Wastewater treatment device based on magnetic adsorbent

Abstract

The utility model discloses a wastewater treatment device based on a magnetic adsorbent, and aims to solve the problems that the existing electroplating wastewater treatment difficulty is high and the magnetic adsorbent is difficult to recover. According to the wastewater treatment device based on the magnetic adsorbent, a tank body of an adsorption reaction tank is cylindrical, a water decanter is arranged in the adsorption reaction tank, a first electromagnet device is arranged at the lower part of the cylindrical tank body of the adsorption reaction tank, and a second electromagnet device is arranged at the inverted conical tank bottom of the adsorption reaction tank; a first water outlet of the raw water tank is communicated with the adsorption reaction tank through a first water pipe, one end of a second water pipe is communicated with a second water outlet of the raw water tank, the other end of the second water pipe is communicated with a water inlet of the adsorption reaction tank, and a water injector is arranged on the second water pipe. Based on the magnetic separation characteristic of the magnetic composite adsorbent, the adsorption-magnetic separation reactor is designed, heavy metal wastewater is effectively treated, and meanwhile efficient separation and concentration of the magnetic biological adsorbent can be achieved through the electromagnet.

Description

Technical Field

[0001] This utility model relates to a device for treating electroplating wastewater. Background Technology

[0002] Chromium plating wastewater contains a large amount of toxic and harmful substances such as heavy metal ions, making it a particularly typical type of industrial wastewater that is difficult to biodegrade. Currently, electroplating wastewater is characterized by large treatment volumes, complex and variable compositions (different electroplating processes and materials greatly influence the composition of the wastewater), and poor biodegradability. Therefore, research on electroplating wastewater treatment processes has become especially important.

[0003] Electroplating wastewater has poor biodegradability, and the presence of heavy metals, cyanides, and other toxic and harmful substances, as well as salts, further exacerbates its non-biodegradability. Common methods for treating electroplating wastewater include physical and chemical methods. Physical methods include adsorption, membrane separation, and magnetic separation. Physical methods can reduce the salt and metal ion content of electroplating wastewater, thereby effectively improving its biodegradability.

[0004] Currently, the actual electroplating wastewater treatment process in the park is as follows: After the chromium plating wastewater enters the equalization tank, it is treated by adding chemical agents through reduction and precipitation. After the sedimentation is relatively complete, due to the limitation of the solubility product constant, the heavy metal chromium cannot meet the discharge standards. Therefore, reverse osmosis membranes are then used for further treatment to ensure that the effluent meets the standards. The chemical reduction precipitation and reverse osmosis processes generate a large amount of sludge and membrane concentrate, which are treated periodically as hazardous waste. However, the sludge and membrane concentrate are not easy to collect, and the treatment cost of this process is relatively high. Utility Model Content

[0005] The purpose of this invention is to solve the problems of high difficulty in treating electroplating wastewater and difficulty in recovering magnetic adsorbents, and to provide a wastewater treatment device based on magnetic adsorbents.

[0006] This utility model relates to a wastewater treatment device based on magnetic adsorbents, comprising a raw water tank, an adsorption reaction tank, two electromagnets, an adsorbent storage tank, a decanter, and a filter press. The adsorption reaction tank is cylindrical with an inverted conical bottom. The decanter is located inside the adsorption reaction tank and has an outlet pipe. A first electromagnet is located at the bottom of the cylindrical adsorption reaction tank, and a second electromagnet is located at the inverted conical bottom of the adsorption reaction tank. A sludge discharge port is also provided on the inverted conical bottom of the adsorption reaction tank. One end of the sludge discharge pipe is connected to the sludge discharge port, and the other end of the sludge discharge pipe is connected to the inlet of the filter press. The outlet of the filter press is connected to the return port of the raw water tank via a return pipe.

[0007] The No. 1 outlet of the raw water tank is connected to the inlet of the adsorption reaction tank through the first water pipe. One end of the second water pipe is connected to the No. 2 outlet of the raw water tank, and the other end of the second water pipe is connected to the inlet of the adsorption reaction tank. A water jet is installed on the second water pipe, and the lower part of the water jet is connected to the adsorbent storage tank, which contains magnetic adsorbent.

[0008] This utility model relates to a wastewater treatment device based on magnetic adsorbents, which mainly includes a raw water tank, an adsorption reaction tank, two electromagnet devices, an adsorbent storage tank, and a filter press. Chromium plating wastewater from the raw water tank is fed into the adsorption reaction tank. The adsorbent storage tank contains magnetic adsorbent, which is drawn into the water jet by negative pressure generated by a water jet injector and mixed with the chromium plating wastewater before entering the adsorption reaction tank. Considering the adsorption characteristics and magnetic separation capabilities of the magnetic composite adsorbent, a first electromagnet device is installed on the cylindrical body of the adsorption reaction tank for recovering the magnetic adsorbent from the reaction system. A second electromagnet device is installed on the inverted conical bottom of the adsorption reaction tank for continuously compressing and discharging the bio-adsorbent sludge. The discharged high-concentration sludge enters the filter press, the filtered water flows back into the raw water tank, and the sludge cake obtained from the filter press is sent to an incinerator.

[0009] Based on the magnetic separation characteristics of magnetic composite adsorbents, this invention designs an adsorption-magnetic separation reactor, which can effectively treat heavy metal wastewater while achieving efficient separation and concentration of magnetic bioadsorbents through electromagnets. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the wastewater treatment device based on magnetic adsorbent of this utility model. Detailed Implementation

[0011] Specific Implementation Method 1: This implementation method for a wastewater treatment device based on magnetic adsorbents includes a raw water tank 1, an adsorption reaction tank 2, two electromagnet devices, an adsorbent storage tank 5, a decanter 6, and a filter press 7. The body 2-1 of the adsorption reaction tank 2 is cylindrical, and the bottom of the adsorption reaction tank 2 is an inverted conical bottom 2-2. The decanter 6 is installed inside the adsorption reaction tank 2, and an outlet pipe is installed on the decanter 6. A first electromagnet device 3 is installed at the lower part of the cylindrical body 2-1 of the adsorption reaction tank 2, and a second electromagnet device 4 is installed at the inverted conical bottom 2-2 of the adsorption reaction tank 2. A sludge discharge port is also opened on the inverted conical bottom 2-2 of the adsorption reaction tank 2. One end of the sludge discharge pipe 13 is connected to the sludge discharge port, and the other end of the sludge discharge pipe 13 is connected to the inlet of the filter press 7. The outlet of the filter press 7 is connected to the return port of the raw water tank 1 through a return pipe 12.

[0012] The first outlet of the raw water tank 1 is connected to the inlet of the adsorption reaction tank 2 through the first water pipe 10. One end of the second water pipe 11 is connected to the second outlet of the raw water tank 1, and the other end of the second water pipe 11 is connected to the inlet of the adsorption reaction tank 2. A water jet 9 is installed on the second water pipe 11, and the lower part of the water jet 9 is connected to the adsorbent storage tank 5. The adsorbent storage tank 5 is filled with magnetic adsorbent.

[0013] Specific Implementation Method Two: The difference between this implementation method and Specific Implementation Method One is that liquid level sensors are installed in both the raw water tank 1 and the adsorption reaction tank 2.

[0014] Specific Implementation Method 3: This implementation method differs from Specific Implementation Method 1 or 2 in that a stirrer 8 is provided in the adsorption reaction tank 2.

[0015] Specific Implementation Method Four: This implementation method differs from one of the specific implementation methods one to three in that the decanter 6 is a float-type decanter.

[0016] Specific Implementation Method 5: This implementation method differs from Specific Implementation Methods 1 to 4 in that the first electromagnet device 3 is installed on the lifting platform.

[0017] Example: This example of a wastewater treatment device based on magnetic adsorbent includes a raw water tank 1, an adsorption reaction tank 2, two electromagnet devices, an adsorbent storage tank 5, a decanter 6, a filter press 7, and a stirrer 8. The adsorption reaction tank 2 has a cylindrical body 2-1 and an inverted conical bottom 2-2. The decanter 6 is installed inside the adsorption reaction tank 2 and has an outlet pipe. A stirrer 8 is installed inside the adsorption reaction tank 2. A first electromagnet device 3 is installed at the lower part of the cylindrical body 2-1 of the adsorption reaction tank 2. The magnet device 3 is set on the lifting platform. The second electromagnet device 4 is set on the inverted conical bottom 2-2 of the adsorption reaction tank 2. The first electromagnet device 3 and the second electromagnet device 4 are both circular. The inverted conical bottom 2-2 of the adsorption reaction tank 2 also has a sludge discharge port. One end of the sludge discharge pipe 13 is connected to the sludge discharge port, and the other end of the sludge discharge pipe 13 is connected to the inlet of the filter press 7. The outlet of the filter press 7 is connected to the return port of the raw water tank 1 through the return pipe 12. The filter press 7 is a plate and frame filter press. The sludge cake obtained by pressing is sent to the incinerator.

[0018] The first outlet of the raw water tank 1 is connected to the inlet of the adsorption reaction tank 2 through the first water pipe 10. One end of the second water pipe 11 is connected to the second outlet of the raw water tank 1, and the other end of the second water pipe 11 is connected to the inlet of the adsorption reaction tank 2. A water jet injector 9 is installed on the second water pipe 11, and the lower part of the water jet injector 9 is connected to the adsorbent storage tank 5. The adsorbent storage tank 5 is filled with magnetic adsorbent. Water pumps are installed on both the first water pipe 10 and the second water pipe 11.

[0019] In this embodiment, a concentration meter is also installed at the inverted conical bottom 2-2 of the adsorption reaction tank 2. The magnetic adsorbent in the adsorbent storage tank 5 is drawn into the water jet 9 by the negative pressure generated by the water jet 9, mixes with the wastewater, and enters the adsorption reaction tank 2.

[0020] This embodiment designs an integrated treatment process of "magnetic adsorption + magnetic separation and recovery". Without adjusting the actual pH value of the wastewater, this process reduces the concentration of Cr(VI) ions from approximately 57.6–63.1 mg / L to 0.5–1.5 mg / L through adsorption by a magnetic composite adsorbent. The wastewater then undergoes inclined plate sedimentation and electromagnetic separation, achieving highly efficient separation by the magnetic adsorbent.

[0021] In this embodiment, a wastewater treatment device based on magnetic adsorbent is used to treat chromium plating wastewater. One operating cycle takes 180 minutes, and the treatment volume per cycle is 120L, meaning the device's capacity is 40L / h. The operating time is allocated as follows: 10 minutes for influent, 135 minutes for stirring and reaction, 20 minutes for sedimentation (5 minutes of stillness + 10 minutes of settling + 5 minutes of stillness), 10 minutes for effluent, and 5 minutes for sludge discharge (3 minutes of strong magnetic concentration and sedimentation + 2 minutes of sludge discharge). 117L of water enters the adsorption reaction tank through a gate, and an additional 3L of water is pumped in to draw the magnetic adsorbent into the reaction device under negative pressure. The stirring action of the agitator increases the diffusion rate of heavy metal ions on the adsorbent surface, thereby improving the adsorption efficiency.

[0022] In this embodiment, a first electromagnet device 3 is installed at the lower part of the cylindrical tank 2-1 of the adsorption reaction tank 2 for magnetic adsorbent recovery in the reaction system. A second electromagnet device 4 is installed at the inverted conical bottom 2-2 of the adsorption reaction tank 2 for continuously compressing the bio-adsorbent sludge and discharging the sludge. The first electromagnet device 3 separates the adsorbent from the aqueous solution through magnetic attraction. The cylindrical annular electromagnet rises with the lifting device, and the electromagnet is turned on. The magnetic field strength is about 0.5 to 1.0T. After settling for 5 minutes, the electromagnet begins to descend. During this process, the magnetic field strength remains unchanged for 5 minutes, and the adsorbent settles to the bottom of the cylindrical tank. At this time, the decanter descends to the bottom, and the decanting rate is 75%. After the water is discharged, the first electromagnet device is turned off. Simultaneously activate the second electromagnet device 4 at the bottom of the cone (with a magnetic field 3 times stronger than that of the electromagnetic settling zone). After 3 minutes of accelerated clarification by the electromagnet, the high-concentration sludge layer in the electromagnetic clarification zone will accelerate its downward movement to the concentration zone at the bottom of the cone. The concentration time is about 10 minutes. A sludge sensor is installed at the bottom of the adsorption reaction tank. When the sludge concentration exceeds 30,000 mg / L, sludge can be discharged. The sludge discharge cycle is generally 5 minutes. After the sludge discharge is completed, close the bottom electromagnet and the sludge discharge valve. After the above sludge discharge is completed, raise the first electromagnet device 3 while water is being introduced.

[0023] The chromium plating wastewater enters the raw water tank, controlled by a level sensor. Raw water intake stops when the level reaches the maximum (50cm), and wastewater enters when the level drops below 15cm. After several cycles, the drain valve is opened to discharge the settled sludge from the raw water tank. The chromium plating wastewater then enters the adsorption reaction tank. The inlet is divided into two streams: one stream enters the raw water, and the other stream is drawn into the adsorbent via a water jet injector under negative pressure. After the inlet is complete, the agitator is activated, initiating the adsorption stage, which lasts 135 minutes. During this stage, all magnets are de-energized, and all valves are closed. After the adsorption reaction is complete, the agitator stops, and after 5 minutes of settling, the first electromagnet descends, allowing for another 5 minutes of settling. After settling, the outlet valve is opened to discharge water, controlled by a level sensor, stopping when the water reaches the bottom level. After the water discharge is completed, the electromagnet of the first electromagnet device is turned off, and the second electromagnet device at the bottom of the conical pool is turned on. After the adsorbent is further concentrated and settled for 3 minutes, the sludge discharge valve is opened for 2 minutes of sludge discharge. After the sludge discharge is completed, the electromagnet is turned off, and the discharged mud and water are sent to the plate and frame filter press. The filter cake is sent to the incinerator, and the effluent is returned to the raw water tank.

Claims

1. A wastewater treatment device based on a magnetic adsorbent, characterized in that The wastewater treatment device based on magnetic adsorbent includes a raw water tank (1), an adsorption reaction tank (2), two electromagnet devices, an adsorbent storage tank (5), a decanter (6), and a filter press (7). The tank body (2-1) of the adsorption reaction tank (2) is cylindrical, and the bottom of the tank body (2) is an inverted conical bottom (2-2). The decanter (6) is installed inside the adsorption reaction tank (2), and an outlet pipe is installed on the decanter (6). A first electromagnet device (3) is provided at the bottom of 2-1), and a second electromagnet device (4) is provided at the inverted conical bottom (2-2) of the adsorption reaction tank (2). A sludge discharge port is also opened on the inverted conical bottom (2-2) of the adsorption reaction tank (2). One end of the sludge discharge pipe (13) is connected to the sludge discharge port, and the other end of the sludge discharge pipe (13) is connected to the inlet of the filter press (7). The outlet of the filter press (7) is connected to the return port of the raw water tank (1) through the return pipe (12). The No. 1 outlet of the raw water tank (1) is connected to the inlet of the adsorption reaction tank (2) through the first water pipe (10). One end of the second water pipe (11) is connected to the No. 2 outlet of the raw water tank (1), and the other end of the second water pipe (11) is connected to the inlet of the adsorption reaction tank (2). A water jet (9) is installed on the second water pipe (11). The lower part of the water jet (9) is connected to the adsorbent storage tank (5). The adsorbent storage tank (5) is filled with magnetic adsorbent.

2. The magnetic adsorbent-based wastewater treatment device according to claim 1, characterized by Liquid level sensors are installed in both the raw water tank (1) and the adsorption reaction tank (2).

3. The magnetic adsorbent-based wastewater treatment device according to claim 1, characterized by A stirrer (8) is installed in the adsorption reaction tank (2).

4. The magnetic adsorbent ball-based wastewater treatment device according to claim 1, characterized by The decanter (6) is a float-type decanter.

5. The magnetic adsorbent-based wastewater treatment device according to claim 1, characterized by The first electromagnet device (3) is installed on the lifting platform.

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