CN115299319A - Green roof improvement matrix layer and preparation method thereof - Google Patents
Green roof improvement matrix layer and preparation method thereof Download PDFInfo
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- CN115299319A CN115299319A CN202210959872.5A CN202210959872A CN115299319A CN 115299319 A CN115299319 A CN 115299319A CN 202210959872 A CN202210959872 A CN 202210959872A CN 115299319 A CN115299319 A CN 115299319A
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- 239000011159 matrix material Substances 0.000 title claims abstract description 86
- 230000006872 improvement Effects 0.000 title claims description 8
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- 229910052902 vermiculite Inorganic materials 0.000 claims abstract description 30
- 239000003415 peat Substances 0.000 claims abstract description 29
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 5
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- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 5
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims abstract description 5
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims abstract description 5
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims abstract description 5
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229920000609 methyl cellulose Polymers 0.000 claims abstract description 5
- 239000001923 methylcellulose Substances 0.000 claims abstract description 5
- 235000010981 methylcellulose Nutrition 0.000 claims abstract description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 5
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims abstract description 5
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 5
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 claims abstract description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 28
- 229910052757 nitrogen Inorganic materials 0.000 description 14
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 13
- 229910052698 phosphorus Inorganic materials 0.000 description 13
- 239000011574 phosphorus Substances 0.000 description 13
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 11
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- 238000009472 formulation Methods 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
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- 230000014759 maintenance of location Effects 0.000 description 5
- 239000003337 fertilizer Substances 0.000 description 4
- 230000012010 growth Effects 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 3
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- 238000002798 spectrophotometry method Methods 0.000 description 3
- 235000013311 vegetables Nutrition 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008635 plant growth Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 241000189144 Sedum lineare Species 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 description 1
- 229940010552 ammonium molybdate Drugs 0.000 description 1
- 235000018660 ammonium molybdate Nutrition 0.000 description 1
- 239000011609 ammonium molybdate Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
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- 239000002861 polymer material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/20—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
- A01G24/28—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material containing peat, moss or sphagnum
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
- A01G24/12—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material containing soil minerals
- A01G24/15—Calcined rock, e.g. perlite, vermiculite or clay aggregates
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/30—Growth substrates; Culture media; Apparatus or methods therefor based on or containing synthetic organic compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Soil Sciences (AREA)
- Cultivation Of Plants (AREA)
Abstract
The invention discloses a green roof improving matrix layer and a preparation method thereof, wherein the improving matrix layer is prepared from peat soil, expanded vermiculite and modifying agent according to the volume ratio of 15% -20%:79% -82%: 1-3 percent of modifier, and the modifier is one or a mixture of more than two of polyaluminium chloride, polyferric sulfate, polyvinyl alcohol, methylcellulose, sodium carboxymethylcellulose and hydroxypropyl methylcellulose. The improved matrix layer is prepared by stirring and drying the components with water and repeating the dry-wet cycle for 3-5 times. The peat soil and the expanded vermiculite in the matrix layer are improved, the regulation and control of the matrix layer on the water quantity and the water quality of rainwater runoff are facilitated, the bridging bonding effect of the modifying agent on matrix particles is utilized, the operation of dry-wet circulation is combined, the formation of a cluster structure in the matrix layer is accelerated, a water guide channel is formed to relieve the leaching effect of the green roof matrix layer in the rainfall process, and the utilization rate of nutrient elements is further improved.
Description
Technical Field
The invention relates to the technical field of sponge city construction, in particular to a green roof improvement matrix layer and a preparation method thereof.
Background
The green roof is one of important measures of sponge cities, and can effectively relieve the problems of urban inland inundation and surface source pollution which need to be solved urgently at present. The main structure of the green roof can be divided into a vegetable layer, a matrix layer, a filter layer, a drainage layer and a waterproof layer from top to bottom. The matrix layer is one of the key factors influencing the rainwater runoff storage and sewage interception benefits of the green roof. The substrate layer not only plays a role in regulating and controlling rainwater runoff and water quality, but also meets the nutritional requirement of growth of upper vegetation, so that part of nutrient-rich substrate materials are often added into the substrate layer. However, the substrate layer is washed by rainwater runoff in the rainfall process, the leaching effect occurs on the substrate layer, and runoff carries a large amount of nitrogen and phosphorus pollutants to enter a receiving water body, so that the non-point source pollution phenomenon is aggravated.
In order to solve the above problems, the leaching loss effect of the matrix layer is usually relieved by the design of the matrix layer structure and/or the improvement of the material, for example, patent CN105993569A discloses a double-matrix layer extended green roof, wherein the matrix layer is composed of an upper nutrient matrix layer and a lower adsorption matrix layer, the nutrient matrix layer prepared from garden soil and slow release fertilizer meets the growth requirement of the plant, the adsorption matrix layer prepared from vermiculite, perlite, pumice or active carbon is used for water and fertilizer retention, the matrix layer is structurally designed according to the functional requirement, the method is relatively complicated and the space utilization rate is not high; in addition, modifying agents such as biochar or activated carbon are applied to a substrate layer containing a nutrient substrate to adjust the physicochemical properties of the substrate layer, improve the water holding capacity of the substrate layer and reduce the runoff erosion risk, so that the method is a feasible and effective method for relieving the leaching effect of the substrate layer, but the use of the modifying agents such as biochar and activated carbon has the defects of high cost and low efficiency, for example, a substrate layer (Zhang, q.q., miao, l.p., et al.environ monitor Assess (2019) 191). Therefore, an improved matrix layer with low cost and simple construction method is urgently needed in the field to meet the growth requirement of vegetation, and simultaneously, the problem that nutrient elements in the existing green roof matrix layer are easy to lose in the rainfall process can be effectively relieved.
Disclosure of Invention
The invention aims to provide a green roof improving matrix layer and a preparation method thereof, the improved matrix layer has simple structure and components, meets the nutritional requirements of vegetation, and can effectively relieve the leaching loss effect of nutritional elements in the matrix layer in the rainfall process.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a green roof improvement matrix layer, which is prepared from peat soil, expanded vermiculite and a modifier according to a volume ratio of 15% -20%:79% -82%: 1-3 percent of modifier, and the modifier is one or more of polyaluminium chloride, polyferric sulfate, polyvinyl alcohol, methylcellulose, sodium carboxymethylcellulose and hydroxypropyl methylcellulose.
The peat soil is used as a nutrient substrate, is rich in nitrogen and phosphorus nutrient elements required by vegetation growth, and has high cation exchange capacity, water absorption and water retention performance; the expanded vermiculite is used as an adsorption matrix and has the characteristics of light volume weight, large retention capacity, strong ion exchange capacity and the like; the use of the peat soil and the expanded vermiculite is beneficial to improving the water quantity and quality regulation and control effect of the matrix layer on the rainwater runoff, and meanwhile, the peat soil and the expanded vermiculite have a certain adsorption and interception effect on elements such as nitrogen, phosphorus and the like in the rainwater; but the mass ratio of the peat soil to the expanded vermiculite in the matrix layer needs to be controlled, so that the phenomenon that the adsorption and retention capacity of the matrix layer is reduced due to the fact that the peat soil content is too high and the expanded vermiculite content is relatively reduced is avoided, and the leaching risk is increased.
Further, the particle size of the peat soil in the improved matrix layer is less than 2mm.
Further, the particle size of the expanded vermiculite in the modified substrate layer is less than 4mm.
The particle sizes of the peat soil and the expanded vermiculite in the improved matrix layer are controlled not to be too large, so that the contact area between the matrix particles and the modifying agent is large enough to enhance the bridging bonding effect of the modifying agent on the matrix particles and accelerate the formation of a granular structure.
Polyaluminum chloride, polyferric sulfate, polyvinyl alcohol, methylcellulose, sodium carboxymethylcellulose and hydroxypropyl methylcellulose are used as matrix layer modifiers, and all belong to high-molecular polymer materials. Wherein, the polyaluminum chloride and the polyferric sulfate are common water treatment flocculants and can bridge matrix particles to form stable aggregates through high-degree electric neutralization and adsorption bridging. The polyvinyl alcohol, the methyl cellulose, the sodium carboxymethyl cellulose and the hydroxypropyl methyl cellulose have long main chains, multi-branched side chain structures and a large number of hydrophilic active groups, and can strengthen the water film bonding force among matrix particles through the physicochemical actions of hydrogen bonds, chemical bonds, van der waals force and the like.
Further, the volume ratio of the modifying agent in the modified matrix layer is preferably 1.5-2.5%; if the application ratio of the modifying agent in the modified matrix layer is too high, the modifying agent is not easy to diffuse among matrix particles, and a thin film is formed on the surfaces of matrix aggregates. The film on the surface of the granules influences the infiltration process of the runoff in the water conducting channel, thereby increasing the possibility of erosion.
Further, the volume weight of the improved substrate layer is 240.32-260.32kg/m 3 。
Further, the thickness of the modified substrate layer on the green roof is 10-20cm.
In a second aspect of the present invention, there is provided a method for preparing the green roof improving matrix layer of the first aspect, comprising the steps of:
(1) Sieving the crushed peat soil and the expanded vermiculite respectively, and drying after sieving;
(2) Mixing the dried peat soil, the expanded vermiculite and the modifying agent according to the mass ratio;
(3) Adding water into the mixture, stirring uniformly, and then drying;
(4) And (4) repeating the dry-wet cycle treatment in the step (3) for 3-5 times to obtain the improved matrix layer.
Further, in the step (1), the temperature of the drying treatment is 95-105 ℃, and the time is 12-24h.
Further, in the step (3), the volume of the added water is 30-50% of the volume of the mixture; the amount of water added is about the saturated water absorption of the modified matrix layer, so that the matrix particles in the mixture can absorb sufficient water to swell.
Further, in the step (3), the drying treatment temperature is 45-55 ℃ and the time is 12-24h.
Through adding water, stirring and multiple dry-wet cycle treatments, the matrix particles in the mixture generate frequent water absorption expansion and contraction phenomena in a short period, the bridging bonding effect of the modifier on the matrix particles is strengthened, the water guide pores in the matrix layer are enlarged, and the nutrient leaching loss phenomenon of the matrix layer in the rainfall process is relieved.
The invention has the beneficial effects that:
1. the invention provides a formula of a green roof improvement matrix layer, which utilizes the bridging bonding effect of a modifier on peat soil and expanded vermiculite and combines a mixing method of dry-wet circulation to accelerate the formation of a cluster structure in the matrix layer, form a preferential water guide channel in the matrix layer and weaken the scouring effect of runoff on the matrix layer. Compared with a substrate layer without the modifier, the modified substrate layer prepared by the invention greatly reduces the leaching risk of the nutrient elements in the substrate layer, so that the nutrient elements in the substrate layer can be fully utilized by vegetation, and the influence of runoff pollutants on the effluent quality is reduced.
2. Compared with the prior art, the modifier used for the improved matrix layer has low cost and simple preparation method, and is suitable for large-batch mass production; in addition, the improved matrix layer can provide a large number of nutrient elements required by plant growth, can directly plant vegetation, is high in space utilization rate, has good water and fertilizer retention effects due to the interaction of all components in the improved matrix layer, and meets the requirements of a green roof matrix layer.
Detailed Description
The following specific examples are provided to further illustrate the invention so that those skilled in the art may better understand the invention and practice it, but the examples are not intended to limit the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The volume weight of the peat soil used in the following examples and comparative examples was 584kg/m 3 The volume weight of the vermiculite is 186kg/m 3 (ii) a The modifier is polyaluminium chloride with the content of aluminium oxide of 28 percent.
Example 1
This example prepares a green roof improving matrix layer, which specifically includes the following steps:
(1) Respectively sieving the crushed peat soil and the expanded vermiculite to obtain peat soil with the particle size of 0-2mm and expanded vermiculite with the particle size of 2-4mm, and then placing the sieved peat soil and expanded vermiculite in a drying oven at the temperature of about 100 ℃ for drying for 16 hours;
(2) Mixing the dried peat soil, the expanded vermiculite and the polyaluminium chloride according to a volume ratio of 19.9:79.6:0.5 mixing;
(3) Adding deionized water which is 30 percent of the total volume of the mixture into the mixture obtained in the step (2), and stirring uniformly;
(4) And (3) drying the stirred mixture in an oven at about 50 ℃ for 12h, taking out after drying, uniformly spraying 30% deionized water with the total volume on the surface of the mixture, and repeating the dry-wet cycle treatment for 3 times to obtain the improved matrix layer.
Example 2
The preparation method of the green roof modified substrate layer of this example is the same as that of example 1, and only the formulation is different, and the volume ratio of peat soil, expanded vermiculite and polyaluminium chloride in the modified substrate layer of this example is 19.8:79.2:1.0.
example 3
The preparation method of the green roof modified substrate layer of this example is the same as that of example 1, and only the formulation is different, and the volume ratio of peat soil, expanded vermiculite and polyaluminium chloride in the modified substrate layer of this example is 19.7:78.8:1.5.
example 4
The preparation method of the green roof modified substrate layer of this example is the same as that of example 1, and only the formulation is different, and the volume ratio of peat soil, expanded vermiculite and polyaluminium chloride in the modified substrate layer of this example is 19.6:78.4:2.0.
example 5
The preparation method of the green roof modified substrate layer of this example is the same as that of example 1, and only the formulation is different, and the volume ratio of peat soil, expanded vermiculite and polyaluminium chloride in the modified substrate layer of this example is 19.5:78:2.5.
comparative example 1
The preparation method of the matrix layer of the comparative example is the same as the above examples, and only the formulation is different, and the volume ratio of the peat soil to the expanded vermiculite in the matrix layer of the comparative example is 2.
Comparative example 2
The preparation method of the matrix layer of the comparative example is the same as that of the above example, and only the formulation is different, and the volume ratio of the peat soil to the expanded vermiculite in the matrix layer of the comparative example is 2.5.
Leaching loss test
The following green roof bench test set-up was constructed using the matrix layers prepared in the above examples and comparative examples, respectively: sequentially arranging a vegetable layer, a matrix layer, a filter layer and a drainage layer from top to bottom; wherein the planting density of the vegetable layer is 400 plants/m 2 The filter layer of the sedum lineare is 250g/m 3 The non-woven geotextile adopts a high-density polyethylene drainage plate with the thickness of 3cm as a drainage layer.
Simulating rainfall: the peristaltic pump is used for simulating rainfall on a green roof small test device, and the rainfall accommodation area of the device is 0.047m 2 . The depth of simulated rainfall is 49.33mm, and the concentrations of nitrate nitrogen, total nitrogen and total phosphorus in the simulated rainfall rainwater are respectively 2.6mg/L, 4.5mg/L and 0.3mg/L.
The test method comprises the following steps: and performing simulated rainfall for 10 times on each constructed green roof, collecting effluent after each rainfall, measuring the volume of the effluent and the concentration of nitrate nitrogen, total nitrogen and total phosphorus in the effluent, calculating the mass of the nitrate nitrogen, the total nitrogen and the total phosphorus in the effluent, and subtracting the mass of the nitrate nitrogen, the total nitrogen and the total phosphorus in the simulated rainfall rainwater from the mass of the nitrate nitrogen, the total nitrogen and the total phosphorus in the effluent to obtain the total leaching amount of each green roof small test device in each simulated rainfall so as to evaluate the leaching effect of the green roofs constructed by different matrix layers in the rainfall process. Wherein:
the determination of the nitrate nitrogen concentration in the effluent adopts an ultraviolet spectrophotometry;
the determination of the total nitrogen concentration in the effluent adopts an alkaline potassium persulfate digestion ultraviolet spectrophotometry;
the total phosphorus concentration in the effluent is measured by ammonium molybdate spectrophotometry.
Green roofs constructed using the substrate layers prepared in examples 1 to 5 and comparative examples 1 and 2 showed leaching amounts of nitrate nitrogen, total nitrogen and total phosphorus in simulated rainfall as shown in the following tables 1, 2 and 3, respectively:
TABLE 1 nitrate nitrogen leaching loss in 10-plant simulated rainfall for each green roof
Table 2 leaching loss of total nitrogen in 10 simulated rains for each green roof
TABLE 3 Total phosphorus leaching loss for 10 simulated rains for each green roof
As can be seen from the statistical data in tables 1 to 3, the volume ratio of the peat soil to the expanded vermiculite in the matrix layer is controlled to be about 2. Compared with comparative examples 1 and 2, the improved matrix layers prepared in examples 1 to 5 added with the polyaluminium chloride modifier greatly reduce leaching loss of nitrate nitrogen and total nitrogen in the matrix layers, and leaching loss amount of total phosphorus is correspondingly reduced, wherein the improved matrix layer prepared in example 4 has the optimal fertilizer retention effect on nitrate nitrogen and total nitrogen in the matrix layers.
According to the leaching loss test result, the improved matrix layer provided by the invention can effectively avoid leaching loss of nutrient elements such as nitrate nitrogen, total nitrogen and total phosphorus in the matrix layer, effectively adsorb and retain the nutrient elements required by plant growth in rainwater, reduce leaching loss effect of the nutrient elements in the green roof matrix layer in a rainfall process, and improve utilization of the vegetation on the matrix layer and the nutrient elements in the rainwater.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitutions or changes made by the person skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The green roof improvement matrix layer is characterized by comprising peat soil, expanded vermiculite and a modifier according to a volume ratio of 15% -20%:79% -82%: 1-3 percent of modifier, and the modifier is one or more of polyaluminium chloride, polyferric sulfate, polyvinyl alcohol, methylcellulose, sodium carboxymethylcellulose and hydroxypropyl methylcellulose.
2. The green roof modifying matrix layer of claim 1, wherein the peat soil has a particle size of less than 2mm.
3. The green roof improving matrix layer of claim 1, wherein said expanded vermiculite has a particle size of less than 4mm.
4. The green roof improving matrix layer of claim 1, wherein the modifier is present in the improving matrix layer at a volume ratio of 1.5% to 2.5%.
5. The green roof modifying matrix layer of claim 1, wherein the modified matrix layer has a bulk density of 240.32-260.32kg/m 3 。
6. The green roof modifying substrate layer of claim 1, wherein the green roof modifying substrate layer has a thickness of 10-20cm.
7. The method for preparing a green roof improvement matrix layer according to any one of claims 1 to 6, which is characterized by comprising the following steps:
sieving the crushed peat soil and the expanded vermiculite respectively, and drying after sieving;
mixing the dried peat soil, the expanded vermiculite and the modifying agent according to the volume ratio;
adding water into the mixture, stirring uniformly, and drying;
and (4) repeating the dry-wet cycle treatment in the step (3) for 3-5 times to obtain the improved matrix layer.
8. The method as claimed in claim 6, wherein the drying process is performed at 95-105 ℃ for 12-24h in step (1).
9. The method of claim 6, wherein in the step (3), water is added in an amount of 30-50% by volume of the mixture.
10. The method as claimed in claim 6, wherein the drying process is performed at 45-55 ℃ for 12-24h in step (3).
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