CN113461167A - Construction method of surface flow wetland system - Google Patents
Construction method of surface flow wetland system Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- 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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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F11/00—Treatment of sludge; Devices therefor
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/30—Aerobic and anaerobic processes
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- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
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- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
- C02F3/325—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae as symbiotic combination of algae and bacteria
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Abstract
The invention relates to the technical field of water ecological restoration and water environment treatment, and provides a construction method of a surface flow wetland system. According to the invention, a submerged plant planting area and a substrate improvement area are constructed in a water area, so that the interior of a surface flow wetland system can coexist in an aerobic area and a deficient/anaerobic area, and the purification capacity of the surface flow wetland system is improved; meanwhile, the iron-based material is added into the substrate improvement area, and the iron-based material can strengthen the denitrification and anaerobic ammonium oxidation processes of the anaerobic area, fix phosphorus in a water body and the substrate, reduce the release of phosphorus in the substrate, control the endogenous nitrogen and phosphorus load of the substrate and change the microenvironment of the substrate; and the reduction process of the iron (III) can increase the oxidation-reduction potential, thereby inhibiting the generation of methane and reducing the emission of greenhouse gases. The method provided by the invention can obviously improve the water purification capacity and ecological bearing capacity of the surface flow wetland, and can be widely applied to the improvement of the water quality and the bottom quality of urban slow flow riverways, wetland parks, ditches and landscape water bodies.
Description
Technical Field
The invention relates to the technical field of water ecological restoration and water environment treatment, in particular to a construction method of a surface flow wetland system.
Background
With the development of human socioeconomic technology and the change of global climate, natural wetland is in aegism with continuous degradation and increasing severity, in which case the repair and reconstruction of degraded wetland has become a focus of attention. Meanwhile, the pollution of urban production and life to main water bodies is increasingly aggravated, and a water quality purification technology for treating initial rainwater and sewage in an artificial wetland and then converging the treated initial rainwater and sewage into other main water bodies is rapidly developed in recent years; particularly, surface flow wetlands, channel type wetlands, ecological ponds and the like reconstructed from original riverways, channels and ponds are greatly popularized and applied in urban and rural areas.
With the implementation of ecological restoration engineering of lakes and grasses of mountain-water forest fields in China, more algae-type lakes turn to clear water stable states to become grass-type lakes, the number of urban wetland parks is increased, the surface flow wetland area in China is increased day by day, and the construction of the lakes has important significance for ecological civilization construction, regional water environment improvement and sustainable development of social economy.
However, the existing surface flow wetland has weak water quality purification function, and has the problems of difficult recovery and permanent planting of submerged vegetation, easy water quality deterioration during plant decay, large sediment endogenous nutrient load, large greenhouse gas emission and the like.
Disclosure of Invention
In view of the above, the invention provides a method for constructing a surface flow wetland system. The method provided by the invention can improve the ecological environment of the water body, improve the purification capacity of the surface flow wetland, control the endogenous nitrogen and phosphorus loads of the substrate and reduce the emission of greenhouse gases, and can regulate the surrounding environment, particularly the substrate environment, improve the plant diversity of the wetland and be suitable for large-scale application.
In order to achieve the above object, the present invention provides the following technical solutions:
a construction method of a surface flow wetland system comprises the following steps: constructing a submerged vegetation planting area and a substrate improvement area in a water area;
submerged plants are planted in the submerged vegetation planting area, and iron-based materials are placed in the water body substrate of the substrate improvement area; the water depth of the substrate improvement area is greater than that of the submerged vegetation planting area.
Preferably, the depth of the submerged vegetation planting area is less than or equal to 1.0m, and the area of the submerged vegetation planting area is 10-60% of the total area of the water area.
Preferably, the submerged plant is a native species.
Preferably, the submerged plant comprises one or more of eel grass, goldfish algae, hydrilla verticillata, watermifoil, curly pondweed and water caltrop.
Preferably, the water depth of the substrate improvement area is more than 1.0m, and the area of the substrate improvement area is 40-90% of the total area of the water area.
Preferably, the iron-based material is iron shavings or scrap iron; the width of the iron shavings is 10-40 mm, and the length is 50-250 mm.
Preferably, the iron-based material is placed in a substrate on the surface layer of a water body, and the placement depth is 0-150 mm; when the iron-based material is iron shavings, the iron shavings are placed vertically, obliquely or flatly.
Preferably, when the water area is a closed water area, the method further comprises the step of constructing a water body circulation flow making system in the water area.
Preferably, the construction method of the water body circulation flow making system comprises the following steps: a circulating flow-making pump is placed in a water body, a pump body of the circulating flow-making pump is positioned in the substrate improvement area, and a water outlet of the circulating flow-making pump is positioned in the submerged vegetation planting area.
Preferably, the flow velocity of the effluent of the circulating flow-making pump is less than the wave velocity of the water waves of the water body.
The invention provides a construction method of a surface flow wetland system, which comprises the following steps: constructing a submerged vegetation planting area and a substrate improvement area in a water area; submerged plants are planted in the submerged vegetation planting area, and iron-based materials are placed in the water body substrate of the substrate improvement area; the water depth of the substrate improvement area is greater than that of the submerged vegetation planting area. According to the invention, a submerged vegetation planting area is constructed in a water area to form a submerged preparation community, and the oxygen production by plant photosynthesis can promote the degradation of organic matters in the water body and the nitration reaction; meanwhile, root exudates provide a carbon source for rhizosphere microorganisms in the growth process of submerged plants, and can greatly change the physical and chemical environment of rhizosphere micro-areas and promote the conversion process of nutritive salts in sediments; nitrate produced in the submerged vegetation growing area is subjected to denitrification process in the anoxic/anaerobic zone through the action of microorganisms through water body flowing.
According to the invention, the iron-based material is placed in the substrate improvement area, and the corrosion process of the iron-based material can provide electrons for the denitrification process, so that the wetland denitrification process is promoted; fe3+Reduction to Fe2+The process can effectively improve the oxidation-reduction potential of the substrate and inhibit the generation of greenhouse gas methane; in addition, Fe released during iron shaving corrosion2+And Fe3+Can reduce phosphorus in water in the gap between the overlying water and the sediment, promote the fixation and mineralization of phosphate, and improve Fe content3+Can promote NH in the interstitial water of the sediment4 +The anaerobic oxidation process reduces the nitrogen load of the sediment and the overlying water.
Furthermore, the iron-based material adopted by the invention is iron shavings or scrap iron, belongs to industrial processing leftover materials/waste materials, and is simple to prepare, low in price and easy to obtain compared with the existing substrate modifier; and when the iron shavings are vertically or obliquely placed, the contact with the substrate can be increased, the conversion of organic matters or nutrient salts in the sediments is accelerated, and the planting and growth of the root systems of the plants are promoted.
In conclusion, the method provided by the invention enables aerobic and anoxic/anaerobic areas to coexist in the surface flow wetland system by constructing the submerged vegetation planting area and the substrate improvement area, thereby improving the purification capacity of the surface flow wetland system, controlling the substrate endogenous nitrogen and phosphorus loads, reducing the emission of greenhouse gases, obviously improving the water purification capacity and ecological bearing capacity of the surface flow wetland, and having wide application prospects in the improvement of water quality and substrate of urban slow flow riverways, wetland parks, ditches and landscape water bodies.
Drawings
FIG. 1 is a schematic structural diagram of a surface flow wetland system constructed by the invention;
fig. 2 is a plan view of a surface flow wetland system constructed in example 2;
fig. 3 is a plan view of a surface flow wetland system constructed in example 3;
fig. 4 is a cross-sectional view of a surface flow wetland system constructed in example 3;
in FIGS. 1 to 4: 1-submerged plant, 2-water body substrate, 3-iron-based material, 4-submerged vegetation planting area, 5-substrate improvement area, 6-water body slope bank, 7-circulating flow making pump and 8-circulating flow making pump water outlet.
Detailed Description
The invention provides a construction method of a surface flow wetland system, which comprises the following steps: constructing a submerged vegetation planting area and a substrate improvement area in a water area, wherein submerged plants are planted in the submerged vegetation planting area, and iron-based materials are placed in the water substrate of the substrate improvement area; the water depth of the substrate improvement area is greater than that of the submerged vegetation planting area.
The invention has no special requirements on the water area, can construct surface flow wetland water area, and can be specifically city slow flow river channel, wetland park, ditch, landscape water body, artificial surface flow wetland and the like.
In the invention, the depth of water in the submerged vegetation planting area is preferably less than or equal to 1.0m, more preferably 0.2-1.0 m, and further preferably 0.5-0.8 m, and the area of the submerged vegetation planting area is preferably 10-60% of the total area of a surface flow wetland water area, and more preferably 20-50%; the water depth of the substrate improvement area is preferably more than 1.0m, more preferably 1.5-5.0 m, and the area of the substrate improvement area is preferably 40-90% of the total area of the water area, more preferably 50-80%. The invention has no requirement on the position relation of the submerged vegetation planting area and the substrate improvement area, as long as the water depth meets the requirement, in the specific embodiment of the invention, preferably, the submerged vegetation planting area or the substrate improvement area is established in different areas of the water area according to the water depths of the areas, and the submerged vegetation planting area and the substrate improvement area are matched and distributed according to the proper water depths. In the embodiment of the invention, if the submerged vegetation planting area and the substrate improvement area cannot meet the area ratio of the two areas according to the original water depth of the water area, the substrate terrain of the water area is preferably modified so that the submerged vegetation planting area and the substrate improvement area can meet the area ratio.
In the invention, the submerged plant is preferably a local species, and particularly, the submerged plant preferably comprises one or more of eel grass, goldfish algae, hydrilla verticillata, watermifoil, curly pondweed and water caltrop; in the specific embodiment of the invention, the submerged plant community is preferably constructed compositely; the planting density of the submerged plants is preferably 50-150 plants/m2。
In the present invention, the iron-based material is preferably iron shavings or iron filings; the width of the iron shavings is preferably 10-40 mm, more preferably 20-30 mm, and the length is preferably 50-250 mm, more preferably 80-200 mm; the invention has no special requirement on the size of the scrap iron, and the scrap iron known by the technical personnel in the field can be used. In an embodiment of the invention, the ferrous material is preferably derived from rolled flakes and scrap with high iron content produced in steel processing.
In the invention, the iron-based material is preferably placed in the substrate on the surface layer of the water body, the placing depth is preferably 0-150 mm, and when the placing depth is 0mm, the iron-based material is flatly laid on the surface layer of the substrate on the surface layer of the water body; in the invention, when the iron-based material is iron shavings, the iron shavings are placed vertically, obliquely or flatly, and when the iron shavings are placed vertically or obliquely, the placement depth is measured by the depth of the bottom ends of the iron shavings in the water body bottom. In the embodiment of the invention, the iron shavings or iron filings are preferably thrown to the water surface to naturally sink, and after the iron shavings naturally sink, the iron shavings sink into the water body substrate in a vertical, inclined or flat mode.
In the invention, the dosage of the iron-based material is preferably 80-100 g/m2。
In the invention, when the water area is a closed water area, a water body circulating flow making system is constructed in the water area; the construction method of the water body circulation flow making system is preferably as follows: placing a circulating flow-making pump in a water body, wherein a pump body of the circulating flow-making pump is positioned in a substrate improvement area, specifically 0-20 cm above a water body substrate of the substrate improvement area, and preferably 5-15 cm above the water body substrate; and the water outlet of the circulating flow-making pump is positioned in the submerged vegetation planting area. The invention realizes the water body exchange of the submerged vegetation planting area and the substrate improvement area by constructing a circulating flow making system; the number of the flow-making pumps is not particularly required, and in the specific embodiment of the invention, the flow-making pumps are preferably set according to the size and the area of a closed water area, so that the water body exchange of the submerged vegetation planting area and the substrate improvement area can be realized.
In the invention, the pump body and the water outlet of the circulating flow-making pump are both positioned below the water surface.
In the invention, the flow speed of the effluent of the circulating flow-making pump is preferably less than the wave speed of the water waves of the water body; the invention controls the flow velocity of the effluent of the circulating pump to be less than the wave velocity of the water body water wave, which can not form obvious waves on the water surface, has small disturbance to the water area, has no obvious aeration effect and does not affect the dissolved oxygen content of the water body.
The construction method can improve the purification capacity of the surface flow wetland system, control the endogenous nitrogen and phosphorus load of the substrate and reduce the emission of greenhouse gases, and has the following specific action principle:
in the invention, the dissolved oxygen content of the overlying water body can be increased by photosynthesis of the submerged plant in the growth process, and the degradation of organic matters in the overlying water body and the nitration reaction are promoted; meanwhile, root exudates provide a carbon source for rhizosphere microorganisms in the growth process of submerged plants, the physical and chemical environments of rhizosphere micro-areas can be greatly changed, the conversion process of nutritive salts in sediments is promoted, and the reactions are as follows:
RCHNH2COOH+O2→RCOOH+CO2+NH3
NH3+H2O→NH4 ++HO-
NH4 ++1.5O2→NO2 -+2H++H2O
NO2 -+0.5O2→NO3 -
the exchange of water bodies is realized through the water body flow (the water body naturally flows or the water body flow is realized through flow making), the nitrate generated in the submerged vegetation recovery area generates a denitrification process in an anoxic/anaerobic area through the action of microorganisms, and N is generated in the denitrification process2O, and possibly under conditions of incomplete reaction, the reactions taking place in particular as follows:
NO3 -+2e-+2H+→NO2 -+H2O
NO2 -+e-+2H+→NO+H2O
2NO+2e-+2H+→N2O+H2O
N2O+2e-+2H+→N2+H2O
the invention adds the iron-based material into the water body substrate in the substrate improvement area, provides conditions for the iron autotrophic denitrification of the mud-water interface, reduces part of nitrate through the iron autotrophic denitrification process, and reduces N in the process2The amount of O produced, the reaction which takes place is specified below:
6NO3 -+10Fe+18H2O→3N2+10Fe3 ++36OH-
NO3 -+4Fe+7H2O→NH4 ++4Fe2++10OH-
2NO3 -+10Fe2++24H2O→N2+10Fe(OH)3+18H+
NO3 -+8Fe2++21H2O→NH4 ++8Fe(OH)3+14H+
in the interstitial spaces of the deposit, Fe produced by the denitrification process3+Can react with NH3 +And PO4 3-Reaction, namely promoting mineralization of phosphate in the overlying water and the sediment, realizing removal of ammonium nitrogen through Fe (II)/Fe (III) circulation and reducing nitrogen load of the sediment, wherein the reaction is specifically as follows:
Fe3++PO4 3-→FePO4
6Fe(OH)3+10H++2NH4 +→6Fe2++18H2O+N2
6Fe(OH)3+10H++NH4 +→6Fe2++16H2O+NO2 -
8Fe(OH)3+14H++NH4 +→8Fe2++21H2O+NO3 -
fe (iii) undergoes a reduction reaction during the conversion into fe (ii) by iron-reducing bacteria, the redox potential rises, and the reduction reaction occurs preferentially over the methane formation reaction (see the following formula):
CO2+8H++8e-→CH4+2H2O
the methane generating reaction can only occur when the oxidation-reduction potential is lower than-200 mv, and the method can improve the oxidation-reduction potential and inhibit the methane generating reaction, thereby effectively inhibiting the generation of methane gas.
Fig. 1 is a schematic structural diagram of a surface flow wetland system constructed by the invention, and the construction method of the invention is specifically explained with reference to fig. 1: constructing a submerged preparation planting area 4 at the water depth of less than or equal to 1.0m, planting submerged plants 1 in the submerged preparation planting area 4, constructing a substrate improvement area 5 at the water depth of more than 1.0m, and adding an iron-based material 3 into the water substrate of the substrate improvement area 5; and when the surface flow wetland system is a closed water area, constructing a circulating flow-making system in the closed water area.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
Example 1
4 groups of surface flow artificial wetland devices are constructed, and the devices have the same size and are all as follows: 1.0m multiplied by 0.25m multiplied by 0.7m, the same bottom mud is paved at the bottom of the device, the thickness is 10cm, the organic matter content is 8 percent, and the device is respectively numbered as (I), (II), (III) and (IV).
Surface flow wetland 1: a blank control group, submerged plants are not planted, and iron-based materials are not added into the substrate;
surface flow wetland 2: planting submerged plant tape grass with planting density of 100 plants/m2；
Surface flow wetland (c): adding iron shavings made of iron base material into the substrate, inserting the iron shavings into the bottom mud layer with the depth of 2-8 cm, and adding 100g/m2；
Surface flow wetland 4: planting the submerged plant tape grass in the front half section of the device according to the water flow direction, wherein the planting density is 100 plants/m2Adding iron wood shavings into the substrate of the second half section, wherein the iron wood shavings are placed in an inclined manner, the placing depth is 2-8 cm, and the adding amount is 100g/m2The tape grass planting area and the substrate improvement area respectively occupy 50% of the area of the wetland.
In the experimental process, the inlet water concentration of the control devices is the same, the hydraulic retention time is 3d, the outlet water concentration of each device is monitored, and the emission concentration of methane and nitrous oxide in the operation process of each device is monitored. The experiment is carried out for 3 months, and the effluent quality and the greenhouse gas emission flux of each experimental group are compared and shown in tables 1-2.
TABLE 1 comparison of the effluent quality of each experimental group
TABLE 2 comparison of greenhouse gas emission flux for each experimental group
According to the data in tables 1-2, the quality of the effluent of the device IV is better than that of the effluent of other groups, and the consumed CO is better2The quantity is more, the quantity of generated nitrous oxide gas is less, and methane is not generated basically, which shows that the surface flow wetland purification effect of the invention with the submerged plant planting area and the substrate improvement area is better, and the invention has the functions of controlling the substrate endogenous nitrogen and phosphorus loads and reducing the greenhouse gas emission.
Example 2
The implementation place of this embodiment is a certain city slow flow river course in Shanghai city, and this river course east and west trend is the broken end river, and the east side is continuous with another north-south trend river course, and this river reach length is about 500m, because the influence that receives peripheral domestic sewage and surface runoff, water ammonia nitrogen, total nitrogen and total phosphorus content are on the high side, are in the bad V class level of surface water.
In this embodiment, a surface flow wetland system is constructed based on a slow flow river, and the specific method includes:
constructing a submerged vegetation planting area: based on the original topography of the river channel, part of steep bank is reformed into gentle slope, submerged vegetation is planted in the area with the water depth of less than 1.0m at the two sides of the river channel, the submerged vegetation comprises eel grass, hornworts and hydrilla verticillata, the planting density is 100 plants/m2；
Construction of the substrate improvement zone: adding iron wood shavings into the substrate in the region with water depth greater than 1.0m in the river, wherein the adding amount of the iron wood shavings is 100g/m2。
Wherein, the area of the submerged vegetation planting area is 45 percent of the area of the water area, and the area of the substrate improvement area is 55 percent of the area of the water area.
The construction plan view of the surface flow wetland system in this example is shown in fig. 2.
In the implementation process of the scheme, the water quality of the river reach is monitored, after 3 months, submerged vegetation is basically recovered and grows well, the water quality of the water body reaches the IV-class level of surface water, and specific water quality detection data are shown in a table 3.
Table 3 example 2 comparison of river water quality before and after surface flow wetland construction
Example 3
The implementation place of the embodiment is a certain landscape water body in Shanghai city, the landscape water body is an artificial lake, a water source is pumped into river channel water by a pump, the river channel water body is surface water V-type water, but the water body has the problem of low transparency, and the area of the lake area is about 2.3 ten thousand meters2The lake region has a small amount of submerged vegetation growing, and the transparency of the water body is lower to be 40 +/-15 cm.
The embodiment of the invention constructs the surface flow wetland based on the landscape water body, and comprises the following steps:
constructing a submerged vegetation planting area: based on the original topography of lake region, reforming partial steep bank into gentle slope, planting submerged plant including low eel grass, foxtail algae and potamogeton crispus in the area with water depth less than 0.6m on both sides of lake bank and water depth less than 0.8m in lake, planting density is 100 plants/m2(ii) a The construction area of the submerged vegetation planting area is 55 percent of the area of the water area.
Construction of the substrate improvement zone: in the region with water depth greater than 1.0m in the river channel, adding iron filings into the substrate, wherein the adding amount of the iron filings is 80g/m2The area of the substrate improvement area is 45% of the area of the water area.
The lake area is provided with two circulating flow-making pumps, the pump body is placed in the substrate improvement area, the water outlet is located in the submerged vegetation planting area, the pump body and the water outlet of each circulating flow-making pump are both located below the water surface, and the power of each circulating flow-making pump is 0.75 kW.
The constructed plan view of the surface flow wetland system in the present embodiment is shown in fig. 3, and the sectional view is shown in fig. 4.
In the implementation process of the technical scheme, the water quality of the lake inflow and the lake area is monitored, 3 months later, the submerged vegetation is basically recovered, the growth is good, the water quality of the water body is basically stable and reaches the level of III types of surface water, the transparency of the water body reaches 1.2m, and the specific water quality monitoring data are shown in a table 4.
Table 4 example 3 water quality comparison of lake zones before and after construction of surface flow wetland
According to the embodiment, the submerged vegetation planting area and the substrate improvement area are constructed, so that the aerobic and anoxic/anaerobic areas coexist in the surface flow wetland system, and the purification capacity of the surface flow wetland system is improved; meanwhile, the iron-based material enhances the denitrification and anaerobic ammonia oxidation processes of the anaerobic zone, and can play a role in controlling the nitrogen and phosphorus loads of the substrate and inhibiting the emission of greenhouse gases; the method provided by the invention can obviously improve the water body purification capacity and ecological bearing capacity of the surface flow wetland, and has wide application prospect.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The construction method of the surface flow wetland system is characterized by comprising the following steps: constructing a submerged vegetation planting area and a substrate improvement area in a water area;
submerged plants are planted in the submerged vegetation planting area, and iron-based materials are placed in the water body substrate of the substrate improvement area; the water depth of the substrate improvement area is greater than that of the submerged vegetation planting area.
2. The construction method according to claim 1, wherein the depth of the submerged vegetation growing area is less than or equal to 1.0m, and the area of the submerged vegetation growing area is 10-60% of the total area of the water area.
3. The method of constructing according to claim 1, wherein the submerged plant is a native species.
4. The method according to claim 1 or 3, wherein the submerged plant comprises one or more of Kucao, Goldfish algae, Black algae, Focus vesiculosus, curly pondweed, and Espera.
5. The method of claim 1, wherein the substrate improvement zone has a water depth of > 1.0m and an area of 40-90% of the total area of the body of water.
6. The method of claim 1, wherein the iron-based material is iron shavings or scrap iron; the width of the iron shavings is 10-40 mm, and the length is 50-250 mm.
7. The construction method according to claim 1 or 6, wherein the iron-based material is placed in a water body surface substrate to a depth of 0-150 mm; when the iron-based material is iron shavings, the iron shavings are placed vertically, obliquely or flatly.
8. The method of constructing as claimed in claim 1, wherein when the body of water is an enclosed body of water, further comprising constructing a water circulation flow-making system in the body of water.
9. The construction method according to claim 8, wherein the water body circulation flow-making system is constructed by the following steps: a circulating flow-making pump is placed in a water body, a pump body of the circulating flow-making pump is positioned in the substrate improvement area, and a water outlet of the circulating flow-making pump is positioned in the submerged vegetation planting area.
10. The construction method according to claim 9, wherein the flow velocity of the effluent of the circulating pump is less than the wave velocity of the water waves of the water body.
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| CN112759087A (en) * | 2020-12-16 | 2021-05-07 | 郑州大学环境技术咨询工程有限公司 | Denitrification artificial wetland integrated purification system and sewage ecological purification method |
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| WO2020114039A1 (en) * | 2018-12-04 | 2020-06-11 | 浙江大学 | System and method for intercepting nitrogen and phosphorus in countryside landscape type ecological ditch |
| CN110451651A (en) * | 2019-09-03 | 2019-11-15 | 上海交通大学 | A kind of drowned flow artificial wet land and its application |
| CN112759087A (en) * | 2020-12-16 | 2021-05-07 | 郑州大学环境技术咨询工程有限公司 | Denitrification artificial wetland integrated purification system and sewage ecological purification method |
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