CN111762980A

CN111762980A - MABR constructed wetland device capable of being treated in enhanced mode

Info

Publication number: CN111762980A
Application number: CN202010687027.8A
Authority: CN
Inventors: 王冠平; 郭骐铭; 石伟; 陈晶; 李�杰
Original assignee: Everbright Water Shenzhen Co ltd; Everbright Water Technology Development Nanjing Co ltd
Current assignee: Everbright Water Shenzhen Co ltd; Everbright Water Technology Development Nanjing Co ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2020-10-13

Abstract

The invention belongs to the field of sewage treatment, and relates to an MABR constructed wetland device capable of performing enhanced treatment. The invention comprises a water treatment unit, an air supply pipeline and a buoyancy unit; the buoyancy unit provides buoyancy for the device, and the gas supply pipeline provides gas for the water treatment unit and the buoyancy unit; a penetration layer I with a certain thickness is arranged between the surface layer and the middle layer of the fiber membrane yarn, so that the use strength of the fiber membrane yarn is greatly improved. The MABR technical principle and the constructed wetland technical principle are coupled and improved to form the MABR constructed wetland device capable of strengthening the treatment capacity, so that the treatment effect of the constructed wetland system is improved.

Description

MABR constructed wetland device capable of being treated in enhanced mode

Technical Field

The invention belongs to the field of sewage treatment, and particularly relates to an MABR constructed wetland device capable of performing enhanced treatment.

Background

The artificial wetland is a sewage treatment technology formed by the evolution and development of natural wetland. The constructed wetland is designed and built according to the needs of people and the actual situation of the topography, and the purification effect on micro-polluted or light-polluted water bodies is completed by utilizing the synergistic effect of various principles of physics, chemistry and biology in a natural ecological system. The general wetland mainly comprises a water filtering medium, vegetation, a water distribution system and the like. Generally, the water is filtered, intercepted and adsorbed by a filter medium, and the biochemical actions of microorganisms, vegetation and the like are utilized to purify the indexes such as ammonia nitrogen, total phosphorus, COD and the like in the sewage. The technology often has the following problems in practical application: (1) the treatment effect is greatly influenced by temperature and seasonality, and if the temperature is lower in winter, the biological activity of wetland vegetation tends to stop, so that the treatment capacity of the system is greatly reduced; (2) under the influence of plant photosynthesis, under the influence of night and partial extreme weather, the oxygen supply capacity of the water body is insufficient, so that the pollutant removal capacity is reduced; (3) the wetland generally occupies a large area, the flow velocity of water flow is slow, the water filtering medium and vegetation need to be distributed in the whole area, the treatment energy per unit area is low, and the investment is large; (4) the system has weak impact load capacity, and if the upstream meets steal discharge or high-concentration sewage flows in and exceeds the operation load of the system, the system is broken down and is difficult to recover; (5) the drainage medium is blocked and cannot be provided with a cleaning system due to the overlarge area.

The invention patent with publication number CN 109516549A and application date of 2018, 12 and 7 discloses an ecological bracket combined purification system of a membrane aeration biomembrane reactor, which comprises an MABR system and a biological floating bed; the MABR system comprises an air compressor, a compressed air pressure regulating valve, a membrane module and a mounting bracket for mounting the membrane module, wherein the air compressor, the compressed air pressure regulating valve and the membrane module are sequentially communicated; the mounting bracket includes: the device comprises a vertical support, a telescopic horizontal control arm, an upper support and a lower support, wherein the vertical support and the telescopic horizontal control arm are fixedly connected with a bank; the upper bracket and the lower bracket are both connected with the horizontal control arm and driven to extend and retract in the direction vertical to the water flow; the top of the membrane component is fixedly connected with the upper bracket, the bottom of the membrane component is fixedly connected with the lower bracket, and the biological floating bed is positioned above and connected with the upper bracket. The device needs to be provided with a certain number of floaters to generate buoyancy, belongs to an open device, is influenced by water impurities, such as foreign matters flowing in a river channel and being scraped, internal membrane wires are easy to damage, and the membrane wires can lose the using effect due to dirt blockage and dirtiness after being used for a period of time.

In conclusion, many problems still exist in the current artificial wetland technology and need to be solved urgently.

Disclosure of Invention

1. Problems to be solved

In order to solve the problem of poor treatment effect of an artificial wetland system in the prior art, the invention provides an MABR artificial wetland device capable of performing enhanced treatment, which comprises a water treatment unit, an air supply pipeline and a buoyancy unit; the buoyancy unit provides buoyancy for the device, and the air supply pipeline provides gas for the water treatment unit and the buoyancy unit, so that the water circulation speed can be increased, and the sewage treatment effect of the artificial wetland system can be improved.

Furthermore, a penetration layer I with a certain thickness is arranged between the surface layer and the middle layer of the fiber membrane yarn, so that the use strength of the fiber membrane yarn is greatly improved. According to the invention, the MABR technical principle and the constructed wetland technical principle are coupled and improved to form the MABR constructed wetland device capable of strengthening the treatment capacity, so that the treatment effect of the constructed wetland system is improved, and the problem of poor treatment effect of the constructed wetland system in the prior art is solved.

2. Technical scheme

In order to solve the problems, the technical scheme adopted by the invention is as follows:

the invention discloses an MABR constructed wetland device capable of strengthening treatment, which comprises a water inlet, a water treatment unit, an air supply pipeline and a buoyancy unit, wherein the water inlet is arranged at the lower part of the water treatment unit; the water treatment unit comprises an artificial wetland module, an aeration pipe I and a membrane reactor, wherein the membrane reactor is arranged at the upper part of the aeration pipe I; the membrane reactor comprises an air inlet pipe and a fiber membrane wire, the aeration pipe I and the air inlet pipe are communicated with an air supply pipeline, an air inlet at one end of the fiber membrane wire is communicated with the air inlet pipe, and an air outlet is formed in the other end of the fiber membrane wire; the buoyancy unit comprises a gas collection tank; the gas collection tank is arranged at the lower part of the water treatment unit and is provided with a gas storage cavity, and the gas supply pipeline is communicated with the gas storage cavity.

Preferably, the artificial wetland module comprises a plant layer and a packing layer, wherein the plant layer is arranged at the upper part of the packing layer, and the water inlet is arranged at the bottom of the packing layer.

Preferably, the fiber membrane yarn comprises a supporting layer, a middle layer and a skin layer which are sequentially arranged from inside to outside; be provided with between epidermal layer and the intermediate level and permeate through layer I, the thickness of permeating through layer I is H₁Thickness of the skin layer of H₂，H₁:H₂＝0.05-0.5。

Preferably, the side part of the water treatment unit is provided with a water-resisting weir plate and an effluent weir plate; the membrane reactor is provided with an air outlet pipe, the air outlet pipe is communicated with an air outlet of the fiber membrane yarn, and an air outlet of the air outlet pipe is arranged between the water-resisting weir plate and the water outlet weir plate.

Preferably, the water outlet weir plate extends upwards from the bottom in a direction away from the water treatment unit.

Preferably, the cross-sectional area of the gas collecting box is gradually reduced from top to bottom.

Preferably, the gas collection tank is provided with a tank body, the water inlet is arranged at the bottom of the tank body, and the water inlet is provided with a filter screen; the filler layer is arranged in the groove body.

Preferably, a permeation layer II is arranged between the middle layer and the supporting layer of the fiber membrane yarn, and the thickness of the permeation layer II is H₃The thickness of the intermediate layer is H₄，H₃:H₄＝0.1-0.5。

Preferably, the thickness of the middle layer of the fiber membrane filaments is H₄，H₄20-100 μm, thickness of epidermal layer H₂，H₂＝0.5-10μm。

Preferably, the intermediate layer of fibrous membrane filaments has an average pore size P on the side facing away from the support layer₁The average pore diameter of the side of the intermediate layer in contact with the support layer is P₂，P₁＜P₂。

Preferably, the vertical height of the water-resisting weir plate is greater than that of the water outlet weir plate.

Preferably, the gas collection box is provided with an aeration pipe II, the aeration pipe II is arranged at the lower part of the tank body, and the width of the tank body is smaller than that of the aeration pipe II.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention discloses an MABR constructed wetland device capable of strengthening treatment, which comprises a water inlet, a water treatment unit, an air supply pipeline and a buoyancy unit; the buoyancy unit provides buoyancy for the device, and the air supply pipeline provides gas required in the operation process for the water treatment unit and the buoyancy unit, so that the water circulation speed can be increased, and the sewage treatment effect of the artificial wetland system can be improved; the invention improves the pollutant impact load resistance of the device by combining the MABR technology; meanwhile, the processing capacity of unit area is improved; the application scene of the invention is not limited to the wetland, and the gas stripping technology is matched, so that the application range of the device is greatly expanded, and the problems of limited application and weak processing capacity of the traditional artificial wetland system are solved.

(3) According to the MABR constructed wetland device capable of strengthening treatment, sewage enters the device through the screen at the bottom of the filter material of the filler layer, and is filtered by the filter material, so that large impurities in the sewage are intercepted to prevent the large impurities from entering a system to damage membrane filaments such as branches, leaves, plant roots and stalks, garbage and the like, and meanwhile, the filter material also has a certain adsorption effect on pollutants; a certain amount of microbes are attached to the surface of the filter material, and the microbes can perform biological and biochemical reactions to remove pollutants in water.

(3) According to the MABR constructed wetland device capable of being treated in an enhanced mode, the thickness of the surface layer determines the oxygen transmission permeation flux of the composite membrane; the intermediate layer has certain infiltration thickness for the supporting layer, has strengthened the mechanical strength of complex film, avoids the intermediate layer to drop, has improved the bonding strength between two-layer, avoids can appearing peeling off, the action of droing in the in-service use process, has strengthened complex film performance, increase of service life.

(4) According to the MABR constructed wetland device capable of performing enhanced treatment, the side part of the water treatment unit is provided with the water-stop weir plate and the water outlet weir plate, and tail gas at the gas outlet of the membrane reactor drives sewage in the device to flow out of the device; because gas stripping is generated, liquid in the water outlet weir and the partition plate continuously flows out of the device under the drive of gas, so that the liquid level of the part is always lower than the liquid level in the device, the liquid in the device also continuously flows into the region under the action of gas pressure, and the liquid level outside the device is always higher than the liquid in the device; further, under the action of air pressure, sewage outside the device can continuously flow into the device from the filling area; the design of gas stripping ensures that the device can still realize water circulation, sewage inlet and clear water outlet in the device even in the environment without water flow, thereby realizing purification.

(5) According to the MABR constructed wetland device capable of strengthening treatment, the gas collection tank is provided with the aeration pipe II, the aeration pipe II is arranged at the lower part of the tank body, the width of the tank body is smaller than that of the aeration pipe II, and a gas bubble cleaning system is formed by introducing gas into the aeration pipe II and the aeration pipe I, so that the problem of pollution and blockage of the traditional constructed wetland can be solved, oxygen can be provided for high-activity microorganisms loaded on the surface of an MABR membrane wire, the sewage pollutant removal capacity is greatly improved, and the problems of insufficient treatment capacity and the like caused by water quality deterioration or environmental factors are solved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a fiber membrane filament of the present invention;

FIG. 3 is a cross-sectional view of a fiber membrane filament of the present invention.

In the figure: 100. a gas supply line; 110. the direction of gas flow;

210. an aeration pipe I; 220. an air inlet pipe; 230. a gas outlet; 240. fiber membrane filaments; 241. a support layer; 242. an intermediate layer; 243. a skin layer; 244. a permeable zone II; 245. a cavity; 250. a plant layer; 260. a filler layer; 270. an air outlet pipe;

300. a gas collection tank; 310. a gas storage cavity; 320. an aeration pipe II; 330. a trough body;

400. a water-resisting weir plate; 500. a water outlet weir plate; 600. an external body of water.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The invention is described in detail below with reference to specific exemplary embodiments. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to be illustrative of the state of the art as developed and the meaning of the present technology and is not intended to limit the scope of the invention or the application and field of application of the invention.

Example 1

The MABR constructed wetland device capable of strengthening treatment comprises a water inlet, a water treatment unit, an air supply pipeline 100 and a buoyancy unit, wherein the water inlet is arranged at the lower part of the water treatment unit.

As shown in fig. 1, the water treatment unit comprises an artificial wetland module, an aeration pipe I210 and a membrane reactor, wherein the membrane reactor is arranged at the upper part of the aeration pipe I210. The artificial wetland module comprises a plant layer 250 and a filler layer 260, wherein the plant layer 250 is arranged on the upper part of the filler layer 260. The wetland plants in the plant layer 250 are planted in the filler layer 260, and the wetland plants can be calamus and can also be other aquatic plants with stronger pollutant absorption capacity. The filler used in the filler layer 260 may be volcanic rock filter material or other filter material, and the bottom of the filter material of the filler layer 260 is a large-pore screen. The membrane reactor comprises an air inlet pipe 220 and fiber membrane yarns 240, an aeration pipe I210 and the air inlet pipe 220 are communicated with an air supply pipeline 100, an air inlet at one end of each fiber membrane yarn 240 is communicated with the air inlet pipe 220, and an air outlet is formed in the other end of each fiber membrane yarn 240. As shown in fig. 3, a cavity 245 is disposed inside the fiber membrane filament 240, and the gas flows through the cavity 245 of the fiber membrane filament 240 from the gas inlet pipe 220 in the gas flowing direction 110 and then flows out from the gas outlet. The tail end of the membrane wire is discharged to realize a gas stripping technology, and a large hydraulic driving force can be provided for the device, so that the membrane wire tail end gas stripping device can be applied to a water body river channel with flow velocity, and can also be applied to a completely non-flowing dead water lake and foul water ditch, and the application range of the device is expanded.

Further, as shown in fig. 2, the fiber membrane yarn 240 includes a support layer 241, an intermediate layer 242, and a skin layer 243 sequentially arranged from inside to outside, wherein the intermediate layer 242 is arranged between the support layer 241 and the skin layer 243, and is used for solving the problem that the skin layer 243 is easy to peel off when directly covering the support layer 241. The supporting layer 241 is a macroporous supporting base film layer, plays a role of mechanical support and avoids the phenomenon of wire breakage in the using process. The intermediate layer 242 is a mesoporous film transition layer, plays a role in intermediate transition, and firmly bonds the support layer 241 and the skin layer 243, so that uniform defect-free preparation of the skin layer 243 is realized. The skin layer 243 is a dense functional layer that functions as an oxygen transport and biofilm carrier, the dense structure of which prevents wetting and fouling of the MABR membrane. A permeable layer I is arranged between the skin layer 243 and the intermediate layer 242, and the thickness of the permeable layer I is H₁The thickness of the skin layer 243 is H₂，H₁:H₂0.05-0.5. The thickness of the permeation layer defines the form of the connection between the two films and determines the strength of the bond between the two layers. If the permeable layer is not present, the two layers of films can be stripped and fall off in the actual use process, and the service performance and the service life of the composite film are influenced. The middle layer 242 of the fiber membrane yarn 240 is in an asymmetric structure, and the average pore diameter of the side of the middle layer 242 far away from the support layer 241 is P₁The intermediate layer 242 has an average pore diameter P on the side contacting the support layer 241₂，P₁＜P₂. A penetration layer II 244 is arranged between the middle layer 242 and the support layer 241 of the fiber membrane yarn 240, and the thickness of the penetration layer II 244 is H₃The thickness of the intermediate layer 242 is H₄，H₃:H₄0.1-0.5. Permeable layer II 244 is the portion of intermediate layer 242 that is embedded in support layer 241. The thickness of the permeable layer II 244 defines the form of the connection between the two films and determines the strength of the bond between the two layers. The thickness of the middle layer 242 of the fiber membrane yarn 240 is H₄，H₄20-100 μm, and the thickness of the skin layer 243 is H₂，H₂＝0.5-10 μm. The fiber membrane yarn 240 is made of one or more of polydimethylsiloxane, polytetrafluoroethylene, polysulfone, polypropylene, polyvinylidene fluoride, polyether sulfone resin and poly-4-methylpentene, and the fiber membrane yarn 240 has excellent physical properties, has both strength and toughness and extremely strong oxygen permeability, can be made of different materials according to actual conditions, and can meet the requirements of different manufacturing costs and performances.

As shown in fig. 1, the buoyancy unit includes a gas collection tank 300, the gas collection tank 300 may be a part of the device housing, which plays a role of protecting the internal membrane filaments of the device, and the semi-closed housing is also a key for realizing the internal and external hydraulic large circulation by the gas stripping technology, so that the device has a fixed inlet and outlet without short flow and water flow blockage. Moreover, semi-closed structure can guarantee that the sewage that gets into inside is free from the foreign matter influence, and fibrous membrane silk 240 life can reach the longest. The gas collection tank 300 is arranged at the lower part of the water treatment unit, the lower part of the gas collection tank 300 is open, the top and the side part form a gas storage cavity 310, the gas supply pipeline 100 is communicated with the gas storage cavity 310, and the cross-sectional area of the gas collection tank 300 is gradually reduced from top to bottom. The gas collection tank 300 is provided with a tank body 330, a water inlet is arranged at the bottom of the tank body 330, a filter screen or a filter plate is arranged at the water inlet, and a filler layer 260 is arranged in the tank body 330. The filter screen or filter can avoid the filter material to fall into outside the equipment, and can carry out the primary filtration to intaking. The gas collecting tank 300 is provided with an aeration pipe II 320, the aeration pipe II 320 is arranged at the lower part of the tank body 330, and the width of the tank body 330 is smaller than that of the aeration pipe II 320. The aeration pipe II 320 is generally a common pvc perforated pipe, which not only can provide cleaning function for the packing layer 260 and the membrane reactor, but also can provide air required for generating buoyancy for the gas collection box 300.

As shown in fig. 1, the side of the water treatment unit is provided with a water-stop weir plate 400 and an effluent weir plate 500, and the water-stop weir plate 400 is used to separate an external water body 600 from the inside of the apparatus. The membrane reactor is provided with an outlet pipe 270, the outlet pipe 270 is communicated with the outlet of the fiber membrane filaments 240, and the gas outlet 230 of the outlet pipe 270 is arranged in the drainage groove 510 between the water-resisting weir plate 400 and the water outlet weir plate 500. Drainage groove 510 can make rivers pass through, and membrane silk tail gas need pass through drainage groove 510 simultaneously, and drainage groove 510 is the key structure that realizes the gas stripping inside and outside major cycle. Go out water weir plate 500 and upwards extend to the direction of keeping away from the water treatment unit by the bottom, and the vertical height of water-stop weir plate 400 is greater than the vertical height of a water weir plate 500, can be so that form the liquid level difference with the device is inside between water-stop weir plate 400 and the play water weir plate 500 for inside water outwards flows out, and then promotes the rivers circulation.

When the device is in operation, sewage enters the device through the screen at the bottom of the filter material of the filler layer 260, large impurities in the sewage are intercepted by the filter material so as to prevent the large impurities from entering a system to damage membrane filaments, such as branches, leaves, plant roots and stems, garbage and the like, and meanwhile, the filter material also has a certain adsorption effect on pollutants; a certain amount of microbes are attached to the surface of the filter material, and the microbes can perform biological and biochemical reactions to remove pollutants in water. Then the sewage flows upwards through the plant layer 250, the plant layer 250 is composed of common wetland plants and algae, and mainly adsorbs pollutants in the water, and oxygen is supplemented to the sewage by utilizing the photosynthesis of the plants to prevent the black and odorous phenomenon of the water body; meanwhile, sewage flows through the membrane reactor, and because the gas supply pipeline 100 continuously supplies gas to the fiber membrane filaments 240, high-activity microorganisms are also loaded on the surfaces of the membrane filaments, and the nitrification reaction and the aerobic reaction are carried out by using oxygen transferred by the mass inside the fiber membrane filaments 240; in addition, by controlling the amount of air supplied to the fiber membrane wires 240 and the amount of biofilm formation by microorganisms, an anoxic denitrification reaction or the like may occur around the fiber membrane wires 240. The tail gas of the fiber membrane yarn 240 is introduced between the water-proof weir plate 400 and the water outlet weir plate 500 through the gas outlet, and the tail gas drives the sewage in the device to flow out of the device. Due to the design of gas stripping, the liquid in the water-resisting weir plate 400 and the water outlet weir plate 500 can continuously flow out of the device under the drive of gas, so that the liquid level of the part is always lower than the liquid level in the device, and meanwhile, the liquid in the device also continuously flows into the region under the action of gas pressure. Because the liquid in the device flows out of the device continuously under the action of air stripping, the liquid level outside the device is always higher than the liquid level in the device, and sewage outside the device flows into the device from the packing layer 260 under the action of air pressure. The design of gas stripping ensures that the device can still realize water circulation, sewage inlet and clear water outlet in the device even in the environment without water flow, thereby realizing purification.

In this example, the present invention was applied to a wetland having a water depth of about 1 m. The filler of the filler layer 260 is volcanic rock with the grain diameter of 10mm-50 mm; the aeration pipe II 320 is a common pvc perforated pipe; the wetland plants in the plant layer 250 are common wetland aquatic plants calamus; because the water depth is about 1 meter, the device can directly stand at the water bottom without calculating the relationship between the buoyancy of the corridor and the weight of the device. Wherein the vertical height of the effluent weir plate 500 is 0.5m, the vertical height of the water-resisting weir plate 400 is 0.6m, the effective height of the device bottom support or gas collection tank 300 is 0.5m, and the width L of the gas collection tank 300 is 0.5m₁The length of the fiber membrane yarn 240 is 1m, the filling length of the fiber membrane yarn 240 is 2m, the arrangement width of an aeration pipe II 320 at the bottom of the device is 1.2m, and the total effective width of the device is 4.5 m.

The device is filled by volcanic rocks, so that the total weight of the device is enough to be placed at the bottom of a 1-meter deep wetland and does not move along with water flow. The fibrous membrane filaments 240 have a packing area of about 300 square meters. The maximum air supply fan of the fiber membrane yarn 240 is 0.01Nm³/m²h, type selection is carried out, and frequency conversion and flowmeter control are needed.

In the embodiment, the device is placed in a natural water body with the depth of 1m, a sewage treatment plant is arranged at the upstream of the water body, the water quality can reach the water quality of surface IV water after the artificial wetland treatment, the total nitrogen is less than 10mg/L, and the water quality of inlet water is shown in Table 1.

Table 1: quality of inlet water

In the case of the influent quality of Table 1, the water quality after treatment in the area was reduced to that shown in Table 2 by treatment according to the present invention.

Table 2: treated water quality

Comparative example 1

The basic content of the comparative example is the same as that of the example 1, but when the sewage is discharged in a random way in a drainage basin or the concentration of pollutants exceeds the standard, the water quality is shown in the following table 3:

TABLE 3

When the artificial wetland consisting of the traditional filter material and plants is used for treatment. When the pollutants are discharged randomly or impact load with high concentration appears as shown in Table 3, the water quality in the area is obviously deteriorated, and the detected water quality deterioration condition is shown in Table 4:

TABLE 4

If the invention is used, the regional water quality is treated under the same condition, so that the water quality in the region is consistent with the water quality in the region where the high-load pollutants appear, and the regional water quality is not influenced by the phenomenon of stealing, discharging and disordering in the flow region. The water quality in the examined area is shown in table 5:

TABLE 5

It is thus understood that the present invention provides a good treatment effect when treating a high-concentration pollutant impact load occurring in an area, and prevents deterioration of water quality due to the high-pollutant impact load from occurring in the area.

Example 2

The basic content of this example is the same as example 1, except that the present invention is applied to a small lake which has no outflow but has a pollution source continuously flowing in, and the lake is considered to be a non-flowing dead water environment and the lake depth exceeds 4 m.

In this embodiment, the filler of the filler layer 260 is volcanic rock with a particle size of 10mm-50 mm; the aeration pipe II 320 is a common pvc perforated pipe; the wetland plants in the plant layer 250 are common wetland aquatic plants calamus; because the water depth exceeds 4 meters, the device needs to float on the water surface, and the buoyancy and the installation of the corridor are calculatedThe weight relationship is arranged so that the total mass m of the device is less than rho_{Water (W)}*V_{Corridor volume}. Wherein the vertical height of the effluent weir plate 500 is 0.5m, the vertical height of the water-resisting weir plate 400 is 0.6m, the effective height of the device bottom support or gas collection tank 300 is 0.5m, and the width L of the gas collection tank 300 is 0.5m₁The length of the fiber membrane yarn 240 is 0.2m, the filling length of the fiber membrane yarn 240 is 0.5m, the arrangement width of the aeration pipe II 320 at the bottom of the device is 0.4m, and the total effective width of the device is 1.3 m.

Through volcanic rock filling, the device can float on the water surface under the condition that the total mass of the device is not higher than 3600 kg. The fibrous membrane filaments 240 have a packed area of about 200 square meters. The maximum air supply fan of the fiber membrane yarn 240 is 0.01Nm³/m²h, type selection is carried out, and frequency conversion and flowmeter control are needed. The water quality of the polluted lake is shown in the following table 6:

TABLE 6

The invention is placed in the small non-flowing lake to treat water quality, and under the condition that the external sewage is discharged uninterruptedly, the water quality can be purified to the state shown in the table 7:

TABLE 7

Comparative example 2

The basic content of this example is the same as example 1, and the sewage scene is the same as that in example 2. The invention is applied to a small lake with sewage source inflow and no outflow, and the lake is considered as a non-flowing dead water environment with the water depth of more than 4 meters. The water quality is shown in table 6 in example 2.

A common filter material plant artificial wetland device which is reinforced by an MABR-free membrane and has no gas lift enhancement circulation is arranged in the environment. After a sufficient period of time to purify the water, the water quality is shown in table 8:

TABLE 8

Comparing the water quality data in table 7 in example 2, it can be seen that the conventional artificial wetland device has a poor treatment effect on such water bodies without obvious water flow, and ammonia nitrogen and total nitrogen are not obviously removed basically. The water conservancy flows and has seriously influenced the device treatment effect. However, the device of the invention adopts a gas stripping design, the internal and external circulation flow rate of the device is greatly improved, and the treatment effect is enhanced by matching with an MABR membrane technology.

More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, combined, e.g., between various embodiments, adapted and/or substituted, as would be recognized by those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.

Claims

1. The utility model provides a but MABR constructed wetland device of intensive treatment which characterized in that: the device comprises a water inlet, a water treatment unit, an air supply pipeline (100) and a buoyancy unit, wherein the water inlet is arranged at the lower part of the water treatment unit;

the water treatment unit comprises an artificial wetland module, an aeration pipe I (210) and a membrane reactor, wherein the membrane reactor is arranged at the upper part of the aeration pipe I (210); the membrane reactor comprises an air inlet pipe (220) and fiber membrane yarns (240), the aeration pipe I (210) and the air inlet pipe (220) are communicated with an air supply pipeline (100), an air inlet at one end of each fiber membrane yarn (240) is communicated with the air inlet pipe (220), and an air outlet is formed in the other end of each fiber membrane yarn (240);

the buoyancy unit comprises a gas collection tank (300); the gas collection tank (300) is arranged at the lower part of the water treatment unit, the gas collection tank (300) is provided with a gas storage cavity (310), and the gas supply pipeline (100) is communicated with the gas storage cavity (310).

2. The MABR constructed wetland device capable of being intensively treated according to claim 1, which is characterized in that: the artificial wetland module comprises a plant layer (250) and a packing layer (260), wherein the plant layer (250) is arranged on the upper part of the packing layer (260), and the water inlet is arranged at the bottom of the packing layer (260).

3. The MABR constructed wetland device capable of being intensively treated according to claim 1, which is characterized in that: the fiber membrane yarn (240) comprises a supporting layer (241), an intermediate layer (242) and a skin layer (243) which are sequentially arranged from inside to outside; a permeable layer I is arranged between the epidermal layer (243) and the intermediate layer (242), and the thickness of the permeable layer I is H₁The thickness of the skin layer (243) is H₂，H₁:H₂＝0.05-0.5。

4. The MABR constructed wetland device capable of being intensively treated according to claim 1, which is characterized in that: a water-resisting weir plate (400) and a water outlet weir plate (500) are arranged on the side part of the water treatment unit; the membrane reactor is provided with an air outlet pipe (270), the air outlet pipe (270) is communicated with an air outlet of the fiber membrane filaments (240), and an air outlet (230) of the air outlet pipe (270) is arranged between the water-resisting weir plate (400) and the water outlet weir plate (500), and/or

The water outlet weir plate (500) extends upwards from the bottom to the direction far away from the water treatment unit.

5. The MABR constructed wetland device capable of being intensively treated according to claim 1, which is characterized in that: the cross-sectional area of the gas collection box (300) is gradually decreased from top to bottom.

6. The MABR constructed wetland device capable of being intensively treated according to claim 2, wherein: the gas collection tank (300) is provided with a tank body (330), a water inlet is arranged at the bottom of the tank body (330), and the water inlet is provided with a filter screen; the filler layer (260) is disposed in the slot (330).

7. The MABR constructed wetland device capable of being intensively treated according to claim 3, wherein: a penetration layer II (244) is arranged between the middle layer (242) of the fiber membrane yarn (240) and the supporting layer (241), and the thickness of the penetration layer II (244) is H₃The thickness of the intermediate layer (242) is H₄，H₃:H₄0.1-0.5, and/or

The thickness of the middle layer (242) of the fiber membrane yarn (240) is H₄，H₄20-100 μm, the thickness of the skin layer (243) being H₂，H₂＝0.5-10μm。

8. The MABR constructed wetland device capable of being intensively treated according to claim 3, wherein: the average pore diameter of the side of the middle layer (242) of the fiber membrane yarn (240) far away from the support layer (241) is P₁The intermediate layer (242) has an average pore diameter P on the side in contact with the support layer (241)₂，P₁＜P₂。

9. The MABR constructed wetland device capable of being intensively treated according to claim 4, wherein: the vertical height of the water-resisting weir plate (400) is greater than that of the water outlet weir plate (500).

10. The MABR constructed wetland device capable of being intensively treated according to claim 6, wherein: the gas collection tank (300) is provided with an aeration pipe II (320), the aeration pipe II (320) is arranged at the lower part of the tank body (330), and the width of the tank body (330) is smaller than that of the aeration pipe II (320).