Magnetic coagulation coupling dosing device for hardness removal of industrial wastewater
By adopting a magnetic coagulation coupled dosing device in industrial wastewater treatment, the use of magnetic powder and magnesium hydroxide condensation at high pH, combined with an annular overflow effluent weir and inclined pipe precipitation module, industrial wastewater hardening and sludge production are solved. The problem of this achieves the effect of efficient hardening removal and extending the service life of the film.
Patent Information
- Application Number
- CN202420217523.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-01-30
AI Technical Summary
After the reduction of industrial circulating water discharge, the water quality hardness and salt content are high, resulting in an increase in the risk of membrane pollution blockage in the membrane salt removal and reuse system. It is necessary to design a device for industrial wastewater hardening to reduce the dosage and Mud production.
A magnetic coagulation coupled dosing device is designed, including a partition partition structure in the pool body, and through the first dosing area, the second dosing area, the coagulation area, the magnetic loading area, the flocculation area and the precipitation area, the micro-use Hole aeration, magnetic powder feeding and mechanical stirring, combined with annular overflow effluent weir and inclined pipe precipitation module, achieve efficient hardening and reducing mud production.
It achieves efficient hardening removal, reduces the use of flocculant and mud production, extends the backwashing frequency and service life of the membrane, and reduces the system operation cost.
Smart Images
Figure CN222250308U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a dosing device, in particular to a magnetic coagulation coupling dosing device used for removing hardness from industrial waste water, belonging to the technical field of water treatment. Background Art
[0002] In recent years, with the development of China's economy and the acceleration of the pace of industrialization, my country's industrialization has brought a lot of environmental pollution, especially water pollution. Faced with increasingly severe restrictions on water use and discharge, many high-water-consuming industries have taken a series of measures to improve the recycling rate of reclaimed water and zero-discharge technology.
[0003] At present, in response to the problems of industrial circulating water and sewage discharge, domestic enterprises mainly adopt treatment methods such as adding drugs or side filtration to stabilize water quality and reduce sewage discharge, pretreatment softening and double membrane treatment and reuse. By adding corrosion and scale inhibitors to the circulating water, combined with side filtration and other treatment processes, the purpose of stabilizing water quality, increasing concentration rate and reducing sewage discharge can be achieved. However, the hardness and salt content of the circulating water with reduced discharge are relatively high, especially for the treatment system that uses membrane desalination and reuse for the purpose, which increases the risk of membrane fouling. Therefore, it is necessary to design a hardness removal device for industrial wastewater. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a magnetic coagulation coupling dosing device for removing hardness from industrial wastewater, which can remove hardness from industrial wastewater and reduce the dosing amount and mud production.
[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:
[0006] A magnetic coagulation coupling dosing device for removing hardness from industrial wastewater comprises a tank body, which is divided into a first dosing area, a second dosing area, a coagulation area, a magnetic loading area, a flocculation area and a sedimentation area which are sequentially connected by a partition, a water inlet is arranged on the side of the first dosing area, a water outlet is arranged on the side of the sedimentation area, microporous aeration devices are arranged in the first dosing area and the second dosing area, a magnetic powder dosing device is arranged in the magnetic loading area, and an annular overflow water weir is arranged in the sedimentation area.
[0007] Furthermore, the annular overflow weir is fixed on the upper side of the sedimentation zone, an overflow port is arranged on the partition at the junction of the flocculation zone and the sedimentation zone, a first gap is left between the side wall on one side of the annular overflow weir and the partition at the junction of the flocculation zone and the sedimentation zone, a second gap is left between the side wall on the other side of the annular overflow weir and the outer wall of the sedimentation zone, and the water outlet is arranged at the bottom of the second gap corresponding to the outer side wall of the sedimentation zone.
[0008] Furthermore, an inclined tube sedimentation module is provided at the lower end of the annular overflow weir, and the inclined tube sedimentation module is composed of a plurality of inclined tubes.
[0009] Furthermore, a scraper is provided in the sedimentation area, the bottom of the sedimentation area is a conical structure, a sludge discharge outlet is provided at the bottom of the cone at the bottom of the sedimentation area, one end of the sludge discharge pipe is connected to the sludge discharge outlet, and the other end of the sludge discharge pipe passes through the side wall of the sedimentation area.
[0010] Furthermore, the scraper is a heavy-duty four-arm scraper.
[0011] Furthermore, the microporous aeration device is arranged at the bottom of the first dosing area and the second dosing area, and the microporous aeration device is connected to compressed air through a quick-connect interface.
[0012] Furthermore, mechanical stirring devices are provided in the coagulation zone, magnetic loading zone and flocculation zone.
[0013] Furthermore, the mechanical stirring device adopts a three-blade mixer, the blades are made of wear-resistant steel, and the installation position of the mechanical stirring device is no more than 30 cm away from the bottom of the coagulation zone, the magnetic loading zone and the flocculation zone.
[0014] Compared with the prior art, the utility model has the following advantages and effects:
[0015] 1. The utility model adopts the method of magnetic coagulation coupling and dosing to achieve efficient hardness removal. While adding drugs to remove hardness, magnetic powder is added. Under high pH value, the magnetic powder with negative potential and the magnesium hydroxide with positive potential are more likely to coagulate and precipitate together, thereby improving the efficiency of flocculation and precipitation, thereby improving the efficiency of hardness removal;
[0016] 2. The utility model adopts the method of magnetic coagulation coupling and dosing to improve the hardness removal efficiency, while reducing the amount of flocculant used, and the corresponding sludge production is also reduced, so that the operating cost of the whole system is reduced;
[0017] 3. The utility model adopts the method of magnetic coagulation coupling and dosing. The calcium and magnesium ions and magnetic powder residues in the effluent water are far lower than the inlet water quality requirements of UF and RO. Compared with the existing technology, the backwashing frequency and service life of the membrane are extended;
[0018] 4. The overall structure of the magnetic coagulation coupling dosing device for removing hardness from industrial wastewater of the utility model is compact and reasonable. The overflow water in the sedimentation tank is discharged through the annular overflow weir, and the lower part is accelerated by the inclined tube sedimentation module to accelerate the sedimentation and separation, thereby ensuring the hardness removal effect and efficiency of industrial wastewater. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 The utility model is a top view of a magnetic coagulation coupling dosing device for removing hardness from industrial wastewater.
[0020] Figure 2It is a side view of a magnetic coagulation coupling dosing device for removing hardness from industrial wastewater according to the utility model. DETAILED DESCRIPTION
[0021] In order to elaborate on the technical scheme adopted by the utility model to achieve the predetermined technical purpose, the technical scheme in the embodiment of the utility model will be clearly and completely described in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a partial embodiment of the utility model, not all of the embodiments, and the technical means or technical features in the embodiment of the utility model can be replaced without paying creative labor. The utility model will be described in detail with reference to the drawings and in combination with the embodiments.
[0022] like Figure 1 and Figure 2 As shown, the utility model is a magnetic coagulation coupling dosing device for removing hardness from industrial wastewater, comprising a tank body, which is divided into a first dosing zone 1, a second dosing zone 2, a coagulation zone 3, a magnetic loading zone 4, a flocculation zone 5 and a sedimentation zone 6 which are sequentially connected by partitions, a water inlet 7 is arranged on the side of the first dosing zone 1, a water outlet 8 is arranged on the side of the sedimentation zone 6, microporous aeration devices 9 are arranged in the first dosing zone 1 and the second dosing zone 2, a magnetic powder dosing device is arranged in the magnetic loading zone 4, and an annular overflow water weir 10 is arranged in the sedimentation zone 6.
[0023] The annular overflow weir 10 is fixed on the upper side of the sedimentation zone 6, and an overflow port is provided on the partition at the junction of the flocculation zone 5 and the sedimentation zone 6. A first gap 11 is left between the side wall of one side of the annular overflow weir 10 and the partition at the junction of the flocculation zone 5 and the sedimentation zone 6, so that the industrial wastewater in the flocculation zone 5 overflows into the first gap 11 along the overflow port of the partition, and then enters the sedimentation zone 6 along the first gap 11. A second gap 12 is left between the other side wall of the annular overflow weir 10 and the outer side wall of the sedimentation zone 6, and the outlet 8 is provided at the bottom of the second gap 12 corresponding to the outer side wall of the sedimentation zone 6. The upper layer of clear water after sedimentation in the sedimentation zone 6 overflows into the second gap 12 at the upper end of the annular overflow weir 10, and then the clear water is discharged from the outlet 8 at the bottom of the second gap 12.
[0024] An inclined tube sedimentation module 13 is provided at the lower end of the annular overflow weir 10. The inclined tube sedimentation module 13 is composed of a plurality of inclined tubes. The flocculated industrial wastewater passes through the inclined tubes to accelerate sedimentation and improve the sedimentation and separation efficiency of the industrial wastewater.
[0025] A scraper 14 is arranged in the sedimentation zone 6. The bottom of the sedimentation zone 6 is a conical structure. A sludge discharge port 15 is arranged at the bottom of the cone of the sedimentation zone 6. One end of a sludge discharge pipe 16 is connected to the sludge discharge port 15, and the other end of the sludge discharge pipe 16 passes through the side wall of the sedimentation zone 6. Since the height of the tank bodies of the first dosing zone 1, the second dosing zone 2, the coagulation zone 3, the magnetic loading zone 4 and the flocculation zone 5 are all smaller than that of the sedimentation zone 6, and the overflow form is adopted between the tank bodies of the utility model, the bottom of the flocculation zone 5 of the first dosing zone 1, the second dosing zone 2, the coagulation zone 3, the magnetic loading zone 4 and the flocculation zone 5 is suspended by a support frame, and the other end of the sludge discharge pipe 16 passes through the outer wall of the sedimentation zone 6 and is just located in the suspended area at the bottom of the first dosing zone 1, the second dosing zone 2, the coagulation zone 3, the magnetic loading zone 4 and the flocculation zone 5, where a sludge moving and collecting device can be placed, making the overall device structure more compact and reasonable without occupying additional space.
[0026] The scraper 14 adopts a heavy-duty four-arm scraper.
[0027] The microporous aeration device 9 is arranged at the bottom of the first dosing area 1 and the second dosing area 2, and the microporous aeration device 9 is connected to compressed air through a quick-connect interface.
[0028] A mechanical stirring device 17 is provided in the coagulation zone 3, the magnetic loading zone 4 and the flocculation zone 5. The mechanical stirring device 17 adopts a three-blade stirrer, and the blades are made of wear-resistant steel. The installation position of the mechanical stirring device 17 is no more than 30 cm away from the bottom of the coagulation zone 3, the magnetic loading zone 4 and the flocculation zone 5.
[0029] The working principle of the magnetic coagulation coupling dosing device for removing hardness from industrial wastewater of the utility model is as follows: industrial wastewater enters the magnetic coagulation coupling dosing device for removing hardness from industrial wastewater through the water inlet 7 and is mixed with lime and caustic soda in the first dosing area 1, and is fully mixed and reacted through the microporous aeration device 9, and the reaction pH value in the area is measured until the dosing amount makes the pH reach about 11.2. The lime dosage in the first dosing area is controlled to be about 340 mg / L, the caustic soda dosage is about 180 mg / L, and the overall residence time of the wastewater in the first dosing area 1 is about 5 minutes. The wastewater enters the second dosing area 2 through the overflow port, and after the soda ash is added, it is fully mixed and reacted in the microporous aeration device 9, and the soda ash dosage is controlled to be about 42 mg / L. After the dosing, the wastewater enters the coagulation area 3 through the overflow port to undergo a coagulation reaction, and the speed of the mechanical stirring device 17 is controlled at 100-120 r / min, which is conducive to the formation of more magnesium hydroxide and calcium carbonate flocs in the water body. Then, after the wastewater enters the magnetic loading zone 4, magnetic powder is added to the zone through the magnetic powder adding device, the magnetic powder addition amount is about 2%, and the magnetic powder mesh number is 200-400 mesh. Under the action of the mechanical stirring device 17, the wastewater is accelerated to form high-concentration and high-density flocs by adding inert high-density microparticles as flocculation nuclei, which plays a ballast or weighting role to accelerate the sedimentation process. The speed of the mechanical stirring device 17 in the magnetic loading zone is controlled at about 100r / min. After the magnetic powder is loaded, the wastewater enters the flocculation zone 5, and 0.1% PAM1ppm is added to the zone. The small flocs formed by the initial reaction and the magnetic medium are fully mixed and reacted by the mechanical stirring device 17 under the addition of PAM. The small flocs are captured by the net of the uniformly mixed high-molecular PAM, and the magnetic medium is used as the core to form larger flocs. The speed of the mechanical stirring device 17 in the flocculation zone 5 is controlled at 60r / min, and slow stirring is more conducive to forming a floc layer of a certain volume. Wastewater enters the sedimentation area 6 through the overflow plate, and the wastewater is further separated into clean water through the inclined tube sedimentation module 13. After the clean water is separated, it is collected through the annular overflow water weir 10 and discharged to the outlet 8. After the flocs are fully settled in the sedimentation area 6, a sludge layer is formed at the bottom of the pool. After being collected by the scraper 14, the sludge is discharged through the sludge discharge pipe 16. The discharged sludge is separated from the flocs by a magnetic powder separator using shear force, high-speed centrifugal force and permanent magnets. The separated magnetic powder is mixed again and enters the magnetic powder dosing device for reuse. Through actual operation detection and analysis, the hardness of the outlet water in this embodiment is controlled at about 50-100 mg / L, and the alkalinity is controlled at about 70-150 mg / L.
[0030] The utility model adopts a magnetic coagulation coupled dosing method to achieve efficient hardness removal. While adding drugs to remove hardness, magnetic powder is added. Under high pH values, the magnetic powder with negative potential and the magnesium hydroxide with positive potential are more likely to coagulate and precipitate together, thereby improving the efficiency of flocculation and precipitation, thereby improving the efficiency of hardness removal. The utility model adopts a magnetic coagulation coupled dosing method to improve the hardness removal efficiency while reducing the amount of flocculant used, and the corresponding sludge production is also reduced, so that the operating cost of the entire system is reduced. The utility model adopts a magnetic coagulation coupled dosing method, and the calcium and magnesium ions in the effluent water quality and the residual magnetic powder are far lower than the inlet water quality requirements of UF and RO. Compared with the prior art, the backwash frequency and service life of the membrane are extended. The overall structure of the magnetic coagulation coupled dosing device for removing hardness from industrial wastewater of the utility model is compact and reasonable. The overflow water is discharged from the sedimentation tank through a ring overflow weir, and the lower part is accelerated by the inclined tube sedimentation module. Sedimentation and separation ensure the hardness removal effect and efficiency of industrial wastewater.
[0031] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, still fall within the protection scope of the technical solution of the present invention.
Claims
1. A magnetic coagulation coupling dosing device for removing hardness from industrial wastewater, characterized in that: The invention comprises a tank body, which is divided into a first dosing zone, a second dosing zone, a coagulation zone, a magnetic loading zone, a flocculation zone and a sedimentation zone in sequence by a partition. A water inlet is arranged on the side of the first dosing zone, a water outlet is arranged on the side of the sedimentation zone, microporous aeration devices are arranged in the first dosing zone and the second dosing zone, a magnetic powder dosing device is arranged in the magnetic loading zone, and an annular overflow water weir is arranged in the sedimentation zone.
2. The magnetic coagulation coupling dosing device for removing hardness from industrial wastewater according to claim 1 is characterized in that: The annular overflow water outlet weir is fixed on the upper side of the sedimentation zone, an overflow port is arranged on the partition at the junction of the flocculation zone and the sedimentation zone, a first gap is left between the side wall on one side of the annular overflow water outlet weir and the partition at the junction of the flocculation zone and the sedimentation zone, a second gap is left between the side wall on the other side of the annular overflow water outlet weir and the outer wall of the sedimentation zone, and the water outlet is arranged at the bottom of the second gap corresponding to the outer side wall of the sedimentation zone.
3. The magnetic coagulation coupling dosing device for removing hardness from industrial wastewater according to claim 2 is characterized in that: An inclined tube sedimentation module is arranged at the lower end of the annular overflow weir, and the inclined tube sedimentation module is composed of a plurality of inclined tubes.
4. A magnetic coagulation coupling dosing device for removing hardness from industrial wastewater according to claim 3, characterized in that: A scraper is arranged in the sedimentation area. The bottom of the sedimentation area is a conical structure. A sludge discharge outlet is arranged at the bottom of the cone at the bottom of the sedimentation area. One end of the sludge discharge pipe is connected to the sludge discharge outlet, and the other end of the sludge discharge pipe passes through the side wall of the sedimentation area.
5. A magnetic coagulation coupling dosing device for removing hardness from industrial wastewater according to claim 4, characterized in that: The scraper is a heavy-duty four-arm scraper.
6. The magnetic coagulation coupling dosing device for removing hardness from industrial wastewater according to claim 1 is characterized in that: The microporous aeration device is arranged at the bottom of the first dosing area and the second dosing area, and the microporous aeration device is connected to compressed air through a quick-connect interface.
7. The magnetic coagulation coupling dosing device for removing hardness from industrial wastewater according to claim 1 is characterized in that: Mechanical stirring devices are arranged in the coagulation zone, magnetic loading zone and flocculation zone.
8. The magnetic coagulation coupling dosing device for removing hardness from industrial wastewater according to claim 7 is characterized in that: The mechanical stirring device adopts a three-blade stirrer, the blades are made of wear-resistant steel, and the installation position of the mechanical stirring device is no more than 30 cm away from the bottom of the coagulation zone, the magnetic loading zone and the flocculation zone.