Tail water wetland of prefabricated basalt fiber net combined straw carbon source balls

Abstract

The tail water wetland comprises a carbon source contact area and an artificial wetland area, the front part of the carbon source contact area is provided with a water collecting area, the upper part of the front side of the water collecting area is connected with a water inlet pipe, and the water collecting area is internally provided with a water passing weir, so that preliminary precipitation separation of tail water can be realized; a water passing hole A is formed below the joint of the carbon source contact area and the water collecting area, low-carbon-nitrogen-ratio tail water accumulated in the water collecting area enters the carbon source contact area through the water passing hole A. An artificial wetland area is arranged on the rear portion of the carbon source contact area, and two rows of water passing holes B are formed in the upper portion of the rear side of the carbon source contact area. The tail water to be treated primarily reacts with microorganisms attached to the mesh cage woven by the basalt fibers in the carbon source contact area and fully contacts with the biological carbon source balls, and then flows out from the water passing holes B and enters the artificial wetland area. According to the invention, the problem that the carbon source of the tail water of a sewage plant is insufficient and further the decontamination performance of the artificial wetland is influenced is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of organic sewage (waste) water treatment, and in particular relates to a tailwater wetland of prefabricated basalt fiber net combined with straw carbon source balls. Background Art

[0002] As a sewage treatment technology with both economic and ecological benefits, artificial wetlands have received extensive attention in recent years. It effectively removes pollutants from sewage by simulating the physical, chemical and biological processes in natural wetland ecosystems. Artificial wetlands have the advantages of low cost, low energy consumption and good treatment effect. They are suitable for treating various types of sewage, such as urban domestic sewage, agricultural runoff, industrial wastewater, landfill leachate, etc., and can also be used for in-situ remediation of water bodies such as rivers and lakes. It has a wide range of applications. It can not only effectively remove nutrients such as organic matter, nitrogen and phosphorus, but also reduce the content of heavy metals and pathogens. It also shows excellent degradation potential for some emerging persistent organic matter. With increasingly stringent environmental regulations, the role of artificial wetlands in treating sewage plant tailwater has gradually become prominent, providing a new solution for further reducing the pollution concentration of sewage plant effluent and protecting the water environment.

[0003] Tailwater treatment is the last step in the sewage treatment process, which aims to ensure that the treated water quality meets the discharge standards or can be used for recycled water. Although artificial wetlands can effectively treat a variety of pollutants in sewage, there are still some challenges in tailwater treatment. Among them, insufficient carbon source is one of the main factors affecting the denitrification effect. In the denitrification process, denitrifying bacteria need sufficient carbon source to convert nitrate and nitrite into nitrogen gas, and the available carbon source content in many tailwaters is low, which limits the denitrification process. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a tailwater wetland composed of a prefabricated basalt fiber mesh combined with straw carbon source balls, so as to solve the problem of insufficient carbon source in the tailwater of sewage treatment plants, which in turn affects the further decontamination performance of artificial wetlands.

[0005] To achieve the above object, the present invention provides the following technical solutions: A tailwater wetland with a prefabricated basalt fiber net combined with a straw carbon source ball, comprising a carbon source contact area and an artificial wetland area, wherein a water collection area is arranged in front of the carbon source contact area, and a water inlet pipe is connected to the upper front side of the water collection area, and tailwater to be treated enters from the water inlet pipe and accumulates in the water collection area, and a water weir is arranged inside the water collection area to achieve preliminary precipitation and separation of the tailwater, and a water hole A is arranged below the connection between the carbon source contact area and the water collection area, and the low carbon-nitrogen ratio tailwater accumulated in the water collection area enters the carbon source contact area through the water hole A; A plurality of mesh cages woven from basalt fibers are embedded in the carbon source contact area and arranged in a matrix. Each mesh cage woven from basalt fibers undergoes a preliminary microbial culture and acclimatization phase before assembly to ensure that the biofilm is attached to the mesh cage woven from basalt fibers. A plurality of prefabricated biological carbon source balls are hung inside each mesh cage woven from basalt fibers. An artificial wetland area is arranged at the rear of the carbon source contact area, and two rows of water holes B are opened on the upper rear side of the carbon source contact area. After the tail water to be treated has a preliminary reaction with the microorganisms attached to the mesh cage woven with basalt fibers in the carbon source contact area and is in full contact with the biological carbon source balls, it flows out from the water holes B and enters the artificial wetland area.

[0006] The present invention further defines the technical solution: Furthermore, the mesh cage woven from basalt fibers is prismatic in shape, with a stainless steel wire mesh as a framework.

[0007] Furthermore, the basalt fiber woven mesh cage comprises a top cover (9) and a mesh cage body, and the top cover (9) and the mesh cage body (10) are connected by a quick-connect connector.

[0008] Furthermore, the biocarbon source balls are prepared from straws, and the biocarbon source balls can be fixed in series on nylon ropes, the top of the nylon ropes are connected to stainless steel hooks, and the stainless steel hooks are hung on the top cover of each layer of basalt fiber woven mesh cage.

[0009] Furthermore, the basalt fiber mesh cage is woven from basalt fibers modified by metal ions of calcium or magnesium.

[0010] Furthermore, a movable cover plate is provided above the carbon source contact area.

[0011] Furthermore, the artificial wetland area is filled with substrates of different particle sizes from top to bottom, and emergent plants are planted in the upper substrate. The tail water to be treated is treated under the synergistic action of the substrate, plants and microorganisms in the artificial wetland area, and finally discharged from the outlet pipe set at the upper end of the tail of the artificial wetland area.

[0012] Working principle: The present invention sets a water collection area, which can accumulate and store the tail water to be treated, and the water weir also has a preliminary separation and precipitation process. The present invention prepares agricultural waste material straw into a spherical biological carbon source, which is suspended in the carbon source contact pool in front of the artificial wetland. After the tail water with low carbon-nitrogen ratio is fully contacted with the biological carbon source ball, the carbon source is supplemented, the carbon-nitrogen ratio is improved, and biological denitrification, especially the denitrification process, can be effectively promoted. At the same time, the basalt fiber woven cage structure has a certain structural stability, which not only effectively prevents the loss of carbon source, but also can contact with the biofilm attached to the basalt fiber carrier while the water to be treated is fully contacted with the biological carbon source ball, and realizes the preliminary treatment reaction under the action of microorganisms; at the same time, the basalt fiber in the shape of the cage can realize the preliminary filtration and impurity interception of the water to be treated, thereby reducing the risk of subsequent artificial wetland matrix layer blockage, and the water to be treated after the preliminary reaction of microorganisms and the full supplement of carbon source then enters the artificial wetland area, and fully reacts under the physical, chemical and biological effects such as wetland matrix adsorption, plant absorption, microbial assimilation and alienation, and deeply purifies the water quality of the tail water, thereby further reducing the environmental risk of the effluent.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention sets up a carbon source contact pool, which is small in size, simple in structure, and easy to maintain. Compared with other artificial wetland enhancement measures, it saves more construction and operation costs; (2) Based on the excellent physical and chemical properties of basalt fiber such as high strength, corrosion resistance, and large specific surface area, as well as the advantages of biocompatibility and microbial attachment, the present invention prepares basalt fiber into a mesh shape, which can effectively fix the carbon source and prevent the loss of biological carbon source to achieve the initial reaction of microorganisms. At the same time, the mesh basalt fiber can achieve the initial filtration and interception function of the water to be treated, effectively reducing the risk of blockage in the filter area of ​​the artificial wetland; (3) The present invention uses stainless steel wire to filter the water. The net is the skeleton, and basalt fibers are woven on the skeleton, which has better structural stability and impact load resistance; (4) The present invention can treat and assemble a single-layer basalt fiber mesh cage and a biological carbon source ball as a whole. The mesh cage is a container for hanging and accommodating the biological carbon source. The number of basalt fiber mesh cages can be changed according to the specific carbon-nitrogen ratio of the water to be treated, and the carbon source content of the carbon source contact pool can be flexibly changed; (5) The present invention prefabricates the biological carbon source prepared from straw into a spherical shape, which is suspended on the top cover of the basalt fiber mesh cage by a nylon rope. The number of biological carbon source balls in each layer of the mesh cage can be changed as needed, thereby further fine-tuning the supplementary carbon source content and concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 AA cross-section of the medium carbon source contact pool; Figure 3 for Figure 1AA profile of water flow in and out of the medium carbon source contact pool; Figure 4 for Figure 1 Section BB of the middle artificial wetland; Figure 5 A schematic diagram of the structure of a mesh cage woven with a single layer of basalt fibers according to the present invention; Figure 6 A schematic diagram of the structure of a mesh cage layer woven with multiple layers of basalt fibers according to the present invention; Figure 7 This is a diagram showing the dynamic changes in the denitrification performance of each system in the three stages in Example 1. DETAILED DESCRIPTION

[0015] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0016] Example 1 See also Figure 1-6 A tailwater wetland with a prefabricated basalt fiber net combined with a straw carbon source ball, comprising a carbon source contact area 2 and an artificial wetland area 3, a water collection area 1 is arranged in front of the carbon source contact area, a water weir 18 is arranged inside the water collection area 1, and the tailwater to be treated flows in from the water inlet pipe above the front end of the water collection area, accumulates in the water collection area, and then flows through the water weir inside the water collection area to achieve preliminary precipitation and separation of impurities; a water hole A5 is opened below the connection between the carbon source contact area 2 and the water collection area, and the low carbon-nitrogen ratio tailwater accumulated in the water collection area 1 enters the carbon source contact area 2 through the water hole A5; A plurality of prismatic mesh cages 6 woven from basalt fibers are embedded in the carbon source contact area 2. The mesh cages 6 woven from basalt fibers have a stainless steel wire mesh 7 as a skeleton and have excellent structural support performance. The mesh cages woven from basalt fibers undergo a preliminary microbial culture and acclimatization stage before assembly to ensure that the biofilm is attached to the mesh cages. The basalt fiber woven mesh cage 6 comprises a top cover 9 and a mesh cage body 10, and the top cover 9 and the mesh cage body 10 are connected by a quick-plug connector 11; in addition, the basalt fiber woven mesh cage (6) can be woven into different height sizes according to the size of the stainless steel wire mesh (7) skeleton, and the number of mesh cages and the number of installation layers can be adjusted according to the water quality of the inlet water; A plurality of prefabricated bio-carbon source balls 8 are suspended inside the basalt fiber woven mesh cage 6. The bio-carbon source balls 8 are made of straw and can be fixed in series on a nylon rope 12. The top of the nylon rope 12 is connected to a stainless steel hook 13, and the stainless steel hook 13 is suspended on the top cover 9 of each layer of the basalt fiber woven mesh cage 6. The single-layer basalt fiber woven mesh cage 6 and the suspended bio-carbon source balls 8 can be used as an assembled whole and installed layer by layer inside the carbon source contact area 2 according to the water quality requirements of the inlet water. The basalt fiber woven mesh cage 6 can be woven from modified basalt fibers to improve hydrophilicity and biological adhesion, such as metal ion calcium and magnesium modification. Two rows of water holes B14 are opened on the upper rear side of the carbon source contact area 2. After the tail water to be treated has a preliminary reaction with the microorganisms attached to the mesh cage 6 woven with basalt fibers in the carbon source contact area and fully contacts the biological carbon source balls 8, it flows out from the water holes B14 and enters the artificial wetland area 3. A movable cover plate 19 is provided above the carbon source contact area 2. When the system is running, the cover plate can be covered to maintain a good anoxic environment in the carbon source contact area 2, which is conducive to the denitrification. The artificial wetland area 3 is filled with substrates 15 of different particle sizes from top to bottom, and emergent plants 16 are planted in the upper substrate. The tail water to be treated is treated under the synergistic effect of the substrate, plants and microorganisms in the artificial wetland area 3, and finally discharged from the outlet pipe 17 at the upper end of the tail of the artificial wetland area 3.

[0017] The combined basalt fiber cage carbon source contact pool and artificial wetland system in this embodiment were used for testing to verify the structural functionality of the system and its strengthening effect on tailwater purification, especially the strengthening effect on denitrification. In this case, basalt fiber was woven into a cage after calcium modification and embedded in the carbon source contact pool. A total of four systems were designed, with 0, 1, 2 and 3 layers of basalt fiber cages embedded respectively, and the corresponding device numbers were CW1, CW2, CW3 and CW4.

[0018] During the entire test phase, each system was operated for 82 days, which can be divided into three stages, and the hydraulic retention time was 2 days (48 hours). In the first stage (0-26 days), after the combined system was stably operated, the initial tailwater carbon-nitrogen ratio was 2 (COD=40 mg / L). In order to investigate the further enhancement effect of adding different carbon source ball contents on the denitrification performance of basalt fiber constructed wetlands, 5 straw biocarbon source balls were hung in the top basalt fiber mesh cage in the second stage (26-56 days), and 10 straw biocarbon source balls were hung in the top basalt fiber mesh cage in the third stage (56-82 days), so as to adjust the carbon-nitrogen ratio of the second and third stages and achieve the effect of enhanced denitrification.

[0019] Note: This experiment only examines the effect of changes in the number of carbon source balls in a single-layer basalt fiber mesh cage. In practical applications, the number of carbon source balls in each layer of basalt fiber mesh cage can be flexibly adjusted.

[0020] The experimental design of the influent and operating parameters, nitrogen-containing pollutant removal data are shown in Tables 1 to 6, and the results are shown in Figure 7 .

[0021] Table 1 Theoretical concentrations of influent pollutants and some operating parameters at different operation stages

[0022] Table 2 Ammonia nitrogen, nitrate nitrogen and total nitrogen concentrations in the inlet and outlet water of each system at different operation stages (mg / L)

[0023] Table 3 Removal rates of ammonia nitrogen, nitrate nitrogen and total nitrogen in each system at different operation stages (%)

[0024] Table 4 Ammonia nitrogen inlet and outlet water concentration and removal rate of each system in Example 1 (%)

[0025] Table 5 Inlet and outlet water concentration and removal rate of nitrate nitrogen in each system of Example 1 (%)

[0026] Table 6 Total nitrogen inlet and outlet water concentration and removal rate of each system in Example 1 (%)

[0027] (1) Comparison of ammonia nitrogen removal rate like Figure 7In (a) and Table 2, when no carbon source balls were added, the average influent NH4+-N concentration was 8.14±0.20 mg / L, and the effluent concentrations of CW1-4 were 2.21±0.13 mg / L, 2.46±0.29 mg / L, 2.91±0.29 mg / L and 3.10±0.29 mg / L, respectively, with corresponding removal rates of 72.81±1.97%, 69.75±3.78%, 64.18±3.77% and 61.85±3.65%. When 5 carbon source balls were hung, the average influent NH4+-N concentration was 8.42±0.14 mg / L, and the effluent concentrations of CW1-4 were 1.84±0.30 mg / L, 1.88±0.15 mg / L, 2.56±0.24 mg / L and 2.32±0.19 mg / L, respectively, with corresponding removal rates of 78.08±3.48%, 77.64±1.76%, 69.55±2.67% and 72.39±2.17%. When 10 carbon source balls were hung, the average influent NH4+-N concentration was 8.37±0.15 mg / L, and the effluent concentrations of CW1-4 were 1.48±0.13 mg / L, 1.56±0.18 mg / L, 1.89±0.16 mg / L, and 1.87±0.20 mg / L, respectively, with corresponding removal rates of 82.31±1.49%, 81.31±2.18%, 77.38±1.91%, and 77.59±2.29%. The above results show that with the introduction of biological carbon source balls and the increase in C / N values, the NH4+-N removal rates of each group of wetlands have increased. Note that the original data of ammonia nitrogen that was not analyzed at this stage are shown in Table 5.

[0028] (2) Comparison of nitrate nitrogen removal rate like Figure 7In (b) and Table 2, when no carbon source balls were added, the average inlet NO3--N concentration was 12.30±0.25 mg / L, and the effluent concentrations of CW1-4 were 13.87±0.83 mg / L, 11.04±1.23 mg / L, 12.01±1.41 mg / L and 10.15±1.43 mg / L, respectively, with corresponding removal rates of -12.77±7.23%, 10.20±10.49%, 2.23±12.54% and 17.45±12.04%. When 5 carbon source balls were hung, the average inlet NO3--N concentration was 12.63±0.35 mg / L, and the effluent concentrations of CW1-4 were 12.92±1.32 mg / L, 9.19±1.61 mg / L, 9.58±1.61 mg / L and 8.34±1.37 mg / L, respectively, with corresponding removal rates of -2.35±10.70%, 27.20±13.17%, 24.09±13.35% and 33.85±11.64%. When 10 carbon source balls were hung, the average inlet NO3--N concentration was 12.59±0.17 mg / L, and the outlet concentrations of CW1-4 were 9.09±1.11 mg / L, 6.17±1.55 mg / L, 5.97±0.80 mg / L and 4.90±1.04 mg / L, respectively, with corresponding removal rates of 27.80±8.64%, 51.07±12.11%, 52.55±6.49% and 61.11±8.18%.

[0029] When no carbon source balls were added, the carbon source was obviously insufficient, and the NO3--N in the influent and the NO3--N converted from nitrification could not be effectively converted, resulting in a high NO3--N effluent concentration in each group of wetlands. This phenomenon was most obvious in CW1. At this stage, the denitrification level of CW2-4 was higher than that of CW1, indicating that when the carbon source was insufficient, the basalt fiber cage had the ability to enhance wetland denitrification. Overall, as the number of suspended carbon source balls increased, the C / N value increased, and the NO3--N removal rate of each group of wetlands increased significantly. When 5 carbon source balls were hung, the removal rate of the control group wetland was improved, but the NO3--N effluent concentration was still higher than the influent concentration. Compared with the control group, the embedded basalt fiber cage significantly improved the removal of NO3--N. When 10 carbon source balls were hung, the basalt fiber had the most obvious effect on the removal of NO3--N. Among them, CW4 had the largest removal rate, which was 33.31% higher than the control group ( p<0.05 ). Note: Nitrate nitrogen was not analyzed at this stage. See Table 6 for the raw data.

[0030] (3) Comparison of total nitrogen removal rate like Figure 7In (c) and Table 2, when no carbon source balls were added, the average TN concentration of the influent was 20.56±0.29 mg / L, and the effluent concentrations of CW1-4 were 16.60±0.89 mg / L, 14.01±0.86 mg / L, 15.20±1.16 mg / L and 13.79±1.35 mg / L, respectively, with corresponding removal rates of 18.85±4.63%, 31.28±4.44%, 25.42±5.97% and 32.33±6.83%. When 5 carbon source balls were hung, the average influent TN concentration was 21.11±0.42 mg / L, and the effluent concentrations of CW1-4 were 15.07±1.29 mg / L, 12.68±1.37 mg / L, 13.21±1.57 mg / L and 12.48±1.40 mg / L, respectively, with corresponding removal rates of 28.66±5.78%, 39.97±6.14%, 37.44±7.20% and 40.89±6.39%. When 10 carbon source balls were hung, the average inlet TN concentration was 21.16±0.35 mg / L, and the effluent concentrations of CW1-4 were 11.84±1.67 mg / L, 10.15±2.07 mg / L, 9.82±1.67 mg / L and 8.79±1.84 mg / L, respectively, with corresponding removal rates of 44.09±7.61%, 52.13±9.49%, 53.65±7.72% and 58.52±8.50%.

[0031] Overall, the removal trend of TN is similar to that of NO3--N, because denitrification is the limiting step of denitrification when the carbon source is insufficient. The embedded basalt fiber cage has the effect of promoting TN removal before and after adding carbon source balls, and this promotion effect is most obvious in CW4 with three layers of embedded basalt fiber cages. In the three stages, the TN removal rate of CW4 increased by 13.48% ( p < 0.05 )、12.23%( p < 0.05 ) and 14.43% ( p < 0.05 At the same time, the TN removal rate of each system was significantly improved after the biological carbon source balls were hung ( p < 0.05 ), and the degree of improvement is positively correlated with the number of suspensions, which proves that the biological carbon source ball can effectively enhance the denitrification performance of the combined system. Note: The total nitrogen raw data was not analyzed in this stage. See Table 6.

[0032] (4) Changes in effluent turbidity As shown in Table 7, in addition to the strengthening effect of basalt fiber on nutrient removal performance through attached biofilm, in order to further investigate the initial separation and sedimentation effect of basalt fiber cages on wastewater treatment, water samples from a river in Nanjing were collected for 8 consecutive months, and the average turbidity of the water samples was measured to be 23.41±5.99 NTU. The river water samples were used as the influent of the combined artificial wetland system, and the water quality of the surface water of each system artificial wetland was periodically tested (i.e., after passing through the carbon source contact tank and before passing through the wetland filtration tank). The results showed that the turbidity of the effluent from the carbon source contact pool / overlying water of the artificial wetland of the four devices CW1, CW2, CW3, and CW4 were 15.58±1.46 NTU, 8.36±2.10 NTU, 6.32±0.74 NTU, and 5.25±1.05 NTU, respectively. The order of turbidity from large to small was CW1>CW2>CW3>CW4, which indicated that the presence of basalt fiber cages also had the function of preliminary separation and filtration of impurities, and the number of cages was proportional to the water purification performance within a certain range.

[0033] Table 7 Turbidity of water inlet and outlet of a river in Nanjing after passing through various systems

[0034] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A tailwater wetland of prefabricated basalt fiber net combined with straw carbon source balls, comprising a carbon source contact area (2) and an artificial wetland area (3), characterized in that: A water collection area (1) is arranged in front of the carbon source contact area (2), and a water inlet pipe (4) is connected to the upper front side of the water collection area (1). Tail water to be treated enters from the water inlet pipe (4) and is accumulated in the water collection area (1). A water weir (18) is arranged inside the water collection area (1) to achieve preliminary sedimentation and separation of the tail water. A water hole A (5) is arranged below the connection between the carbon source contact area (2) and the water collection area, and the low carbon-nitrogen ratio tail water accumulated in the water collection area (1) enters the carbon source contact area (2) through the water hole A (5); A plurality of mesh cages (6) woven from basalt fibers are embedded in the carbon source contact area (2) and arranged in a matrix. Each mesh cage (6) woven from basalt fibers undergoes a preliminary microbial culture and acclimatization phase before assembly to ensure that the biofilm is attached to the mesh cage (6) woven from basalt fibers. A plurality of prefabricated biological carbon source balls (8) are suspended inside each mesh cage (6) woven from basalt fibers. An artificial wetland area (3) is arranged at the rear of the carbon source contact area (2), and two rows of water holes B (14) are opened on the upper rear side of the carbon source contact area (2). After the tail water to be treated undergoes a preliminary reaction with the microorganisms attached to the mesh cage (6) woven with basalt fibers in the carbon source contact area and fully contacts with the biological carbon source balls (8), it flows out from the water holes B (14) and enters the artificial wetland area (3).

2. The tailwater wetland of the prefabricated basalt fiber net combined with straw carbon source balls according to claim 1, characterized in that: The basalt fiber woven mesh cage (6) is prism-shaped and has a stainless steel wire mesh (7) as a framework.

3. The tailwater wetland of the prefabricated basalt fiber net combined with straw carbon source balls according to claim 2, characterized in that: The basalt fiber woven mesh cage (6) comprises a top cover (9) and a mesh cage body (10), and the top cover (9) and the mesh cage body (10) are connected by a quick-connect connector (11).

4. The tailwater wetland of the prefabricated basalt fiber net combined with straw carbon source balls according to claim 2, characterized in that: The biocarbon source balls (8) are made of straw and can be fixed in series on a nylon rope (12). The top of the nylon rope (12) is connected to a stainless steel hook (13), and the stainless steel hook (13) is hung on the top cover (9) of each layer of the basalt fiber woven mesh cage (6).

5. The tailwater wetland of prefabricated basalt fiber net combined with straw carbon source ball according to claim 2, characterized in that: The basalt fiber woven mesh cage (6) is woven from basalt fibers modified with metal ions of calcium or magnesium.

6. The tailwater wetland of prefabricated basalt fiber net combined with straw carbon source balls according to claim 1, characterized in that: A movable cover plate (19) is provided above the carbon source contact area (2).

7. The tailwater wetland of prefabricated basalt fiber net combined with straw carbon source balls according to claim 1, characterized in that: The artificial wetland area (3) is filled with an upper matrix layer, a basalt fiber layer, a middle matrix layer and a bottom matrix layer from top to bottom, wherein the matrix (15) of the upper matrix layer, the middle matrix layer and the bottom matrix layer have different particle sizes, and emergent plants (16) are planted in the upper matrix layer. The tail water to be treated is treated under the synergistic effect of the matrix, plants and microorganisms in the artificial wetland area (3), and finally discharged from the outlet pipe (17) arranged at the upper end of the tail of the artificial wetland area (3).

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