CN111762980B - MABR constructed wetland device capable of strengthening treatment - Google Patents
MABR constructed wetland device capable of strengthening treatment Download PDFInfo
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Abstract
The invention belongs to the field of sewage treatment, and relates to an MABR constructed wetland device capable of strengthening treatment. The invention comprises a water treatment unit, a gas supply pipeline and a buoyancy unit; the buoyancy unit provides buoyancy for the device, and the air supply pipeline provides air for the water treatment unit and the buoyancy unit; the permeable 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, through coupling improvement of the MABR technical principle and the constructed wetland technical principle, the MABR constructed wetland device capable of strengthening the treatment capacity is formed, the treatment effect of the constructed wetland system is improved, the application scene of the invention is not only limited to the wetland, but also greatly expands the application range of the device by matching with the gas stripping technology, and the problems of application limitation and weak treatment capacity of the traditional constructed wetland system are solved.
Description
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to an MABR constructed wetland device capable of strengthening treatment.
Background
Constructed 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 a plurality of 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. The biochemical actions of filtering, interception, adsorption capacity, microorganisms, vegetation and the like of the water filtering medium are generally relied on to purify indexes such as ammonia nitrogen, total phosphorus, COD and the like in sewage. This technology often has the following problems in practical applications: (1) The treatment effect is greatly influenced by temperature and seasonality, for example, when 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 photosynthesis of plants, at night and under the influence of 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 speed of water flow is low, the whole area needs to be covered by the water filtering medium and vegetation, the treatment energy per unit area is low, and the investment is large; (4) The system has weak impact load carrying capacity, and if the upstream sewage is discharged or high-concentration sewage flows in, the system exceeds the running load of the system, and the system is crashed and is difficult to recover; (5) The filter medium is blocked, and a cleaning system cannot be equipped due to the overlarge area of the area.
The invention patent with publication number CN 109516549A and application day 2018, 12 and 7 discloses a membrane aeration biological membrane reactor ecological support combined purification system, 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 assembly and a mounting bracket for mounting the membrane assembly, which are sequentially communicated; the mounting bracket includes: the vertical support and the telescopic horizontal control arm are fixedly connected with the bank, the upper support is hinged with the upper part of the vertical support, and the lower support is hinged with the lower part of the vertical support; the upper bracket and the lower bracket are connected with the horizontal control arm and driven to stretch and retract in the direction perpendicular 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 the upper bracket and connected with the upper bracket. The device needs to install a certain amount of floats and produces buoyancy, and the device belongs to openness device, receives quality of water impurity influence, and foreign matter flows in like the river course and cuts and scratch etc. inside membrane silk extremely fragile, and the membrane silk can be because dirty stifled dirty losing result of use after using a period.
In view of the above, many problems still remain to be solved in the present constructed wetland technology.
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 strengthening 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 constructed wetland system is improved.
Furthermore, the permeable layer I with a certain thickness is arranged between the surface layer and the middle layer of the fiber membrane yarn used by the invention, so that the use strength of the fiber membrane yarn is greatly improved. According to the invention, through coupling improvement of the MABR technical principle and the constructed wetland technical principle, the MABR constructed wetland device capable of strengthening the treatment capacity is formed, 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 proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
The invention relates to an MABR constructed wetland device capable of strengthening treatment, which comprises a water inlet, a water treatment unit, a gas 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, and 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, wherein the air inlet 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 arranged at the other end of the fiber membrane wire; the buoyancy unit comprises a gas collection box; the gas collection box 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 constructed wetland module comprises a plant layer and a filler layer, wherein the plant layer is arranged on the upper part of the filler layer, and the water inlet is arranged on the bottom of the filler layer.
Preferably, the fiber membrane yarn comprises a supporting layer, an intermediate layer and a surface layer which are sequentially arranged from inside to outside; and a permeable layer I is arranged between the surface layer and the middle layer, the thickness of the permeable layer I is H 1, and the thickness of the surface layer is H 2,H1:H2 =0.05-0.5.
Preferably, the side of the water treatment unit is provided with a water-blocking weir plate and a water-discharging weir plate; the membrane reactor is provided with an air outlet pipe which is communicated with the air outlet of the fiber membrane filaments, and the air outlet of the air outlet pipe is arranged between the water-proof weir plate and the water-out weir plate.
Preferably, the water outlet weir plate extends upwardly from the bottom in a direction away from the water treatment unit.
Preferably, the cross-sectional area of the gas collection box gradually decreases from top to bottom.
Preferably, the gas collecting 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 packing layer is arranged in the groove body.
Preferably, a permeable layer II is arranged between the middle layer and the supporting layer of the fiber membrane filaments, the thickness of the permeable layer II is H 3, and the thickness of the middle layer is H 4,H3:H4 =0.1-0.5.
Preferably, the thickness of the intermediate layer of fibrous membrane filaments is H 4,H4 = 20-100 μm and the thickness of the skin layer is H 2,H2 = 0.5-10 μm.
Preferably, the mean pore diameter of the side of the intermediate layer of fibrous membrane filaments remote from the support layer is P 1 and the mean pore diameter of the side of the intermediate layer in contact with the support layer is P 2,P1＜P2.
Preferably, the vertical height of the water-barrier is greater than the vertical height of the water-outlet barrier.
Preferably, the gas collecting tank 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 MABR constructed wetland device capable of strengthening treatment comprises a water inlet, a water treatment unit, an air supply pipeline and a buoyancy unit; the buoyancy unit provides buoyancy for the device, the air supply pipeline provides gas required in the running 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 constructed wetland system can be improved; the invention combines MABR technology to improve the pollutant impact load resistance of the device; meanwhile, the processing capacity of unit area is improved; the application scene of the invention is not limited to the wetland, and the application range of the device is greatly expanded by matching with the gas stripping technology, so that the problems of application limitation and weak processing capacity of the traditional constructed wetland system are solved.
(3) According to the MABR constructed wetland device capable of strengthening treatment, sewage enters the device through the screen mesh at the bottom of the filter material of the filler layer, large impurities in the sewage are firstly intercepted through filtering of the filter material so as not to enter a system to damage membrane wires, such as branches, leaves, plant rhizomes, garbage and the like, and meanwhile, the filter material also plays a certain role in adsorbing pollutants; a certain amount of microorganisms can be attached to the surface of the filter material, and the microorganisms can carry out biological and biochemical reactions to remove pollutants in water.
(3) According to the MABR constructed wetland device capable of strengthening treatment, 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, has avoided the intermediate layer to drop, has improved the bonding strength between two-layer, avoids peeling off, the action that drops can appear in the in-service use, has strengthened complex film performance, increase of service life.
(4) According to the MABR constructed wetland device capable of strengthening treatment, the side part of the water treatment unit is provided with the water-proof weir plate and the water-out weir plate, and tail gas at the gas outlet of the membrane reactor drives sewage in the device to flow out of the device; the gas stripping is generated, so that the liquid in the water outlet weir and the baffle plate continuously flows out of the device under the drive of the gas, the liquid level in the part is always lower than the liquid level in the device, and the liquid in the device continuously flows into the area under the action of the air pressure, so that the liquid level outside the device is always higher than the liquid level in the device; further, under the action of air pressure, sewage outside the device continuously flows into the device from the filling area; the design of gas stripping ensures that the device can still realize water flow circulation in the device even in the environment without water flow, sewage enters, and clear water exits, thereby realizing purification.
(5) According to the MABR constructed wetland device capable of strengthening treatment, the gas collecting 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 the aeration pipe II and the aeration pipe I are filled with gas to form a gas bubble cleaning system, so that the problem of pollution blocking of the traditional constructed wetland can be solved, oxygen can be provided for high-activity microorganisms loaded on the surface of MABR membrane wires, the pollutant removal capacity of sewage is greatly improved, and the problems of insufficient treatment capacity and the like caused by water quality deterioration or environmental factors are avoided.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic structural view of a fiber membrane filament according to the present invention;
Fig. 3 is a cross-sectional view of a fiber membrane filament of the present invention.
In the figure: 100. an air supply line; 110. a gas flow direction;
210. An aerator pipe I; 220. an air inlet pipe; 230. a gas outlet; 240. a fibrous membrane filament; 241. a support layer; 242. an intermediate layer; 243. a skin layer; 244. a permeation layer II; 245. a cavity; 250. a plant layer; 260. a filler layer; 270. an air outlet pipe;
300. A gas collection box; 310. a gas storage chamber; 320. an aeration pipe II; 330. a tank body;
400. a water-barrier weir plate; 500. a water outlet weir plate; 600. an external body of water.
Detailed Description
The application is further described below with reference to the accompanying drawings. The application is described in detail below in connection with specific exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the application as defined by the following claims. The detailed description and drawings are to be regarded in an illustrative rather than a restrictive sense, and if any such modifications and variations are desired to be included within the scope of the application described herein. Furthermore, the background art is intended to illustrate the state of the art and the meaning of the development and is not intended to limit the application or the field of application of the application.
Example 1
The MABR constructed wetland device capable of strengthening treatment comprises a water inlet, a water treatment unit, a gas 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 constructed 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 or other aquatic plants with strong pollutant absorption capacity. The filler used in the filler layer 260 can be volcanic filter material or other filter materials, and the bottom of the filter material of the filler layer 260 is a macroporous screen. The membrane reactor comprises an air inlet pipe 220 and a fiber membrane wire 240, wherein the air inlet pipe 220 is communicated with the air supply pipeline 100, an air inlet at one end of the fiber membrane wire 240 is communicated with the air inlet pipe 220, and an air outlet is arranged at the other end of the fiber membrane wire 240. As shown in fig. 3, the fiber membrane wires 240 are provided with a cavity 245 therein, and the gas flows in the direction 110 from the gas inlet pipe 220 through the cavity 245 of the fiber membrane wires 240 and then flows out from the gas outlet. The air outlet at the tail end of the membrane wire realizes the air stripping technology, can provide larger hydraulic driving force for the device, so that the device can be applied to a water body river channel with flow velocity, can be applied to dead water without flowing, lakes, stink ditches and the like, and expands the application range of the device.
Further, as shown in fig. 2, the fiber membrane filament 240 includes a supporting layer 241, an intermediate layer 242 and a skin layer 243 sequentially disposed from inside to outside, wherein the intermediate layer 242 is disposed between the supporting layer 241 and the skin layer 243, and is used for solving the problem that the skin layer 243 is easy to peel when directly covering the supporting layer 241. The supporting layer 241 is a macroporous supporting base film layer, plays a role in mechanical supporting, and avoids the phenomenon of broken wires in the using process. The middle layer 242 is a mesoporous film transition layer, plays a role in middle transition, firmly combines the supporting layer 241 and the epidermis layer 243, and realizes uniform and defect-free preparation of the epidermis layer 243. The skin layer 243 is a dense functional layer that acts as an oxygen transport and biofilm carrier, its dense structure prevents wetting and contamination of the MABR membrane. A permeable layer i is provided between the skin 243 and the intermediate layer 242, the thickness of the permeable layer i is H 1, and the thickness of the skin 243 is H 2,H1:H2 =0.05-0.5. The thickness of the permeation layer defines the form of the connection between the two films and determines the bond strength between the two layers. If no permeable layer exists, the two 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 affected. The middle layer 242 of the fiber membrane wire 240 has an asymmetric structure, the average pore diameter of the side of the middle layer 242 away from the support layer 241 is P 1, and the average pore diameter of the side of the middle layer 242 contacting the support layer 241 is P 2,P1＜P2. A permeable layer ii 244 is arranged between the middle layer 242 and the supporting layer 241 of the fiber membrane wire 240, the thickness of the permeable layer ii 244 is H 3, and the thickness of the middle layer 242 is H 4,H3:H4 =0.1-0.5. the permeation layer II 244 is a portion of the intermediate layer 242 embedded in the support layer 241. The thickness of the permeation layer ii 244 defines the form of the connection between the two films, determining the bond strength between the two layers. The thickness of the intermediate layer 242 of the fiber membrane filaments 240 is H 4,H4 =20-100 μm, and the thickness of the skin layer 243 is H 2,H2 =0.5-10 μm. The fiber membrane wires 240 are made of one or more of polydimethylsiloxane, polytetrafluoroethylene, polysulfone, polypropylene, polyvinylidene fluoride, polyethersulfone resin and poly 4-methylpentene, and the fiber membrane wires 240 have excellent physical properties, 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 comprises a gas collecting tank 300, the gas collecting tank 300 can be a part of a device shell, so that the function of protecting membrane wires inside the device is achieved, and meanwhile, the semi-closed shell is also a key for realizing large circulation of internal and external water power by a gas stripping technology, so that the device has a fixed inlet and outlet, and no short flow, water flow blockage and the like. Furthermore, the semi-closed structure can ensure that sewage entering the interior is free from foreign matters, and the service life of the fiber membrane filaments 240 can be maximized. The gas collecting tank 300 is arranged at the lower part of the water treatment unit, the lower part of the gas collecting tank 300 is opened, the top and the side parts form a gas storage cavity 310, the gas supply pipeline 100 is communicated with the gas storage cavity 310, and the cross section area of the gas collecting tank 300 is gradually decreased from top to bottom. The gas collecting 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 packing layer 260 is arranged in the tank body 330. The filter screen or the filter plate can prevent filter materials from falling out of the device, and can carry out primary filtration on inlet water. 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. Aeration pipe II 320 is typically a conventional pvc perforated pipe, and not only provides cleaning functions for packing layer 260 and the membrane reactor, but also provides air necessary for generating buoyancy for gas collection tank 300.
As shown in fig. 1, the sides of the water treatment unit are provided with a water blocking weir plate 400 and a water outlet weir plate 500, the water blocking weir plate 400 serving to isolate the external body of water 600 from the interior 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-blocking weir plate 400 and the water-outlet weir plate 500. The drainage groove 510 can enable water flow to pass through, meanwhile, membrane wire tail gas needs to pass through the drainage groove 510, and the drainage groove 510 is a key structure for realizing large circulation of gas stripping inside and outside. The water outlet weir plate 500 extends upwards from the bottom to a direction far away from the water treatment unit, and the vertical height of the water blocking weir plate 400 is larger than that of the water outlet weir plate 500, so that a liquid level difference is formed between the water blocking weir plate 400 and the water outlet weir plate 500 and the inside of the device, internal water flows outwards, and water flow circulation is promoted.
When the filter is operated, sewage enters the device through the screen mesh at the bottom of the filter material of the filler layer 260, large impurities in the sewage are firstly intercepted through the filtering of the filter material so as not to damage membrane wires such as branches, leaves, plant rhizomes, garbage and the like by entering the system, and meanwhile, the filter material also plays a certain role in adsorbing pollutants; a certain amount of microorganisms can be attached to the surface of the filter material, and the microorganisms can carry out biological and biochemical reactions to remove pollutants in water. Then sewage upwards flows through the plant layer 250, the plant layer 250 is composed of common wetland plants and algae, the adsorption is mainly carried out aiming at pollutants in water, and meanwhile, oxygen is supplemented into the sewage by utilizing photosynthesis of plants, so that the phenomenon of black and odorous water is prevented; meanwhile, sewage flows through the membrane reactor, and as the air supply pipeline 100 supplies air to the fiber membrane filaments 240 continuously, the surfaces of the membrane filaments also bear high-activity microorganisms, and the nitrifying reaction and the aerobic reaction are carried out by utilizing oxygen transferred from the inside of the fiber membrane filaments 240; furthermore, by controlling the air supply amount of the fiber membrane filaments 240 and the microbial film formation amount, anoxic denitrification reaction and the like can occur around the fiber membrane filaments 240. The tail gas of the fiber membrane wires 240 is introduced between the uniquely designed water-blocking weir plate 400 and the water-discharging 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 gas stripping design, the liquid in the water-proof weir plate 400 and the water-outlet weir plate 500 can continuously flow out of the device under the driving of gas, so that the liquid level in the part is always lower than the liquid level in the device, and meanwhile, the liquid in the device continuously flows into the region under the action of air pressure. Because the liquid in the device continuously flows out of the device under the air stripping action, 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 air pressure action. The design of gas stripping ensures that the device can still realize water flow circulation in the device even in the environment without water flow, sewage enters, and clear water exits, thereby realizing purification.
In this example, the present invention is applied to a wetland having a water depth of about 1 meter. The filler of the filler layer 260 is volcanic rock, and the particle size is 10mm-50mm; the aeration pipe II 320 is a common pvc perforated pipe; the wetland plants in the plant layer 250 are common wetland aquatic plants, namely calamus; because the water depth is about 1 meter, the device can be directly erected at the water bottom without calculating the relation between the buoyancy of the corridor and the weight of the device. Wherein, the vertical height of the water outlet weir plate 500 is 0.5m, the vertical height of the water isolation weir plate 400 is 0.6m, the effective height of the device bottom support or gas collection box 300 is 0.5m, the width L 1 of the gas collection box 300 is 1m, the filling length of the fiber membrane filaments 240 is 2m, the arrangement width of the device bottom aeration pipe II 320 is 1.2m, and the total effective width of the device is 4.5m.
Through volcanic rock filling, the total weight of the device is enough to be placed at the bottom of a 1-meter deep wetland, and the device does not move along with water flow. The fiber membrane filaments 240 have a loading area of about 300 square meters. The air supply fan of the fiber membrane wires 240 is selected according to the maximum of 0.01Nm 3/m2 h, and frequency conversion and flow meter control are needed.
In the embodiment, the device is placed in a natural water body with the water depth of 1 meter, a sewage treatment plant is arranged at the upstream of the water body, the water quality can reach the surface class IV water quality through the artificial wetland treatment, the total nitrogen is less than 10mg/L, and the water quality of inflow water is shown in the table 1.
Table 1: water quality of inlet water
In the case of the water quality of the water in Table 1, the water quality after the in-zone treatment was reduced as shown in Table 2 by the treatment of the present invention.
Table 2: quality of treated water
Comparative example 1
The basic contents of this comparative example are the same as in example 1, but when sewage is discharged in a watershed or the concentration of contaminants exceeds the standard, the water quality is as shown in Table 3:
TABLE 3 Table 3
When the artificial wetland formed by the traditional filter materials and plants is used for treatment. When the pollutant is stolen and discharged or high-concentration impact load is generated as shown in the table 3, the water quality in the area is obviously deteriorated, and the detected water quality deterioration condition is shown in the table 4:
TABLE 4 Table 4
If the invention is used, the water quality of the area is treated under the same condition, so that the water quality of the area is consistent with the water quality of the area before the high-load pollutant appears, and the water quality of the area is not influenced by the phenomenon of steal and discharge in the river basin. The water quality of the detected areas is shown in table 5:
TABLE 5
Therefore, the invention has better treatment effect when being used for treating the impact load of high-concentration pollutants in the area, and the water quality degradation caused by the impact load of high-concentration pollutants in the area can not be generated.
Example 2
The basic content of this example is the same as example 1, except that the invention is applied to a small lake without outflow but with continuous inflow of pollution sources, the lake is considered to be a no-flow dead water environment, and the lake water depth exceeds 4 meters.
In this embodiment, the filler of the filler layer 260 is volcanic rock, and the particle size is 10mm-50mm; the aeration pipe II 320 is a common pvc perforated pipe; the wetland plants in the plant layer 250 are common wetland aquatic plants, namely calamus; because the water depth exceeds 4 meters, the device needs to float on the water surface, and the relation between the buoyancy of the gallery and the weight of the device is calculated, so that the total mass m of the device is smaller than rho Water and its preparation method *V gallery volume . Wherein, the vertical height of the water outlet weir plate 500 is 0.5m, the vertical height of the water isolation weir plate 400 is 0.6m, the effective height of the device bottom support or gas collection box 300 is 0.5m, the width L 1 of the gas collection box 300 is 0.2m, the filling length of the fiber membrane filaments 240 is 0.5m, the arrangement width of the device bottom aerator pipe II 320 is 0.4m, and the total effective width of the device is 1.3m.
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 fiber membrane filaments 240 have a loading area of about 200 square meters. The air supply fan of the fiber membrane wires 240 is selected according to the maximum of 0.01Nm 3/m2 h, and frequency conversion and flow meter 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 no-flow small lake to treat the water quality, and the water quality can be purified to be shown in the table 7 finally under the condition that the external sewage is not discharged intermittently:
TABLE 7
Comparative example 2
The basic content of this embodiment is the same as that of embodiment 1, and the sewage scene is the same as that of embodiment 2. The invention is applied to a small lake with sewage source and no outflow, and the lake is considered to be a no-flow dead water environment, and the water depth is more than 4 meters. The water quality is shown in Table 6 in example 2.
The plant constructed wetland device is a common filter material plant constructed wetland device which is reinforced by using no MABR film and is free from gas stripping and reinforced circulation, and is placed in the environment. After the water quality was purified for a long enough time, the water quality was as shown in Table 8:
TABLE 8
The water quality data in table 7 in comparative example 2 shows that the conventional constructed wetland device has 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 flow seriously influences the device treatment effect. However, the device adopts the gas stripping design, so that the internal and external circulation flow rate of the device is greatly improved, and the treatment effect is enhanced by matching with the MABR membrane technology.
More specifically, although exemplary embodiments of the present invention have been described herein, the present invention is not limited to these embodiments, but includes any and all embodiments that have been modified, omitted, e.g., combined, adapted, and/or substituted between the various embodiments, as would be recognized by those skilled in the art in light of the foregoing detailed description. The limitations in the claims are to be interpreted broadly based on 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 (6)
1. An MABR constructed wetland device capable of strengthening treatment, which is characterized in that: 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 a fiber membrane wire (240), wherein the air inlet pipe (210) and the air inlet pipe (220) are communicated with an air supply pipeline (100), an air inlet at one end of the fiber membrane wire (240) is communicated with the air inlet pipe (220), and an air outlet is formed at the other end of the fiber membrane wire (240); 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), and the water inlet is arranged at the bottom of the filler layer (260); the fiber membrane yarn (240) comprises a supporting layer (241), an intermediate layer (242) and a surface layer (243) which are sequentially arranged from inside to outside; a permeable layer I is arranged between the surface layer (243) and the intermediate layer (242), the thickness of the permeable layer I is H 1, and the thickness of the surface layer (243) is H 2,H1:H2 =0.05-0.5;
The buoyancy unit comprises a gas collection tank (300); the gas collection box (300) is arranged at the lower part of the water treatment unit, the gas collection box (300) is provided with a gas storage cavity (310), and the gas supply pipeline (100) is communicated with the gas storage cavity (310);
The side part of the water treatment unit is provided with a water-proof weir plate (400) and a water outlet weir plate (500); 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), an air outlet (230) of the air outlet pipe (270) is arranged between the water-proof weir plate (400) and the water-out weir plate (500), and/or the water-out weir plate (500) extends upwards from the bottom to a direction far away from the water treatment unit;
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).
2. The intensive treatable MABR constructed wetland device according to claim 1, wherein: the cross-sectional area of the gas collection box (300) gradually decreases from top to bottom.
3. The intensive treatable MABR constructed wetland device according to claim 1, wherein: the gas collecting box (300) is provided with a groove body (330), the water inlet is arranged at the bottom of the groove body (330), and the water inlet is provided with a filter screen; the filler layer (260) is disposed in the channel (330).
4. The intensive treatable MABR constructed wetland device according to claim 1, wherein: a permeable layer II (244) is arranged between the middle layer (242) and the supporting layer (241) of the fiber membrane filaments (240), the thickness of the permeable layer II (244) is H 3, the thickness of the middle layer (242) is H 4,H3:H4 =0.1-0.5, and/or
The thickness of the intermediate layer (242) of the fiber membrane filaments (240) is H 4,H4 =20-100 μm, and the thickness of the surface layer (243) is H 2,H2 =0.5-10 μm.
5. The intensive treatable MABR constructed wetland device according to claim 1, wherein: the average pore diameter of the side, far away from the supporting layer (241), of the middle layer (242) of the fiber membrane wires (240) is P 1, and the average pore diameter of the side, which is contacted with the supporting layer (241), of the middle layer (242) is P 2,P1＜P2.
6. The intensive treatable MABR constructed wetland device according to claim 1, wherein: the vertical height of the water-separating weir plate (400) is larger than that of the water-outlet weir plate (500).
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| CN212403884U (en) * | 2020-07-16 | 2021-01-26 | 光大水务科技发展（南京）有限公司 | MABR constructed wetland device capable of being treated in enhanced mode |
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