank 1; the insulating sludge tank 1 includes a side wall and a bottom plate that can be lifted and moved along the side wall, and the lifting mechanism is arranged under the bottom plate; dehydration The mechanism includes the cathode grid control board 2 arranged on the bottom plate, the anode plate 3 arranged at the upper opening of the insulating sludge tank 1 and flush with the upper opening of the insulating sludge tank 1 and used to drive the anode plate 3 to rotate The driving device 4, the current is conducted between the anode plate 3 and the cathode network control plate 2 to perform electroosmotic dehydration treatment on the sludge, and the side of the anode plate 3 that is in contact with the sludge is provided with an archimeter for discharging sludge. The scraper 31 is set in a helical manner. Wherein, the driving device 4 is a rotating electric machine. Specifically, the insulating sludge tank 1 can effectively load water-containing sludge, and when the sludge is in the insulating sludge tank 1, the lifting mechanism will continuously drive the bottom plate to drive the sludge to be lifted along the side wall, so that the sludge in the most The sludge on the top layer can be in good contact with the anode plate 3, and when the sludge is in contact with the anode plate 3 and the cathode grid control panel 2 at the same time, the current will be conducted from the anode plate 3 to the cathode grid control panel 2 through the sludge, thereby The sludge is subjected to electroosmotic dehydration treatment; when the top layer of sludge is dehydrated and dried under the action of the anode plate 3, the continuously rotating anode plate 3 will use the scraper 31 arranged in an Archimedean spiral on its surface Continuously discharge the dried sludge, and with the continuous discharge of the dried sludge, the lifting mechanism will synchronously lift the sludge in the insulating sludge tank 1, because the anode plate 3 and the cathode grid control plate 2 The sludge is in a wet state, so there will be no increase in the local resistance of the sludge, so that the electric field acting on the electroosmotic effect can maintain a stable strength in the sludge at all times, and the sludge can be absorbed Continuous and efficient dehydration. Therefore, the sludge dewatering device of the present invention, by combining the electroosmotic dehydration method and the mechanical movement method, enables the electric field acting on the electroosmotic effect to maintain a stable strength, avoiding the problem of increasing the local resistance value of the sludge, thereby effectively improving The efficiency of sludge dewatering.

Wherein, with reference to Fig. 1, the dehydration mechanism also includes a DC power supply 5 for forming a power circuit with the anode plate 3, sludge and cathode network control panel 2, and the positive terminal and the negative terminal of the DC power supply 5 are respectively connected to the anode plate 3 and the cathode Network control panel 2. Specifically, the DC power supply 5 outputs a stable power supply to the anode plate 3, thereby generating a stable electric field in the sludge, ensuring that the electric field is effectively applied to the sludge whose moisture content has not yet reached the required level. When the anode plate 3 and the cathode network control plate 2 perform electroosmotic dehydration treatment on the sludge, the electric field strength generated between the anode plate 3 and the cathode network control plate 2 is between 3-8V/mm. The DC power supply 5 is a pulsating switch DC adjustable power supply, and the output voltage of the DC power supply 5 is adjusted according to the sludge thickness measured by the electronic scale, so as to ensure that the sludge can be placed in an electric field of appropriate strength.

Wherein, referring to FIG. 1-FIG. 2, the lifting mechanism includes a lifting screw 6 connected to the bottom of the base plate, a lifting driving wheel 7 for driving the lifting screw 6 to move up and down, and a lifting motor 8 for driving the lifting driving wheel 7 to rotate. The lifting driving wheel 7 is connected to the rotating shaft of the lifting motor 8, and the lifting driving wheel 7 and the lifting screw rod 6 are engaged with each other. Specifically, when the sludge dewatering device of the present invention is in operation, the lifting motor 8 can rotate correspondingly with the speed at which the scraper 31 in the anode plate 3 discharges sludge, thereby driving the lifting drive wheel 7 to rotate to drive the lifting screw 6 to rotate, so that the lifting screw 6 can lift the bottom plate with the rotation of the lifting drive wheel 7, so that the sludge on the bottom plate can continuously approach and contact with the anode plate 3 at a suitable speed, thus ensuring sludge It can be dehydrated and discharged stably, preventing the moisture content of the discharged sludge from failing to meet the requirements.

Wherein, referring to FIG. 1 , a liquid collection chamber 9 for collecting the permeate obtained from the sludge is also provided under the bottom plate. Specifically, the liquid collection chamber 9 can effectively receive the liquid extracted from the sludge, so as to effectively separate the sludge from the liquid, and ensure that the extracted liquid will not be soaked in the sludge again, thereby improving the dehydration effect of the sludge and efficiency.

Wherein, referring to FIG. 1 , the bottom of the liquid collection chamber 9 is provided with a vacuum suction module 10 for discharging the permeate. Specifically, when a certain amount of liquid is collected in the liquid collection chamber 9, the vacuum suction module 10 will work to quickly and effectively discharge the liquid in the liquid collection chamber 9 through the suction of the vacuum, so as not to It will affect the effective collection of subsequent liquid.

Wherein, referring to Fig. 1-Fig. 2, the section of the scraper 31 is triangular; the anode plate 3 is circular; Specifically, the diameter of the anode plate 3 is preferably 1 m, made of graphite plates, and the diameter of the anode plate 3 is greater than the diameter of the opening above the insulating sludge tank 1; It is 2.5mm, made of hard insulating ceramics, and fixed on the anode plate 3 by bonding. The anode plate 3 made of graphite plate has good electrical conductivity, so it can generate a stable electric field for the sludge, and the diameter of the anode plate 3 is larger than the diameter of the opening above the insulating sludge tank 1, so when the anode plate 3 rotates and discharges When removing sludge, it can be ensured that the sludge can be effectively discharged, so that there will be no problem that the sludge falls back into the insulating sludge tank 1 . The scraper 31 arranged in an Archimedean spiral can push the sludge to the outside of the insulating sludge tank 1 when the anode plate 3 is rotating, and there will be no phenomenon of sludge clogging and accumulation.

Wherein, referring to FIG. 1-FIG. 2 , there are several Archimedes spirals formed by scrapers 31 , and the anode plate 3 equally divides the Archimedes spirals formed by scrapers 31 . Specifically, the scraper 31 is arranged in an Archimedes spiral, that is, the shape of the scraper 31 is a constant velocity spiral. Since the diameter of the anode plate 3 is preferably 1 m, the polar coordinate equation of the scraper 31 is r=100*(1+ t), where r is the radius value of the scraper 31 at each point, and t is the time for forming the constant velocity spiral. Preferably, there are four Archimedes spirals formed by scrapers 31, and the circular anode plate 3 is equally divided into four scrapers 31 arranged in Archimedes spirals. When the anode plate 3 drives the scrapers 31 to rotate and discharge In the case of sludge, four scrapers 31 arranged in an Archimedes spiral can discharge sludge with an optimal effect, and the effect of preventing sludge from clogging and accumulating is better. When the anode plate 3 rotates, the sludge with low water content near the anode plate 3 can be discharged along the gap between the scrapers 31 under the action of the scraper 31, which not only ensures that the sludge can be discharged efficiently, but also There will be no problem of sludge blocking the Archimedes spiral. Therefore, the sludge dewatering device of the present invention can more than double the efficiency of electroosmotic dehydration, thereby meeting the needs of users for sludge dehydration treatment.

The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation, and those skilled in the art can also make various equivalent deformations or replacements without violating the spirit of the present invention. Equivalent modifications or replacements are all within the scope defined by the claims of the present application.

Claims (8)

1. Sludge dewatering device based on electroosmosis principle, its characterized in that: comprises an insulating sludge tank (1) for loading sludge, a dehydration mechanism for carrying out electroosmotic dehydration treatment on the sludge in the insulating sludge tank (1) and a lifting mechanism for lifting the sludge in the insulating sludge tank (1); the insulating sludge tank (1) comprises a side wall and a bottom plate capable of lifting along the side wall, and the lifting mechanism is arranged below the bottom plate; the dewatering mechanism comprises a cathode net control plate (2) arranged on the bottom plate, an anode plate (3) arranged at the upper opening of the insulating sludge tank (1) and flush with the upper opening of the insulating sludge tank (1) and a driving device (4) for driving the anode plate (3) to rotate, current is conducted between the anode plate (3) and the cathode net control plate (2) so as to carry out electroosmotic dewatering treatment on sludge, and a scraper (31) which is arranged in an Archimedes spiral way and is used for discharging the sludge is arranged on one surface of the anode plate (3) which is contacted with the sludge;

the diameter of the anode plate (3) is larger than that of an opening above the insulating sludge tank (1), a plurality of Archimedes spirals are formed by the scrapers (31), the anode plate (3) equally divides the Archimedes spirals formed by the scrapers (31), and the scrapers (31) are made of hard insulating ceramics.

2. The sludge dewatering device according to claim 1, wherein: the dewatering mechanism further comprises a direct current power supply (5) which is used for forming a power supply loop with the anode plate (3), the sludge and the cathode net control plate (2), and the positive end and the negative end of the direct current power supply (5) are respectively connected with the anode plate (3) and the cathode net control plate (2).

3. The sludge dewatering device according to claim 1, wherein: the lifting mechanism comprises a lifting screw (6) connected below the bottom plate, a lifting driving wheel (7) used for driving the lifting screw (6) to lift and move, and a lifting motor (8) used for driving the lifting driving wheel (7) to rotate, wherein the lifting driving wheel (7) is connected with a rotating shaft of the lifting motor (8), and the lifting driving wheel (7) is meshed with the lifting screw (6).

4. The sludge dewatering device according to claim 1, wherein: a liquid collection chamber (9) for collecting permeate obtained from the sludge is also arranged below the bottom plate.

5. The sludge dewatering device according to claim 4, wherein: the bottom of the liquid collection chamber (9) is provided with a vacuum suction module (10) for discharging permeate.

6. The sludge dewatering device according to claim 1, wherein: the driving device (4) is a rotating motor.

7. The sludge dewatering device according to any one of claims 1 to 6, wherein: the cross section of the scraper (31) is triangular.

8. The sludge dewatering device according to claim 7, wherein: the anode plate (3) is round.

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