A vertical submerged modular constructed wetland treatment system

Abstract

The present invention relates to a vertical submerged modular artificial wetland treatment system. It mainly includes a primary packing unit and a plurality of secondary packing units located on the downstream side of the primary packing unit. The primary packing unit and the plurality of secondary packing units are sequentially connected through a water distribution unit. The primary packing unit is provided with a modular packing area. One end of the modular packing area is provided at the water inlet end of the primary packing unit. A plurality of modular packings are arranged in an array in the modular packing area. The place where artificial wetlands are most prone to blockage is inside the primary packing unit. Therefore, the present application sets a modular packing area inside the primary packing unit, and modular packings are arranged in the modular packing area. After blockage occurs inside the primary packing unit, only part of the modular packings needs to be taken out, and the taken out modular packings need to be cleaned and then backfilled for use. The whole process is relatively time-consuming and can save the amount of packing used, which is conducive to reducing the use cost of artificial wetlands.

Description

Technical Field

[0001] The invention relates to the field of ecological treatment, in particular to a vertical submerged flow modular artificial wetland treatment system. Background Art

[0002] At present, the blockage problem of artificial wetland treatment system is quite serious. It is mainly reflected in two aspects: first, wetland is prone to blockage, and second, it is difficult to deal with the blockage of filler.

[0003] The clogging problem has always been difficult to avoid and solve, mainly due to the following reasons: 1. Organic and inorganic suspended matter in sewage is deposited on the surface of the wetland, forming a clogging pad, causing external clogging of the wetland. At the same time, there are pores between and inside the wetland matrix particles. After the particles are worn, smaller particles will be blocked in the filler pores, making it difficult for water to pass through, causing internal clogging of the wetland. 2. The characteristics of the filler itself will chemically precipitate with substances in the water, causing clogging. 3. Sludge formed on the surface of the filler by microorganisms and plant humus.

[0004] The filler matrix used in traditional artificial wetlands is granular. Granular fillers do not prevent clogging, and once clogging occurs, the entire artificial wetland needs to be replaced with a new batch of fillers, which will bring a lot of work and increase the cost of use, and also have a great impact on the stable operation of water quality.

[0005] The COD of the currently used particle fillers Cr The values ​​of surface pollution load, ammonia nitrogen surface pollution load, total phosphorus surface pollution load, total nitrogen surface pollution load and hydraulic load are relatively low, which greatly increases the area of ​​the wetland and thus increases the investment cost. Summary of the invention

[0006] Based on this, it is necessary to provide a vertical submerged modular constructed wetland treatment system to address the problem that after traditional constructed wetlands become clogged, a large amount of fillers need to be replaced, which is labor-intensive and costly.

[0007] A vertical submerged modular artificial wetland treatment system includes a primary packing unit and a plurality of secondary packing units located on the downstream side of the primary packing unit, wherein the primary packing unit and the plurality of secondary packing units are connected in sequence through a water distribution unit, and the primary packing unit is provided with a modular packing area, one end of the modular packing area is arranged at the water inlet end of the primary packing unit, and a plurality of modular packings are arranged in an array in the modular packing area.

[0008] Through research, it is found that the most likely place for artificial wetlands to become clogged is inside the primary packing unit. Therefore, the present application sets up a modular packing area inside the primary packing unit, and modular packing is set up in the modular packing area. When a blockage occurs inside the primary packing unit, only part of the modular packing needs to be taken out, and the taken out modular packing needs to be cleaned and then refilled for use. The whole process is relatively time-saving and can save the amount of packing used, which is conducive to reducing the cost of using artificial wetlands.

[0009] In one embodiment, the water distribution unit includes a plurality of water distribution pipes and a plurality of water collecting pipe layout layers, the primary filling unit includes a primary supporting wall, the primary supporting wall encloses the modular filling area, each modular filling in the modular filling area is a modular biomass filler, a water distribution pipe is arranged on the top of the modular filling area, and a water collecting pipe layout layer is arranged on the bottom of the modular filling area.

[0010] In one embodiment, the multiple secondary filling units are arranged in an array, with at least two secondary filling units in each row, and two adjacent rows of secondary filling units are connected through a water distribution pipe and a water collection pipe arrangement layer, and the last row of secondary filling units is connected to the water outlet pipe through a water collection pipe arrangement layer.

[0011] In one embodiment, the number of secondary packing units in each row is 3.

[0012] In one embodiment, each secondary packing unit includes a secondary supporting wall, and the area enclosed by the secondary supporting wall is provided with an upper modular packing area, a biomass packing layer and a lower modular packing area in order from top to bottom. A plurality of modular biomass packings are arranged in the upper modular packing area, and a plurality of modular biomass permeable bricks are arranged in the lower modular packing area. The height of the upper modular packing area is less than the height of the lower modular packing area, and the thickness of the modular biomass packing in the upper modular packing area is greater than the thickness of the modular biomass permeable bricks in the lower modular packing area. The biomass packing layers are arranged in layers, and the particle size of the biomass packing in the upper layer is greater than the particle size of the biomass packing in the lower layer. A water distribution pipe is arranged above the upper modular packing area, and a water collecting pipe arrangement layer is arranged at the bottom of the lower modular packing area. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top view of a vertical submerged flow artificial wetland treatment system according to an embodiment of the present invention.

[0014] Figure 2 for Figure 1 CC cross-section diagram.

[0015] Figure 3 for Figure 1DD cross-sectional view.

[0016] in:

[0017] 40. Modular packing area 40A. Upper modular packing area

[0018] 40B, Lower modular filling area

[0019] 66. Biomass filler on the upper layer 67. Biomass filler on the lower layer

[0020] 80. Water distribution pipe 90. Water collection pipe layout layer

[0021] 400, primary filling unit 410, primary supporting wall

[0022] 500. Secondary filling unit 510. Secondary supporting wall. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] like Figure 1 As shown, an embodiment of the present invention provides a vertical submerged modular artificial wetland treatment system, which includes a primary filler unit 400 and a plurality of secondary filler units 500 located on the downstream side of the primary filler unit 400, wherein the primary filler unit 400 and the plurality of secondary filler units 500 are sequentially connected through a water distribution unit, and the primary filler unit 400 is provided with a modular filler area 40, one end of the modular filler area 40 is provided at the water inlet end of the primary filler unit 400, and a plurality of modular fillers are arranged in an array in the modular filler area 40.

[0027] Through research, it is found that the most likely place for artificial wetlands to be clogged is inside the primary packing unit 400. Therefore, the present application sets a modular packing area 40 inside the primary packing unit 400, and modular packing is set inside the modular packing area 40. When a blockage occurs inside the primary packing unit 400, only part of the modular packing needs to be taken out, and the taken out modular packing needs to be cleaned and then refilled for use. The whole process is relatively time-saving and can save the amount of packing used, which is conducive to reducing the use cost of artificial wetlands.

[0028] It should be noted that the modular filler can be a modular biomass filler, etc. When used, the modular biomass filler is stacked layer by layer. The modular biofiller is to make the biomass filler into modules, and the shape and structure of the specific module can be set according to actual needs. For example, it can be made into a cubic shape, etc.

[0029] It should be noted that artificial wetland systems are generally divided into horizontal submerged flow and vertical submerged flow. The water flow in each packing unit of the horizontal submerged flow artificial wetland system basically flows horizontally from one end of the packing unit to the other end. The water flow in each packing unit of the vertical submerged flow artificial wetland system flows from the top of the packing unit to the bottom of the packing unit.

[0030] In this embodiment, when the artificial wetland system is a vertical submerged flow type, Figures 1 to 3 As shown, the water distribution unit includes a plurality of water distribution pipes 80 and a plurality of water collecting pipe arrangement layers 90, the first-level filling unit 400 includes a first-level supporting wall 410, and the first-level supporting wall 410 encloses the modular filling area 40. Each modular filling in the modular filling area 40 is a modular biomass filler. The top of the modular filling area 40 is provided with a water distribution pipe 80, and the bottom of the modular filling area 40 is provided with a water collecting pipe arrangement layer 90.

[0031] It should be noted that the fillers inside the primary filler unit 400 are all modular biomass fillers. When in use, the sewage flows down through the upper water distribution pipe 80. After passing through the modular filler area 40, the sewage is collected by the bottom water collection pipe arrangement layer 90 and discharged to the water distribution pipe 80 set in the secondary filler unit 500 on the downstream side. Then, the sewage flows through each secondary filler unit 500 and finally flows into the outlet channel 20.

[0032] Specifically, the modular filler area 40 can be arranged in layers. The height of the upper modular filler is 840 mm, and the thickness of a single modular biomass filler used is 120 mm. The height of the lower modular filler is 110 mm, and the thickness of a single modular biomass filler used is 55 mm. Aquatic plants can be arranged above the upper modular filler.

[0033] In this embodiment, when the artificial wetland system is a vertical submerged flow type, Figure 1 As shown, the plurality of secondary packing units 500 are arranged in an array, and the number of the secondary packing units 500 in each row is at least 2, for example, 2, 3, etc. Two adjacent rows of secondary packing units 500 are connected through the water distribution pipe 80 and the water collecting pipe arrangement layer 90, and the secondary packing units 500 in the last row are connected to the water outlet pipe through the water collecting pipe arrangement layer 90.

[0034] The water distribution pipe 80 provided in the first row of secondary packing units 500 is connected to the water collecting pipe arrangement layer 90 of the primary packing unit 400. In this way, the sewage of the primary packing unit 100 can flow into the first row of secondary packing units 500. The subsequent secondary packing units 500 are also configured in the above manner. Then, the sewage flows from the water collecting pipe arrangement layer 90 of the secondary packing unit 500 into the water distribution pipe 80 of the secondary packing unit 500 on the downstream side.

[0035] In this embodiment, when the artificial wetland system is a vertical submerged flow type, Figure 3 As shown, each secondary filling unit 500 includes a secondary supporting wall 510, and the area enclosed by the secondary supporting wall 510 is provided with an upper modular filling area 40A, a biomass filling layer and a lower modular filling area 40B in sequence from top to bottom. A plurality of modular biomass fillers are arranged in an array in the upper modular filling area 40A, and a plurality of modular biomass permeable bricks are arranged in an array in the lower modular filling area 40B. The height of the upper modular filling area 40A is less than the height of the lower modular filling area 40B, and the thickness of the modular biomass fillers in the upper modular filling area 40A is greater than the thickness of the modular biomass permeable bricks in the lower modular filling area 40B. The biomass filler layers are arranged in layers, and the particle size of the upper biomass filler 66 is greater than the particle size of the lower biomass filler 67. A water collecting pipe arrangement layer 90 is arranged at the bottom of the lower modular filling area 40B.

[0036] Specifically, the height of the upper modular filler area 40A is 120 mm, and the thickness of the single modular biomass filler used is 120 mm. Aquatic plants can be arranged above the upper modular filler area 40A. The height of the lower modular filler area 40B is 165 mm. The thickness of the single modular biomass permeable brick used is 55 mm. The overall height of the biomass filler 66 of the upper layer is 350 mm, and the particle size of the filler is 20-30 mm. The overall height of the biomass filler 67 of the lower layer is 365 mm, and the particle size of the filler is 5-10 mm.

[0037] In the specific design, when the above artificial wetland system is a vertical submerged flow type, such as Figure 1As shown in the figure, the packing height of the first packing unit 400 is designed to be 0.95m, and the total packing height of the secondary packing unit 500 is 1m. The comprehensive porosity of the packing of each treatment unit is 40%, and the COD Cr The surface pollution load is 15 g / (m 2 ▪d), the ammonia nitrogen surface pollution load is 6g / (m 2 ▪d), the total phosphorus surface pollution load is taken as 0.4g / (m 2 ▪d), the total nitrogen surface pollution load is 8g / (m 2 ▪d), S=10000*(15-1.5) / 8=16875m, hydraulic load is 0.3 m 3 / (m 2 ▪d), the design area is determined to be 33500 m 2 , and use the residence time for calibration: t=33500*1*40% / 10000=1.34d, which meets the requirements.

[0038] The design size of each packing unit is L×B×H=50m×24m×1m=1200m 3 . The number of packing units is 28. Water inlet design: (1) Taking into account the high initial wetland treatment concentration and the cost of modular packing, the present invention uses large modular packing placed in the first-level packing unit 400. (2) After the first-level packing unit 400 discharges water, its effluent is evenly distributed to the subsequent first-row secondary packing units 500 in a downstream manner. Main packing design: Considering that the blockage of artificial wetlands mainly occurs at 0-15cm around the water distribution system, and considering the load-bearing capacity of the lower layer of packing, the thickness of the modular biomass packing used in the upper layer of each packing unit is designed to be 120mm. In order to enhance the phosphorus removal of wetland effluent and taking into account the laying of the effluent pipe at the bottom of the wetland, 165mm thick modular biomass permeable bricks are laid at the bottom of each secondary packing unit 500, see attached. Figure 3 .

[0039] The advantages of the above-mentioned vertical submerged flow artificial wetland system are: 1. The first-level filler unit 400 of this system all uses modular fillers. After the first section of the filler in the wetland is blocked, it is easy to remove and clean for reuse. 2. The modular filler technology at the lower end of the water distribution pipe adopted in this system can be easily removed after the wetland is blocked, and the filler can be reused, saving a lot of workload and secondary investment costs. 3. In the bottom water collection system of this system, modular fillers are used instead of granular fillers, which saves the use of collecting branches, avoids blockage of the collecting port of the collecting branch, and avoids problems such as rupture of the branch due to extrusion. 4. This system clearly specifies the pollutant removal load, and all are higher than the traditional actual design values. 5. Its effluent quality can meet the surface quasi-fourth category water standard.

[0040] In summary, the present invention has the following advantages:

[0041] 1. It can delay the clogging of wetlands.

[0042] 2. The filler is easy to replace and can be reused.

[0043] 3. Save the usage of drainage collection system pipes and avoid the pipe collection port being blocked by granular fillers.

[0044] 4. Save at least 40% of floor space

[0045] 5. Save at least 30% of secondary investment.

[0046] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A vertical submerged modular constructed wetland treatment system, characterized in that: The invention comprises a primary packing unit and a plurality of secondary packing units located at the downstream side of the primary packing unit, wherein the primary packing unit and the plurality of secondary packing units are sequentially connected through a water distribution unit, the primary packing unit is provided with a modular packing area, one end of the modular packing area is provided at the water inlet end of the primary packing unit, a plurality of modular packings are arranged in an array in the modular packing area, the water distribution unit comprises a plurality of water distribution pipes and a plurality of water collecting pipe arrangement layers, the primary packing unit comprises a primary support wall, the primary support wall encloses the modular packing area, each modular packing in the modular packing area is a modular biomass packing, a water distribution pipe is provided at the top of the modular packing area, a water collecting pipe arrangement layer is provided at the bottom of the modular packing area, the plurality of secondary packing units are arranged in an array, the number of secondary packing units in each row is at least 2, two adjacent rows of secondary packing units are connected through a water distribution pipe and a water collecting pipe arrangement layer, and the secondary packing units in the last row are connected to the outlet pipe through the water collecting pipe arrangement layer, Each secondary packing unit includes a secondary supporting wall, and the area enclosed by the secondary supporting wall is provided with an upper modular packing area, a biomass packing layer and a lower modular packing area from top to bottom. A plurality of modular biomass packings are arranged in the upper modular packing area, and a plurality of modular biomass permeable bricks are arranged in the lower modular packing area. The height of the upper modular packing area is less than the height of the lower modular packing area, and the thickness of the modular biomass packing in the upper modular packing area is greater than the thickness of the modular biomass permeable bricks in the lower modular packing area. The biomass packing layers are arranged in layers, and the particle size of the biomass packing in the upper layer is greater than the particle size of the biomass packing in the lower layer. A water distribution pipe is arranged above the upper modular packing area, and a water collecting pipe arrangement layer is arranged at the bottom of the lower modular packing area.

2. The vertical submerged modular constructed wetland treatment system according to claim 1, characterized in that: The number of secondary packing units in each row is 3.

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