Mercury-containing wastewater purification treatment device

Abstract

The utility model relates to the technical field of wastewater treatment, and discloses a mercury-containing wastewater purification treatment device which comprises a pre-sedimentation area, a secondary sedimentation area communicated with the pre-sedimentation area, a centralized sedimentation area communicated with the secondary sedimentation area and a purified water sedimentation area communicated with the centralized sedimentation area, the settling pipe assembly comprises a plurality of hollow settling pipes, wastewater particulate matter conveying channels are formed in the settling pipes, and wastewater flocs can be accumulated on the side walls of the settling pipes. According to the technical scheme, particles in the wastewater can slide down along the pipe wall and fall into the collecting device, a coagulant sprayed into the centralized sedimentation area can be conveniently in contact with mercury-containing wastewater at all positions in the pipe and fully react, wastewater flocs are separated out as much as possible, and the mercury-containing wastewater can be recycled. The mercury is gathered on the side wall of the settling pipe and finally falls into the collecting device under the action of gravity, the whole device is simple in structure, and the mercury removal rate of the wastewater treatment device is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a device for purifying and treating mercury-containing wastewater. Background Art

[0002] Mercury has the characteristics of high specific gravity (13.546g / cm3), low melting point (-38.87℃), high boiling point (356.95℃), good electrical conductivity and uniform expansion coefficient, which makes it widely used in industry, agriculture, science and technology, transportation, medicine, health and national defense. According to statistics, more than 80 industries in the world use mercury as raw material, and mercury has more than 3,000 uses. With such widespread use, about 1.5*10 4 Up to 3.0*10 4 t, pollutes the environment through three ways: "waste gas, waste residue, and waste water", among which mercury-containing waste water is the most harmful. Mercury-containing waste water mainly comes from chlor-alkali chemical plants (mercury method), non-ferrous metal smelters (flue gas washing), amalgam method to recover precious metals, pesticide plants (insecticides, fungicides, mildew inhibitors, seed selection agents, etc.), chemical industry (catalysts), paper industry (fungicides, thickeners and flocculant removers, etc.), electrical and electronic industries (connecting circuits, manufacturing switches, light bulbs and batteries, etc.), petrochemical and plastic industries (catalysts), measuring instruments, thermometers, pressure gauges and pharmaceuticals (disinfectants, preservatives, etc.) industries. In addition, explosives, pharmaceuticals, printing and dyeing, cosmetics, photography industries, scientific research institutions and hospital laboratories also discharge a certain amount of mercury-containing waste water.

[0003] The main methods for removing mercury from wastewater include chemical precipitation, metal reduction, activated carbon adsorption, ion exchange, filtration, electrolysis, wool absorption, microbial method, etc. Among them, chemical precipitation is a very common method for removing mercury, which is suitable for different concentrations and types of mercury salts, especially for precipitation of industrial wastewater with high mercury concentration. However, the mercury removal rate of existing wastewater treatment equipment needs to be further improved. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the mercury removal rate of the existing wastewater treatment device is low.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a mercury-containing wastewater purification treatment device, including a pre-sedimentation zone, a secondary sedimentation zone connected to the pre-sedimentation zone, a centralized sedimentation zone connected to the secondary sedimentation zone, and a purified water sedimentation zone connected to the centralized sedimentation zone, wherein the centralized sedimentation zone includes a sedimentation pipe assembly, the sedimentation pipe assembly includes a plurality of hollow sedimentation pipes, the interior of the sedimentation pipe is provided with a wastewater particle conveying channel, and the side wall of the sedimentation pipe can accumulate wastewater flocs.

[0006] In some embodiments, a plurality of the settling tubes are parallel to each other and connected to form a honeycomb structure, the upper end of each of the settling tubes is inclined toward the secondary settling zone, and the lower end of each of the settling tubes is inclined toward the purified water precipitation zone.

[0007] In some embodiments, each of the sedimentation tubes is in the shape of a hexagonal prism, and the length of the side length of the cross section of the sedimentation tube ranges from 2 to 5 mm.

[0008] In some embodiments, the inclination angle of the settling tube ranges from 45° to 75°.

[0009] In some embodiments, the mercury-containing wastewater purification treatment device further includes a collection component, and the collection component is disposed below the centralized sedimentation area.

[0010] In some embodiments, a grid plate is provided between the concentrated settling area and the collection assembly.

[0011] In some embodiments, the mercury-containing wastewater purification treatment device further includes a spraying assembly, and the spraying assembly includes a main pipeline and a spraying pipe.

[0012] In some embodiments, there are a plurality of the spray pipes, and the plurality of the spray pipes are spaced apart above the centralized settling area to spray the coagulant into the centralized settling area.

[0013] In some embodiments, the mercury-containing wastewater purification treatment device further includes an interception component, and the interception component is disposed on a side wall of the concentrated sedimentation zone close to the purified water precipitation zone.

[0014] In some embodiments, the interception component is a box with an open upper end, and the upper end of the side wall of the interception component is configured to be serrated to intercept floating objects in wastewater.

[0015] Through the above technical solution, a settling pipe assembly is arranged in the centralized settling area of ​​the purified water treatment device, and the settling pipe in the settling pipe assembly is designed as a hollow structure, so that the particles in the wastewater can slide down along the pipe wall and fall into the collection device, and the coagulant sprinkled into the centralized settling area can contact and fully react with the mercury-containing wastewater at various positions in the pipe, precipitate as many wastewater flocs as possible, and gather on the side wall of the settling pipe and finally fall into the collection device under the action of gravity. The entire device has a simple structure and greatly improves the mercury removal rate of the wastewater treatment device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the mercury-containing wastewater purification treatment device disclosed in the embodiment of the utility model;

[0018] Figure 2 It is a structural schematic diagram of a settling pipe of a mercury-containing wastewater purification treatment device disclosed in an embodiment of the utility model;

[0019] Figure 3 It is a structural schematic diagram of a grid plate of a mercury-containing wastewater purification treatment device disclosed in an embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of a spraying component of a mercury-containing wastewater purification treatment device disclosed in an embodiment of the utility model;

[0021] Figure 5 It is a schematic cross-sectional structure diagram of a mercury-containing wastewater purification treatment device disclosed in an embodiment of the utility model.

[0022] Description of Reference Numerals

[0023] 1. Pre-sedimentation zone; 101. First water inlet; 102. First water inlet; 2. Secondary sedimentation zone; 201. Second water inlet; 3. Centralized sedimentation zone; 301. Second water inlet; 302. Third water inlet; 303. Sedimentation pipe; 4. Interception assembly; 401. Interception plate; 5. Purified water sedimentation zone; 501. Fourth water inlet; 502. Water outlet; 503. Water outlet; 504. Third water inlet; 6. Grid plate; 7. Collection assembly; 701. Discharge pipe; 8. Spraying assembly; 801. Main pipeline; 802. Spraying pipe. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the implementation of the utility model in conjunction with the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are used to exemplarily illustrate the principles of the utility model, but cannot be used to limit the scope of the utility model. The utility model can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0025] The utility model provides these embodiments to make the utility model thorough and complete, and to fully express the scope of the utility model to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​described in these embodiments should be interpreted as merely exemplary, rather than as limiting.

[0026] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0027] In addition, the words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0028] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0029] All terms used in the present invention have the same meanings as those understood by ordinary technicians in the field to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0031] In order to solve the problem of low mercury removal rate of wastewater treatment devices in the prior art, the utility model provides a mercury-containing wastewater purification treatment device, including a pre-sedimentation zone 1, a secondary sedimentation zone 2 connected to the pre-sedimentation zone 1, a centralized sedimentation zone 3 connected to the secondary sedimentation zone 2, and a purified water sedimentation zone 5 connected to the centralized sedimentation zone 3, wherein the centralized sedimentation zone 3 includes a sedimentation pipe assembly, the sedimentation pipe assembly includes a plurality of hollow sedimentation pipes 303, the interior of the sedimentation pipe 303 is provided with a wastewater particle conveying channel, and the side wall of the sedimentation pipe 303 can accumulate wastewater flocs.

[0032] like Figure 1-2 As shown in Figures 5 and 6, the pre-sedimentation zone 1 is used to settle the particles with the highest density in the mercury-containing wastewater. The pre-sedimentation zone 1 is open at the top, and a first water inlet 102 is provided on the side wall. The first water inlet 102 can accommodate a first water inlet pipe 101, and the first water inlet pipe 101 is connected to an external mercury-containing wastewater pipeline. A discharge port is provided at the bottom of the pre-sedimentation zone 1 to facilitate the discharge of particles. The secondary sedimentation zone 2 is used to settle particles with a higher density in the mercury-containing wastewater. The secondary sedimentation zone 2 is open at the top, and a second water inlet 201 is provided on the side wall adjacent to the pre-sedimentation zone 1, and at least one third water inlet 302 is provided on the side wall adjacent to the concentrated sedimentation zone 3. A discharge port is provided at the bottom of the secondary sedimentation zone 2 to facilitate the discharge of particles.

[0033] The centralized sedimentation area 3 is mainly used to collect the waste materials remaining after the mercury-containing wastewater passes through the pre-sedimentation area 1 and the secondary sedimentation area 2: particles with lower density, flocs formed by the reaction of mercury elements and coagulants, and floating objects. The upper end of the centralized sedimentation area 3 is open, and the third water inlet 302 can accommodate the insertion of the second water inlet pipe 301. Among them, the particles with lower density, the flocs formed by the reaction of mercury elements and coagulants are collected by the sedimentation pipe assembly set in the centralized sedimentation area 3. The sedimentation pipe assembly is composed of a plurality of hollow sedimentation pipes 303, and the hollow sedimentation pipe 303 is a structure with through holes formed on the pipe wall, or can be understood as a pipe surrounded by a plate with through holes. The second water inlet pipe 301 can be selectively docked and connected with a row of sedimentation pipes 303 in the sedimentation pipe assembly close to the secondary sedimentation area 2. Specifically, the outlet end of the second water inlet pipe 301 can be partially inserted into the settling pipe 303, or sleeved on the upper end port of the settling pipe 303, and the docking position of the second water inlet pipe 301 can be inserted into a row of settling pipes 303 near the secondary settling area 2 at equal intervals to evenly pass the wastewater into the settling pipe 303. Since the settling pipe 303 is hollow, the wastewater can quickly enter the entire settling pipe assembly.

[0034] The interior of the settling pipe 303 has a wastewater particle conveying channel, and particles with lower density can slide down the inner wall of the pipe by gravity to the collection device connected to the centralized settling area 3; the side wall of the settling pipe 303 can accumulate wastewater flocs, and since the settling pipe 303 is hollow, wastewater flocs can accumulate on both the inner and outer walls of the settling pipe 303 and gradually form a thin mud layer, that is, in the vertical direction, since the water level rises from bottom to top, the inner wall of the settling pipe 303 also accumulates from bottom to top to form a thin mud layer, and in the horizontal direction, since the settling pipe 303 is hollow, the channels between adjacent settling pipes 303 are connected to each other, so a thin mud layer will also accumulate on the outer wall of the settling pipe 303. The thin mud layers on the inner and outer pipe walls eventually slide down along the pipe wall by gravity to the collection device connected to the centralized settling area 3.

[0035] The purified water sedimentation area 5 is used to collect the particulate matter that has not been collected from the above three sedimentation areas. The upper end of the purified water sedimentation area 5 is open, and a fourth water inlet 501 is provided on the side wall adjacent to the centralized sedimentation area 3, and the fourth water inlet 501 can accommodate the insertion of the third water inlet pipe 504; a water outlet 503 is provided on the side wall opposite to the centralized sedimentation area 3, and a water outlet pipe 502 is connected to the water outlet pipe 503, and the water outlet pipe 502 is connected to the external deep purification device to further purify the mercury-containing wastewater that has been purified. A discharge port is provided at the bottom of the purified water sedimentation area 5 to facilitate the discharge of particulate matter.

[0036] Through the above technical solution, a settling pipe assembly is arranged in the centralized settling area 3 of the purified water treatment device, and the settling pipe 303 in the settling pipe assembly is designed as a hollow structure, so that the particles in the wastewater can slide down along the pipe wall and fall into the collection device, and the coagulant sprinkled into the centralized settling area 3 can be easily contacted with the mercury-containing wastewater at various positions in the pipe and fully reacted, so as to precipitate as many wastewater flocs as possible, and gather on the side wall of the settling pipe 303 and finally fall into the collection device under the action of gravity. The whole device has a simple structure and greatly improves the mercury removal rate of the wastewater treatment device.

[0037] In some embodiments, a plurality of settling tubes 303 are parallel to each other and connected to form a honeycomb structure, the upper end of each settling tube 303 is inclined toward the secondary settling zone 2 , and the lower end of each settling tube 303 is inclined toward the purified water precipitation zone 5 .

[0038] like Figure 5 As shown, adjacent settling tubes 303 in the settling tube assembly share part of the side wall so that the settling tube assembly forms a compact honeycomb structure. On the one hand, this can greatly increase the filtration area of ​​the settling tube assembly, that is, the coagulant can contact and react with the wastewater inside the settling tube 303 more fully, and the mercury element in the wastewater forms flocs and discharges it. On the other hand, it facilitates the movement of particulate matter in the pipeline, avoids clogging the settling tube 303 during the sliding process, and reduces material costs.

[0039] Setting the sedimentation pipe 303 tilted toward the secondary sedimentation zone 2 can facilitate the sedimentation pipe assembly to receive wastewater from the secondary sedimentation zone 2, form a buffer when particulate matter slides in the conveying channel of the sedimentation pipe 303, and facilitate the accumulation of wastewater flocs on the pipe wall.

[0040] In some embodiments, each settling tube 303 is hexagonal, and the length of the side length of the cross section of the settling tube 303 ranges from 2 to 5 mm. Figure 2 As shown, the settling pipe 303 is designed to be a hexagonal prism, that is, the cross section of the settling pipe 303 is a hexagon, so that the edge of the particles can be kept parallel to the cross section of the settling pipe 303, so that wastewater particles of various structures can slide smoothly in the pipe, and the side length of the cross section of the pipe is selected to be 2 to 5 mm according to the general size of mercury-containing wastewater particles in the centralized settling area 3. The settling pipe 303 can also be set to a polygonal prism such as a triangular prism or a quadrangular prism.

[0041] In some embodiments, the inclination angle of the settling tube 303 ranges from 45° to 75°. Figure 5 As shown, the inclination angle of the settling pipe 303 can be adjusted according to the content of particulate matter and mercury in the mercury-containing wastewater and set in the range of 45° to 75°. When the content of particulate matter and mercury is high, the inclination angle can be increased to discharge the waste as soon as possible; when the content of particulate matter and mercury is low, the inclination angle can be reduced.

[0042] In some embodiments, the mercury-containing wastewater purification treatment device further includes a collection component 7, which is disposed below the centralized sedimentation area 3. Figure 1 and 5 As shown, the collecting assembly 7 may be a funnel-shaped structure with an opening at the upper end, mainly used to collect wastewater particles and wastewater flocs sliding down from the settling pipe assembly in the centralized settling area, and a discharge pipe 701 may be provided on the side wall to discharge the aforementioned waste to another waste treatment device. It should be noted that the collecting assembly 7 is only used to collect waste in the centralized settling area 3, and is not connected to the pre-sedimentation area 1, the secondary settling area 2, and the purified water precipitation area 5.

[0043] In some embodiments, a grid plate 6 is provided between the concentrated settling area 3 and the collecting assembly 7. Figure 3 and 5 As shown, the grid plate 6 can further buffer and screen the wastewater particles and wastewater flocs that are about to fall into the collection component 7 from the sedimentation pipe assembly, so that they fall into the collection component 7 evenly, avoiding damage to the collection component 7 caused by excessive impact force.

[0044] In some embodiments, the mercury-containing wastewater purification treatment device further includes a spraying assembly 8, and the spraying assembly 8 includes a main pipeline 801 and a spraying pipe 802. Figure 1 and4 As shown, the spraying assembly 8 is used to spray the coagulant to the centralized sedimentation area 3. The external coagulant tank is connected to the main pipeline 801, and the coagulant pump is pumped into the main pipeline 801 and distributed to each spraying pipe 802. This process can control the coagulant pump to adjust the coagulant spraying amount.

[0045] In some embodiments, there are multiple spray pipes 802, and the multiple spray pipes 802 are arranged at intervals above the centralized settling area 3 to spray the coagulant into the centralized settling area 3. Figure 1 and 4 As shown, the spraying pipes 802 are spaced apart above the centralized settling area 3, so that the coagulant can be sprayed evenly into the centralized settling area 3. Compared with the existing manual direct pouring of the coagulant, the reaction is more complete.

[0046] In some embodiments, the mercury-containing wastewater purification treatment device further includes an interception component 4, which is disposed on the side wall of the concentrated sedimentation area 3 close to the purified water precipitation area 5. Figure 1 and 5 As shown, the interception assembly 4 is used to collect various floating objects in the mercury-containing wastewater that cannot be settled and treated. The interception assembly 4 is arranged on the upper part of the side wall of the concentrated sedimentation area 3 close to the purified water sedimentation area 5.

[0047] In some embodiments, the interception assembly 4 is a box with an open top, and the upper end of the side wall of the interception assembly 4 is configured to be serrated to intercept floating objects in the wastewater. Figure 1 and 5 As shown, the interception assembly 4 is configured to be open at the upper end so that the wastewater can immerse the interception assembly 4, and the width of the interception assembly 4 can be slightly smaller than the width of the concentrated sedimentation area 3, so that the serrated upper end of the side wall can intercept as much wastewater floating matter as possible. The wastewater floating matter intercepted by the interception assembly 4 needs to be manually collected and removed regularly.

[0048] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0049] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A mercury-containing wastewater purification treatment device, characterized in that: The invention comprises a pre-sedimentation zone (1), a secondary sedimentation zone (2) connected to the pre-sedimentation zone (1), a centralized sedimentation zone (3) connected to the secondary sedimentation zone (2), and a purified water sedimentation zone (5) connected to the centralized sedimentation zone (3), wherein the centralized sedimentation zone (3) comprises a sedimentation pipe assembly, the sedimentation pipe assembly comprises a plurality of hollow sedimentation pipes (303), the interior of the sedimentation pipe (303) comprises a wastewater particle conveying channel, and the side wall of the sedimentation pipe (303) is capable of accumulating wastewater flocs.

2. The mercury-containing wastewater purification treatment device according to claim 1, characterized in that: The plurality of sedimentation tubes (303) are parallel to each other and connected to form a honeycomb structure, the upper end of each sedimentation tube (303) is inclined toward the secondary sedimentation zone (2), and the lower end of each sedimentation tube (303) is inclined toward the purified water precipitation zone (5).

3. The mercury-containing wastewater purification treatment device according to claim 2, characterized in that: Each of the sedimentation tubes (303) is in the shape of a hexagonal prism, and the length of the side length of the cross section of the sedimentation tube (303) ranges from 2 to 5 millimeters.

4. The mercury-containing wastewater purification treatment device according to claim 2, characterized in that: The inclination angle of the sedimentation tube (303) ranges from 45° to 75°.

5. The mercury-containing wastewater purification treatment device according to claim 1, characterized in that: The mercury-containing wastewater purification treatment device further comprises a collecting component (7), and the collecting component (7) is arranged below the concentrated sedimentation area (3).

6. The mercury-containing wastewater purification treatment device according to claim 5, characterized in that: A grid plate (6) is provided between the concentrated sedimentation area (3) and the collection assembly (7).

7. The mercury-containing wastewater purification treatment device according to claim 1, characterized in that: The mercury-containing wastewater purification treatment device further comprises a spraying assembly (8), wherein the spraying assembly (8) comprises a main pipeline (801) and a spraying pipe (802).

8. The mercury-containing wastewater purification treatment device according to claim 7, characterized in that: There are a plurality of spraying pipes (802), and the plurality of spraying pipes (802) are arranged at intervals above the centralized sedimentation area (3) to spray the coagulant into the centralized sedimentation area (3).

9. The mercury-containing wastewater purification treatment device according to claim 1, characterized in that: The mercury-containing wastewater purification treatment device further comprises an interception component (4), and the interception component (4) is arranged on the side wall of the concentrated sedimentation area (3) close to the purified water precipitation area (5).

10. The mercury-containing wastewater purification treatment device according to claim 9, characterized in that: The interception component (4) is a box body with an open upper end, and the upper end of the side wall of the interception component (4) is configured to be serrated to intercept floating objects in wastewater.

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