CN112028255A - Wetland filler and constructed wetland - Google Patents
Wetland filler and constructed wetland Download PDFInfo
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- CN112028255A CN112028255A CN202010718927.4A CN202010718927A CN112028255A CN 112028255 A CN112028255 A CN 112028255A CN 202010718927 A CN202010718927 A CN 202010718927A CN 112028255 A CN112028255 A CN 112028255A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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Abstract
The invention provides a wetland filler and an artificial wetland, belongs to the technical field of artificial wetlands, and particularly relates to a construction waste regeneration wetland filler and an artificial wetland, wherein the wetland filler comprises a construction waste regeneration aggregate, the construction waste regeneration aggregate is at least one of concrete regeneration aggregate, brick regeneration aggregate or brick mixed aggregate, the particle size of the construction waste regeneration aggregate is at least one of particle size grades of 8-16mm, 10-20mm, 16-32mm and 20-40mm, the construction waste regeneration aggregate is used as the wetland filler, on one hand, a large amount of construction waste can be digested, the environmental protection benefit is remarkable, on the other hand, in the regeneration process of the construction waste regeneration aggregate, the particle size, porosity, physical and chemical properties and other parameters are controllable and adjustable, and the wetland sewage purification effect is remarkable.
Description
Technical Field
The invention relates to the technical field of constructed wetlands, in particular to a building waste regenerated wetland filler and a constructed wetland. .
Background
The total amount of construction waste in our country can reach about 15.5 to 24 billions of cubic meters per year according to statistics, and the increase rate is continuously increased by more than 10% per year. At present, most of the construction wastes in China are directly transported to the outskirts for open-air stacking or landfill without treatment, and the stacking of 1 ten thousand tons of construction wastes occupies land of about 670 and 1340 square meters. The disposal mode of the landfill type construction waste not only occupies a large amount of precious cultivated land for a long time, but also consumes a large amount of construction expenses such as expropriated land expenses, garbage clearing and transporting expenses and the like, and meanwhile, the loose and ash flying dust generated in the clearing and transporting process seriously influences the appearance environment of the city. The main components of the construction waste are waste red bricks and waste concrete, the internal porosity of the waste red bricks and the waste concrete is high, the external part of the waste red bricks and the waste concrete is rough, the specific surface area is large, and the construction waste is suitable for the field of water treatment such as artificial wetland and the like.
The application problem of the building waste recycled aggregate in the aspect of water treatment is solved, the dilemma of the building waste surrounding city can be solved, the advantages of the building waste can be exerted, a new filler is provided for water treatment, the cost of the filler for water treatment is reduced, the market prospect is wide, and the economic value and the social benefit are good.
Disclosure of Invention
The invention aims to provide a wetland filler prepared from construction waste recycled aggregate for treating various pollutants in sewage, and researches the water quality purification effect of the construction waste recycled aggregate to determine the components and the performance of the construction waste recycled wetland filler, thereby realizing the reclamation of the construction waste and simultaneously providing a high-quality wetland filler for water quality purification.
In order to achieve the purpose, the invention provides a wetland filler which comprises construction waste recycled aggregate, wherein the construction waste recycled aggregate is at least one of concrete recycled aggregate, brick recycled aggregate or brick mixed aggregate, and the particle size of the construction waste recycled aggregate is at least one of particle size grades of 8-16mm, 10-20mm, 16-32mm and 20-40 mm.
Preferably, the wetland filler further comprises at least one of zeolite, volcanic rock and limestone.
Preferably, the construction waste recycled aggregate is prepared by the following method:
(1) pretreating, namely crushing the construction waste into granules with the particle size of 48-52cm, and crushing the granules into aggregates with the particle size of less than 40mm by using a jaw crusher;
(2) and (4) dedusting, screening and grading, namely dedusting and screening the aggregate obtained by pretreatment to obtain the construction waste recycled aggregate with a preset particle size grade.
The invention provides an artificial wetland comprising the wetland filler, and the filler is analyzed and selected by researching the removal rate of the construction waste with different components on COD, BOD, ammonia nitrogen, total phosphorus and total nitrogen in pollutants.
The artificial wetland is provided with a wetland filler layer, the wetland filler used in the wetland filler layer is the wetland filler, and the filling porosity of the wetland filler of the artificial wetland is more than 55%.
Preferably, constructed wetland still includes the plant and purifies the layer, the plant purify the layer plant in on the wetland filler layer, wherein the plant is at least one of reed, arundo donax linn, cattail, zizania latifolia.
Preferably, the thickness of the wetland filler layer is 1.2-1.8m, and preferably, the thickness of the wetland filler layer is 1.5 m.
Preferably, the wetland filler comprises garbage recycled mixed aggregate of brick recycled aggregate and concrete recycled aggregate, wherein the mass content of the brick recycled aggregate is 40-85%, and preferably, the mass content of the brick recycled aggregate is 50-80%.
Preferably, the particle size grade of the garbage recycled mixed aggregate is 10-20mm, and the mass content of the brick recycled aggregate is 50%.
Preferably, the wetland packing layers comprise a first wetland packing layer and a second wetland packing layer from top to bottom, the first wetland packing layer and the second wetland packing layer have different packing components or different grain diameters, and the layer height ratio of the first wetland packing layer to the second wetland packing layer is (7:8) - (9: 7); preferably, the layer height ratio is 8: 7.
Preferably, the first wetland filler layer and the second wetland filler layer are brick-concrete recycled aggregate consisting of brick recycled aggregate and concrete recycled aggregate, wherein the mass content of the brick recycled aggregate is 80%, the wetland filler particle size of the first wetland filler layer is 10-20mm, and the wetland filler particle size of the second wetland filler layer is 20-40 mm.
Compared with the prior art which uses natural wetland fillers such as waste rocks, limestone, volcanic rocks and the like, the wetland filler provided by the invention has the following technical advantages:
(1) the raw materials are wide in source and low in price, and the recycling of the building waste recycled aggregate is realized;
(2) the sewage treatment device has the advantages of rich pore structure, high porosity and large specific surface area, and can effectively adsorb and filter various impurities in sewage, form a physical and biological filter layer and fully purify and filter the sewage.
(3) The building garbage recycled aggregate contains more mineral components such as magnesium and aluminum and is used for purifying NH in wastewater4 +N, TP, more adsorption sites are provided to favor NH4 +-N, TP removal.
(3) The particle size of the recycled aggregate of the construction waste is adjustable and controllable, so that the method is suitable for different wetland sewage treatment requirements.
The constructed wetland provided by the invention adopts the wetland filler, so that the cost of the wetland filler is reduced, a large amount of building wastes can be digested, in addition, the physical properties of various types of building recycled aggregate, such as adjustable and controllable particle size, high porosity, more mineral components such as magnesium, aluminum and the like, can effectively solve the problem of poor cooperative control of various pollutants in wetland sewage, and improve the purification effect of the wetland on various pollutants.
Detailed Description
The invention is further described below with reference to specific embodiments.
The embodiment of the invention aims to provide a wetland filler and an artificial wetland, which are low in cost and wide in source, wherein the wetland filler is mainly prepared from construction waste recycled aggregate, including concrete recycled aggregate and brick recycled aggregate, and the constructed wetland filler is used as the wetland filler to construct the artificial wetland by utilizing the advantages of wide source, low cost, high porosity, strong water absorption and adjustable and controllable particle size of the construction waste recycled aggregate so as to purify various pollutants in sewage and improve the synergistic purification effect of the artificial wetland on the various pollutants in the sewage.
Specifically, the invention firstly provides a wetland filler which comprises construction waste recycled aggregate, wherein the construction waste recycled aggregate is at least one of concrete recycled aggregate, brick recycled aggregate or brick-mixed aggregate, and the particle size of the construction waste recycled aggregate is at least one of particle size grades of 8-16mm, 10-20mm, 16-32mm and 20-40 mm.
The wetland filler has the beneficial effects that:
(1) the raw materials are wide in source and low in price, and the recycling of the building waste recycled aggregate is realized;
(2) the sewage treatment device has the advantages of rich pore structure, high porosity and large specific surface area, and can effectively adsorb and filter various impurities in sewage, form a physical and biological filter layer and fully purify and filter the sewage;
(3) the building garbage recycled aggregate contains more mineral components such as magnesium and aluminum and is used for purifying NH in wastewater4 +N, TP, mention may be madeFor more adsorption sites, in favor of NH4 +-N, TP removal;
(4) the particle size of the recycled aggregate of the construction waste is adjustable and controllable, so that the method is suitable for different wetland sewage treatment requirements.
In a preferred embodiment, the wetland filler further comprises at least one of zeolite, volcanic rock and limestone.
Specifically, in one embodiment, the wetland filler is pure brick recycled aggregate, and the particle size is 8-16 mm;
in one embodiment, the wetland filler is pure concrete recycled aggregate, and the particle size of the wetland filler is 16-32 mm;
in one embodiment, the wetland filler is a mixture of brick recycled aggregate and concrete recycled aggregate, the particle size is 8-16mm, and the mass ratio of the brick recycled aggregate to the concrete recycled aggregate is 1: 1;
in one embodiment, the wetland filler is a mixture of brick recycled aggregate, concrete recycled aggregate and zeolite, the particle size is 8-16mm, and the mass ratio of the brick recycled aggregate to the concrete recycled aggregate to the zeolite is (3-5) to (1-2); in a preferred embodiment, the brick recycled aggregate, the concrete aggregate and the zeolite mixture comprise 85% of brick recycled aggregate and 15% of zeolite.
The brick-concrete recycled aggregate is a mixed aggregate of brick recycled aggregate and concrete recycled aggregate, the mass ratio of the brick recycled aggregate to the concrete recycled aggregate is (1-2) to (2-1), and in a specific embodiment, the mass ratio of the brick recycled aggregate to the concrete recycled aggregate in the brick-concrete recycled aggregate is 1: 1.
Specifically, the preparation method of the construction waste recycled aggregate comprises the following steps: firstly, crushing construction wastes such as waste bricks and waste concrete to particles with the particle size of about 50cm, then crushing the construction wastes into aggregates with the particle size of less than 40mm by using a jaw crusher, and then dedusting and screening the aggregates obtained by pretreatment and crushing to obtain the construction waste recycled aggregates with the preset particle size grade, wherein the particle size can be one of 8-16mm, 16-32mm, 10-20mm and 20-40 mm.
In some embodiments, if the wetland filler comprises a multi-component construction waste recycled aggregate, a single-component aggregate is obtained according to the steps and then mixed according to the specific component requirements.
The invention also provides an artificial wetland, which is provided with a wetland filler layer, the adopted wetland filler is any one of the wetland fillers in the above embodiments, and the filling porosity of the wetland filler of the artificial wetland is more than 55 percent.
In a specific embodiment, the artificial wetland further comprises a plant purification layer, the plant purification layer is planted on the wetland filler layer, the plant is at least one of reed, arundo donax linn, cattail and wild rice stem, in a preferred embodiment, the plant purification layer is reed, and the row spacing between adjacent reed is 30 cm.
In one embodiment, the plant purification layer can be planted in the wetland filler layer in a root-induced manner.
A plant purification layer such as reed is arranged in the artificial wetland, and on one hand, the developed root system of the plant absorbs NH in the sewage4 +And (2) the absorption of N, TN and TP, and on the other hand, the plant root absorption and the physical adsorption, chemical precipitation and microbial purification synergistic effect of the wetland packing layer further improve the sewage purification effect of the wetland packing layer.
In a preferred embodiment, the thickness of the wetland filler layer is 1.2-1.8m, and preferably the thickness of the wetland filler layer is 1.5 m.
The thickness of the wetland packing layer needs to be selected by comprehensively considering the wetland sewage treatment effect, the hydraulic retention time, the raw material cost of the packing and the maintenance cost, and experiments prove that the comprehensive operation effect of the artificial wetland is better when the thickness of the wetland packing layer is 1.2-1.8m, and in a preferred embodiment, the thickness of the wetland packing layer is 1.5 m.
In a preferred embodiment, the wetland filler comprises garbage recycled mixed aggregate of brick recycled aggregate and concrete recycled aggregate, wherein the mass content of the brick recycled aggregate is 40-85%, and preferably, the mass content of the brick recycled aggregate is 50-80%.
In a preferred embodiment, the wetland filler layers can be arranged in layers and comprise a first wetland filler layer and a second wetland filler layer from top to bottom, the first wetland filler layer and the second wetland filler layer have different filler components or different particle sizes, the layer height ratio of the first wetland filler layer to the second wetland filler layer is 7:8-9:7, and in a preferred embodiment, the layer height ratio of the first wetland filler layer to the second wetland filler layer is 8: 7.
Specifically, in a preferred embodiment, the thickness of the first wetland filler layer is 80cm, the thickness of the second wetland filler layer is 70cm, wherein the first wetland filler layer and the second wetland filler layer are both brick-mixed recycled aggregate of brick recycled aggregate and concrete recycled aggregate, but the particle diameters of the first wetland filler layer and the second wetland filler layer are different, the particle diameter of the wetland filler of the first wetland filler layer is 10-20mm, and the particle diameter of the wetland filler of the second wetland filler layer is 20-40 mm.
Further, in order to fully exert the advantages of the construction waste recycled aggregate and the natural aggregate in sewage purification, in a preferred embodiment, the wetland packing layer is arranged in two layers, the first wetland packing layer is brick-mixed recycled aggregate of brick recycled aggregate and concrete recycled aggregate, the particle size of the brick-mixed recycled aggregate is 10-20mm, the mass ratio of the brick recycled aggregate to the concrete recycled aggregate in the brick-mixed recycled aggregate is 1:1, the second wetland packing layer is a natural aggregate wetland packing layer composed of zeolite, volcanic rock and limestone, the particle size of the natural aggregate packing layer is 10-20mm, and the mass ratio of the first wetland packing layer to the second wetland packing layer is 85: 15.
In another preferred embodiment, the first wetland packing layer is a natural aggregate wetland packing layer composed of zeolite, volcanic rock and limestone, and the second wetland packing layer is brick-mixed recycled aggregate of brick recycled aggregate and concrete recycled aggregate, and the particle size of the brick-mixed recycled aggregate is 10-20mm, wherein the mass ratio of the brick recycled aggregate to the concrete recycled aggregate in the brick-mixed recycled aggregate is 1: 1.
Compared with a single-layer wetland packing layer, the wetland packing layer is arranged in a layered manner, and the granularity is set to improve the porosity of the wetland packing layer and to be NH4 +The adsorption of N provides more adsorption sites, and meanwhile, the increase of the porosity is beneficial to the diffusion of oxygen and the nitration reactionFurther, purification of TN in the sewage is facilitated.
In a preferred embodiment, the artificial wetland is a vertical flow artificial wetland, that is, the sewage enters the artificial wetland from top to bottom, specifically, the sewage of the artificial wetland enters from the surface layer and is purified through the synergistic effect of the wetland filler layer, the plant purification layer and the microorganisms.
In order to fully explain the technical effects of the wetland filler, the application provides a sewage purification test of a plurality of groups of wetland fillers and artificial wetlands to further explain the sewage purification performance.
Example 1
A series of building waste regeneration wetland fillers are prepared by respectively taking waste concrete, waste bricks and zeolite as raw materials, samples 1-5 are sequentially adopted, the prepared wetland fillers are cleaned for 5-6 times and dried for later use, and the specific types are shown in Table 1.
TABLE 1 wetland Filler composition
Note: the pure brick refers to 100% of brick recycled aggregate; the pure concrete is 100% recycled concrete aggregate.
After the wetland filler is prepared, a filler column is adopted to simulate the wetland environment to test the performance of the wetland filler, wherein the filling height of the filler is 80cm, the water head on the column is 20cm, and the inlet water is in an up-down type. The inflow rate is controlled by a peristaltic pump, and the hydraulic retention time is 24 h.
The water inlet of the filler column is artificially prepared sewage, the water inlet is surface inferior V-class water, the water inlet time is 1-38 days, and the specific water inlet components are shown in table 2 (the concentration of each pollutant in the table refers to the average water inlet concentration of each pollutant in the sewage in the test period, the same applies below)
TABLE 2 Filler column feed Water composition
Note: BOD is biological oxygen demand, which refers to the amount of dissolved oxygen consumed in a biochemical reaction process in which microorganisms decompose biochemically degradable organic matter present in water under certain conditions;
COD is chemical oxygen demand, which means that the amount of reducing substances needing to be oxidized in a water sample is measured by a chemical method;
TN means total nitrogen and is the content of various forms of organic and inorganic nitrogen in water;
TP is total phosphorus and refers to the sum of the phosphorus present in the inorganic and organic states.
The effluent concentrations of each contaminant during the test period are shown in table 3.
TABLE 3 Packed column effluent concentration
Example 2
Building waste recycled aggregate, limestone, volcanic rock and zeolite with different particle sizes are used as wetland fillers, four different small artificial wetlands are constructed to further investigate the actual intake water quality purification effect, each device is provided with a reed layer, the row spacing of the reed layers is 30 x 30cm, the height of filler layers of the artificial wetlands is 1.5m, a water intake tank is arranged in front of the artificial wetlands, the size of the water intake tank is 2m x 1.5m, the size of a wetland bed is (0.5 x 1m x 2m), and the filler layer components in each artificial wetland are shown in table 4
The experimental inlet water is outlet water of a river-cleaning reclaimed water plant, upper inlet and lower outlet type continuous inlet water is adopted, and the hydraulic retention time of each wetland system is 27 hours. During operation, the daily operating water temperature is monitored. Collecting inflow water and outflow water every 5 days, and measuring the water quality. The indicators of water quality include pH and NH4 +N, TN, TP, COD, BOD, etc.
TABLE 4 constructed wetland Filler layer composition
Table 5 water intake composition of constructed wetland model in experimental period
After the filling of the filler is completed, the porosity of the filler of each artificial wetland model is detected, and the porosity of the filler of each artificial wetland is shown in the following table 64 +The adsorption and adhesion of N, TP and TN are realized, and simultaneously, the adhesion of microorganisms in the sewage is facilitated, and the sewage purification effect of the artificial wetland is improved through the synergistic effect of physical adsorption, chemical precipitation and microorganisms.
TABLE 6 porosity of artificial wetland model packing
| Artificial wetland model | Porosity of the material |
| 1# wetland | 67.6％ |
| 2# wetland | 58.8％ |
| 3# wetland | 57.0％ |
| 4# wetland | 43.8％ |
TABLE 7 Water composition of the artificial wetland models
The experimental data show that compared with natural aggregate, the wetland filler prepared from the construction waste recycled aggregate has obvious purification effect on removal of TN and TP, but has obvious purification effect on NH4 +The purification performance of the recycled aggregate of the construction waste is slightly weaker in the aspect of the purification of the N organic matters, such as removal of COD and BOD.
Further, in order to comprehensively evaluate the sewage purification performance of each artificial wetland model, the effluent of the four artificial wetland models is comprehensively evaluated by using an endorome pollution index method. Due to the temperature reduction in the later period of research, TN removal effect of each aggregate model is poor. NH was selected accordingly as an evaluation factor4 +N, TP, COD, BOD, and the concentration of all the aggregate models after the purification effect was started was selected. In the calculation and evaluation process, the standard value of the surface III type water is used as a reference. The rating formula is:
wherein i is 1, 2, …, n; j is 1, 2, …, m
In the formula, CiThe concentration value is the concentration value actually measured by the i-type pollution factor, mg/L;
lijis a j-type standard concentration value of i-type pollution factors, mg/L;
Fmaxis the maximum value in Fi;
Faveis the average of Fi;
p is the inner Metro contamination index.
TABLE 8 actual Merluo contamination index in Water
| Artificial wetland model | Internal Mello pollution index | Water quality grade |
| Inflow water | 1.171 | IV |
| 1# wetland | 0.846 | III |
| 2# wetland | 0.851 | III |
| 3# wetland | 0.713 | III |
| 4# wetland | 0.786 | III |
The standard value of the III-class water on the earth surface is used as a reference, and the calculation shows that the inlet water quality is IV-class water, and the outlet water of each model meets the III-class water standard. At this time, the order of the purifying effect of each model from good to bad is as follows: 3# wetland (15+ 50% model) >4# wetland (natural model) >1# wetland (8+7+ 80% model) >2# wetland (15+ 80% model).
The artificial wetland is used for treating various harmful components in sewage and mainly comprises NH4 +TN, TP, COD, BOD, in order to realize the discharge to reach standard of sewage, the wetland filler should consider all harmful components in the sewage comprehensively when selecting, and the purification principle and the purification effect of each component in the sewage are as follows:
(1)NH4 +purification of-N, NH4 +The above test results of examples 1-2 show that the zeolite has the best purification effect in terms of ammonia removal because of the presence of a large amount of Na around the unique alundum of zeolite+、Mg2+、Ca2+Plasma metal ions which are easily reacted with NH in water4 +The exchange takes place so that the zeolite has good ammonia removal capacity.
(2) In the artificial wetland system, the contribution rate of nitrification and denitrification of microorganisms to the removal of nitrogen can reach about 75%, meanwhile, the root system of the plant not only can provide physical support for the survival of the microorganisms, but also can provide an aerobic environment necessary for the survival of aerobic microorganisms in the water body, and the planting of plants such as reed and the like is favorable for the removal of the nitrogen. In the artificial wetland system, the plants and the microorganisms realize an environment with oxygen and oxygen deficiency, and the synergistic effect is better exerted. The porosity of each recycled aggregate model is larger than that of the No. 4 natural aggregate model, on one hand, a suitable place is provided for the deposition of nitrogen, and on the other hand, the larger the porosity is, the faster the oxygen in the medium is diffused, and the more favorable the nitrification is.
(3) The TP is removed mainly through the actions of filler adsorption, chemical precipitation, plant absorption, microorganism utilization and the like, in the embodiment provided by the invention, the three building garbage recycled aggregate models have better TP removal effects than the natural aggregate model, on one hand, the building garbage recycled aggregate has abundant Fe, Al, Ca and other metal elements which are easy to form precipitates or complexes with the phosphorus in water, on the other hand, the porosity of the building garbage recycled aggregate is larger, and more adsorption sites are provided.
(4) The purification of organic matters (COD and BOD) and the purification mechanism of organic pollutants mainly comprise the filtering action of fillers, the microbial decomposition and the plant absorption action, and the brick regenerated aggregate has more obvious advantages in the aspect of adsorbing and filtering the organic matters compared with the concrete regenerated aggregate due to factors such as large specific surface and large surface roughness, and further, the plant root system of the artificial wetland also has stronger adsorption action on the organic matters and has obvious effect on the purification of the organic matters.
Therefore, the construction waste regeneration filler has certain advantages as the constructed wetland filler, can play a good purifying role on the water body, simultaneously realizes the resource utilization of the construction waste and reduces the maintenance cost of the constructed wetland.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The usage of the words first, second and third, etcetera do not indicate any ordering and these words may be interpreted as names.
Claims (10)
1. The wetland filler is characterized by comprising construction waste recycled aggregate, wherein the construction waste recycled aggregate is at least one of concrete recycled aggregate, brick recycled aggregate or brick mixed aggregate, and the particle size of the construction waste recycled aggregate is at least one of particle size grades of 8-16mm, 10-20mm, 16-32mm and 20-40 mm.
2. The wetland filler according to claim 1, characterized in that the wetland filler further comprises at least one of zeolite, volcanic rock, limestone.
3. The wetland filler according to claim 1, wherein the construction waste recycled aggregate is prepared by the following method:
(1) pretreating, namely crushing the construction waste into granules of 48-52cm, and crushing the granules into aggregates with the particle size of less than 40mm by using a jaw crusher;
(2) and (4) dedusting, screening and grading, namely dedusting and screening the aggregate obtained by pretreatment to obtain the construction waste recycled aggregate with a preset particle size grade.
4. The constructed wetland is characterized in that the constructed wetland is provided with a wetland filler layer, the wetland filler used in the wetland filler layer is the wetland filler of any one of claims 1 to 3, and the filling porosity of the wetland filler of the constructed wetland is more than 55%.
5. The constructed wetland of claim 4, further comprising a plant purification layer planted on the wetland filler layer, wherein the plant is at least one of reed, bamboo reed, cattail and wild rice grass.
6. The constructed wetland according to claim 4, wherein the thickness of the wetland filler layer is 1.2-1.8m, and preferably the thickness of the wetland filler layer is 1.5 m.
7. The constructed wetland according to claim 6, wherein the wetland filler comprises a garbage recycled mixed aggregate of brick recycled aggregate and concrete recycled aggregate, wherein the mass content of the brick recycled aggregate is 40-85%, and preferably the mass content of the brick recycled aggregate is 50-80%.
8. The constructed wetland according to claim 7, wherein the garbage recycled mixed aggregate has a particle size grade of 10-20mm, and the brick recycled aggregate has a mass content of 50%.
9. The constructed wetland according to claim 6, wherein the wetland filler layers comprise a first wetland filler layer and a second wetland filler layer from top to bottom, the first wetland filler layer and the second wetland filler layer have different filler components or different particle sizes, the layer height ratio of the first wetland filler layer to the second wetland filler layer is (7:8) - (9:7), and preferably the layer height ratio is 8: 7.
10. The constructed wetland according to claim 9, wherein the first wetland filler layer and the second wetland filler layer are both garbage recycled mixed aggregates of brick recycled aggregates and concrete recycled aggregates, wherein the mass content of the brick recycled aggregates is 80%, the particle size of the first wetland filler layer is 10-20mm, and the particle size of the second wetland filler layer is 20-40 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010718927.4A CN112028255A (en) | 2020-07-23 | 2020-07-23 | Wetland filler and constructed wetland |
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| CN202010718927.4A CN112028255A (en) | 2020-07-23 | 2020-07-23 | Wetland filler and constructed wetland |
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| CN112028255A true CN112028255A (en) | 2020-12-04 |
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| CN113003708A (en) * | 2021-03-10 | 2021-06-22 | 广东昂为环保产业有限公司 | Ammonia nitrogen removal mixed filter material, application thereof and constructed wetland |
| CN113058578A (en) * | 2021-04-07 | 2021-07-02 | 上海应用技术大学 | Ammonia nitrogen adsorbent and preparation method and application thereof |
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