CN111547865A - Construction method of water-stacking type stepped constructed wetland system - Google Patents
Construction method of water-stacking type stepped constructed wetland system Download PDFInfo
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- CN111547865A CN111547865A CN202010437118.6A CN202010437118A CN111547865A CN 111547865 A CN111547865 A CN 111547865A CN 202010437118 A CN202010437118 A CN 202010437118A CN 111547865 A CN111547865 A CN 111547865A
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- wetland
- flow wetland
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
- 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
Abstract
The invention relates to a construction method of a water-stacking type stepped constructed wetland system, which is characterized in that a slope is trimmed during substrate treatment, a foundation is excavated on the slope, and a multistage stepped wetland foundation pit platform is built; then backfilling the plain base and planting emergent aquatic plants.
Description
Technical Field
The invention belongs to the technical field of ecological landscape engineering construction, and particularly relates to a construction method of a water-stacking type stepped constructed wetland system.
Background
At present, the artificial wetland is constructed by building a pool or a groove artificially, laying an anti-seepage water-proof layer on the ground, filling a matrix layer with a certain depth, planting plants on the matrix layer, and purifying sewage by utilizing the physical, chemical and biological synergistic effects of the matrix, the plants and microorganisms. From the practical point of view, the artificial wetland can be divided into a surface flow artificial wetland, a horizontal subsurface flow artificial wetland and a vertical subsurface flow artificial wetland according to the difference of the water distribution modes or the difference of the water flow modes of the system. Compared with horizontal subsurface flow constructed wetlands and vertical subsurface flow constructed wetlands, the surface flow wetlands have the advantages of investment saving, low operating cost, simplicity and convenience in operation and the like, but also have the defects of low load, limited dirt-removing capacity and the like, the operation of the flow constructed wetlands is greatly influenced by natural weather conditions, mosquitoes and flies are easy to breed in summer, and odor is generated to influence the periphery of the wetlands. Therefore, the single surface flow artificial wetland is less in practical engineering application in China, and is mostly applied to horizontal subsurface flow or vertical subsurface flow.
For this problem, researchers have made preliminary exploration, for example, in the prior patent CN2015105940408, a stepped horizontal subsurface flow constructed wetland combination system and its application are disclosed, the combination system is built according to a slope topography, and includes a plurality of stages of horizontal subsurface flow constructed wetland units arranged in a stepped manner from top to bottom according to a slope gradient, and a pipe network unit communicating the horizontal subsurface flow constructed wetland units, the horizontal subsurface flow constructed wetland unit adopts a side water inlet mode, and water flows in the horizontal subsurface flow constructed wetland unit horizontally along the length direction of the horizontal subsurface flow constructed wetland unit. The constructed wetland system breaks through the limitation of the terrain on the application of the constructed wetland, can fully utilize the space of the sloping field, has simple structure, simple and convenient construction and low cost, can be widely applied to the treatment of various sewage such as domestic sewage, municipal sewage, industrial wastewater, animal husbandry sewage, agricultural non-point source pollution, surface runoff, tail water of a sewage treatment plant and the like in sloping areas such as mountainous regions, hills, water slopes and the like, and greatly expands the application range of the constructed wetland.
However, the water distribution mode of side water inflow increases water flow resistance and increases water distribution energy consumption, and is not suitable for the form requirement of energy conservation and emission reduction.
Disclosure of Invention
The invention aims to provide an energy-saving and emission-reducing construction method of a water-stacking type stepped constructed wetland system, which adopts the following technical scheme:
the construction method of the water-stacking type stepped constructed wetland system comprises the following steps:
(1) substrate treatment
1) Trimming the slope, excavating a foundation on the slope, constructing a multistage stepped wetland foundation pit platform, dividing each stage of wetland foundation pit platform into each surface flow wetland foundation pit and every two subsurface flow wetland foundation pits in the direction from high to low, and arranging an overflow well which is lower than the surface flow wetland foundation pits and higher than the subsurface flow wetland foundation pits at the joint of the surface flow wetland foundation pits and the subsurface flow wetland foundation pits;
2) installing a reinforced concrete prefabricated well body between the surface flow wetland foundation pit and the overflow well, applying reinforced concrete cast-in-place to form a first overflow wall between the overflow well and the subsurface flow wetland foundation pit, applying reinforced concrete cast-in-place to form a second overflow wall between the two subsurface flow wetland foundation pits, applying reinforced concrete cast-in-place to form a third overflow wall between the subsurface flow wetland foundation pit and the surface flow wetland foundation pit, wherein the well body is lower than the first overflow wall adjacent to the downstream of the well body, the first overflow wall and the third overflow wall are gradually reduced from high to low according to the distribution positions of the first overflow wall and the third overflow wall, and a water supply pipe with an upstream end suspended in the overflow well and a downstream end capable of being inserted into backfill materials in the subsurface flow wetland foundation pits is penetrated through the first overflow wall;
(2) elemental backfill
Sequentially backfilling plain soil, coarse sand, epoxy resin, three cloth of two membranes and gravels in the subsurface flow wetland foundation pit, sequentially backfilling plain soil, coarse sand, epoxy resin and three cloth of two membranes in the surface flow wetland foundation pit, sequentially backfilling plain soil, concrete, epoxy resin, three cloth of two membranes and cement mortar in the overflow well, constructing by adopting a self-leveling process for the epoxy resin, and bonding the three cloth of two membranes on the surface of the epoxy resin;
(3) emerging plant planting
Emergent aquatic plants are planted in the surface flow wetland foundation pit and the subsurface flow wetland foundation pit.
Preferably, a non-woven geotextile is laid above the gravel in the subsurface flow wetland, planting soil is arranged above the non-woven geotextile, and emergent aquatic plants are planted on the planting soil.
Preferably, the overflow well is also provided with a non-clay brick wall which is positioned at the upstream of the well body and is built by cement mortar, and the top of the non-clay brick wall is lower than the position of one half height of the well body.
Preferably, a vertical carbon sponge layer is laid between the non-clay wall brick and the well body, a transverse carbon sponge layer laid below the well body is integrally arranged at the bottom of the carbon sponge layer, and a water permeable hole located at the bottom of the well body is arranged above the transverse carbon sponge layer.
The invention has the beneficial effects that:
the invention utilizes the alternate mode of surface flow wetland and subsurface flow wetland to replace the prior subsurface flow wetland with side water inlet, thereby ensuring the purification effect on one hand, and rapidly purifying by utilizing the flow of reclaimed water between high and low drop, thereby realizing the functions of energy conservation and emission reduction.
Drawings
Fig. 1 is a schematic view of the water-stacking type stepped constructed wetland system of the invention.
Detailed Description
Referring to fig. 1, the structure of the water-stacking type stepped constructed wetland system of the invention is shown, and the construction method thereof is as follows:
(1) substrate treatment
1) Trimming the slope, excavating a foundation on the slope, constructing a multistage stepped wetland foundation pit platform, dividing each stage of wetland foundation pit platform into each surface flow wetland foundation pit 1 and each two subsurface flow wetland foundation pits 2 in the direction from high to low, and arranging an overflow well 3 which is lower than the surface flow wetland foundation pits 1 and higher than the subsurface flow wetland foundation pits 2 at the joint of the surface flow wetland foundation pits 1 and the subsurface flow wetland foundation pits 2;
2) a reinforced concrete prefabricated well body 31 is arranged between the surface flow wetland foundation pit 1 and the overflow well 3, a reinforced concrete cast-in-situ formed first overflow wall 4 is applied between the overflow well 3 and the subsurface flow wetland foundation pit 2, a reinforced concrete cast-in-situ formed second overflow wall is applied between the two subsurface flow wetland foundation pits 2, a reinforced concrete cast-in-situ formed third overflow wall is applied between the subsurface flow wetland foundation pit 2 and the surface flow wetland foundation pit 1, the well body 31 is lower than the adjacent first overflow wall 4 at the downstream, the first and the third overflow walls are gradually reduced from the high direction to the low direction according to the distribution position, the upstream end of the first overflow wall 4 is suspended in the overflow well 3, the downstream end can be inserted into a water supply pipe 5 in backfill in the subsurface flow wetland foundation pit 2, a non-clay brick wall 6 which is arranged at the upstream of the well body 31 and is built by cement mortar is also arranged in the overflow well 3, the top of the non-clay brick wall 6 is lower than the half height position of the well body 31, a vertical carbon sponge layer 71 is laid between the non-clay wall bricks 6 and the well body 31, a transverse carbon sponge layer 72 laid below the well body 31 is integrally arranged at the bottom of the vertical carbon sponge layer 71, and water permeable holes positioned at the bottom of the well body 31 are arranged above the transverse carbon sponge layer 72;
(2) elemental backfill
Sequentially backfilling plain soil, coarse sand, epoxy resin, three cloth membranes, two membranes, gravel, non-woven geotextile and planting soil in the subsurface flow wetland foundation pit 2, sequentially backfilling plain soil, coarse sand, epoxy resin and three cloth membranes in the surface flow wetland foundation pit 1, sequentially backfilling plain soil, concrete, epoxy resin, three cloth membranes and cement mortar in the overflow well 3, constructing by adopting a self-leveling process for the epoxy resin, and bonding the three cloth membranes and the two membranes on the surface of the epoxy resin;
(3) emerging plant planting
Emergent aquatic plants are planted in the surface flow wetland foundation pit 1 and the subsurface flow wetland foundation pit 2.
Preferably, when a foundation pit is excavated, floating soil, garbage, stones and organic matters are removed, a road roller of 8 t-12 t is selected for rolling for 3 times, a hand-held vibrating rammer is selected for rolling at a place where the road roller can not be unfolded, a sampling test is carried out after the rolling is finished, the compaction coefficient reaches 0.93-0.97, the permeability coefficient is less than or equal to 0.0003, and the bearing capacity is greater than or equal to 130 kN/m.
Preferably, during backfilling, the first layer of clay substrate is backfilled, the loose filling thickness is 300mm, manual or mechanical leveling is performed, a road roller of 8 t-12 t is selected for rolling for 6 times, wherein static pressure is 4 times, vibration rolling is 2 times, sampling tests are performed after rolling is finished, the compaction coefficient reaches 0.93-0.97, and the permeability coefficient is less than or equal to 0.0001.
The above description is only about the preferred embodiment of the present invention, but it should not be understood as limiting the claims, and the present invention may be modified in other structures, not limited to the above structures. In general, all changes which come within the scope of the invention are intended to be embraced therein.
Claims (4)
1. The construction method of the water-stacking type stepped constructed wetland system is characterized by comprising the following steps:
(1) substrate treatment
1) Trimming the slope, excavating a foundation on the slope, constructing a multistage stepped wetland foundation pit platform, dividing each stage of wetland foundation pit platform into each surface flow wetland foundation pit and every two subsurface flow wetland foundation pits in the direction from high to low, and arranging an overflow well which is lower than the surface flow wetland foundation pits and higher than the subsurface flow wetland foundation pits at the joint of the surface flow wetland foundation pits and the subsurface flow wetland foundation pits;
2) installing a reinforced concrete prefabricated well body between the surface flow wetland foundation pit and the overflow well, applying reinforced concrete cast-in-place to form a first overflow wall between the overflow well and the subsurface flow wetland foundation pit, applying reinforced concrete cast-in-place to form a second overflow wall between the two subsurface flow wetland foundation pits, applying reinforced concrete cast-in-place to form a third overflow wall between the subsurface flow wetland foundation pit and the surface flow wetland foundation pit, wherein the well body is lower than the first overflow wall adjacent to the downstream of the well body, the first overflow wall and the third overflow wall are gradually reduced from high to low according to the distribution positions of the first overflow wall and the third overflow wall, and a water supply pipe with an upstream end suspended in the overflow well and a downstream end capable of being inserted into backfill materials in the subsurface flow wetland foundation pits is penetrated through the first overflow wall;
(2) elemental backfill
Sequentially backfilling plain soil, coarse sand, epoxy resin, three cloth of two membranes and gravels in the subsurface flow wetland foundation pit, sequentially backfilling plain soil, coarse sand, epoxy resin and three cloth of two membranes in the surface flow wetland foundation pit, sequentially backfilling plain soil, concrete, epoxy resin, three cloth of two membranes and cement mortar in the overflow well, constructing by adopting a self-leveling process for the epoxy resin, and bonding the three cloth of two membranes on the surface of the epoxy resin;
(3) emerging plant planting
Emergent aquatic plants are planted in the surface flow wetland foundation pit and the subsurface flow wetland foundation pit.
2. The construction method of the stacked stepped constructed wetland system of claim 1, wherein a non-woven geotextile is laid over the gravel in the subsurface wetland, planting soil is laid over the non-woven geotextile, and emergent aquatic plants are planted on the planting soil.
3. The construction method of the stacked stepped constructed wetland system according to claim 1 or 2,
the overflow well is also provided with a non-clay brick wall which is positioned at the upper stream of the well body and is built by cement mortar, and the top of the non-clay brick wall is lower than the position of one half height of the well body.
4. The construction method of the water-stacking-type stepped constructed wetland system as claimed in claim 3, wherein a vertical carbon sponge layer is laid between the non-clay wall bricks and the well body, a horizontal carbon sponge layer laid under the well body is integrally formed at the bottom of the carbon sponge layer, and water permeable holes located at the bottom of the well body are formed above the horizontal carbon sponge layer.
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| CN202010437118.6A CN111547865A (en) | 2020-05-21 | 2020-05-21 | Construction method of water-stacking type stepped constructed wetland system |
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| CN202010437118.6A CN111547865A (en) | 2020-05-21 | 2020-05-21 | Construction method of water-stacking type stepped constructed wetland system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201056522Y (en) * | 2007-05-16 | 2008-05-07 | 山东大学 | Undercurrent and drift current integrated artificial wet land |
| CN201952332U (en) * | 2011-01-28 | 2011-08-31 | 李迎军 | Self-oxygenated subsurface-flow constructed-wetland sewage-purifying device |
| CN102674631A (en) * | 2012-05-10 | 2012-09-19 | 复旦大学 | Method and system for advanced treatment of centralized rural domestic sewage |
| CN105776555A (en) * | 2016-03-30 | 2016-07-20 | 中南林业科技大学 | Multiple wetland system applicable to treating decentralized rural domestic sewage |
| KR20160104841A (en) * | 2015-02-26 | 2016-09-06 | 공주대학교 산학협력단 | Hybrid artificial wetland |
| CN108217959A (en) * | 2018-01-24 | 2018-06-29 | 桑德生态科技有限公司 | For the intensified denitrification and dephosphorization artificial wet land system of low carbon-nitrogen ratio sewage processing |
| CN110357267A (en) * | 2019-07-31 | 2019-10-22 | 江苏山水环境建设集团股份有限公司 | Step multistage drowned flow artificial wet land processing pond and its construction method |
-
2020
- 2020-05-21 CN CN202010437118.6A patent/CN111547865A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201056522Y (en) * | 2007-05-16 | 2008-05-07 | 山东大学 | Undercurrent and drift current integrated artificial wet land |
| CN201952332U (en) * | 2011-01-28 | 2011-08-31 | 李迎军 | Self-oxygenated subsurface-flow constructed-wetland sewage-purifying device |
| CN102674631A (en) * | 2012-05-10 | 2012-09-19 | 复旦大学 | Method and system for advanced treatment of centralized rural domestic sewage |
| KR20160104841A (en) * | 2015-02-26 | 2016-09-06 | 공주대학교 산학협력단 | Hybrid artificial wetland |
| CN105776555A (en) * | 2016-03-30 | 2016-07-20 | 中南林业科技大学 | Multiple wetland system applicable to treating decentralized rural domestic sewage |
| CN108217959A (en) * | 2018-01-24 | 2018-06-29 | 桑德生态科技有限公司 | For the intensified denitrification and dephosphorization artificial wet land system of low carbon-nitrogen ratio sewage processing |
| CN110357267A (en) * | 2019-07-31 | 2019-10-22 | 江苏山水环境建设集团股份有限公司 | Step multistage drowned flow artificial wet land processing pond and its construction method |
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Application publication date: 20200818 |