CN117776401A - Anti-clogging subsurface flow wetland system - Google Patents
Anti-clogging subsurface flow wetland system Download PDFInfo
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- CN117776401A CN117776401A CN202410210962.3A CN202410210962A CN117776401A CN 117776401 A CN117776401 A CN 117776401A CN 202410210962 A CN202410210962 A CN 202410210962A CN 117776401 A CN117776401 A CN 117776401A
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- Treatment Of Biological Wastes In General (AREA)
Abstract
The application provides a prevent silting up undercurrent wetland system, include: the subsurface flow wetland is used for filtering sewage; a water collection well for collecting filtered water; a water collecting pipeline, which is provided with a water inlet and a water outlet, wherein the water inlet is communicated with the bottom of the subsurface flow wetland, the water outlet extends downwards and stretches into the water collecting well, and the water collecting pipeline is used for discharging the filtered water into the water collecting well; the water pump is arranged in the water collecting well and is used for pumping out the filtered water; and the controller is electrically connected with the water pump and is configured to control the water pump to be started when the water level of the water collecting well reaches a height threshold value, and the height threshold value is not smaller than the height of the water outlet. The anti-clogging subsurface flow wetland system can solve the problems of high treatment difficulty and high operation and maintenance cost of the existing subsurface flow wetland waste.
Description
Technical Field
The application relates to the technical field of sewage treatment equipment, in particular to a blockage-preventing subsurface flow wetland system.
Background
Subsurface flow wetlands are a type of constructed wetlands that are more commonly used. The subsurface flow wetland is an artificial landscape which takes hydrophilic plants as surface greening matters, takes sand and stone soil as filler or filter material and allows water to naturally permeate and filter. The novel water-free floor system is characterized by no surface water, small occupied area, high utilization rate and convenient maintenance, and is popular with people. The filtering material of the subsurface flow wetland tank body is filtered as a water treatment core process of the artificial wetland, and the filtering material is used for a long time to cause sludge accumulation to block the pores of the filtering material, so that the service life of the filtering material is reduced, and the blocking of the filtering material can cause the water treatment capacity of the artificial wetland to be reduced. At present, the conventional method is to replace and back flush the filter material, but the treatment mode has the problems of high waste treatment difficulty and high operation and maintenance cost.
Disclosure of Invention
The embodiment of the application at least provides a blocking-preventing subsurface flow wetland system, which can solve the problems of high treatment difficulty and high operation and maintenance cost of the existing subsurface flow wetland waste.
The embodiment of the application provides a prevent stifled undercurrent wetland system, include:
the subsurface flow wetland is used for filtering sewage;
a water collection well for collecting filtered water;
a water collecting pipeline, which is provided with a water inlet and a water outlet, wherein the water inlet is communicated with the bottom of the subsurface flow wetland, the water outlet extends downwards and stretches into the water collecting well, and the water collecting pipeline is used for discharging the filtered water into the water collecting well;
the water pump is arranged in the water collecting well and is used for pumping out the filtered water;
and the controller is electrically connected with the water pump and is configured to control the water pump to be started when the water level of the water collecting well reaches a height threshold value, and the height threshold value is not smaller than the height of the water outlet.
In an alternative embodiment, the water collection pipe is provided with a vent hole, which is closed when the water pump is turned on.
In an alternative embodiment, the vent is located within the water collection well;
the controller is specifically configured to control the water pump to be turned on when the water level of the water collection well reaches the height of the vent hole.
In an alternative embodiment, the water collecting pipeline comprises a water inlet pipe section, the water inlet pipe section is buried at the bottom of the subsurface flow wetland, the water collecting pipeline comprises a main pipeline and a plurality of branch pipelines, the branch pipelines are respectively connected to two sides of the main pipeline, and the branch pipelines are provided with a plurality of water inlets.
In an alternative embodiment, an intelligent pressure control valve is arranged between the main pipeline and the branch pipeline, and the intelligent pressure control valve is used for balancing the negative pressure of the branch pipeline.
In an alternative embodiment, the water collection pipe is provided with a valve.
In an alternative embodiment, the anti-clogging subsurface flow wetland system further comprises a water distribution pipeline, wherein a water outlet of the water distribution pipeline is positioned at an upper opening of the subsurface flow wetland, and the water distribution pipeline is used for uniformly distributing the sewage in the subsurface flow wetland.
In an alternative embodiment, the anti-clogging subsurface flow wetland system further comprises a water distribution tank located upstream of the water distribution pipe, the water distribution tank being arranged to be able to drain the sewage when its water level reaches a specified position.
In an alternative embodiment, the water distribution tank is provided with a dosing device for dosing bacillus into the sewage.
In an alternative embodiment, the water distribution tank is provided with an oxygenation device for increasing the dissolved oxygen content of the sewage.
In an alternative embodiment, the anti-clogging subsurface flow wetland system further comprises a centrifugal treatment device, wherein the centrifugal treatment device is positioned at the upstream of the water distribution pipeline and is used for carrying out centrifugal treatment on the sewage.
In an alternative embodiment, the anti-clogging subsurface flow wetland system further comprises a greenhouse, wherein the greenhouse is arranged around the subsurface flow wetland in a surrounding manner, and the greenhouse is used for insulating the subsurface flow wetland.
The technical scheme of the application has the following beneficial technical effects:
according to the anti-clogging subsurface flow wetland system, the water pump is started when the water level of the water collecting well reaches a height not lower than the water outlet of the water collecting pipeline, negative pressure can be generated in the water collecting pipeline, and along with the reduction of the water level, the negative pressure in the water collecting pipeline is higher and higher. By the arrangement, the permeability coefficient of the subsurface wetland can be improved, so that the scouring force of downward flow of the water body can be improved, and the possibility of clogging is reduced. In addition, as the permeability coefficient of the subsurface flow wetland is improved, the water permeability rate is increased, so that the content of dissolved oxygen in the water can be ensured, the possibility of anaerobic environment generation is eliminated, and the generation of anaerobic greenhouse gases is reduced.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are necessary for use in the embodiments are briefly described below, which drawings are incorporated in and form a part of the present description, these drawings illustrate embodiments consistent with the present application and together with the description serve to explain the technical solutions of the present application. It is to be understood that the following drawings illustrate only certain embodiments of the present application and are therefore not to be considered limiting of its scope, for the person of ordinary skill in the art may derive other relevant drawings from the drawings without inventive effort.
FIG. 1 shows a schematic structural diagram of a anti-clogging subsurface flow wetland system provided by an embodiment of the present application;
fig. 2 shows a schematic structural diagram of a subsurface wetland provided in an embodiment of the present application;
FIG. 3 shows a schematic view of the structure of a water collection pipe provided in an embodiment of the present application;
fig. 4 shows a schematic structural diagram of a water distribution pipe according to an embodiment of the present application;
reference numerals:
1. subsurface flow wetland; 11. a vegetation layer; 11a, a soil layer; 11b, a sand layer; 12. a filler layer; 12a, an upper packing layer; 12b, a lower packing layer; 13. a sand filtering layer; 2. a water collection well; 3. a water collecting pipe; 31. a main pipe; 32. a branch pipe; 33. an intelligent pressure control valve; 4. a water pump; 5. a controller; 6. a vent hole; 7. a valve; 8. a water distribution pipeline; 81. a water distribution main pipe; 82. a water distribution branch pipe; 9. a water distribution tank; 10. and a centrifugal processing device.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.
It should be noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present specification should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of the terms "first," "second," and the like in one or more embodiments of the present description does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
Subsurface flow wetlands are a type of constructed wetlands that are more commonly used. The subsurface flow wetland is an artificial landscape which takes hydrophilic plants as surface greening matters, takes sand and stone soil as filler or filter material and allows water to naturally permeate and filter. The novel water-free floor system is characterized by no surface water, small occupied area, high utilization rate and convenient maintenance, and is popular with people. The filtering material of the subsurface flow wetland tank body is filtered as a water treatment core process of the artificial wetland, and the filtering material is used for a long time to cause sludge accumulation to block the pores of the filtering material, so that the service life of the filtering material is reduced, and the blocking of the filtering material can cause the water treatment capacity of the artificial wetland to be reduced. At present, the conventional method is to replace and back flush the filter material, but the treatment mode has the problems of high waste treatment difficulty and high operation and maintenance cost.
Therefore, the embodiment of the application provides a blocking-preventing subsurface flow wetland system so as to solve the problems of high treatment difficulty and high operation and maintenance cost of the existing subsurface flow wetland waste.
For the purposes, technical solutions and advantages of the present application, the following detailed description will be made with reference to specific drawings and embodiments.
Referring to fig. 1, an anti-clogging subsurface flow wetland system provided in an embodiment of the present application includes a subsurface flow wetland 1, a water collection well 2, and a water collection pipe 3. Wherein, the undercurrent wetland 1 is used for filtering sewage. The water collection well 2 is used for collecting filtered water. The water collecting pipeline 3 is provided with a water inlet and a water outlet, the water inlet is communicated with the bottom of the subsurface flow wetland 1, the water outlet extends downwards and stretches into the water collecting well 2, and the water collecting pipeline 3 is used for discharging filtered water into the water collecting well 2.
Referring to fig. 2, in some possible embodiments, the subsurface flow wetland 1 comprises a filler layer 12 and a vegetation layer 11 laid on the filler layer 12.
The packing layer 12 uses cobbles or gravel as a packing. Illustratively, as shown in FIG. 2, filler layer 12 includes an upper filler layer 12a and a lower filler layer 12b. The upper packing layer 12a is filled with cobbles or gravels with the particle size of 1-2cm, and the thickness of the upper packing layer 12a is 200-500mm. The filler of the lower filler layer 12b is paved by cobblestones or common stones with the particle size of 2-4cm, and the thickness of the lower filler layer 12b is 200-500mm. The sewage containing dissolved oxygen flows through the filler layer 12, and the soluble nutrient substances gradually form an aerobic biomembrane, so that the anaerobic formation of thicker anaerobic flocs due to the anaerobic of the water body is avoided.
The vegetation layer 11 is used for planting aquatic plants such as cress. Illustratively, as shown in FIG. 2, the vegetation layer 11 includes a soil layer 11a and aquatic plants planted in the soil layer 11a, the soil layer 11a has a thickness of 350-500mm and a soil porosity of 46.4%. On the one hand, the aquatic plants can directly absorb N, P and other nutrient elements from the sewage, and on the other hand, the aquatic plants can promote the growth of microorganisms, so that the decomposition speed of organic matters is increased.
In some possible embodiments, a high strength nonwoven is provided between the filler layer 12 and the vegetation layer 11. Illustratively, 100g per square meter of high strength non-woven fabric is laid between the filler layer 12 and the vegetation layer 11. By the arrangement, the plant root system and sand in the soil layer 11a can be prevented from entering the packing layer 12, and the plant root system is prevented from entering the packing layer 12 and blocking the packing layer 12 by attachments, so that the filtering performance is affected.
Referring to fig. 2, in some possible embodiments, the vegetation layer 11 further comprises a sand layer 11b located at the bottom of the soil layer 11 a. That is, the sand layer 11b is located between the soil layer 11a and the filler layer 12/high strength nonwoven fabric. Illustratively, the sand layer 11b is made of river sand, and the thickness of the sand layer 11b is 30-150mm. This arrangement can prevent the nonwoven fabric from being broken due to impurities in the soil layer 11 a.
In some possible embodiments, a well-drilling cloth is provided between the sand layer 11b and the filler layer 12. Illustratively, a well construction cloth is positioned between the high strength nonwoven and the filler layer 12. The high-strength non-woven fabrics and the packing layer 12 can be isolated, so that river sand is prevented from blocking the packing layer 12 through the high-strength non-woven fabrics, and the filtering efficiency is reduced.
Referring to fig. 2, in some possible embodiments, the bottom of the filler layer 12 is provided with a sand filter layer 13. Illustratively, the sand filter layer 13 is made of stone nitrate with a particle size of 5-10mm. By the arrangement, small particles such as river sand can be prevented from blocking the water inlet of the water collecting pipeline 3.
Referring to fig. 2, in some possible embodiments, a portion of the water collecting pipe 3 is embedded in the sand filter layer 13, and the water collecting pipe 3 embedded in the sand filter layer 13 has a certain water conservancy gradient. Illustratively, the water collecting pipe 3 comprises a water inlet pipe section embedded in the sand filter layer 13, which water inlet pipe section has a water conservancy gradient of 0.005-0.010 towards the water collecting well 2. This arrangement enables the filtered water to be discharged into the water collection well 2 in time. In addition, the filtered water can be collected more quickly and efficiently by increasing the number of the water inlets. For example, as shown in fig. 3, the water inlet pipe section includes a main pipe 31 and a plurality of branch pipes 32, the branch pipes 32 are respectively connected to two sides of the main pipe 31, and the branch pipes 32 are uniformly distributed with a plurality of water inlets.
In a specific arrangement, an intelligent pressure control valve 33, such as a flow valve, can be arranged between the main pipeline 31 and the branch pipelines 32 to balance the negative pressure in all the branch pipelines 32, so that the overall permeability coefficient of the subsurface flow wetland 1 is more balanced, and the influence on the treatment efficiency of the subsurface flow wetland 1 due to local blockage caused by too small local negative pressure can be avoided.
When specifically setting up, the trunk line 31 can set up the observation well with branch pipeline 32 phase position, and the observation well lower extreme is linked together with trunk line 31, and the observation well upper end extends to above the surface of water (the surface of water of undercurrent wetland) and makes sealing means, makes things convenient for the maintenance personal to get into in order to carry out pipeline maintenance work.
Referring to fig. 1, in some possible embodiments, the anti-clogging subsurface flow wetland system further comprises a water pump 4 and a controller 5. Wherein, water pump 4 sets up in sump pit 2, and water pump 4 is used for pumping the filtration water. The controller 5 is electrically connected to the water pump 4, the controller 5 being configured to control the water pump 4 to be turned on when the water level of the water collection well 2 reaches a height threshold. The height threshold is not less than the height of the water outlet of the water collecting pipeline 3. The difference in height of the height threshold and the water outlet of the water collecting pipe 3 is 500mm, for example. When the water level of the water collection well 2 reaches the height threshold, the controller 5 controls the water pump 4 to be turned on, the water pump 4 pumps the filtered water out of the water collection well 2, and negative pressure is generated in the water collection pipeline 3, and as the water level is reduced, the negative pressure is higher and higher. By the arrangement, the permeability coefficient of the subsurface flow wetland 1 can be improved, so that the scouring force of downward water flow can be improved, and the possibility of clogging is reduced. In addition, as the permeability coefficient of the subsurface flow wetland 1 is improved, the water permeability rate is increased, so that the content of dissolved oxygen in the water can be ensured, the possibility of anaerobic environment generation is eliminated, and the generation of anaerobic greenhouse gases is reduced.
In actual operation, the subsurface flow wetland 1 system manufactured by the arrangement mode of the embodiment performs water filtering operation. The vegetation layer 11 has a thickness of 500mm and a soil porosity of 46.4%. The filler layers 12 each have a thickness of 500mm. The grain diameter of the stone at the bottom of the packing layer 12 is 5-10mm. The branch pipeline 32 of the water collecting pipeline 3 adopts a sand-free pit water reducing pipe with the diameter of 250mm, the main pipeline 31 of the water collecting pipeline 3 adopts a solid pipeline with the diameter of 500mm, and the main pipeline 31 of the water collecting pipeline 3 bends downwards by 90 degrees to extend into the water collecting well 2. At the initial stage of use, the water pump 4 is not started, no negative pressure exists in the water collecting pipeline 3, the permeability coefficient of the subsurface flow wetland 1 is 9.5 x 10 < -7 > m/s (according to the permeability coefficient formula K=QL/A delta ht, data are all derived from experimental data), when the water level of the water collecting well 2 is higher than the height of a water outlet of the water collecting pipeline 3, and the difference value between the water level of the water collecting well 2 and the height of the water outlet of the water collecting pipeline 3 is 500mm, the water pump 4 is started, the negative pressure is generated in the water collecting pipeline 3, the permeability coefficient of the subsurface flow wetland 1 reaches 1.7 x 10 < -6 > m/s, and the permeability coefficient increases with the decrease of the water level before the water level decreases to the water outlet of the water collecting pipeline 3. In the process, as the permeability coefficient of the subsurface flow wetland 1 is increased, the scouring force of the downward flow of the water body can be improved, and the possibility of clogging is reduced.
When the water level of the water collecting well 2 is higher than the water outlet of the water collecting pipeline 3, the water outlet of the water collecting pipeline 3 is in a sealed state, and the water pump 4 is started at the moment, so that negative pressure can be generated in the water collecting pipeline 3. When the water level of the water collecting well 2 is lower than the water outlet of the water collecting pipeline 3, the water outlet of the water collecting pipeline 3 is exposed, and at the moment, the water pump 4 is started to not generate negative pressure in the water collecting pipeline 3.
In one possible embodiment, the anti-clogging subsurface flow wetland 1 further comprises a water level detection device. Specifically, the water level detection device is disposed in the water collecting well 2 and electrically connected to the controller 5, and is configured to detect water level information of the water collecting well 2, and transmit the water level information to the controller 5, so that the controller 5 controls the water pump 4 to start or stop according to the water level information. Illustratively, the water level detecting means includes a first detector for detecting the first water level information and a second detector for detecting the second water level information, and the controller 5 may control the water pump 4 to be turned on according to the first water level information and may control the water pump 4 to be turned off according to the second water level information.
Referring to fig. 1, in one possible embodiment, the water collection pipe 3 is provided with a vent 6. Illustratively, the vent 6 is located within the sump 2, and the height of the vent 6 is greater than the height of the water outlet of the sump 3. For example, the vent 6 is located at a downwardly curved node of the water collection pipe 3. In the use process, when the water pump 4 is not started and the water level of the water collecting well 2 is higher than the water outlet of the water collecting pipeline 3, the filtered water possibly flows back to the subsurface wetland 1, and the water collecting pipeline 3 is provided with the vent hole 6, so that negative pressure in the water collecting pipeline 3 can be avoided, and the back flow of the filtered water can be avoided. It will be appreciated that the vent 6 should be closed when it is desired to create a negative pressure in the water collection pipe 3, i.e. when the water pump 4 is started.
In one possible embodiment, the controller 5 is specifically configured to control the water pump 4 to be turned on when the water level of the water collection well 2 reaches the level of the ventilation hole 6. The difference in height of the vent 6 and the height of the water outlet of the water collecting pipe 3 is 500mm, for example. When filtered water overflows from the vent hole 6, i.e. the water level of the water collection well 2 reaches the height of the vent hole 6, the controller 5 can control the water pump 4 to be turned on.
Referring to fig. 1, in one possible embodiment, the water collection pipe 3 is provided with a valve 7. Illustratively, a valve 7 is provided on the water collection pipe 3 and is located between the water collection well 2 and the subsurface flow wetland 1. This arrangement can facilitate manual operation of the valve 7. In particular use, the water collection well 2 or the equipment in the water collection well 2 can be serviced by closing the valve 7 and without stopping the discharge of sewage.
Referring to fig. 1 and 4, in one possible embodiment, the anti-clogging subsurface flow wetland system further comprises a water distribution pipe 8, wherein a water outlet of the water distribution pipe 8 is positioned at an upper opening of the subsurface flow wetland 1, and the water distribution pipe 8 is configured to uniformly distribute sewage in the subsurface flow wetland 1. As shown in fig. 4, the water distribution pipeline 8 includes two main water distribution pipes 81 and a plurality of branch water distribution pipes 82, the two main water distribution pipes 81 are arranged at the upper opening of the subsurface flow wetland 1 at intervals in parallel along the first direction, the branch water distribution pipes 82 are arranged between the two main water distribution pipes 81 at intervals in parallel along the second direction, and two ends of the branch water distribution pipes 82 are respectively communicated with the main water distribution pipes 81 at two ends. When domestic sewage is discharged into the main water distribution pipe 81, the domestic sewage can be uniformly distributed on the subsurface flow wetland 1 through (water distribution ports of) the water distribution branch pipes 82. The water flow directions of the two main water distribution pipes 81 may be opposite, so that the pressure of each branch water distribution pipe 82 is uniform, and the sewage can be uniformly distributed in the vegetation layer 11. It should be understood that the water distribution pipes 8 may be one or more groups, and may be specifically determined according to the area of the subsurface wetland 1.
Referring to fig. 1, in one possible embodiment, the anti-clogging subsurface flow wetland system further comprises a water distribution tank 9, wherein the water distribution tank 9 is located upstream of the water distribution pipeline 8, and an exemplary water inlet of the water distribution tank 9 is communicated with an upstream sewage outlet, and a water outlet of the water distribution tank 9 is communicated with a water inlet of the water distribution pipeline 8. Specifically, the water distribution tank 9 may serve as a transfer device for sewage, and the sewage may be accumulated in the water distribution tank 9 before entering the water distribution pipe 8.
In one possible embodiment, the water distribution tank 9 is arranged to be able to drain the sewage when its water level reaches a specified position. The water distribution tank 9 is provided with a liquid level control device and an electromagnetic valve positioned at the water outlet of the water distribution tank 9, and the liquid level control device can control the electromagnetic valve to open or close the water outlet of the water distribution tank 9 according to liquid level information detected by a liquid level meter. That is, the water distribution tank 9 can realize quantitative discharge of sewage. In addition, the water distribution tank 9 can realize quantitative discharge of sewage, so that the system can quantitatively treat the sewage in the water distribution tank 9. For example, dosing, oxygenation. Compared with a mode of treating sewage in real time, the quantitative treatment can reduce the sewage treatment difficulty and reduce the energy consumption.
In one possible embodiment, the water distribution tank 9 is provided with a dosing device for dosing bacillus into the sewage. When the bacillus is specifically used, the bacillus can form a probiotic environment in soil, so that the soil porosity is increased. Bacillus can humidify organic matters in soil to convert ineffective phosphorus into effective phosphorus which can be absorbed by crops. In addition, the bacillus can also produce auxin to promote the plant root system to be in explosive extension growth, and the auxin and the root system form a fungus bed together, so that the purpose of quickly and efficiently decomposing and absorbing nutrient substances is achieved.
In one possible embodiment, the water distribution tank 9 is provided with an oxygenation device for increasing the dissolved oxygen content of the sewage. When the aerator is specifically used, the dissolved oxygen content of the sewage can be increased by the aeration mode, so that the sewage is kept in an aerobic state, and thicker anaerobic flocs are avoided from being formed by the anaerobic secondary water body.
In one possible implementation mode, the anti-clogging subsurface flow wetland system further comprises a greenhouse, wherein the greenhouse is arranged around the subsurface flow wetland 1 and is used for insulating the subsurface flow wetland 1. Therefore, the temperature of the water body can be kept as much as possible, the influence on the treatment efficiency of the subsurface wetland 1 caused by the reduction of the temperature of the water body is avoided, and the method is particularly suitable for climates with clear northern four seasons. In addition, the energy consumption can be reduced by the arrangement relative to the mode of heating the water body.
Referring to fig. 1, in one possible embodiment, the anti-clogging subsurface flow wetland system further comprises a centrifugal treatment device 10, wherein the centrifugal treatment device 10 is located upstream of the water distribution pipeline 8, and the centrifugal treatment device 10 is used for carrying out centrifugal treatment on sewage. Illustratively, the water inlet of the centrifugal treatment device 10 is communicated with an upstream sewage outlet, and the water outlet of the centrifugal treatment device 10 is communicated with the water inlet of the water distribution tank 9. Specifically, before the sewage enters the subsurface flow wetland 1, the centrifugal treatment device 10 may perform centrifugal treatment on the sewage, for example, the centrifugal treatment device 10 may activate water molecules in the sewage, trap large-particle suspended matters in the sewage, simultaneously cut large-molecular chain soluble nutrients in the sewage into small-molecular chain substances, and increase dissolved oxygen in the water body, so that the water body is maintained in an aerobic state.
The operation process of the anti-clogging subsurface flow wetland system comprises the following steps: the domestic sewage flows into the water distribution tank 9 after passing through the centrifugal treatment device 10, and macromolecular pollutants are removed, and the effect of water-gas fusion is achieved, so that the water body has a large amount of dissolved oxygen; after the sewage after centrifugal treatment flows into the water distribution tank 9, dissolved oxygen is added into the sewage in the water distribution tank 9 by utilizing an oxygenation device in the water distribution tank 9, and meanwhile, bacillus is added into the sewage in the water distribution tank 9 by utilizing a dosing device in the water distribution tank 9, wherein the bacillus is specifically added with bacillus subtilis liquid with the content of 200 hundred million/ml, and the bacillus is thrown in according to 300 ml/mu; the sewage after adding the chemicals and increasing oxygen is uniformly distributed on the subsurface flow wetland 1 through a water distribution pipeline 8, and filtered water is collected in a sand filtering layer 13 after being filtered by a vegetation layer 11 and a packing layer 12; discharging the filtered water into the water collecting well 2 through the water collecting pipeline 3, and stopping the water pump 4 to gradually increase the water level of the water collecting well 2; when the water level reaches a set height (such as the height of the vent hole 6), the vent hole 6 is closed, the water pump 4 is started, filtered water in the water collecting well 2 is pumped out by the water pump 4, and the water pump 4 is stopped when the water level of the water collecting well 2 reaches the height of the water outlet of the water collecting pipeline 3. In the process of starting the water pump 4, continuously increased negative pressure is generated in the water collecting pipeline 3, and meanwhile, the permeability coefficient of the subsurface flow wetland 1 is continuously increased, so that the scouring force of downward flowing water is enhanced, and the possibility of clogging can be reduced.
According to the anti-clogging subsurface flow wetland system, the water pump 4 is started when the water level of the water collecting well 2 reaches a height not lower than the water outlet of the water collecting pipeline 3, negative pressure can be generated in the water collecting pipeline 3, and the negative pressure in the water collecting pipeline 3 is higher and higher along with the reduction of the water level. By the arrangement, the permeability coefficient of the subsurface flow wetland 1 can be improved, so that the scouring force of downward water flow can be improved, and the possibility of clogging is reduced. In addition, as the permeability coefficient of the subsurface flow wetland 1 is improved, the water permeability rate is increased, so that the content of dissolved oxygen in the water can be ensured, the possibility of anaerobic environment generation is eliminated, and the generation of anaerobic greenhouse gases is reduced.
The present disclosure is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the one or more embodiments of the invention, are therefore intended to be included within the scope of the present application.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes or substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A anti-clogging subsurface flow wetland system, comprising:
the subsurface flow wetland is used for filtering sewage;
a water collection well for collecting filtered water;
a water collecting pipeline, which is provided with a water inlet and a water outlet, wherein the water inlet is communicated with the bottom of the subsurface flow wetland, the water outlet extends downwards and stretches into the water collecting well, and the water collecting pipeline is used for discharging the filtered water into the water collecting well;
the water pump is arranged in the water collecting well and is used for pumping out the filtered water;
and the controller is electrically connected with the water pump and is configured to control the water pump to be started when the water level of the water collecting well reaches a height threshold value, and the height threshold value is not smaller than the height of the water outlet.
2. The anti-clogging subsurface flow wetland system according to claim 1, wherein said water collection pipe is provided with a vent hole that is closed when said water pump is turned on.
3. The anti-clogging subsurface flow wetland system according to claim 2 wherein said vent is located within said water collection well;
the controller is specifically configured to control the water pump to be turned on when the water level of the water collection well reaches the height of the vent hole.
4. The anti-clogging subsurface flow wetland system according to claim 1, wherein said water collection pipe comprises a water inlet pipe section buried in the bottom of said subsurface flow wetland, said water collection pipe comprises a main pipe and a plurality of branch pipes, said branch pipes are respectively connected to both sides of said main pipe, and said branch pipes are provided with a plurality of water inlets.
5. The anti-clogging subsurface flow wetland system according to claim 4, wherein an intelligent pressure control valve is provided between said main pipe and said branch pipe, said intelligent pressure control valve being used for equalizing the negative pressure of said branch pipe.
6. The anti-clogging subsurface flow wetland system according to claim 1, wherein said water collection pipe is provided with a valve.
7. The anti-clogging subsurface flow wetland system of any one of claims 1-6 further comprising a water distribution conduit, wherein a water outlet of said water distribution conduit is positioned at an upper port of said subsurface flow wetland, said water distribution conduit being configured for evenly distributing said wastewater across said subsurface flow wetland.
8. The anti-clogging subsurface flow wetland system according to claim 7, further comprising a water distribution tank located upstream of said water distribution pipe, said water distribution tank being configured to drain said wastewater when its water level reaches a designated location.
9. The anti-clogging subsurface flow wetland system according to claim 7, further comprising a centrifugal treatment device, said centrifugal treatment device being located upstream of said water distribution pipe, said centrifugal treatment device being for centrifuging said wastewater.
10. The anti-clogging subsurface flow wetland system according to any one of claims 1-6, further comprising a greenhouse surrounding said subsurface flow wetland, said greenhouse being used for maintaining said subsurface flow wetland.
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