A micro modular artificial wetland unit and its application

Abstract

The present invention discloses a micro-modular artificial wetland unit and its application, including a wetland core module and an integrated honeycomb module; the wetland core module and the integrated honeycomb module are provided with a plug interface on the module wall and are connected through the plug interface, and a sealing ring is provided in the plug interface; the wetland core module comprises any one or more of a positioning plate, an integrated water and air distribution pipe, a filler module, an aquatic plant planting module and a floating annular water collection module. The present invention utilizes a construction mode of combining wetland core modules and integrated honeycomb modules with different functional components in a simple assembly configuration, which can quickly build artificial wetland units with different purification processes. By combining the wetland core module and the integrated honeycomb module, it provides higher purification efficiency and space utilization while treating sewage; and through the free combination of functional plug-ins, it realizes the construction of different wetland operating conditions and the orderly storage of plug-ins, and has both remote control and online water quality monitoring functions, with a wide range of applicable scenarios.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to a micro modular artificial wetland unit and its application. Background Art

[0002] To more efficiently treat wastewater, constructed wetlands are now commonly used to deeply purify rural domestic sewage and reduce nitrogen and phosphorus concentrations. Constructed wetlands utilize the synergistic effects of soil, microorganisms, and plants to purify wastewater through adsorption, precipitation, and degradation, making them environmentally friendly. Constructed wetlands are widely used as an environmentally friendly wastewater treatment technology. Traditional constructed wetland designs typically use free-growing plants and filler materials to treat organic and inorganic pollutants in wastewater. However, traditional constructed wetland unit designs have limitations, such as low space utilization and difficulty in assembly and maintenance. Traditional constructed wetlands often rely on free-growing wetland plants and filler materials to treat wastewater, requiring large land areas for construction. The free-growing plants and filler materials also result in low space utilization. Furthermore, the operation and maintenance costs of traditional constructed wetlands are high, requiring managers to frequently prune and clean plants to maintain the wetland's effectiveness. To overcome these issues, modular constructed wetland system designs are gaining attention.

[0003] Chinese patent CN107416982A discloses a modular artificial wetland device, which is composed of a combination of several independent module frames. At least two packing units are provided in the module frame. A packing frame and a support plate supporting the packing frame are provided between each packing unit. A floating bed with several through holes for placing flower pots is provided on the top of the module frame. At least two clamping columns are provided on any two asymmetric side walls of the module frame, and at least two clamping slots corresponding to the positions of the clamping columns are provided on the two side walls symmetrical to the two side walls provided with at least two clamping columns; the width L1 of the clamping column is greater than the width L2 of the clamping slot. The device has a simple structure and is easy to assemble and disassemble. It can be easily assembled into wetland devices of various shapes and can effectively suppress blockage. It can improve water quality while obtaining benefits from growing aquatic plants.

[0004] Chinese patent CN102603077A discloses a modular, detachable constructed wetland system. The system is composed of several independent wetland modules, each containing several detachable packing units. The packing units consist of a packing frame, mesh screens, and a packing layer, which, from top to bottom, includes a soil layer, a soil barrier layer, and a porous, lightweight packing layer. Depending on the quality, volume, and effluent requirements of the wastewater being treated, the wetland modules can be connected in series, parallel, or a combination of these to form a constructed wetland system.

[0005] Chinese patent CN104743674B discloses a modular constructed wetland treatment device, comprising a tank body, which is divided into three sections: a pretreatment chamber, a filtration and biodegradation chamber, and a drainage control chamber, separated by the direction of water flow. The pretreatment chamber is equipped with a filter device and an inlet unit located above. The outer wall of the filter device has filter holes with a diameter of 0.5cm-2cm. The filter device is equipped with a pretreatment outlet pipe that feeds filtered water into the filtration and biodegradation chamber. The lower part of the drainage control chamber is equipped with an outlet unit. It is a movable integrated sewage treatment device, and its placement is not restricted by the site.

[0006] However, the existing modular artificial wetland system units are bulky and inconvenient to transport and assemble. The design, manufacturing and installation costs of the modular system are relatively high, and it is not easy to carry out inspection, maintenance, and upgrades of functional plug-ins. Moreover, the position and function of a single wetland unit and functional plug-in are fixed, and cannot be freely selected, assembled, and connected as the application scenario changes. At the same time, they are all placed on the ground during the application process, which is not suitable for sewage purification in remote rural areas or mountainous areas where electricity is difficult to access. Management and maintenance are inconvenient, and ground space is wasted, and rural terrain is not fully utilized. Therefore, it is necessary to provide a miniature modular artificial wetland unit that improves space utilization while ensuring sewage purification efficiency, concentrates functions, and facilitates free assembly in multiple scenarios. Summary of the Invention

[0007] In response to the above technical problems, the present invention provides a micro modular artificial wetland unit and its application, which is easy to transport and assemble, and improves the wastewater purification efficiency and space utilization.

[0008] In order to achieve the above-mentioned purpose, the present invention provides a micro modular artificial wetland unit, comprising a wetland core module and an integrated honeycomb module; the wetland core module and the integrated honeycomb module are provided with an insertion interface on the module wall and are connected through the insertion interface, and a sealing ring is provided in the insertion interface.

[0009] Preferably, the optional accessories in the wetland core module include any one or more of a positioning plate, an integrated water and air distribution pipe, a filler module, an aquatic plant planting module and a floating annular water collection module; the wetland core module has an online water quality monitoring system.

[0010] Further preferably, the wetland core module is a hexagonal cylinder; the integrated honeycomb modules are respectively plugged into the sides of the hexagonal cylinder to form a honeycomb structure.

[0011] Further preferably, the ratio of the diameter to the height of the wetland core module is 1:1-3; the ratio of the height of the integrated honeycomb module to the height of the wetland core module is 1:3-5.

[0012] Preferably, the positioning plate includes a pipeline groove, a protruding portion and a groove portion, and the positioning plate is laid on the bottom of the wetland core module.

[0013] Preferably, the floating annular water collection module consists of an annular hose and a float; the annular hose is provided with holes and a water collection port.

[0014] Further preferably, the holes are distributed on the upper and lower sides of the annular hose, the side in contact with water has a water flow function, the side in contact with air has a ventilation function, and the aperture of the holes gradually increases from the near water outlet to the far water outlet; the water outlet is connected to the hose to discharge the collected water out of the unit.

[0015] Preferably, the integrated honeycomb module includes a top cover, module walls, a breathable bottom net and a functional plug-in; the top cover is a solar power generation top cover and also has a battery; the solar power generation top cover is connected to the functional plug-in to supply power to the functional plug-in.

[0016] Further preferably, the functional plug-in is any one of a flushing plug-in, a water distribution plug-in and an aeration plug-in, and each functional plug-in is equipped with a remote control system.

[0017] Further preferably, the flushing plug-in is provided with a vacuum pump, which is connected to a hose; both ends of the water distribution plug-in are connected to the hose, and the hose used for water inlet to the wetland core module is connected to the integrated water and air distribution pipe; one end of the aeration plug-in is connected to the hose, and the hose used for air inlet to the wetland core module is connected to the integrated water and air distribution pipe.

[0018] Furthermore, the integrated water and air distribution pipe includes a water pipe and an air pipe sleeved inside the water pipe, and is divided into a perforated part and a non-perforated part; the water pipe in the perforated part is provided with a water pipe hole, and the air pipe is provided with an air pipe hole; the water pipe in the non-perforated part is connected to the water distribution plug-in through a hose, and the air pipe is connected to the aeration plug-in through a hose.

[0019] Preferably, the pipeline groove on the positioning plate is used to fix the integrated water and air distribution pipe, and the groove part is used to fix any one or more of the filler module and the aquatic plant planting module; a plurality of small mesh cages are provided in the filler module.

[0020] Further preferably, the small mesh cage can be filled with one or more fillers, the arrangement order can be adjusted arbitrarily, and can be freely disassembled and assembled.

[0021] The present invention also provides an application of a micro-modular artificial wetland unit, which can be placed on the ground or half-buried underground. Multiple micro-modular artificial wetland units can be connected in series or parallel through hoses and applied to sewage purification.

[0022] Preferably, when used, a freely selected functional plug-in is placed in the integrated honeycomb module, and then fixed to the wetland core module through the plug interface. A single micro-modular artificial wetland unit is assembled into any one of various artificial wetland process types such as a micro-aerated vertical flow wetland unit, a horizontal submerged flow wetland unit, and a submerged plant oxidation pond unit. Then, the various artificial wetland units are connected in series according to the process to achieve sewage purification.

[0023] The beneficial effects of the present invention are:

[0024] 1. The wetland core module and the integrated honeycomb module are combined to form the core components of the micro-modular artificial wetland unit. They can be quickly connected through the plug-in interface, and artificial wetland units with different purification processes can be quickly built. While treating wastewater and pollutants, they provide higher purification efficiency and space utilization. They are also equipped with a remote control system and an online water quality monitoring system, and have a wide range of application scenarios.

[0025] 2. An integrated honeycomb module with 6 universal sockets is configured outside each wetland core module. A variety of functional plug-in combinations can be selected for insertion to achieve the construction of different wetland operating conditions and the orderly storage of plug-ins. It can also carry out inspection, maintenance, and upgrade of a certain functional plug-in at any time without affecting the operation of the wetland. In addition, the side walls of the two modules are provided with closable plug-in interfaces, and the access pipelines can realize the connection between the wetland core and the system water inlet, the wetland core and the functional plug-ins in the integrated honeycomb, and different wetland units; multiple micro-modular artificial wetland units can be used in series or parallel; when the efficiency of a unit of micro-modular artificial wetland units used in series or parallel has decreased or is no longer suitable for the current scenario after a period of operation, its function can be adjusted by adjusting the functional plug-ins, accessories and module composition in the unit, avoiding the replacement of the entire unit due to functional adjustments, and improving the adaptability to scene and environmental changes.

[0026] 3. A positioning plate with both fixed pipeline slots and fixed functional component slots is used to form an air and water distribution module, which can quickly arrange water and air pipelines of different shapes. Combined with modular water and air distribution integrated pipes, it can also achieve simultaneous water and air distribution; the component slots in the positioning plate can be used to plug in additional functional components, which facilitates the rapid construction of a wetland purification process exclusive to the wetland core module.

[0027] 4. By using the nested structure filler components fixed by matching slots, the positioning and quantitative layout of various functional fillers such as wetland denitrification fillers, slow-release solid bacteria agents, matrix and their combinations can be quickly realized, and they can be removed or supplemented and replaced in situ at any time.

[0028] 5. The wetland core module in the present invention can be half-buried underground when used, leaving only the integrated honeycomb module and the upper half of the wetland core module, making full use of the terrain advantages to ensure that the micro-modular artificial wetland unit has a good fixing effect while ensuring the free assembly of integrated honeycomb modules with different functional plug-ins, thereby improving the utilization rate of the ground space.

[0029] 6. The present invention uses a solar panel top cover integrated in the honeycomb module to power all electrical equipment in the unit, and also has a battery to ensure normal and continuous operation at night when there is no light. It can be promoted and applied in sewage purification in remote rural areas or mountainous areas where electricity is difficult to access. It is green, energy-saving, economical and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0031] Figure 2 It is a top view of the present invention.

[0032] Figure 3 It is a structural diagram of functional plug-ins and plug-in interfaces. In the figure, A is the flushing plug-in, B is the water distribution plug-in, C is the aeration plug-in, and D is the plug-in interface.

[0033] Figure 4 It is a structural diagram of the positioning plate and the integrated water and air distribution pipe. In the figure, A is a schematic diagram of the fixation of the positioning plate and the integrated water and air distribution pipe, and B is a structural diagram of the integrated water and air distribution pipe.

[0034] Figure 5 A is a schematic diagram of the structure of the positioning plate, in which A is a top view of the positioning plate and B is a side view of the positioning plate.

[0035] Figure 6 This is a structural diagram of a floating annular water collection module, where A is a top view and B is a side sectional view.

[0036] Figure 7 Schematic diagram of the series-parallel structure of multiple micro-modular artificial wetland units.

[0037] In the figure, 1 is a wetland core module, 2 is an integrated honeycomb module, 3 is a functional plug-in, 4 is a positioning plate, 41 is a pipeline trough, 42 is a protruding part, 43 is a groove, 5 is an integrated water and air distribution pipe, 51 is a water pipe, 52 is an air pipe, 53 is a water pipe hole, 54 is an air pipe hole, 6 is a filler module, 7 is an aquatic plant planting module, 8 is a floating annular water collection module, 9 is a top cover, 91 is a breathable solar top cover, 10 is a plug-in interface, 11 is a module wall, 12 is a breathable bottom net, 13 is a small mesh cage, 14 is a vacuum pump, 15 is a flushing plug-in, 16 is a hose, 17 is a water distribution plug-in, 18 is an aeration plug-in, 19 is a sealing ring, 20 is a float, 21 is a hole, 22 is a water outlet, and 23 is a ring-shaped water collection pipe. DETAILED DESCRIPTION

[0038] The technical solutions of the present invention are further explained below with reference to the accompanying drawings and specific embodiments. It is worth noting that the following embodiments are only preferred embodiments of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the claims. Any modifications or substitutions made to the technical solutions of the present invention by those skilled in the art without creative effort shall fall within the scope of protection of the present invention.

[0039] Example 1

[0040] like Figure 1-7 As shown, a micro modular artificial wetland unit includes a wetland core module 1 and an integrated honeycomb module 2; the wetland core module 1 and the integrated honeycomb module 2 are provided with a plug-in interface 10 on the module wall 11 and are connected through the plug-in interface 10, and a sealing ring 19 is provided in the plug-in interface 10 to fix the integrated honeycomb module 2 on the wetland core module 1, which is convenient for fixing and combining plug-ins with different functions.

[0041] Preferably, the optional accessories in the wetland core module 1 include any one or more of a positioning plate 4, an integrated water and air distribution pipe 5, a filler module 6, an aquatic plant planting module 7 and a floating annular water collection module 8; the positioning plate 4 is arranged at the bottom of the wetland core module 1 for fixing any one or more of the integrated water and air distribution pipe 5, the filler module 6 and the aquatic plant planting module 7.

[0042] Further preferably, the wetland core module 1 is a hexagonal cylinder; the integrated honeycomb module 2 is a box with isosceles trapezoids on the upper and lower sides, which are respectively plugged into the sides of the hexagonal cylinder to form a honeycomb structure, thereby improving land utilization and facilitating the serial assembly of multiple micro-modular artificial wetland units. It can also improve the adaptability to application scenarios, and the water inlet position, water outlet position and functional module setting position are selected according to the actual scenario.

[0043] Further preferably, the ratio of the diameter to the height of the wetland core module 1 is 1:1-3; the ratio of the height of the integrated honeycomb module 2 to the height of the wetland core module 1 is 1:3-5, and the ratio of the waist length to the height is 1-1.5:1.

[0044] Preferably, the positioning plate 4 includes a pipeline groove 41, a protrusion 42 and a groove portion 43; the pipeline grooves 41 of two adjacent positioning plates 4 are connected and used together to fix the pipeline, and the groove portion 43 can be used to fix the filler module 6 and / or the aquatic plant planting module 7.

[0045] Preferably, the floating annular water collection module 8 consists of an annular hose 23 and a float 20; the annular hose 23 is provided with holes 21 and a water outlet 22 to facilitate the collection, outflow and gas penetration of water; the float 20 can control the draft height by adjusting the buoyancy and automatically adapt to different operating water levels.

[0046] Further preferably, the holes 21 are distributed on the upper and lower sides of the annular hose, and the side in contact with water has a water flow function, which controls the amount of water in the unit and discharges the purified water at the same time; the side in contact with air has a ventilation function, which facilitates the entry of air; and the aperture of the holes 21 gradually increases from the near water outlet to the far water outlet; the water outlet 22 is connected to the hose, and the collected water is discharged from the unit through the integrated honeycomb module 2.

[0047] Preferably, the integrated honeycomb module 2 includes a top cover 9, a module wall 11 and a breathable bottom net 12, with a functional plug-in 3 provided inside. The top cover 9 can isolate external impurities and sewage, and the breathable bottom net 12 is used to fix the functional plug-in 3; the top cover 9 is a solar power generation top cover 91 and also has a battery; the solar power generation top cover 91 is connected to the functional plug-in 3 to power the functional plug-in 3.

[0048] Further preferably, the functional plug-in 3 is any one or more of a flushing plug-in 15 , a water distribution plug-in 17 and an aeration plug-in 18 .

[0049] Further preferably, the flushing plug-in 15 is provided with a vacuum pump 14, which is connected to one end of the hose 16 and the other end is located at the positioning plate 4. The flushing plug-in uses negative pressure suction to extract sludge, snails and other debris from the bottom of the wetland core, so that regular water pumping and flushing of the entire pipeline can be achieved, and the deposited sludge, parasitic organisms, etc. are sucked and concentrated in the flushing plug-in 15 and discharged regularly; both ends of the water distribution plug-in 17 are connected to the hose 16, and the hose 16 for water intake into the wetland core module 1 is connected to the integrated water and air distribution pipe 5, and the exogenous sewage is pumped into the unit through the water distribution plug-in 17 and the hose 16 for purification; one end of the aeration plug-in 18 is connected to the hose 16 for air intake into the wetland core module 1, and the hose 16 is connected to the integrated water and air distribution pipe 5, so that outside air is pumped into the unit to provide sufficient oxygen for the water in the unit.

[0050] Furthermore, the integrated water and air distribution pipe 5 includes a water pipe 51 and an air pipe 52 sleeved inside the water pipe 51, which concentrates the pipelines while improving the uniformity of water and gas distribution; the integrated water and air distribution pipe 5 is divided into a perforated part and a non-perforated part; the water pipe 51 of the perforated part is provided with a water pipe hole 53, and the air pipe 52 is provided with an air pipe hole 54, and the water pipe 51 and the air pipe 52 of the perforated part are fixed to the bottom of the wetland core module 1 through the pipeline groove 41 on the positioning plate 4; the water pipe 51 of the non-perforated part is connected to the water distribution plug-in 17 through the hose 1 to pump external sewage into the unit, and the air pipe 52 is connected to the aeration plug-in 18 through the hose 16 to transport external air to the unit to increase the oxygen content of the water.

[0051] Preferably, the pipeline grooves 41 on the two adjacent positioning plates 4 are combined to fix the integrated water and air distribution pipe 5, and the groove part 43 is used to fix any one or more of the aquatic plant planting module 7 and the filling module 6. Specifically, the aquatic plant planting module 7 is inserted into a groove part 43 to achieve fixation, and the bottom support of the filling module 6 is inserted into several adjacent groove parts 43 to achieve fixation of the filling module 6; a plurality of small mesh cages 13 are provided in the filling module 6.

[0052] Further preferably, the small mesh cage 13 can be filled with one or more fillers, and the arrangement order can be adjusted arbitrarily to form different filler combinations, which can be taken out or replaced or supplemented in situ.

[0053] Example 2 Micro-aeration vertical flow wetland unit

[0054] (1) Prepare a hexagonal cylinder with a side length of 25 cm and a height of 100 cm as the wetland core module 1, and set a plug interface 10 on the side wall at a height of 90 cm. The bottom is covered with positioning plates 4. At the same time, the water and air distribution integrated pipes 5 are fixed to the bottom of the wetland core module 1 in a spiral shape through the positioning plates 4;

[0055] (2) The integrated honeycomb module 2 is fixed to the six sides of the wetland core module 1 through the plug interface, and then divided into a water supply module and an air supply module. A water distribution plug-in 17 is installed in the water supply module, and the external sewage is pumped into the unit through the hose 16 and the water pipe 51 in the water and air distribution integrated pipe 5; an aeration plug-in 18 is installed in the air supply module, and the external air is pumped into the unit through the hose 16 and the air pipe 52 in the water and air distribution integrated pipe 5, so that the aeration volume is 0.3m 3 / h; wherein the top cover 9 in the air supply module is replaced with a breathable solar top cover 91 to provide power for the aeration plug 18;

[0056] (3) Add gravel to the small mesh cage 13 in the filling module 6, with an effective height of 60 cm, and fix it in the groove part 43 on the positioning plate 4; at the same time, plant Siberian iris in the aquatic plant planting module 7, with a planting density of 28 plants / m 2 , and then insert the aquatic plant planting module 7 into the groove portion 43 for fixation;

[0057] (4) Put in the floating annular water collection module 8, then connect the water collection port 22 to the hose, and the hose will be discharged from the unit after passing through an empty integrated honeycomb module 2. The operating water depth of the unit is 90cm and the hydraulic load is 7.65m 3 ·m -2 d -1 The water residence time is achieved through the water distribution plug-in, the residence time is 0.12d, and the air-water ratio is 1:1.

[0058] Example 3 Horizontal subsurface flow wetland unit

[0059] (1) Prepare a hexagonal cylinder with a side length of 62.5 cm and a height of 100 cm as the wetland core module 1, and set a plug interface 10 on the side wall at a height of 65 cm. The bottom is covered with positioning plates 4. At the same time, the water and air distribution integrated pipes 5 are fixed to the bottom of the wetland core module 1 in a spiral shape through the positioning plates 4;

[0060] (2) The integrated honeycomb modules 2 are fixed to the six sides of the wetland core module 1 through the plug interface, one of the integrated honeycomb modules 2 is used as a water supply module, a water distribution plug-in 17 is installed in it, and external sewage is pumped into the unit through the hose 16 and the water pipe 51 in the water and air distribution integrated pipe 5;

[0061] (3) Add denitrifying carbon source filler (prepared according to the method provided in Example 1 of patent CN201920959814.6) to the small mesh cage 13 in the filler module 6. The filler has an effective height of 70 cm and is fixed to the groove portion 43 on the positioning plate 4. At the same time, plant calamus and cycad in the aquatic plant planting module 7 at a planting density of 20 plants / m 2 , and then insert the aquatic plant planting module 7 into the groove portion 43 for fixation;

[0062] (4) Put in the floating annular water collection module 8, then connect the water collection port 22 to the hose, and the hose will be discharged from the unit after passing through an empty integrated honeycomb module 2. The operating water depth of the unit is 65cm and the hydraulic load is 1.15m. 3 ·m -2 d -1 The water retention time is achieved through the water distribution plug-in, and the retention time is 1.30d.

[0063] Example 4 Submerged Plant Oxidation Pond Unit

[0064] (1) Prepare a hexagonal cylinder with a side length of 72 cm and a height of 100 cm as the wetland core module 1, and set a plug interface 10 at 65, and cover the bottom with positioning plates 4. At the same time, fix the water and air distribution integrated pipes 5 to the bottom of the wetland core module 1 in a spiral shape through the positioning plates 4;

[0065] (2) The integrated honeycomb modules 2 are fixed to the six sides of the wetland core module 1 through the plug interface, one of the integrated honeycomb modules 2 is used as a water supply module, a water distribution plug-in 17 is installed in it, and the external sewage is pumped into the unit through the hose 16 and the water pipe 51 in the water and air distribution integrated pipe 5; one of the integrated honeycomb modules 2 is selected as a backwash module, the flushing plug-in 15 is installed in it, and then the vacuum pump 14 and the hose 16 are connected. The hose extending into the bottom of the wetland core module 1 is fixed through the pipeline groove 41 of the positioning plate 4;

[0066] (3) Gravel is added to the small mesh cage 13 in the filling module 6, with an effective height of 20 cm, and fixed to the groove portion 43 on the positioning plate 4; at the same time, Vallisneria and Potamogeton crispus are planted in the aquatic plant planting module 7, with the planting density of Vallisneria being 35 plants / m 2 The planting density of water chestnut is 35 plants / m 2 , and then insert the aquatic plant planting module 7 into the groove portion 43 for fixation;

[0067] (4) Put in the floating annular water collection module 8, then connect the water collection port 22 to the hose, and the hose will be discharged from the unit after passing through an empty integrated honeycomb module 2. The operating water depth of the unit is 20 cm and the hydraulic load is 1.25 m. 3 ·m -2 d -1 The water retention time is achieved through the water distribution plug-in, and the retention time is 1.60d.

[0068] Example 5 Composite artificial wetland unit

[0069] The micro-aerated vertical flow wetland unit, horizontal submerged flow wetland unit and submerged plant oxidation pond unit constructed in Example 2-4 were connected in sequence to form a composite artificial wetland unit with a design flow of 1.5 m 3 ·d -1. The operation monitoring time is from January to May in spring and summer. Use an inlet pump (model 1WZB-45, Zhejiang Santong Pump Industry Co., Ltd.) to pump the effluent from the secondary sedimentation tank of the rural domestic sewage treatment plant into a 2000L water storage barrel as the inlet of the composite wetland system. The effluent from the submerged plant oxidation pond unit flows into another 2000L water storage barrel. The water samples of the inlet, micro-aerated vertical flow wetland unit, horizontal submerged flow wetland unit, and submerged plant oxidation pond unit were tested. The inlet water sample was directly taken from the water storage barrel. Each water sample was collected from the sampling port of each unit. The water samples were all tested on the same day. The water quality index determination method is shown in Table 1, and the average changes in the water quality indicators of the composite artificial wetland unit are shown in Table 2.

[0070] Table 1 Water quality index determination method

[0071]

[0072] Table 2 Average changes in water quality indicators of composite constructed wetland units

[0073]

[0074] As shown in Table 2, the micro-aerated vertical flow wetland unit, the horizontal submerged flow wetland unit and the submerged plant oxidation pond unit showed good purification effect as a whole, and the denitrification effect was excellent. The TN and NH4 + -N, TP, COD Cr The average concentration of SS has decreased, and the tail water of the sewage treatment plant has been raised to the surface Class IV standard shown in GB3838-2002.

Claims

1. A micro modular artificial wetland unit, characterized by: It comprises a wetland core module (1) and an integrated honeycomb module (2); a plug-in interface (10) is provided on the module wall (11) of the wetland core module (1) and the integrated honeycomb module (2) and is connected via the plug-in interface (10); a sealing ring (19) is provided in the plug-in interface (10) to fix the integrated honeycomb module (2) on the wetland core module (1); The wetland core module (1) comprises a positioning plate (4), an integrated water and air distribution pipe (5), a filler module (6), an aquatic plant planting module (7), and a floating annular water collection module (8); the integrated water and air distribution pipe (5), the filler module (6), and the aquatic plant planting module (7) are fixed on the positioning plate (4); The integrated honeycomb module (2) comprises a top cover (9), a module wall (11), a breathable bottom net (12) and a functional plug-in (3); the top cover (9) is a solar power generation top cover (91), the solar power generation top cover (91) also has a storage battery and is connected to the functional plug-in (3); the breathable bottom net (12) is used to fix the functional plug-in (3); The functional plug-in (3) is any one of a flushing plug-in (15), a water distribution plug-in (17), and an aeration plug-in (18).

2. The micro modular artificial wetland unit according to claim 1, characterized in that: The positioning plate (4) comprises a pipeline groove (41), a protruding portion (42) and a groove portion (43), and the positioning plate (4) is laid on the bottom of the wetland core.

3. The micro modular artificial wetland unit according to claim 1, characterized in that: The floating annular water collection module (8) is composed of an annular hose (23) and a float (20); the annular hose (23) is provided with a hole (21) and a water collection port (22).

4. The micro modular artificial wetland unit according to claim 1, characterized in that: The flushing plug-in (15) is provided with a vacuum pump (14), which is connected to a hose (16); both ends of the water distribution plug-in (17) are connected to the hose (16), which is connected to the integrated water and air distribution pipe (5); and one end of the aeration plug-in (18) is connected to the hose (16), which is connected to the integrated water and air distribution pipe (5).

5. The micro modular artificial wetland unit according to claim 4, characterized in that: The integrated water and air distribution pipe (5) comprises a water pipe (51) and an air pipe (52); the water pipe (51) is provided with a water pipe hole (53), and the air pipe (52) is provided with an air pipe hole (54); the water pipe (51) is connected to the water distribution plug-in (17) via a hose (16), and the air pipe (52) is connected to the aeration plug-in (18) via a hose (16).

6. The micro modular artificial wetland unit according to claim 1, characterized in that: A plurality of small mesh cages (13) are provided in the filler module (6), and any one or more fillers can be filled in the small mesh cages (13).

7. An application of the micro modular artificial wetland unit according to any one of claims 1 to 6, characterized in that: The micro-modular artificial wetland unit can be placed on the ground or semi-buried underground, and multiple micro-modular artificial wetland units can be connected in series or in parallel via hoses (16) for use in sewage purification.

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