CN114349284A - Ecological wetland sewage treatment system and method - Google Patents
Ecological wetland sewage treatment system and method Download PDFInfo
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- CN114349284A CN114349284A CN202210033254.8A CN202210033254A CN114349284A CN 114349284 A CN114349284 A CN 114349284A CN 202210033254 A CN202210033254 A CN 202210033254A CN 114349284 A CN114349284 A CN 114349284A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000002689 soil Substances 0.000 claims abstract description 40
- 239000000945 filler Substances 0.000 claims abstract description 34
- 238000001179 sorption measurement Methods 0.000 claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 241000196324 Embryophyta Species 0.000 claims description 40
- 230000000694 effects Effects 0.000 claims description 17
- 244000205574 Acorus calamus Species 0.000 claims description 6
- 241001494508 Arundo donax Species 0.000 claims description 6
- 235000011996 Calamus deerratus Nutrition 0.000 claims description 6
- 235000014676 Phragmites communis Nutrition 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
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- 240000008555 Canna flaccida Species 0.000 claims description 4
- 241001233914 Chelidonium majus Species 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 4
- 241000049624 Alisma plantago-aquatica subsp. orientale Species 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 241000722731 Carex Species 0.000 claims description 3
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- 239000004113 Sepiolite Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229920005610 lignin Polymers 0.000 claims description 3
- 229910052624 sepiolite Inorganic materials 0.000 claims description 3
- 235000019355 sepiolite Nutrition 0.000 claims description 3
- 244000071493 Iris tectorum Species 0.000 claims description 2
- 240000007049 Juglans regia Species 0.000 claims description 2
- 235000009496 Juglans regia Nutrition 0.000 claims description 2
- 240000009132 Sagittaria sagittifolia Species 0.000 claims 1
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Images
Classifications
-
- 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
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Abstract
The invention relates to the technical field of water treatment, and discloses an ecological wetland sewage treatment system which comprises an ecological ditch, a water storage well and an artificial wetland, wherein the ecological ditch, the water storage well and the artificial wetland are sequentially communicated; the constructed wetland is sequentially provided with a rubble layer, a nano adsorption layer and a second soil layer from bottom to top, the nano adsorption layer is formed by laying a mixture of nano filler and nano zero-valent iron, evergreen water-resistant plants are planted on the second soil layer, and the bottom of the water storage well is communicated with the constructed wetland corresponding to the rubble layer. The sewage treatment method comprises the step of treating rural sewage by adopting the sewage treatment system. The system has simple structure and low later-stage operation and maintenance cost, and can reach four water quality standards after rural sewage treatment.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to an ecological wetland sewage treatment system and method.
Background
With the rapid development of rural economy in China, the living standard of farmers is greatly improved, but rural environment construction and economic development are asynchronous, and the rural sewage discharge amount is increased year by year. Under the conditions that the economy is continuously and stably increased and the population of villages is continuously increased, the total amount of sewage discharged from the villages and the towns is increased, and the untreated sewage is discharged randomly, so that the water quality of ditches and ponds is blackened and becomes odorous, mosquitoes grow, the living environment of the villages is influenced, the health of the villages is threatened, and the ecological restoration of the sewage in the villages and the towns is urgent. In sewage treatment, a plurality of mature processes such as an activated sludge process, a biofilm process, an ecological treatment process and the like exist, and the methods have the problems of high operation and maintenance cost, non-sustainable treatment effect and the like. Therefore, it is particularly important to actively explore a sustainable ecological treatment technology for rural sewage.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide an ecological wetland sewage treatment system and a sewage treatment method.
The invention is realized by the following steps:
in a first aspect, the invention provides an ecological wetland sewage treatment system, which comprises an ecological ditch, a water storage well and an artificial wetland which are sequentially communicated.
The bottom of the ecological ditch is provided with a nano filler layer, a first soil layer is arranged on the nano filler layer, evergreen aquatic plants with dirt cleaning capacity are planted on the first soil layer, short evergreen water-resistant plants are planted on the side wall of the ditch to achieve a wall protection effect, and the upper part of the ecological ditch is communicated with a water storage well;
the constructed wetland is sequentially provided with a rubble layer, a nano adsorption layer and a second soil layer from bottom to top, the nano adsorption layer is formed by laying a mixture of nano filler and nano zero-valent iron, evergreen water-resistant plants are planted on the second soil layer, and the bottom of the water storage well is communicated with the constructed wetland corresponding to the rubble layer.
In an alternative embodiment, the nanofiller forming the nanofiller layer comprises at least one of a polyurethane nanofiller, a carbon-based nanofiller, a modified sepiolite filler, and a lignin nanofiller.
In an optional embodiment, the mass ratio of the nano filler to the nano zero-valent iron is 6-8: 3.
In an optional embodiment, the thickness of the nano filler layer is 5-10 cm, and the thickness of the first soil layer is 15-20 cm.
In an alternative embodiment, the evergreen aquatic plant having a net-soil capability comprises at least one of coprinus, montelukast arrowhead, celandine, turelia, reed, calamus, and arundo donax.
In an alternative embodiment, the low evergreen water-tolerant plant comprises at least one of Yudai grass, Carex yeensis, Saururus chinensis, Alisma orientale, and Gekko Swinhonis.
In an optional embodiment, the thickness of the crushed stone layer is 5-10 cm, the thickness of the nanometer adsorption layer is 5-10 cm, and the thickness of the second soil layer is 15-20 cm.
In alternative embodiments, the evergreen water-tolerant plant comprises at least one of spider orchid, iris, and loosestrife.
In a second aspect, the invention provides a sewage treatment method, which comprises introducing rural sewage into the ecological wetland sewage treatment system according to any one of the preceding embodiments for treatment.
In an optional embodiment, the retention time of the sewage in the ecological ditch is 20-28 h, and the retention time in the impounded water well is 10-14 h.
The invention has the following beneficial effects:
the ecological wetland sewage treatment system couples the ecological ditch with the constructed wetland, after rural sewage enters the ecological wetland sewage treatment system, the rural sewage is primarily treated by the ecological ditch, the primarily treated sewage enters the constructed wetland, and only the sewage stays for a proper time in the ecological ditch and the constructed wetland, so that the effluent quality can reach four water quality standards. The application provides a sewage treatment system, the construction cost is low, and the operation maintenance cost is low after the construction, and treatment effect is better.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an ecological wetland sewage treatment system provided by the embodiment of the application.
Icon: 100-an ecological wetland sewage treatment system; 110-ecological ditch; 111-nano filler layer; 112-a first soil layer; 113-a first valve; 120-water storage well; 130-artificial wetland; 131-a crushed stone layer; 132-a nano-adsorption layer; 133-a second soil layer; 134-second valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following describes the ecological wetland sewage treatment system 100 and the water treatment method provided by the embodiment of the invention.
As shown in fig. 1, the ecological wetland sewage treatment system 100 provided by the embodiment of the present application comprises an ecological ditch 110, a water storage well 120 and an artificial wetland 130 which are sequentially communicated.
The bottom of the ecological ditch 110 is provided with a nanometer packing layer 111, a first soil layer 112 is arranged on the nanometer packing layer 111, evergreen aquatic plants with dirt cleaning capacity are planted on the first soil layer 112, short evergreen water-resistant plants are planted on the side wall of the ditch to achieve a wall protection effect, and the upper part of the ecological ditch 110 is communicated with the water storage well 120.
The constructed wetland 130 is sequentially provided with a rubble layer 131, a nano adsorption layer 132 and a second soil layer 133 from bottom to top, the nano adsorption layer 132 is formed by laying a mixture of nano fillers and nano zero-valent iron, evergreen water-resistant plants are planted on the second soil layer 133, and the bottom of the water storage well 120 is communicated with the position, corresponding to the rubble layer 131, of the constructed wetland 130.
The nano filler layer 111 arranged at the bottom in the ecological ditch 110 is formed by laying nano fillers, and the nano fillers have larger specific surface area and can effectively adsorb pollutants; the first soil layer 112 is arranged on the nano filler layer 111, evergreen aquatic plants with dirt purifying capacity are planted on the first soil layer 112, the evergreen aquatic plants play a role of primarily purifying water bodies, the low evergreen water-resistant plants planted on the side walls of the ecological ditch 110 play a role of protecting walls and preventing the ditch from collapsing due to long-term hydraulic washing, the planting density of the evergreen aquatic plants is based on the fact that the evergreen aquatic plants can completely cover the walls of the ditch, the evergreen aquatic plants are primarily treated by the ecological ditch 110 and then collected in the impoundment well 120, sewage in the impoundment well 120 permeates into the rubble layer 131 of the artificial wetland 130 from the bottom of the impoundment well, the rubble layer 131 in the artificial wetland 130 plays a role of compacting soil at the bottom, the entering sewage is filtered, nano zero-valent iron with a large specific surface area has a good removing effect on COD, BOD and heavy metal ions in the water bodies in the nano adsorption layer 132, and the nano zero-valent iron and the nano filler are mixed to form the nano adsorption layer 132, the pollutants in the water can be well removed, the sewage reaches the second soil layer 133 after being treated by the nano adsorption layer 132, the root systems of the evergreen water-resistant plants are rooted in the second soil layer 133, and the root systems of the evergreen water-resistant plants can also absorb organic matters in the water, which are respectively treated by microorganisms and nano zero-valent iron, as nutrient substances, so that the water is further purified.
Rural sewage has the characteristics of complex components, a certain amount of nitrogen and phosphorus, large water quality fluctuation and strong biodegradability. The ecological wetland sewage treatment system 100 provided by the embodiment of the application couples the ecological ditch 110 and the artificial wetland 130, after rural sewage enters the ecological wetland sewage treatment system 100, the rural sewage is primarily treated by the ecological ditch 110, the primarily treated sewage enters the artificial wetland 130, and the effluent quality can reach four water quality standards only by staying the sewage in the ecological ditch 110 and the artificial wetland 130 for a proper time. The application provides a sewage treatment system, the construction cost is low, and the operation maintenance cost is low after the construction, and treatment effect is better. Therefore, the ecological wetland sewage treatment system 100 provided by the embodiment of the application is suitable for treating rural sewage.
Preferably, an overflow port is arranged at the top of one end of the ecological canal 110 connected with the water storage well 120, and the overflow port is provided with a first valve 113. A second valve 134 is provided at a position where the bottom of the water storage well 120 is connected to the artificial wetland 130. The staying time of the sewage in the ecological ditch 110 and the constructed wetland 130 can be known through the opening and closing of the first valve 113 and the second valve 134, so that the target water treatment effect can be achieved.
With respect to the ecological trench 110:
preferably, the nanofiller forming the nanofiller layer 111 is a commercially available nanofiller for water pollution treatment, which includes at least one of a polyurethane nanofiller, a carbon-based nanofiller, a modified sepiolite filler, and a lignin nanofiller.
Preferably, the thickness of the nanofiller layer 111 is 5 to 10cm (e.g., 5cm, 8cm, or 10cm) for better water treatment effect.
Further, in order to make it better for the planted evergreen aquatic plants to grow, the thickness of the first soil layer 112 is 15-20 cm (for example, 15cm, 18cm or 20 cm).
Preferably, the evergreen aquatic plant having a dirt-cleaning ability selects an evergreen aquatic plant having a strong dirt-cleaning ability, which includes at least one of coprinus atrata, menton arrowhead, celandine, turelia, reed, calamus, and arundo donax. Planting at the density of 100% of the coverage after the mature growth.
Preferably, in order to achieve good wall protection effect, the side wall of the ditch is planted with short evergreen water-resistant plants including at least one of Yudaicao, Carex yeensis, Saururus chinensis, Alisma orientale and Juglans regia. Planting at the density of 100% of the coverage after the mature growth. The short plants are selected to avoid reducing resistance to water flow, and are relatively less affected by water power scouring and easier to survive.
Regarding the artificial wetland 130:
preferably, in order to achieve a better water treatment effect, the mass ratio of the nano filler to the nano zero-valent iron is 6-8: 3 (for example, 6:3, 7:3 or 8: 3).
Preferably, in order to achieve better water treatment effect, the thickness of the crushed stone layer 131 is 5 to 10cm (for example, 5cm, 8cm or 10cm), and the thickness of the nano adsorption layer 132 is 5 to 10cm (for example, 5cm, 8cm or 10 cm).
Further, in order to ensure a better water treatment effect and to make the plants planted on the artificial wetland 130 grow better, the thickness of the second soil layer 133 is 15 to 20cm (for example, 15cm, 18cm, or 20 cm).
Preferably, for better wastewater treatment, the evergreen water-tolerant plants include at least one of spider orchid, iris tectorum and loosestrife, and are planted at a density such that the coverage reaches 100% after the plants grow to maturity.
The sewage treatment method provided by the embodiment of the application comprises the step of introducing rural sewage into the ecological wetland sewage treatment system 100 provided by the embodiment of the application for treatment. The water treatment method adopts the system provided by the embodiment of the application to treat rural sewage, so that a good treatment effect can be obtained.
Preferably, in order to achieve better treatment effect, the retention time of the sewage in the ecological ditch is 20-28 h, and the retention time in the impounded water well is 10-14 h.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The ecological wetland sewage treatment system 100 that this application embodiment provided, it specifically is:
the nano filler of the nano filler layer 111 is polyurethane nano filler, and the thickness is 5 cm; the thickness of the first soil layer 112 is 15cm, the plants planted on the first soil layer 112 are canna, loosestrife and vernolia, and the plants planted on the side wall of the ditch are white-happiness grass and pennisetum alopecuroides.
The thickness of the crushed stone layer 131 is 5cm, the thickness of the nano adsorption layer 132 is 5cm, the mass ratio of the nano filler to the nano zero-valent iron in the nano adsorption layer 132 is 6:3, the thickness of the second soil layer 133 is 15cm, and the plants planted on the second soil layer 133 are reed, calamus and bamboo reed.
Example 2
The ecological wetland sewage treatment system 100 that this application embodiment provided, it specifically is:
the nano filler of the nano filler layer 111 is polyurethane nano filler, and the thickness is 10 cm; the thickness of the first soil layer 112 is 20cm, the plants planted on the first soil layer 112 are canna, loosestrife and vernolia, and the plants planted on the side wall of the ditch are white-happiness grass and pennisetum alopecuroides.
The thickness of the crushed stone layer 131 is 10cm, the thickness of the nano adsorption layer 132 is 10cm, the mass ratio of nano fillers to nano zero-valent iron in the nano adsorption layer 132 is 8:3, the thickness of the second soil layer 133 is 20cm, and the plants planted on the second soil layer 133 are reed, calamus and bamboo reed.
Example 3
The ecological wetland sewage treatment system 100 that this application embodiment provided, it specifically is:
the nano filler of the nano filler layer 111 is polyurethane nano filler, and the thickness is 8 cm; the thickness of the first soil layer 112 is 18cm, the plants planted on the first soil layer 112 are canna, loosestrife and vermouth, and the plants planted on the side wall of the ditch are white-happiness grass and pennisetum alopecuroides. The thickness of the crushed stone layer 131 is 8cm, the thickness of the nano adsorption layer 132 is 8cm, the mass ratio of nano fillers to nano zero-valent iron in the nano adsorption layer 132 is 7:3, the thickness of the second soil layer 133 is 18cm, and the plants planted on the second soil layer 133 are reed, calamus and bamboo reed.
Example 4
This embodiment is substantially the same as embodiment 3 except that: the mass ratio of the nano filler to the nano zero-valent iron is 4: 3.
Example 5
This embodiment is substantially the same as embodiment 3 except that: the mass ratio of the nano filler to the nano zero-valent iron is 10: 3.
The examples 1 to 5 show good treatment effect when applied to actual rural sewage treatment, and particularly the examples 1 to 3 show better treatment effect on rural sewage.
In summary, in the ecological wetland sewage treatment system 100 and the method, due to the specific structural arrangement of the ecological ditch 110 and the artificial wetland 130, the ecological ditch 110 is coupled with the artificial wetland 130, after rural sewage enters the ecological wetland sewage treatment system 100, the rural sewage is primarily treated by the ecological ditch 110, the primarily treated sewage enters the artificial wetland 130, and the effluent quality can reach four water quality standards.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An ecological wetland sewage treatment system is characterized by comprising an ecological ditch, a water storage well and an artificial wetland which are communicated in turn,
the ecological ditch is characterized in that a nanometer packing layer is arranged at the bottom of the ecological ditch, a first soil layer is arranged on the nanometer packing layer, evergreen aquatic plants with dirt cleaning capacity are planted on the first soil layer, short evergreen water-resistant plants are planted on the side wall of the ditch to achieve a wall protection effect, and the upper part of the ecological ditch is communicated with the water storage well;
the constructed wetland is sequentially provided with a rubble layer, a nano adsorption layer and a second soil layer from bottom to top, the nano adsorption layer is formed by laying a mixture of nano filler and nano zero-valent iron, evergreen water-resistant plants are planted on the second soil layer, and the bottom of the water storage well is communicated with the corresponding rubble layer of the constructed wetland.
2. The ecological wetland sewage treatment system of claim 1, wherein the nanofiller forming the nanofiller layer comprises at least one of polyurethane nanofillers, carbon-based nanofillers, modified sepiolite fillers, and lignin nanofillers.
3. The ecological wetland sewage treatment system of claim 1, wherein the mass ratio of the nano-filler to the nano zero-valent iron is 6-8: 3.
4. The ecological wetland sewage treatment system of claim 1, wherein the thickness of the nano filler layer is 5-10 cm, and the thickness of the first soil layer is 15-20 cm.
5. The ecological wetland sewage treatment system of claim 1, wherein the evergreen aquatic plants with a dirt-cleaning capacity comprise at least one of canna, monte sagittaria sagittifolia, celandine, turelia turgida, reed, calamus and arundo donax.
6. The ecological wetland sewage treatment system of claim 1, wherein the short evergreen water-tolerant plants comprise at least one of Yudai grass, Carex yeensis, Saururus chinensis, Alisma orientale, and Juglans regia.
7. The ecological wetland sewage treatment system of claim 1, wherein the thickness of the gravel layer is 5-10 cm, the thickness of the nano adsorption layer is 5-10 cm, and the thickness of the second soil layer is 15-20 cm.
8. The ecological wetland sewage treatment system of claim 1, wherein the evergreen water-tolerant plants comprise at least one of spider orchids, iris tectorum, and celandine.
9. A sewage treatment method is characterized by comprising the step of introducing rural sewage into the ecological wetland sewage treatment system according to any one of claims 1 to 8 for treatment.
10. The sewage treatment method according to claim 9, wherein the residence time of the sewage in the ecological ditch is 20-28 h, and the residence time in the impoundment well is 10-14 h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210033254.8A CN114349284A (en) | 2022-01-12 | 2022-01-12 | Ecological wetland sewage treatment system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210033254.8A CN114349284A (en) | 2022-01-12 | 2022-01-12 | Ecological wetland sewage treatment system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203065245U (en) * | 2013-02-19 | 2013-07-17 | 舟山佳宏水处理工程有限公司 | Ladder-shaped artificial wetland |
| CN104326566A (en) * | 2014-11-11 | 2015-02-04 | 仲恺农业工程学院 | Nano-filler purification device of vertical flow artificial wetland and proportioning method of nano-filler layer |
| CN109574233A (en) * | 2018-12-18 | 2019-04-05 | 北京工业大学 | A kind of artificial wet land system adding zeolite-loaded nano zero valence iron |
| CN112358053A (en) * | 2020-10-20 | 2021-02-12 | 沈阳大学 | Composite ecological treatment method for intercepting farmland drainage pollutants |
| US20210387881A1 (en) * | 2018-12-04 | 2021-12-16 | Zhejiang University | Rural landscape-type ecological ditch nitrogen and phosphorus interception system and method |
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2022
- 2022-01-12 CN CN202210033254.8A patent/CN114349284A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203065245U (en) * | 2013-02-19 | 2013-07-17 | 舟山佳宏水处理工程有限公司 | Ladder-shaped artificial wetland |
| CN104326566A (en) * | 2014-11-11 | 2015-02-04 | 仲恺农业工程学院 | Nano-filler purification device of vertical flow artificial wetland and proportioning method of nano-filler layer |
| US20210387881A1 (en) * | 2018-12-04 | 2021-12-16 | Zhejiang University | Rural landscape-type ecological ditch nitrogen and phosphorus interception system and method |
| CN109574233A (en) * | 2018-12-18 | 2019-04-05 | 北京工业大学 | A kind of artificial wet land system adding zeolite-loaded nano zero valence iron |
| CN112358053A (en) * | 2020-10-20 | 2021-02-12 | 沈阳大学 | Composite ecological treatment method for intercepting farmland drainage pollutants |
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