CN111908617A - Substrate filler for strengthening constructed wetland dephosphorization by utilizing wetland plant reinvigoration flowers and method - Google Patents
Substrate filler for strengthening constructed wetland dephosphorization by utilizing wetland plant reinvigoration flowers and method Download PDFInfo
- Publication number
- CN111908617A CN111908617A CN202010934746.5A CN202010934746A CN111908617A CN 111908617 A CN111908617 A CN 111908617A CN 202010934746 A CN202010934746 A CN 202010934746A CN 111908617 A CN111908617 A CN 111908617A
- Authority
- CN
- China
- Prior art keywords
- wetland
- flowers
- strengthening
- plant
- utilizing
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a substrate filler for strengthening constructed wetland dephosphorization by utilizing wetland plant reinvigoration flowers and a method, which comprises the following steps: 1) cutting the overground part of the wetland plant, treating the overground part into powder, and then placing the powder in an anaerobic high-temperature muffle furnace for carbonization treatment for 6 hours at the temperature of 200-; 2) placing the carbonized restitution pollen powder in a ferrous sulfate solution according to a solid-to-liquid ratio of 1:10 for soaking for 2 hours, washing the carbonized restitution pollen powder to be neutral by using deionized water, and drying to prepare a wetland matrix additive; 3) adding the wetland substrate additive prepared in the step 2) into the surface soil of the wetland substrate according to the mass fraction of 5%, and uniformly mixing. The substrate filler and the method for strengthening constructed wetland phosphorus removal by utilizing wetland plant re-forcing can effectively improve the phosphorus removal capability of the constructed wetland, simultaneously improve the recycling efficiency of the harvested wetland plants, save the operation cost of the wetland, reduce the secondary pollution of the plants, improve the operation effect of the wetland, and have the characteristics of simple process, low cost, environmental protection, high efficiency and the like.
Description
Technical Field
The invention relates to the field of water treatment, in particular to a substrate filler for strengthening constructed wetland dephosphorization by utilizing wetland plant reinvigoration flowers and a method.
Background
At present, the water pollution condition in China is serious, and particularly the problem of water eutrophication caused by high-phosphorus sewage such as the disordered discharge of rural domestic sewage, the excessive application of agricultural fertilizers, the discharge of livestock and poultry breeding wastewater and the like is very prominent. The artificial wetland technology has the characteristics of good decontamination effect, low construction and operation cost, simple and convenient operation and management, good landscape effect and the like, and can be widely applied to rural areas for treating the domestic sewage in villages and towns.
The artificial wetland treatment technology for planting plants is a novel process for removing phosphorus in sewage at present. The constructed wetland mainly comprises a water body, a substrate, plants, microorganisms and the like, wherein the plants are main components of the wetland, and the substrate is an important carrier of the wetland. The matrix filler has a large influence on the removal of phosphorus, and the wetland plants can absorb, store and utilize inorganic phosphorus in water in the growth process, so that the removal effect is achieved.
Although the existing wetland matrix filler has certain removal capacity on phosphorus in sewage, the existing wetland matrix filler has a certain adsorption saturation value and short service life; meanwhile, wetland plants absorb nutrients and do not reap after being used for self growth, so that withered and withered plants release phosphorus into the wetland again, and secondary pollution is caused.
Disclosure of Invention
The invention aims to solve the technical problems of limited phosphorus removal capacity, secondary pollution caused by the fact that plants release phosphorus into the wetland again and low utilization rate of plant resources, and aims to provide a method for strengthening the phosphorus removal of the artificial wetland by utilizing wetland plant re-forcing, which can effectively improve the phosphorus removal capacity of the artificial wetland, improve the recycling efficiency of the harvested wetland plants, save the operation cost of the wetland, reduce the secondary pollution of the plants, improve the operation effect of the wetland, and has the characteristics of simple process, low cost, environmental protection, high efficiency and the like.
The invention is realized by the following technical scheme:
the matrix filler for strengthening the phosphorus removal of the artificial wetland by utilizing the wetland plant resurrection flowers comprises surface soil, wherein the surface soil contains wetland matrix additives with the mass fraction of 5%, and the wetland matrix additives are prepared by carbonizing the wetland plant resurrection flowers.
The preparation method of the wetland substrate additive comprises the following steps: 1) cutting the overground part of the wetland plant, treating the overground part into powder, and then placing the powder in an anaerobic high-temperature muffle furnace for carbonization for 6 hours at the temperature of 200-400 ℃; 2) and (3) soaking the carbonized restitution pollen powder in a ferrous sulfate solution for 2 hours according to the solid-to-liquid ratio of 1:10, washing the carbonized restitution pollen powder to be neutral by using deionized water, and drying to obtain the wetland matrix additive.
The temperature of the carbonization treatment in the step 1) is 200 ℃.
The re-force of the cutting is a part which is more than 10cm away from the ground.
The method for strengthening the phosphorus removal of the artificial wetland by utilizing the retension of wetland plants is characterized in that the prepared wetland substrate additive is added into the surface soil of the wetland substrate according to the mass fraction of 5 percent and is uniformly mixed.
The wetland matrix comprises a surface layer, an upper layer, a middle layer and a lower layer which are sequentially arranged from top to bottom, plants are planted on the surface layer, the upper layer is a clay layer with the thickness of 20cm, the middle layer is a gravel packing layer with the thickness of 40cm and composed of gravel with the particle size of 5-8mm and fine sand, and the lower layer is a drainage layer with the thickness of 30cm and composed of gravel with the particle size of 15-30 mm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the substrate filler and the method for strengthening constructed wetland phosphorus removal by utilizing wetland plant re-forcing can effectively improve the phosphorus removal capability of the constructed wetland, simultaneously improve the recycling efficiency of the harvested wetland plants, save the operation cost of the wetland, reduce the secondary pollution of the plants, improve the operation effect of the wetland, and have the characteristics of simple process, low cost, environmental protection, high efficiency and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a graph showing the comparison of the phosphorus adsorption amount of the surface soil according to the present invention;
FIG. 2 is a graph showing the comparison of the phosphorus removal rate of the surface soil according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.
Example 1
The invention relates to a method for strengthening constructed wetland dephosphorization by utilizing wetland plant reinvigoration flowers, which comprises the following steps: 1) cutting the overground part of the wetland plant, treating the overground part into powder, and then placing the powder in an anaerobic high-temperature muffle furnace for carbonization treatment for 6 hours at the temperature of 200 ℃; 2) placing the carbonized restitution pollen powder in a ferrous sulfate solution according to a solid-to-liquid ratio of 1:10 for soaking for 2 hours, washing the carbonized restitution pollen powder to be neutral by using deionized water, and drying to prepare a wetland matrix additive; 3) adding the wetland substrate additive prepared in the step 2) into the surface soil of the wetland substrate according to the mass fraction of 5%, and uniformly mixing.
Example 2
The invention relates to a method for strengthening constructed wetland dephosphorization by utilizing wetland plant resurrection flowers, which comprises the following steps of 1) cutting the overground part of the wetland plant resurrection flowers, processing the overground part into powder, and placing the powder in an anaerobic high-temperature muffle furnace for carbonization treatment for 6 hours at the temperature of 300 ℃; 2) placing the carbonized restitution pollen powder in a ferrous sulfate solution according to a solid-to-liquid ratio of 1:10 for soaking for 2 hours, washing the carbonized restitution pollen powder to be neutral by using deionized water, and drying to prepare a wetland matrix additive; 3) adding the wetland substrate additive prepared in the step 2) into the surface soil of the wetland substrate according to the mass fraction of 5%, and uniformly mixing.
Example 3
The invention relates to a method for strengthening constructed wetland dephosphorization by utilizing wetland plant resurrection flowers, which comprises the following steps of 1) cutting the overground part of the wetland plant resurrection flowers, processing the overground part into powder, and placing the powder in an anaerobic high-temperature muffle furnace for carbonization treatment for 6 hours at the temperature of 400 ℃; 2) placing the carbonized restitution pollen powder in a ferrous sulfate solution according to a solid-to-liquid ratio of 1:10 for soaking for 2 hours, washing the carbonized restitution pollen powder to be neutral by using deionized water, and drying to prepare a wetland matrix additive; 3) adding the wetland substrate additive prepared in the step 2) into the surface soil of the wetland substrate according to the mass fraction of 5%, and uniformly mixing.
Comparative example
In the existing wetland treatment technology, a surface layer is covered by soil, an upper layer is a clay layer with the thickness of 20cm, a middle layer is a gravel packing layer with the thickness of 40cm and consists of gravels with the particle size of 5-8mm and fine sand, and a lower layer is a drainage layer with the thickness of 30cm and consists of gravels with the particle size of 15-30 mm. The comparative example differs from examples 1-3 in that the topsoil is not supplemented with the rehydrating floral wetland matrix additive of the invention.
Phosphorus removal performance tests were performed on the surface soil of examples 1 to 3 and comparative example, and the results were as follows:
when the total phosphorus concentration of the wetland inlet water is about 5mg/L (the fluctuation range is 4-6 mg/L), the hydraulic retention time is 7d, and the wetland continuous operation time is 1 month, the average removal rates of the example 1, the example 2, the example 3 and the comparative example on the total phosphorus of the inlet water are respectively 96.9%, 94.3%, 91.5% and 24.5%, and the treatment method of the embodiment of the invention is obviously superior to the comparative example in removing the phosphorus of the artificial wetland.
The experimental study of phosphorus adsorption on the surface soil of examples 1-3 and comparative example shows that the adsorption amount and phosphorus removal rate of the surface soil of each case under different initial phosphorus concentrations (fluctuation range is 1-40 mg/L) are shown in fig. 1 and fig. 2 when the ambient temperature is 25 ℃ and the adsorption time is 48 h.
As can be seen from FIG. 1, the phosphorus adsorption amounts of examples 1 to 3 are all larger than those of the comparative example, and particularly, the phosphorus adsorption amount of example 1 is significantly largest and the phosphorus adsorption effect is the best. When the concentration of phosphorus in the feed water is 40mg/L, the phosphorus adsorption capacity of example 1 can reach 3.08mg/g, the phosphorus adsorption capacity of examples 2 and 3 is respectively 0.69mg/g and 0.71mg/g, and the phosphorus adsorption capacity of the comparative example is only 0.21 mg/g.
As can be seen from fig. 2, the phosphorus removal rate of example 1 is significantly higher than that of comparative example, example 2 and example 3 under the condition of different phosphorus concentrations of inlet water, which shows that the carbonization treatment temperature of the regenerated flowers affects the performance of the regenerated flowers as wetland matrix additives. The phosphorus adsorption data of example 1 are fitted, and the result shows that example 1 can well satisfy the Langmuir isothermal adsorption equation, the maximum adsorption amount of phosphorus is 10.32mg/g, and is more than 10 times of the maximum adsorption amount of general soil (312.5-1000 mug/g is introduced from research on the adsorption effect of phosphorus on soil).
At a treatment capacity of 5000m3And d, calculating the reduction of the water quality of the artificial wetland from the water quality V type to the water quality IV type, and treating the sewage by taking the artificial wetland in the embodiment 1 as the artificial wetland, wherein the service life of the wetland can be expected to be prolonged by about 2 years by adding 100g of the wetland substrate additive.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The matrix filler for strengthening the phosphorus removal of the artificial wetland by utilizing the wetland plant reinvigorating flowers comprises surface soil and is characterized in that the surface soil contains wetland matrix additives with the mass fraction of 5%, and the wetland matrix additives are prepared by carbonizing the wetland plant reinvigorating flowers.
2. The substrate filler for strengthening constructed wetland phosphorus removal by utilizing wetland plant reinvigoration flowers according to claim 1, wherein the preparation method of the wetland substrate additive comprises the following steps: 1) cutting the overground part of the wetland plant, treating the overground part into powder, and then placing the powder in an anaerobic high-temperature muffle furnace for carbonization for 6 hours at the temperature of 200-400 ℃; 2) and (3) soaking the carbonized restitution pollen powder in a ferrous sulfate solution for 2 hours according to the solid-to-liquid ratio of 1:10, washing the carbonized restitution pollen powder to be neutral by using deionized water, and drying to obtain the wetland matrix additive.
3. The matrix filler for strengthening constructed wetland phosphorus removal by utilizing wetland plant reforesting flowers as claimed in claim 1, wherein the temperature of the carbonization treatment in step 1) is 200 ℃.
4. The method for enhancing phosphorus removal in artificial wetlands by utilizing wetland plant re-forcing flowers as claimed in claim 1, wherein the re-forcing flowers are cut at a distance of more than 10cm from the ground.
5. The method for strengthening constructed wetland phosphorus removal by utilizing wetland plant reforesting flowers is characterized in that the wetland substrate additive prepared in the claim 2 is added into the surface soil of the wetland substrate according to the mass fraction of 5% and is uniformly mixed.
6. The method for strengthening phosphorus removal by artificial wetland plants according to claim 5, wherein the wetland substrate comprises a surface layer, an upper layer, a middle layer and a lower layer which are arranged in sequence from top to bottom, plants are planted on the surface layer, the upper layer is a clay layer with the thickness of 20cm, the middle layer is a gravel packing layer with the thickness of 40cm and is composed of gravel with the particle size of 5-8mm and fine sand, and the lower layer is a drainage layer with the thickness of 30cm and is composed of gravel with the particle size of 15-30 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010934746.5A CN111908617A (en) | 2020-09-08 | 2020-09-08 | Substrate filler for strengthening constructed wetland dephosphorization by utilizing wetland plant reinvigoration flowers and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010934746.5A CN111908617A (en) | 2020-09-08 | 2020-09-08 | Substrate filler for strengthening constructed wetland dephosphorization by utilizing wetland plant reinvigoration flowers and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111908617A true CN111908617A (en) | 2020-11-10 |
Family
ID=73266304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010934746.5A Pending CN111908617A (en) | 2020-09-08 | 2020-09-08 | Substrate filler for strengthening constructed wetland dephosphorization by utilizing wetland plant reinvigoration flowers and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111908617A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115518611A (en) * | 2022-10-17 | 2022-12-27 | 北京中岩大地环境科技有限公司 | Preparation method and application of magnetic ferrozirconium modified sepiolite artificial wetland matrix |
| CN116393112A (en) * | 2023-03-10 | 2023-07-07 | 山东科技大学 | Preparation method of iron-carbon particles and reinforced constructed wetland dephosphorization method based on iron-carbon particles |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011005064A2 (en) * | 2009-07-10 | 2011-01-13 | Lee Sung Hee | Method and system for creating cohabitation environment for both animals and plants for the concurrent recovery of basic environment |
| CN102992319A (en) * | 2012-12-05 | 2013-03-27 | 浙江大学 | Efficient and safe preparation method for active carbon material for adsorbing phosphorus in water body |
| CN203440221U (en) * | 2013-07-05 | 2014-02-19 | 中国建筑股份有限公司 | Artificial wetland system for sludge drying and stabilizing treatment |
| CN104150601A (en) * | 2014-08-19 | 2014-11-19 | 扬州大学 | Percolation system having radial flow pollutant removal efficacy of road ecological filter trench |
| CN104628137A (en) * | 2014-12-29 | 2015-05-20 | 南京大学 | Method for treating phosphatic sewage by coupling modified biomass charcoal and artificial wetland |
| CN105854805A (en) * | 2016-05-31 | 2016-08-17 | 浙江大学 | Modified charcoal microballoon, and preparation method and application thereof |
| CN106966547A (en) * | 2017-04-25 | 2017-07-21 | 常州大学 | A kind of rural domestic sewage treating device of hypsography larger area |
| CN107892441A (en) * | 2017-12-13 | 2018-04-10 | 中国科学院地理科学与资源研究所 | Metal mine water resource recycles middle pollutant catabolic gene device and control method |
| CN108178321A (en) * | 2018-01-19 | 2018-06-19 | 杭州绿风生态环境建设集团有限公司 | A kind of water remediation method for making ecological floating island matrix using biomass carbon |
| CN209081531U (en) * | 2018-10-15 | 2019-07-09 | 元成环境股份有限公司 | A kind of net dirty system of sponge urban rainwater wetland |
| CN110508600A (en) * | 2019-07-23 | 2019-11-29 | 同济大学 | A kind of soil base modification method and shore bank is promoted to expand numerous ecological construction method with plant fixing |
| CN110921836A (en) * | 2019-11-29 | 2020-03-27 | 中国中元国际工程有限公司 | Efficient phosphorus removal and anti-blocking engineering wetland system and method based on plant and microorganism purification mode |
| CN211141659U (en) * | 2019-11-28 | 2020-07-31 | 云南大学 | Ecological wetland system integrating mine wastewater treatment and plant residue treatment |
-
2020
- 2020-09-08 CN CN202010934746.5A patent/CN111908617A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011005064A2 (en) * | 2009-07-10 | 2011-01-13 | Lee Sung Hee | Method and system for creating cohabitation environment for both animals and plants for the concurrent recovery of basic environment |
| CN102992319A (en) * | 2012-12-05 | 2013-03-27 | 浙江大学 | Efficient and safe preparation method for active carbon material for adsorbing phosphorus in water body |
| CN203440221U (en) * | 2013-07-05 | 2014-02-19 | 中国建筑股份有限公司 | Artificial wetland system for sludge drying and stabilizing treatment |
| CN104150601A (en) * | 2014-08-19 | 2014-11-19 | 扬州大学 | Percolation system having radial flow pollutant removal efficacy of road ecological filter trench |
| CN104628137A (en) * | 2014-12-29 | 2015-05-20 | 南京大学 | Method for treating phosphatic sewage by coupling modified biomass charcoal and artificial wetland |
| CN105854805A (en) * | 2016-05-31 | 2016-08-17 | 浙江大学 | Modified charcoal microballoon, and preparation method and application thereof |
| CN106966547A (en) * | 2017-04-25 | 2017-07-21 | 常州大学 | A kind of rural domestic sewage treating device of hypsography larger area |
| CN107892441A (en) * | 2017-12-13 | 2018-04-10 | 中国科学院地理科学与资源研究所 | Metal mine water resource recycles middle pollutant catabolic gene device and control method |
| CN108178321A (en) * | 2018-01-19 | 2018-06-19 | 杭州绿风生态环境建设集团有限公司 | A kind of water remediation method for making ecological floating island matrix using biomass carbon |
| CN209081531U (en) * | 2018-10-15 | 2019-07-09 | 元成环境股份有限公司 | A kind of net dirty system of sponge urban rainwater wetland |
| CN110508600A (en) * | 2019-07-23 | 2019-11-29 | 同济大学 | A kind of soil base modification method and shore bank is promoted to expand numerous ecological construction method with plant fixing |
| CN211141659U (en) * | 2019-11-28 | 2020-07-31 | 云南大学 | Ecological wetland system integrating mine wastewater treatment and plant residue treatment |
| CN110921836A (en) * | 2019-11-29 | 2020-03-27 | 中国中元国际工程有限公司 | Efficient phosphorus removal and anti-blocking engineering wetland system and method based on plant and microorganism purification mode |
Non-Patent Citations (4)
| Title |
|---|
| LIWEI XIAO等: "Adsorption of phosphorus onto Fe-modified Thalia dealbata-derived biochar", 《E3S WEB OF CONFERENCES ICAEER 2019》 * |
| 宋关玲等: "《北方富营养化水体生态修复技术》", 31 July 2015, 中国轻工业出版社 * |
| 聂发辉等: "不同结构生态浅层渗滤系统净化路面径流的效果与机理", 《给水排水》 * |
| 黄章富等: "《广东省农村环境综合整治技术指引》", 31 October 2016, 中山大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115518611A (en) * | 2022-10-17 | 2022-12-27 | 北京中岩大地环境科技有限公司 | Preparation method and application of magnetic ferrozirconium modified sepiolite artificial wetland matrix |
| CN116393112A (en) * | 2023-03-10 | 2023-07-07 | 山东科技大学 | Preparation method of iron-carbon particles and reinforced constructed wetland dephosphorization method based on iron-carbon particles |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105908693B (en) | The planting carpet improved for muddy coast salt-soda soil original soil | |
| CN105638301A (en) | Seedling culturing matrix with straw fermentation matter as main raw material and preparation method of seedling culturing matrix | |
| CN106006978B (en) | The substrate improved materials and preparation method and restorative procedure of a kind of high organic bed mud shallow lake | |
| CN111908617A (en) | Substrate filler for strengthening constructed wetland dephosphorization by utilizing wetland plant reinvigoration flowers and method | |
| CN104496630A (en) | Fertilizer special for paddy rice and preparation method thereof | |
| CN101514053A (en) | Eutrophication water body artificial wetland processing system taking steel-making waste residue as a substrate | |
| CN106701095A (en) | Soil conditioner and application thereof in desertification control | |
| CN101828512B (en) | Method of using lake sediment and coal slag as compost | |
| CN113861991B (en) | Building residue soil modifier prepared from kitchen waste, preparation method and application of building residue soil modifier | |
| CN110508600A (en) | A kind of soil base modification method and shore bank is promoted to expand numerous ecological construction method with plant fixing | |
| CN106171764A (en) | A kind of collection rain water conservation method of forestation of drought mountain bare-root seeding | |
| CN108975513A (en) | A kind of crop type artificial wet field facilities for treating sewage | |
| CN102860224B (en) | Root system induction method of woody plants in subsurface flow constructed wetland environment | |
| CN112470863A (en) | Formula of light trampling-resistant roof substrate prepared from crop straws | |
| CN210445149U (en) | Straw biochar-based vegetable pot cultivation system | |
| CN103013531A (en) | Biomass sandy soil improving agent | |
| CN103936517A (en) | Special greening matrix for saline-alkali soil and preparation method thereof | |
| CN215530519U (en) | Sponge soil structure with strong water retention and water storage performance | |
| CN110291911A (en) | A method of utilizing kitchen waste oil prevention soil and water loss | |
| CN114532180A (en) | Building waste conversion substrate for roof greening of sedum lineare and application thereof | |
| CN113526676A (en) | Artificial wetland system capable of enhancing denitrification | |
| CN112119865A (en) | Radix ophiopogonis cultivation medium suitable for slope greening | |
| CN110791293A (en) | Rice field heavy metal cadmium passivator and preparation method thereof | |
| CN116746454B (en) | Artificial simulation soil for floating city and preparation method | |
| CN113185983B (en) | Soil conditioner and preparation method and application thereof |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201110 |