CN212640230U - Water storage overflow filtering device for courtyard type domestic sewage purifying tank - Google Patents
Water storage overflow filtering device for courtyard type domestic sewage purifying tank Download PDFInfo
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- CN212640230U CN212640230U CN202021296759.6U CN202021296759U CN212640230U CN 212640230 U CN212640230 U CN 212640230U CN 202021296759 U CN202021296759 U CN 202021296759U CN 212640230 U CN212640230 U CN 212640230U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 231
- 238000003860 storage Methods 0.000 title claims abstract description 107
- 238000001914 filtration Methods 0.000 title claims abstract description 43
- 239000010865 sewage Substances 0.000 title claims abstract description 33
- 239000004576 sand Substances 0.000 claims description 18
- 239000002689 soil Substances 0.000 claims description 18
- 238000000746 purification Methods 0.000 claims description 16
- 238000005086 pumping Methods 0.000 claims description 14
- 239000011152 fibreglass Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 241000196324 Embryophyta Species 0.000 abstract description 14
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 238000011010 flushing procedure Methods 0.000 abstract description 3
- 239000003673 groundwater Substances 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000003973 irrigation Methods 0.000 description 4
- 230000002262 irrigation Effects 0.000 description 4
- 239000003651 drinking water Substances 0.000 description 3
- 235000020188 drinking water Nutrition 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 235000013311 vegetables Nutrition 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000003621 irrigation water Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The utility model relates to a courtyard formula domestic sewage purifies groove water storage and overflows and strain device follows the requirement that ecological environment department "rural domestic sewage is collected on the spot, is handled on the spot, is absorbed on the spot", sets up at the terminal device of sewage treatment device, has general popularization meaning in the rural area in china in the north, and it includes: a telescopic water storage filtering tank for burying below ground level, the inner chamber of water storage filtering tank includes: the water storage cavity and the overflow filter cavity are positioned outside the water storage cavity, the upper part of the water storage cavity is provided with a water inlet, the bottom of the water storage cavity is communicated with the overflow filter cavity, and the upper part of the overflow filter cavity is provided with an overflow hole; the filter medium is filled and arranged inside the overflow filter cavity. The water storage overflow filtering device can ensure that a certain amount of water in the water storage cavity is reused for flushing a toilet or irrigating, and can also realize on-site overflow, seepage and absorption of redundant parts and plant root system absorption.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection engineering technique and specifically relates to a courtyard formula domestic sewage purifies groove water storage and overflows and strain device is related to.
Background
The courtyard type domestic sewage purification tank can treat sewage in units of sewage (such as water for bathing, flushing toilets, washing clothes and kitchens) in rural scattered households, scattered residential areas and the like so as to remove suspended matters, hydrocarbons, ammonia, nitrogen, phosphorus and bacteria in the sewage. The process flow is 'sewage regulating tank-anaerobic tank-aerobic tank-clean water tank', wherein an internal reflux device is arranged between the anaerobic tank and the aerobic tank, so that the purposes of nitrification and denitrification can be achieved, the clean water tank can filter and disinfect sewage to obtain harmless clean water, and finally the obtained clean water flows out from an outlet of a sewage purifying tank, so that a user can conveniently flush a toilet or irrigate flowers and grass in courtyard and vegetable garden and courtyard.
However, the excess water flowing out of the current sewage purification tank can only be discharged outside after the irrigation of garden gardens and garden flowers and plants is finished, when the sewage amount processed by the sewage purification tank is large, the obtained clean water is correspondingly increased, the water consumption for garden irrigation is limited, and the discharged water affects the environment and wastes resources in rural areas without a drainage system; particularly, irrigation water in rural areas in the north is reduced, and the outer drainage easily causes the road surface of a street and a road where the street and the road are located to be frozen, so that the potential slip hazard is formed when the old and children walk.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a courtyard formula domestic sewage purification groove water storage overflow filter device that can guarantee a quantitative normal water and store the retrieval and utilization, can realize again that unnecessary part consumes on the spot, avoids outer row harm.
In order to solve the above problems, the utility model adopts the following technical proposal:
courtyard formula domestic sewage purifies groove water storage and overflows and strain device, it includes:
a sleeve-type water-storage overflow canister for being buried below ground level, the inner cavity of the water-storage overflow canister comprising: the water storage cavity and the overflow filter cavity are positioned outside the water storage cavity, the upper part of the water storage cavity is provided with a water inlet, the bottom of the water storage cavity is communicated with the overflow filter cavity, and the upper part of the overflow filter cavity is provided with an overflow hole;
the filter medium is filled and arranged inside the overflow filter cavity.
As a further improvement, the filter medium comprises a gravel layer and a sand layer from bottom to top in proper order, the sand layer top is provided with the soil layer that is used for planting water-fast plants, and the water in the water storage cavity flows to the filter medium behind the soil layer, so the soil layer forms water-fast plant wetland.
As a further improvement of the utility model, the overflow hole is positioned at the junction of the sand layer and the soil layer.
As a further improvement of the utility model, the water inlet is positioned above the overflow hole.
As a further improvement of the utility model, the bottom of the water storage cavity is communicated with the overflow filter cavity through a water distribution pipe.
As a further improvement of the utility model, the water distribution pipe is provided with a plurality of water distribution pipes, a plurality of water distribution pipes are followed the circle evenly distributed extremely in the water storage chamber overflow filter chamber.
As a further improvement of the present invention, one end of the water distribution pipe is located in the water storage cavity, and the other end of the water distribution pipe is located in the overflow filter cavity, which is provided with a plurality of water distribution holes on the outer wall of the water distribution pipe, the water distribution holes are used for supplying water in the water storage cavity to overflow into the bottom of the filter medium.
As a further improvement of the utility model, the top in water storage chamber is provided with the top cap, be provided with the pumping hole that is used for supplying the drinking-water pipe to pass on the top cap.
As a further improvement, the inside in water storage chamber is provided with miniature immersible pump, miniature immersible pump with the drinking-water piping connection, miniature immersible pump is used for when opening, makes the water of water storage intracavity portion via the drinking-water piping suction is used for towards the lavatory or irrigates to the ground top.
As a further improvement of the utility model, the water storage overflow filtering tank is made of glass fiber reinforced plastic.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the water storage overflowing and filtering device provided by the embodiment of the utility model can store clear water by arranging the water storage cavity, so that a user can take water from the water storage cavity when needing to irrigate courtyard vegetable garden and courtyard flowers and plants, and can continuously store the clear water in the water storage cavity when not needing to use, thereby avoiding discharging redundant clear water outside, not influencing the environment, avoiding resource waste, and simultaneously avoiding the phenomenon of freezing the road surface of the street and the same road surface caused by the discharged water in winter; in addition, through setting up the overflow filter chamber in the horizon below, guaranteed that the overflow hole also is located the horizon below, when the water yield of water storage intracavity was too much, thereby unnecessary water can supplement shallow groundwater via the overflow hole outflow, thereby the overflow water realizes deep purification through two-stage medium filtration and plant roots absorption nitrogen phosphorus element, has guaranteed more that the quality of water of supplementing shallow groundwater is up to standard.
And the water storage overflow filtering tank is designed into a sleeve structure, so that the water storage cavity is arranged inside, the overflow filtering cavity is arranged outside, a gravel layer, a sand layer and a soil layer are sequentially arranged in the overflow filtering cavity from bottom to top, and the water storage cavity and the overflow filtering cavity are arranged on one bottom surface. The drain pipe is arranged through the opening at the bottom of the water storage cavity, the drain pipe is positioned in the overflow filter cavity, a plurality of water distribution holes are formed in the outer wall of each water distribution pipe, clear water in the water storage cavity can automatically flow into the overflow filter cavity from bottom to top by means of the pressure of the water, the clear water passes through a gravel layer and a sand layer and is filtered secondarily, the water level reaches the position of an overflow hole (the position where the sand layer is bordered by a soil layer), the water surface keeps a certain height, part of the water is absorbed by the root system of a plant on the upper portion of a filter medium, and the water of the surplus part overflows out of the. By the operation, a certain amount of reclaimed water can be stored and recycled, and the on-site consumption of the redundant part can be realized, so that the harm of discharge is avoided; and the user can also make the water in the water storage cavity be pumped to the ground through the pumping pipe by opening the miniature submersible pump so as to be used.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a water storage overflow and filtration device of a courtyard-type domestic sewage purification tank provided by the embodiment of the utility model.
Fig. 2 is an enlarged view at a in fig. 1.
Fig. 3 is a top view of the bottom of fig. 1.
Wherein: 1-water storage overflow filtering tank, 11-water storage cavity, 12-overflow filtering cavity, 13-water inlet, 14-overflow hole, 15-top cover, 16-wetland, 2-filtering medium, 21-gravel layer, 22-sand layer, 3-soil layer, 4-water distribution pipe, 41-water distribution hole, 5-water pumping pipe and 6-micro submersible pump.
Detailed Description
To make the objects, aspects and advantages of the present invention clearer and more fully described below with reference to the following detailed description, it is to be understood that the terms "center", "vertical", "horizontal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations and positional relationships based on the drawings, and are used merely for convenience of describing and simplifying the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
FIG. 1 is a schematic view showing the structure of a water storage overflow filtering device of a courtyard-type domestic sewage purification tank according to the embodiment of the present invention, which complies with the requirements of "rural domestic sewage collection, treatment and consumption in situ" of the department of ecological environment, and is a device arranged at the end of sewage treatment equipment, and has a general popularization meaning in rural areas in the northern part of China, as shown in FIG. 1, the water storage overflow filtering device comprises a sleeve-type water storage overflow filtering tank 1 buried under the ground level, and the material of the water storage overflow filtering tank 1 is glass fiber reinforced plastic.
The inner cavity of the water storage overflow filtering tank 1 comprises: the water storage cavity 11 and the overflow filter cavity 12 are positioned outside the water storage cavity 11, the upper part of the water storage cavity 11 is provided with a water inlet 13, the bottom of the water storage cavity 11 is communicated with the overflow filter cavity 12, and the upper part of the overflow filter cavity 12 is provided with an overflow hole 14;
and the filter medium 2 is filled and arranged inside the overflow filter cavity 12.
Inside water storage chamber 11 can be entered into by water inlet 13 to the clear water that flows out after sewage purification groove handles, and enter into excessive filter chamber 12 by the bottom in water storage chamber 11, along with the water in the water storage chamber 11 increases gradually, the water that gets into inside excessive filter chamber 12 also can increase thereupon, make the upper plane of the clear water in the water storage chamber 11 and the clear water upper plane parallel and level (the communicating vessel principle) in the excessive filter chamber 12, after the upper plane of the inside clear water in water storage chamber 11 flushes with the position that sets up of overflow hole 14, along with the clear water continues to enter into in the water storage chamber 11, unnecessary clear water can flow out via overflow hole 14.
The embodiment of the utility model provides a water storage overflow filtering device through being provided with water storage chamber 11, can store the clear water, and the user can get the water from water storage chamber 11 when need irrigate courtyard vegetable garden, courtyard flowers and plants, and when need not use, can continue to store the clear water in water storage chamber 11, therefore does not need the unnecessary clear water of outer row of arranging, can not influence the environment, has avoided the wasting of resources, has avoided the phenomenon of street, the same road surface icing that causes because of outer drainage in winter simultaneously; in addition, the overflow filtering cavity 12 is arranged below the ground level, so that the overflow hole 14 is also positioned below the ground level, when the water amount in the water storage cavity 11 is too much, redundant water can flow out through the overflow hole 14 to supplement shallow groundwater, the reclaimed water is deeply purified, and the water quality of the supplemented shallow groundwater is ensured to reach the standard.
Wherein, filter medium 2 includes grit layer 21 and sand bed 22 from bottom to top in proper order, and sand bed 22 top is provided with the soil layer 3 that is used for planting the vegetation, and overflow hole 14 is located the soil layer 22 and 3 of soil layer's department of connecing. The last plane of inside clear water of water storage chamber 11 flushes the back with the position that sets up of overflow hole 14, along with the clear water continues to enter into water storage chamber 11 in, the last plane of clear water also can rise gradually in the excessive canister, make soil layer 3 become water-fast plant wetland 16 (courtyard small flower bed), the plant on this wetland 16 is through root absorption moisture and grow, the root of some plants can reach in the sand bed, promptly, reach the below of overflow hole 14, guaranteed that the plant can be through elements such as nitrogen phosphorus of root system absorption mesoaquatic at the in-process of growing, improve outer drainage quality of water, can also increase the courtyard view, beautify the courtyard environment.
Therefore, the overflow water flowing out of the overflow hole 14 is subjected to two-stage medium filtration and nitrogen and phosphorus element absorption by the plant root system to realize deep purification, and the water quality of the supplemented shallow groundwater is further ensured to reach the standard.
The embodiment of the present invention does not specifically limit the relative positions of the water inlet 13 and the overflow hole 14, and exemplarily, as shown in fig. 1, the water inlet 13 is located above the overflow hole 14.
Regarding the way of communicating the water storage chamber 11 with the overflow chamber, in a possible implementation, the bottom of the water storage chamber 11 is communicated with the overflow filter chamber 12 through the water distribution pipe 4, wherein one end of the water distribution pipe 4 can be arranged in the water storage chamber 11 and the other end can be arranged in the overflow filter chamber 12.
Wherein, one end of the water distribution pipe 4 can not be propped against the inner wall of the overflow filter cavity 12, so that clean water flows into the overflow cavity through the other end of the water distribution pipe 4; or, the other end of the water distribution pipe 4 abuts against the inner wall of the overflow filter chamber 12, the outer wall of the water distribution pipe 4 in the overflow filter chamber 12 is provided with a plurality of water distribution holes 41, clean water overflows into the overflow filter chamber 12 through the plurality of water distribution holes 41, and the clean water gradually moves upwards from the bottom of the filter medium 2.
The embodiment of the utility model provides a do not do specifically and restrict to quantity, setting position and size of water distributor 4, exemplarily, as shown in fig. 3, this water distributor 4 can set up a plurality of roots (like 3 or 4), and a plurality of water distributor 4 along 11 week circles evenly distributed of water storage chamber to overflowing in straining chamber 12, the internal diameter of water distributor 4 can be 50 mm.
Further, in order to facilitate the user to use the water stored in the water storage cavity 11, in one possible implementation manner, a top cover 15 is disposed on the top of the water storage cavity 11, and a pumping hole for the pumping pipe 5 to pass through is disposed on the top cover 15. In addition, a micro submersible pump 6 is arranged in the water storage cavity 11, the micro submersible pump 6 is connected with the water pumping pipe 5, and the micro submersible pump 6 is used for pumping water in the water storage cavity 11 to the upper part of the ground through the water pumping pipe 5 when the micro submersible pump 6 is started so as to be used by users, such as toilet flushing, irrigation and the like.
The embodiment of the utility model provides a water storage overflows and strains device, overflows water storage filtration tank 1 and designs for sleeve structure for including water storage chamber 11, overflow filter chamber 12 outside, overflow filter chamber 12 in by lower supreme laying sand gravel layer 21, sand bed 22 and soil layer 3 in proper order, and water storage chamber 11 and overflow filter chamber 12 exist in a bottom surface. The drainage pipe is arranged by opening a hole at the bottom of the water storage cavity 11, and the outer wall of the water distribution pipe 4 positioned in the overflow filter cavity 12 is provided with a plurality of water distribution holes 41, so that clear water in the water storage cavity 11 can automatically flow into the overflow filter cavity 12 from bottom to top by the pressure of the water, and the clear water passes through the sand gravel layer 21 and the sand layer 22 for secondary filtration, the water level reaches the position where the sand layer 22 is bordered by the soil layer 3 at the overflow hole 14, the water level keeps a certain height, part of the water is absorbed by the root system of the plant on the upper part of the soil layer 3, and the surplus water overflows out of the tank to supplement shallow groundwater. By the operation, a certain amount of reclaimed water can be stored and recycled, and the on-site consumption of the redundant part can be realized, so that the harm of discharge is avoided; and the user can also open the micro submersible pump 6 to enable the water inside the water storage cavity 11 to be pumped to the ground through the water pumping pipe 5, so that the user can conveniently use the water storage cavity for irrigation.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.
Claims (10)
1. The utility model provides a courtyard formula domestic sewage purifies groove water storage and overflows and strain device which characterized in that, it includes:
a sleeve-type water storage and overflow canister (1) for being buried under ground level, the inner cavity of the water storage and overflow canister (1) comprising: the water storage device comprises a water storage cavity (11) and an overflow filtering cavity (12) positioned outside the water storage cavity (11), wherein a water inlet (13) is formed in the upper part of the water storage cavity (11), the bottom of the water storage cavity (11) is communicated with the overflow filtering cavity (12), and an overflow hole (14) is formed in the upper part of the overflow filtering cavity (12);
the filter medium (2) is filled in the overflow filter cavity (12).
2. The water storage and filtration device of the courtyard-type domestic sewage purification tank of claim 1, wherein the filter medium (2) comprises a gravel layer (21) and a sand layer (22) from bottom to top in sequence, a soil layer (3) for planting water-resistant vegetation is arranged above the sand layer (22), and water in the water storage cavity (11) flows to the soil layer (3) through the filter medium (2) so that the soil layer (3) forms the water-resistant vegetation wetland (16).
3. The water storage overflow and filtration device for the courtyard-type domestic sewage purification tank as claimed in claim 2, wherein the overflow hole (14) is located at the border between the sand layer (22) and the soil layer (3).
4. The water storage overflow and filtration device for the courtyard-type domestic sewage purification tank as claimed in claim 1, wherein the water inlet (13) is located above the overflow hole (14).
5. The water storage overflow and filtration device of the courtyard-type domestic sewage purification tank as claimed in claim 1, wherein the bottom of the water storage cavity (11) is communicated with the overflow and filtration cavity (12) through a water distribution pipe (4).
6. The water storage and filtration device of the courtyard-type domestic sewage purification tank as claimed in claim 5, wherein a plurality of the water distribution pipes (4) are arranged, and a plurality of the water distribution pipes (4) are uniformly distributed into the filtration overflow chamber (12) along the circumferential turns of the water storage chamber (11).
7. The water storage and filtration device of the courtyard-type domestic sewage purification tank of claim 5, wherein one end of the water distribution pipe (4) is located in the water storage cavity (11), the other end of the water distribution pipe is located in the filtration overflow cavity (12), a plurality of water distribution holes (41) are formed in the outer wall of the water distribution pipe (4) located in the filtration overflow cavity (12), and the water distribution holes (41) are used for allowing water in the water storage cavity (11) to overflow into the bottom of the filter medium (2).
8. The water storage overflow and filtration device for the courtyard-type domestic sewage purification tank as claimed in claim 1, wherein a top cover (15) is arranged on the top of the water storage cavity (11), and a water pumping pipe hole for a water pumping pipe (5) to pass through is arranged on the top cover (15).
9. The water storage and overflowing and filtering device of the courtyard-type domestic sewage purifying tank as claimed in claim 8, wherein a micro submersible pump (6) is disposed inside the water storage cavity (11), the micro submersible pump (6) is connected with the water pumping pipe (5), and the micro submersible pump (6) is used for pumping the water inside the water storage cavity (11) to the ground through the water pumping pipe (5) when being opened.
10. The water storage overflow filtering device of the courtyard type domestic sewage purifying tank as claimed in claim 1, wherein the material of the water storage overflow filtering tank (1) is glass fiber reinforced plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021296759.6U CN212640230U (en) | 2020-07-06 | 2020-07-06 | Water storage overflow filtering device for courtyard type domestic sewage purifying tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021296759.6U CN212640230U (en) | 2020-07-06 | 2020-07-06 | Water storage overflow filtering device for courtyard type domestic sewage purifying tank |
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| Publication Number | Publication Date |
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| CN212640230U true CN212640230U (en) | 2021-03-02 |
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| CN202021296759.6U Active CN212640230U (en) | 2020-07-06 | 2020-07-06 | Water storage overflow filtering device for courtyard type domestic sewage purifying tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115784454A (en) * | 2022-11-30 | 2023-03-14 | 宁夏水投云澜科技股份有限公司 | Constructed wetland system for rural sewage treatment and sewage treatment method |
-
2020
- 2020-07-06 CN CN202021296759.6U patent/CN212640230U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115784454A (en) * | 2022-11-30 | 2023-03-14 | 宁夏水投云澜科技股份有限公司 | Constructed wetland system for rural sewage treatment and sewage treatment method |
| CN115784454B (en) * | 2022-11-30 | 2025-06-06 | 宁夏水投云澜科技股份有限公司 | Artificial wetland system for rural sewage treatment and sewage treatment method |
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