Wastewater treatment system

Abstract

The wastewater treatment system comprises a preparation device and a reaction device, the preparation device comprises a preparation tank, a ton bag and a control module, the preparation tank is provided with a feeding pipe and a water inlet pipe, the water inlet pipe is provided with an electric water inlet valve, the ton bag is arranged on the upper side of the preparation tank, the ton bag is connected with the feeding pipe, the feeding pipe is provided with an electric feeding valve, and the control module is connected with the electric feeding valve. The control module comprises a liquid level detection device, a weight detection device and a controller, the liquid level detection device is arranged in the preparation tank, the weight detection device is connected with the ton bag to detect the weight of the ton bag, and the liquid level detection device, the electric water inlet valve, the weight detection device and the electric feeding valve are all in signal connection with the controller; the reaction device comprises a reaction tank, the reaction tank is provided with a lime milk inlet and a wastewater port, and the lime milk inlet is connected with the preparation tank. The preparation device of the wastewater treatment system disclosed by the embodiment of the utility model can be used for preparing lime emulsion in an accurate proportion, so that the lime consumption is saved while the reaction efficiency of fluorine-containing wastewater is ensured, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of wastewater treatment, and specifically to a wastewater treatment system. Background Technology

[0002] For high-concentration fluoride-containing industrial wastewater, calcium salt precipitation is generally used for treatment. This involves adding a pre-concentrated lime slurry to the wastewater, causing fluoride ions to react with calcium ions to form CaF2 precipitate, which is then removed. Currently, the lime slurry is prepared using an underground tank with air mixing. However, due to inaccurate concentration preparation, there are instances of repeated preparation or excessive lime usage during the fluoride-containing wastewater treatment process, resulting in waste. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose a wastewater treatment system, whose preparation device can prepare a precise ratio of lime slurry, which saves lime usage and reduces production costs while ensuring the reaction efficiency of fluoride-containing wastewater.

[0005] The wastewater treatment system of this utility model embodiment includes a preparation device and a reaction device. The preparation device includes a preparation tank, a ton bag, and a control module. The preparation tank is equipped with a feeding pipe and a water inlet pipe. The water inlet pipe is equipped with an electric water inlet valve. The ton bag is located on the upper side of the preparation tank and is connected to the feeding pipe. The feeding pipe is equipped with an electric feeding valve. The control module includes a liquid level detection device, a weight detection device, and a controller. The liquid level detection device is located inside the preparation tank. The weight detection device is connected to the ton bag to detect the weight of the ton bag. The liquid level detection device, the electric water inlet valve, the weight detection device, and the electric feeding valve are all signal-connected to the controller. The reaction device includes a reaction tank with a lime slurry inlet and a wastewater outlet for wastewater inflow. The lime slurry inlet is connected to the preparation tank.

[0006] In some embodiments, the preparation tank is equipped with a concentration detection device, which is signal-connected to the controller.

[0007] In some embodiments, the dispensing apparatus further includes a hoisting assembly comprising a cable tray and a trolley, the trolley being movable relative to the cable tray, and the ton bag being connected to the trolley.

[0008] In some embodiments, the ton bag has an outlet end connected to the feeding pipe, and a dust removal device is provided at the end of the feeding pipe away from the preparation tank. The dust removal device includes a sealed feeding bin, and at least a portion of the outlet end and the feeding pipe are located inside the sealed feeding bin.

[0009] In some embodiments, the preparation apparatus further includes a first stirring paddle rotatably connected to the preparation tank.

[0010] In some embodiments, the number of preparation tanks is multiple.

[0011] In some embodiments, the wastewater treatment system further includes a pump body, the preparation tank having a lime slurry outlet, the inlet of the pump body being connected to the lime slurry outlet, and the outlet of the pump body being connected to the lime slurry inlet.

[0012] In some embodiments, the reaction apparatus further includes a second stirring paddle, and the reaction vessel includes a vessel body and a cover connected to each other, the second stirring paddle being rotatably connected to the cover.

[0013] In some embodiments, the second stirring paddle includes a shaft and blades, the shaft being rotatably connected to the cover, and the blades being welded to the shaft.

[0014] In some embodiments, the cover is provided with a lifting ring.

[0015] The wastewater treatment system of this utility model embodiment is suitable for treating R22 fluoride-containing wastewater. The preparation device can prepare a lime slurry in a precise ratio. The lime slurry with a precise ratio prepared by the preparation device enters the reaction tank. The fluoride-containing wastewater also enters the reaction tank through the wastewater outlet. The fluoride-containing wastewater and the lime slurry undergo an acid-base reaction in the reaction tank to generate CaF2, thereby removing fluoride ions from the wastewater. Because the lime slurry is precisely proportioned, the lime consumption can be saved while ensuring the reaction efficiency of the fluoride-containing wastewater, thus reducing production costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the preparation device of a wastewater treatment system according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the reaction device of a wastewater treatment system according to an embodiment of the present invention.

[0018] Figure label:

[0019] 10. Preparation device; 11. Preparation tank; 111. Feeding pipe; 112. Water inlet pipe; 113. Electric water inlet valve; 114. Electric feeding valve; 115. Lime slurry outlet; 12. Ton bag; 121. Outlet end; 122. Lifting strap; 131. Liquid level detection device; 132. Weight detection device; 133. Concentration detection device; 14. Lifting assembly; 141. Cable tray; 142. Trolley; 1421. Lifting rope; 15. Sealed feeding hopper; 16. First stirring paddle; 161. First motor;

[0020] 20. Reaction apparatus; 21. Reaction tank; 211. Lime slurry inlet; 212. Wastewater outlet; 213. Tank body; 214. Cover; 2141. Lifting ring; 22. Second agitator; 221. Shaft; 222. Blade; 23. Second motor;

[0021] 3. Pump body; 31. First pipe section; 32. Discharge valve; 33. Second pipe section. Detailed Implementation

[0022] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] like Figure 1 and Figure 2 As shown, the wastewater treatment system of this utility model embodiment includes a preparation device 10 and a reaction device 20. The preparation device 10 includes a preparation tank 11, a ton bag 12, and a control module. The preparation tank 11 is provided with a feeding pipe 111 and a water inlet pipe 112. The water inlet pipe 112 is provided with an electric water inlet valve 113. The ton bag 12 is located on the upper side of the preparation tank 11 and is connected to the feeding pipe 111. The feeding pipe 111 is provided with an electric feeding valve 114. The control module includes a liquid level detection device 131 and a weight detection device 14. The apparatus includes a liquid level detection device 131 located inside the preparation tank 11, and a weight detection device 132 connected to the ton bag 12 to detect the weight of the ton bag 12. The liquid level detection device 131, the electric water inlet valve 113, the weight detection device 132, and the electric feeding valve 114 are all connected to the controller via signals. The reaction apparatus 20 includes a reaction tank 21, which has a lime slurry inlet 211 and a wastewater inlet 212 for wastewater inflow. The lime slurry inlet 211 is connected to the preparation tank 11.

[0024] The wastewater treatment system of this utility model embodiment is suitable for treating R22 fluoride-containing wastewater. The preparation device 10 can prepare a lime slurry in a precise ratio. The lime slurry with a precise ratio prepared by the preparation device 10 enters the reaction tank 21. The fluoride-containing wastewater also enters the reaction tank 21 through the wastewater outlet 212. The fluoride-containing wastewater and the lime slurry undergo an acid-base reaction in the reaction tank 21 to generate CaF2, thereby removing fluoride ions from the wastewater. Because the lime slurry is precisely proportioned, the reaction efficiency of the fluoride-containing wastewater can be guaranteed while saving lime usage and reducing production costs.

[0025] Specifically, the liquid level detection device 131 and the electric water inlet valve 113 are both connected to the controller signal. The liquid level detection device 131 can detect the water level in the preparation tank 11 in real time and transmit the water level signal to the controller. When the water level in the preparation tank 11 reaches the preset water level, the controller controls the electric water inlet valve 113 to close, which can control the amount of water in the preparation tank 11.

[0026] The weight detection device 132 and the electric feeding valve 114 are both connected to the controller signal. The lime powder is stored in the ton bag 12. The weight detection device 132 can detect the weight of the ton bag 12 in real time and transmit the weight signal to the controller. The controller can obtain the weight of the lime powder put into the mixing tank 11 by the weight difference of the ton bag 12. When the weight of the lime powder put into the mixing tank 11 by the ton bag 12 reaches the preset weight, the controller controls the electric feeding valve 114 to close, which can control the amount of lime powder in the mixing tank 11.

[0027] Therefore, by setting the ratio of lime powder to water in the controller, injecting water to a preset level into the preparation tank 11, and simultaneously adding a preset weight of lime powder, the accurate ratio of lime slurry can be ensured. This reduces the amount of lime used while maintaining the defluorination efficiency, thereby lowering the cost of wastewater treatment.

[0028] Optionally, the controller is a PLC controller.

[0029] Optionally, the weight detection device 132 is a weighing sensor.

[0030] Optionally, the liquid level detection device 131 is a liquid level gauge.

[0031] As an example, such as Figure 1 As shown, the level gauge is vertically installed on the top wall of the preparation tank 11.

[0032] In some embodiments, such as Figure 1 As shown, the preparation tank 11 is equipped with a concentration detection device 133, which is connected to the controller signal.

[0033] The concentration of lime slurry in the preparation tank 11 can be detected by the concentration detection device 133, and the concentration signal is transmitted to the controller. The controller can compare the received concentration signal with the preset concentration. When the difference between the two exceeds a certain range, the controller controls the electric feeding valve 114 or the electric water inlet valve 113 to open, thereby adjusting the concentration of lime slurry in the preparation tank 11 and further improving the proportioning accuracy of lime slurry.

[0034] Optionally, the concentration detection device 133 is a concentration meter.

[0035] As an example, such as Figure 1 As shown, the concentration meter is installed on the side of the preparation tank 11.

[0036] In some embodiments, such as Figure 1 As shown, the preparation device 10 also includes a hoisting assembly 14, which includes a bridge 141 and a trolley 142. The trolley 142 is movable relative to the bridge 141, and the ton bag 12 is connected to the trolley 142.

[0037] After all the lime powder in the ton bag 12 has been added, the empty ton bag is moved out of the upper side of the mixing tank 11 by the trolley 142 and replaced. Then, the ton bag containing lime powder is transported to the upper side of the mixing tank 11 by the trolley 142 and connected to the feeding pipe 111. This allows for the replacement of the ton bag 12, making the operation very convenient.

[0038] like Figure 1 As shown, the trolley 142 includes a trolley body and a lifting rope 1421. The trolley body can move along the bridge frame 141. The ton bag 12 has a lifting strap 122. The lifting rope 1421 is connected to the lifting strap 122 for hoisting. The ton bag 12 can be lifted and lowered by the lifting rope 1421. The trolley 142 can move horizontally by moving, thereby enabling the replacement of the ton bag 12.

[0039] In some embodiments, the ton bag 12 has an outlet end 121 connected to a feeding pipe 111. The end of the feeding pipe 111 away from the preparation tank 11 is provided with a dust removal device. The dust removal device includes a sealed feeding bin 15. At least a portion of the feeding pipe 111 and the outlet end 121 are located inside the sealed feeding bin 15.

[0040] The sealed feeding hopper 15 can enclose the connection between the feeding pipe 111 and the ton bag 12, and the lime dust generated during the feeding process can be removed by the dust removal device, thereby preventing the lime dust from escaping into the external environment and ensuring the safety of the operating environment.

[0041] Specifically, the sealed feeding hopper 15 is connected to the top wall of the preparation tank 11 and covers the feeding pipe 111. The feeding pipe 111 extends vertically, with its lower end connected to the preparation tank 11 and its upper end extending to the middle of the sealed feeding hopper 15. The size of the outlet end 121 of the ton bag 12 matches the size of the feeding pipe 111. The upper side of the interior of the sealed feeding hopper 15 is provided with a fixing structure for fixing the outlet end 121 of the ton bag 12. Connecting the outlet end 121 of the ton bag 12 to the feeding pipe 111 allows the connection point of the two to be located inside the sealed feeding hopper 15. Thus, lime dust that escapes during the process of adding lime powder from the ton bag 12 to the preparation tank 11 enters the sealed feeding hopper 15, and the sealed feeding hopper 15 can prevent lime dust from escaping into the external environment.

[0042] In addition, the sealed feeding hopper 15 can be designed as a detachable structure to facilitate the replacement of the ton bag 12.

[0043] The dust removal device is a negative pressure dust removal device. The dust removal device also includes an exhaust fan and a filter (not shown in the figure). The inlet of the exhaust fan is connected to the sealed feeding hopper 15. The exhaust fan creates a negative pressure in the sealed feeding hopper 15, so that the lime dust in the sealed feeding hopper 15 is drawn away and filtered through the filter, thereby realizing the dust removal work.

[0044] In some embodiments, such as Figure 1 As shown, the preparation device 10 also includes a first stirring paddle 16, which is rotatably connected to the preparation tank 11.

[0045] By setting up a stirring paddle, the lime powder and water are fully and evenly mixed, thereby accelerating the preparation efficiency of lime slurry.

[0046] Specifically, a first motor 161 is provided on the upper side of the top wall of the preparation tank 11. The output shaft of the first motor 161 passes through the top wall of the preparation tank 11 and is connected to the shaft 221 of the first stirring paddle 16. The first motor 161 can drive the first stirring paddle 16 to rotate automatically, thereby realizing the stirring of lime slurry.

[0047] In some embodiments, the number of preparation tanks 11 is multiple.

[0048] By setting up multiple preparation tanks 11, the prepared lime slurry can be supplied alternately, ensuring a continuous supply of lime slurry and thus improving the treatment efficiency of fluoride-containing wastewater.

[0049] As an example, such as Figure 1 As shown, there are two preparation tanks 11. The ton bag 12, water inlet pipe 112, first stirring paddle 16, liquid level detection device 131 and weight detection device 132 are all corresponding to the preparation tanks 11. Furthermore, the water inlet pipes 112 of the two preparation tanks 11 are supplied with water through a main water pipe.

[0050] In some embodiments, such as Figure 1 and Figure 2 As shown, the wastewater treatment system also includes a pump body 3, a mixing tank 11 with a lime slurry outlet 115, an inlet of the pump body 3 connected to the lime slurry outlet 115, and an outlet of the pump body 3 connected to the lime slurry inlet 211.

[0051] With the above settings, pump 3 can provide power to the lime slurry, transporting the lime slurry in preparation tank 11 to reaction tank 21, thereby achieving the treatment of fluoride-containing wastewater.

[0052] like Figure 1 and Figure 2As shown, the lime slurry outlet 115 is located near the bottom of the preparation tank 11. The lime slurry outlet 115 is connected to a first pipe section 31. There are two preparation tanks 11. The first pipe sections 31 of the two preparation tanks 11 are combined into one pipe and then connected to the inlet of the pump body 3. A discharge valve 32 is provided on the first pipe section 31. The discharge valve 32 is an electric valve and is connected to the PLC controller. The PLC controller can control the two preparation tanks 11 to alternately supply lime slurry to the reaction tank 21, ensuring that the reaction tank 21 works continuously and improving the reaction efficiency.

[0053] The lime slurry inlet 211 is installed through the top wall of the reaction tank 21. The outlet of the pump body 3 is connected to the second pipe section 33, which is connected to the lime slurry inlet 211. Starting the pump body 3 can transport the lime slurry in the preparation tank 11 to the reaction tank 21.

[0054] Of course, in other embodiments, the pump body 3 may not be provided. Instead, a height difference is set between the preparation tank 11 and the reaction tank 21, so that the lime slurry in the preparation tank 11 enters the reaction tank 21 under the action of gravity.

[0055] In some embodiments, such as Figure 2 As shown, the reaction apparatus 20 also includes a second stirring paddle 22, and the reaction vessel 21 includes a vessel body 213 and a cover 214 connected to each other. The second stirring paddle 22 is rotatably connected to the cover 214.

[0056] In some embodiments, such as Figure 2 As shown, the second stirring paddle 22 includes a shaft 221 and a blade 222. The shaft 221 is rotatably connected to the cover 214, and the blade 222 is welded to the shaft 221.

[0057] In related technologies, the shaft 221 of the second stirring paddle 22 is usually rotatably connected to the bottom wall of the reaction tank 21, and the blade 222 is connected to the shaft 221 by bolts. During long-term acid-base reaction, the connecting bolts between the blade 222 and the shaft 221 will corrode, causing the blade 222 to fall off frequently. Maintenance personnel need to enter the reaction tank 21 through the manhole for maintenance, which is troublesome and seriously affects the treatment efficiency of fluoride-containing wastewater.

[0058] In this embodiment of the invention, the second stirring paddle 22 is connected to the cover 214 of the induction tube. The second stirring paddle 22 can be lifted out of the tank 213 as a whole along with the cover 214, making maintenance of the second stirring paddle 22 relatively simple. Furthermore, compared to the bolted connection method used in related technologies, welding the paddle 222 and the shaft 221 together makes the connection more stable, significantly reducing the probability of the paddle 222 falling off, thereby reducing the maintenance frequency of the reaction device 20 and ensuring its normal operation.

[0059] Specifically, such as Figure 2 As shown, a second motor 23 is connected to the upper side of the cover 214. The output shaft of the second motor 23 passes through the cover 214 and is connected to the shaft 221 of the second stirring paddle 22. The second motor 23 can drive the second stirring paddle 22 to rotate, thereby improving the reaction efficiency of the fluoride-containing wastewater.

[0060] Optionally, the blades 222 of the second stirring paddle 22 are multi-layer turbine blades.

[0061] In some embodiments, the cover 214 is provided with a hanging ring 2141.

[0062] This makes it easier to hoist the cover 214 and the second stirring paddle 22 as a whole.

[0063] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0066] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0067] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0068] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A wastewater treatment system, characterized in that, include: A preparation device (10) includes a preparation tank (11), a ton bag (12), and a control module. The preparation tank (11) is equipped with a feeding pipe (111) and a water inlet pipe (112). The water inlet pipe (112) is equipped with an electric water inlet valve (113). The ton bag (12) is located on the upper side of the preparation tank (11) and is connected to the feeding pipe (111). The feeding pipe (111) is equipped with an electric feeding valve (114). The control module includes a liquid level detection device (131), a weight detection device (132), and a controller. The liquid level detection device (131) is located inside the preparation tank (11). The weight detection device (132) is connected to the ton bag (12) to detect the weight of the ton bag (12). The liquid level detection device (131), the electric water inlet valve (113), the weight detection device (132), and the electric feeding valve (114) are all connected to the controller via signals. The reaction apparatus (20) includes a reaction tank (21) having a lime slurry inlet (211) and a wastewater inlet (212) for wastewater to enter. The lime slurry inlet (211) is connected to the preparation tank (11).

2. The wastewater treatment system according to claim 1, characterized in that, The preparation tank (11) is equipped with a concentration detection device (133), which is connected to the controller.

3. The wastewater treatment system according to claim 1, characterized in that, The preparation device (10) further includes a hoisting assembly (14), which includes a bridge (141) and a trolley (142), the trolley (142) being movable relative to the bridge (141), and the ton bag (12) being connected to the trolley (142).

4. The wastewater treatment system according to claim 1, characterized in that, The ton bag (12) has an outlet end (121) connected to the feeding pipe (111). The feeding pipe (111) is provided with a dust removal device at one end away from the preparation tank (11). The dust removal device includes a sealed feeding bin (15). At least a portion of the outlet end (121) and the feeding pipe (111) are located inside the sealed feeding bin (15).

5. The wastewater treatment system according to claim 1, characterized in that, The preparation device (10) further includes a first stirring paddle (16), which is rotatably connected to the preparation tank (11).

6. The wastewater treatment system according to claim 1, characterized in that, The number of preparation tanks (11) is multiple.

7. The wastewater treatment system according to any one of claims 1-6, characterized in that, It also includes a pump body (3), the preparation tank (11) has a lime milk outlet (115), the inlet of the pump body (3) is connected to the lime milk outlet (115), and the outlet of the pump body (3) is connected to the lime milk inlet (211).

8. The wastewater treatment system according to any one of claims 1-6, characterized in that, The reaction apparatus (20) further includes a second stirring paddle (22), and the reaction vessel (21) includes a vessel body (213) and a cover (214) connected to each other, wherein the second stirring paddle (22) is rotatably connected to the cover (214).

9. The wastewater treatment system according to claim 8, characterized in that, The second stirring paddle (22) includes a shaft (221) and blades (222), the shaft (221) being rotatably connected to the cover (214), and the blades (222) being welded to the shaft (221).

10. The wastewater treatment system according to claim 8, characterized in that, The cover (214) is provided with a lifting ring (2141).

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