CN114956339A - Micro-plastic algae removal bed based on benthic filamentous green algae, and method and application thereof - Google Patents
Micro-plastic algae removal bed based on benthic filamentous green algae, and method and application thereof Download PDFInfo
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- CN114956339A CN114956339A CN202110221756.9A CN202110221756A CN114956339A CN 114956339 A CN114956339 A CN 114956339A CN 202110221756 A CN202110221756 A CN 202110221756A CN 114956339 A CN114956339 A CN 114956339A
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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
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
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Abstract
The invention is suitable for the technical field of ecological restoration, and provides a micro-plastic algae removal bed based on benthic filamentous green algae, and a method and application thereof. A micro plastic algae removing bed based on benthic filamentous green algae comprises a plurality of net curtains arranged at intervals; the net curtain is fixed at the bottom of the riverbed through a fixing steel groove; the net curtain is formed by fixedly connecting a plurality of criss-cross steel bar frameworks; and the reinforcing steel bar framework is wound with rough hemp ropes as a matrix. According to the invention, the strong trapping capacity of benthic filamentous green algae on the micro-plastics is utilized, the high-efficiency algae bed is constructed in situ in the river channel, and the micro-plastics in the river water are efficiently collected while nitrogen and phosphorus are effectively absorbed, so that the aims of bio-concentrating the micro-plastics and reducing the abundance of the micro-plastics in the water environment are achieved; and all materials of the algae bed are not made of plastic products, so that new plastic pollutants can be prevented from being introduced.
Description
Technical Field
The invention belongs to the technical field of ecological restoration, and particularly relates to a micro-plastic algae removal bed based on benthic filamentous green algae, and a method and application thereof.
Background
In recent years, micro-plastics (plastic particles with a diameter of less than 5mm) have gained extensive research and attention as an emerging pollutant. Compared with large plastics, the micro plastics (Microplastics) have smaller particle size and larger specific surface area, can adsorb and carry more toxic substances, such as heavy metals, persistent organic pollutants and the like, and have negative effects on the physiological functions of aquatic organisms. Thus, micro-plastics have become a potentially significant challenge for global environments and ecosystems, referred to as "PM 2.5" for aqueous environments.
At present, the research on the micro-plastics at home and abroad mainly focuses on the toxicological and ecological effects of aquatic organisms, and the exploration stage of how to effectively remove the micro-plastics in natural water is always in place. Few technologies focus on the research of the degradation mechanism of the periphyton membrane on the micro-plastics, but the degradation efficiency is low (below 30%), the types of the acting plastics are limited, and the removal requirement of the micro-plastics in the actual water environment cannot be effectively met. And the flocculation precipitation filtration and other technologies are only partially tested in sewage treatment plants, and cannot be effectively popularized and applied to large water bodies such as river channels and the like. Therefore, it is necessary to develop an ecological treatment technology which has a broad-spectrum removal effect on the micro-plastics in the river and is environmentally friendly, safe and reliable.
Benthic filamentous green algae (cladophora, dictyophyta, spirogyra, and the like) are widely present in shallow lakes and rivers. The benthic filamentous green algae can adapt to the environment with low light intensity better than floating algae, thereby having strong competitiveness; meanwhile, the growth and the nitrogen and phosphorus uptake rate are high, and the concentration of organic matters in water is reduced; under a suitable temperature climate, benthic filamentous green algae can grow all the year round; the benthic filamentous green algae are large algae and are not easy to run off along with water; in addition, the harvesting can be operated in a large amount in a pasture mode; the benthic filamentous green algae can grow rapidly on the surface of the sediment, thereby reducing the resuspension of particles, micro-plastics and the like caused by disturbance.
Disclosure of Invention
The embodiment of the invention aims to provide a micro-plastic algae removal bed based on benthic filamentous green algae, a method and application thereof, and aims to solve the problems in the prior art pointed out in the background art.
The embodiment of the invention is realized in such a way that the micro-plastic algae removal bed based on benthic filamentous green algae comprises a plurality of net curtains which are arranged at intervals;
the net curtain is fixed at the bottom of the riverbed through a fixed steel groove;
the net curtain is formed by fixedly connecting a plurality of criss-cross steel bar frameworks;
and the reinforcing steel bar framework is wound with rough hemp ropes as a matrix.
As another preferred embodiment of the present invention, said benthic filamentous green algae are selected from the phylum Chlorophyta, the genus Cladophora and the genus spirogyra, or a combination of both.
As another preferable scheme of the embodiment of the invention, two sides of the net curtain are respectively clamped in the fixing steel grooves, and each fixing steel groove comprises two fixing ribs which are provided with gaps and are fixed at the bottom of the riverbed.
As another preferable scheme of the embodiment of the invention, the spacing distance between the adjacent net curtains is 0.4-0.6 m.
As another preferable scheme of the embodiment of the invention, the hemp rope is woven by degradable jute or kenaf fiber; the diameter of the hemp rope is 10-20 mm.
As another preferred scheme of the embodiment of the invention, the diameter of the steel bar framework is 5-7 mm; the spacing distance between adjacent transverse steel reinforcement frameworks is 18-22 cm; the spacing distance between adjacent longitudinal steel reinforcement frameworks is 18-22 cm.
As another preferable scheme of the embodiment of the invention, the width of the net curtain is 0.8-1.2 m.
As another preferable scheme of the embodiment of the invention, hanging rings are welded at two ends of the top of the net curtain.
Another object of an embodiment of the present invention is to provide a method for removing micro-plastics based on benthic filamentous green algae, comprising the steps of:
the net for hanging benthic filamentous green algae comprises the following steps:
placing the net curtain in the plastic algae removal bed based on the benthic filamentous green algae in an area rich in the benthic filamentous green algae for soaking for 5-15 days;
when green filiform green algae are attached to the surface of the hemp rope, the net curtain is taken out and fixed at the bottom of the river bed through the fixing steel groove, and the growth of the benthic filiform green algae on the net curtain is promoted by utilizing nutrient substances in the river flowing water;
the cleaning of benthic filamentous green algae comprises the following steps:
when the length of the benthic filamentous green algae reaches 30-50 cm, taking out the net curtain at intervals;
manually cleaning the floating algae on the net curtain until a layer of green algae film is left on the hemp rope, and then putting the net curtain back into the fixed steel tank again to enable the benthic filamentous green algae to continue to grow until the next cleaning.
Another object of an embodiment of the present invention is to provide an application of a micro plastic algae removal bed based on benthic filamentous green algae in removing micro plastic in water.
The urban river channel can promote the rapid growth of benthic filamentous green algae due to rich nitrogen and phosphorus nutrient salts, the algae grows continuously, accompanying thalli, microorganisms and the like are added, the urban river channel has a good adsorption effect on fine micro-plastics, the urban river channel can be harvested for many times, the algae and the micro-plastics are continuously removed, the content of nitrogen and phosphorus in the water body is reduced, and the common control of the nitrogen and phosphorus and the micro-plastics is realized.
According to the invention, the strong trapping capacity of benthic filamentous green algae on the micro-plastics is utilized, the high-efficiency algae bed is constructed in situ in the river channel, and the micro-plastics in river water are efficiently collected while nitrogen and phosphorus are effectively absorbed, so that the aims of bio-concentrating the micro-plastics and reducing the abundance of the micro-plastics in the water environment are achieved; and all materials of the algae bed are not made of plastic products, so that new plastic pollutants can be prevented from being introduced.
Drawings
FIG. 1 is a schematic view of a micro plastic algal removal bed based on benthic filamentous green algae;
FIG. 2 is a schematic view of a screen structure;
in the drawings: 1-hemp rope, 2-steel reinforcement framework, 3-fixed steel groove and 4-hanging ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Specific implementations of the present invention are described in detail below with reference to specific embodiments.
Example 1
As shown in FIGS. 1-2, the embodiment provides a micro plastic algae removal bed based on benthic filamentous green algae, comprising a plurality of spaced-apart net curtains;
the net curtain is fixed at the bottom of the riverbed through a fixed steel groove 3; the two sides of the net curtain are respectively provided with a fixed steel groove 3, the fixed steel grooves 3 comprise two fixed ribs fixed at the bottom of a riverbed, a gap slightly larger than the diameter of the steel bar framework 2 is formed between the two fixed ribs, and the distance between the fixed steel grooves 3 at the two sides of each net curtain is smaller than the width of the net curtain, so that the net curtain can be clamped in the fixed steel grooves 3 at the two sides, the net curtain can also be lifted out of the water surface from the fixed steel grooves 3 at the two sides, and the mixture of benthic filamentous green algae and micro plastics bred on the net curtain is periodically cleaned;
the spacing distance between the adjacent net curtains is 0.4 m;
the net curtain is formed by welding a plurality of criss-cross steel bar frameworks 2; the diameter of the steel bar framework 2 is 5 mm; the spacing distance between adjacent transverse steel reinforcement frameworks 2 is 18 cm; the spacing distance between adjacent longitudinal steel reinforcement frameworks 2 is 18 cm;
the reinforcing steel bar framework 2 is wound with rough hemp ropes 1 as a matrix, so that filamentous algae can conveniently land; the hemp rope 1 is woven by degradable jute or hibiscus hemp and other plant fibers; the diameter of the hemp rope is 10 mm;
the width of the net curtain is 0.8m, and the height of the net curtain is determined according to the depth of the normal water level of the river channel;
both ends of the top of the net curtain are welded with hanging rings 4, so that the net curtain can be conveniently lifted out of the water.
Example 2
As shown in FIGS. 1-2, the embodiment provides a micro plastic algae removal bed based on benthic filamentous green algae, comprising a plurality of spaced-apart net curtains;
the net curtain is fixed at the bottom of the riverbed through a fixed steel groove 3; the two sides of the net curtain are respectively provided with a fixed steel groove 3, the fixed steel grooves 3 comprise two fixed ribs fixed at the bottom of a riverbed, a gap slightly larger than the diameter of the steel bar framework 2 is formed between the two fixed ribs, and the distance between the fixed steel grooves 3 at the two sides of each net curtain is smaller than the width of the net curtain, so that the net curtain can be clamped in the fixed steel grooves 3 at the two sides, the net curtain can also be lifted out of the water surface from the fixed steel grooves 3 at the two sides, and the mixture of benthic filamentous green algae and micro plastics bred on the net curtain is periodically cleaned;
the spacing distance between the adjacent net curtains is 0.6 m;
the net curtain is formed by welding a plurality of criss-cross steel bar frameworks 2; the diameter of the steel bar framework 2 is 7 mm; the spacing distance between adjacent transverse steel reinforcement frameworks 2 is 22 cm; the spacing distance between adjacent longitudinal steel reinforcement frameworks 2 is 22 cm;
the reinforcing steel bar framework 2 is wound with rough hemp ropes 1 as a matrix, so that filamentous algae can conveniently land; the hemp rope 1 is woven by degradable jute or hibiscus hemp and other plant fibers; the diameter of the hemp rope is 20 mm;
the width of the net curtain is 1.2m, and the height of the net curtain is determined according to the depth of the normal water level of the river channel;
both ends of the top of the net curtain are welded with hanging rings 4, so that the net curtain can be conveniently lifted out of the water.
Example 3
As shown in FIGS. 1-2, the embodiment provides a micro plastic algae removal bed based on benthic filamentous green algae, comprising a plurality of spaced-apart net curtains;
the net curtain is fixed at the bottom of the riverbed through a fixed steel groove 3; the two sides of the net curtain are respectively provided with a fixed steel groove 3, the fixed steel grooves 3 comprise two fixed ribs fixed at the bottom of a riverbed, a gap slightly larger than the diameter of the steel bar framework 2 is formed between the two fixed ribs, and the distance between the fixed steel grooves 3 at the two sides of each net curtain is smaller than the width of the net curtain, so that the net curtain can be clamped in the fixed steel grooves 3 at the two sides, the net curtain can also be lifted out of the water surface from the fixed steel grooves 3 at the two sides, and the mixture of benthic filamentous green algae and micro plastics bred on the net curtain is periodically cleaned;
the spacing distance between the adjacent net curtains is 0.5 m;
the net curtain is formed by welding a plurality of criss-cross steel bar frameworks 2; the diameter of the steel bar framework 2 is 6 mm; the spacing distance between adjacent transverse steel reinforcement frameworks 2 is 20 cm; the spacing distance between adjacent longitudinal steel reinforcement frameworks 2 is 20 cm;
the reinforcing steel bar framework 2 is wound with rough hemp ropes 1 as a matrix, so that filamentous algae can conveniently land; the hemp rope 1 is woven by degradable jute, hibiscus hemp and other plant fibers; the diameter of the hemp rope is 15 mm;
the width of the net curtain is 1m, and the height of the net curtain is determined according to the depth of the normal water level of the river channel;
both ends of the top of the net curtain are welded with hanging rings 4, so that the net curtain can be conveniently lifted out of the water.
The filamentous benthic chlorella is selected from Cladophora and/or spirogyra of Chlorophyceae.
Example 4
As shown in FIGS. 1-2, the embodiment provides a micro-plastic algae removal bed based on benthic filamentous green algae, comprising a plurality of spaced net curtains;
the net curtain is fixed at the bottom of the riverbed through a fixed steel groove 3; the two sides of the net curtain are respectively provided with a fixed steel groove 3, the fixed steel grooves 3 comprise two fixed ribs fixed at the bottom of a riverbed, a gap slightly larger than the diameter of the steel bar framework 2 is formed between the two fixed ribs, and the distance between the fixed steel grooves 3 at the two sides of each net curtain is smaller than the width of the net curtain, so that the net curtain can be clamped in the fixed steel grooves 3 at the two sides, the net curtain can also be lifted out of the water surface from the fixed steel grooves 3 at the two sides, and the mixture of benthic filamentous green algae and micro plastics bred on the net curtain is periodically cleaned;
the spacing distance between the adjacent net curtains is 0.55 m;
the net curtain is formed by welding a plurality of criss-cross steel bar frameworks 2; the diameter of the steel bar framework 2 is 6.2 mm; the spacing distance between adjacent transverse steel reinforcement frameworks 2 is 21 cm; the spacing distance between adjacent longitudinal steel reinforcement frameworks 2 is 19 cm;
the reinforcing steel bar framework 2 is wound with rough hemp ropes 1 as a matrix, so that filamentous algae can conveniently land; the hemp rope 1 is woven by degradable jute or hibiscus hemp and other plant fibers; the diameter of the hemp rope is 14 mm;
the width of the net curtain is 1.1m, and the height of the net curtain is determined according to the depth of the normal water level of the river channel;
both ends of the top of the net curtain are welded with hanging rings 4, so that the net curtain can be conveniently lifted out of the water.
Example 5
This embodiment provides a method for removing micro-plastics based on benthic filamentous green algae, comprising the steps of:
(1) net for hanging benthic filamentous green algae
The mesh curtain in the plastic removal algae bed based on the benthic filamentous green algae described in the example 1 is placed in an area rich in the benthic filamentous green algae and soaked for 5 days;
when green filiform green algae are attached to the surface of the hemp rope, the net curtain is taken out and fixed at the bottom of the river bed through the fixing steel groove, and the growth of the benthic filiform green algae on the net curtain is promoted by utilizing nutrient substances in the river flowing water;
(2) cleaning of benthic filamentous green algae
After the benthic filamentous green algae are hung on the net, under the stimulation of rich nutrient substances in river water, the growth speed of the green algae is accelerated, and when the length of the benthic filamentous green algae reaches 30cm, the net curtain is taken out at intervals;
manually cleaning the algae floating on the net curtain, after cleaning until a layer of green algae film is left on the hemp rope, putting the net curtain back to the fixed steel tank again to enable the benthic filamentous green algae to continue to grow until the next cleaning.
Example 6
This embodiment provides a method for removing micro-plastics based on benthic filamentous green algae, comprising the steps of:
(1) net for hanging benthic filamentous green algae
Placing the net curtain in the plastic removal algae bed based on the benthic filamentous green algae described in the example 2 in an area rich in the benthic filamentous green algae for soaking for 15 days;
when green filiform green algae are attached to the surface of the hemp rope, the net curtain is taken out and fixed at the bottom of the river bed through the fixing steel groove, and the growth of the benthic filiform green algae on the net curtain is promoted by utilizing nutrient substances in the river flowing water;
(2) cleaning of benthic filamentous green algae
After the benthic filamentous green algae are hung on the net, under the stimulation of rich nutrient substances in river water, the growth speed of the green algae is accelerated, and when the length of the benthic filamentous green algae reaches 50cm, the net curtain is taken out at intervals;
manually cleaning the algae floating on the net curtain, after cleaning until a layer of green algae film is left on the hemp rope, putting the net curtain back to the fixed steel tank again to enable the benthic filamentous green algae to continue to grow until the next cleaning.
Example 7
This embodiment provides a method for removing micro-plastics based on benthic filamentous green algae, comprising the steps of:
(1) net for hanging benthic filamentous green algae
Placing the net curtain in the micro-plastic algae removal bed based on the benthic filamentous green algae, which is described in the embodiment 3, in an area rich in the benthic filamentous green algae for soaking for 10 days;
when green filiform green algae are attached to the surface of the hemp rope, the net curtain is taken out and fixed at the bottom of the river bed through the fixing steel groove, and the growth of the benthic filiform green algae on the net curtain is promoted by utilizing nutrient substances in the river flowing water;
(2) cleaning of benthic filamentous green algae
After the benthic filamentous green algae are hung on the net, under the stimulation of rich nutrient substances in river water, the growth speed of the green algae is accelerated, and when the length of the benthic filamentous green algae reaches 40cm, the net curtain is taken out at intervals;
manually cleaning the algae floating on the net curtain, after cleaning until a layer of green algae film is left on the hemp rope, putting the net curtain back to the fixed steel tank again to enable the benthic filamentous green algae to continue to grow until the next cleaning.
Example 8
This embodiment provides a method for removing micro-plastics based on benthic filamentous green algae, comprising the steps of:
(1) net for hanging benthic filamentous green algae
Placing the net curtain in the plastic removal algae bed based on the benthic filamentous green algae described in the example 4 in an area rich in the benthic filamentous green algae for soaking for 9 days;
when green filiform green algae are attached to the surface of the hemp rope, the net curtain is taken out and fixed at the bottom of the river bed through the fixing steel groove, and the growth of the benthic filiform green algae on the net curtain is promoted by utilizing nutrient substances in the river flowing water;
(2) cleaning of benthic filamentous green algae
After the benthic filamentous green algae are hung on the net, under the stimulation of rich nutrient substances in river water, the growth speed of the green algae is accelerated, and when the length of the benthic filamentous green algae reaches 38cm, the net curtain is taken out at intervals;
manually cleaning the floating algae on the net curtain until a layer of green algae film is left on the hemp rope, and then putting the net curtain back into the fixed steel tank again to enable the benthic filamentous green algae to continue to grow until the next cleaning.
Experimental example 1
Taking the treatment effect of a river in Zhejiang as an example, the average depth of the river is 1m, the flow rate is 0.21m/s, and the water temperature is 18 ℃. The water quality indexes of the river channel comprise transparency, dissolved oxygen, total phosphorus and total nitrogen content, and are measured according to a national standard method, and specific values are shown in table 1.
TABLE 1 river Water quality index determination
Placing the net curtain in a region with rich benthic algae in a clear water area in a river channel, and soaking for 10 days to form a green filamentous algae film on the hemp ropes of the net curtain; the net curtains are placed in a riverway treatment area, the length of the area is 20m, and the interval distance between the net curtains is 0.5 m. The width of the net curtain is 1m, and the height of the net curtain is 1 m; the width of the river channel is 6.8m, and 6 net curtains are transversely arranged.
30 days after the curtain green filamentous algae film is formed, the content of the micro-plastics in the water and the benthic filamentous algae aggregates is measured. The related determination method is determined according to the method provided by the literature (Zhao Xin et al 2020, the pollution status and pollution behavior [ J ] of the micro plastic in the surface water and sediment of urban riverways), the plastic with the particle size larger than 5mm is selected by a visual method, and various indexes are shown in Table 2.
TABLE 2 Plastic concentrations (containing micro-plastic and large plastic particles) in the water and filamentous algae before and after treatment
Experimental example 2
Taking the treatment effect of a river channel in Shandong as an example, the average depth of the river channel is 1.5m, the flow rate is 0.12m/s, and the water temperature is 15 ℃. The water quality indexes of the river channel, including transparency, dissolved oxygen, total phosphorus and total nitrogen content, are measured according to a national standard method, and specific values are shown in table 3.
TABLE 3 river course water quality index determination
| Index (I) | Transparency cm | Dissolved oxygen mg/L | Total phosphorus mg/L | Total nitrogen mg/L |
| Numerical value | 96 | 4.9 | 0.10 | 1.81 |
Placing the net curtain in a region with abundant benthic algae in a clear water area in a river channel, and soaking for 15 days to form a green filamentous algae film on the hemp ropes of the net curtain; the net curtains are placed in a riverway treatment area, the length of the area is 20m, and the interval distance between the net curtains is 0.5 m. The width of the net curtain is 1m, and the height of the net curtain is 1.5 m; the width of the river channel is 10.4m, and 10 net curtains are transversely arranged.
30 days after the curtain green filamentous algae film is formed, the content of the micro-plastics in the water and the benthic filamentous algae aggregates is measured. The related determination method is determined according to the method provided by the literature (Zhao Xin et al 2020, the pollution status and pollution behavior [ J ] of the micro plastic in the surface water and sediment of urban riverways), the plastic with the particle size larger than 5mm is selected by a visual method, and various indexes are shown in Table 4.
TABLE 4 Plastic concentrations (containing micro-plastic and large plastic particles) in the water and filamentous algae before and after treatment
| Index (es) | Concentration of micro-plastics in water before placing algae bed | Micro-plastic concentration of water body after placing algae bed | Plastic concentration in filamentous algae aggregates |
| Concentration value | 0.011 +/-0.028/g | 0.006 +/-0.009 pieces/g | 9.1 +/-8.8/g |
According to the experimental examples 1-2, the invention utilizes the growth of benthic filamentous green algae to convert pollutants such as nitrogen and phosphorus in water into self tissues, and simultaneously, dense and bulky filaments capture micro-plastics floating in water, so that the reduction of plastics in the water body is realized, and finally, the reduction of plastic pollutants in the water environment in a river is realized.
In the riverway water body restoration project, a large number of plastic particles are enriched in benthic filamentous green alga aggregations grown and propagated on the bottom of a riverway through the actions of winding, wrapping, adsorption and the like, through sampling analysis, the average abundance of the plastic particles in the alga is 10.4 +/-6.3 pieces/(g fresh weight), the average abundance of the micro-plastics in the peripheral river water is 0.007 +/-0.009 pieces/g, and the abundance of the micro-plastics in the alga is about 1485 times of the abundance of the micro-plastics in the peripheral river water. Through analysis, in all plastic particles collected by benthic filamentous green algae, the proportion of micro-plastics (the particle size is less than or equal to 5mm) is 67.4%, and the proportion of large and medium plastics (the particle size is more than 5mm) is 32.6%. From the shape classification, the fibrous micro plastic accounts for 78%; 12% foam, 6% film, 3.2% chips and 0.8% microbeads. And the existence of the micro plastic is found to have no adverse effect on the growth of filamentous algae and have stronger tolerance. Therefore, in view of the strong absorption characteristic of the benthic filamentous green algae on nutrient substances, the outstanding trapping capacity and high tolerance on the micro-plastics, the benthic filamentous green algae can be used as an excellent biological repair material for reducing the micro-plastics in water, and an efficient algae bed area is constructed in situ to reduce the abundance of the micro-plastics in the water body. The method has high ecological safety, can convert nitrogen and phosphorus pollutants in the water body into biological materials for trapping the micro-plastics in situ, and avoids the introduction of new artificial engineering enrichment materials to cause potential pollution hidden troubles to the river. The benthic filamentous green algae are periodically harvested to realize the transfer of nitrogen and phosphorus nutrient salts and the effective removal of micro-plastics.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A micro plastic algae removing bed based on benthic filamentous green algae is characterized by comprising a plurality of net curtains which are arranged at intervals;
the net curtain is fixed at the bottom of the riverbed through a fixing steel groove;
the net curtain is formed by fixedly connecting a plurality of criss-cross steel bar frameworks;
and the reinforcing steel bar framework is wound with rough hemp ropes as a matrix.
2. The micropost plastic algal removal bed of claim 1, wherein the filamentous algae are selected from the phylum Chlorophyceae, Cladophora and spirogyra, or a combination of both.
3. The micropost algal removal bed according to claim 1, wherein the two sides of the net curtain are respectively clamped in a fixing steel groove, and the fixing steel groove comprises two fixing ribs with gaps and fixed at the bottom of the river bed.
4. The micropolastic benthic chlorella-based algae removal bed according to claim 1, wherein the distance between adjacent screens is 0.4 to 0.6 m.
5. The micro plastic algal removal bed based on benthic filamentous green algae according to claim 1, wherein the hemp rope is woven with degradable jute or kenaf fiber; the diameter of the hemp rope is 10-20 mm.
6. The micro plastic algal removal bed based on benthic filamentous green algae according to claim 1, wherein the steel reinforcement cage has a diameter of 5 to 7 mm; the spacing distance between adjacent transverse steel reinforcement frameworks is 18-22 cm; the spacing distance between adjacent longitudinal steel reinforcement frameworks is 18-22 cm.
7. The micro plastic algal removal bed based on benthic filamentous green algae according to claim 1, wherein the width of the net curtain is 0.8 to 1.2 m.
8. The micro plastic algal removal bed based on benthic filamentous green algae according to claim 1, wherein hanging rings are welded to both ends of the top of the net curtain.
9. A method for removing micro-plastics based on benthic filamentous green algae is characterized by comprising the following steps:
the net for hanging benthic filamentous green algae comprises the following steps:
placing the net curtain in the plastic removal algae bed based on the benthic filamentous green algae according to any one of claims 1 to 6 in an area rich in the benthic filamentous green algae for soaking for 5 to 15 days;
when green filiform green algae are attached to the surface of the hemp rope, the net curtain is taken out and fixed at the bottom of the riverbed through the fixing steel groove, and the benthic filiform green algae on the net curtain are promoted to grow by utilizing nutrient substances in the flowing water of the riverway;
the cleaning of benthic filamentous green algae comprises the following steps:
when the length of the benthic filamentous green algae reaches 30-50 cm, taking out the net curtain at intervals;
manually cleaning the floating algae on the net curtain until a layer of green algae film is left on the hemp rope, and then putting the net curtain back into the fixed steel tank again to enable the benthic filamentous green algae to continue to grow until the next cleaning.
10. Use of a micro-plastic algal removal bed based on benthic filamentous green algae according to any one of claims 1 to 8 for removing micro-plastic in water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115571988A (en) * | 2022-09-30 | 2023-01-06 | 中南林业科技大学 | Method for capturing water body micro-plastics and surface runoff water body micro-plastics in situ by using aquatic plants |
| CN117125839A (en) * | 2023-07-10 | 2023-11-28 | 中国科学院大学 | Method for removing microplastic in sewage by utilizing microalgae-fungus symbiont |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115571988A (en) * | 2022-09-30 | 2023-01-06 | 中南林业科技大学 | Method for capturing water body micro-plastics and surface runoff water body micro-plastics in situ by using aquatic plants |
| CN115571988B (en) * | 2022-09-30 | 2024-03-19 | 中南林业科技大学 | Method for capturing water body microplastic and surface runoff water body microplastic in situ by utilizing aquatic plants |
| CN117125839A (en) * | 2023-07-10 | 2023-11-28 | 中国科学院大学 | Method for removing microplastic in sewage by utilizing microalgae-fungus symbiont |
| CN117125839B (en) * | 2023-07-10 | 2024-03-26 | 中国科学院大学 | Method for removing microplastic in sewage by utilizing microalgae-fungus symbiont |
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