Treatment system for rainwater recycling

Abstract

The utility model provides a treatment system for rainwater recovery, and relates to the technical field of rainwater treatment, the treatment system comprises a wetland area, a magnetic flocculation device, an ultrafiltration membrane group, a nanofiltration membrane group and a clear water tank which are communicated in sequence, rainwater can flow through the wetland area, the magnetic flocculation device, the ultrafiltration membrane group and the nanofiltration membrane group in sequence to be filtered, and the clear water tank is communicated with the wetland area. The rainwater is gradually purified, so that the rainwater can reach the reclaimed water level and flows into the clean water tank; the treated rainwater can be used for toilet flushing, greening, road sweeping, car washing and the like, and recycling of the rainwater is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of rainwater treatment technology, and more specifically, relates to a rainwater recycling system. Background Technology

[0002] With the rapid development of my country's national economy and the acceleration of urbanization, water resources have deteriorated, groundwater levels have dropped, and urbanization has replaced the original vegetation and soil with impermeable surfaces, resulting in the loss of a large amount of rainwater. Urbanized rainwater has poor permeability and rainwater is rapidly flowing into urban waterways, increasing the load on urban drainage facilities. The comprehensive utilization and control of rainwater resources has profound significance for our living environment and water ecology. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a rainwater harvesting system that solves the problems mentioned in the background section regarding the difficulty of purifying rainwater, the inability to reach greywater standards, and the inability to achieve rainwater harvesting and reuse.

[0004] To achieve the above objectives, this utility model provides a rainwater recycling system, which includes a wetland area, a magnetic flocculation device, an ultrafiltration membrane module, a nanofiltration membrane module, and a clear water tank connected in sequence. Rainwater can flow through the wetland area, the magnetic flocculation device, the ultrafiltration membrane module, and the nanofiltration membrane module in sequence for filtration, and then flow into the clear water tank.

[0005] Preferably, the rainwater recycling system further includes a media filter, which is disposed between the magnetic flocculation device and the ultrafiltration membrane module.

[0006] Preferably, the rainwater recycling system further includes a water softener disposed between the media filter and the ultrafiltration membrane module.

[0007] Preferably, the rainwater recycling system further includes an ultrafiltration water tank, which is disposed between the ultrafiltration membrane module and the nanofiltration membrane module.

[0008] Preferably, the rainwater recycling system further includes a precision filter, which is disposed between the ultrafiltration tank and the nanofiltration membrane module.

[0009] Preferably, the wetland area includes:

[0010] The wetland area has, from top to bottom, a plant layer, a protective layer, an impermeable layer, and a compacted layer.

[0011] A water inlet pipe, wherein the water inlet pipe is connected to one end of the interior of the wet area;

[0012] A water outlet pipe, which is connected to the other end of the interior of the wet area.

[0013] Preferably, the magnetic flocculation device comprises:

[0014] A mixing tank, wherein the mixing tank is provided with coagulant, coagulant aid and magnetic seed;

[0015] A sedimentation tank, which is connected to the mixing tank;

[0016] A sludge pump, which is connected to the sedimentation tank;

[0017] A magnetic powder recovery machine, which is connected to the sludge pump and the mixing tank.

[0018] Preferably, the ultrafiltration membrane module includes hollow fiber membrane fibers, and the filtration pore size of the hollow fiber membrane fibers is set to 0.002-0.1 micrometers.

[0019] Preferably, the nanofiltration membrane assembly is cylindrical and includes, from the inside out, a permeate filter core column, a nanofiltration membrane, a diaphragm mesh, a nanofiltration membrane, and a shell.

[0020] Preferably, the rainwater recycling system further includes a variable frequency water supply device, and the clean water tank is connected to the variable frequency water supply device.

[0021] This utility model provides a rainwater recycling system, the advantages of which are: the system is sequentially connected to a wetland area, a magnetic flocculation device, an ultrafiltration membrane module, a nanofiltration membrane module, and a clear water tank. Rainwater can flow through the wetland area, the magnetic flocculation device, the ultrafiltration membrane module, and the nanofiltration membrane module in sequence to gradually purify the rainwater so that it reaches the level of greywater and flows into the clear water tank. The treated rainwater can then be used for toilet flushing, landscaping, road cleaning, and car washing, thus realizing the recycling and reuse of rainwater.

[0022] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0023] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0024] Figure 1 The flowchart of a rainwater harvesting system according to an embodiment of the present invention is shown. Figure 1 ;

[0025] Figure 2The flowchart of a rainwater harvesting system according to an embodiment of the present invention is shown. Figure 2 ;

[0026] Figure 3 A cross-sectional schematic diagram of a wetland area of ​​a rainwater harvesting system according to an embodiment of the present invention is shown.

[0027] Figure 4 A schematic diagram of the inlet and outlet water pipe structure of a rainwater harvesting treatment system for a wetland area is shown according to an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Wetland area; 2. Magnetic flocculation device; 3. Ultrafiltration membrane module; 4. Nanofiltration membrane module; 5. Clear water tank; 6. Media filter; 7. Water softener; 8. Ultrafiltration water tank; 9. Precision filter; 10. Wetland area; 11. Plant layer; 12. Protective layer; 13. Impermeable layer; 14. Compacted layer; 15. Inlet pipe; 16. Outlet pipe. Detailed Implementation

[0030] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0031] like Figure 1 As shown, this utility model provides a rainwater recycling system, which includes a wetland area, a magnetic flocculation device, an ultrafiltration membrane group, a nanofiltration membrane group, and a clear water tank connected in sequence. Rainwater can flow through the wetland area, the magnetic flocculation device, the ultrafiltration membrane group, and the nanofiltration membrane group in sequence for filtration, and then flow into the clear water tank.

[0032] Specifically, to address the problem that existing rainwater treatment systems are not good at purifying rainwater to the level of greywater and cannot achieve rainwater recycling, this utility model provides a rainwater recycling system. This system is sequentially connected to a wetland area 1, a magnetic flocculation device 2, an ultrafiltration membrane module 3, a nanofiltration membrane module 4, and a clear water tank 5. Rainwater flows sequentially through the wetland area 1, the magnetic flocculation device 2, the ultrafiltration membrane module 3, and the nanofiltration membrane module 4 to gradually purify the rainwater, enabling it to reach greywater quality before flowing into the clear water tank 5. The treated rainwater can then be used for toilet flushing, landscaping, road cleaning, and car washing, thus achieving rainwater recycling.

[0033] This treatment system can handle the abundant rainwater resources during the annual rainy season, and can achieve sustainable garden ecology that saves resources, maintains ecological balance, and promotes shared development.

[0034] Preferably, the rainwater recycling system further includes a media filter, which is disposed between the magnetic flocculation device and the ultrafiltration membrane module.

[0035] Specifically, after being filtered by the magnetic flocculation device 2, the rainwater enters the media filter 6, which further filters the water. The media filter 6 can use quartz sand or other materials as the filter medium. Under a certain pressure, the rainwater with high turbidity is filtered through a certain thickness of granular or non-granular media, effectively intercepting and removing suspended solids, organic matter, colloidal particles, microorganisms, chlorine, odors, and some heavy metal ions in the water, ultimately achieving the effect of reducing water turbidity and purifying water quality.

[0036] Preferably, the rainwater harvesting system also includes a water softener, which is disposed between the media filter and the ultrafiltration membrane module.

[0037] Specifically, the water softener is a fully automatic water softener. The water produced by the media filter 6 enters the fully automatic water softener for softening. Since the hardness of water is mainly formed by calcium and magnesium, the working principle of the fully automatic water softener is to pass the water through the sodium-type cation exchange resin, so that the hardness components Ca2+ and Mg2+ in the rainwater exchange with the Na+ in the resin, thereby adsorbing the Ca2+ and Mg2+ in the rainwater and softening the rainwater.

[0038] Preferably, the rainwater harvesting system further includes an ultrafiltration water tank, which is located between the ultrafiltration membrane module and the nanofiltration membrane module.

[0039] Specifically, the ultrafiltration water tank is a container for rainwater transfer.

[0040] Preferably, the rainwater harvesting system further includes a precision filter, which is disposed between the ultrafiltration tank and the nanofiltration membrane module.

[0041] like Figure 3 and Figure 4 As shown, preferably, the wetland area includes:

[0042] The wetland area consists of a vegetation layer, a protective layer, an impermeable layer, and a compacted layer, arranged from top to bottom.

[0043] The water inlet pipe is connected to one end of the interior of the wet area.

[0044] The water outlet pipe connects to the other end of the wet area.

[0045] Specifically, the plant layer 11 consists of various flowering and foliage varieties such as water onion, red knotweed, yellow iris, small-leaved privet, asters, iris, iris, and purslane; the protective layer 12 consists of coarse sand and gravel; the impermeable layer 13 consists of impermeable geotextile; and the compacted layer consists of compacted plain soil. First, the rainwater is initially treated in the artificial wetland area 1. The artificial wetland area 1 is a man-made and controlled surface similar to a marshland. Rainwater is guided into the artificially constructed wetland area 1 in a controlled manner. During the flow of rainwater in a certain direction, the rainwater is initially treated by the physical, chemical, and biological synergistic effects of soil, plants, and microorganisms.

[0046] Through the combined physical, chemical, and biological processes of the media, plants, and microorganisms in constructed wetland area 1, larger pollutants and rainwater that has absorbed some phosphorus and nitrogen are initially filtered out before entering the magnetic flocculation device.

[0047] Artificial wetland area 1 can be built on the existing green infrastructure. In addition to its water purification function, artificial wetland area 1 can also be integrated with the existing greenery in the park, achieving a harmonious unity between economic value and landscape ecology.

[0048] Preferably, the magnetic flocculation device includes:

[0049] The mixing tank contains coagulant, coagulant aid, and magnetic seed.

[0050] Sedimentation tank, which is connected to the mixing tank;

[0051] Sludge pump, which is connected to the sedimentation tank;

[0052] The magnetic powder recovery machine is connected to the sludge pump and mixing tank.

[0053] Specifically, rainwater can be drawn from the artificial wetland area 1 to the magnetic flocculation device 2 by a booster pump. The magnetic flocculation device 2 adds coagulant, coagulant aid and magnetic seeds to the rainwater, so that the fine particulate pollutants in the rainwater flocculate and combine with the magnetic seeds. The gravity of the magnetic seeds achieves efficient sedimentation of the flocs. Magnetic filtration can remove the pollutants from the rainwater.

[0054] Preferably, the ultrafiltration membrane module includes hollow fiber membrane fibers, and the filtration pore size of the hollow fiber membrane fibers is set to 0.002-0.1 micrometers.

[0055] Specifically, the softened rainwater enters the ultrafiltration membrane module for high-precision filtration. The ultrafiltration membrane module is a tangential flow of fluid on the surface of hollow fiber membrane fibers. It is driven by low pressure and separates and filters according to the molecular weight of the solute. It is a physical separation process that does not involve any phase change. The pore size of the ultrafiltration membrane module 3 is set in the range of 0.002 to 0.1 micrometers. Dissolved substances and substances smaller than the pore size will pass through the hollow fiber membrane fibers as permeate. Substances that cannot pass through the hollow fiber membrane fibers will be slowly concentrated in the discharge liquid and then discharged to other process sections for treatment through backwashing or chemical cleaning.

[0056] Ultrafiltration membrane module 3 adopts an external pressure filtration method. During the filtration process, the raw liquid flows through the outer wall of the hollow fiber membrane and is driven by the pressure difference to permeate through the hollow fiber membrane from the outside to the inside in a radial direction, becoming the permeate. The pollutants are trapped on the outside of the hollow fiber membrane.

[0057] Ultrafiltration membrane module 3 can effectively remove particles, colloids, bacteria, viruses, pyrogens, proteins and macromolecular organic matter in water.

[0058] Preferably, the nanofiltration membrane module is cylindrical and includes, from the inside out, a permeate filter core column, a nanofiltration membrane, a diaphragm mesh, a nanofiltration membrane, and a shell.

[0059] Specifically, the water produced by ultrafiltration membrane module 3 enters the nanofiltration membrane module from the ultrafiltration water tank for higher precision filtration. The nanofiltration membrane mainly removes solute particles with a diameter of about 1 nanometer and retains molecular weights of 100 to 1000. The nanofiltration membrane has a NaCl removal rate of 90%. The ultrafiltration membrane module 3 can remove almost all dissolved substances, microorganisms and viruses.

[0060] Preferably, the rainwater harvesting system also includes a variable frequency water supply device, and the clean water tank is connected to the variable frequency water supply device.

[0061] Specifically, the water produced by the nanofiltration membrane module enters the clear water tank 5, and the clear water is finally output according to demand through the variable frequency water supply device.

[0062] In summary, as Figure 2As shown, when the rainwater harvesting system of this utility model is implemented, the system is sequentially connected to a wetland area 1, a magnetic flocculation device 2, a media filter 6, a water softener 7, an ultrafiltration membrane module 3, an ultrafiltration water tank 8, a precision filter 9, a nanofiltration membrane module 4, and a clean water tank 5. Rainwater can flow through the wetland area 1, magnetic flocculation device 2, media filter 6, water softener 7, ultrafiltration membrane module 3, ultrafiltration water tank 8, precision filter 9, and nanofiltration membrane module 4 in sequence to gradually purify the rainwater so that it reaches the level of greywater and flows into the clean water tank 5. The treated rainwater can be used for toilet flushing, greening, road cleaning, and car washing, etc., realizing the recycling of rainwater. This system is environmentally friendly and aesthetically pleasing, simple to operate, highly economical, has good ecological benefits, and is self-sufficient, realizing the circular utilization of water resources.

[0063] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A rainwater harvesting system, characterized in that, The treatment system includes a wetland area, a magnetic flocculation device, an ultrafiltration membrane module, a nanofiltration membrane module, and a clear water tank connected in sequence. Rainwater can flow through the wetland area, the magnetic flocculation device, the ultrafiltration membrane module, and the nanofiltration membrane module in sequence for filtration, and then flow into the clear water tank. The magnetic flocculation device includes: A mixing tank, wherein the mixing tank is provided with coagulant, coagulant aid and magnetic seed; A sedimentation tank, which is connected to the mixing tank; A sludge pump, which is connected to the sedimentation tank; A magnetic powder recovery machine, which is connected to the sludge pump and the mixing tank.

2. The rainwater harvesting system according to claim 1, characterized in that, The rainwater recycling system also includes a media filter, which is disposed between the magnetic flocculation device and the ultrafiltration membrane module.

3. The rainwater harvesting system according to claim 2, characterized in that, The rainwater harvesting system also includes a water softener, which is disposed between the media filter and the ultrafiltration membrane module.

4. The rainwater harvesting system according to claim 1, characterized in that, The rainwater recycling system also includes an ultrafiltration water tank, which is disposed between the ultrafiltration membrane module and the nanofiltration membrane module.

5. A rainwater harvesting system according to claim 4, characterized in that, The rainwater harvesting system also includes a precision filter, which is disposed between the ultrafiltration tank and the nanofiltration membrane module.

6. A rainwater harvesting system according to claim 1, characterized in that, The wetland area includes: The wetland area has, from top to bottom, a plant layer, a protective layer, an impermeable layer, and a compacted layer. A water inlet pipe, wherein the water inlet pipe is connected to one end of the interior of the wet area; A water outlet pipe, which is connected to the other end of the interior of the wet area.

7. A rainwater harvesting system according to claim 1, characterized in that, The ultrafiltration membrane module includes hollow fiber membrane fibers, and the filtration pore size of the hollow fiber membrane fibers is set to 0.002-0.1 micrometers.

8. A rainwater harvesting system according to claim 1, characterized in that, The nanofiltration membrane module is cylindrical and includes, from the inside out, a permeate filter core column, a nanofiltration membrane, a diaphragm mesh, a nanofiltration membrane, and a shell.

9. A rainwater harvesting system according to claim 1, characterized in that, The rainwater harvesting system also includes a variable frequency water supply device, and the clean water tank is connected to the variable frequency water supply device.

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