Terrestrial-aquatic plant composite floating wetland and application thereof

Abstract

The application provides a terrestrial-aquatic plant composite floating wetland and application thereof, and realizes up and down floating actions of a substrate tank. The intermittent immersion of the terrestrial plant root system in water is realized through the floating actions, a suitable environment for the terrestrial plant is created, and the growth discomfort, poor growth and death of the terrestrial plant caused by long-time immersion in water are avoided. The reoxygenation efficiency of the subsurface wetland is improved through the floating actions, and the packing is cleaned to avoid packing blockage. The wetland also constructs a submerged-emersed-terrestrial plant transition buffer type ecological community, improves the stability of the ecological system, fully guarantees the winter treatment effect of the wetland, and improves the plant and landscape diversity. The wastewater is subjected to rapid oxidation, complexation and precipitation secondary and tertiary treatments through gas and wastewater into a mixing box, a water treatment mechanism and a T-shaped overflow sludge discharge device. Finally, the effluent from the mixing reaction box is subjected to further deep treatment through the terrestrial-aquatic composite vertical subsurface wetland.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ecological restoration, in particular to a terrestrial-aquatic plant composite floating wetland and application thereof. BACKGROUND

[0002] Plants are an important part of the constructed wetland system, and the aquatic plants currently widely used in the constructed wetland are mostly perennial herbs. China is in the subtropical zone, and the aboveground parts of the perennial herbs will gradually wither and die in winter, resulting in the natural withering and death of the perennial herbs and the problems of unstable water quality treatment effect and poor landscape effect of the constructed wetland system in winter. The stability of the treatment effect of the constructed wetland system is the key to the constructed wetland technology and the difficulty in large-scale popularization and operation of the constructed wetland in the subtropical zone.

[0003] Terrestrial plants, especially terrestrial woody plants, have a large root biomass and a higher purification potential. Currently, there are few reports on the hydroponics of terrestrial plants and the application of the terrestrial plants in the constructed wetland and ecological floating island. Related studies show that the direct hydroponics of the terrestrial plants is prone to poor growth, black roots and rotten roots. Related studies point out that the difference between the root system of the terrestrial plants and the root system of the aquatic plants is that the root of the aquatic plants can transport the oxygen absorbed from the leaves to the root through the air cavity formed by the intercellular space of the epidermis and endothelium or the developed transport tissue in the cortex. The supply of the terrestrial plants is generally small, so the terrestrial plants cannot play their biomass advantage in the waterlogged and anoxic environment, and are prone to dwarf, black roots, rotten roots and death. In particular, the root of the terrestrial plants will not develop root hairs if it only absorbs the dissolved oxygen in the water, which is not conducive to the absorption of nutrients. SUMMARY

[0004] Therefore, the present application aims to provide a terrestrial-aquatic plant composite floating wetland and application thereof to solve the above problems.

[0005] To achieve the above object, the technical scheme of the present application is as follows:

[0006] A terrestrial-aquatic plant composite floating wetland, comprising:

[0007] A substrate tank containing fillers and substrates for planting terrestrial plants and emergent plants, which is the subsurface flow wetland part of the system. A support net plate is horizontally arranged in the substrate tank, and the support net plate and the bottom of the substrate tank form a cavity. The bottom of the substrate tank is provided with a through hole, or the material of the substrate tank is a water-permeable material. An iron particle layer and a carbon particle layer are sequentially arranged on the inner side wall of the substrate tank from the outside to the inside. Planting substrates are further arranged in the space above the support net plate, and the planting substrates are planted with terrestrial plants and emergent plants.

[0008] A driving mechanism is connected with the substrate tank and used to drive the substrate tank to float up and down in water, so that the bottom of the substrate tank is intermittently submerged in water, and because the bottom of the substrate tank has a through hole or a water-permeable material, water can enter the substrate tank intermittently, avoiding the roots of terrestrial plants being always submerged in water.

[0009] A mixing box is located at one side of the substrate tank, and the driving mechanism is installed on the mixing box, and the mixing box floats on water. The mixing box is open at the top and the bottom, and two upper and lower baffles are arranged in the mixing box. The mixing box is divided into an air inlet chamber, a mixing chamber and a water inlet chamber from top to bottom. The air inlet chamber is provided with an air inlet pipe, the mixing chamber is provided with a water outlet pipe, and the water inlet chamber is provided with a water inlet pipe. The upper and lower baffles are provided with one-way check valves. The air inlet chamber is provided with an upper piston, and the water inlet chamber is provided with a lower piston. The mixing box is provided with an adjusting mechanism for driving the upper piston and the lower piston to move up and down. The upper piston and the lower piston move up and down to draw gas and water into the air inlet chamber and the water inlet chamber respectively, and then the water and the gas enter the mixing chamber through the check valves for mixing. The mixed water and gas are discharged through the water outlet pipe.

[0010] A water treatment mechanism is used to treat the water discharged from the water outlet pipe. The water outlet pipe is connected to the middle part of the water treatment mechanism. The lower part of the water treatment mechanism is provided with a spiral sludge discharge pipe, and the upper part of the water treatment mechanism is provided with a filter screen. The water treatment mechanism is provided with a water discharge pipe above the filter screen. The water discharge pipe discharges water into the substrate tank, and the water outlet is located above the iron particle layer and the carbon particle layer.

[0011] Further, the substrate tank is two, and a space is left between the two substrate tanks and a submerged plant planting net box is arranged. The mixing boxes are arranged outside the two substrate tanks, and the two mixing boxes are connected by a connecting rail. The driving mechanism is arranged on the connecting rail.

[0012] Further, the driving mechanism comprises a first rotation-stopping yoke, a chain wheel, a driving wheel and a chain. The first rotation-stopping yoke is installed on the connecting rail, and the substrate tank is connected with the first rotation-stopping yoke. The first rotation-stopping yoke is further fixedly connected with the chain wheel. The mixing box is rotatably provided with the driving wheel. The driving wheel and the chain wheel are drivingly connected by the chain. The driving wheel is driven to rotate by a motor. The driving wheel drives the first rotation-stopping yoke to rotate, thereby driving the substrate tank to float up and down.

[0013] Further, the first rotation-stopping yoke comprises a rotating wheel, a guide ring, a fixed rod and a guide rod. The rotating wheel is rotatably installed on the connecting rail. The fixed rod is vertically fixed at the edge of the rotating wheel. The guide ring is sleeved on the fixed rod. The guide ring is long circular. The length of the guide ring extends in the horizontal direction. The guide ring is fixed with the guide rod above and below. The upper end and the lower end of the guide rod are fixed with the support rod. The upper part and the lower part of the substrate tank are fixed on the upper and lower support rods by steel wires respectively.

[0014] Further, the first rotation-stopping yoke is installed on the connecting rail through a fixing sheet, the connecting rail is 2 groups and symmetrically arranged on two sides of the mixing box, each group of the connecting rail is 2 rods and arranged up and down, and the rotating wheel is located between the two connecting rails; the outer periphery of the rotating wheel is provided with an annular groove, and the two connecting rods are clamped in the annular groove to limit the rotating wheel.

[0015] Further, the adjusting mechanism comprises a second rotation-stopping yoke, the structure of the second rotation-stopping yoke is same as that of the first rotation-stopping yoke, the two guide rods of the second rotation-stopping yoke are connected with the upper piston and the lower piston respectively, and the second rotation-stopping yoke is driven to rotate by the motor.

[0016] Further, the mixing box is further provided with a solar panel and a storage battery, the solar panel is connected with the storage battery, and the storage battery is connected with the motor.

[0017] Further, a gap is left between the spiral flow sludge discharge pipe and the side wall of the water treatment mechanism to form a backflow channel, the lower part of the water treatment mechanism is provided with a backflow pipe in communication with the backflow channel, and the upper part of the water treatment mechanism is provided with a blowing pipe in communication with the drain pipe.

[0018] The application further provides application of the terrestrial-aquatic plant composite floating wetland in purifying water quality of a wetland system, when the floating wetland is used for water treatment, first, sewage is naturally precipitated, then the mixing box inlet pipe is located in the underwater section of the floating wetland, the huge number of plant root systems and the biofilm microorganisms distributed in this section form a biological contact oxidation reaction zone for the sewage, when the lower piston plate of the mixing box continuously lifts the water, the whole substrate tank is floated up and down, and the cavity below the substrate tank is connected to the contact oxidation area to aerate and reoxygenate the contact oxidation area, so that primary and secondary sewage treatment is completed; the mixing box and the water treatment mechanism rapidly oxidize, complex and precipitate the sewage, so that secondary and tertiary sewage treatment is completed; and the mixed reaction box outlet water is further deeply treated through the terrestrial-aquatic plant composite vertical subsurface flow wetland.

[0019] Compared with the prior art, the terrestrial-aquatic plant composite floating wetland and the application thereof have the following advantages:

[0020] 1. The floating wetland of the application realizes the up-and-down floating action of the substrate tank, the terrestrial plant root systems are intermittently immersed in water through the floating action, a suitable environment for the terrestrial plants is created, and the problems of growth discomfort, ill health and death of the terrestrial plants caused by long-time immersion in water are avoided; the subsurface flow wetland reoxygenation efficiency is improved through the floating action, and the filler is cleaned to avoid filler blockage.

[0021] 2. The substrate tank of the floating wetland of the application is not physically divided, the plant root systems are secreted and interacted, the side box body and the guide rail structure ensure the buoyancy of the floating block and greatly improve the strength, rigidity and stability of the floating block, light fillers are used, the hollow structure is used, the thickness of the chemical fiber is reduced, and the plant root distribution and penetration efficiency are improved.

[0022] 3. The floating wetland of the present application constructs a submerged-emersed-terrestrial plant transition buffer type ecological community, improves the stability of the ecological system, and fully guarantees the winter treatment effect of the wetland, plant and landscape diversity.

[0023] 4. The floating wetland of the present application increases the hydraulic retention time of the system, improves the treatment load, and realizes multi-stage treatment of sewage. The treatment process includes primary and secondary treatment of the influent of the mixed reaction tank by a large number of plant root microorganisms distributed underwater through the substrate tank and floating aeration reoxygenation contact oxidation of the sewage on the whole substrate tank; continuous air and sewage pressing into the mixed tank, rapid oxidation, complexation and precipitation of the sewage by the water treatment mechanism of multiple aeration reaction and its filtration, overflow and sludge discharge for secondary and tertiary treatment; finally, deep treatment of the effluent of the mixed reaction tank by the terrestrial-aquatic composite vertical subsurface flow wetland. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and the illustrative embodiments of the present application and their description serve the purpose of explaining the present application. The present application is not limited by the improper limitation of the accompanying drawings. In the drawings:

[0025] Figure 1 It is a structural schematic diagram of the terrestrial-aquatic plant composite floating wetland;

[0026] Figure 2 It is a partial enlarged view of A of the terrestrial-aquatic plant composite floating wetland;

[0027] Figure 3 It is a partial enlarged view of B of the terrestrial-aquatic plant composite floating wetland;

[0028] Figure 4 It is a side view of the terrestrial-aquatic plant composite floating wetland;

[0029] Figure 5 It is a structural schematic diagram of the substrate tank;

[0030] Figure 6 It is an internal structure diagram of the mixed tank;

[0031] Figure 7 It is a structural schematic diagram of the water treatment mechanism;

[0032] Figure 8 It is a water flow schematic diagram of the terrestrial-aquatic plant composite floating wetland.

[0033] Explanation of reference signs:

[0034] 1, matrix groove; 11, support net plate; 12, iron particle layer; 13, carbon particle layer; 14, plant; 2, support rod; 3, steel wire; 4, driving mechanism; 41, first rotation-stopping yoke; 411, rotating wheel; 412, guide ring; 413, fixing rod; 414, guide rod; 42, fixing sheet; 43, chain wheel; 44, driving wheel; 45, chain; 5, mixing box; 51, air inlet pipe; 52, water inlet pipe; 53, water outlet pipe; 54, lower partition plate; 55, upper partition plate; 56, second rotation-stopping yoke; 57, upper piston; 58, lower piston; 59, check valve; 6, water treatment mechanism; 61, connecting pipe; 62, spiral sludge discharge pipe; 63, outlet; 64, filter screen; 65, drain pipe; 66, air blowing pipe; 67, backflow channel; 68, backflow pipe; 7, connecting rail. DETAILED DESCRIPTION

[0035] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0037] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0039] A terrestrial-aquatic plant composite floating wetland, comprising:

[0040] The substrate tank 1 is used for planting terrestrial plants and emergent plants, and a horizontal support net plate 11 is arranged in the substrate tank 1, the support net plate 11 and the bottom of the substrate tank 1 form a cavity, the bottom of the substrate tank 1 is provided with a through hole or the material of the substrate tank 1 is a water permeable material, and an iron particle layer 12 and a carbon particle layer 13 are sequentially arranged on the inner side wall of the substrate tank 1 from the outside to the inside of the tank to form an iron-carbon composite filler, and a planting substrate is further arranged in the space above the support net plate 11, which is a subsurface flow constructed wetland filler area, and the planting substrate is planted with terrestrial plants and emergent plants; the thickness of the substrate tank is 30-50 cm, and the depth of the substrate filler is 20-40 cm; the iron powder and the carbon powder of the iron particle layer 12 and the carbon particle layer 13 are configured in a ratio of 4:1, and the porosity of the filler is greater than 60%; the filler is made of lightweight materials and is arranged in a graded reverse filtration, the upper layer is small-diameter lightweight fine sand (filtering layer, function: filtering the activated sludge in the mixed reaction box, intercepting dry branches and fallen leaves, and providing a carbon source required for microbial growth), the middle layer is graded small and medium-diameter lightweight ceramic particles (reverse filtration layer, function: preventing the lower filler from being blocked), and the lower layer is a nutrient substrate required for plant growth or the middle layer is an organic nutrient substrate and large-diameter lightweight ceramic particles (air permeable layer, function: continuously aerating and reoxygenating during the floating process to avoid oxygen deficiency of the plant root system); the terrestrial plants are selected from one or more of the following: Chinese hibiscus, Chinese hibiscus, small-leaf privet, oleander, gardenia, star anise, palm, French holly, boxwood, Chinese rose, hydrangea, and the aquatic plants are selected from one or more of the following: cattail, iris, reed, alligator weed, rush, water hyacinth, and pollution-tolerant water hyacinth; preferably, the quantity ratio of the aquatic plants to the terrestrial plants is 2:1-4:1; the root system of the aquatic plants can form a large amount of aeration tissues, and the oxygen in the air is transported to the root system through the above-ground leaves, and due to the difference in the oxidation-reduction potential of the root systems of the two plants, part of the oxygen and other oxidizing substances are transferred to the rhizosphere of the terrestrial plants, so as to promote the oxidation-reduction potential and the formation of the iron membrane in the rhizosphere of the terrestrial plants.

[0041] The driving mechanism 4 is connected with the substrate tank 1 and is used for driving the substrate tank 1 to float up and down in the water, so that the bottom of the substrate tank 1 is intermittently submerged in the water, and due to the through hole in the bottom of the substrate tank 1 or the water permeable material, water can intermittently enter the substrate tank 1, so that the root system of the terrestrial plants 14 is not always submerged in the water.

[0042] The mixing box 5 is located on one side of the substrate tank 1, and the driving mechanism 4 is installed on the mixing box 5, which floats on the water; the top and bottom of the mixing box 5 are open, and the mixing box 5 is provided with two upper and lower baffles 55 and 54, which divide the interior of the mixing box 5 into an air inlet chamber, a mixing chamber and a water inlet chamber from top to bottom in sequence, the air inlet chamber is provided with an air inlet pipe 51, the mixing chamber is provided with a water outlet pipe 53, and the water inlet chamber is provided with a water inlet pipe 52, the upper and lower baffles 55 and 54 are provided with one-way check valves 59, the air inlet chamber is provided with an upper piston 57, and the water inlet chamber is provided with a lower piston 58, the mixing box 5 is provided with an adjusting mechanism for driving the upper and lower pistons 57 and 58 to move up and down, the upper and lower pistons 57 and 58 move up and down to draw gas and water into the air inlet chamber and the water inlet chamber respectively, and then the water and the gas enter the mixing chamber through the check valves 59 for mixing, and the mixed water and gas are discharged through the water outlet pipe 53; the air inlet pipe and the water inlet pipe are also provided with check valves.

[0043] The water treatment mechanism 6 is used for treating the water discharged from the water outlet pipe 53, the water outlet pipe 53 is connected to the middle part of the water treatment mechanism 6, the lower part of the interior of the water treatment mechanism 6 is provided with a spiral sludge discharge pipe 62, the upper part of the water treatment mechanism 6 is provided with a filter screen 64, the water treatment mechanism 6 above the filter screen 64 is provided with a water discharge pipe 65, the water discharge pipe 65 discharges water into the substrate tank 1, and the water outlet is located above the iron particle layer 12 and the carbon particle layer 13.

[0044] Illustratively, the substrate tank 1 is 2, and the space between the two substrate tanks 1 is provided with a submerged plant planting net cage; the mixing box 5 is arranged outside the two substrate tanks 1 respectively, the two mixing boxes 5 are connected through the connecting rails 7 on both sides, and the driving mechanism 4 is arranged on the connecting rails 7.

[0045] Illustratively, the driving mechanism 4 includes a first rotation stopping yoke 41, a chain wheel 43, a driving wheel 44 and a chain 45, the first rotation stopping yoke 41 is installed on the connecting rail 7, the substrate tank 1 is connected with the first rotation stopping yoke 41, the chain wheel 43 is further fixedly connected on the first rotation stopping yoke 41, the driving wheel 44 is rotatably arranged on the mixing box 5, the driving wheel 44 and the chain wheel 43 are drivingly connected by the chain 45, the driving wheel 44 is driven to rotate by a motor, and the driving wheel 44 drives the first rotation stopping yoke 41 to rotate, thereby driving the substrate tank 1 to float up and down.

[0046] Specifically, the first rotation-stopping hinged 41 includes a rotating wheel 411, a guide ring 412, a fixed rod 413 and a guide rod 414, the rotating wheel 411 is rotatably installed on the connecting rail 7, the fixed rod 413 is vertically fixed on the edge of the rotating wheel 411, the guide ring 412 is sleeved on the fixed rod 413, the guide ring 412 is a long circle, the length of the guide ring 412 extends in the horizontal direction, the guide rods 414 are fixed on the upper and lower parts of the guide ring 412, the upper and lower ends of the guide rods 414 are fixed with the support rods 2, the upper and lower parts of the substrate tank 1 are fixed on the upper and lower support rods 2 through the steel wires 3. When the rotating wheel rotates, the fixed rod moves in the guide ring, thereby pushing the support rod to move up and down, and driving the substrate tank to float up and down, so that the intermittent immersion environment of the root system can be created.

[0047] More specifically, the first rotation-stopping hinged 41 is installed on the connecting rail 7 through the fixed sheet 42, the connecting rail 7 is 2 groups and symmetrically arranged on the two sides of the mixing box 5, each group of the connecting rail 7 is 2 rods and arranged in the upper and lower directions, and the rotating wheel 411 is located between the two connecting rails 7; the outer periphery of the rotating wheel 411 is provided with an annular groove, and the two connecting rods are clamped in the annular groove, thereby limiting the rotating wheel 411. 3-4 first rotation-stopping hinges can be arranged on each side of the substrate tank, and the stress is uniformly distributed.

[0048] Specifically, the adjusting mechanism includes a second rotation-stopping hinged 56, the structure of the second rotation-stopping hinged 56 is the same as that of the first rotation-stopping hinged 41, the two guide rods 414 of the second rotation-stopping hinged 56 are connected with the upper piston 57 and the lower piston 58 respectively, and the second rotation-stopping hinged 56 is driven to rotate by the motor. When the rotating wheel rotates, the guide rods drive the upper piston and the lower piston to move respectively, and specifically as shown in Figure 6 When the guide rods move downward, the lower piston moves downward, water is pumped into the water inlet chamber, and at the same time, the upper piston also moves downward, the gas in the air inlet chamber is pressed into the mixing chamber through the check valve, when the guide rods move upward, the lower piston moves upward, the water in the water inlet chamber is pressed into the mixing chamber through the check valve, and at the same time, the upper piston moves upward, air is pumped into the air inlet chamber; so repeatedly, when the pressure in the mixing chamber increases, water will be discharged from the water outlet pipe. Therefore, the reciprocating movement of the second rotation-stopping hinged and the upper and lower piston plates continuously press the air, sewage and purified water substances to make them fully react in the mixing reaction box and generate high-pressure water.

[0049] Specifically, the mixing box 5 is further provided with a solar panel and a storage battery, the solar panel is connected with the storage battery, and the storage battery is connected with the motor.

[0050] Exemplarily, the cyclone mud discharge pipe and the side wall of the water treatment mechanism 6 are further left with a gap to form a backflow channel 67, the lower part of the water treatment mechanism 6 is provided with a backflow pipe 68 which is communicated with the backflow channel 67; the upper part of the water treatment mechanism 6 is further provided with a blowing pipe 66 which is communicated with the water discharge pipe 65.

[0051] The water entering the water treatment mechanism first passes downward through the cyclone sludge discharge pipe, the sludge is discharged downward through the outlet, and the water is discharged upward through the screen from the drain pipe; the blowing pipe can reverse flush the filter screen.

[0052] When the floating wetland is used for water treatment, the sewage is first naturally precipitated, and then the water inlet pipe of the mixing box is located at the underwater section of the floating wetland. The huge number of plant roots and their biofilm microorganisms distributed in this part form a biological contact oxidation reaction zone for the sewage. When the lower piston plate of the mixing box continuously lifts the water, the entire substrate tank floats up and down, and the cavity below it aerates and reoxygenates the contact oxidation area, completing the primary and secondary treatment of the sewage. The mixing box and the water treatment mechanism rapidly oxidize, complex, and precipitate the sewage, completing the secondary and tertiary treatment of the sewage. The effluent from the mixing reaction box is further treated by the terrestrial-aquatic composite vertical subsurface wetland. In addition to the adsorption, absorption, and filtration of the wetland filler and the plants themselves, the purification of heavy metals and organic pollutants in the water also includes:

[0053] (1) The micro-electrolysis reaction between iron and carbon elements produces electrons and reducing substances Fe 2+ , which directly replace metal ions in water;

[0054] (2) Fe 2+ is continuously accumulated on the surface of plant roots under the influence of the redox potential of plant roots, oxidized to form an iron film, reducing the stress of heavy metal ions and enhancing the absorption of plant roots.

[0055] (3) Fe 3+ , O2, plant root microorganisms, and secretions enter the mixing reaction box for pressurized mixing, resulting in oxidation, complexation, and precipitation reactions (Fe(OH)3↓, etc.).

[0056] (4) The terrestrial, emergent, and submerged layers are configured in different plant layers, which have the effect of niche complementation. Aquatic (emergent and submerged) plants compensate for the insufficient oxygen secretion capacity of terrestrial plant roots, and terrestrial plants compensate for the insufficient root length and configuration of aquatic plants, increasing the specific surface area of biological contact oxidation and improving the purification efficiency of the wetland. At the same time, the depth of the purified water is increased.

[0057] Embodiment

[0058] A 5m x 2m x 0.5m substrate tank is constructed according to the above method, a 5m x 1m x 1m mixing chamber is symmetrically arranged, the terrestrial plant planting area is 5m x 1m, the emergent plant planting area is 5m x 1m, the substrate is mixed and configured with terrestrial and emergent plants, the terrestrial plants are selected from Hibiscus mutabilis, Nerium oleander, and Gardenia, the emergent plants are selected from Juncus effusus and Echinochloa crus-galli, and the submerged plants are selected from Vallisneria.

[0059] The system works, design the first rotation of the yoke pulley rotation 2r / h, wetland floating plants floating high difference is 25cm, one side of the mixing chamber water inflow is 2.5m 3 ((5m×1m×0.25m)×2), the total volume of the mixing chamber on both sides is 10m 3 (2×5m×m1×1m), the design of the mixing reaction average hydraulic retention time is 2h, the floating wetland volume is 5m 3 (5m×2m×0.5m), the water inflow is 10m 3 / h, the design of the hydraulic retention time is 0.5h.

[0060] The system is sampled in winter (12-02 months) to detect CODcr system removal rate up to 89.3%, 87.3%, 86.4, SS removal rate 99.2%, 99.6%, 99.8%, NH4-N removal rate 96.2%, 94.3%, 95.2%, TP removal rate all reached 89.0%, 89.6%, 90.6%, heavy metal Cu removal rate 97.9%, 98.6%, 98.8%. The process and water quality index of each stage are shown in the following table, which shows that the system has a higher removal rate in winter.

[0061] Table 112-02 months of each stage process water quality

[0062]

[0063] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A terrestrial-aquatic plant composite floating wetland, characterized by: include: A substrate trough is used for planting terrestrial plants and emergent aquatic plants. A horizontally arranged support mesh plate is provided in the substrate trough. The support mesh plate and the bottom of the substrate trough form a cavity. The bottom of the substrate trough is provided with a through hole or the substrate trough is made of a water-permeable material. An iron particle layer and a carbon particle layer are sequentially provided on the inner side wall of the substrate trough from the outside of the trough to the inside of the trough. A planting substrate is also provided in the space above the support mesh plate. The planting substrate is planted with terrestrial plants and emergent aquatic plants. The driving mechanism is connected to the substrate tank and is used to drive the substrate tank to float up and down in the water so that the bottom of the substrate tank is intermittently submerged in water. Because the bottom of the substrate tank has through holes or a permeable material, water will intermittently enter the substrate tank, thereby preventing the roots of terrestrial plants from being submerged in water. The mixing box is located on one side of the matrix tank, the driving mechanism is installed on the mixing box, and the mixing box floats on the water; the top and bottom of the mixing box are open, and two upper and lower partitions are provided in the mixing box, and the upper and lower partitions divide the interior of the mixing box into an air inlet chamber, a mixing chamber and a water inlet chamber from top to bottom. The air inlet chamber is provided with an air inlet pipe, the mixing chamber is provided with a water outlet pipe, and the water inlet chamber is provided with a water inlet pipe. The upper and lower partitions are both provided with one-way check valves, an upper piston is provided in the air inlet chamber, and a lower piston is provided in the water inlet chamber. An adjusting mechanism for driving the upper and lower pistons to move up and down is provided in the mixing box, and the upper and lower pistons move up and down to draw gas and water into the air inlet chamber and the water inlet chamber respectively, and then the water and gas enter the mixing chamber through the check valve to mix, and the mixed water and gas are discharged through the water outlet pipe; The water treatment mechanism is used to treat the water discharged from the outlet pipe. The outlet pipe is connected to the middle part of the water treatment mechanism. A spiral mud discharge pipe is provided at the lower part of the water treatment mechanism. A filter is provided at the upper part of the water treatment mechanism. A drain pipe is provided on the water treatment mechanism above the filter. The drain pipe discharges the water into the matrix tank, and the water outlet is located above the iron particle layer and the carbon particle layer.

2. The terrestrial-aquatic plant composite floating wetland according to claim 1, characterized in that: There are two substrate troughs, and a space is left between the two substrate troughs and a submerged plant planting cage is set; the mixing boxes are respectively arranged on the outsides of the two substrate troughs, and the two mixing boxes are connected by connecting rails, and the driving mechanism is set on the connecting rails.

3. The terrestrial-aquatic plant composite floating wetland according to claim 2, characterized in that: The driving mechanism includes a first anti-scotch yoke, a sprocket, a driving wheel and a chain. The first anti-scotch yoke is installed on the connecting rail. The matrix groove is connected to the first anti-scotch yoke. The first anti-scotch yoke is also fixedly connected to the sprocket. A driving wheel is rotatably provided on the mixing box. The driving wheel and the sprocket are connected by a chain transmission. The driving wheel is driven to rotate by a motor. The rotation of the driving wheel drives the first anti-scotch yoke to rotate, thereby driving the matrix groove to float up and down.

4. The terrestrial-aquatic plant composite floating wetland according to claim 3, characterized in that: The first anti-rotation yoke includes a rotating wheel, a guide ring, a fixed rod and a guide rod. The rotating wheel is rotatably installed on the connecting rail. The fixed rod is vertically fixed to the edge of the rotating wheel. The guide ring is sleeved on the fixed rod. The guide ring is oblong. The length of the guide ring extends in the horizontal direction. Guide rods are fixed above and below the guide ring. Support rods are fixed at the upper and lower ends of the guide rod. The upper and lower parts of the matrix groove are respectively fixed to the upper and lower support rods by steel wires.

5. The terrestrial-aquatic plant composite floating wetland according to claim 4, characterized in that: The first anti-swivel yoke is installed on the connecting rail through a fixing plate. There are two groups of connecting rails and they are symmetrically arranged on both sides of the mixing box. Each group of connecting rails consists of two rods and they are arranged up and down. The runner is located between the two connecting rails. An annular groove is provided on the outer periphery of the runner. The upper and lower connecting rods are stuck in the annular groove to limit the runner.

6. The terrestrial-aquatic plant composite floating wetland according to claim 4, characterized in that: The adjustment mechanism includes a second scotch yoke, the structure of the second scotch yoke is the same as that of the first scotch yoke, the two guide rods of the second scotch yoke are respectively connected to the upper piston and the lower piston, and the second scotch yoke is driven to rotate by a motor.

7. The terrestrial-aquatic plant composite floating wetland according to claim 6, characterized in that: The mixing box is also provided with a solar panel and a battery, the solar panel is connected to the battery, and the battery is connected to the motor.

8. The terrestrial-aquatic plant composite floating wetland according to claim 1, characterized in that: A gap is left between the swirl mud discharge pipe and the side wall of the water treatment mechanism to form a reflux channel. A reflux pipe connected to the reflux channel is provided at the lower part of the water treatment mechanism; an air blowing pipe connected to the drain pipe is also provided above the water treatment mechanism.

9. Use of the terrestrial-aquatic plant composite floating wetland according to any one of claims 1 to 8 for purifying water quality in a wetland system, characterized in that: When the floating wetland is conducting water treatment, the sewage is first naturally precipitated. Then, the water inlet pipe of the mixing box is located in the underwater section of the floating wetland. The huge number of plant roots and biofilm-forming microorganisms distributed in this part serve as the biological contact oxidation reaction zone for the sewage. When the piston plate below the mixing box is continuously lifted up to inlet water, the contact oxidation zone is aerated and reoxygenated through the up and down floating of the entire matrix tank and the cavity below it, completing the primary and secondary treatment of the sewage. The mixing box and water treatment mechanism quickly oxidize, complex and precipitate the sewage, completing the secondary and tertiary treatment of the sewage. The effluent from the mixing reaction box is then further deeply treated through the terrestrial-aquatic composite vertical subsurface wetland.

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