Multistage magnetic coagulation sedimentation system for sewage treatment

Abstract

The utility model provides a multi-stage magnetic coagulation sedimentation system for sewage treatment, and aims to solve the technical problems of large occupied area, high energy consumption and incomplete water purification of the existing equipment. The system comprises a water inlet unit, a magnetic coagulation sedimentation tank, a filtration purification tank, a sludge discharge unit and a water outlet unit, the water inlet unit is connected with the upper part of the magnetic coagulative precipitation tank, the water outlet unit is connected with the filtering and purifying tank, and the sludge discharge unit is connected with the bottom of the magnetic coagulative precipitation tank; the magnetic coagulative precipitation tank is located in the filtering and purifying tank, the magnetic coagulative precipitation tank and the filtering and purifying tank are sleeved and fixedly connected, and the magnetic coagulative precipitation tank is lower than the filtering and purifying tank; the magnetic coagulation sedimentation tank comprises a coagulation tank, a flocculation tank, a deep stirring tank and a sedimentation tank which are sequentially connected in series, the filtering and purifying tank comprises a filtering tank and a water purifying tank, the water inlet unit is connected with a magnetic powder feeding device, the coagulation tank is connected with the water inlet unit and a PAC dosing device, the flocculation tank is connected with a PAM dosing device, and the deep stirring tank is connected with a PAC / PAM supplementing device. The system is simple in structure, low in energy consumption and good in effect.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a multi-stage magnetic coagulation sedimentation system for sewage treatment. Background Technique

[0002] The magnetic coagulation sedimentation technology is to synchronously add magnetic powder in the ordinary coagulation sedimentation process, so that it flocculates and combines with pollutants into one body to strengthen the effects of coagulation and flocculation, making the generated flocs denser and stronger, so as to achieve the purpose of high-speed sedimentation. The magnetic powder can be recycled through a magnetic drum. The residence time of the whole process is very short, so for most pollutants including TP, the probability of the reverse dissolution process is very small. In addition, the magnetic powder and flocculant added in the system have good adsorption effects on bacteria, viruses, oil and various tiny particles, so the removal effect of this type of pollutants is better than that of the traditional process.

[0003] In the existing processes for treating sewage by using magnetic coagulation technology, the magnetic coagulation tank, magnetic flocculation tank, sedimentation tank and water purification tank are often designed separately, which easily leads to a large floor area. Moreover, the water after magnetic powder coagulation and flocculation is then introduced into the sedimentation tank, and the filtered water after sedimentation is introduced into the purification tank for disinfection treatment to be purified into reusable domestic water. The water body needs the action of a water pump throughout the process, increasing the energy consumption. In addition, during the operation of the coagulation sedimentation device, the large flocs formed are broken during the flow process, affecting the effluent quality. In order to ensure the effluent quality, the common practice is to increase the dosing amount to ensure that the large flocs will not break, but this practice will cause residual agents in the effluent, causing secondary pollution to the natural water body.

[0004] Therefore, it is of great significance to study a magnetic coagulation sedimentation system with a small floor area, low energy consumption and good purification effect. Content of the Utility Model

[0005] The purpose of the utility model is to solve the technical problems of the existing magnetic coagulation sedimentation water treatment equipment with a large floor area, high energy consumption and incomplete water purification. By improving the structure of the magnetic coagulation sedimentation tank and integrating the original equipment, the problem of large floor area is solved. Moreover, the pre-purified water after magnetic coagulation, magnetic flocculation and sedimentation treatment flows into the filtration tank by its own gravity and then flows into the purification tank through the depth filtration and purification of the ultrafiltration layer at the bottom of the filtration tank, and finally is treated into reusable domestic drinking water. Throughout the process, the pre-purified water does not need to be sequentially transported to the filtration tank and the purification tank by a conveying pump, greatly saving the energy consumption. In addition, the setting of the ultrafiltration layer further deeply filters and purifies the residual agents and the like in the water body, ensuring the cleanliness of the water quality and greatly improving the purification effect.

[0006] The utility model adopts the following technical solutions to solve the above technical problems:

[0007] A multi-stage magnetic coagulation sedimentation system for sewage treatment, characterized in that it comprises an inlet unit, a magnetic coagulation sedimentation tank, a filtration and purification tank, a sludge discharge unit and an outlet unit;

[0008] The inlet unit is connected above the magnetic coagulation sedimentation tank, the outlet unit is connected to the filtration and purification tank, and the sludge discharge unit is connected to the bottom of the magnetic coagulation sedimentation tank;

[0009] The magnetic coagulation sedimentation tank is located inside the filtration and purification tank, and the two are sleeved and fixedly connected. The height of the magnetic coagulation sedimentation tank is lower than that of the filtration and purification tank;

[0010] The magnetic coagulation sedimentation tank includes a containing cavity a and a containing cavity b sleeved together. The internal space of the containing cavity a is divided by a partition plate a and a partition plate b into a coagulation tank, a flocculation tank and a deep stirring tank connected in series in sequence. The internal space of the containing cavity b is a sedimentation tank, and the sedimentation tank is located below the coagulation tank, the flocculation tank and the deep stirring tank. The coagulation tank is provided with a coagulation stirring device, the flocculation tank is provided with a flocculation stirring device, and the deep stirring tank is provided with a deep stirring device; the coagulation tank is connected to the inlet unit and a PAC dosing device, the flocculation tank is connected to a PAM dosing device, and the deep stirring tank is connected to a PAC / PAM supplementary dosing device.

[0011] The internal space of the filtration and purification tank is divided by a filter plate into a filtration tank and a purification tank arranged up and down, and a support frame is installed on the outer side surface of the filtration and purification tank.

[0012] As a preferred technical solution:

[0013] Optionally, the inlet unit includes an inlet pipe, a water flow meter is arranged on the inlet pipe, and the inlet pipe is connected to a magnetic powder dosing device.

[0014] Optionally, the sludge discharge unit includes a sludge discharge pipe, a sludge pump arranged on the sludge discharge pipe, and a sludge recovery unit connected to the other end of the sludge pump. The sludge discharge pipe is connected to the bottom of the sedimentation tank.

[0015] Optionally, the sludge recovery unit is further connected to a magnetic powder recovery device. The magnetic powder recovery device includes a high-speed shearer connected to the sludge pump, a magnetic separator connected to the high-speed shearer, and the magnetic powder dosing device connected to the magnetic separator.

[0016] Optionally, the outlet unit includes a drain pipe, an outlet valve arranged on the drain pipe, a water collecting tank connected to the other end of the outlet valve, and a water outlet pipe connected to the bottom of the water collecting tank.

[0017] Optionally, a water quality detector is provided on the water collecting tank, and the water collecting tank is also connected to the filtration tank. A delivery pump is further provided on the pipeline connecting the water collecting tank and the filtration tank.

[0018] Optionally, the bottom of the purification tank is inclined at an angle of 5-15°, and the drain pipe is arranged at the lowest position of the bottom of the tank.

[0019] Optionally, the filter plate is an ultrafiltration plate for water purification. The ultrafiltration plate includes a stainless steel wire mesh layer I, a non-woven fabric layer I, an activated carbon layer, a non-woven fabric layer II, and a stainless steel wire mesh layer II from top to bottom.

[0020] Optionally, the coagulation stirring device, the flocculation stirring device, and the deep stirring device all include a driving motor, a connecting rod, and a stirring head. The driving motor is fixedly connected to the top of the filtration and purification tank; the partition plate a and the partition plate b are also fixedly connected to the top of the filtration and purification tank.

[0021] Optionally, a lifting and lowering driving device for lifting and lowering the coagulation stirring device, the flocculation stirring device, and the deep stirring device is further connected to the tops of the coagulation stirring device, the flocculation stirring device, and the deep stirring device.

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] 1. The multi-stage magnetic coagulation sedimentation system for sewage treatment of the present utility model has a simple structure, is convenient to assemble, is structurally compact, and occupies a small area. By connecting the coagulation tank and the flocculation tank and arranging them in the sedimentation tank, and then arranging the sedimentation tank in the filtration and purification tank, the overall equipment is integrated. Not only the treatment effect is efficient and stable, but also compared with the prior art, the supporting equipment and energy consumption are saved, and the floor area is reduced.

[0024] 2. The multi-stage magnetic coagulation sedimentation system for sewage treatment of the present utility model can supplement coagulant and / or flocculant in the deep stirring tank according to the effluent water quality of the sedimentation tank by arranging a deep stirring tank behind the flocculation tank. Thus, on the basis of ensuring that the suspended solids in the effluent meet the standards stably, the dosage of the medicament is reduced, and the secondary pollution of the medicament to the water body is avoided.

[0025] 3. The multi-stage magnetic coagulation sedimentation system for sewage treatment of the present utility model further purifies the water body by arranging an ultrafiltration plate at the bottom of the filtration tank, ensuring the water quality cleanliness.

[0026] 4. The multi-stage magnetic coagulation sedimentation system for sewage treatment of the present utility model recovers and treats the discharged sludge, separates the magnetic powder again and adds it to the coagulation tank, effectively saving costs.

[0027] 5. The multi-stage magnetic coagulation sedimentation system for sewage treatment of the present utility model is provided with a lifting drive device on the coagulation stirring device, the flocculation stirring device and the deep stirring device. When the coagulation sedimentation tank needs to be cleaned after long-term use, the lifting drive device takes out each stirring device from the sedimentation tank, without the need to shut down the entire production line, which is convenient for cleaning the sediment in the bottom tank and improves production efficiency. Brief Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a structural schematic diagram of the multi-stage magnetic coagulation sedimentation system for sewage treatment of the present utility model;

[0030] Figure 2 It is a structural schematic diagram of the filter plate of the present utility model;

[0031] Reference Numerals:

[0032] 1 - water inlet pipe; 2 - water flow meter; 3 - magnetic powder dosing device; 4 - drain pipe; 5 - outlet valve; 6 - water collection tank; 7 - outlet pipe; 8 - water quality detector; 9 - sludge discharge pipe; 10 - sludge pump; 11 - sludge recovery unit; 12 - magnetic powder recovery device; 13 - partition plate a; 14 - partition plate b; 15 - coagulation tank; 16 - flocculation tank; 17 - deep stirring tank; 18 - sedimentation tank; 19 - filter plate; 20 - filtration tank; 21 - clean water tank; 22 - transfer pump; 23 - support frame; 24 - lifting drive device; 25 - water inlet and outlet.

[0033] 150 - PAC dosing device; 160 - PAM dosing device; 170 - PAC / PAM supplementary dosing device;

[0034] 1500 - coagulation stirring device; 1600 - flocculation stirring device; 1700 - deep stirring device;

[0035] 190 - stainless steel wire mesh layer Ⅰ; 191 - non-woven fabric layer Ⅰ; 192 - activated carbon layer; 193 - non-woven fabric layer Ⅱ; 194 - stainless steel wire mesh layer Ⅱ. Detailed Embodiments

[0036] In the following text, only some exemplary embodiments are briefly described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present utility model. Therefore, the accompanying drawings and the description are considered to be exemplary in nature rather than restrictive.

[0037] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the products of the present utility model are customarily placed during use, or the orientation or positional relationships commonly understood by those skilled in the art. These are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present utility model.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically and clearly defined.

[0039] In the present utility model, unless otherwise clearly specified and defined, the terms "mount", "connect", "couple", "fix", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly defined and limited, the first feature being “above” or “below” the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being “above”, “over” and “on top of” the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being “below”, “beneath” and “underneath” the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0041] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0042] In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0043] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0044] An embodiment of the present utility model provides a multi-stage magnetic coagulation sedimentation system for sewage treatment, as Figure 1 shown, including an inlet unit, a magnetic coagulation sedimentation tank, a filtration and purification tank, a sludge discharge unit and an outlet unit.

[0045] The inlet unit is connected above the magnetic coagulation sedimentation tank. The inlet unit includes an inlet pipe 1, a water flow meter 2 installed on the inlet pipe 1, and the inlet pipe 1 is also connected to a magnetic powder dosing device 3.

[0046] The outlet unit is connected to the filtration and purification tank. The outlet unit includes a drain pipe 4, an outlet valve 5 provided on the drain pipe 4, a collecting tank 6 connected to the other end of the outlet valve 5, and an outlet pipe 7 connected to the bottom of the collecting tank 6. A water quality detector 8 is also provided on the collecting tank 6. During use, when the water quality detector detects that the water quality does not meet the requirements, the water in the collecting tank can be further circulated to the filtration tank for purification.

[0047] The sludge discharge unit is connected to the bottom of the magnetic coagulation sedimentation tank. The sludge discharge unit includes a sludge discharge pipe 9, a sludge pump 10 provided on the sludge discharge pipe 9, and a sludge recovery unit 11 connected to the other end of the sludge pump 10. The sludge recovery unit 11 is also connected to a magnetic powder recovery device 12. The magnetic powder recovery device includes a high-speed shearing machine connected to the sludge pump, a magnetic separator connected to the high-speed shearing machine, and a magnetic powder dosing device 3 connected to the magnetic separator. The high-speed shearing machine and the magnetic separator are not shown in the figure and are consistent with the existing devices. Part of the magnetic powder in the magnetic powder recovery device can be used for other systems, and the other part can enter the magnetic powder dosing device and flow into the water inlet pipe and then into the coagulation tank to achieve recycling.

[0048] The magnetic coagulation sedimentation tank is located inside the filtration and purification tank, and the two are sleeved and fixedly connected. The height of the magnetic coagulation sedimentation tank is lower than that of the filtration and purification tank. The purpose of this setting is to form a gap between the magnetic coagulation sedimentation tank and the filtration and purification tank. The impurities after magnetic coagulation reaction and magnetic flocculation reaction precipitate at the bottom of the sedimentation tank, and the upper clear water flows out from the top of the magnetic coagulation sedimentation tank and into the filtration and purification tank for further filtration and purification, improving the water purification effect and reducing energy consumption.

[0049] The magnetic coagulation sedimentation tank includes a containing cavity a and a containing cavity b sleeved together. The internal space of the containing cavity a is divided by a partition plate a 13 and a partition plate b 14 into a coagulation tank 15, a flocculation tank 16, and a deep stirring tank 17 connected in series in sequence. The internal space of the containing cavity b is a sedimentation tank 18, and the sedimentation tank 18 is located below the coagulation tank 15, the flocculation tank 16, and the deep stirring tank 17. The coagulation tank 15 is connected to the water inlet pipe 1 of the water inlet unit and the PAC dosing device 150. The flocculation tank 16 is connected to the PAM dosing device 160. The deep stirring tank 17 is connected to the PAC / PAM supplementary dosing device 170. A coagulation stirring device 1500 is arranged in the coagulation tank 15, a flocculation stirring device 1600 is arranged in the flocculation tank 16, and a deep stirring device 1700 is arranged in the deep stirring tank 17. The coagulation stirring device 1500, the flocculation stirring device 1600, and the deep stirring device 1700 all include a driving motor, a connecting rod, and a stirring head. The driving motor is fixedly connected to the top of the filtration and purification tank; the partition plate a 13 and the partition plate b 14 are also fixedly connected to the top of the filtration and purification tank. Water outflow inlets and outlets 25 are arranged in a vertically staggered manner on the partition plate a 13, the partition plate b 14, and the side wall of the containing cavity a.

[0050] The internal space of the filtration and purification tank is divided by a filter plate 19 into a filtration tank 20 and a water purification tank 21 arranged vertically. The water collecting tank 6 is also connected to the filtration tank 20. A conveying pump 22 is also arranged on the pipeline connecting the water collecting tank 6 and the filtration tank 20. The bottom of the water purification tank 21 is inclined at 5 - 15°, and the drain pipe 4 is arranged at the lowest position of the bottom of the tank.

[0051] The filter plate 19 is a ultrafiltration plate for water purification. The ultrafiltration plate includes a stainless steel wire mesh layer I 190, a non-woven fabric layer I 191, an activated carbon layer 192, a non-woven fabric layer II 193, and a stainless steel wire mesh layer II 194 from top to bottom, as Figure 2 shown.

[0052] The sludge discharge pipe 9 is connected to the bottom of the sedimentation tank 18, and a support frame 23 is installed on the outer side surface of the filtration tank 20 of the filtration and purification tank.

[0053] The tops of the coagulation stirring device 1500, the flocculation stirring device 1600, and the deep stirring device 1700 are also connected with a lifting and lowering drive device 24 for lifting and lowering the coagulation stirring device, the flocculation stirring device, and the deep stirring device.

Claims

1. A multi-stage magnetic coagulation sedimentation system for sewage treatment, characterized in that: It includes water inlet unit, magnetic coagulation sedimentation tank, filtration purification tank, sludge discharge unit and water outlet unit; The water inlet unit is connected to the top of the magnetic coagulation sedimentation tank, the water outlet unit is connected to the filtration purification tank, and the mud discharge unit is connected to the bottom of the magnetic coagulation sedimentation tank; The magnetic coagulation sedimentation tank is located inside the filtration purification tank, and the two are sleeved and fixedly connected. The height of the magnetic coagulation sedimentation tank is lower than that of the filtration purification tank; The magnetic coagulation sedimentation tank comprises a housing chamber a and a housing chamber b which are sleeved together. The internal space of the housing chamber a is divided into a coagulation tank, a flocculation tank and a deep stirring tank which are connected in series in sequence by a partition plate a and a partition plate b. The internal space of the housing chamber b is a sedimentation tank, which is located below the coagulation tank, the flocculation tank and the deep stirring tank. A coagulation stirring device is provided in the coagulation tank, a flocculation stirring device is provided in the flocculation tank, and a deep stirring device is provided in the deep stirring tank. The coagulation tank is connected to a water inlet unit and a PAC dosing device, the flocculation tank is connected to a PAM dosing device, and the deep stirring tank is connected to a PAC / PAM supplementary dosing device. The inner space of the filtering and purifying pool is divided into a filtering pool and a water purification pool arranged up and down by a filtering plate, and a supporting frame is installed on the outer side surface of the filtering and purifying pool.

2. A multi-stage magnetic coagulation sedimentation system for sewage treatment according to claim 1, characterized in that: The water inlet unit comprises a water inlet pipe, a water flow meter is arranged on the water inlet pipe, and the water inlet pipe is connected to the magnetic powder dosing device.

3. A multi-stage magnetic coagulation sedimentation system for sewage treatment according to claim 2, characterized in that: The sludge discharge unit comprises a sludge discharge pipe, a sludge pump arranged on the sludge discharge pipe and a sludge recovery unit connected to the other end of the sludge pump, and the sludge discharge pipe is connected to the bottom of the sedimentation tank.

4. The multi-stage magnetic coagulation sedimentation system for sewage treatment according to claim 3, characterized in that: The sludge recovery unit is also connected to a magnetic powder recovery device, which includes a high-speed shear connected to the sludge pump, a magnetic separator connected to the high-speed shear, and the magnetic powder dosing device connected to the magnetic separator.

5. The multi-stage magnetic coagulation sedimentation system for sewage treatment according to claim 1, characterized in that: The water outlet unit comprises a drain pipe, a water outlet valve arranged on the drain pipe, a water collecting tank connected to the other end of the water outlet valve, and a water outlet pipe connected to the bottom of the water collecting tank.

6. A multi-stage magnetic coagulation sedimentation system for sewage treatment according to claim 5, characterized in that: A water quality detector is arranged on the water collecting tank, and the water collecting tank is also connected to the filtering pool. A delivery pump is also arranged on the pipeline connecting the water collecting tank and the filtering pool.

7. The multi-stage magnetic coagulation sedimentation system for sewage treatment according to claim 5, characterized in that: The bottom of the water purification pool is inclined at 5-15 degrees, and the drainage pipe is arranged at the lowest position of the pool bottom.

8. The multi-stage magnetic coagulation sedimentation system for sewage treatment according to claim 1, characterized in that: The filter plate is an ultrafiltration plate used for water purification, and the ultrafiltration plate comprises from top to bottom a stainless steel wire mesh layer I, a non-woven fabric layer I, an activated carbon layer, a non-woven fabric layer II and a stainless steel wire mesh layer II.

9. The multi-stage magnetic coagulation sedimentation system for sewage treatment according to claim 1, characterized in that: The coagulation stirring device, flocculation stirring device and deep stirring device all include a driving motor, a connecting rod and a stirring head. The driving motor is fixedly connected to the top of the filtration and purification tank; the partition a and the partition plate b are also fixedly connected to the top of the filtration and purification tank.

10. A multi-stage magnetic coagulation sedimentation system for sewage treatment according to claim 9, characterized in that: The tops of the coagulation stirring device, flocculation stirring device and deep stirring device are also connected with a lifting drive device for lifting and lowering the coagulation stirring device, flocculation stirring device and deep stirring device.

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