Baffling wetland filter tank and lateral subsurface flow wetland bed sewage treatment system and method

Abstract

The invention provides a baffling wetland filter tank and lateral subsurface flow wetland bed sewage treatment system and method, and relates to the field of sewage treatment. The sewage treatment system comprises one-stage or multi-stage subsurface flow wetland beds, a sand soil layer, a ceramsite layer, a microbial decomposition layer, a soil loosening layer and a water locking layer are sequentially arranged in each stage of subsurface flow wetland bed from bottom to top, and wetland vegetation is planted in the soil loosening layer and the water locking layer; a connecting pipeline is arranged on one side of the subsurface flow wetland bed, a screening net is arranged in the connecting pipeline, the subsurface flow wetland bed is connected with a wetland filter tank through the connecting pipeline, and submerged plants and emergent aquatic plants are arranged in the wetland filter tank. By combining the constructed wetland treatment system and the aquatic plant system, nitrogen and phosphorus in sewage can be effectively removed, the utilization rate of filler in the sewage treatment system is increased, and the sewage can be effectively purified.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and specifically to a sewage treatment system and method of a baffle wetland filter + lateral subsurface flow wetland bed. Background Art

[0002] Rural domestic sewage is characterized by a large total amount, scattered discharge, high pollution degree, large changes in water volume and quality, and being far from municipal sewage pipelines and large sewage treatment plants. Generally, it is discharged into nearby rivers and lakes without any treatment, causing serious environmental pollution. Therefore, rural domestic sewage has become an important factor in the pollution of natural water bodies, and a small-scale water purification process technology suitable for the characteristics of rural domestic sewage has become an urgent need.

[0003] The artificial wetland water purification system has advantages such as simple process, low energy consumption, and being convenient for decentralized construction and management. It is particularly suitable for the current situation of sewage treatment in rural areas and small and medium-sized towns in China, and has become one of the optimal processes for rural domestic sewage treatment. However, due to the relatively short research time on artificial wetlands in China, there are still many deficiencies in the actual application process, such as long sewage residence time, easy blockage of wetlands, low dissolved oxygen inside, easy formation of dead zones, large floor area, poor phosphorus and nitrogen removal effects, etc. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a sewage treatment system and method of a baffle wetland filter + lateral subsurface flow wetland bed, which solves the problems of easy blockage of wetlands and poor phosphorus and nitrogen removal effects in the application of existing artificial wetlands.

[0006] (2) Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A sewage treatment system of a baffle wetland filter + lateral subsurface flow wetland bed, including a subsurface flow wetland bed, the subsurface flow wetland bed is set to be one-level or multi-level, and inside each level of the subsurface flow wetland bed, a sand layer, a ceramsite layer, a microbial decomposition layer, a loose soil layer, and a water-locking layer are sequentially arranged from bottom to top. Wetland vegetation is planted inside the loose soil layer and the water-locking layer;

[0008] A connecting pipe is arranged on one side of the subsurface flow wetland bed, a screening net is arranged inside the connecting pipe, the subsurface flow wetland bed is connected to a wetland filter through the connecting pipe, a first support is fixedly connected to the middle of the wetland filter, submerged plants are arranged inside the first support, a second support is fixedly connected inside the wetland filter and above the first support, a support basin is movably connected inside the second support, and emergent plants are arranged inside the support basin.

[0009] Preferably, the plants in the wetland vegetation are set to be one of reed, canna, cattail, cyperus alternifolius, calamus, and wild rice stem.

[0010] Preferably, after each layer of filler is laid in the subsurface flow wetland bed, solid specific strain powder or high-efficiency low-carbon source phosphorus and nitrogen removal filler is placed on the surface of the filler. The solid specific strain powder includes high-efficiency aerobic, facultative anaerobic, anaerobic, nitrifying, and denitrifying bacteria.

[0011] Preferably, a sewage pipe is arranged on one side of the subsurface flow wetland bed. The output end of the sewage pipe is fixedly connected with a second water outlet pipe and a first water outlet pipe. A plurality of water outlet holes are arranged on the outer side walls of the second water outlet pipe and the first water outlet pipe. The first water outlet pipe extends into the inside of the ceramsite layer, and the second water outlet pipe extends into the inside of the loose soil layer.

[0012] Preferably, the thickness of the sandy soil layer is 30 cm to 40 cm, the thickness of the ceramsite layer is 15 cm to 25 cm, the thickness of the microbial decomposition layer is 30 cm to 40 cm, strains are arranged inside the microbial decomposition layer, the thickness of the loose soil layer is 15 cm to 30 cm, earthworms are arranged inside the loose soil layer, and the water-locking layer is made of geotextile material.

[0013] Preferably, an aerator is fixedly connected inside the wetland filter and below the first support. A water pump is arranged at the bottom of the wetland filter, and the output end of the water pump is fixedly connected with a drain pipe.

[0014] Preferably, the emergent plants are one or several of lotus, loosestrife, cattail, reed, calamus, arrowhead, and yellow iris, and the submerged plants are one or several of potamogeton malaianus, myriophyllum verticillatum, hydrilla verticillata, vallisneria natans, ceratophyllum demersum, and potamogeton crispus.

[0015] A sewage treatment method for a baffle wetland filter + lateral subsurface flow wetland bed sewage treatment system, characterized by comprising the following steps:

[0016] First step, introduce the sewage into the loose soil layer through the second water outlet pipe, and use the artificial wetland biological system treatment system composed of the loose soil layer, microbial decomposition layer, ceramsite layer, sandy soil layer, and the roots of wetland vegetation arranged from top to bottom to treat the sewage;

[0017] Second step, the sewage treated by the artificial wetland biological system seeps into the wetland filter through the connecting pipe. The emergent plants and submerged plants can treat the sewage in the wetland filter, and the aerator can effectively increase the dissolved oxygen in the sewage and improve the microbial activity;

[0018] Third step, discharge the purified water through the water pump;

[0019] Step 4: Regularly backwash the ceramsite layer, microbial decomposition layer, and loose soil layer through the first water outlet pipe to prevent blockage.

[0020] (III) Beneficial effects

[0021] The present invention provides a baffle wetland filter + lateral subsurface flow wetland bed sewage treatment system and method. It has the following beneficial effects:

[0022] 1. The present invention combines an artificial wetland treatment system and an aquatic plant system to effectively purify sewage. On the one hand, the artificial wetland can preliminarily treat the sewage, convert high-molecular organic matter in the sewage into low-molecular organic matter, and absorb some nitrogen and phosphorus elements in the sewage, making the sewage in the aquatic plant system more suitable for the growth of aquatic plants. On the other hand, the aquatic plant system can absorb the remaining phosphorus and nitrogen, and through the synergistic degradation with microorganisms, the sewage can effectively improve the water environment.

[0023] 2. The preliminary treatment time of the sewage treated by the present invention is short, which can effectively avoid the accumulation of sewage inside the system; the two water outlet pipes can backwash the packing, and it is not easy to be blocked; the floor area is small and the use cost is low; through the combination of animals, plants, and microorganisms, nitrogen and phosphorus in the sewage can be effectively removed; the packing utilization rate in the sewage treatment system is high, and the sewage can be effectively purified. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the present invention.

[0025] Among them, 1. Subsurface flow wetland bed; 101. Sandy soil layer; 102. Ceramsite layer; 103. Microbial decomposition layer; 104. Loose soil layer; 105. Water-locking layer; 106. Wetland vegetation; 107. Connecting pipe; 1071. Screening net; 2. Wetland filter; 201. First support; 202. Submerged plant; 203. Second support; 204. Support basin; 205. Emergent plant; 206. Aerator; 207. Water pump; 3. Sewage pipe; 301. First water outlet pipe; 302. Second water outlet pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0027] Embodiment 1:

[0028] As Figure 1As shown in the figure, the embodiment of the present invention provides a baffle wetland filter + lateral subsurface flow wetland bed sewage treatment system and method, including a subsurface flow wetland bed 1, which is characterized in that: the subsurface flow wetland bed 1 is set to be one-level or multi-level, and the number of levels of the subsurface flow wetland bed can be selected according to the pollution situation of the sewage. Inside each level of the subsurface flow wetland bed 1, a sand layer 101, a ceramsite layer 102, a microbial decomposition layer 103, a loose soil layer 104, and a water-locking layer 105 are arranged in sequence from bottom to top. After each layer of filler is laid in the subsurface flow wetland bed 1, solid specific strain powder or high-efficiency low-carbon source phosphorus and nitrogen removal filler is placed on the surface of the filler. The solid specific strain powder includes high-efficiency aerobic, facultative anaerobic, anaerobic, nitrifying, and denitrifying bacteria. Wetland vegetation 106 is planted inside the loose soil layer 104 and the water-locking layer 105. The plants inside the wetland vegetation 106 are set to be one of reed, canna, cattail, water chestnut, calamus, and wild rice stem. A sewage pipe 3 is arranged on one side of the subsurface flow wetland bed 1. The output end of the sewage pipe 3 is fixedly connected with a second water outlet pipe 302 and a first water outlet pipe 301. A number of water outlet holes are arranged on the outer side walls of the second water outlet pipe 302 and the first water outlet pipe 301. The first water outlet pipe 301 extends into the ceramsite layer 102, and the second water outlet pipe 302 extends into the loose soil layer 104. The thickness of the sand layer 101 is 30 cm to 40 cm, the thickness of the ceramsite layer 102 is 15 cm to 25 cm, the thickness of the microbial decomposition layer 103 is 30 cm to 40 cm, strains are arranged inside the microbial decomposition layer 103, the thickness of the loose soil layer 104 is 15 cm to 30 cm, earthworms are arranged inside the loose soil layer 104, and the water-locking layer 105 is made of geotextile material.

[0029] A connecting pipe 107 is arranged on one side of the subsurface flow wetland bed 1. A screening net 1071 is arranged inside the connecting pipe 107. The subsurface flow wetland bed 1 is connected to a wetland filter 2 through the connecting pipe 107. A first support 201 is fixedly connected to the middle of the wetland filter 2. Submerged plants 202 are arranged inside the first support 201. A second support 203 is fixedly connected to the upper side of the first support 201 inside the wetland filter 2. A support basin 204 is movably connected inside the second support 203. Emergent plants 205 are arranged inside the support basin 204. An aerator 206 is fixedly connected to the lower side of the first support 201 inside the wetland filter 2. A water pump 207 is arranged at the bottom of the wetland filter 2. The output end of the water pump 207 is fixedly connected with a drain pipe. The emergent plants 205 are set to be one or several of lotus, loosestrife, cattail, reed, calamus, arrowhead, and yellow iris. The submerged plants 202 are set to be one or several of Potamogeton malaianus, Myriophyllum verticillatum, Hydrilla verticillata, Vallisneria natans, Ceratophyllum demersum, and Potamogeton crispus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The sewage treatment system of a baffle wetland filter + lateral subsurface flow wetland bed, including a subsurface flow wetland bed (1), is characterized in that: The subsurface flow wetland bed (1) is arranged in one or multiple levels. Inside each level of the subsurface flow wetland bed (1), a sandy soil layer (101), a ceramsite layer (102), a microbial decomposition layer (103), a loose soil layer (104), and a water-locking layer (105) are sequentially arranged from bottom to top. Wetland vegetation (106) is planted inside the loose soil layer (104) and the water-locking layer (105); One side of the subsurface flow wetland bed (1) is provided with a connecting pipe (107). A screening mesh (1071) is arranged inside the connecting pipe (107). The subsurface flow wetland bed (1) is connected to a wetland filter tank (2) through the connecting pipe (107). A first bracket (201) is fixedly connected to the middle of the wetland filter tank (2). Submerged plants (202) are arranged inside the first bracket (201). A second bracket (203) is fixedly connected inside the wetland filter tank (2) and above the first bracket (201). A support basin (204) is movably connected inside the second bracket (203). Emergent plants (205) are arranged inside the support basin (204).

2. The baffle wetland filter + lateral subsurface flow wetland bed sewage treatment system according to claim 1, characterized in that: The plants in the wetland vegetation (106) are set to be one of reed, canna, cattail, cyperus alternifolius, calamus, and wild rice stem.

3. The baffle wetland filter + lateral subsurface flow wetland bed sewage treatment system according to claim 1, wherein: After each layer of filler is laid in the subsurface flow wetland bed (1), solid specific strain powder or high-efficiency low-carbon source phosphorus and nitrogen removal filler is placed on the surface of the filler. The solid specific strain powder includes high-efficiency aerobic, facultative anaerobic, anaerobic, nitrifying, and denitrifying bacteria.

4. The baffle wetland filter + lateral subsurface flow wetland bed sewage treatment system according to claim 1, characterized in that: One side of the subsurface flow wetland bed (1) is provided with a sewage pipe (3). The output end of the sewage pipe (3) is fixedly connected with a second water outlet pipe (302) and a first water outlet pipe (301). A plurality of water outlet holes are arranged on the outer side walls of the second water outlet pipe (302) and the first water outlet pipe (301). The first water outlet pipe (301) extends into the ceramsite layer (102), and the second water outlet pipe (302) extends into the loose soil layer (104).

5. The baffle wetland filter + lateral subsurface flow wetland bed sewage treatment system according to claim 1, wherein: The thickness of the sandy soil layer (101) is 30 cm to 40 cm, the thickness of the ceramsite layer (102) is 15 cm to 25 cm, the thickness of the microbial decomposition layer (103) is 30 cm to 40 cm, strains are arranged inside the microbial decomposition layer (103), the thickness of the loose soil layer (104) is 15 cm to 30 cm, earthworms are arranged inside the loose soil layer (104), and the water-locking layer (105) is made of geotextile material.

6. The baffle wetland filter + lateral subsurface flow wetland bed sewage treatment system according to claim 1, wherein: An aerator (206) is fixedly connected inside the wetland filter tank (2) and below the first bracket (201). A water pump (207) is arranged at the bottom of the wetland filter tank (2). The output end of the water pump (207) is fixedly connected with a drain pipe.

7. The baffle wetland filter + lateral subsurface flow wetland bed sewage treatment system according to claim 1, characterized in that: The emergent plants (205) are one or several of lotus, lythrum salicaria, cattail, reed, calamus, sagittaria trifolia, and iris pseudacorus. The submerged plants (202) are one or several of potamogeton malaianus, myriophyllum verticillatum, hydrilla verticillata, vallisneria natans, ceratophyllum demersum, and potamogeton crispus.

8. The sewage treatment method of the sewage treatment system of a baffle wetland filter + lateral subsurface flow wetland bed according to claim 1, characterized in that: Including the following steps: Step 1: Introduce the sewage into the loose soil layer 104 through the second water outlet pipe 302, and treat the sewage by using the artificial wetland biological system composed of the loose soil layer 104, the microbial decomposition layer 103, the ceramsite layer 102, the sandy soil layer 101, and the roots of the wetland vegetation 106 arranged from top to bottom; Step 2: The sewage treated by the artificial wetland biological system seeps into the wetland filter tank 2 through the connecting pipe 107. The emergent plants 205 and the submerged plants 202 can treat the sewage in the wetland filter tank 2, and the aerator 206 can effectively increase the dissolved oxygen in the sewage and improve the microbial activity; Step 3: Discharge the purified water through the water pump 207; Step 4: Regularly backwash the ceramsite layer 102, the microbial decomposition layer 103, and the loose soil layer through the first water outlet pipe 301 to prevent blockage.

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