A coupling temperature control device and a salt-tolerant constructed wetland system

Abstract

The utility model provides a kind of coupling temperature control device and salt-tolerant artificial wetland system, the system includes water inlet channel, filler pool and water outlet channel in turn, the filler pool includes pool body of four around and bottom and filler structure inside pool body, the filler structure is multilayer composite structure, from bottom to top in turn is temperature control layer, salt-tolerant sandy filler layer, salt-tolerant microorganism immobilization carrier layer and salt-tolerant plant planting layer;The temperature control layer is embedded with geothermal circulation pipe and solar energy heat collection pipe;The salt-tolerant sandy filler layer is divided into three layers from bottom to top in the order of filler particle size from big to small, and wave-shaped guide vane is equipped between each layer;The salt-tolerant microorganism immobilization carrier layer is formed by embedding carrier with salt-tolerant microorganism, and magnetic biochar module is also embedded therein;Salt-tolerant plant is also planted on the salt-tolerant plant planting layer;The utility model realizes the efficient, stable treatment of industrial wastewater plant salt-containing tail water in northern cold region, conducive to promoting the achievement of resource utilization and low-carbon target.

Description

Technical Field

[0001] This utility model relates to the field of water environment management, and in particular to a coupled temperature control device and a salt-resistant constructed wetland system. Background Technology

[0002] Industrial wastewater contains a wide variety of pollutants with fluctuating concentrations. Its composition is complex, containing large amounts of toxic and harmful substances (such as heavy metals, acids, alkalis, and organic compounds). Furthermore, the properties of pollutants vary significantly across different industries, resulting in large concentration variations.

[0003] High salinity and toxicity: Some industrial wastewater (such as chemical and metallurgical industries) has high salt content (Cl-, SO42-, etc.), which has ion toxicity to microorganisms and plants, and contains nitrogen, phosphorus and other substances that can easily cause eutrophication of water bodies.

[0004] The treatment is difficult because the migration patterns of pollutants are complex (such as sedimentation, volatilization, and secondary pollution). Traditional processes are unable to completely remove pollutants, and it takes a long time to restore polluted water bodies.

[0005] Current mainstream treatment methods include physicochemical methods, biological methods, and advanced oxidation methods. Among them, physicochemical methods (such as coagulation sedimentation and membrane separation) have high treatment efficiency and are suitable for high-concentration pollutants, but they have high energy consumption, prominent membrane fouling problems, and cannot achieve resource utilization; biological methods (such as A / O process, SBR process, and MBR process) have low operating costs and are suitable for organic matter degradation, but high-salt environments inhibit microbial activity, treatment efficiency decreases significantly under low-temperature conditions, and it is difficult to simultaneously remove nitrogen and phosphorus; advanced oxidation methods can degrade difficult-to-treat organic matter, but they consume a lot of reagents, are prone to secondary pollution, and have poor economic efficiency.

[0006] Constructed wetlands, as an eco-friendly wastewater treatment technology, have advantages such as low energy consumption and landscape benefits, but they face the following key problems: (1) Poor adaptability to saline tailwater: Conventional wetland plants (such as cattails and canna lilies) are not salt-tolerant enough. High-salt environments cause root osmotic stress, leaf wilting, and even death, which in turn affects the efficiency of pollutant removal. High concentrations of salt will also significantly inhibit the activity of wetland microorganisms, leading to a decrease in treatment efficiency. (2) Low temperature in the north: Reduced microbial activity: When the temperature is below 10℃, the metabolic rate of microorganisms such as nitrifying bacteria decreases, and the removal rates of ammonia nitrogen and total phosphorus are significantly reduced (the reduction can reach 30% to 40%). Plant dormancy and freezing of filler: Low temperature causes plants to stop growing and the oxygen secretion capacity of roots to weaken. The filling layer freezes and blocks the water flow channel, and the hydraulic residence time is out of control. (3) Limitations of traditional heat preservation measures: Covering heat preservation method: (such as ice and snow, reed debris) depends on natural conditions and the heat preservation effect is unstable. Greenhouse method: High cost and complex maintenance, making it difficult to apply on a large scale.

[0007] To address the shortcomings of existing technologies in treating industrial wastewater under the dual stresses of salinity and low temperature, there is an urgent need to construct a salt-tolerant artificial wetland system suitable for treating saline wastewater (water with a salinity of less than 1.5%) from industrial wastewater treatment plants in cold northern regions. Utility Model Content

[0008] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a coupled temperature control device and a salt-resistant constructed wetland system to solve the problem of insufficient performance of the prior art in the treatment of industrial wastewater under the dual stress of salt content and low temperature.

[0009] To achieve the above and other related objectives, this utility model provides a coupled temperature control device, including a solar energy component and a geothermal component. The solar energy component includes a solar collector, a heat medium storage component, and a solar collector tube connected in sequence. The heat medium storage component is adapted to store the heat energy collected by the solar collector and is adapted to transfer the heat energy to the solar collector tube by driving a pump. The geothermal component includes a geothermal collector, a conversion distributor, and a geothermal circulation pipe connected in sequence. The geothermal collector is adapted to transfer the collected geothermal energy to the geothermal circulation pipe through the conversion distributor. The solar collector tube is laid above the geothermal circulation pipe, and the geothermal circulation pipe and the solar collector tube are connected by a bidirectional heat exchange valve.

[0010] This utility model also provides a salt-tolerant constructed wetland system. The system includes an inlet channel, a filler tank, and an outlet channel connected in sequence. The filler tank includes a tank body with four sides and a bottom, as well as a filler structure inside the tank body. The filler structure is a multi-layered composite structure, consisting of a temperature control layer, a salt-tolerant sandy filler layer, a salt-tolerant microbial immobilization carrier layer, and a salt-tolerant plant planting layer from bottom to top. The temperature control layer includes a geothermal circulation pipe and a solar collector pipe, as described above, embedded in quartz sand and coupled with a temperature control device. The temperature control layer is suitable for wetland construction. The system includes auxiliary heating; the salt-tolerant sandy filler layer is divided into three layers from bottom to top, with the filler particle size decreasing, and corrugated guide plates are provided between each layer; the salt-tolerant microbial immobilization carrier layer is composed of carriers embedded with salt-tolerant microorganisms, and magnetic biochar modules are also embedded therein; salt-tolerant plants are also planted on the salt-tolerant plant planting layer; the water inlet channel is connected to the filler pool through an opening at the upper end of the side pool body, and the water outlet channel is connected to the filler pool through an opening at the lower end of the side pool body.

[0011] As described above, the coupling temperature control device and salt-resistant constructed wetland system of this utility model have at least one of the following beneficial effects:

[0012] (1) The coupled temperature control device of this utility model adopts the technology of solar energy and geothermal synergy, which can overcome the problem of wetland functional failure in winter when applied to salt-tolerant artificial wetland system, and help ensure that the wetland still has the purification effect under cold winter conditions.

[0013] (2) The salt-tolerant constructed wetland system of this utility model adopts a multi-layer composite structure in the filler tank. From bottom to top, it consists of a temperature control layer, a salt-tolerant sandy filler layer, a salt-tolerant microbial immobilization carrier layer, and a salt-tolerant plant planting layer. Salt-tolerant plants are planted on the salt-tolerant plant planting layer, which can purify sewage in a saline environment. Magnetic biochar modules are embedded in the salt-tolerant microbial immobilization carrier layer to achieve simultaneous denitrification, phosphorus removal, and heavy metal adsorption. By optimizing the gradient structure of the salt-tolerant sandy filler layer and setting a corrugated guide plate, the water flow path is extended, the suspended solids interception efficiency is enhanced, and the filler layer is prevented from caking. Through the synergistic effect of salt-tolerant plants, microorganisms, and magnetic biochar modules, combined with the geothermal effect of the temperature control layer, the problem of functional failure of constructed wetlands in winter is overcome, ensuring that the constructed wetland still has a purification effect under cold winter conditions. This utility model greatly improves the adaptability and tolerance of the constructed wetland system to saline environments and effectively improves the removal capacity of various pollutants in saline effluent from industrial wastewater treatment plants.

[0014] (3) The salt-tolerant constructed wetland system of this utility model realizes efficient and stable treatment of saline (salinity less than 1.5%) effluent from industrial wastewater treatment plants in cold northern regions, which is conducive to promoting the achievement of resource utilization and low-carbon goals. Attached Figure Description

[0015] Figure 1 This is a plan view of a salt-tolerant constructed wetland system and its coupled temperature control device.

[0016] Figure 2 This is a plan view of the geothermal circulation in the coupled temperature control device.

[0017] Figure 3 This is a plan view of the solar energy circulation in the coupled temperature control device.

[0018] Figure 4 This is a cross-sectional view of the filler structure in a salt-tolerant constructed wetland system.

[0019] Figure 5 This is a partial schematic diagram of a salt-resistant sandy filler layer.

[0020] Figure 6 This is a partial schematic diagram of the salt-tolerant microbial immobilization carrier layer.

[0021] Figure 7 This is a partial schematic diagram of the coupled temperature control device.

[0022] Figure 8This is a schematic diagram of a magnetic biochar module.

[0023] Explanation of icon numbers

[0024] 1. Solar collector

[0025] 2 Geothermal collector

[0026] 3 Heat medium storage components

[0027] 4 Geothermal Circulation Pipes

[0028] 5 Solar collector tubes

[0029] 6. Two-way heat exchange valve

[0030] 7 Drive Pump

[0031] 8 Geothermal return pipes

[0032] 9. Solar return pipe

[0033] 10 Temperature Control Layer

[0034] 20 Salt-resistant sandy filler layer

[0035] 30 Salt-tolerant microbial immobilization carrier layers

[0036] 40 Salt-tolerant plant planting layer

[0037] 50 layers of waterproof material

[0038] 21 Corrugated deflector

[0039] 22. Bottom layer

[0040] 23 Middle Management

[0041] 24 Top Floor

[0042] 31 Magnetic Biochar Module

[0043] 41 Salt-tolerant plants

[0044] 61 Water inlet pipe

[0045] 62 Inlet Canal

[0046] 71 Water outlet pipe

[0047] 72. Drainage Channel

[0048] 100 Filler Tank

[0049] 311 Honeycomb-shaped through holes Detailed Implementation

[0050] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] Please see the appendix Figures 1-6 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0053] like Figure 1 and Figure 5 As shown, this utility model embodiment provides a coupled temperature control device, including a solar energy component and a geothermal component. The solar energy component includes a solar collector 1, a heat medium storage component 3, and a solar collector tube 5 connected in sequence. The heat medium storage component 3 is adapted to store the heat energy collected by the solar collector 1 and is adapted to transfer the heat energy to the solar collector tube 5 through a drive pump 7. The geothermal component includes a geothermal collector 2, a conversion distributor, and a geothermal circulation pipe 4 connected in sequence. The geothermal collector 2 is adapted to transfer the collected geothermal energy to the geothermal circulation pipe 4 through the conversion distributor. The solar collector tube 5 is laid above the geothermal circulation pipe 4, and the geothermal circulation pipe 4 and the solar collector tube 5 are connected by a bidirectional heat exchange valve 6.

[0054] In this invention, the term "above" in "the solar collector pipe 5 is laid above the geothermal circulation pipe 4" means that after the geothermal circulation pipe 4 is laid in a plane, the solar collector pipe 5 is laid above its horizontal plane.

[0055] In a preferred embodiment, such as Figure 5As shown, the solar collector tube 5 is located 10-20cm, 10-12cm, 12-14cm, 14-16cm, 16-18cm or 18-20cm above the geothermal circulation tube 4.

[0056] In a preferred embodiment, such as Figure 1 As shown, both the geothermal circulation pipe 4 and the solar collector pipe 5 are laid in an S-shape, and the laying direction of the solar collector pipe 5 is perpendicular to that of the geothermal circulation pipe 4.

[0057] In a preferred embodiment, the geothermal circulation pipe 4 is also connected to the geothermal return pipe 8, which is connected to the conversion distributor 8.

[0058] In a preferred embodiment, the solar collector tube 5 is also connected to the solar return tube 9, which is connected to the drive pump 7.

[0059] In a preferred embodiment, temperature sensors are respectively installed at the inlet and outlet ends of the solar collector tube 5. Data detected by the sensors can be wirelessly fed back to a cloud platform or a mobile app. Based on the data, the flow rate of the geothermal circulation pipe 4 or the solar collector tube 5 can be adjusted to control the temperature.

[0060] like Figure 2 As shown, this utility model embodiment also provides a salt-tolerant constructed wetland system. The system includes an inlet channel, a filler tank 100, and an outlet channel connected in sequence. The filler tank 100 includes a tank body with four sides and a bottom, and a filler structure inside the tank body. The filler structure is a multi-layer composite structure, consisting of a temperature control layer 10, a salt-tolerant sand filler layer 20, a salt-tolerant microbial immobilization carrier layer 30, and a salt-tolerant plant planting layer 40 from bottom to top. The temperature control layer 10 includes a geothermal circulation pipe 4 and a solar collector pipe 5, which are coupled to a temperature control device as described above and buried in quartz sand. Layer 10 is suitable for auxiliary heating of the wetland system; the salt-tolerant sandy filler layer 20 is divided into three layers from bottom to top in order of filler particle size from large to small, and corrugated guide plates 21 are provided between each layer; the salt-tolerant microbial immobilization carrier layer 30 is formed by stacking carriers that embed salt-tolerant microorganisms, and magnetic biochar modules 31 are also embedded therein; salt-tolerant plants 41 are also planted on the salt-tolerant plant planting layer 40; the water inlet channel is connected to the filler pool through an opening at the upper end of the side pool body of the filler pool, and the water outlet channel is connected to the filler pool through an opening at the lower end of the side pool body of the filler pool.

[0061] In this invention, the geothermal circulation pipe 4 and solar collector pipe 5 buried in the temperature control layer 10 can also be replaced by other existing technologies that can achieve temperature control, which can provide auxiliary heating for the wetland system in winter.

[0062] This invention relates to a salt-tolerant constructed wetland system. A geothermal circulation pipe 4 is buried at the bottom of the wetland to enhance its treatment efficiency using geothermal energy. A solar collector pipe 5 is laid parallel above the geothermal circulation pipe 4, and the two are connected by a bidirectional heat exchange valve 6. In winter, a solar-assisted heating mode is activated to overcome the problem of wetland functional failure during winter, helping to ensure the wetland maintains its purification effect even in cold winter conditions.

[0063] In a preferred embodiment, the perimeter and bottom of the filling tank are lined with an impermeable material layer 50 to prevent sewage leakage from polluting the surrounding soil and groundwater. More preferably, the wetland tank is constructed using a concrete structure.

[0064] In a preferred embodiment, such as Figure 2 As shown, the thickness of the temperature control layer 10 is 20-30 cm. For example, it is 20 cm, 22 cm, 24 cm, 26 cm, 28 cm or 30 cm.

[0065] In a preferred embodiment, the salt-resistant sandy packing layer 20 is filled with quartz sand with a particle size of 2-5 mm, 2-3 mm, 3-4 mm, or 4-5 mm. Quartz sand, with its excellent chemical stability and superior filtration performance, can effectively trap suspended particles and colloidal substances in wastewater. Quartz sand can also be partially or completely replaced with sea sand, which is rich in various trace elements and exhibits good buffering and adsorption capacity for salt. Both methods can significantly improve salt filtration and adsorption efficiency.

[0066] In a preferred embodiment, such as Figure 3 As shown, the particle sizes of the three layers of the salt-resistant sandy filler layer 20 from bottom to top are as follows: the filler particle size of the bottom layer 22 is 6-10 mm, such as 6 mm, 7 mm, 8 mm, 9 mm or 10 mm; the filler particle size of the middle layer 23 is 4-6 mm, such as 4 mm, 5 mm or 6 mm; and the filler particle size of the top layer 24 is 2-4 mm, such as 2 mm, 3 mm or 4 mm. More preferably, the thicknesses of the bottom layer 22, the middle layer 23 and the top layer 24 are the same. This utility model adds a vertical gradient structure to the salt-resistant sandy filler layer 20, arranging the filler in layers according to particle size (bottom layer 6-10 mm → middle layer 4-6 mm → top layer 2-4 mm), forming a filtration gradient with a denser top and a looser bottom.

[0067] In a preferred embodiment, such as Figure 2 As shown, the thickness of the salt-resistant sand filler layer 20 is 40–60 cm. For example, it is 40 cm, 45 cm, 50 cm, 55 cm, or 60 cm.

[0068] In a preferred embodiment, such as Figure 3As shown, the corrugated guide plate 21 has an inclination angle of 15–20°. For example, it can be 15°, 16°, 17°, 18°, 19°, or 20°. The corrugated guide plates 21 arranged between each layer extend the water flow path. Combined with the vertical gradient structure in the salt-resistant sand filler layer 20, the suspended solids interception efficiency can be enhanced, while preventing the filler layer from caking.

[0069] In a preferred embodiment, the carrier encapsulating salt-tolerant microorganisms is granular with a particle size of 4–8 mm and a bulk density of 0.8–1.0 g / cm³. 3 The immobilized salt-tolerant microorganisms are evenly distributed in the carrier, forming highly efficient biological processing micro-units.

[0070] The carrier is sodium alginate. Sodium alginate has good biocompatibility and gel properties. Using sodium alginate as an embedding matrix, salt-tolerant microorganisms that have undergone rigorous screening and domestication can be effectively immobilized, providing them with a stable living environment while maintaining their activity.

[0071] The salt-tolerant microorganisms are selected from one or more of halophilic bacteria and salt-tolerant algae. Other salt-tolerant microorganisms may also be used.

[0072] In a preferred embodiment, such as Figure 2 As shown, the thickness of the salt-tolerant microbial immobilization carrier layer 30 is 30–40 cm. For example, it is 30 cm, 32 cm, 34 cm, 36 cm, 38 cm, or 40 cm.

[0073] In a preferred embodiment, such as Figure 6 As shown, the surface of the magnetic biochar module 31 is provided with honeycomb-shaped through holes 311, with a hole diameter of 2 to 4 mm. For example, 2 mm, 3 mm or 4 mm.

[0074] In a preferred embodiment, the magnetic biochar module 31 has a core-shell structure, with an outer layer of Fe3O4 modified biochar and calcium alginate composite matrix, and an inner layer filled with sulfur / limestone composite filler. In this invention, the magnetic biochar module 31 employs a double-embedding technology of Fe3O4 modified biochar and calcium alginate, with a honeycomb-like perforated surface and an inner layer filled with sulfur / limestone composite filler, achieving simultaneous denitrification, phosphorus removal, and heavy metal adsorption. The mass ratio of sulfur to limestone is 1:4 to 1:3, and the mass ratio of Fe3O4 modified biochar to calcium alginate is 1:1 to 1:2.

[0075] In a preferred embodiment, such as Figure 4 As shown, the magnetic biochar module 31 has dimensions of 8–12 cm × 8–12 cm × 4–6 cm. More preferably, the magnetic biochar module 31 has dimensions of 10 cm × 10 cm × 5 cm.

[0076] In a preferred embodiment, such as Figure 4 As shown, the spacing between the magnetic biochar modules 31 in the salt-tolerant microbial immobilization carrier layer 30 is 20–40 cm. For example, it can be 20 cm, 25 cm, 30 cm, 35 cm, or 40 cm.

[0077] In a preferred embodiment, the salt-tolerant plant planting layer 40 is further filled with coconut shell biochar and expanded clay pebbles in the plant root zone. The ratio of coconut shell biochar to expanded clay pebbles is 1:2.

[0078] The particle size of the expanded clay aggregate is 8–12 mm.

[0079] The coconut shell biochar prepared by using iron-modified coconut shell biochar specifically involves treating the biochar with ferric chloride as the iron source at a concentration of 0.1–0.5 mol / L, a treatment time of 12–24 h, and a temperature of 80–100 °C. The prepared biochar exhibits strong magnetic properties.

[0080] In a preferred embodiment, such as Figure 2 As shown, the thickness of the salt-tolerant plant planting layer 40 is 10–20 cm. For example, it is 10 cm, 12 cm, 14 cm, 16 cm, 18 cm, or 20 cm.

[0081] In a preferred embodiment, the salt-tolerant plant 41 is selected from one or more of reeds, Suaeda salsa, and Curcuma longa. The salt-tolerant plant planting layer 40 is planted with highly salt-tolerant plant varieties that possess special physiological structures and salt-tolerance mechanisms, enabling them to grow normally in saline environments and play a role in purifying wastewater. The plant roots effectively remove wastewater pollutants through absorption, adsorption, and transformation functions, while simultaneously supplying oxygen and organic carbon sources to microorganisms, accelerating their growth and metabolism.

[0082] During the planting process, the planting density and spacing are scientifically controlled based on the unique growth habits and ecological needs of the plants. Preferably, the salt-tolerant plant 41 is Suaeda salsa, and the planting density is 20-30 plants / m². 2 Preferably, the salt-tolerant plant 41 is *Scirpus triqueter*, with a plant spacing of 30–40 cm.

[0083] In a preferred embodiment, the water inlet channel includes a water inlet pipe 61 and a water inlet channel 62. The water inlet pipe 61 is adapted to draw water into the water inlet channel 62, and the water inlet channel 62 is connected to the packing pool through an opening at the upper end of the side body of the packing pool.

[0084] In a preferred embodiment, the water outlet channel includes a water outlet pipe 71 and a water outlet channel 72. The water outlet pipe 71 is adapted to discharge water from the water outlet channel 72. The water outlet channel 72 is connected to the packing pool through an opening at the lower end of the side body of the packing pool.

[0085] In a preferred embodiment, the salt-tolerant constructed wetland system is further provided with a geothermal collector 2, a conversion distributor, and a geothermal return pipe 8. The geothermal collector 2 is adapted to provide heat energy to the geothermal circulation pipe 4 through the conversion distributor, and the geothermal return pipe 8 is connected to the conversion distributor and the geothermal circulation pipe 4 respectively.

[0086] In a preferred embodiment, the salt-tolerant constructed wetland system is further provided with a solar collector 1, a heat medium storage component 3, and a solar return pipe 9 connected externally. The heat medium storage component 3 is adapted to transfer heat energy to the solar collector pipe 5 through a drive pump 7. The solar return pipe 9 is connected to the drive pump 7 and the solar collector pipe 5 respectively.

[0087] Construction of Salt-Tolerant Constructed Wetland Systems

[0088] Choose a flat, well-drained site for the artificial wetland construction. The site must be leveled and compacted to ensure a stable foundation and adequate load-bearing capacity. According to design requirements, excavate a 100mm wetland filler pool. Lay a 50mm layer of impermeable material on the bottom and four walls of the pool, and construct the wetland pool using a concrete structure.

[0089] Installation of the solar-geothermal coupling temperature control device: Geothermal circulation pipe 4 and solar collector pipe 5 are buried at the bottom of the filling tank 100. The geothermal circulation pipe 4 is constructed of HDPE geothermal pipe (100mm in diameter) and laid on the impermeable layer of the wetland bed at a spacing of 0.8m. Operating parameters: circulating water temperature of geothermal circulation pipe 4 is 40~45℃, and evaporation efficiency is ≥50L / (m³). 2 •d); A parallel solar collector pipe 5 (copper-aluminum composite heat pipe, 50mm diameter, 20cm spacing) is laid 10cm above the geothermal circulation pipe 4, and the two are connected by a two-way heat exchange valve 6. In winter, the solar-assisted heating mode is activated. Quartz sand is filled around and between the geothermal circulation pipe and the solar collector pipe to facilitate heat conduction. The system is externally equipped with a solar collector 1, a geothermal collector 2, a heat medium storage component 3 (such as an insulated water tank), a drive pump 7, a converter / distributor, a geothermal return pipe 8, and a solar return pipe 9. A temperature sensor is also provided for more precise temperature control.

[0090] Filler and carrier laying: A salt-tolerant sandy filler layer 20, a salt-tolerant microbial immobilization carrier layer 30, and a salt-tolerant plant planting layer 40 are evenly laid on top of the solar-geothermal coupling temperature control device. A layered compaction method is used during laying to ensure the density and uniformity of the filler layers. The thickness of the temperature control layer 10 is 20-30cm; the thickness of the salt-tolerant sandy filler layer 20 is 40-60cm; the thickness of the salt-tolerant microbial immobilization carrier layer 30 is 30-40cm; and the thickness of the salt-tolerant plant planting layer 40 is 10-20cm. After laying, the flatness must be checked (flatness should meet the construction project quality acceptance standards, with no protrusions or depressions, and the surface flatness deviation should not exceed 0.01m). Only after passing the test can the next layer be laid.

[0091] Planting and Maintenance: Plant 40 layers of salt-tolerant plants above the 40-layer salt-tolerant plant layer according to the design plan. Carefully protect the plant roots during planting to prevent damage. After planting, water thoroughly and cover with a thin layer of soil, keeping the soil moist. During the plant's growth, regularly perform fertilization, watering, and pest and disease control to ensure healthy growth and maximize the plants' purifying effect.

[0092] System Operation and Management: In the initial stage of system operation, control the influent flow rate and gradually increase the system load. Closely monitor key parameters such as influent and effluent water quality, water level, and dissolved oxygen. Adjust core operating parameters such as the circulating water ratio and hydraulic retention time flexibly based on monitoring data. Regularly maintain the system, including cleaning debris from the tank surface, inspecting and replacing damaged equipment parts, and replenishing salt-tolerant microorganisms (preparing salt-tolerant microbial agents into a suspension and adding it to the influent channel; the agent enters the packing tank through the opening at the top of the side of the packing tank with the influent and evenly penetrates the packing layer) and plants. Simultaneously, establish comprehensive operation management records to document system operation and maintenance, providing a basis for system optimization and improvement, and ensuring long-term stable system operation.

[0093] In summary, the salt-tolerant constructed wetland system of this invention alleviates salt stress through salt-tolerant plants 41, embeds magnetic biochar modules 31 into the salt-tolerant microbial immobilization carrier layer 30, and further enhances the denitrification, phosphorus removal, and heavy metal adsorption capacity of the magnetic biochar modules 31 using double-embedding technology, adds a vertical gradient structure to the salt-tolerant sandy filler layer 20 to form a filtration gradient with a denser top and a sparser bottom, and combines this with the setting of corrugated guide plates 21 to extend the water flow path, enhance the suspended solids interception efficiency, and at the same time prevent the salt-tolerant sandy filler layer 20 from caking; it also combines solar and geothermal synergistic technology to maintain the temperature of the wetland system using solar and geothermal energy, overcomes the problem of wetland functional failure in winter, and helps to ensure that the wetland still has a purification effect under cold winter conditions.

[0094] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0095] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A coupled temperature control device, characterized in that, The system includes a solar panel and a geothermal panel. The solar panel includes a solar collector (1), a heat medium storage component (3), and a solar collector tube (5) connected in sequence. The heat medium storage component (3) is adapted to store the heat energy collected by the solar collector (1) and is adapted to transfer the heat energy to the solar collector tube (5) by driving a pump (7). The geothermal panel includes a geothermal collector (2), a converter and distributor, and a geothermal circulation pipe (4) connected in sequence. The geothermal collector (2) is adapted to transfer the collected geothermal energy to the geothermal circulation pipe (4) through the converter and distributor. The solar collector tube (5) is laid above the geothermal circulation pipe (4) and the geothermal circulation pipe (4) is connected to the solar collector tube (5) by a two-way heat exchange valve (6).

2. The coupled temperature control device as described in claim 1, characterized in that, The solar collector tube (5) is located 10-20cm above the geothermal circulation tube (4); And / or, the geothermal circulation pipe (4) and the solar collector pipe (5) are both laid in an S-shape, and the laying direction of the solar collector pipe (5) is perpendicular to that of the geothermal circulation pipe (4); And / or, the geothermal circulation pipe (4) is also connected to the geothermal return pipe (8), which is connected to the conversion distributor; And / or, the solar collector tube (5) is also connected to the solar return tube (9), which is connected to the drive pump (7); And / or, the inlet and outlet ends of the solar collector tube (5) are respectively equipped with temperature sensors.

3. A salt-tolerant constructed wetland system, characterized in that, The system includes an inlet channel, a filler tank (100), and an outlet channel connected in sequence. The filler tank (100) includes a tank body with four sides and a bottom, as well as a filler structure inside the tank body. The filler structure is a multi-layer composite structure, consisting of a temperature control layer (10), a salt-tolerant sand filler layer (20), a salt-tolerant microbial immobilization carrier layer (30), and a salt-tolerant plant planting layer (40) from bottom to top. The temperature control layer (10) includes a geothermal circulation pipe (4) and a solar collector pipe (5) of the coupled temperature control device as described in any one of claims 1 to 2, which are buried in quartz sand. The temperature control layer (10) is suitable for auxiliary heating of the wetland system. The salt-tolerant sandy filler layer (20) is divided into three layers from bottom to top in order of decreasing filler particle size, and corrugated guide plates (21) are provided between each layer; the salt-tolerant microbial immobilization carrier layer (30) is formed by stacking carriers containing salt-tolerant microorganisms, and magnetic biochar modules (31) are also embedded therein; salt-tolerant plants (41) are also planted on the salt-tolerant plant planting layer (40); the water inlet channel is connected to the filler pool (100) through the opening at the upper end of the side pool body of the filler pool (100), and the water outlet channel is connected to the filler pool (100) through the opening at the lower end of the side pool body of the filler pool (100).

4. The salt-tolerant constructed wetland system as described in claim 3, characterized in that, The filling pool is covered with a layer of impermeable material (50) around its perimeter and bottom. And / or, the thickness of the temperature control layer (10) is 20-30 cm.

5. The salt-tolerant constructed wetland system as described in claim 3, characterized in that, The filler in the salt-resistant sandy filler layer (20) is quartz sand with a particle size of 2-5 mm; And / or, the particle size of the three layers of the salt-resistant sand filler layer (20) from bottom to top is as follows: the filler particle size of the bottom layer (22) is 6-10 mm, the filler particle size of the middle layer (23) is 4-6 mm, and the filler particle size of the top layer (24) is 2-4 mm. And / or, in terms of the horizontal plane, the corrugated guide vane (21) has an inclination angle of 15 to 20°; And / or, the thickness of the salt-resistant sand filler layer (20) is 40-60 cm.

6. The salt-tolerant constructed wetland system as described in claim 3, characterized in that, The carrier containing salt-tolerant microorganisms is granular, with a particle size of 4–8 mm and a bulk density of 0.8–1.0 g / cm³. 3 ; And / or, the carrier is sodium alginate; And / or, the salt-tolerant microorganisms are selected from one or more of halophilic bacteria and halophilic algae; And / or, the thickness of the salt-tolerant microbial immobilization carrier layer (30) is 30-40 cm; And / or, the surface of the magnetic biochar module (31) is provided with honeycomb-shaped through holes (311) with a pore diameter of 2 to 4 mm; And / or, the magnetic biochar module (31) has a core-shell structure, with the outer layer being a composite matrix of Fe3O4 modified biochar and calcium alginate, and the interior being filled with sulfur / limestone composite filler. And / or, the magnetic biochar module (31) has a size of 8-12cm × 8-12cm × 4-6cm; And / or, the spacing between the magnetic biochar modules (31) in the salt-tolerant microbial immobilization carrier layer (30) is 20-40 cm.

7. The salt-tolerant constructed wetland system as described in claim 3, characterized in that, The salt-tolerant plant planting layer (40) is also filled with coconut shell biochar and / or ceramsite in the plant root zone; And / or, the thickness of the salt-tolerant plant planting layer (40) is 10-20 cm.

8. The salt-tolerant constructed wetland system as described in claim 3, characterized in that, The salt-tolerant plant (41) is selected from one or more of reeds, Suaeda salsa, and Scutellaria barbata.

9. The salt-tolerant constructed wetland system as described in claim 8, characterized in that, The salt-tolerant plant (41) is Suaeda salsa, with a planting density of 20-30 plants / m². 2 ; And / or, the salt-tolerant plant (41) is *Scirpus triqueter*, with a plant spacing of 30-40 cm.

10. The salt-tolerant constructed wetland system as described in claim 3, characterized in that, The water inlet channel includes an inlet pipe (61) and an inlet channel (62). The inlet pipe (61) is adapted to draw water into the inlet channel (62). The inlet channel (62) is connected to the packing pool through an opening at the upper end of the side body of the packing pool. And / or, the water outlet channel includes a water outlet pipe (71) and a water outlet channel (72), the water outlet pipe (71) is adapted to discharge water from the water outlet channel (72), and the water outlet channel (72) is connected to the packing pool through an opening at the lower end of the side body of the packing pool; And / or, the geothermal circulation pipe (4) and the solar collector pipe (5) are connected by a two-way heat exchange valve (6); And / or, the exterior of the salt-tolerant constructed wetland system is also provided with a geothermal collector (2), a conversion distributor and a geothermal return pipe (8), the geothermal collector (2) is adapted to provide heat energy to the geothermal circulation pipe (4) through the conversion distributor, and the geothermal return pipe (8) is connected to the conversion distributor and the geothermal circulation pipe (4) respectively; And / or, the salt-tolerant constructed wetland system is also provided with a connected solar collector (1), a heat medium storage component (3) and a solar return pipe (9). The heat medium storage component (3) is adapted to transfer heat energy to the solar collector pipe (5) through a drive pump (7). The solar return pipe (9) is connected to the drive pump (7) and the solar collector pipe (5) respectively.

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