Mercury removal device based on wastewater treatment
The design of the premixing mechanism and stirring shaft system solves the problem of insufficient mixing between coagulant and wastewater, achieving rapid and thorough mixing of wastewater to meet environmental standards.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-03-03
AI Technical Summary
In existing technologies, when coagulants are added to wastewater, they cannot be mixed quickly and thoroughly, resulting in low wastewater treatment efficiency.
The system employs a premixing mechanism and a stirring shaft system. The stirring shaft and stirring shaft are driven by a drive motor to rotate, so as to achieve uniform dispersion of coagulant and water after premixing. Combined with the design of the diversion chamber, it ensures that the coagulant is quickly and fully mixed in the wastewater.
It improves the mixing efficiency of coagulant and wastewater, ensuring the speed and adequacy of the wastewater treatment process and meeting the "Integrated Wastewater Discharge Standard".
Smart Images
Figure CN223963324U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment technology, specifically a mercury removal device based on wastewater treatment. Background Technology
[0002] Mercury-containing wastewater is mainly generated from industrial activities such as chlor-alkali plants, smelters (copper / zinc), battery manufacturing (mercury batteries), pesticide production (organomercury bactericides), and medical waste (thermometers / mercury-containing drugs). During treatment, mercury must be removed to prevent mercury from causing neurodegenerative diseases such as Minamata disease through bioaccumulation, and the wastewater must meet the "Integrated Wastewater Discharge Standard".
[0003] When removing mercury from wastewater, a coagulant needs to be added to the wastewater and mixed with it. The coagulant forms flocs that adsorb mercury ions. After subsequent precipitation and activated carbon adsorption processes, the mercury removal from the wastewater is finally completed.
[0004] However, in the existing technology, when adding coagulants to wastewater, the coagulants are directly added to the wastewater all at once in the same location in the wastewater treatment container, which results in the coagulants not being able to mix with the wastewater quickly and thoroughly. Utility Model Content
[0005] The purpose of this invention is to provide a mercury removal device based on wastewater treatment to solve the problems mentioned in the background art.
[0006] The objective of this utility model can be achieved through the following technical solutions:
[0007] A mercury removal device based on wastewater treatment includes a treatment tank for treating mercury-containing wastewater. A premixing mechanism is fixedly connected to the top of the inner wall of the treatment tank. The premixing mechanism is used to mix water and coagulant. The premixing mechanism includes a premixing chamber and a diversion chamber. The premixing chamber is fixed to the bottom of the inner wall of the treatment tank, and the diversion chamber is fixed to the bottom of the premixing chamber. The bottom of the diversion chamber is provided with diversion holes arranged in a ring array.
[0008] A connecting pipe is fixedly connected between the premixing chamber and the diversion chamber. A first solenoid valve is installed on the connecting pipe. A rotatable stirring rod is installed inside the processing tank. A first stirring shaft is fixedly connected to the outer surface of the stirring rod inside the premixing chamber. A second stirring shaft is fixedly installed on the outer surface of the stirring rod inside the processing tank.
[0009] Preferably, a drive motor is fixedly installed on the top of the processing tank, and the top of the stirring rod passes through the premixing chamber and the top of the processing tank and is fixedly connected to the output end of the drive motor.
[0010] Preferably, O-rings are installed on the top of both the premixing chamber and the processing tank. The O-rings are fitted onto the outer surface of the stirring rod to achieve a rotary seal between the stirring rod and the premixing chamber and the processing tank.
[0011] Preferably, a wastewater inlet pipe and a wastewater outlet pipe are installed on one side of the treatment tank, and a second solenoid valve is installed on the wastewater outlet pipe.
[0012] Preferably, a clean water input pipe is installed on one side of the treatment tank, one end of which extends into the interior of the premixing chamber, and a third solenoid valve is installed on the clean water input pipe.
[0013] Preferably, a coagulant storage silo is fixedly connected to the top of the treatment tank, a coagulant input pipe is fixedly connected to the bottom of the coagulant storage silo, the bottom of the coagulant input pipe is connected to the premixing silo, and a fourth solenoid valve is installed on the coagulant input pipe.
[0014] The beneficial effects of this utility model are:
[0015] This invention uses a drive motor to simultaneously rotate a first stirring shaft and a second stirring shaft. The first stirring shaft premixes the coagulant and water inside the premixing chamber and then releases them into the distribution chamber. The mixture is then evenly dispersed into the treatment tank through the distribution holes at the bottom of the distribution chamber. The second stirring shaft mixes the wastewater and the premixed coagulant. When removing mercury from the wastewater, this allows the coagulant to mix with the wastewater more quickly and thoroughly. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a utility model Figure 1 Schematic diagram of the structure of the medium coagulant storage silo;
[0019] Figure 3 This is a utility model Figure 1 A structural diagram of the premixing and distribution warehouse sections;
[0020] Figure 4 This is a utility model Figure 3 A schematic diagram of the structure at the bottom of the central diversion chamber.
[0021] The attached figures are labeled as follows:
[0022] 1. Treatment tank; 101. Wastewater inlet pipe; 102. Wastewater outlet pipe; 103. Second solenoid valve; 2. Premixing tank; 3. Diversion tank; 301. Diversion orifice; 4. Connecting pipe; 401. First solenoid valve; 5. Stirring rod; 6. First stirring shaft; 7. Second stirring shaft; 8. Drive motor; 9. O-ring; 10. Clean water inlet pipe; 11. Third solenoid valve; 12. Coagulant storage tank; 13. Coagulant inlet pipe; 14. Fourth solenoid valve. Detailed Implementation
[0023] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0024] like Figure 1 , Figure 3 and Figure 4 A mercury removal device based on wastewater treatment includes a treatment tank 1 for treating mercury-containing wastewater. A premixing mechanism is fixedly connected to the top of the inner wall of the treatment tank 1. The premixing mechanism is used to mix water and coagulant. The premixing mechanism includes a premixing chamber 2 and a diversion chamber 3. The centers of the premixing chamber 2 and the diversion chamber 3 are aligned in the vertical direction, and both the premixing chamber 2 and the diversion chamber 3 form cavities inside. The premixing chamber 2 is fixed to the bottom of the inner wall of the treatment tank 1, and the diversion chamber 3 is fixed to the bottom of the premixing chamber 2. The bottom of the diversion chamber 3 is provided with diversion holes 301 arranged in a ring array.
[0025] like Figure 1 , Figure 3 and Figure 4 A connecting pipe 4 is fixedly connected between the premixing chamber 2 and the diversion chamber 3, so that water inside the premixing chamber 2 can be input into the diversion chamber 3 through the connecting pipe 4. A first solenoid valve 401 is installed on the connecting pipe 4. A rotatable stirring rod 5 is provided inside the treatment tank 1. A first stirring shaft 6 is fixedly connected to the outer surface of the stirring rod 5 and located inside the premixing chamber 2. A second stirring shaft 7 is fixedly installed on the outer surface of the stirring rod 5 and located inside the treatment tank 1. The length of the second stirring shaft 7 exceeds the length of the first stirring shaft 6.
[0026] like Figure 1 , Figure 3 and Figure 4 A drive motor 8 is fixedly installed on the top of the processing tank 1. The drive motor 8 is connected to an external power supply and has a corresponding control switch. The top of the stirring rod 5 passes through the top of the premixing chamber 2 and the processing tank 1 and is fixedly connected to the output end of the drive motor 8, so that the drive motor 8 can drive the stirring rod 5 to rotate.
[0027] like Figure 1 , Figure 3 and Figure 4 Both the premixing chamber 2 and the processing tank 1 are equipped with O-rings 9 on their tops. The O-rings 9 are fitted onto the outer surface of the stirring rod 5. The O-rings 9 serve as dynamic seals to achieve rotational sealing between the stirring rod 5 and the premixing chamber 2 and the processing tank 1. Even if the O-rings 9 wear and cause a small amount of leakage, it will not affect the normal use of the equipment.
[0028] like Figure 1 The treatment tank 1 is equipped with a wastewater inlet pipe 101 and a wastewater outlet pipe 102 on one side. A second solenoid valve 103 is installed on the wastewater outlet pipe 102. Both the wastewater inlet pipe 101 and the wastewater outlet pipe 102 are connected to external pipelines, so that the wastewater to be demercured can be input into the treatment tank 1 through the wastewater inlet pipe 101. After coagulation is completed inside the treatment tank 1, it is output to the next wastewater treatment stage through the wastewater outlet pipe 102. The entire wastewater treatment process is as follows:
[0029] 1. Preprocessing stage:
[0030] pH adjustment: Add sodium hydroxide or dilute sulfuric acid to adjust the pH of the wastewater to a slightly alkaline range of 6-9 to ensure optimal reaction conditions for subsequent coagulants. If the original water pH is 5, NaOH solution needs to be added to adjust it to pH 7.5-8.5.
[0031] 2. Core process of coagulation and sedimentation:
[0032] For coagulant addition, polyaluminum chloride (PAC) or ferrous sulfate (FeSO4) is selected as the coagulant, with a dosage of 50-200 mg / L. The coagulant and wastewater are mixed using the treatment tank 1 of this application to ensure uniform dispersion of the coagulant. For example, for wastewater with a mercury concentration of 10 mg / L, 100 mg / L of PAC is added, and rapid stirring is used to form micro-flocculations.
[0033] The flocculation reaction occurs when the material enters the flocculation tank and is stirred slowly (20-40 rpm) for 15-30 minutes to promote the adsorption of mercury ions by the flocs and gradually increase their size to millimeter-sized particles.
[0034] Solid-liquid separation is achieved by separating flocs from water through gravity sedimentation (horizontal flow sedimentation tank) or centrifugal separation equipment (such as horizontal screw centrifuge). The sedimentation time needs to be ≥1 hour, and the centrifuge speed should be controlled at 3000-5000 rpm.
[0035] 3. Deep processing enhancement:
[0036] Sulfide precipitation assistance (optional): If the mercury concentration in the effluent does not meet the standard (e.g., >0.05mg / L), add 5-20mg / L of sodium sulfide (Na2S) to generate HgS precipitate under pH 8-9 conditions, further reducing the mercury concentration to below 0.01mg / L.
[0037] Activated carbon adsorption (fine treatment) involves setting up activated carbon filter tanks or filter columns, using granular activated carbon with a particle size of 1-3mm, and a filtration rate of 8-12m / h to adsorb residual dissolved mercury or organic mercury, so that the mercury concentration in the effluent is ≤0.001mg / L.
[0038] 4. Sludge treatment and mercury recovery:
[0039] Sludge dewatering: The settled sludge is dewatered using a plate and frame filter press or belt press, reducing the moisture content to below 60% to form sludge cake. Mercury resource recovery: Mercury-containing sludge is recovered through high-temperature roasting (600-800℃) or acid leaching. The roasting exhaust gas must be treated by activated carbon adsorption to avoid secondary pollution.
[0040] like Figure 1 A clean water input pipe 10 is installed on one side of the treatment tank 1. One end of the clean water input pipe 10 extends into the interior of the premixing chamber 2, and a third solenoid valve 11 is installed on the clean water input pipe 10. The clean water input pipe 10 is connected to an external pipe, so that the external pipe can input clean water into the interior of the premixing chamber 2.
[0041] like Figure 1 and Figure 2 The top of the treatment tank 1 is fixedly connected to a coagulant storage chamber 12. The top of the coagulant storage chamber 12 has an openable cover plate, and the bottom of the inner wall is sloped to facilitate the flow of coagulant into the coagulant inlet pipe 13. The bottom of the coagulant storage chamber 12 is fixedly connected to a coagulant inlet pipe 13. The bottom of the coagulant inlet pipe 13 is connected to the premixing chamber 2, which can input the coagulant into the interior of the premixing chamber 2. A fourth solenoid valve 14 is installed on the coagulant inlet pipe 13.
[0042] All solenoid valves used in this application are existing technologies, externally powered, and capable of controlling fluid flow.
[0043] The working principle of the mercury removal device based on wastewater treatment provided by this utility model is as follows:
[0044] First, clean water and coagulant are released into the premixing chamber 2. Wastewater is injected into the treatment tank 1 through the wastewater inlet pipe 101. Then, the drive motor 8 is started, and the first stirring shaft 6 and the second stirring shaft 7 are rotated through the stirring rod 5.
[0045] After the first stirring shaft 6 rotates to mix the coagulant and water inside the premixing chamber 2, the first solenoid valve 401 opens, and the premixed water and coagulant enter the diversion chamber 3. They are then evenly dispersed into the mercury-containing wastewater inside the treatment tank 1 through the diversion hole 301, and are quickly and thoroughly mixed with the wastewater under the stirring of the second stirring shaft 7.
[0046] Compared with related technologies, the mercury removal device based on wastewater treatment provided by this utility model has the following beneficial effects:
[0047] This invention uses a drive motor 8 to simultaneously rotate the first stirring shaft 6 and the second stirring shaft 7. The first stirring shaft 6 premixes the coagulant and water inside the premixing chamber 2 and then releases them into the diversion chamber 3. The mixture is then evenly dispersed into the treatment tank 1 through the diversion hole 301 at the bottom of the diversion chamber 3. The second stirring shaft 7 mixes the wastewater and the premixed coagulant. When removing mercury from the wastewater, this allows the coagulant to mix with the wastewater more quickly and thoroughly.
[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. A mercury removal device based on wastewater treatment, comprising a treatment tank (1) for treating mercury-containing wastewater, characterized in that, The top of the inner wall of the treatment tank (1) is fixedly connected to a premixing mechanism. The premixing mechanism is used to mix water and coagulant. The premixing mechanism includes a premixing chamber (2) and a diversion chamber (3). The premixing chamber (2) is fixed to the bottom of the inner wall of the treatment tank (1), and the diversion chamber (3) is fixed to the bottom of the premixing chamber (2). The bottom of the diversion chamber (3) is provided with diversion holes (301) arranged in a ring array. A connecting pipe (4) is fixedly connected between the premixing chamber (2) and the diversion chamber (3). A first solenoid valve (401) is installed on the connecting pipe (4). A rotatable stirring rod (5) is provided inside the processing tank (1). A first stirring shaft (6) is fixedly connected to the outer surface of the stirring rod (5) and inside the premixing chamber (2). A second stirring shaft (7) is fixedly installed on the outer surface of the stirring rod (5) and inside the processing tank (1).
2. The mercury removal device based on wastewater treatment according to claim 1, characterized in that, A drive motor (8) is fixedly installed on the top of the processing tank (1), and the top of the stirring rod (5) passes through the top of the premixing chamber (2) and the processing tank (1) and is fixedly connected to the output end of the drive motor (8).
3. The mercury removal device based on wastewater treatment according to claim 2, characterized in that, Both the premixing chamber (2) and the processing tank (1) are equipped with O-rings (9) on their tops. The O-rings (9) are fitted onto the outer surface of the stirring rod (5) to achieve a rotary seal between the stirring rod (5) and the premixing chamber (2) and the processing tank (1).
4. The mercury removal device based on wastewater treatment according to claim 1, characterized in that, Wastewater inlet pipe (101) and wastewater outlet pipe (102) are installed on one side of the treatment tank (1), and a second solenoid valve (103) is installed on the wastewater outlet pipe (102).
5. A mercury removal device based on wastewater treatment according to claim 1, characterized in that, A clean water inlet pipe (10) is installed on one side of the treatment tank (1), one end of which extends into the interior of the premixing chamber (2), and a third solenoid valve (11) is installed on the clean water inlet pipe (10).
6. The mercury removal device based on wastewater treatment according to claim 1, characterized in that, The top of the treatment tank (1) is fixedly connected to a coagulant storage silo (12), and the bottom of the coagulant storage silo (12) is fixedly connected to a coagulant input pipe (13). The bottom of the coagulant input pipe (13) is connected to the premixing silo (2), and a fourth solenoid valve (14) is installed on the coagulant input pipe (13).