METHOD FOR RESTORING ECOLOGICAL ENVIRONMENT BY UTILIZING EMERGENT AQUATIC PLANTS

Abstract

The present invention relates to the field of water environment treatment, and particularly discloses a method for restoring an ecological environment by utilizing emergent aquatic plants. According to the present invention, by arranging a magnetization reactor around the emergent aquatic plants to carry out intermittent magnetization induction on the emergent aquatic plants, the available quantity of plant root systems for mineralized substances in a micro-environment, such as inorganic phosphorus and the like, is increased, the limitation of maximum biomass is broken through, the oxygen conveying effect of the roots of the aquatic plants is promoted, and the hydraulic transmission effect is maintained and enhanced; and under the condition that the planting density of the plants is not increased, the pollutant absorption and conversion capacity of the emergent aquatic plants is promoted and improved, and the purification and ecological restoration efficiency of the emergent aquatic plants for a water environment is improved by about 30%.

Claims

1. A method for restoring an ecological environment by utilizing emergent aquatic plants, characterized in that a magnetization reactor is arranged around the emergent aquatic plants to carry out intermittent magnetization induction on the emergent aquatic plants and a water environment where the emergent aquatic plants are located to promote ecological restoration of the water environment.

2. The method according to claim 1, characterized in that intermittent magnetization is carried out on a water body, wherein the magnetic field intensity is 50 mT to 500 mT, an intermittent period is 3 h to 48 h, and one-time magnetization time is 5 min to 120 min.

3. The method according to claim 2, characterized in that the emergent aquatic plants are selected from one or more of typha angustifolia, lotuses, bowl lotuses, phragmites australis, typha orientalis, zizania latifolia, scirpus validus vahl, giant reed, phyllostachys heteroclada, scirpus validus vahl, acorns calamus linn, cortaderia selloana and sparganium stoloniferum.

4. The method according to claim 3, characterized in that the emergent aquatic plants are formed by a combination of the lotuses, the typha orientalis and the scirpus validus vahl, a plant density ratio of the lotuses to the typha orientalis to the scirpus validus vahl is 5:1:1, the magnetic field intensity of intermittent magnetization is 400 mT, the intermittent period is 5 h, and the one-time magnetization time is 20 min.

5. The method according to claim 3, characterized in that the emergent aquatic plants are formed by a combination of the acorns calamus linn, the cortaderia selloana and the sparganium stoloniferum, a plant density ratio of the acorns calamus linn to the cortaderia selloana to the sparganium stoloniferum is 1:1:1; and the magnetic field intensity of intermittent magnetization is 200 mT, the intermittent period is 15 h, and the one-time magnetization time is 60 min.

6. The method according to claim 3, characterized in that the emergent aquatic plants are formed by a combination of the typha angustifolia, the bowl lotuses and the phragmites australis, a plant density ratio of the typha angustifolia to the bowl lotuses to the phragmites australis is 1:2:1; and the magnetic field intensity of intermittent magnetization is 100 mT, the intermittent period is 30 h, and the one-time magnetization time is 90 min.

Description

DETAILED DESCRIPTION

[0029] Preferred embodiments of the present invention will be illustrated in detail below in connection with embodiments. It should be understood that embodiments given below are merely used for illustration, rather than limiting the scope of the present invention. Those of ordinary skill in the art, without departing from the purpose and the spirit of the present invention, can make various modifications and replacements to the present invention.

[0030] Experimental methods used in the below-mentioned embodiments, unless otherwise specifically illustrated, are all conventional methods.

[0031] Materials, reagents, and the like used in the below-mentioned embodiments, unless otherwise specifically illustrated, all can be obtained by commercial approaches.

Embodiment 1

[0032] By taking an ecological floating island with an area of 25 m.sup.2 in a 10 m*10 m closed water body region as an example, water quality is class-IV water, Chemical Oxygen Demand (COD) is 60 mg/L, a water volume is 500 m.sup.3/d, field power supply capacity is poor, the ecological floating island is planted with emergent aquatic plants including lotuses, typha orientalis and scirpus validus vahl, a plant density ratio is 5:1:1, a permanent magnetic type magnetization reactor made of a ferrite material is adopted, magnetic field intensity is 400 mT, intermittent magnetization induction is carried out, an intermittent period is 5 h, and one-time magnetization time is 20 min. Water quality measurement is carried out after 10 days, 30 days, 50 days and 70 days, and a measurement method includes:

[0033] Taking water samples on the tenth day, the thirtieth day, the fiftieth day and the seventieth day, and carrying out measurement on COD of the water samples according to a dichromate measurement method (GB11914-89) of the COD.

[0034] A result shows that the COD is respectively reduced to 28 mg/L, 25 mg/L, 21 mg/L and 17 mg/L, and reaches the class-III water standard after 70 days.

CONTRAST EXAMPLE 1A

[0035] This contrast example differs from Embodiment 1 in that: magnetization induction is not carried out on the ecological floating island, and the water quality is restored only by the ecological floating island and the planted emergent aquatic plants.

[0036] Measurement of the water quality and the plants is respectively carried out after 10 days, 30 days, 50 days and 70 days, and a result shows that the COD is respectively reduced to 45 mg/L, 37 mg/L, 35 mg/L and 32 mg/L, and reaches the class-IV water standard after 70 days.

CONTRAST EXAMPLE 1B

[0037] This contrast example differs from Embodiment 1 in that: the emergent aquatic plants are not planted on the ecological floating island.

[0038] The water quality is restored by the ecological floating island and the intermittent magnetization effect.

[0039] Measurement of the water quality and the plants is respectively carried out after 10 days, 30 days, 50 days and 70 days, and a result shows that the COD is respectively reduced to 58 mg/L, 56 mg/L, 51 mg/L and 48 mg/L, and reaches the class-V water standard after 70 days.

Embodiment 2

[0040] By taking an ecological floating island with an area of 25 m.sup.2 in a 10 m*10 m closed water body region as an example, water quality is class-IV water, COD is 60 mg/L, a water volume is 500 m.sup.3/d, field power supply capacity is poor, the ecological floating island is planted with emergent aquatic plants including acorns calamus linn, cortaderia selloana and sparganium stoloniferum, a plant density ratio is 1:1:1, a permanent magnetic type magnetization reactor made of a ferrite material is adopted, magnetic field intensity is 200 mT, intermittent magnetization induction is carried out, an intermittent period is 15 h, and one-time magnetization time is 60 min. Water quality measurement is carried out after 10 days, 30 days, 50 days and 70 days, and a result shows that the COD is respectively reduced to 25 mg/L, 25 mg/L, 20 mg/L and 19 mg/L, and reaches the class-III water standard after 70 days.

CONTRAST EXAMPLE 2A

[0041] This contrast example differs from Embodiment 2 in that: magnetization induction is not carried out on the ecological floating island, and the water quality is restored only by the ecological floating island and the planted emergent aquatic plants.

[0042] Measurement of the water quality and the plants is respectively carried out after 10 days, 30 days, 50 days and 70 days, and a result shows that the COD is respectively reduced to 46 mg/L, 38 mg/L, 35 mg/L and 32 mg/L, and reaches the class-IV water standard after 70 days.

CONTRAST EXAMPLE 2B

[0043] This contrast example differs from Embodiment 2 in that: the emergent aquatic plants are not planted on the ecological floating island.

[0044] The water quality is restored by the ecological floating island and the intermittent magnetization effect.

[0045] Measurement of the water quality and the plants is respectively carried out after 10 days, 30 days, 50 days and 70 days, and a result shows that the COD is respectively reduced to 58 mg/L, 56 mg/L, 51 mg/L and 48 mg/L, and reaches the class-V water standard after 70 days.

Embodiment 3

[0046] By taking an ecological floating island with an area of 25 m.sup.2 in a 10 m*10 m closed water body region as an example, water quality is class-IV water, COD is 60 mg/L, a water volume is 500 m.sup.3/d, field power supply capacity is poor, the ecological floating island is planted with emergent aquatic plants including typha angustifolia, bowl lotuses and phragmites australis, a plant density ratio is 1:2:1, a permanent magnetic type magnetization reactor made of a ferrite material is adopted, magnetic field intensity is 100 mT, intermittent magnetization induction is carried out, an intermittent period is 30 h, and one-time magnetization time is 90 min. Water quality measurement is carried out after 10 days, 30 days, 50 days and 70 days, and a result shows that the COD is respectively reduced to 28 mg/L, 25 mg/L, 21 mg/L and 17 mg/L, and reaches the class-III water standard after 70 days.

CONTRAST EXAMPLE 3A

[0047] This contrast example differs from Embodiment 3 in that: magnetization induction is not carried out on the ecological floating island, and the water quality is restored only by the ecological floating island and the planted emergent aquatic plants.

[0048] Measurement of the water quality and the plants is respectively carried out after 10 days, 30 days, 50 days and 70 days, and a result shows that the COD is respectively reduced to 46 mg/L, 38 mg/L, 35 mg/L and 32 mg/L, and reaches the class-IV water standard after 70 days.

CONTRAST EXAMPLE 3B

[0049] This contrast example differs from Embodiment 2 in that: the emergent aquatic plants are not planted on the ecological floating island.

[0050] The water quality is restored by the ecological floating island and the intermittent magnetization effect.

[0051] Measurement of the water quality and the plants is respectively carried out after 10 days, 30 days, 50 days and 70 days, and a result shows that the COD is respectively reduced to 58 mg/L, 56 mg/L, 51 mg/L and 48 mg/L, and reaches the class-V water standard after 70 days.

CONTRAST EXAMPLE 4

[0052] By taking an ecological floating island with an area of 25 m.sup.2 in a 10 m*10 m closed water body region as an example, the water quality is class-IV water. COD is 50 mg/L. A water volume is 500 m.sup.3/d. The field power supply capacity is poor. The ecological floating island is planted with emergent aquatic plants including wild rice shoots, phragmites australis, and cress. A plant density ratio is 2:2:1. A permanent magnetic type magnetization reactor made of a ferrite material is adopted. The magnetic field intensity is 400 Mt. Intermittent magnetization induction is carried out. An intermittent period is 5 h. One-time magnetization time is 20 min. Water quality measurement is carried out after 10 days, 30 days, 50 days and 70 days, and a measurement method includes:

[0053] Taking water samples on the tenth day, the thirtieth day, the fiftieth day and the seventieth day, and carrying out the measurement on COD of the water samples according to a dichromate measurement method (GB11914-89) of the COD.

[0054] Measurement of the water quality and the plants is respectively carried out after 10 days, 30 days, 50 days and 70 days, and a result shows that the COD is respectively reduced to 44 mg/L, 35 mg/L, 31 mg/L and 31 mg/L, and reaches the class-IV water standard after 70 days.

[0055] Although the present invention has been described above in great detail with general descriptions and specific embodiments, on the basis of the present invention, various modifications or improvements may be made, which is apparent to those of ordinary skill in the art. Therefore, all such modifications and improvements without departing from the spirit of the present invention are within the scope of the claims of the present invention.