CN111517470A - Anti-clogging efficient nitrogen and phosphorus removal constructed wetland substrate, constructed wetland and method - Google Patents
Anti-clogging efficient nitrogen and phosphorus removal constructed wetland substrate, constructed wetland and method Download PDFInfo
- Publication number
- CN111517470A CN111517470A CN202010352976.0A CN202010352976A CN111517470A CN 111517470 A CN111517470 A CN 111517470A CN 202010352976 A CN202010352976 A CN 202010352976A CN 111517470 A CN111517470 A CN 111517470A
- Authority
- CN
- China
- Prior art keywords
- filter material
- layer
- material layer
- wetland
- artificial wetland
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- 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
-
- 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
- C02F2101/105—Phosphorus 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
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Microbiology (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Biodiversity & Conservation Biology (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses an anti-clogging efficient nitrogen and phosphorus removal constructed wetland substrate, an artificial wetland and a method. The substrate of the invention is respectively a drainage layer, a transition layer, a filter material layer and a covering layer from bottom to top; the drainage layer comprises gravels with the diameter of 16-32 mm; the transition layer comprises gravels with the diameter of 8-16 mm; the filter material layer comprises a first filter material layer and a second filter material layer positioned on the upper layer of the first filter material layer, the first filter material layer comprises zeolite and limestone, and the second filter material layer comprises biochar; the cover layer comprises 8-16mm gravel. The invention can help to adjust the porosity of the whole matrix by selecting components such as gravel, zeolite, limestone, biochar and the like and selecting different particle size ranges, is favorable for preventing the matrix from being blocked while meeting the hydraulic retention time, and improves the operation period of the wetland by combining the particle size ratio of the matrix, the laying method, the laying sequence and the like, thereby achieving the effect of preventing the matrix of the wetland from being blocked and achieving the effect of strengthening denitrification and dephosphorization.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to an anti-clogging efficient nitrogen and phosphorus removal constructed wetland substrate, an artificial wetland and a method.
Background
The secondary biochemical tail water of the urban sewage treatment plant has the characteristics of large water quantity, relatively high nitrogen and phosphorus concentration and the like, and is easy to cause surface water pollution and eutrophication of a receiving water body by direct discharge. As a novel sewage treatment technology, the constructed wetland can utilize the physical, chemical and biological coordination of a matrix-microorganism-plant composite ecosystem, thereby realizing the high-efficiency removal of nitrogen and phosphorus in sewage.
The substrate is one of the main parts of the artificial wetland, not only provides an attachment carrier for the growth of wetland plants and microorganisms, but also plays an important role in removing pollutants such as nitrogen, phosphorus and the like in sewage, and is a main factor directly related to the purification efficiency of the nitrogen and phosphorus. The purification function of the artificial wetland substrate is mainly expressed in the adsorption and ion exchange functions of the substrate; providing a place for the biochemical reaction of nitrogen; filtering and retaining the matrix, and removing organic and inorganic colloids in the pollutants by the matrix through absorption, complexation, precipitation and other effects; degrading the pollutant by the microbe growing in the substrate. Therefore, the artificial wetland substrate has the characteristics of large specific surface area, strong adsorption capacity, stable chemical property, cheap raw materials, easy obtainment and the like.
The traditional artificial wetland matrix mainly comprises soil, sand, gravel and the like. In recent years, researchers are actively researching and popularizing new, cheap and efficient artificial wetland substrate materials such as zeolite, fly ash, peat, bentonite, ceramsite, shale bauxite and the like on the basis of traditional wetland substrate materials. Different matrix materials have different removal effects on different pollutants, so that on one hand, the traditional matrix material has poor removal effect on nitrogen and phosphorus target pollutants in sewage and is easy to cause wetland blockage; on the other hand, the use of a single substrate has limited effect and higher cost. In addition, the operation period of the artificial wetland is important relevant to the denitrification and dephosphorization effects, and the reasonable filler gradation can effectively avoid the substrate blockage, thereby improving the operation efficiency and period of the wetland.
At present, the artificial wetland sewage treatment technology has wide application prospect in the aspects of nitrogen and phosphorus removal, but more traditional and single wetland substrates are used in the selection of fillers, and the expected treatment effect on nitrogen and phosphorus removal is difficult to achieve.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the characteristic of overhigh nitrogen and phosphorus nutrient salts of sewage to be treated, the invention provides an anti-clogging high-efficiency nitrogen and phosphorus removal constructed wetland substrate. The invention also provides an artificial wetland consisting of the substrate and a method for treating sewage by using the artificial wetland.
The technical scheme is as follows: the anti-clogging efficient nitrogen and phosphorus removal constructed wetland substrate is provided with a drainage layer, a transition layer, a filter material layer and a covering layer from bottom to top; the drainage layer comprises gravels with the diameter of 16-32 mm; the transition layer comprises gravels with the diameter of 8-16 mm; the filter material layer comprises a first filter material layer and a second filter material layer positioned on the upper layer of the first filter material layer, the first filter material layer comprises zeolite and limestone, and the second filter material layer comprises biochar; the cover layer comprises 8-16mm gravel.
Preferably, the thickness of the drainage layer is 95-105mm, the thickness of the transition layer is 95-105mm, the thickness of the filter material layer is 695-705mm, and the thickness of the covering layer is 145-155 mm.
Preferably, the thickness of the drainage layer is 100mm, the thickness of the transition layer is 100mm, the thickness of the filter material layer is 700mm, and the thickness of the covering layer is 150 mm.
Preferably, the thickness of the first filter material layer is 400mm, and the thickness of the second filter material layer is 300 mm.
Preferably, the volume ratio of the zeolite to the limestone in the first filter material layer is 1: 1.
Preferably, the particle size of the zeolite and limestone in the filter material layer is 5-15 mm.
Preferably, the particle size of the biochar is 5-15 mm.
The artificial wetland is prepared by utilizing the anti-clogging efficient nitrogen and phosphorus removal artificial wetland substrate.
The invention relates to a sewage treatment method by utilizing the artificial wetland, which comprises the following steps:
(a) paving a drainage layer which mainly comprises gravels with the grain diameter of 16-32mm on a water collecting system at the bottom of the artificial wetland;
(b) laying a transition layer which takes gravels with the grain diameter of 8-16mm as the main material on the drainage layer of the artificial wetland;
(c) laying a filter material layer which takes limestone, zeolite and biochar with the grain diameter of 5-15mm as main materials on the artificial wetland transition layer;
(d) laying a covering layer which takes gravels with the grain diameter of 8-16mm as the main part on the artificial wetland filter material layer;
(e) and operating the artificial wetland to perform sewage treatment, enabling the sewage to be treated to flow into the artificial wetland from the upper layer of the artificial wetland, and collecting the water treated by the artificial wetland through a water collecting layer arranged at the lower layer of the artificial wetland.
Has the advantages that: (1) according to the invention, the porosity and the particle diameter ratio of the substrate are screened, and various substrates are reasonably selected and matched, so that the nitrogen and phosphorus removal effects of the substrate are improved, and the substrate can stably run for a long time; (2) the substrate of the invention adopts zeolite as the component of the filter material layer, the zeolite is an aqueous alkali or alkaline earth metal aluminosilicate mineral, has a framework structure and contains a plurality of cavities, thereby having larger specific surface area and being capable of removing nitrogen and phosphorus pollutants in sewage through ion exchange. Particularly, the treatment efficiency for removing ammonia nitrogen in the sewage is high; (3) the limestone component is used in the filter material layer, and the limestone has irregular shape and higher permeability coefficient, so that gaps are easily formed among particles during stacking and the attachment and growth of microorganisms are facilitated. The main component of the material is CaCO3High calcium content, good effect of removing phosphorus in sewage, and synergistic effect of limestone and zeoliteWhen the zeolite and the limestone are used together, the insoluble phosphorus can be effectively removed, and particularly in the artificial wetland, the zeolite and the limestone promote the removal of the insoluble phosphorus and provide phosphorus for the growth of plants; (4) according to the invention, the biochar is used in the filter material layer, so that on one hand, the biochar is beneficial to adsorbing pollutants on the artificial wetland and has a good effect of removing nitrogen and phosphorus, on the other hand, the biochar is beneficial to the attachment of a biological membrane and the biodegradation of pollutants, and also can provide a certain carbon source for the artificial wetland and promote the denitrification effect of organisms; (5) the invention can effectively remove ammonia nitrogen by the combination of the gravel, the biochar and the fly ash ceramsite; (6) the invention adopts various materials and the matrix, ensures higher porosity and permeability of the matrix by matching different particle sizes, and has certain effect on preventing the matrix from being blocked. Therefore, the application provides an anti-clogging constructed wetland substrate combination for enhancing nitrogen and phosphorus removal.
Drawings
Fig. 1 is a schematic structural view of the artificial wetland.
Detailed Description
Raw material source and property description
Biochar: the particle size is 5-15mm, the biochar selected in the embodiment is peach kernel as a raw material, the peach kernel is refined by the processes of carbonization, activation, overheating, steam catalysis and the like, and the biochar is fired into irregular particle biochar which is black in appearance and 0.5-0.8g/cm in density3。
Zeolite: the particle size is 5-15mm, and is natural clinoptilolite filter material, the appearance is white, and the density is about 0.9g/cm3It is aluminosilicate mineral, belongs to weak acid cation exchanger, and has ion exchange and adsorption capacity and great adsorption capacity through artificial introduction of active component.
Limestone: particle diameter of 5-15mm, calcium content of about 65%, gray appearance, and density of about 1.5g/cm3And uniform limestone blocks with particle size after screening.
Second, experimental results
Example 1: filter material selection
Selecting 5 filter materials of volcanic rock, zeolite, ceramsite, biochar and limestone to perform a static adsorption experiment on tail water at a discharge port of a sewage plant, respectively weighing 10g of different filter materials, adding the different filter materials into 5 beakers filled with 500mL of tail water to perform static adsorption for 12h, detecting each water quality index in the adsorbed water, and comparing the removal effects of the adsorbed water on total nitrogen, total phosphorus and ammonia nitrogen, wherein the results are shown in Table 1.
TABLE 1 Effect of different filter materials on the Sewage treatment Effect
As can be seen from the static adsorption test results in Table 1, the removal effect of the biochar, the zeolite, the limestone and the volcanic rock on the concentration of pollutants is good, the synergistic effect can be generated when the zeolite and the limestone filter materials are mixed for use, the removal effect on TN and TP can be improved, and the biochar, the zeolite and the limestone are selected as the wetland main matrix filter materials after comprehensive consideration and screening.
Example 2: the embodiment provides an artificial wetland substrate combination for effectively removing nitrogen and phosphorus, wherein the substrate combination comprises the following components: gravel, zeolite, limestone and biochar, which have a volume composition percentage of about: 33.33% of gravel, 19.05% of zeolite, 19.05% of limestone and 28.57% of biochar. Specifically, the artificial wetland matrix in this embodiment requires the following raw materials:
according to the volume ratio of the artificial wetland matrix in the embodiment, an artificial wetland test pool of 2.5m multiplied by 2m multiplied by 1.5m is built, and the matrix laying of the test pool is as follows in sequence from bottom to top:
the gravel with the grain diameter of 16-32mm is used as the drainage layer 1, the laying thickness is 100mm, and the using amount of the gravel is 0.5m3。
Gravel with the particle size of 8-16mm is used as a transition layer 2, the paving thickness is 100mm, and the using amount of the gravel is 0.5m3。
The filter material layer consists of a first filter material layer 3 and a second filter material layer 4 positioned above the first filter material layer 3, wherein the zeolite with the grain diameter of 5-15mm and the limestone of the first filter material layer 3 are uniformly mixed to be used as one of the filter material layers, the laying thickness is 400mm, and the dosage of the zeolite is 1m3The dosage of the limestone is 1m3(ii) a The composition of the second filter material layer 4 is: organisms with particle size of 5-15mmCharcoal is used as one of the filter material layers, the laying thickness is 300mm, and the consumption of the biochar is 1.5m3。
And (3) covering layer 5: gravel with the particle size of 8-16mm is used as a covering layer, the paving thickness is 150mm, and the using amount of the gravel is 0.75m3。
Example 3: the artificial wetland test tank is filled according to the mixture ratio of the matrix filler components of the artificial wetland in the embodiment 2 and is used for treating tail water discharged by a certain municipal sewage treatment plant, and the water inflow of the artificial wetland is 2m3And d, after the wetland stably runs for one week, the water quality indexes of inlet water and outlet water are respectively detected twice, and the treatment effect of the artificial wet wetland on nitrogen and phosphorus pollutants is shown in the table 2.
TABLE 2 treatment effect of constructed wetland on tail water
According to the distribution ratio of the matrix filler components in the constructed wetland in the example 2, compared with another constructed wetland in which a 100mm thick drainage layer 1 (particle size: 16-32mm) composed of gravels with the same thickness and particle size, a transition layer composed of 100mm thick crushed stones (particle size: 8-16mm), a first filter layer composed of 400mm thick volcanic rock, a second filter layer composed of 300mm thick ceramsite (particle size of volcanic rock and ceramsite is 5-15mm), and a covering layer composed of 150mm gravels (particle size: 8-16mm) are sequentially laid from bottom to top, the removal effect of nitrogen and phosphorus is shown in table 3.
Table 3 comparison of the wetland substrate of the present invention and the existing wetland substrate for sewage treatment
As can be seen from the results in table 3, the constructed wetland composed of the matrix in the invention is composed of a plurality of materials, and the higher porosity and permeability of the matrix are ensured by utilizing different particle size combinations, so that the blockage of the constructed wetland in operation can be prevented, and the insoluble phosphorus is effectively removed by the combination of limestone and zeolite through the selection of the matrix components, and the biomass has better removal effects on both ammonia nitrogen and phosphorus.
The constructed wetland of the invention has no blockage within 60 days of normal operation, which shows that the constructed wetland of the invention can stably operate for a long time, and the treatment efficiency of the sewage with the same water quality reaches about 81 percent of the initial treatment efficiency after the constructed wetland operates for 60 days.
The invention can help to adjust the porosity of the whole matrix by selecting components such as gravel, zeolite, limestone, biochar and the like and selecting different particle size ranges, is favorable for preventing the matrix from being blocked while meeting the hydraulic retention time, and improves the operation period of the wetland by combining the particle size ratio of the matrix, the laying method, the laying sequence and the like, thereby achieving the effect of preventing the matrix of the wetland from being blocked and achieving the effect of strengthening denitrification and dephosphorization.
Claims (9)
1. An anti-clogging efficient nitrogen and phosphorus removal constructed wetland substrate is characterized in that the substrate is respectively a drainage layer, a transition layer, a filter material layer and a covering layer from bottom to top; the drainage layer comprises gravels with the diameter of 16-32 mm; the transition layer comprises gravels with the diameter of 8-16 mm; the filter material layer comprises a first filter material layer and a second filter material layer positioned on the upper layer of the first filter material layer, the first filter material layer comprises zeolite and limestone, and the second filter material layer comprises biochar; the cover layer comprises 8-16mm gravel.
2. The anti-clogging efficient denitrification and dephosphorization constructed wetland substrate according to claim 1, wherein the thickness of the drainage layer is 95-105mm, the thickness of the transition layer is 95-105mm, the thickness of the filter material layer is 695-155 mm, and the thickness of the covering layer is 145-155 mm.
3. The anti-clogging efficient denitrification and dephosphorization constructed wetland substrate according to claim 2, wherein the thickness of the drainage layer is 100mm, the thickness of the transition layer is 100mm, the thickness of the filter material layer is 700mm, and the thickness of the covering layer is 150 mm.
4. The anti-clogging efficient denitrification and dephosphorization constructed wetland substrate according to claim 3, wherein the thickness of the first filter material layer is 400mm, and the thickness of the second filter material layer is 300 mm.
5. The anti-clogging efficient denitrification and dephosphorization constructed wetland substrate according to claim 1, wherein the volume ratio of the zeolite to the limestone in the first filter material layer is 1: 1.
6. The anti-clogging efficient denitrification and dephosphorization constructed wetland substrate according to claim 1, wherein the particle size of the zeolite and the limestone in the filter material layer is 5-15 mm.
7. The anti-clogging efficient denitrification and dephosphorization constructed wetland substrate according to claim 1, wherein the particle size of the biochar is 5-15 mm.
8. An artificial wetland comprising the anti-clogging high efficiency denitrification and dephosphorization artificial wetland substrate according to any one of claims 1 to 7.
9. A sewage treatment method using the artificial wetland according to claim 8, comprising the steps of:
(a) paving a drainage layer which mainly comprises gravels with the grain diameter of 16-32mm on a water collecting system at the bottom of the artificial wetland;
(b) laying a transition layer which takes gravels with the grain diameter of 8-16mm as the main material on the drainage layer of the artificial wetland;
(c) laying a filter material layer which takes limestone, zeolite and biochar with the grain diameter of 5-15mm as main materials on the artificial wetland transition layer;
(d) laying a covering layer which takes gravels with the grain diameter of 8-16mm as the main part on the artificial wetland filter material layer;
(e) and operating the artificial wetland to perform sewage treatment, enabling the sewage to be treated to flow into the artificial wetland from the upper layer of the artificial wetland, and collecting the water treated by the artificial wetland through a water collecting layer arranged at the lower layer of the artificial wetland.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010352976.0A CN111517470A (en) | 2020-04-29 | 2020-04-29 | Anti-clogging efficient nitrogen and phosphorus removal constructed wetland substrate, constructed wetland and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010352976.0A CN111517470A (en) | 2020-04-29 | 2020-04-29 | Anti-clogging efficient nitrogen and phosphorus removal constructed wetland substrate, constructed wetland and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111517470A true CN111517470A (en) | 2020-08-11 |
Family
ID=71903891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010352976.0A Pending CN111517470A (en) | 2020-04-29 | 2020-04-29 | Anti-clogging efficient nitrogen and phosphorus removal constructed wetland substrate, constructed wetland and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111517470A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112830583A (en) * | 2021-01-20 | 2021-05-25 | 杭州沁霖生态科技有限公司 | Anti-clogging enhanced nitrogen and phosphorus removal constructed wetland filter tank |
| CN113200607A (en) * | 2021-05-17 | 2021-08-03 | 合肥工业大学 | Substrate filler with stable nitrogen and phosphorus removal effect, substrate and artificial wetland |
| CN114405469A (en) * | 2022-01-25 | 2022-04-29 | 江苏金舵环境科技有限公司 | Sewage nitrogen and phosphorus removal filler and preparation method thereof |
| CN114933393A (en) * | 2022-05-24 | 2022-08-23 | 中电建华东勘测设计研究院(郑州)有限公司 | In-situ ecological restoration structure for surface water and underground water |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6319717B1 (en) * | 1998-07-24 | 2001-11-20 | Lacount Robert B. | Thermal acid base accounting in mine overburden |
| CN104016487A (en) * | 2014-06-04 | 2014-09-03 | 厦门国寿种猪开发有限公司 | Artificial wetland |
| CN105906063A (en) * | 2016-05-17 | 2016-08-31 | 亿利首建生态科技有限公司 | Artificial wetland system and method for treating wastewater containing nitrogen and phosphor with artificial wetland system |
| CN207567066U (en) * | 2017-11-15 | 2018-07-03 | 南京瑞迪建设科技有限公司 | Sewage disposal device based on catalytic oxidation combination complex media filtration system |
| CN109319932A (en) * | 2018-09-13 | 2019-02-12 | 中建水务环保有限公司 | A kind of Performance of Constructed Wetlands Substrates and artificial swamp laying method for Tailwater Depth processing |
-
2020
- 2020-04-29 CN CN202010352976.0A patent/CN111517470A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6319717B1 (en) * | 1998-07-24 | 2001-11-20 | Lacount Robert B. | Thermal acid base accounting in mine overburden |
| CN104016487A (en) * | 2014-06-04 | 2014-09-03 | 厦门国寿种猪开发有限公司 | Artificial wetland |
| CN105906063A (en) * | 2016-05-17 | 2016-08-31 | 亿利首建生态科技有限公司 | Artificial wetland system and method for treating wastewater containing nitrogen and phosphor with artificial wetland system |
| CN207567066U (en) * | 2017-11-15 | 2018-07-03 | 南京瑞迪建设科技有限公司 | Sewage disposal device based on catalytic oxidation combination complex media filtration system |
| CN109319932A (en) * | 2018-09-13 | 2019-02-12 | 中建水务环保有限公司 | A kind of Performance of Constructed Wetlands Substrates and artificial swamp laying method for Tailwater Depth processing |
Non-Patent Citations (3)
| Title |
|---|
| 宁夏回族自治区环境保护厅等: "《宁夏农村环境保护规划与技术》", 31 January 2014, 中国环境出版社 * |
| 张增志等: "《中国战略性新兴产业 新材料 环境工程材料》", 30 November 2018, 中国铁道出版社 * |
| 舒诗湖等: "《城乡一体化供水技术与管理》", 31 January 2019, 北京冶金工业出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112830583A (en) * | 2021-01-20 | 2021-05-25 | 杭州沁霖生态科技有限公司 | Anti-clogging enhanced nitrogen and phosphorus removal constructed wetland filter tank |
| CN113200607A (en) * | 2021-05-17 | 2021-08-03 | 合肥工业大学 | Substrate filler with stable nitrogen and phosphorus removal effect, substrate and artificial wetland |
| CN114405469A (en) * | 2022-01-25 | 2022-04-29 | 江苏金舵环境科技有限公司 | Sewage nitrogen and phosphorus removal filler and preparation method thereof |
| CN114933393A (en) * | 2022-05-24 | 2022-08-23 | 中电建华东勘测设计研究院(郑州)有限公司 | In-situ ecological restoration structure for surface water and underground water |
| CN114933393B (en) * | 2022-05-24 | 2024-04-30 | 中电建华东勘测设计研究院(郑州)有限公司 | In-situ ecological restoration structure for surface water and underground water |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wang et al. | Comprehensive evaluation of substrate materials for contaminants removal in constructed wetlands | |
| CN111517470A (en) | Anti-clogging efficient nitrogen and phosphorus removal constructed wetland substrate, constructed wetland and method | |
| US12012711B2 (en) | Ecological slope protection with efficient water purification function and ecological improvment method | |
| CN102266752B (en) | Method for preparing carbonizing absorption grains used for purifying water | |
| Yang et al. | Selection and optimization of the substrate in constructed wetland: A review | |
| Zhu et al. | Roles of vegetation, flow type and filled depth on livestock wastewater treatment through multi-level mineralized refuse-based constructed wetlands | |
| CN108083560A (en) | A kind of rural activity area basin water resources recycle pollutant catabolic gene method and apparatus | |
| CN102285740A (en) | Non-waste treatment method for garbage leachate | |
| CN109607801B (en) | Composite constructed wetland sewage treatment system for denitrification and dephosphorization | |
| Zhong et al. | How to select substrate for alleviating clogging in the subsurface flow constructed wetland? | |
| CN109574233A (en) | A kind of artificial wet land system adding zeolite-loaded nano zero valence iron | |
| CN1120131C (en) | Purifying treatment method for diffusion water of garbage burying ground | |
| CN113860497A (en) | Urban and municipal sewage nitrogen and phosphorus removal filler and preparation method thereof | |
| CN108975625B (en) | Constructed wetland system with nitrogen and phosphorus recovery function | |
| Nguyen et al. | Hybrid use of coal slag and calcined ferralsol as wetland substrate for improving phosphorus removal from wastewater | |
| CN108975626B (en) | Landscape water treatment facilities with nitrogen phosphorus recovery effect | |
| Fahim et al. | Structural and functional perspectives of carbon filter media in constructed wetlands for pollutants abatement from wastewater | |
| CN111203173A (en) | Phosphorus removal material based on collophanite tailings and preparation and application methods thereof | |
| CN110723809A (en) | Multistage treatment method suitable for river pollution in rural areas | |
| CN112744921A (en) | Enhanced nitrogen and phosphorus removal and resource recycling type constructed wetland system | |
| CN112897677A (en) | Biological detention pond of intensive nitrogen and phosphorus removal | |
| CN110963638A (en) | Efficient composite phosphorus removal type farmland tail water treatment system and preparation method thereof | |
| CN114275896B (en) | Percolation biochemical treatment system applied to denitrification of enhanced percolation system | |
| CN215946889U (en) | Enhanced nitrogen and phosphorus removal and resource recycling type constructed wetland system | |
| CN113387446A (en) | Landscape type multi-medium tail water treatment vertical subsurface flow constructed wetland |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200811 |
|
| RJ01 | Rejection of invention patent application after publication |