Metal removal and recovery device

Abstract

The utility model discloses a metal removal and recovery device which comprises a support, an adjusting tank, a coagulation tank and a flocculation tank are fixed on the support, stirring motors are arranged on the top of the adjusting tank, the top of the coagulation tank and the top of the flocculation tank respectively, the stirring motors are connected with internal stirring paddles, a waste water inlet and a chemical feeding port are formed in the adjusting tank, and the chemical feeding port is connected with the stirring paddles. The adjusting tank is further provided with a communicated alkali liquor tank, a discharging port in the bottom of the adjusting tank is connected with a first pipeline mixer through a pipeline, the first pipeline mixer is communicated with the coagulation tank through a pipeline, and a first feeding pump is arranged between the first pipeline mixer and the adjusting tank. The first pipeline mixer and the second pipeline mixer are arranged, so that wastewater and PAC or PAM can be mixed more uniformly, the collision probability is increased during initial contact, and compared with traditional stirring and mixing, formation and growth of flocculates are more facilitated, so that a better sedimentation effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater metal ion treatment, in particular to a metal removal and recovery device. Background Art

[0002] With the continuous advancement of urbanization and industrialization, industrial wastewater is increasing day by day. Industrial wastewater contains a large amount of heavy metal substances. In the ecological environment, heavy metals are not only unable to degrade, but will continue to accumulate in the food chain through biomagnification, and eventually enter the human body, causing harm to the body; if directly discharged, it will not only cause a large amount of resource waste, but also pollute the environment.

[0003] Heavy metals in wastewater are usually removed by electrolysis, ion exchange and chemical precipitation. Among them, the chemical precipitation method is a method of adding heavy metal scavengers to heavy metal wastewater to cause a chemical reaction to turn heavy metal ions into insoluble substances and precipitate and separate them. Due to its simple process, wide removal range, economy and practicality, it can complete the reaction process at room temperature and a wide pH range, and is not affected by the low concentration of heavy metal ions, so it is widely used. After adding the heavy metal scavenger, the heavy metals are initially precipitated. In order to quickly form particles, flocculants PAC and PAM need to be added. After flocculation, it needs to be left to settle for solid-liquid separation.

[0004] The existing technology usually directly adds flocculants PAC and PAM into the reaction tank and performs flocculation operation under stirring. Due to the characteristics of the flocculant itself, flocculation that is too fast or too slow will affect the sedimentation effect. In the early stage of the reaction when the flocculant is added, the chance of contact between the agent and the sewage should be increased as much as possible, and the stirring or flow rate should be increased. The speed is increased by the collision of the water flow with the folding plate and the multiple turns of the water flow between the folding plates, which increases the chance of collision of particles in the water and causes the flocs to coagulate. In the later stage of the reaction, in order to reduce the velocity gradient, better flocculation and sedimentation effects can be obtained. The traditional stirring method requires a very fast rotation speed to increase the chance of contact and collision between the flocculant and the sewage, which is not conducive to operation. In addition, the existing sedimentation methods mostly use natural sedimentation, which has a slow sedimentation speed and generally requires a separate sedimentation tank. Utility Model Content

[0005] 1. Technical problems to be solved:

[0006] In view of the above technical problems, the utility model provides a metal removing and recycling device.

[0007] 2. Technical solution:

[0008] A metal removal and recovery device comprises a bracket, on which a regulating tank, a coagulation tank and a flocculation tank are fixed, wherein the tops of the regulating tank, the coagulation tank and the flocculation tank are all provided with a stirring motor, the stirring motor is connected to an internal stirring paddle, a wastewater inlet and a drug feeding port are provided on the regulating tank, a connected alkali liquid tank is also provided on the regulating tank, a bottom discharge port of the regulating tank is connected to a first pipeline mixer through a pipeline, the first pipeline mixer is connected to the coagulation tank through a pipeline, a first feeding pump is provided between the first pipeline mixer and the regulating tank, a top feeding port of the first pipeline mixer is connected to a first drug storage tank through a pipeline, the first drug storage tank is used to store a PAC solution, The bottom discharge port of the coagulation tank is connected to the second pipeline mixer through a pipeline, the second pipeline mixer is connected to the flocculation tank through a pipeline, a second feeding pump is arranged between the second pipeline mixer and the coagulation tank, the top feeding port of the second pipeline mixer is connected to the second medicine storage tank through a pipeline, the second medicine storage tank is used to store PAM solution, the bottom of the tank body of the flocculation tank is set to be conical, which is used for the sedimentation and collection of flocculants, the bottom discharge port of the flocculation tank is connected to the filter element, the filter element is connected to the feed pump through a pipeline, a clean water outlet is also provided on the flocculation tank, an aeration pipe is also provided on the inner side of the flocculation tank, and the aeration pipe is connected to an external aerator through a pipeline.

[0009] Furthermore, the regulating tank, the coagulation tank, the flocculation tank, the alkali liquid tank, the first medicine storage tank and the second medicine storage tank are all equipped with liquid level meters.

[0010] Furthermore, a pH monitor is installed on the regulating tank.

[0011] Furthermore, flow regulating valves are provided between the regulating tank and the alkali liquid tank, the regulating tank and the first pipeline mixer, the first medicine storage tank and the first pipeline mixer, the coagulation tank and the second pipeline mixer, and the second medicine storage tank and the second pipeline mixer.

[0012] Furthermore, a sedimentation inclined plate is provided in the flocculation tank, and the sedimentation inclined plate is arranged between the clean water outlet and the aeration pipe.

[0013] Furthermore, the first pipeline mixer and the second pipeline mixer each include a pipe body, a spiral guide plate is arranged in the pipe body, and three flange joints are arranged on the pipe body.

[0014] 3. Beneficial effects:

[0015] (1) The utility model provides a first pipeline mixer and a second pipeline mixer, and adjusts the mixing ratio of wastewater and PAC or PAM in the pipeline mixer through a flow control valve. The pipeline mixer can make the wastewater and PAC or PAM mixed more evenly, increase the collision probability during the initial contact, and is more conducive to the formation and growth of flocculants compared to traditional stirring mixing, so as to achieve a better sedimentation effect.

[0016] (2) The utility model can achieve rapid sedimentation of flocculants by setting up aeration pipes, aeration machines and sedimentation inclined plates. There is no need to design a separate sedimentation tank. Complete sedimentation can be achieved in a short time, saving site costs and equipment costs. After sedimentation, the flocculants are filtered and collected by the filter element, and the captured metals can be quickly recovered. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the metal removal and recovery device of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the flocculation tank of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the first pipeline mixer or the second pipeline mixer of the utility model. DETAILED DESCRIPTION

[0020] The utility model is described in detail below in conjunction with the accompanying drawings.

[0021] As attached Figure 1 To Attachment Figure 3 As shown,

[0022] Specific embodiment: A metal removal and recovery device comprises a bracket 1, on which a regulating tank 2, a coagulation tank 3 and a flocculation tank 4 are fixed, and a stirring motor 5 is provided on the top of each of the regulating tank 2, the coagulation tank 3 and the flocculation tank 4, and the stirring motor 5 is connected to an internal stirring paddle 6, and a wastewater inlet and a dosing port (not shown in the figure) are provided on the regulating tank 2, and a connected alkali liquid tank 7 is also provided on the regulating tank 2, and a bottom discharge port of the regulating tank 2 is connected to a first pipeline mixer 8 through a pipeline, and the first pipeline mixer 8 is connected to the coagulation tank 3 through a pipeline, and a first feeding pump 9 is provided between the first pipeline mixer 8 and the regulating tank 2, and a top feed port of the first pipeline mixer 8 is connected to a first drug storage tank 10 through a pipeline, and the first drug storage tank 10 is used to store PAC solution, The bottom discharge port of the coagulation tank 3 is connected to the second pipeline mixer 11 through a pipeline, and the second pipeline mixer 11 is connected to the flocculation tank 4 through a pipeline. A second feeding pump 12 is arranged between the second pipeline mixer 11 and the coagulation tank 3, and the top feeding port of the second pipeline mixer 11 is connected to the second medicine storage tank 13 through a pipeline. The second medicine storage tank 13 is used to store PAM solution. The bottom of the tank body of the flocculation tank 4 is set to be conical for the sedimentation and collection of flocculants. The bottom discharge port of the flocculation tank 4 is connected to the filter element 14, and the filter element 14 is connected to the feed pump 15 through a pipeline. The flocculation tank 4 is also provided with a clean water outlet 16, and the inner side of the flocculation tank 4 is also provided with an aeration pipe 17, and the aeration pipe 17 is connected to an external aerator through a pipeline.

[0023] Liquid level meters 18 are installed on the regulating tank 2, the coagulation tank 3, the flocculation tank 4, the alkali liquid tank 7, the first drug storage tank 10 and the second drug storage tank 13 to collect the liquid level conditions inside the tank bodies.

[0024] The regulating tank 2 is also provided with a pH monitor 19 for monitoring the pH value change inside the regulating tank 2 .

[0025] Flow regulating valves 20 are provided between the regulating tank 2 and the alkali liquid tank 7, the regulating tank 2 and the first pipeline mixer 8, the first medicine storage tank 10 and the first pipeline mixer 8, the coagulation tank 3 and the second pipeline mixer 11, and the second medicine storage tank 13 and the second pipeline mixer 11. The flow regulating valves 20 are used to adjust the liquid inlet amount to meet the mixing of different proportions.

[0026] A sedimentation sloping plate 21 is also provided in the flocculation tank 4. The sedimentation sloping plate 21 is arranged between the clean water outlet 16 and the aeration pipe 17 to enhance the sedimentation effect and realize the rapid sedimentation of the flocculants.

[0027] The first pipeline mixer 8 and the second pipeline mixer 11 both include a pipe body 22, a spiral guide plate is provided inside the pipe body 22, and three flange joints 23 are provided on the pipe body 22. After the PAC solution and the PAM solution are mixed with the wastewater, they are transported in a spiral shape to increase the collision probability and achieve rapid mixing.

[0028] When the metal removal and recovery device of the utility model is working, wastewater containing metal ions is first pumped into the regulating tank 2 from the wastewater inlet, heavy metal ion capture agent is added through the dosing port to capture heavy metals, sodium hydroxide solution is added into the regulating tank 2 through the alkali liquid tank 7 to adjust the pH to alkaline, so that the heavy metal ions under alkaline conditions form hydroxides and settle, stirring is turned on during the adjustment process, and the wastewater is further pumped into the coagulation tank 3. In the process of entering the coagulation tank 3, the wastewater first enters the first pipeline mixer 8, and the feeding speed of the wastewater and the PAC solution is adjusted through the flow regulating valve 20 to meet the appropriate ratio. The wastewater is more fully contacted with the PAC solution in the initial stage of mixing, which is conducive to increasing the chance of particle collision and making the flocs Coagulation, compared with the existing stirring contact is more sufficient, the wastewater mixed with PAC solution into the coagulation tank 3 is stirred, promote the growth of flocculation, because before entering the coagulation tank 3, the wastewater and PAC solution have been mixed evenly, therefore, the stirring speed does not need to be particularly fast, and the speed can be adjusted to be suitable for the growth of floccules; further pump the wastewater in the coagulation tank 3 into the flocculation tank 4, the wastewater is first mixed evenly with the PAM solution in the second pipeline mixer 11 before entering the flocculation tank 4, and the feeding speed of the wastewater and the PAM solution is adjusted by the flow regulating valve 20. Similarly, the initial contact of the wastewater with the PAM solution is more sufficient, which is conducive to increasing the collision opportunities of particles and making the flocs coagulate, and stirring is turned on to promote the growth of flocculation. When the floccules settle, the aerator is turned on for aeration, and the gas can settle quickly when it contacts the floccules with a larger deadweight than water, and the settling is further accelerated by the settling inclined plate 21. The settled floccules are concentrated at the conical bottom of the flocculation tank 4, and the upper clean water is discharged through the clean water outlet 16. After the discharge, the bottom floccules and waste water are pumped into the filter element 14 for filtration through the suction pump 15 to recover the captured metals.

[0029] Although the present invention has been disclosed as above in terms of preferred embodiments, they are not intended to limit the present invention. Anyone skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection defined by the claims of this application.

Claims

1. A metal removal and recovery device, characterized in that: The invention comprises a bracket, on which a regulating tank, a coagulation tank and a flocculation tank are fixed, wherein the tops of the regulating tank, the coagulation tank and the flocculation tank are all provided with stirring motors, the stirring motors are connected to internal stirring paddles, the regulating tank is provided with a wastewater inlet and a dosing port, the regulating tank is also provided with a connected alkali liquid tank, the bottom discharge port of the regulating tank is connected to a first pipeline mixer through a pipeline, the first pipeline mixer is connected to the coagulation tank through a pipeline, a first feeding pump is provided between the first pipeline mixer and the regulating tank, the top feed port of the first pipeline mixer is connected to a first drug storage tank through a pipeline, the first drug storage tank is used to store PAC solution, The bottom discharge port of the coagulation tank is connected to the second pipeline mixer through a pipeline, the second pipeline mixer is connected to the flocculation tank through a pipeline, a second feeding pump is arranged between the second pipeline mixer and the coagulation tank, the top feeding port of the second pipeline mixer is connected to the second medicine storage tank through a pipeline, the second medicine storage tank is used to store PAM solution, the bottom of the tank body of the flocculation tank is set to be conical, which is used for the sedimentation and collection of flocculants, the bottom discharge port of the flocculation tank is connected to the filter element, the filter element is connected to the feed pump through a pipeline, a clean water outlet is also provided on the flocculation tank, an aeration pipe is also provided on the inner side of the flocculation tank, and the aeration pipe is connected to an external aerator through a pipeline.

2. A metal removal and recovery device according to claim 1, characterized in that: The regulating tank, the coagulation tank, the flocculation tank, the alkali liquid tank, the first medicine storage tank and the second medicine storage tank are all equipped with liquid level meters.

3. A metal removal and recovery device according to claim 2, characterized in that: The regulating tank is also equipped with a pH monitor.

4. A metal removal and recovery device according to any one of claims 1 to 3, characterized in that: Flow regulating valves are arranged between the regulating tank and the alkali liquid tank, the regulating tank and the first pipeline mixer, the first medicine storage tank and the first pipeline mixer, the coagulation tank and the second pipeline mixer, and the second medicine storage tank and the second pipeline mixer.

5. A metal removal and recovery device according to claim 4, characterized in that: The flocculation tank is also provided with a sedimentation inclined plate, which is arranged between the clean water outlet and the aeration pipe.

6. A metal removal and recovery device according to claim 5, characterized in that: The first pipeline mixer and the second pipeline mixer both include a pipe body, a spiral guide plate is arranged in the pipe body, and three flange joints are arranged on the pipe body.

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