Landscape water system grading water purification system

Abstract

The invention relates to a graded water purification system for a landscape water system. The system comprises a water pumping unit, a filtering unit and an interstage flow guide pipe, the water pumping unit is used for extracting raw water; the filtering unit comprises a preliminary filtering unit and a multi-stage platform structure; the primary filtering unit is an integrated disinfection filtering well and is used for receiving raw water conveyed by the water pumping unit, and filtering equipment and an ultraviolet disinfection device are arranged in the primary filtering unit; the first stage of platform of the multi-stage platform structure is filled with a water purification module for primarily purifying a water body; the subsequent stages of platforms are filled with water purification ceramsite layers with different particle sizes, and the particle sizes of the ceramsite are gradually reduced step by step; the inter-stage flow guide pipe is buried at the bottom of the ceramsite layer, and the purified water of the previous stage is conveyed to the surface layer of the platform of the next stage.

Description

Technical Field

[0001] This application relates to the field of environmental engineering and water environment management technology, and in particular to a graded water purification system for landscape water systems. Background Technology

[0002] To ensure the water supply of landscape water systems, ecological water replenishment or river replenishment methods are often adopted. River-side water systems often draw water directly from the riverbed. However, the unstable water quality of rivers, especially those involving combined sewer overflows, inevitably leads to water pollution during rainfall, which in turn contaminates the landscape water system. This not only affects the recreational function of the landscape water system but may even lead to its closure for rectification, resulting in operational and maintenance losses, a negative visitor experience, and ultimately impacting the area's popularity. Summary of the Invention

[0003] The purpose of this application is to overcome the water pollution problem caused by rainfall in combined sewer systems, thereby providing a tiered water purification system for landscape water systems. To ensure that the extracted river water meets the requirements of the landscape water system, a water purification platform is designed and implemented. Through engineering measures, the water is purified step by step, ultimately achieving the goal of ensuring that the water discharged into the water system meets the design requirements. It is simple, practical, has low operating costs, and provides good landscape effects.

[0004] To solve the above-mentioned technical problems, the technical solution of this application provides a landscape water system graded water purification system, characterized in that the system includes: The pumping unit is used to extract raw water; The filtration unit includes a preliminary filtration unit and a multi-stage terrace structure; The preliminary filtration unit is an integrated disinfection and filtration well that receives raw water from the pumping unit and is equipped with filtration equipment and ultraviolet disinfection device. The first-level terrace of the multi-level terrace structure is filled with a water purification module to perform primary purification of the water. Subsequent terraces are filled with water purification ceramic particles of different particle sizes, with the particle size of the ceramic particles decreasing at each level. Interstage diversion pipes are buried at the bottom of the ceramsite layer to transport purified water from the previous stage to the surface of the next stage terrace.

[0005] As an improvement to the above system, the preliminary filtering unit includes: An ecological purification layer covers each terrace and consists of non-woven geotextile, ecological planting rolls, gravel layer, and wetland plants laid from bottom to top.

[0006] As a further improvement to the above system, the water purification module has a grid-like permeable structure, forming an aerobic activity space inside.

[0007] As a further improvement to the above system, the roots of the wetland plants absorb nutrients, heavy metal ions and organic pollutants from the water, and increase the dissolved oxygen content of the water through photosynthesis.

[0008] As a further improvement to the above system, the particle size configuration of the water purification ceramic granule layer is as follows: the first-stage terrace has a particle size of 10–15 mm, the second-stage terrace has a particle size of 5–10 mm, and the third-stage terrace has a particle size of 3–5 mm.

[0009] As a further improvement to the above system, the terrace structure is made of reinforced concrete, and the filling thickness of the purified ceramsite layer is 1.5m.

[0010] As a further improvement to the above system, the interstage diversion pipe connects to the landscape water system at the outlet of the final terrace to form a water supply after graded purification.

[0011] As a further improvement to the above system, a drain pipe is installed at the bottom of the multi-level terraces to drain water into the next level terrace.

[0012] The advantages of this application lie in its step-by-step purification process, which includes filter filtration, ultraviolet disinfection, dissolved oxygen absorption by wetland plants, and water-purifying ceramic granules (modules), ultimately purifying turbid river water into landscape water system water that meets environmental protection and design requirements. This application primarily employs engineering measures to achieve the water purification effect, resulting in lower operation and maintenance costs during the purification process. Furthermore, the landscape nodes formed by the step-by-step water purification terraces have a strong aesthetic appeal. This application innovatively utilizes multi-stage, graded water purification to gradually reduce water pollutants. This application researches, designs, and constructs a novel water purification terrace project. It features a simple structure, reasonable design, convenient construction, good finished results, and low construction costs. Attached Figure Description

[0013] Figure 1 This is a top view of a graded water purification system provided in an embodiment of this application.

[0014] Figure 2 This is a schematic diagram of the first-level terrace cross-section provided for an embodiment of this application.

[0015] Figure 3 This is a diagram of a water purification module provided in an embodiment of this application.

[0016] Figure 4 This is a cross-sectional view of the graded water purification system provided in the embodiments of this application.

[0017] Figure 5 This is a side view of the graded water purification system provided in the embodiments of this application.

[0018] Attached Figure Labels Detailed Implementation

[0019] The technical solutions provided in this application are further illustrated below with reference to the embodiments.

[0020] The operation of this landscape water system's graded water purification system begins in the collection pit 30, where a submersible pump 29 draws raw water from the river. The raw water is then transported to the equipment well 22 via the water supply pipe 15. Inside the equipment well 22, a filtration device 26 performs preliminary mechanical filtration, followed by ultraviolet disinfection by an ultraviolet disinfection device 27. The flow rate for this process is regulated by a worm gear butterfly valve 28. The power supply and automatic control of the entire pretreatment unit are managed and transmitted via a power line 24 from a control box 23, while the raw water is connected via a pipeline to the pump station 25.

[0021] The pretreated water first enters the first-stage purification platform, which is filled with water purification modules 10 for primary purification. The water then flows into the second and third-stage platforms, which are filled with water purification ceramsite 18 of varying particle sizes (decreasing progressively) for fine filtration. All platforms are constructed on a solid concrete foundation 11 and a concrete subbase 12, beneath which lie a layer of graded sand and gravel 13 and plain soil 14. In each terrace, a non-woven geotextile 9 is laid on top of the purification material layer as an isolation layer to prevent impurities from clogging the filter material in the lower layer. On top of this, an ecological planting roll 2 and a gravel 17 layer are laid, and the outermost layer is planted with wetland plants 1, whose roots can absorb pollutants in the water and increase dissolved oxygen through photosynthesis. Water flow between different terrace levels is achieved through a piping system buried at the bottom of the ceramsite layer. Drain pipe 19 discharges the purified water from the previous level, which then flows through a pipe equipped with a shut-off valve 20, and is transported to the surface of the next terrace via unions 3, elbows 16, and other fittings and guide pipes 5. Waterproof sleeves 4 ensure a tight seal where pipes pass through walls. A drain well 21 at the end of the system is used to drain water from the terraces during maintenance or winter to prevent damage from frost heave. In addition, pine stakes 8 are used for structural positioning and are fixed and connected by components such as stainless steel expansion bolts 7 and steel wire ropes 6, jointly ensuring the stability and functionality of the entire system structure. Finally, after synergistic purification through multi-stage physical filtration, plant ecological absorption, and ultraviolet disinfection, the effluent with significantly improved water quality is supplied to the landscape water system.

[0022] like Figure 1 and Figure 2As shown, the integrated irrigation pumping station pumps water from the river to the first-stage equipment well 22 of the water purification platform. The well is equipped with a filtration device 26 and an ultraviolet disinfection device 27 to perform preliminary filtration and disinfection of the water. Then, the water passes through the first-stage platform and undergoes the first purification through the water purification module 10. The water is then purified step by step through three stages of platforms. The three stages of platforms respectively use water purification ceramic particles with a particle size of 10~15mm, 5~10mm, and 3~5mm for secondary purification, ultimately forming a water supply landscape water system that meets the landscape standards. The dimensions of the equipment well (length*width*height) are 4400*2000*2000mm; the dimensions of the control box (length*width*height) are 450*500*600mm; the worm gear butterfly valve is DN100; the flow rate connected to the pump room is 500m³ / d; the dimensions of the filtration equipment are 1850*450mm; the dimensions of the ultraviolet disinfection equipment are 1300*400mm; there are two submersible sewage pumps, one in use and one on standby.

[0023] The reason for using different particle sizes of water purification ceramic particles in the three-stage terrace is as follows: The first-stage terrace (10~15mm) is used for coarse filtration and preliminary interception of contaminants. The larger-diameter ceramic particles form a loose porous structure, preferentially intercepting large suspended solids (such as silt, organic residue, etc.) in the water, reducing the pollution load on subsequent treatment units, preventing rapid clogging of the subsequent fine filter layer, and extending the overall system maintenance cycle. The second-stage terrace (5~10mm) is used for medium-precision purification. Smaller-diameter ceramic particles reduce the pore size, further... It enhances the capture capacity of small and medium-sized particulate pollutants (such as colloids and bacterial aggregates) while providing a stable influent water quality foundation for the next stage; it can receive water from the first stage of treatment, thus sharing some of the load and avoiding the risk of excessive clogging caused by direct entry into the tertiary fine filter layer; the tertiary terrace (3~5mm) is used for high-precision fine filtration. In this stage, the smallest particle size ceramic particles are used to form a dense filter layer, which can efficiently remove tiny suspended solids, algae, and some dissolved pollutants, significantly improving the effluent turbidity index and meeting the water quality standards for landscape or irrigation. The tertiary terrace serves as the final control link to ensure that the final water quality meets the standards.

[0024] like Figure 3 As shown, the water purification module plays a significant role in the primary purification of water. The module adopts a grid-like permeable structure with a high proportion of water storage space. The standard module design supports arbitrary shape combinations and can be assembled on-site without complex tools, significantly shortening the construction period. Before entering, rainwater and sewage must undergo diversion and filtration processes to remove floating and suspended solids and prevent water pump blockage. The water purification module plays a pretreatment role. The internal space of the module is conducive to aerobic activity, inhibiting the growth of anaerobic bacteria and maintaining water quality stability. The water purification module can be, but is not limited to, made of PP material, which is acid and alkali resistant, anti-aging, and has a smooth inner wall that does not easily adhere to impurities, ensuring that the water does not deteriorate during long-term storage.

[0025] like Figure 4 and Figure 5 As shown, a drain pipe 19 is installed at the bottom of the upper-level terrace to drain water into the lower-level terrace. There is also a drain well 21 on the outside. The drain well 21 can drain the water stored in the water purification terrace in winter to prevent the water purification terrace from freezing and to extend its service life.

[0026] Each water purification terrace is constructed of reinforced concrete. Internally, it is backfilled from bottom to top with a 1.5m thick layer of water purification ceramsite 18 (water purification modules), non-woven geotextile 9, ecological planting rolls 2, and crushed stone 17. Wetland plants 1 can be planted on the ecological planting rolls 2. The plant roots can absorb nutrients (such as nitrogen and phosphorus), heavy metal ions (such as cadmium, lead, and mercury), and organic pollutants from the water. Through photosynthesis, they absorb carbon dioxide and release oxygen, increasing the dissolved oxygen content of the water and purifying the water. The ecological planting rolls 2 and crushed stone 17 prevent root rot and enhance erosion resistance. The mesh structure prevents erosion of the soil by wind, heat, and water, while ensuring adequate connectivity between the vegetation and the water system. Most importantly, it allows unobstructed infiltration of surface water, combining the advantages of surface flow wetlands and subsurface flow wetlands. It utilizes the root system of surface vegetation to purify water and the underlying buried water purification particles for tiered filtration.

[0027] Specifically, the definition of a surface flow wetland is also known as free surface flow (surface flow means that wastewater flows on the surface of the filler material, which is closest to natural wetlands; this type of artificial wetland has a shallow water level, with 0.2m to 0.3m of soil or other media at the bottom to provide aquatic plants for rooting and to plant emergent plants; the water depth is adjusted to about 0.1m to 0.6m by water level control facilities; the influent flows openly on the surface of the wetland, flows through the bottom soil layer, and comes into contact with the stems and roots of the plants).

[0028] Specifically, a subsurface flow wetland is an artificial wetland system that purifies wastewater through water flow within a layer of filler material. It includes two main types: horizontal subsurface flow and vertical subsurface flow. Horizontal subsurface flow: Wastewater flows horizontally within the filler material layer (sand, gravel), with the water surface always below the substrate. Vertical subsurface flow: Wastewater infiltrates vertically from top to bottom, flowing through multiple layers of filler material.

[0029] In each water purification platform, water enters through the surface layer and is filtered, decomposed, and purified step by step through wetland plants, gravel, non-woven fabric, and water purification ceramic particles (or water purification modules). Then, it is discharged to the surface layer of the next water purification platform through pipes buried in the water purification ceramic particle layer.

[0030] (1) In actual operation, various design effects can be achieved by changing the water purification filling material.

[0031] (2) In actual operation, water purification modules filled with different purification materials can be used to ensure modularization and systematization of the project and improve the diversity of water purification combinations.

[0032] Those skilled in the art will recognize that the units and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this application.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application, and should all be covered within the scope of the claims of this application.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A graded water purification system for landscape water systems, characterized in that, The system includes: The pumping unit is used to extract raw water; The filtration unit includes a preliminary filtration unit and a multi-stage terrace structure; The preliminary filtration unit is an integrated disinfection and filtration well that receives raw water from the pumping unit and is equipped with filtration equipment and ultraviolet disinfection device. The first-level terrace of the multi-level terrace structure is filled with a water purification module to perform primary purification of the water. Subsequent terraces are filled with water purification ceramic particles of different particle sizes, with the particle size of the ceramic particles decreasing at each level. Interstage diversion pipes are buried at the bottom of the ceramsite layer to transport purified water from the previous stage to the surface of the next stage terrace.

2. The landscape water system graded water purification system as described in claim 1, characterized in that, The preliminary filtering unit includes: An ecological purification layer covers each terrace and consists of non-woven geotextile, ecological planting rolls, gravel layer, and wetland plants laid from bottom to top.

3. The landscape water system graded water purification system as described in claim 1, characterized in that, The water purification module has a grid-like permeable structure, creating an oxygen-rich activity space inside.

4. The landscape water system graded water purification system as described in claim 2, characterized in that, The roots of these wetland plants absorb nutrients, heavy metal ions, and organic pollutants from the water, and increase the dissolved oxygen content of the water through photosynthesis.

5. The landscape water system graded water purification system as described in claim 1, characterized in that, The particle size configuration of the water purification ceramic granule layer is as follows: the first-stage terrace has a particle size of 10–15 mm, the second-stage terrace has a particle size of 5–10 mm, and the third-stage terrace has a particle size of 3–5 mm.

6. The landscape water system graded water purification system as described in claim 1, characterized in that, The terrace structure is made of reinforced concrete, and the thickness of the water-purifying ceramsite layer is 1.5m.

7. The landscape water system graded water purification system according to claim 1, characterized in that, The inter-stage diversion pipe connects to the landscape water system at the outlet of the final terrace, forming a water supply after graded purification.

8. The landscape water system graded water purification system according to claim 1, characterized in that, The bottom of the multi-level terraces is equipped with drainage pipes, through which water is discharged into the next level terrace.

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