CN114835349A - Modularized sewage treatment device based on artificial wetland and treatment method thereof - Google Patents
Modularized sewage treatment device based on artificial wetland and treatment method thereof Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 238000005273 aeration Methods 0.000 claims abstract description 53
- 239000002689 soil Substances 0.000 claims abstract description 41
- 238000004062 sedimentation Methods 0.000 claims abstract description 26
- 239000010802 sludge Substances 0.000 claims abstract description 23
- 238000000746 purification Methods 0.000 claims abstract description 10
- 241000196324 Embryophyta Species 0.000 claims description 28
- 238000007599 discharging Methods 0.000 claims description 5
- 230000001376 precipitating effect Effects 0.000 claims description 4
- 239000012716 precipitator Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 235000011299 Brassica oleracea var botrytis Nutrition 0.000 claims description 3
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- 235000009328 Amaranthus caudatus Nutrition 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- 241000195940 Bryophyta Species 0.000 claims 1
- 239000008213 purified water Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Hydrology & Water Resources (AREA)
- Biotechnology (AREA)
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- Biodiversity & Conservation Biology (AREA)
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Abstract
The invention belongs to the field of ecological sewage treatment, and discloses a modular sewage treatment device based on an artificial wetland and a treatment method thereof; the modularized sewage treatment device comprises a sedimentation tank (100), a water pump (110), an aeration tank (200), a first artificial wetland module (300), a second artificial wetland module (400), a third artificial wetland module (500), a water purification tank (600), a baffle (700), a filter screen (710), a pebble layer (720), an active sludge layer (730), a raw soil layer (740), a first aquatic plant layer (750) and a second aquatic plant layer (760); the invention fully combines the ecological purification capacity of the artificial wetland and the original equipment of the sewage treatment plant, skillfully combines the ecological purification capacity of the artificial wetland and the original equipment of the sewage treatment plant, realizes continuous sewage treatment, reduces the dosage of sewage treatment chemical reagents, and has good sewage treatment effect and outstanding environmental protection effect.
Description
Technical Field
The invention belongs to the field of ecological sewage treatment, and discloses a modular sewage treatment device based on an artificial wetland and a treatment method thereof.
Background
Sewage treatment (sewage treatment, water treatment): the sewage is purified to reach the water quality requirement of being discharged into a certain water body or being reused. Sewage treatment is widely applied to various fields such as building, agriculture, traffic, energy, petrifaction, environmental protection, urban landscape, medical treatment, catering and the like, and is increasingly used in daily life of common people. The sewage treatment is generally classified into production sewage treatment and domestic sewage treatment according to the classification of sewage sources. The production sewage comprises industrial sewage, agricultural sewage, medical sewage and the like, and the domestic sewage is sewage generated in daily life, and refers to complex mixtures of various forms of inorganic matters and organic matters, and comprises the following steps: floating and suspended large and small solid particles; ② colloidal and gelatinous dispersions; ③ pure solution. There are two types of water pollution, based on the nature of the water pollution: one is natural pollution; the other is artificial pollution, and the current water body is greatly damaged by the artificial pollution. Water pollution can be mainly classified into chemical pollution, physical pollution and biological pollution according to different pollution impurities. The pollutants are mainly: the method comprises the steps of discharging the untreated industrial wastewater; domestic sewage which is discharged without treatment is obtained; the farmland sewage with a large amount of fertilizer, pesticide and herbicide is used; fourthly, industrial waste and household garbage stacked beside a river are obtained; fifthly, water and soil loss; sixthly, mine sewage.
The methods for treating sewage are various, and can be generally classified into physical methods, chemical methods, biological methods and the like. Sewage treatment plant: some investigators have more serious problems in 100 large treatment plants, such as insufficient capital, high cost, low efficiency and the like, and the general efficiency is less than 70% and is only 40% lower. Cost and energy consumption of sewage treatment: basically, the energy consumption is high and the efficiency is low. The village and town sewage mainly comprises domestic sewage and agricultural wastewater. The domestic sewage has fixed components, mainly contains organic matters such as carbohydrate, protein, amino acid, fat and the like, is more suitable for the growth of bacteria, and becomes a place for the survival and propagation of bacteria and viruses; but the domestic sewage generally does not contain toxicity, has certain fertilizer efficiency and can be used for irrigating farmlands. The artificial wetland is a technology for treating sewage and sludge by using the physical, chemical and biological triple synergistic action of soil, artificial medium, plants and microorganisms in the process of flowing along a certain direction by using sewage and sludge which are controllably dosed to the artificially constructed wetland from the artificially constructed and controlled-operation ground similar to the marshland. The action mechanism of the plant nutrient solution comprises the actions of adsorption, detention, filtration, oxidation reduction, precipitation, microbial decomposition, transformation, plant shielding, residue accumulation, transpiration moisture and nutrient absorption and various animals.
How to establish an efficient artificial wetland sewage treatment device is a hot problem which needs to be researched and solved urgently at present.
Disclosure of Invention
In order to solve the problems, the invention provides a modular sewage treatment device based on an artificial wetland and a treatment method thereof.
The technical scheme is as follows:
a modularized sewage treatment device based on an artificial wetland comprises a sedimentation tank, a water pump, an aeration tank, a first artificial wetland module, a second artificial wetland module, a third artificial wetland module, a water purification tank, a baffle plate, a filter screen, a pebble layer, an active sludge layer, an original soil layer, a first aquatic plant layer and a second aquatic plant layer; the sedimentation tank is a cylindrical container, the water pump is arranged on the right side of the sedimentation tank, and the aeration tank is arranged on the right side of the water pump; the pipeline of the water pump is communicated with the top of the sedimentation tank and the bottom of the aeration tank; the first artificial wetland module is arranged on the right side of the aeration tank and is separated by a baffle; the artificial wetland module is a cylindrical open container, the opening height of the first artificial wetland module is lower than that of the aeration tank, and the top of the first artificial wetland module is provided with the filter screen; the pebble layer, the active sludge layer and the original soil layer are sequentially paved upwards at the bottom of the first artificial wetland module; the second artificial wetland module is arranged on the right side of the first artificial wetland module and is lower than the first artificial wetland module in height, and the second artificial wetland module also comprises a pebble layer, an active sludge layer and an original soil layer; a layer of aquatic plants is arranged on the original soil layer; the third artificial wetland module is arranged on the right side of the second artificial wetland module; the height of the artificial wetland module is lower than that of the second artificial wetland module, and the artificial wetland module also comprises a pebble layer, an active sludge layer and an original soil layer, wherein the original soil layer is provided with a second layer of aquatic plants; the clean water tank is arranged on the right side of the third artificial wetland module and is lower than the third artificial wetland module in height.
Furthermore, the top parts of the second constructed wetland module and the third constructed wetland module are provided with the filter screens.
Further, according to the modular sewage treatment device based on the artificial wetland, the meshes of the filter screens at the tops of the first artificial wetland module, the second artificial wetland module and the third artificial wetland module are reduced in proportion.
Further, above-mentioned modularization sewage treatment plant based on constructed wetland, the mesh diameter of the filter screen of first constructed wetland module, second constructed wetland module and third constructed wetland module top is 15mm, 10mm and 5mm in proper order.
Further, according to the modular sewage treatment device based on the artificial wetland, the cauliflower and the golden fish algae are planted on one layer of the aquatic plants.
Furthermore, according to the modular sewage treatment device based on the artificial wetland, the potamogeton sericea and the myriophyllum spicatum are planted in the two layers of the aquatic plants.
Further, according to the modularized sewage treatment device based on the artificial wetland, the thicknesses of the pebble layer, the active sludge layer and the original soil layer are 50cm, 70cm and 120cm in sequence.
Further, according to the modular sewage treatment device based on the artificial wetland, the soil in the original soil layer is sandy soil.
Further, above-mentioned modularization sewage treatment plant based on constructed wetland, be provided with quality of water verifying attachment in the clean water basin, be provided with circulating water pump behind the clean water basin, circulating water pump passes through the pipeline intercommunication the bottom of aeration tank.
Further, the treatment method of the modular sewage treatment device based on the artificial wetland comprises the following steps:
1) discharging the urban domestic sewage into a sedimentation tank through a pipeline, adding a precipitator, and precipitating for 48-96 h;
2) pumping water at the top of the sedimentation tank into the bottom of the aeration tank through a water pump, and carrying out blast aeration for the time and the steps;
3) and 2) after aeration is finished, starting the water pump again, enabling the water at the top of the aeration tank to flow into the first artificial wetland module, the second artificial wetland module and the third artificial wetland module in sequence, and controlling the flow rate in cooperation with the aeration step in the step 2), namely enabling the water to fill the empty aeration tank within the aeration time, so that continuous sewage treatment can be carried out.
Compared with the prior art, the invention has the following beneficial effects: the invention fully combines the ecological purification capacity of the artificial wetland and the original equipment of the sewage treatment plant, skillfully combines the ecological purification capacity and the original equipment of the sewage treatment plant, realizes continuous sewage treatment, reduces the dosage of sewage treatment chemical reagents, has good sewage treatment effect and outstanding environmental protection effect, can realize the treatment effect of 1:1 (sewage: soil), has landscape function at the same time, and improves the plant environment of the sewage treatment plant; furthermore, the device also has the circulating purification capacity and can further improve the water quality.
Drawings
FIG. 1 is a schematic view of a sewage treatment apparatus in example 1 of the present invention;
FIG. 2 is a schematic view of a sewage treatment apparatus in example 2 of the present invention;
wherein: the system comprises a sedimentation tank 100, a water pump 110, an aeration tank 200, a first constructed wetland module 300, a second constructed wetland module 400, a third constructed wetland module 500, a water purification tank 600, a water quality inspection device 601, a circulating water pump 610, a baffle plate 700, a filter screen 710, a pebble layer 720, an active sludge layer 730, a raw soil layer 740, a first aquatic plant layer 750 and a second aquatic plant layer 760.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1
As shown in fig. 1, the constructed wetland-based modular sewage treatment plant comprises a sedimentation tank 100, a water pump 110, an aeration tank 200, a first constructed wetland module 300, a second constructed wetland module 400, a third constructed wetland module 500, a water purification tank 600, a baffle 700, a filter screen 710, a pebble layer 720, an active sludge layer 730, a raw soil layer 740, a first aquatic plant layer 750 and a second aquatic plant layer 760; the sedimentation tank 100 is a cylindrical container, the water pump 110 is arranged on the right side of the sedimentation tank 100, and the aeration tank 200 is arranged on the right side of the water pump 110; the pipeline of the water pump 110 is communicated with the top of the sedimentation tank 100 and the bottom of the aeration tank 200; the first artificial wetland module 300 is arranged at the right side of the aeration tank 200 and is separated by a baffle 700; the artificial wetland module 300 is a cylindrical open container, the opening height of the first artificial wetland module 300 is lower than that of the aeration tank 200, and the top of the first artificial wetland module 300 is provided with the filter screen 710; the pebble layer 720, the active sludge layer 730 and the raw soil layer 740 are sequentially paved at the bottom of the first artificial wetland module 300 upwards; the second constructed wetland module 400 is arranged at the right side of the first constructed wetland module 300, is lower than the first constructed wetland module 300 in height, and the second constructed wetland module 400 also comprises a pebble layer 720, an active sludge layer 730 and a raw soil layer 740; a layer 750 of aquatic plants is arranged on the original soil layer 740; the third constructed wetland module 500 is arranged at the right side of the second constructed wetland module 400; the artificial wetland module 400 is lower than the second artificial wetland module 400, and is also provided with a pebble layer 720, an active sludge layer 730 and a raw soil layer 740, wherein the aquatic plant second layer 760 is arranged on the raw soil layer 740; the clean water tank 600 is arranged at the right side of the third constructed wetland module 500 and is lower than the third constructed wetland module 500 in height;
the treatment mode of the modular sewage treatment device based on the artificial wetland comprises the following steps:
1, discharging urban domestic sewage into a sedimentation tank 100 through a pipeline, adding a precipitator, and precipitating for 48-96 hours;
2, pumping the water at the top of the sedimentation tank 100 into the bottom of the aeration tank 200 through a water pump 110, and carrying out blast aeration for the same time as the step 1;
3, after the aeration in the step 2 is finished, the water pump is started again, the water from the top of the aeration tank 200 flows into the first artificial wetland module 300, the second artificial wetland module 400 and the third artificial wetland module 500 in sequence, and the flow rate control is cooperated with the aeration step in the step 2, namely the flow rate can enable the water to fill the empty aeration tank 200 in the aeration time, so that the continuous sewage treatment can be carried out.
Example 2
As shown in fig. 2, the constructed wetland-based modular sewage treatment plant comprises a sedimentation tank 100, a water pump 110, an aeration tank 200, a first constructed wetland module 300, a second constructed wetland module 400, a third constructed wetland module 500, a clean water tank 600, a baffle 700, a filter screen 710, a pebble layer 720, an active sludge layer 730, a raw soil layer 740, a first aquatic plant layer 750 and a second aquatic plant layer 760; the sedimentation tank 100 is a cylindrical container, the water pump 110 is arranged on the right side of the sedimentation tank 100, and the aeration tank 200 is arranged on the right side of the water pump 110; the pipeline of the water pump 110 is communicated with the top of the sedimentation tank 100 and the bottom of the aeration tank 200; the first artificial wetland module 300 is arranged at the right side of the aeration tank 200 and is separated by a baffle 700; the artificial wetland module 300 is a cylindrical open container, the opening height of the first artificial wetland module 300 is lower than that of the aeration tank 200, and the top of the first artificial wetland module 300 is provided with the filter screen 710; the pebble layer 720, the active sludge layer 730 and the raw soil layer 740 are sequentially paved upwards at the bottom of the first artificial wetland module 300; the second constructed wetland module 400 is arranged at the right side of the first constructed wetland module 300, is lower than the first constructed wetland module 300 in height, and the second constructed wetland module 400 also comprises a pebble layer 720, an active sludge layer 730 and a raw soil layer 740; a layer 750 of aquatic plants is arranged on the original soil layer 740; the third constructed wetland module 500 is arranged at the right side of the second constructed wetland module 400; the second artificial wetland module 400 is lower in height, and is also provided with a pebble layer 720, an active sludge layer 730 and a raw soil layer 740, wherein the raw soil layer 740 is provided with a second layer 760 of aquatic plants; the clean water tank 600 is arranged at the right side of the third constructed wetland module 500 and is lower than the third constructed wetland module 500 in height; preferably, the filter screens 710 are arranged at the tops of the second constructed wetland module 400 and the third constructed wetland module 500; further, the meshes of the filter screens 710 on the tops of the first constructed wetland module 300, the second constructed wetland module 400 and the third constructed wetland module 500 are reduced in proportion; particularly, the mesh diameters of the filter screens 710 at the tops of the first constructed wetland module 300, the second constructed wetland module 400 and the third constructed wetland module 500 are 15mm, 10mm and 5mm in sequence; further, the aquatic plants are planted with cauliflower and golden fish algae in a layer 750; preferably, the second layer 760 of the aquatic plants is planted with potamogeton capillata and foxtail algae; specifically, the thicknesses of the pebble layer 720, the active sludge layer 730 and the original soil layer 740 are 50cm, 70cm and 120cm in sequence; further, the soil in the original soil layer 740 is sandy soil; preferably, a water quality testing device 601 is arranged in the clean water tank 600, a circulating water pump 610 is arranged behind the clean water tank 600, and the circulating water pump 610 is communicated with the bottom of the aeration tank 200 through a pipeline.
The treatment mode of the modular sewage treatment device based on the artificial wetland comprises the following steps:
1, discharging urban domestic sewage into a sedimentation tank 100 through a pipeline, adding a precipitator, and precipitating for 48-96 hours;
2, pumping the water at the top of the sedimentation tank 100 into the bottom of the aeration tank 200 through a water pump 110, and carrying out blast aeration for the same time as the step 1;
3, after the aeration in the step 2 is finished, the water pump is started again, the water from the top of the aeration tank 200 flows into the first artificial wetland module 300, the second artificial wetland module 400 and the third artificial wetland module 500 in sequence, and the flow rate control is cooperated with the aeration step in the step 2, namely the flow rate can enable the water to fill the empty aeration tank 200 in the aeration time, so that the continuous sewage treatment can be carried out.
The above are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and all the equivalent changes and modifications made by the claims and the summary of the invention should be covered by the protection scope of the present patent application.
Claims (10)
1. A modularized sewage treatment device based on an artificial wetland is characterized by comprising a sedimentation tank (100), a water pump (110), an aeration tank (200), a first artificial wetland module (300), a second artificial wetland module (400), a third artificial wetland module (500), a water purification tank (600), a baffle plate (700), a filter screen (710), a pebble layer (720), an active sludge layer (730), a raw soil layer (740), a first aquatic plant layer (750) and a second aquatic plant layer (760); the sedimentation tank (100) is a cylindrical container, the water pump (110) is arranged on the right side of the sedimentation tank (100), and the aeration tank (200) is arranged on the right side of the water pump (110); the pipeline of the water pump (110) is communicated with the top of the sedimentation tank (100) and the bottom of the aeration tank (200); the first artificial wetland module (300) is arranged on the right side of the aeration tank (200) and is separated by a baffle (700); the artificial wetland module (300) is a cylindrical open container, the opening height of the first artificial wetland module (300) is lower than that of the aeration tank (200), and the top of the first artificial wetland module (300) is provided with the filter screen (710); the pebble layer (720), the active sludge layer (730) and the raw soil layer (740) are sequentially paved upwards at the bottom of the first artificial wetland module (300); the second artificial wetland module (400) is arranged on the right side of the first artificial wetland module (300) and is lower than the first artificial wetland module (300), and the second artificial wetland module (400) is also provided with a pebble layer (720), an active sludge layer (730) and an original soil layer (740); a layer (750) of aquatic plants is arranged on the original soil layer (740); the third artificial wetland module (500) is arranged at the right side of the second artificial wetland module (400); the height of the artificial wetland module is lower than that of the second artificial wetland module (400), the artificial wetland module also comprises a pebble layer (720), an active sludge layer (730) and a raw soil layer (740), and the aquatic plant second layer (760) is arranged on the raw soil layer (740); the purified water tank (600) is arranged on the right side of the third artificial wetland module (500) and is lower than the third artificial wetland module (500).
2. The artificial wetland-based modular sewage treatment plant according to claim 1, wherein the filter screen (710) is arranged on the top of each of the second artificial wetland module (400) and the third artificial wetland module (500).
3. The artificial wetland based modular sewage treatment plant according to claim 2, wherein the meshes of the filter screens (710) on top of the first (300), second (400) and third (500) artificial wetland modules are scaled down.
4. The artificial wetland-based modular sewage treatment plant according to claim 2, wherein the mesh diameters of the filter screens (710) on the tops of the first artificial wetland module (300), the second artificial wetland module (400) and the third artificial wetland module (500) are 15mm, 10mm and 5mm in sequence.
5. The constructed wetland-based modular sewage treatment plant according to claim 1, wherein the aquatic plants are planted with cauliflower and hornworts in one layer (750).
6. The constructed wetland-based modular sewage treatment plant according to claim 1, wherein the aquatic plant second layer (760) is planted with potamogeton capillata and foxtail spicatum.
7. The artificial wetland-based modular sewage treatment plant according to claim 1, wherein the thicknesses of the pebble layer (720), the active sludge layer (730) and the raw soil layer (740) are 50cm, 70cm and 120cm in sequence.
8. The artificial wetland based modular sewage treatment plant according to claim 1, characterized in that the soil in the raw soil layer (740) is sandy soil.
9. The constructed wetland-based modular sewage treatment plant according to claim 1, wherein a water quality inspection device (601) is arranged in the clean water tank (600), a circulating water pump (610) is arranged behind the clean water tank (600), and the circulating water pump (610) is communicated with the bottom of the aeration tank (200) through a pipeline.
10. The treatment method of the artificial wetland-based modular sewage treatment plant according to any one of claims 1 to 9, comprising the steps of:
1) discharging the urban domestic sewage into a sedimentation tank (100) through a pipeline, adding a precipitator, and precipitating for 48-96 h;
2) pumping water at the top of the sedimentation tank (100) into the bottom of the aeration tank (200) through a water pump (110) to carry out blast aeration for the same time as the step (1);
3) and 2) after aeration is finished, starting the water pump again, enabling the water at the top of the aeration tank (200) to sequentially flow into the first constructed wetland module (300), the second constructed wetland module (400) and the third constructed wetland module (500), and controlling the flow rate to be cooperated with the aeration step of the step 2), namely enabling the water to fully fill the empty aeration tank (200) within the aeration time, so that continuous sewage treatment can be carried out.
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