CN113354088A - Device for treating rural domestic sewage tail water by forage grass type falling-dry artificial wetland - Google Patents
Device for treating rural domestic sewage tail water by forage grass type falling-dry artificial wetland Download PDFInfo
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- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02F3/105—Characterized by the chemical composition
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention discloses a forage grass type dry-type artificial wetland device for treating rural domestic sewage tail water, which comprises a biological treatment tail water unit, a front end water collecting tank, a peristaltic pump, a siphon water tank, a perforated water distribution pipe and a dry-type artificial wetland, wherein the dry-type artificial wetland comprises a fence, a wetland plant layer, a wetland matrix layer and a wetland water outlet pipe which are positioned in the fence; the water outlet of the biological treatment tail water unit is communicated with the water inlet of the front end water collecting tank, the peristaltic pump leads water in the front end water collecting tank into the siphon water tank through a pipeline, the water outlet of the siphon water tank is connected with the water inlet of the perforated water distribution pipe, the perforated water distribution pipe is positioned above the wetland matrix layer, the wetland plant layer is planted in the wetland matrix layer, the wetland water outlet pipe is positioned at the bottom of the wetland matrix layer, and the water outlet of the wetland water outlet pipe is positioned outside the enclosure. The device can solve the problems that the artificial wetland is easy to block, the reoxygenation capacity is weak, the plant nitrogen and phosphorus resource utilization effect is poor and the silage demand is large in the prior art.
Description
Technical Field
The invention relates to the technical field of rural domestic sewage tail water treatment, in particular to a forage grass type dry-falling artificial wetland device for treating rural domestic sewage tail water.
Background
With the rapid development of the national economic technology, the economic level of rural residents is remarkably improved, higher and higher requirements are put forward on the water environment, the artificial wetland is used as an important tail water treatment unit and is commonly used for treating domestic sewage treated by a biological section, pollutants are removed through matrix adsorption and microbial degradation, and meanwhile, nitrogen and phosphorus can be recycled through planting and harvesting of wetland plants.
With the long-term operation of a wetland system, the traditional wetland operation mode has more or less problems, such as that the surface flow artificial wetland overflows the surface of the wetland due to tail water, mosquitoes and flies are easy to breed in summer, the liquid surface is easy to freeze in winter, the reoxygenation capability is poor, the hydraulic load is low, the subsurface flow artificial wetland has a better reoxygenation effect compared with the surface flow artificial wetland, but the removal requirements of organic matters and ammonia nitrogen can not be well met, and therefore higher requirements are provided for the wetland configuration. And the aquatic plants are also important components of the artificial wetland, so that the nitrogen and phosphorus resource utilization of a wetland system can be effectively realized, and the substrate blockage is delayed. Traditional wetland plants such as aquatic vegetables, grasses and ornamental plants have certain economic value and resource utilization capability, but nitrogen and phosphorus resource utilization cannot be efficiently realized due to slow plant growth rate or small biomass, so that the screening of wetland plants with large biomass is very important.
Disclosure of Invention
The technical problem is as follows: the invention aims to solve the technical problems that the forage grass type dry-falling artificial wetland is used for treating rural domestic sewage tail water, so as to solve the problems that the artificial wetland in the prior art is easy to block, the reoxygenation capacity is weak, the resource utilization effect of plant nitrogen and phosphorus is poor, and the demand of silage is high,
the technical scheme is as follows: in order to solve the technical problem, the embodiment of the invention adopts a forage grass type dry-type artificial wetland treatment device for rural domestic sewage tail water, which comprises a biological treatment tail water unit, a front end water collecting tank, a peristaltic pump, a siphon water tank, a perforated water distribution pipe and a dry-type artificial wetland, wherein the dry-type artificial wetland comprises a fence, and a wetland plant layer, a wetland matrix layer and a wetland water outlet pipe which are positioned in the fence; the water outlet of the biological treatment tail water unit is communicated with the water inlet of the front end water collecting tank, the peristaltic pump leads water in the front end water collecting tank into the siphon water tank through a pipeline, the water outlet of the siphon water tank is connected with the water inlet of the perforated water distribution pipe, the perforated water distribution pipe is positioned above the wetland matrix layer, the wetland plant layer is planted in the wetland matrix layer, the wetland water outlet pipe is positioned at the bottom of the wetland matrix layer, and the water outlet of the wetland water outlet pipe is positioned outside the enclosure.
Preferably, the wetland substrate layer comprises a river sand layer, a zeolite layer and a ceramsite layer which are sequentially arranged from top to bottom.
Preferably, the river sand particle size in the river sand layer is 0.3-1 mm, the zeolite particle size in the zeolite layer is 3-7 mm, and the ceramsite particle size in the ceramsite layer is 10-20 mm.
Preferably, the filling thickness ratio of the river sand layer, the zeolite layer and the ceramic particle layer is 1: 3: 1.
Preferably, the device for treating rural domestic sewage tail water by the forage grass type falling dry type artificial wetland further comprises a vent pipe, wherein the vent pipe is uniformly and vertically arranged on the wetland matrix layer and made of pvc (polyvinyl chloride), four structural through holes which are symmetrically arranged in a cross shape and have the aperture of 5mm are arranged on the vent pipe every 10cm, and the height of the vent pipe is the same as the depth of the wetland matrix layer.
Preferably, forage grass plants are planted in the wetland plant layer.
Preferably, the forage grass plant is one or more of Juncao, pennisetum hydridum or pennisetum purpureum, and the overall planting density is 18-22 plants/m2。
Preferably, the forage plants are harvested at a height of more than 1.2m, and are harvested at a distance of 10cm from the ground.
Preferably, the siphon water tank carries out sequencing batch water distribution, and the time of a single siphon period is 2 hours.
Preferably, the perforated water distribution pipe is made of pvc material, and water outlet holes with the aperture of 1mm are formed in the bottom of the perforated water distribution pipe at intervals of 10 cm.
Has the advantages that: compared with the prior art, the invention has the following advantages and beneficial effects: according to the device for treating rural domestic sewage tail water by the forage grass type drop-dry type artificial wetland, water is uniformly distributed through spraying, plant growth is promoted, the grain size of a substrate is graded from fine to coarse from top to bottom, the hydraulic retention time of a drop-dry area is effectively prolonged, river sand is filled to have strong adsorption capacity on phosphorus, removal of the phosphorus can be enhanced, a full drop-dry operation mode is adopted, namely, the arrangement without submerging depth is adopted, the reoxygenation capacity of a system can be effectively enhanced, ammonia nitrogen is enhanced, forage grass plants are harvested periodically, and nitrogen and phosphorus in the tail water are effectively recycled. The system has the advantages of flexible operation mode, easy maintenance and low treatment cost, and is suitable for tail water quality purification.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a top view of a wetland substrate layer and aeration pipes in an embodiment of the invention.
Wherein: the biological treatment system comprises a biological treatment tail water unit 1, a front end water collecting tank 2, a peristaltic pump 3, a siphon water tank 4, a wetland plant layer 5, a perforated water distribution pipe 6, a river sand layer 7, a zeolite layer 8, a ceramsite layer 9, a wetland water outlet pipe 10 and a ventilation pipe 11.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail below with reference to the accompanying drawings in conjunction with specific embodiments.
As shown in fig. 1, the device for treating rural domestic sewage tail water by using the forage grass type dry-type artificial wetland of the embodiment comprises a biological treatment tail water unit 1, a front end water collecting tank 2, a peristaltic pump 3, a siphon water tank 4, a perforated water distribution pipe 6 and the dry-type artificial wetland. The dry-type artificial wetland comprises an enclosure, and a wetland plant layer 5, a wetland matrix layer and a wetland water outlet pipe 10 which are positioned in the enclosure. The water outlet of the biological treatment tail water unit 1 is communicated with the water inlet of the front end water collecting tank 2, the peristaltic pump 3 leads water in the front end water collecting tank 2 into the siphon water tank 4 through a pipeline, the water outlet of the siphon water tank 4 is connected with the water inlet of the perforated water distribution pipe 6, the perforated water distribution pipe 6 is positioned above the wetland matrix layer, the wetland plant layer 5 is planted in the wetland matrix layer, the wetland water outlet pipe 10 is positioned at the bottom of the wetland matrix layer, and the water outlet of the wetland water outlet pipe 10 is positioned outside the enclosure. The water distribution of the perforated water distribution pipe 6 can effectively realize uniform water distribution.
In the above embodiment, the wetland water outlet pipe 10 is located at the bottom end of the dry wetland, so as to ensure that the wetland system has no submerging depth.
The method for removing nitrogen and phosphorus from sewage comprises the following steps: tail water enters a front end water collecting tank 2 to homogenize water quality and water quantity, the tail water is lifted to a siphon water tank 4 through a peristaltic pump 3, when the water level reaches a certain height, the wetland carries out siphon water outlet, sewage flows through a perforated water distribution pipe 6 and is uniformly distributed to a wetland system, the sewage enters the wetland system from the surface of a substrate, nitrogen and phosphorus are removed under the combined action of wetland plant absorption, root system interception, wetland substrate layer adsorption and microbial degradation, and then the sewage is discharged out of the system and flows out of the wetland system, a wetland water outlet pipe 10 is positioned at the bottom end of the wetland, the system is ensured to be in a full-dry operation mode, and the purpose of tail water quality purification is achieved.
The falling-dry type artificial wetland of the embodiment adopts a falling-dry operation mode, namely sewage falls from the surface of the substrate to the bottom end of the wetland, the system is not provided with a submerging water level, and oxygen in the atmosphere can be sucked into the substrate of the wetland due to the falling of the sewage, so that the oxygen transmission capacity of the wetland system is improved, the reoxygenation effect is enhanced, and the removal of ammonia nitrogen and organic matters is facilitated. The falling-dry type artificial wetland adopts a spraying and idle combined operation mode, namely an aerobic-anoxic cyclic alternative environment in time is formed, the anoxic condition is strengthened under the condition of ensuring sufficient reoxygenation of the system, the denitrification capability of the system is improved, and the quality of the effluent water is ensured. In the embodiment, the wetland has the advantages of low manufacturing cost, low operation cost, easy maintenance, good additional benefit and treatment effect, and is suitable for treating tail water in rural domestic sewage.
Preferably, the wetland substrate layer comprises a river sand layer 7, a zeolite layer 8 and a ceramsite layer 9 which are sequentially arranged from top to bottom. The wetland matrix layer adopts a grading mode of fine top and coarse bottom, so that the flow state can be better improved, the contact time of tail water and the matrix is prolonged, and the purification effect of the system is enhanced.
Preferably, the river sand in the river sand layer 7 has a particle size of 0.3-1 mm, the zeolite in the zeolite layer 8 has a particle size of 3-7 mm, and the ceramsite in the ceramsite layer 9 has a particle size of 10-20 mm. The filling thickness ratio of the river sand layer 7, the zeolite layer 8 and the ceramsite layer 9 is 1: 3: 1. The river sand on the uppermost layer has the characteristic of small particle size, is a good medium for adsorbing phosphorus, and can promote the wetland system to distribute water uniformly. River sand has good adsorption effect on phosphorus and has large adsorption saturation amount. The zeolite has a porous structure, is beneficial to the attachment growth of microorganisms, can quickly form biological zeolite, is beneficial to the degradation of ammonia nitrogen in water, and promotes the conversion of ammonia nitrogen. The porous structure of the zeolite is beneficial to the growth of plant roots and the attachment of microorganisms, and can improve the conversion efficiency of ammonia nitrogen. The ceramsite at the lowest layer is an inert filler with a porous structure, microorganisms are easy to attach, and the ceramsite with large particle size can play a supporting role, so that the stability of a system is ensured.
The filling of the wetland matrix layer adopts three layers of matrix for layered filling, the filling mode of fine top and coarse bottom can improve the flow state of the sewage, the proportion of the river sand, the zeolite and the ceramsite can prolong the retention time of the sewage in the wetland, and the nitrogen and phosphorus removal effect of the system is enhanced.
As shown in fig. 2, the forage grass type dry artificial wetland device for treating rural domestic sewage tail water further comprises an air pipe 11, wherein the air pipe 11 is uniformly and vertically arranged on a wetland substrate layer, the inner diameter is 100mm, the air pipe 11 is made of pvc material, four structural through holes which are symmetrically arranged in a cross shape and have the aperture of 5mm are arranged on the air pipe 11 every 10cm, and the height of the air pipe 11 is the same as the depth of the wetland substrate layer. The placement density of the vent pipes is that one vent pipe is placed every 2m in the length direction and the width direction, and the length of the vent pipe is consistent with the filling depth of the matrix. When the substrate is filled in the tank body, the vent pipe 11 is provided with structural through holes, so that the natural reoxygenation of the wetland system can be effectively promoted, and the nitrification is enhanced. The vent pipe 11 is provided with structural through holes, which is favorable for realizing good gas exchange with the atmospheric environment at different filling depths of the dry land and the wet land, and ensures the aerobic environment of a wetland system, thereby strengthening the nitrification of nitrobacteria.
Preferably, forage grass plants are planted in the wetland plant layer 5. The forage grass plant is one or more of Juncao, pennisetum hydridum or pennisetum purpureum, and the overall planting density is 18-22 plants/m2. Preferably, the forage plants are harvested at a height of more than 1.2m, and are harvested at a distance of 10cm from the ground. The forage grass plant is a plant with stems and leaves which can be used for feeding herbivores or making silage, has the advantages of multiple cutting, high yield and large biomass, and can bring good additional economic value while realizing the recycling of nitrogen and phosphorus in tail water along with the proposal of a policy of changing grains into feeds and the promotion of test point work of a planting and breeding combination mode, and the developed root system can also effectively relieve the problem of substrate blockage and prolong the service life of the wetland. The whole wetland system has the advantages of low operation cost, easy maintenance and remarkable additional economic benefit, realizes the double combination of the wetland environmental benefit and the economic cost benefit, and the effluent quality reaches the first-level B discharge standard of pollutant discharge Standard of urban wastewater treatment plant (GB18918 plus 2002). When the height of the forage grass plant exceeds 120cm, the forage grass plant is harvested at a place 10cm close to the ground, resource utilization of nitrogen and phosphorus is effectively realized, a greenhouse is built in winter to keep warm, and the quality of effluent water and smooth overwintering of the plant are guaranteed.
Preferably, the siphon water tank 2 performs sequencing batch water distribution, and the time of a single siphon period is 2 hours.
Preferably, the perforated water distribution pipe 6 is made of pvc material, and water outlet holes with the aperture of 1mm are arranged at the bottom of the perforated water distribution pipe 6 at intervals of 10 cm. The water outlet holes are distributed downwards in bilateral symmetry and form an included angle of 45 degrees with the vertical direction. The perforated water distribution pipe 6 is arranged on the surface of the substrate to ensure the uniform water distribution of the system.
The forage grass type dry-falling artificial wetland device for treating rural domestic sewage tail water adopts an operation mode that sewage falls from top to bottom and is discharged, and the device has no submerged water depth. Compared with an undercurrent artificial wetland, the device has better reoxygenation capability, is beneficial to removing organic matters and ammonia nitrogen, and has larger hydraulic load, namely, the wetland in unit area can treat more sewage in unit time.
The device of the embodiment forms a wetland environment with 'aerobic-anoxic' alternative circulation in time by the installation of the vent pipe and the control of the water inlet mode, and can strengthen the nitrogen and phosphorus removal of the system. The planting of the large-biomass forage grass plants absorbs nitrogen and phosphorus in the sewage for the plants to grow and reproduce, and can realize the resource utilization of nitrogen and phosphorus. The developed root system of the forage grass plant can intercept organic matters and suspended particles in the sewage, prevent the sewage from blocking when flowing through the dry wetland, and can provide more attachment spaces for the growth of microorganisms along with the continuous growth of the root system of the plant, thereby further strengthening the removal of pollutants. The forage grass that regularly reaps can be used as the raw materials of silage, has good additional economic benefits, easily promotes in rural area, and the intermittent type mode of intaking is realized through siphon water tank, can effectively avoid the damage that the mechanical switch water pump caused.
According to the invention, the front end water collecting tank 2 collects tail water, the siphon water tank 4 controls intermittent water inlet, the perforated water distribution pipe 6 distributes water uniformly, the aquatic plants absorb nitrogen and phosphorus, the matrix grading improves the flow state, and the removal effect of the system on pollutants is improved. Wherein, the front end collecting tank 2 achieves the purpose of water quality and water quantity equalization, tail water treated by the biological unit flows into the front end collecting tank 2, the influence of water quantity and concentration change on a wetland system is reduced, and the effective volume is designed to be the volume corresponding to the hydraulic retention time of the local daily average water quantity of 8 h. The wetland water outlet pipe 10 is positioned below the wet ground, the system is not provided with submerging depth, and the sewage intermittently entering the wetland system is completely discharged out of the system in a self-flowing manner, so that the reaeration effect of the wetland is ensured. The siphon water tank 4 controls intermittent water inflow through setting of siphon water level, and the ratio of the volume of the siphon water tank to the unit area of water distribution service is defined as water distribution load. The water distribution load in the forage grass type dry wetland is 12.5L/(m)2H), the water distribution period is 2h, and the hydraulic load of the wetland per unit area is 0.3m3/(m2·d)。
The dry-type artificial wetland of the embodiment adopts an operation mode of intermittent spraying water inflow, and the hydraulic load is 0.3m3/(m2D), the spraying period is 2h,the intermittent spraying can form an 'aerobic-anoxic' alternative environment, effectively improve the reoxygenation effect and the denitrification capability of the system, and simultaneously install the vent pipe when filling the matrix to strengthen the reoxygenation effect.
The invention adopts the large-biomass falling-type constructed wetland, effectively overcomes the defect of weak reoxygenation capability in the traditional wetland, simultaneously introduces the forage grass plants with large biomass into the constructed wetland, and has the characteristics of high growth speed and high tolerance, so the forage grass plants grow well in the wetland, the resource utilization efficiency of nitrogen and phosphorus is effectively improved, the developed root system can improve the flow state, the effluent water quality is improved, the substrate blockage is delayed, the later maintenance is easy, the harvested forage grass can be used for preparing silage, the invention has good economic additional benefit, and simultaneously can effectively mobilize the enthusiasm of villagers, thereby realizing the win-win of environmental benefit and economic benefit.
The forage grass plants planted in the wetland all belong to forage grass plants with developed root systems and large biomass, have good absorption effect on nitrogen and phosphorus in tail water, can realize resource utilization of nitrogen and phosphorus on the basis of ensuring system nitrogen and phosphorus removal, and the developed root systems optimize the flow state of the wetland system, prolong the retention time of sewage in the system, intercept suspended matters in the sewage and slow down water outlet blockage. Forage plants, for example: one or more of the grass, pennisetum hydridum and the pennisetum purpureum which have developed root systems can intercept organic matters and suspended matters in the sewage and prevent the sewage from blocking the dry and wet land, and the developed root systems can prolong the flow of the sewage in the dry and wet land and prolong the retention time, and the overall planting density of the forage grass plants is 18-22 plants/m2. The large-biomass plants in the wetland are planted into perennial Juncao, pennisetum hydridum and pennisetum purpureum which are all forage grasses, and the wetland has the characteristics of large biomass, good tolerance and high growth rate, and has a large demand on nitrogen fertilizers and phosphorus fertilizers in the growth process and a good absorption effect on nitrogen and phosphorus in water. In comparison, Juncao is suitable for repairing high PO4 3-P concentration, any NH4 +Sewage of N concentration but NO3 -The N absorption effect is general; sweet grassiness for repairing low PO4 3--P concentration, high NO3 -Sewage of N concentration, but for NH4 +The absorption effect of N is general; the pennisetum hydridum is suitable for low NO3 -Sewage of N concentration, but for PO4 3--P and NH4 +The absorption effect of-N was not significant. Meanwhile, the forage grass plants have developed root systems, so that more space can be provided for the attached growth of microorganisms, the oxygen secretion of the root systems is favorable for the degradation of pollutants, the developed root systems of the forage grass can improve the flow state of the wetland, the nitrogen removal effect of the wetland is improved by more than 10% by planting the forage grass plants compared with that of a pure matrix wetland, and suspended substances in sewage can be intercepted by the growth of the root systems to delay blockage. Meanwhile, the forage grass is perennial plant and has the characteristic of tillering growth, when the ground height of the plant is higher than 120cm, the plant is harvested by a sickle, the plant is harvested at a height of 10cm away from the ground, the harvested plant can tillering growth, the forage grass has good plant activity and growth rate, the harvested forage grass can be used for preparing silage, good economic additional benefits are brought while resource utilization of nitrogen and phosphorus is achieved, the enthusiasm of villagers can be effectively adjusted, and the treatment cost is reduced.
Experiments prove that under the condition that the average concentration of COD, ammonia nitrogen, total nitrogen and total phosphorus in inlet water is 72.87, 9.38, 26.17 and 2.02mg/L, the average removal rate of the large-biomass dry-type artificial wetland to COD, ammonia nitrogen, total nitrogen and total phosphorus respectively reaches 61.98%, 89.63%, 32.30% and 61.08%, the ammonia nitrogen and COD in outlet water except individual points all reach the first-level A standard of pollutant discharge standard of urban sewage treatment plants (GB18918-2002), and the total nitrogen and the total phosphorus all reach the first-level B standard of pollutant discharge standard of urban sewage treatment plants (GB 18918-2002).
The above embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments, and those skilled in the art can make modifications, enhancements, improvements, and changes within the scope and spirit of the present invention.
Claims (10)
1. A forage grass type falls dry-type constructed wetland and handles rural domestic sewage tail water's device which characterized in that: the device comprises a biological treatment tail water unit (1), a front end water collecting tank (2), a peristaltic pump (3), a siphon water tank (4), a perforated water distribution pipe (6) and a dry-type artificial wetland, wherein the dry-type artificial wetland comprises an enclosure, a wetland plant layer (5), a wetland matrix layer and a wetland water outlet pipe (10) which are positioned in the enclosure;
the water outlet of the biological treatment tail water unit (1) is communicated with the water inlet of the front end water collecting tank (2), water in the front end water collecting tank (2) is introduced into the siphon water tank (4) through the pipeline by the peristaltic pump (3), the water outlet of the siphon water tank (4) is connected with the water inlet of the perforated water distribution pipe (6), the perforated water distribution pipe (6) is located above the wetland matrix layer, the wetland plant layer (5) is planted in the wetland matrix layer, the wetland water outlet pipe (10) is located at the bottom of the wetland matrix layer, and the water outlet of the wetland water outlet pipe (10) is located outside the enclosure.
2. The device for treating rural domestic sewage tail water by the forage grass type dry-falling artificial wetland according to claim 1, wherein the wetland matrix layer comprises a river sand layer (7), a zeolite layer (8) and a ceramsite layer (9) which are sequentially arranged from top to bottom.
3. The device for treating rural domestic sewage tail water by the forage grass type drop-dry artificial wetland according to claim 2, characterized in that the river sand in the river sand layer (7) has a particle size of 0.3-1 mm, the zeolite in the zeolite layer (8) has a particle size of 3-7 mm, and the ceramsite in the ceramsite layer (9) has a particle size of 10-20 mm.
4. The device for treating rural domestic sewage tail water in the forage grass type drop-dry artificial wetland according to claim 2, wherein the filling thickness ratio of the river sand layer (7), the zeolite layer (8) and the ceramsite layer (9) is 1: 3: 1.
5. The device for treating rural domestic sewage tail water by the forage grass type dry-falling artificial wetland according to claim 2, characterized by further comprising an air pipe (11), wherein the air pipe (11) is uniformly and vertically arranged on the wetland substrate layer, the air pipe (11) is made of pvc (polyvinyl chloride), four structural through holes which are symmetrically arranged in a cross shape and have the aperture of 5mm are arranged on the air pipe (11) every 10cm, and the height of the air pipe (11) is the same as the depth of the wetland substrate layer.
6. The apparatus for treating rural domestic sewage tail water by the forage grass type dry-falling artificial wetland according to claim 1, characterized in that forage grass plants are planted in the wetland plant layer (5).
7. The device for treating rural domestic sewage tail water by the forage grass type dry-falling artificial wetland according to claim 6, wherein the forage grass plant is one or more of Juncao, pennisetum hydridum or sweet grassiness, and the overall planting density is 18-22 plants/m2。
8. The apparatus for treating rural domestic sewage tail water in a forage grass type dry artificial wetland according to claim 6, wherein the forage grass plants are harvested at a position 10cm close to the ground when the height of the forage grass plants exceeds 1.2 m.
9. The forage type dry-type artificial wetland treatment device for rural domestic sewage tail water according to claim 1, characterized in that the siphon water tank (2) performs sequencing batch water distribution, and the length of a single siphon period is 2 hours.
10. The device for treating rural domestic sewage tail water by the forage grass type drop-dry artificial wetland according to claim 1, characterized in that the perforated water distribution pipe (6) is made of pvc (polyvinyl chloride), and water outlet holes with the aperture of 1mm are arranged at the bottom of the perforated water distribution pipe (6) at intervals of 10 cm.
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| CN202110479150.5A CN113354088A (en) | 2021-04-30 | 2021-04-30 | Device for treating rural domestic sewage tail water by forage grass type falling-dry artificial wetland |
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| CN202110479150.5A CN113354088A (en) | 2021-04-30 | 2021-04-30 | Device for treating rural domestic sewage tail water by forage grass type falling-dry artificial wetland |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804522A (en) * | 2022-04-25 | 2022-07-29 | 东南大学 | Ash water treatment system and method for falling dry type artificial wetland in ash-black separation mode |
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