Device for recycling coagulant and co-producing humic acid by using coagulation precipitate

Abstract

The utility model relates to the technical field of humic acid extraction, in particular to a device for recycling coagulant and co-producing humic acid by using coagulated sediment, which comprises a tank body and a reaction kettle, a filter membrane is arranged in the tank body, a reaction bin is arranged above the filter membrane in the tank body, a filtrate bin is arranged below the filter membrane in the tank body, and the reaction bin is provided with a first feed port and a second feed port; a first liquid outlet is formed in the bottom of the filtrate bin; the tank body is provided with a compression mechanism, the compression mechanism comprises a pushing and pressing plate which moves up and down in the tank body, and the pushing and pressing plate is located in the reaction bin; the reaction kettle is connected with the reaction bin through a discharging pipe, one end part of the discharging pipe, which is positioned in the reaction bin, is adjacent to the upper side of the filtering membrane, the reaction kettle is provided with a third feeding hole and a second liquid outlet, and the third feeding hole is used for adding a pure coagulant. By utilizing the device, the leachate coagulation precipitate and the leaching solution can be fully reacted and separated, and the coagulant is recycled, so that the resource reutilization of wastes is realized, the utilization rate of the coagulant is improved, and the combined produced humic acid can generate economic benefits.

Description

TECHNICAL FIELD

[0001] The utility model relates to humic acid extraction technical field, concretely relates to a device for recycling coagulant and parallel production humic acid by coagulation precipitate. BACKGROUND

[0002] The main goal of landfill leachate wastewater treatment is to remove organic pollutants, ammonia nitrogen, heavy metals and suspended solids in it, and to ensure that the water quality after treatment meets the national discharge standard. The commonly used treatment processes include physical treatment method, chemical treatment method and biological treatment method, as well as advanced oxidation and membrane separation technology. Physical treatment method is often used as pretreatment of landfill leachate, which is used to remove large particle suspended solids and reduce pollution load. Chemical treatment method is to add chemical reagents to the leachate, so that the pollutants can be chemically reacted and separated. The commonly used chemical treatment methods are coagulation sedimentation method, oxidation-reduction method and chemical precipitation method. Among them, the coagulation sedimentation method is: by adding coagulant (such as polyaluminum chloride, polyacrylamide), the colloidal substances in the wastewater form flocculation, so as to be separated by sedimentation. The leachate coagulation sedimentation contains a lot of humic acid, and organic fertilizer is a fertilizer containing humic acid and other humic substances. Therefore, it has become a consensus to extract and utilize humic acid from landfill leachate coagulation sedimentation. However, the remaining mixture after extracting humic acid is not utilized, which causes waste of resources. SUMMARY

[0003] The utility model aims at providing a device for recycling coagulant and parallel production humic acid by coagulation precipitate, which can extract humic acid from landfill leachate coagulation sedimentation and recycle coagulant in the remaining mixture.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] The device for recycling coagulant and parallel production humic acid by coagulation precipitate comprises a tank body and a reaction kettle, a filter membrane is arranged in the tank body, an upper portion of the filter membrane in the tank body is a reaction bin, and a lower portion of the filter membrane in the tank body is a filtrate bin, the reaction bin is provided with a first feeding port and a second feeding port, and the first feeding port and the second feeding port are respectively used for adding coagulation precipitate and leaching liquid; a bottom portion of the filtrate bin is provided with a first liquid outlet; the tank body is provided with a compression mechanism, the compression mechanism comprises a push plate which moves up and down along the tank body, and the push plate is located in the reaction bin;

[0006] The reaction kettle is connected with the reaction bin through a discharge pipe, an upper side of the filter membrane is located at one end portion of the reaction bin, the reaction kettle is provided with a third feeding port and a second liquid outlet, and the third feeding port is used for adding pure coagulant.

[0007] Further, the compression mechanism further comprises an electric push rod outside the tank body, a displaceable rod body of the electric push rod is through the top of the tank body and connected with the push plate, and the outer peripheral wall of the push plate is in sliding sealing fit with the inside of the tank body in the up-down direction.

[0008] Further, the top of the tank body is provided with a vent hole.

[0009] Further, the reaction bin is connected with a flushing pipe for flushing the filter cake on the filter membrane after compression filtration is completed.

[0010] Further, the filter membrane is arranged in an inclined manner, and the side of the filter membrane close to the discharge pipe is a low point.

[0011] Further, the flushing pipe comprises a water inlet pipe and a water distribution pipe, the water distribution pipe is an annular pipe, the water distribution pipe is connected with the water inlet pipe, the water distribution pipe is embedded in the inner wall of the tank body, the water distribution pipe has a plurality of water spray holes distributed in the circumferential direction of the water distribution pipe, and the water spray holes are arranged in an inclined downward manner.

[0012] Further, a filling layer is arranged in the gap between the water distribution pipe and the embedding groove of the tank body, and the inner side surface of the filling layer is coplanar with the inner wall surface of the tank body.

[0013] The beneficial effects of the utility model are as follows:

[0014] The device of the utility model fully reacts and separates the leachate coagulation sediment and the leaching liquid, recycles the coagulant, and produces humic acid in parallel, realizes the resource recycling of waste, improves the utilization rate of the coagulant, reduces the cost, saves resources and energy consumption through recycling the coagulant, and the produced humic acid can also produce economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structure schematic view of the device for recycling the coagulant and producing humic acid in parallel by the coagulation sediment of the utility model;

[0016] Figure 2 It is the structure schematic view of the flushing pipe;

[0017] Figure 3 It is the exploded schematic view of the flushing pipe;

[0018] Figure 4 It is the principle schematic view of the device for recycling the coagulant and producing humic acid in parallel by the coagulation sediment of the utility model.

[0019] Corresponding names of various marks in the drawing are as follows:

[0020] 1. Tank body; 11. Reaction chamber; 12. Filtration chamber; 2. Filter membrane; 31. First feed inlet; 32. Second feed inlet; 33. Water inlet pipe; 34. Water distribution pipe; 341. Water spray hole; 35. Rubber stopper; 36. Sealing gasket; 4. Compression mechanism; 41. Push plate; 42. Electric push rod; 5. Discharge pipe; 6. Reactor; 7. Stirring device; 81. Third feed inlet; 82. Second liquid outlet. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0022] Embodiments of this utility model:

[0023] like Figures 1-4 As shown, an apparatus for recycling coagulant and producing humic acid using coagulated precipitate includes a tank 1 and a reaction vessel 6. A filter membrane 2 is installed inside the tank 1. Above the filter membrane 2 is a reaction chamber 11, and below the filter membrane 2 is a filtrate chamber 12. The reaction chamber 11 has a first inlet 31 and a second inlet 32, used for adding coagulated precipitate and leachate, respectively. The coagulated precipitate and leachate react in the reaction chamber 11, leaching humic acid from the coagulated precipitate. The leachate can use existing organic solvents such as dimethyl sulfoxide, but the specific type of organic solvent is not a protected feature of this invention and is not limited thereto. Both the first inlet 31 and the second inlet 32 ​​are connected to corresponding feed pipes, each equipped with an electric valve that opens during feeding and closes after feeding is complete.

[0024] The bottom of the filtrate chamber 12 is provided with a first outlet (not shown), which is used to discharge the filtrate when needed. The first outlet is connected to a corresponding feed pipe, which is also equipped with an electric valve.

[0025] The tank 1 is equipped with a compression mechanism 4, which includes a pusher plate 41 that moves vertically within the tank 1 and is located in the reaction chamber 11. The compression mechanism 4 only activates after the materials in the reaction chamber 11 have reacted to a certain extent, ensuring that the materials in the reaction chamber 11 react fully. The compression mechanism 4 also includes an electric push rod 42 located on the outside of the tank 1. The movable rod of the electric push rod 42 passes through the top of the tank 1 and is connected to the pusher plate 41. The outer peripheral wall of the pusher plate 41 is in a sliding, sealing fit with the interior of the tank 1 in the vertical direction. A sealing ring can be fitted into the outer peripheral wall of the pusher plate 41 to achieve a fit with the inner wall of the tank 1.

[0026] The top of the tank 1 is provided with a vent hole (not shown), when the compression mechanism 4 is in action, the space above the push plate 41 of the reaction chamber 11 is balanced with the pressure outside the tank 1.

[0027] The reaction kettle 6 is connected with the reaction chamber 11 through the discharge pipe 5, and the end of the discharge pipe 5 close to the upper side of the filter membrane 2 is located at one end of the reaction chamber 11. The discharge pipe 5 is arranged obliquely, which is beneficial to the discharge of the material in the reaction chamber 11.

[0028] Further, the filter membrane 2 is arranged obliquely, and the side close to the discharge pipe 5 of the filter membrane 2 is the low point. The side close to the discharge pipe 5 of the filter membrane 2 is low, and the other side is high, which is beneficial to the discharge of the material. The oblique angle of the filter membrane 2 can be 5° to 7°, which can utilize the oblique flow of the material to the other side, and does not affect the normal filtrate function.

[0029] The reaction kettle 6 is provided with a third feeding port 81 and a second liquid outlet 82, and the third feeding port 81 is used for adding pure coagulant. The third feeding port 81 and the second liquid outlet 82 are connected with corresponding pipes, and the pipes are provided with electric valves. The third feeding port 81 is opened when feeding, and the second liquid outlet 82 is opened when discharging. After the filtration of the mixed material in the reaction chamber 11 is completed, the remaining solid material, which can also be called filter cake, is sent into the reaction kettle 6, and the coagulant contained in the filter cake is mixed with the newly added pure coagulant, so as to achieve the purpose of reusing the coagulant.

[0030] The reaction chamber 11 is connected with a flushing pipe, which is used for flushing the filter cake on the filter membrane 2 after the compression filtration is completed.

[0031] The flushing pipe includes a water inlet pipe 33 and a water distribution pipe 34. The water distribution pipe 34 is an annular pipe, and is connected with the water inlet pipe 33. The water distribution pipe 34 is embedded in the inner wall of the tank 1, and has a plurality of water injection holes 341 distributed in the circumferential direction of the water distribution pipe 34. The water injection holes 341 are arranged obliquely downward. The inner wall of the tank 1 is annularly provided with an embedded groove for installing the water distribution pipe 34.

[0032] The part of the water inlet pipe 33 outside the tank 1 is provided with an electric valve for controlling the on-off of the water flow. The inner end of the water inlet pipe 33 is connected with the water distribution pipe 34. The water inlet pipe 33 is screwed on the wall of the tank 1, and is insertedly connected with the water distribution pipe 34. The insertion fit parts of the water inlet pipe 33 and the water distribution pipe 34 are provided with a sealing gasket 36 for sealing fit. The inner end of the water inlet pipe 33 is a small diameter section, which can be inserted into the water distribution pipe 34. The step formed by the inner end of the water inlet pipe 33 and the water inlet body is used for pressing the sealing gasket 36.

[0033] In order to facilitate the assembly of the water distribution pipe 34, the water distribution pipe 34 is designed as two arc-shaped pipe segments, and the pipe openings of the arc-shaped pipe segments are connected by rubber plugs 35; the design of two arc-shaped pipe segments instead of one whole circle makes it have certain flexibility during installation, and finally the rubber plugs 35 are used for soft connection, and the joint of the two is tightly matched after the sleeve connection, which can ensure no water leakage; the two ends of the rubber plug 35 are designed as tapered portions, facilitating the plug-in installation with the arc-shaped pipe segments. One of the arc-shaped pipe segments can be provided with two spaced water spray holes 341, and the other arc-shaped pipe segment is designed with three spaced water spray holes 341, so that the water spray directions can be staggered, and the filter cake after washing is turbid liquid, which flows into the reaction kettle 6 outside the tank 1 through the discharge pipe 5. In other embodiments, three water spray holes can be provided in one arc-shaped pipe segment, and four water spray holes are designed in the other arc-shaped pipe segment.

[0034] A filling layer is arranged in the gap between the water distribution pipe 34 and the embedding groove of the tank 1, and the inner side surface of the filling layer is coplanar with the inner wall surface of the tank 1. The filling layer can be waterproof sealant, such as plastic steel mud; or polyurethane glue is used for bottoming during installation, which has a certain caulking effect, and the lower surface is repaired after completion. The manhole structure designed on the tank 1 is convenient for installation and maintenance.

[0035] The device for recycling coagulant and producing humic acid in parallel by using coagulation sediment is characterized in that:

[0036] The coagulation sediment passes through the first feeding port 31, and the leaching liquid passes through the second feeding port 32 to enter the reaction bin 11 together. After the coagulation sediment and the leaching liquid are fully reacted in the reaction bin 11, the push plate 41 is pushed downward to apply pressure, and the mixed material is compressed. The filtrate enters the filtrate bin 12, and after the pressure filtration is completed, the push plate 41 moves upward. The filter membrane 2 is a filter membrane of micron level and a rigid filter plate supporting the filter membrane. When there is no pressure difference, the filtrate basically does not leak downward. When the push plate 41 is downward, the compression effect is generated, and the pressure above the filter membrane is greater than that below the filter membrane, and then the filtrate starts to leak downward. The flushing pipe starts to feed water, and the water spray holes 341 on the water distribution pipe 34 are used to wash the filter cake on the filter membrane 2, and the mixture formed flows into the discharge pipe 5 and finally enters the reaction kettle 6. Part of the pure coagulant is injected into the reaction kettle 6 through the third feeding port 81, the stirring device 7 is opened, and the filter cake and the pure coagulant in the mixture are fully mixed and discharged through the second liquid outlet 82 for coagulation treatment of landfill leachate, so as to achieve the purpose of recycling coagulant. The stirring device 7 of the reaction kettle 6 is the existing structure, which is mature and will not be described in detail. In other embodiments, the stirring device can also not be used.

[0037] The utility model discloses full reaction separation, recycling coagulant and byproduct humic acid of leachate coagulation sediment, not only realize the resource reutilization of waste, but also improve the utilization of coagulant, reduce the cost.

[0038] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0039] In the utility model, unless otherwise expressly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact of the first and second features, or indirect contact of the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

Claims

1. A device for recycling coagulant using coagulation sediment and co-producing humic acid, characterized in that: The device comprises a tank and a reaction kettle, the tank is provided with a filter membrane, the tank is provided with a reaction bin above the filter membrane and a filtrate bin below the filter membrane, the reaction bin is provided with a first feeding port and a second feeding port for adding coagulation precipitate and leaching liquid respectively, the bottom of the filtrate bin is provided with a first liquid outlet, the tank is provided with a compression mechanism, the compression mechanism comprises a push plate moving up and down in the tank, and the push plate is located in the reaction bin; The reaction kettle is connected with the reaction bin through a discharge pipe, the upper side of the filter membrane is located at one end of the reaction bin, the reaction kettle is provided with a third feeding port and a second liquid outlet, and the third feeding port is used for adding pure coagulant.

2. The apparatus for producing humic acid in parallel with recycling coagulant using coagulation sediment according to claim 1, wherein: The compression mechanism further comprises an electric push rod located outside the tank, the displaceable rod body of the electric push rod penetrates through the top of the tank and is connected with the push plate, and the outer peripheral wall of the push plate is in sliding sealing fit with the inner wall of the tank in the up-down direction.

3. The apparatus for producing humic acid in parallel with recycling coagulant using coagulation sediment according to claim 2, wherein: The top of the tank is provided with a vent hole.

4. The apparatus for producing humic acid in parallel with recycling coagulant using coagulation sediment according to claim 1, wherein: The reaction bin is connected with a flushing pipe for flushing the filter cake on the filter membrane after the compression filtration is completed.

5. The apparatus for producing humic acid in parallel with recycling coagulant using coagulation sediment according to claim 4, wherein: The filter membrane is arranged obliquely, and the side of the filter membrane close to the discharge pipe is the low point.

6. The apparatus for producing humic acid in parallel with recycling coagulant using coagulation sediment according to claim 5, wherein: The flushing pipe comprises a water inlet pipe and a water distribution pipe, the water distribution pipe is an annular pipe, the water distribution pipe is connected with the water inlet pipe, the water distribution pipe is embedded in the inner wall of the tank, the water distribution pipe has a plurality of water injection holes distributed in the circumferential direction of the water distribution pipe, and the water injection holes are arranged obliquely downward.

7. The apparatus for producing humic acid in parallel with recycling coagulant using coagulation sediment according to claim 6, wherein: The gap between the water distribution pipe and the embedded groove of the tank is provided with a filling layer, and the inner side surface of the filling layer is coplanar with the inner wall surface of the tank.

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