Stable vertical flow precipitation device and method

Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a stable vertical flow precipitation device and method.The device comprises a main body provided with a precipitation area, a suspension area, a transition area, a clear water area, a water inlet pipe and a water outlet pipe, a precipitation mechanism comprises magnetic powder and a controller, the magnetic powder is provided with positive charges and located in the suspension area, the multiple electromagnetic poles are arranged close to the suspension area, and the controller is connected with the transition area and the clear water area. According to the vertical-flow sedimentation tank, the problems that the height and density of the suspension area of the existing vertical-flow sedimentation tank are easily influenced by the amount of inlet water, the quality of water and returned sludge, so that a suspension layer is too high or too low, the interception effect of tiny flocs is reduced, the water treatment sedimentation efficiency is reduced, and the sedimentation efficiency is reduced are solved. According to the vertical-flow sedimentation tank, the influence of inflow water quantity, water quality and return sludge on tiny flocs is weakened, and the interception effect of the tiny flocs and the water treatment sedimentation efficiency are greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment, and in particular relates to a stable vertical flow sedimentation device and method. Background Art

[0002] Sedimentation is an important part of the water treatment process. It relies on the sedimentation of suspended solids to effectively remove suspended matter in water and achieve the purpose of solid-liquid separation. Sedimentation tanks can be divided into advection, radial flow and vertical flow sedimentation according to the direction of water flow. Among them, vertical flow sedimentation tanks have the advantages of small footprint and convenient sludge discharge, and are widely used in the field of water treatment. The vertical flow sedimentation column is divided into four areas from bottom to top, namely sludge concentration area, suspension area, transition area and clear water area. The natural sedimentation of flocs in the column is the result of the combined action of buoyancy, gravity and Stocketts resistance. When the natural sedimentation velocity is greater than, equal to or less than the rising velocity of the water flow, the flocs show three movement states: sinking, suspension and rising. The sinking flocs enter the sludge concentration area, and the suspended flocs gradually form a relatively stable suspension area with a certain height, intercept the subsequent rising flocs, and gather into heavier flocs and sink again. Some flocs that cannot be intercepted by the suspension area will rise and enter the transition area. Therefore, the free sedimentation of flocs and the crowded sedimentation of the suspension area synergistically affect the vertical flow sedimentation effect.

[0003] In the existing vertical flow sedimentation tank, the raw water enters the sedimentation tank from the bottom after flocculation. The heavier flocs naturally settle into the concentration zone, and the lighter flocs rise with the water flow and gradually grow into heavier flocs before sinking again, thus forming a relatively stable suspension zone. The height and density of the suspension zone have a huge impact on the turbidity of the precipitated water. Generally speaking, the height of the appropriate suspension zone is 1.2-1.8m, but in actual projects, it is difficult to stabilize the height of the suspension zone due to the influence of the influent water volume, water quality and return sludge. If the suspension layer is too high or too low, the effect of intercepting small flocs will be reduced, causing the tiny flocs to cross the transition zone and enter the clear water zone, increasing the turbidity of the precipitated water, thereby reducing the efficiency of water treatment sedimentation.

[0004] Therefore, the present invention provides a stable vertical flow sedimentation device and method. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the height and density of the suspended area in the existing vertical flow sedimentation tank are easily affected by the influent water volume, water quality and return sludge, resulting in the suspended layer being too high or too low, reducing the interception effect of the micro-flocs, thereby reducing the efficiency of water treatment sedimentation. The present invention achieves that in the vertical flow sedimentation tank, the influence of the influent water volume, water quality and return sludge on the micro-flocs is weakened, and the interception effect of the micro-flocs and the efficiency of water treatment sedimentation are greatly improved.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a stable vertical flow sedimentation device, comprising: The main body includes: Sedimentation zone, used to settle flocs in water; A suspension zone, disposed above the precipitation zone; A transition zone, disposed above the suspension zone; A clear water zone, located above the transition zone; A water inlet pipe connected to the sedimentation area; A water outlet pipe connected to the clean water area; Also included is a precipitation mechanism, the precipitation mechanism comprising: Magnetic powder, with positive charge, is located inside the suspension zone. The magnetic powder is positively charged and adsorbed with negatively charged flocs in the water to form larger flocs, which are then precipitated by gravity and enter the precipitation zone. A plurality of electromagnetic poles are respectively arranged adjacent to the suspension area and are used to magnetically act on the magnetic powder; A controller is electrically connected to the plurality of electromagnetic poles, and is used to control the alternating change of the magnetism of the electromagnetic poles to repel or attract the magnetic powder, so that the magnetic powder rises and falls in the suspension area.

[0007] Preferably, the suspension area is a polyhedral structure, and the plurality of electromagnetic poles are respectively attached to the lower edge slope of the suspension area.

[0008] Preferably, the stable vertical flow sedimentation device further comprises: A mixing flocculation tank, wherein a partition is provided in the mixing flocculation tank, and the bottom of the partition is separated from the bottom of the mixing flocculation tank, and the partition divides the mixing flocculation tank into a first tank area and a second tank area; The first pool area of ​​the mixing flocculation pool is provided with a water inlet, and the second pool area of ​​the mixing flocculation pool is connected with the water inlet pipe through a first pipeline.

[0009] Preferably, a first stirring head and a second stirring head are respectively disposed inside the first pool area and the second pool area.

[0010] Preferably, the bottom of the sedimentation area is connected to the second pipe through a sludge discharge pipe, one end of the second pipe is connected to the bottom of the mixing flocculation tank, the other end of the second pipe is used to discharge sludge, a first pump is provided on the second pipe between the sludge discharge pipe and the mixing flocculation tank, and a second pump is provided on the end of the second pipe away from the mixing flocculation tank.

[0011] A stable vertical flow sedimentation method comprises the following steps: S1: Add flocculants and coagulants into the mixed flocculation tank, start the first stirring head and the second stirring head to rotate and stir respectively, and flocculate the water flow inside the first pool area and the second pool area; S2: The flocculated water flows into the sedimentation area through the first pipe on the second pool area, and the modified positively charged magnetic powder is added to the suspension area. The magnetic powder adsorbs the negatively charged flocs in the water. When the adsorbed flocs grow to a certain extent, they will fall off and sink with the magnetic powder and enter the sedimentation area. S3: When the magnetic powder falls to the sedimentation area by its own gravity, the controller is turned on to energize the electromagnetic pole, which generates the same magnetism as the magnetic powder and repels the magnetic powder. The magnetic powder moves upward due to the lifting force. S4: When the magnetic powder rises and is about to reach the transition zone, the controller controls the magnetic pole to change its magnetic properties, and the magnetic powder sinks under the combined action of adsorption force and gravity; S5: Repeat the above steps S2 to S4 in a loop to adsorb the tiny flocs in the water.

[0012] Beneficial effects of the present invention: 1. The present invention provides a sedimentation mechanism in the suspension zone to precipitate the micro-flocs in the suspension zone, thereby reducing the influence of the influent water volume, water quality and return sludge on the micro-flocs, stabilizing the size and position of the suspension layer, and greatly improving the interception effect of the micro-flocs and the efficiency of water treatment sedimentation.

[0013] 2. The present invention cooperates with the magnetic powder and the electromagnetic pole inside the sedimentation mechanism so that the magnetic powder can be precipitated by its own gravity and magnetic adsorption force after adsorbing tiny flocs in the water, and the magnetic repulsion force causes the magnetic powder that has not adsorbed the flocs to rise, thereby performing adsorption cycle sedimentation again, greatly improving the efficiency of water treatment sedimentation.

[0014] 3. The present invention introduces modified positively charged magnetic powder into the suspension zone, so that the positively charged magnetic powder adsorbs negatively charged flocs in the water, thereby adsorbing and precipitating more tiny flocs, greatly improving the interception effect of tiny flocs and the efficiency of water treatment precipitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the high-density sedimentation tank of the present invention.

[0016] Figure 2 It is a schematic diagram of the stable vertical flow sedimentation structure of the present invention.

[0017] Figure 3 It is a schematic diagram of the force movement of magnetic powder in the suspension area of ​​the present invention.

[0018] In the figure: 1. sedimentation zone; 2. suspension zone; 3. transition zone; 4. clear water zone; 5. water inlet pipe; 6. water outlet pipe; 7. sedimentation mechanism; 71. electromagnetic pole; 72. magnetic powder; 73. controller; 8. mixing flocculation tank; 81. partition; 82. first tank area; 821. first stirring head; 83. second tank area; 831. second stirring head; 84. water inlet; 85. first pipeline; 9. mud discharge pipe; 91. second pipeline; 911. first pump; 912. second pump. DETAILED DESCRIPTION

[0019] The method for using the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0020] like Figures 1 to 3 As shown, a stable vertical flow sedimentation device comprises: The main body includes: Sedimentation zone 1, used to precipitate flocs in water; A suspension zone 2 is arranged above the precipitation zone 1; A transition zone 3 is provided above the suspension zone 2; A clear water zone 4 is provided above the transition zone 3; A water inlet pipe 5 connected to the sedimentation area 1; A water outlet pipe 6 connected to the clean water area 4; It also includes a precipitation mechanism 7, and the precipitation mechanism 7 includes: The magnetic powder 72 has a positive charge and is located inside the suspension zone 2. The magnetic powder 72 is positively charged and adsorbs and combines with the negatively charged flocs in the water to form larger flocs, and settles them by gravity, thereby entering the sedimentation zone 1. It should be noted that since the magnetic powder 72 is modified magnetic powder 72, the magnetic powder 72 carries a positive charge and is put into the suspension area 2, thereby adsorbing and combining with the negatively charged tiny flocs inside, and slowly forming larger flocs. As the weight increases, some of the flocs adsorbed by the magnetic powder 72 are too large, causing part of the magnetic powder 72 to fall down, and the flocs will settle downward.

[0021] Moreover, during the sedimentation process, the degree to which the magnetic powder 72 adsorbs the flocs is different. Some magnetic powder 72 still carries a certain positive charge, and this part will rise again. Some magnetic powder 72 has been completely neutralized and will fall off. This process requires maintaining the total amount of moving magnetic powder 72 and adding new magnetic powder 72 according to the situation.

[0022] A plurality of electromagnetic poles 71 are respectively disposed adjacent to the suspension area 2 and are used to magnetically act on the magnetic powder 72; The controller 73 is electrically connected to the plurality of electromagnetic poles 71, and is used to control the alternating change of the magnetism of the electromagnetic poles 71, and repel or attract the magnetic powder 72, so that the magnetic powder 72 rises and falls in the suspension area 2. The controller 73 is used to control the change of the magnetism of the electromagnetic poles 71, and thus change the rise and fall of the magnetic powder 72.

[0023] The suspension area 2 is a polyhedral structure, and the plurality of electromagnetic poles 71 are respectively attached to the lower inclined surface of the suspension area 2 .

[0024] The stable vertical flow sedimentation device also includes: A mixing and flocculation tank 8, wherein a partition 81 is provided in the mixing and flocculation tank 8, and the bottom of the partition 81 is separated from the bottom of the mixing and flocculation tank 8, and the partition 81 divides the mixing and flocculation tank 8 into a first tank area 82 and a second tank area 83; The first pool area 82 of the mixing and flocculation pool 8 is provided with a water inlet 84 , and the second pool area 83 of the mixing and flocculation pool 8 is connected to the water inlet pipe 5 through a first pipeline 85 .

[0025] A first stirring head 821 and a second stirring head 831 are respectively disposed inside the first pool area 82 and the second pool area 83. The first stirring head 821 and the second stirring head 831 are used to accelerate the rapid flocculation of the mixing flocculation pool 8.

[0026] The bottom of the sedimentation area 1 is connected to the second pipe 91 through the mud discharge pipe 9, one end of the second pipe 91 is connected to the bottom of the mixing and flocculation tank 8, and the other end of the second pipe 91 is used to discharge sludge. A first pump 911 is provided on the second pipe 91 between the mud discharge pipe 9 and the mixing and flocculation tank 8, and a second pump 912 is provided on the end of the second pipe 91 away from the mixing and flocculation tank 8.

[0027] Return sludge can help flocculation and sedimentation, increase the concentration of sludge in the reaction tank, ensure that the sludge maintains its integrity, and maintain a relatively stable solid load in the sedimentation tank regardless of the raw water concentration and flow rate.

[0028] In addition, the sludge return contacts and adsorbs the particles in the influent, which accelerates the flocculation of the particles, promotes the rapid separation of the impurity particles, accelerates the sedimentation process, and achieves efficient solid-liquid separation.

[0029] A stable vertical flow sedimentation method comprises the following steps: S1: Add flocculants and coagulants into the mixed flocculation tank 8, start the first stirring head 821 and the second stirring head 831 to rotate and stir respectively, and flocculate the water flow inside the first pool area 82 and the second pool area 83; S2: The flocculated water flows into the sedimentation zone 1 through the first pipe 85 on the second pool zone 83, and the modified positively charged magnetic powder 72 is added to the suspension zone 2. The magnetic powder 72 adsorbs the negatively charged flocs in the water. When the adsorbed flocs grow to a certain extent, they will fall off and sink with the magnetic powder 72 and enter the sedimentation zone 1. S3: When the magnetic powder 72 falls to the sedimentation area 1 by its own gravity, the controller 73 is turned on to energize the electromagnetic pole 71. The electromagnetic pole 71 generates the same magnetism as the magnetic powder 72 and repels the magnetic powder 72. The magnetic powder 72 moves upward due to the lifting force. S4: When the magnetic powder 72 rises and is about to reach the transition zone 3, the controller 73 controls the magnetic field of the electromagnetic pole 71 to change, and the magnetic powder 72 sinks under the combined action of the adsorption force and gravity; S5: Repeat the above steps S2 to S4 in a loop to adsorb the tiny flocs in the water.

[0030] Working process: First, it is necessary to add flocculants and coagulants to the mixed flocculation tank 8, and then start the first stirring head 821 and the second stirring head 831 to rotate and stir respectively, so as to flocculate the water flow inside the first pool area 82 and the second pool area 83; the flocculated water flow flows into the sedimentation area 1 through the first pipe 85 on the second pool area 83, and the modified positively charged magnetic powder 72 is added to the sedimentation area 1; After the magnetic powder 72 falls to the sedimentation area 1 by its own gravity, the controller 73 is turned on to energize the electromagnetic pole 71. The electromagnetic pole 71 generates the same magnetism as the magnetic powder 72 and repels the magnetic powder 72. The magnetic powder 72 moves upward due to the lifting force, and at the same time, adsorbs the negatively charged flocs in the water. When the adsorbed flocs grow to a certain extent, they will fall off and sink with the magnetic powder 72 due to the increase in gravity and enter the sedimentation area 1; when the magnetic powder 72 rises and is about to reach the transition area 3, the controller 73 controls the magnetic change of the electromagnetic pole 71 and adsorbs the magnetic powder 72. The magnetic powder 72 sinks under the combined action of the adsorption force and gravity; when the magnetic powder 72 sinks and is about to reach the sedimentation area 1, the controller 73 controls the magnetic change of the electromagnetic pole 71 and repels the magnetic powder 72. The magnetic powder 72 moves upward again under the repulsive action of the magnetic force and adsorbs the flocs; The precipitated sludge is then discharged through the drain pipe at the bottom of the sedimentation area 1, and is driven back into the mixing flocculation tank 8 by the first pump 911 on the second pipe 91, where it contacts and adsorbs the particles in the water inlet 84, accelerating particle flocculation, promoting the rapid separation of impurity particles, accelerating the sedimentation process, and achieving efficient solid-liquid separation. The remaining sludge is driven by the second pump 912 and discharged from the other end of the second pipe 91.

[0031] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stable vertical flow sedimentation device, comprising: The main body includes: A sedimentation zone (1) for settling flocs in water; A suspension zone (2) is arranged above the sedimentation zone (1); A transition zone (3) is arranged above the suspension zone (2); A clear water zone (4) is arranged above the transition zone (3); A water inlet pipe (5) connected to the sedimentation area (1); A water outlet pipe (6) connected to the clean water area (4); The invention is characterized in that it further comprises a sedimentation mechanism (7), wherein the sedimentation mechanism (7) comprises: Magnetic powder (72) with positive charge is located inside the suspension zone (2). The magnetic powder (72) is positively charged and adsorbs and combines with negatively charged flocs in the water to form larger flocs, which are then precipitated by gravity and enter the precipitation zone (1). A plurality of electromagnetic poles (71), respectively disposed adjacent to the suspension area (2) and used for magnetically acting on the magnetic powder (72); A controller (73) is electrically connected to the plurality of electromagnetic poles (71), and the controller (73) is used to control the alternating change of the magnetism of the electromagnetic poles (71) to repel or attract the magnetic powder (72), so that the magnetic powder (72) rises and falls in the suspension area (2).

2. A stable vertical flow sedimentation device according to claim 1, characterized in that: The suspension area (2) is a polyhedral structure, and the plurality of electromagnetic poles (71) are respectively attached to the lower inclined surface of the suspension area (2).

3. A stable vertical flow sedimentation device according to claim 1, characterized in that: The stable vertical flow sedimentation device also includes: A mixing flocculation tank (8), wherein a partition (81) is provided in the mixing flocculation tank (8), and the bottom of the partition (81) is separated from the bottom of the mixing flocculation tank (8), and the partition (81) divides the mixing flocculation tank (8) into a first tank area (82) and a second tank area (83); The first pool area (82) of the mixing and flocculation pool (8) is provided with a water inlet (84), and the second pool area (83) of the mixing and flocculation pool (8) is connected to the water inlet pipe (5) via a first pipe (85).

4. A stable vertical flow sedimentation device according to claim 3, characterized in that: A first stirring head (821) and a second stirring head (831) are respectively provided inside the first pool area (82) and the second pool area (83).

5. A stable vertical flow sedimentation device according to claim 3, characterized in that: The bottom of the sedimentation zone (1) is connected to a second pipe (91) via a sludge discharge pipe (9); one end of the second pipe (91) is connected to the bottom of the mixing and flocculation tank (8); the other end of the second pipe (91) is used to discharge sludge; a first pump (911) is provided on the second pipe (91) between the sludge discharge pipe (9) and the mixing and flocculation tank (8); and a second pump (912) is provided on one end of the second pipe (91) away from the mixing and flocculation tank (8).

6. A stable vertical flow sedimentation method, the method adopts a stable vertical flow sedimentation device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Adding flocculants and coagulants into the mixed flocculation tank (8), starting the first stirring head (821) and the second stirring head (831) to rotate and stir respectively, and flocculating the water flow inside the first tank area (82) and the second tank area (83); S2: The flocculated water flows into the sedimentation zone (1) through the first pipe (85) on the second pool zone (83), and the modified positively charged magnetic powder (72) is added to the suspension zone (2). The magnetic powder (72) adsorbs the negatively charged flocs in the water. When the adsorbed flocs grow to a certain extent, they fall off and sink with the magnetic powder (72) and enter the sedimentation zone (1); S3: When the magnetic powder (72) descends to the sedimentation area (1) by its own gravity, the controller (73) is turned on to energize the electromagnetic pole (71). The electromagnetic pole (71) generates the same magnetism as the magnetic powder (72) and repels the magnetic powder (72). The magnetic powder (72) is lifted and moves upward; S4: When the magnetic powder (72) rises and is about to reach the transition zone (3), the controller (73) controls the magnetic field of the electromagnetic pole (71) to change, and the magnetic powder (72) sinks under the combined action of the adsorption force and gravity; S5: Repeat the above steps S2 to S4 in a loop to adsorb the tiny flocs in the water.

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