A step-by-step flocculation and precipitation device for pulp mill wastewater treatment

Abstract

The application discloses a kind of step-by-step flocculation and precipitation devices for pulp mill wastewater treatment, and specifically relates to the technical field of papermaking wastewater treatment.The application comprises a sedimentation tank one and a sedimentation tank two, and a support frame is installed on the rear sidewall of both.The top wall of the support frame is vertically fixed with a gas cylinder, and a dosing mechanism for feeding flocculants is arranged below the gas cylinder.The application controls the contraction of the gas cylinder to synchronize the opening of the output parts of the solid tank and the liquid tank, which not only completes the feeding of liquid flocculants to preliminarily flocculate the wastewater, but also synchronously completes the advance dissolution of solid flocculants to improve the efficiency of wastewater flocculation and precipitation.Meanwhile, the cleaning of the filter screen of the submersible pump is completed synchronously during the conveying of wastewater to ensure the continuous conveying of wastewater and further improve the efficiency of wastewater flocculation and precipitation.

Description

Technical Field

[0001] This invention relates to the field of papermaking wastewater treatment technology, and more specifically, to a stepwise flocculation and sedimentation device for pulping wastewater treatment. Background Technology

[0002] The papermaking industry is divided into two main process stages: pulping and papermaking. Pulping is the process of separating the fibers from plant raw materials and making pulp, which is then bleached. This process consumes a lot of water resources and generates a certain amount of wastewater. In order to make the wastewater generated during the operation as reused as possible, paper mills need to treat the wastewater to reduce COD, suspended solids and heavy metal ions.

[0003] According to the patent document with publication number CN208200477U, the device treats papermaking wastewater through a treatment system, which can reduce the COD, suspended solids and heavy metal ions in the wastewater, and reduce the pollution of the environment caused by the discharge of wastewater. However, in the above patent document, flocculant needs to be added twice when flocculating the wastewater, and the second flocculant (polyacrylamide) is a solid particle that needs to be dissolved in advance before use to ensure that it is fully dissolved in the water. The dissolution of a large amount of flocculant takes a certain amount of time, which reduces the efficiency of wastewater flocculation. It is impossible to complete the pre-dissolution treatment of the second flocculant at the same time as the first flocculant is added, so as to improve the efficiency of wastewater flocculation and sedimentation.

[0004] Meanwhile, in order to achieve gradual flocculation of pulping wastewater, multiple flocculation tanks are required. During the transfer of wastewater, the sediment inside the initial flocculation tank is prone to clogging the filter screen at the input end of the submersible pump, affecting the wastewater transport process. It is difficult to clean the submersible pump filter screen at the same time while transporting wastewater to ensure continuous wastewater transport.

[0005] To address the aforementioned technical shortcomings, a solution is provided. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a stepwise flocculation and sedimentation device for pulping wastewater treatment, so as to solve the technical defects mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a stepwise flocculation and sedimentation device for pulping wastewater treatment, comprising a sedimentation tank 1 and a sedimentation tank 2, and a support frame jointly installed on the rear side wall of both. A cylinder is vertically fixedly inserted into the top wall of the support frame, and a dosing mechanism for feeding flocculant is provided below the cylinder. The dosing mechanism includes an adjusting plate rotatably connected to the front side wall of the support frame.

[0008] The sedimentation tank is equipped with a conveying mechanism for transporting pre-flocculated wastewater. The conveying mechanism includes a water pump installed inside the sedimentation tank. A filter screen is installed at the input end of the water pump, and a conveying pipe is installed at the output end of the water pump. An L-plate is fixedly installed on the inner side wall of the sedimentation tank. An air bladder is installed on the front side of the L-plate, and an auxiliary component for cleaning the filter screen is installed below the air bladder.

[0009] An impact assembly is provided above the airbag, and the impact assembly includes a dissolving tank connected to the output end of the solid particle conveying pipe.

[0010] Furthermore, a second sliding groove is provided on one side of the adjusting plate, a second lever is fixedly provided above the extended end of the cylinder, and the second lever is movably connected to the second sliding groove. A first support plate and a second support plate are fixedly connected to the front side wall of the support frame.

[0011] Furthermore, a solid box is inserted into the outer wall of the second support plate, and the bottom end of the cylinder protrusion extends into the solid box and is fixedly connected to a second blocking cone, which is located inside the particle conveying pipe of the solid box.

[0012] Furthermore, a liquid tank is inserted into the outer wall of the support plate, and a feeding rod is movably inserted into the liquid tank. The top of the feeding rod extends outside the liquid tank, and a lever is connected to the top wall of the feeding rod. A sliding groove is opened on the other side of the adjustment plate, and the lever is movably connected to the sliding groove.

[0013] Furthermore, a blocking cone is fixedly connected to the bottom end of the feeding rod, and the blocking cone is located outside the infusion tube of the liquid tank.

[0014] Furthermore, the delivery pipe is connected to the airbag through a connecting pipe, and a one-way valve is provided on the outer wall of the connecting pipe. An L rod is rotatably connected to the front side wall of the L plate through a rotating shaft, and a sliding groove is provided on the bottom side wall of the L rod.

[0015] Furthermore, the auxiliary components include a limiting plate and a limiting block connected to one side wall of the sedimentation tank. The limiting plate is slidably connected to an adjusting rod, and a lever three is fixedly connected to the top of the adjusting rod. The lever three is movably connected to a sliding groove three, and a baffle is also installed on the outer wall of the adjusting rod.

[0016] Furthermore, a tension spring is sleeved on the outer wall of the baffle and the limiting plate of the adjusting rod, and a soft brush is provided on the bottom side wall of the adjusting rod.

[0017] Furthermore, the output end of the airbag is connected to the dissolving tank via an impact tube. A control valve is provided on the outer wall of the impact tube. The output end of the dissolving tank is connected to a discharge pipe, and the output end of the discharge pipe is oriented towards the sedimentation tank. A one-way valve is provided on the outer wall of the discharge pipe.

[0018] The technical effects and advantages of this invention are as follows:

[0019] 1. This invention involves a cylinder retracting to pull the second lever upwards, causing the first lever to move downwards within the chute, pushing the feeding rod and causing the first blocking cone to move downwards. The flocculant liquid inside the liquid tank enters the sedimentation tank along the first blocking cone. Combined with the stirring device at the bottom of the sedimentation tank, the flocculant liquid is fully mixed with the pulping wastewater, achieving initial flocculation and sedimentation of the pulping wastewater. Simultaneously, the second blocking cone moves into the solid tank, allowing the flocculant particles inside the solid tank to enter the dissolving tank and prematurely mix with the purified water inside the dissolving tank, shortening the later dissolving process and improving the efficiency of wastewater flocculation and sedimentation.

[0020] 2. This invention controls the operation of a water pump to quickly inflate an air bladder to a set size. The inflated air bladder presses down on the L-shaped lever, causing the adjusting lever to push down the soft brush, cleaning the filter screen at the water pump inlet. This prevents the water pump inlet from being clogged by sedimented impurities, which would affect liquid delivery. Then, all the liquid inside sedimentation tank one is transported to sedimentation tank two. Subsequently, air bladder two is quickly contracted, flushing the liquid inside into the dissolving tank through the impact pipe, and then into sedimentation tank two through the discharge pipe. In conjunction with the stirring device inside sedimentation tank two, the wastewater undergoes further flocculation and sedimentation. By gradually flocculating and sedimenting the pulping wastewater, and using a mixture of various flocculants, different flocculants work synergistically to promote the destabilization of colloidal particles and the formation of flocs, thereby improving the flocculation effect of the pulping wastewater. Attached Figure Description

[0021] Figure 1 This is an overall structural appearance diagram of the present invention.

[0022] Figure 2 This is a perspective view of the dosing mechanism in this invention.

[0023] Figure 3 This is a front view of the overall structure of the present invention.

[0024] Figure 4 This is a front view of the internal structure of sedimentation tank one in this invention.

[0025] Figure 5 This is a front view of the conveying mechanism in this invention.

[0026] Figure 6 This is a front view of the impact component in this invention.

[0027] Figure 7 This is a front view of the auxiliary component in this invention.

[0028] Figure 8 This is a perspective view of the adjusting rod in this invention.

[0029] The attached diagram is labeled as follows: 1. Sedimentation tank one; 2. Support frame; 3. Sedimentation tank two; 4. Cylinder; 5. Dosing mechanism; 51. Feeding rod; 52. Blocking cone one; 54. Blocking cone two; 55. Adjusting plate; 56. Slide 1; 57. Slide 2; 58. Solid tank; 59. Liquid tank; 510. Feeding pipe one; 511. Support plate one; 512. Feeding pipe two; 513. Support plate two; 6. Auxiliary mechanism; 61. Water pump; 62. Conveying... 63. Feed pipe; 64. Control valve one; 65. L-plate; 66. Check valve one; 67. L-rod; 681. Airbag; 682. Impact pipe; 683. Control valve two; 684. Dissolving tank; 685. Check valve two; 686. Discharge pipe; 691. Lever three; 692. Adjusting rod; 693. Limit plate; 694. Limit block; 695. Baffle; 696. Filter screen; 697. Soft brush; 610. Slide groove three; 611. Connecting pipe. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: As Figure 1-8 As shown, the stepwise flocculation and sedimentation device for pulping wastewater treatment proposed in this embodiment includes a sedimentation tank 1 and a sedimentation tank 2, as well as a support frame 2 installed on the rear side wall of both. A cylinder 4 is vertically fixedly inserted into the top wall of the support frame 2.

[0032] It should be noted that both sedimentation tank 1 and sedimentation tank 2 are equipped with a mixing device for mixing flocculant and wastewater. The mixing device usually consists of a drive motor, a mixing shaft and mixing blades. That is, the output end of the drive motor is connected to the mixing shaft, and multiple mixing blades are provided on the outer wall of the mixing shaft. This is existing technology and will not be explained in detail here.

[0033] Below the cylinder 4 is a feeding mechanism 5 for feeding flocculant. The feeding mechanism 5 includes an adjusting plate 55 that is rotatably connected to the front side wall of the support frame 2. A second sliding groove 57 is provided on one side of the adjusting plate 55. A second lever is fixedly provided above the extended end of the cylinder 4, and the second lever is movably connected to the second sliding groove 57. A first support plate 511 and a second support plate 513 are fixedly connected to the front side wall of the support frame 2. A solid box 58 is vertically fixedly inserted into the outer wall of the second support plate 513. The bottom end of the extended end of the cylinder 4 extends into the solid box 58 and is fixedly connected to a second blocking cone 54. The second blocking cone 54 is located in the particle conveying pipe of the solid box 58.

[0034] It should be noted that the particle delivery tube and the liquid delivery tube are fixedly connected to the output end of the solid tank 58 and the output end of the liquid tank 59, respectively; the purpose of the plug 54 located inside the particle delivery tube of the solid tank 58 is to block the solid flocculant inside the solid tank 58.

[0035] A liquid tank 59 is vertically fixedly inserted into the outer wall of the support plate 511. A feeding rod 51 is vertically movably inserted into the inside of the liquid tank 59. The top of the feeding rod 51 extends to the outside of the liquid tank 59, and a lever is fixedly connected to the top wall of the feeding rod 51. A sliding groove 56 is opened on the other side of the adjusting plate 55. The lever is movably connected to the sliding groove 56. A blocking cone 52 is fixedly connected to the bottom end of the feeding rod 51. The blocking cone 52 is located outside the infusion tube of the liquid tank 59.

[0036] It should be noted that the plug cone 52 is located outside the infusion tube of the liquid tank 59, and the top side wall of the plug cone 52 is in contact with the infusion tube of the liquid tank 59, thus sealing the infusion tube of the liquid tank 59.

[0037] A feed pipe 510 is inserted into the top side wall of the liquid tank 59, and a feed pipe 512 is inserted into the top side wall of the solid tank 58. Both feed pipes 510 and 512 are pipes for replenishing flocculants. The liquid tank 59 contains liquid flocculants, and the solid tank 58 contains solid flocculants. The use of multiple flocculants in combination allows different flocculants to have a synergistic effect, which jointly promotes the destabilization of colloidal particles and the formation of flocs. This synergistic effect can make up for the shortcomings of using a single flocculant and improve the flocculation effect of pulping wastewater.

[0038] In this embodiment, cylinder 4 retracts and pulls lever 2 upwards, causing blockage cone 2 54 to move into solid tank 58, allowing the flocculant particles inside solid tank 58 to enter dissolving tank 683 and mix with the purified water inside dissolving tank 683 in advance, shortening the later dissolving process and improving the wastewater purification effect; at the same time, lever 1 moves downwards in slide 1 56 to push blockage cone 1 52, and the flocculant liquid inside liquid tank 59 enters the interior of sedimentation tank 1 along blockage cone 1 52.

[0039] Example 2: Figure 1-8 As shown, the stepwise flocculation and sedimentation device for pulping wastewater treatment proposed in this embodiment is an improvement on the basis of embodiment 1. The sedimentation tank 1 is equipped with a conveying mechanism 6 for conveying the preliminary flocculated wastewater. The conveying mechanism 6 includes a water pump 61 installed inside the sedimentation tank 1. The water pump 61 has a waterproof function and is commonly a submersible pump, which is existing technology and will not be described in detail here. It is sufficient to say that it has the function of conveying wastewater.

[0040] like Figure 1-5As shown, a filter screen 696 is provided at the input end of the water pump 61, and a delivery pipe 62 is provided at the output end of the water pump 61. The output end of the delivery pipe 62 extends to the top of the sedimentation tank 2 3. An L plate 64 is fixedly provided on the inner side wall of the sedimentation tank 1. An air bag 67 is installed on the front side of the L plate 64. The delivery pipe 62 is connected to the air bag 67 through a connecting pipe 611. A one-way valve 65 is provided on the outer wall of the connecting pipe 611. An L rod 66 is rotatably connected to the front side wall of the L plate 64 through a rotating shaft. The top of the L rod 66 is in contact with the air bag 67. A sliding groove 610 is provided on the bottom side wall of the L rod 66.

[0041] like Figure 4-5 As shown in Figures 7-8, an auxiliary component for cleaning the filter screen 696 at the input end of the water pump 61 is provided below the L-rod 66. The auxiliary component includes a limiting plate 693 and a limiting block 694 fixedly connected to the side wall of the sedimentation tank 1. The limiting plate 693 is located above the limiting block 694. The limiting plate 693 is slidably connected to a vertically arranged adjusting rod 692. A lever 691 is fixedly connected to the top of the adjusting rod 692. The lever 691 is movably connected to the slide groove 610. A baffle 695 is fixedly installed on the outer wall of the lower part of the adjusting rod 692. A tension spring is sleeved on the outer wall of the adjusting rod 692. The tension spring is located between the baffle 695 and the limiting plate 693. A soft brush 697 is fixedly installed on the side wall of the adjusting rod 692 away from the limiting block 694.

[0042] It should be noted that the water pump 61 first transports the liquid after preliminary flocculation in the sedimentation tank 1 to the inside of the air bag 67 through the connecting pipe, so that the air bag 67 is quickly inflated to the set size. The inflated air bag 67 presses down on the L rod 66, so that the adjusting rod 692 pushes down the soft brush 697 to complete the cleaning of the filter screen 696 at the input end of the water pump 61.

[0043] After the wastewater has completed flocculation and sedimentation, the tension spring causes the adjusting rod 692 to quickly return to its original position, allowing the filter screen 696 to be cleaned again.

[0044] like Figure 1-4 As shown, an impact assembly is provided above the airbag 67. The impact assembly includes a dissolving tank 683 connected to the output end of the particle conveying pipe of the solid box 58. The output end of the airbag 67 is connected to the dissolving tank 683 through an impact pipe 681. A control valve 682 is provided on the outer wall of the impact pipe 681. The output end of the dissolving tank 683 is connected to a discharge pipe 685, and the output end of the discharge pipe 685 is oriented towards the sedimentation tank 3. A one-way valve 684 is provided on the outer wall of the discharge pipe 685.

[0045] It should be noted that the dissolving tank 683 is pre-filled with purified water for dissolving the flocculant, and since no pressure is added inside the dissolving tank 683, it will not flow out through the one-way valve 684.

[0046] When control valve 682 is opened, airbag 67 contracts rapidly, flushing the liquid inside into dissolving tank 683 through impact pipe 681, and then into sedimentation tank 3 through discharge pipe 685. Together with the stirring device inside sedimentation tank 3, the wastewater is flocculated and precipitated again.

[0047] As can be seen from Embodiments 1 and 2, in this invention, by controlling the contraction of cylinder 4, the output sections of solid tank 58 and liquid tank 59 are opened simultaneously. This not only completes the feeding of liquid flocculant and the initial flocculation of wastewater, but also simultaneously completes the pre-dissolution of solid flocculant, improving the efficiency of wastewater flocculation and sedimentation. At the same time, during the process of transporting wastewater, the filter screen 696 of submersible pump 61 is cleaned simultaneously to ensure continuous wastewater transport and further improve the flocculation and sedimentation efficiency of wastewater.

[0048] The specific working process and principle of this invention are as follows:

[0049] Step 1: Pulping wastewater is introduced into sedimentation tank 1. Cylinder 4 retracts and pulls lever 2 upward, moving block cone 2 54 into solid box 58. This allows the flocculant particles inside solid box 58 to enter dissolving box 683 and mix with the purified water inside dissolving box 683 in advance, shortening the later dissolving process and improving the purification effect of wastewater.

[0050] At the same time, the lever moves downward in the chute 56 to push the feeding rod 51, causing the blocking cone 52 to move downward. The flocculant liquid inside the liquid tank 59 enters the sedimentation tank 1 along the blocking cone 52. With the help of the stirring device at the bottom of the sedimentation tank 1, the flocculant liquid is fully mixed with the pulping wastewater, achieving the initial flocculation and sedimentation of the pulping wastewater.

[0051] Step 2: Control the water pump 61 to transport the liquid that has undergone preliminary flocculation in the sedimentation tank 1 to the inside of the air bag 67 through the connecting pipe 611, so that the air bag 67 is quickly inflated to the set size. The inflated air bag 67 presses down on the L rod 66, so that the adjusting rod 692 pushes the soft brush 697 down to clean the filter screen 696 at the input end of the water pump 61, so as to prevent the input end of the water pump 61 from being blocked by sedimented impurities and affecting the delivery of liquid.

[0052] Next, control valve 63 is opened to transfer all the liquid inside sedimentation tank 1 to sedimentation tank 3. Then, control valve 682 is opened, and airbag 672 contracts rapidly, flushing the liquid inside into dissolving tank 683 through impact pipe 681, and then into sedimentation tank 3 through discharge pipe 685. With the help of the stirring device inside sedimentation tank 3, the wastewater is flocculated and precipitated again. In this invention, by gradually flocculating and precipitating pulping wastewater, and by using a variety of flocculants in combination, different flocculants can produce a synergistic effect, jointly promoting the destabilization of colloidal particles and the formation of flocs. This synergistic effect can make up for the shortcomings of using a single flocculant, and jointly improve the flocculation effect of pulping wastewater and improve the purification quality of wastewater.

[0053] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A step flocculation and sedimentation device for pulp mill effluent treatment, comprising a sedimentation tank one (1) and a sedimentation tank two (3) and a support frame (2) installed on the rear side walls of both, characterized in that, The top wall of the support frame (2) is vertically fixed with a gas cylinder (4), and the lower portion of the gas cylinder (4) is provided with a dosing mechanism (5) for feeding flocculants. The inside of the sedimentation tank one (1) is provided with a conveying mechanism (6) for conveying wastewater, the conveying mechanism (6) comprises a water pump (61) installed in the inside of the sedimentation tank one (1), the input end of the water pump (61) is provided with a filter screen (696), the output end of the water pump (61) is provided with a conveying pipe (62), the inside wall of the sedimentation tank one (1) is fixedly provided with an L-shaped plate (64), the front side of the L-shaped plate (64) is mounted with an air bag (67), the lower portion of the air bag (67) is provided with an auxiliary assembly for cleaning the filter screen (696); the upper portion of the air bag (67) is provided with an impact assembly, the impact assembly comprises a dissolving tank (683) connected with the output end of the conveying pipe of the solid tank (58); The conveying pipe (62) is connected with the air bag (67) through a communication pipe (611), and the outer wall of the communication pipe (611) is provided with a one-way valve one (65), the front wall of the L-shaped plate (64) is rotatably connected with an L-shaped rod (66) through a rotating shaft, and the bottom side wall of the L-shaped rod (66) is provided with a sliding groove three (610); The one side of the adjusting plate (55) is provided with a sliding groove two (57), the upper portion of the extending end of the gas cylinder (4) is fixedly provided with a stirring rod two, and the stirring rod two is movably connected with the sliding groove two (57), the front wall of the support frame (2) is fixedly connected with a support plate one (511) and a support plate two (513); the outer wall of the support plate two (513) is inserted with a solid tank (58), the bottom end of the extending end of the gas cylinder (4) extends into the solid tank (58) and is fixedly connected with a blocking cone two (54), and the blocking cone two (54) is located in the conveying pipe of the solid tank (58); The outer wall of the support plate one (511) is inserted with a liquid tank (59), the inside of the liquid tank (59) is movably inserted with a feeding rod (51), the top of the feeding rod (51) extends out of the liquid tank (59), and the top wall of the feeding rod (51) is connected with a stirring rod one, the other side of the adjusting plate (55) is provided with a sliding groove one (56), and the stirring rod one is movably connected with the sliding groove one (56); the bottom end of the feeding rod (51) is fixedly connected with a blocking cone one (52), and the blocking cone one (52) is located outside the liquid conveying pipe of the liquid tank (59); The auxiliary assembly comprises a limiting plate (693) and a limiting block (694) connected with the side wall of the sedimentation tank one (1), the limiting plate (693) is slidably connected with an adjusting rod (692), the top of the adjusting rod (692) is fixedly connected with a stirring rod three (691), the stirring rod three (691) is movably connected with the sliding groove three (610), and the outer wall of the adjusting rod (692) is further provided with a baffle (695). The adjusting rod (692) is sleeved with a tension spring on the outer wall of the baffle (695) and the limiting plate (693), and a soft brush (697) is arranged on the bottom side wall of the adjusting rod (692).

2. A step-by-step flocculation and sedimentation device for pulp mill effluent treatment according to claim 1, characterized in that: The output end of the air bag (67) is connected with a dissolving box (683) through an impact pipe (681), a control valve two (682) is arranged on the outer wall of the impact pipe (681), the output end of the dissolving box (683) is connected with a discharge pipe (685), the output end of the discharge pipe (685) is arranged towards the sedimentation tank two (3), and a one-way valve two (684) is arranged on the outer wall of the discharge pipe (685).

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