Iron-carbon micro-electrolysis coupled with artificial floating island of floating plants and use method

Abstract

The application discloses an iron-carbon micro-electrolysis coupled artificial floating island of floating aquatic plants and a use method, and relates to the technical field of water purification. The artificial floating island comprises a floating plate, a plurality of iron-carbon micro-electrolysis cavities which are arranged at equal intervals below the floating plate, and a plurality of iron-carbon micro-electrolysis plates which are arranged at equal intervals below the floating plate; and the iron-carbon micro-electrolysis cavities and the iron-carbon micro-electrolysis plates are arranged in an alternating manner. The use method comprises the following steps: S1, iron-carbon micro-electrolysis plate preparation; S2, artificial floating island construction; and S3, cyclic repair. The application uses sponge iron and activated carbon as raw materials, realizes iron-carbon micro-electrolysis technology for treating pollutants and adsorbing heavy metals in water, forms an artificial floating island with double purification functions, reduces the content of heavy metals in water, and has higher treatment efficiency and uses less raw materials compared with a simple iron-carbon micro-electrolysis floating island.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to an artificial floating island composed of iron-carbon micro-electrolysis coupled with floating aquatic plants and its usage method. Background Technology

[0002] Heavy metal pollution in freshwater environments has seriously affected the safety and quality of freshwater aquaculture areas and aquatic products. Heavy metals are accumulative in organisms, have long half-lives, and can cause teratogenicity, carcinogenicity, and mutagenicity. Excessive heavy metals in water bodies not only deteriorate water quality and affect the growth and reproduction of freshwater aquatic organisms such as fish, shrimp, and crabs, but also accumulate in the food chain. In humans, the accumulation of heavy metals can damage various organs, blood vessels, and the nervous system. Heavy metal emissions and their resulting environmental impacts have become a global environmental problem. This technology can be used for the prevention, control, and remediation of tailings ponds, industrial circulating water tanks, and natural water environments with high levels of heavy metal ions.

[0003] Tailings ponds are constructed by damming valleys or enclosing land to store tailings or other industrial waste discharged after ore beneficiation in metal or non-metal mines. Mineral processing plants are major water consumers, typically requiring 4-6 tons of water to process one ton of raw ore, and sometimes as much as 10-20 tons in gravity separation. This water is discharged into tailings ponds along with the tailings. After clarification and natural purification, most of the water can be reused in mineral processing. However, there is no specific treatment process for heavy metal ions in tailings ponds. Circulating water tanks are mainly used to store cooling water required for heat exchange in equipment, serving functions of circulation, cooling (cooling tower), and storage. In the metallurgical, electroplating, and steel smelting industries, circulating water tanks contain excessive amounts of heavy metals. To meet industrial circulating water standards, it is essential to remove heavy metal ions from the water during its use as cooling water.

[0004] Chemical precipitation and physical adsorption have great potential in treating heavy metals in water bodies. These purely physicochemical methods have high removal rates, but they are not only costly and have poor ecological benefits, but also require advanced technology and can easily cause secondary pollution to water bodies, and sometimes even damage the ecosystem. Therefore, people need a healthier, greener and safer method for heavy metal remediation.

[0005] The aforementioned problem can be solved by coupling iron-carbon micro-electrolysis technology with floating plants to absorb heavy metals in water. Compared with traditional remediation methods, using aquatic plants to remediate heavy metals in water is considered to have good application prospects. When hydroponic plants grow, their roots adsorb and migrate heavy metals in the water. By harvesting the aquatic plants regularly, heavy metals can be removed from the water. This method has advantages such as no secondary pollution, low cost, good visual appeal, sustainability, and ease of implementation.

[0006] For example, patent CN113387504B discloses a farmland drainage ditch purification system combining an ecological floating bed and iron-carbon micro-electrolysis. The floating bed consists of a base and multiple planting baskets. Through floating plants, biofilms attached to these plants, an iron-carbon micro-electrolysis device, and submerged plants, it efficiently removes organic matter and nitrogen and phosphorus pollutants from the water using physical, chemical, and biological methods, thereby purifying farmland drainage water and reducing agricultural non-point source pollution. It also solves the problems of floating and submerged plants withering during the dry season and the oxidation and failure of the iron-carbon micro-electrolysis filler. However, this system suffers from complex replacement of the iron-carbon micro-electrolysis material and low utilization rate of this material. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides an artificial floating island composed of iron-carbon microelectrolysis coupled floating plants and a method for its use.

[0008] The technical solution of this invention is:

[0009] An artificial floating island for iron-carbon micro-electrolysis coupled with floating plants includes a float plate, a plurality of iron-carbon micro-electrolysis cavities arranged at equal intervals below the float plate, and a plurality of iron-carbon micro-electrolysis plates arranged at equal intervals below the float plate, wherein the iron-carbon micro-electrolysis cavities and the iron-carbon micro-electrolysis plates are arranged alternately.

[0010] The permeable mesh outside the iron-carbon micro-electrolysis cavity is detachably connected to the bottom of the floating plate, and several plant growth holes are provided on both sides of the surface of the floating plate corresponding to the iron-carbon micro-electrolysis cavity.

[0011] The surface of the floating plate corresponding to the iron-carbon micro-electrolysis plate is provided with a groove, and a placement rack for placing the iron-carbon micro-electrolysis plate is provided below the groove. The placement rack is detachably connected to the bottom of the floating plate.

[0012] The upper center of the float plate is provided with a crushing assembly for crushing the iron-carbon micro-electrolysis plate. The crushing assembly includes a slider that slides along the center of the float plate. The upper surface of the slider is provided with a crushing cylinder. Each side of the slider is provided with a fixed frame. The ends of the two fixed frames are fixedly connected to a stirring motor at the position directly above the slider. The output end of the stirring motor is provided with a crushing roller. The crushing roller extends into the crushing cylinder. The center of the float plate surface is provided with a through hole corresponding to each iron-carbon micro-electrolysis cavity. The bottom of the crushing cylinder is provided with a feed port that penetrates the slider and extends to the bottom of the slider.

[0013] Furthermore, the floating plate and the placement frame are made of polypropylene foam material, the permeable net is made of PE material, the iron-carbon micro-electrolysis plate has several openings on its surface, and the thickness of the iron-carbon micro-electrolysis plate is 4-6mm.

[0014] Note: Both the float and the placement frame are made of highly buoyant materials, allowing the float to float on the water surface. The openings on the surface of the iron-carbon micro-electrolysis plate can increase its specific surface area, enhance the contact effect between the wastewater and the plate, and thus improve the purification effect.

[0015] Furthermore, there are 6 to 10 placement racks, which are frame structures with several baffles evenly spaced on both sides.

[0016] Note: The baffle is designed to prevent the iron-carbon micro-electrolysis plate from detaching.

[0017] Furthermore, there are 6 to 10 iron-carbon micro-electrolysis cavities, and each side of the float plate has 3 to 6 plant growth holes corresponding to each iron-carbon micro-electrolysis cavity.

[0018] Explanation: By rationally adjusting the number of iron-carbon micro-electrolysis cavities, a balance between wastewater treatment efficiency and overall stability of the floating island can be ensured.

[0019] Furthermore, two pulleys are provided on each side of the bottom of the slider. The pulleys slide in corresponding grooves provided on the upper surface of the float plate. The grooves are interrupted at the slots, and the diameter of the pulleys is greater than the width of the slots.

[0020] Explanation: The setting of pulleys and chutes allows the crushing component to move and pass smoothly through the slot.

[0021] Furthermore, an extension plate is provided on one side of the floating plate, and a push rod motor is provided at the end of the extension plate. A telescopic rod is provided at the output end of the push rod motor, and a clamping block is provided at the end of the telescopic rod. The clamping block is clamped and fixedly connected to the bottom of one of the fixed frames. The telescopic rod is arranged parallel to the two sliding grooves, and a waterproof cover is provided on the outside of the push rod motor.

[0022] Note: The pulverizing component is slidable by a push rod motor.

[0023] Furthermore, the crushing roller is provided with several sets of blades with gradually decreasing lengths from top to bottom, and a 60-mesh screen is provided at the feed inlet.

[0024] Note: The crushed iron-carbon micro-electrolysis secondary debris that meets the requirements is leaked out through the sieve for reuse.

[0025] The method of using an artificial floating island of iron-carbon micro-electrolysis coupled floating plants as described in any of the above includes the following steps:

[0026] S1. Preparation of iron-carbon micro-electrolysis plate: Sponge iron is crushed to 3-5 mm to obtain sponge iron powder, and activated carbon is crushed to 2-3 mm to obtain activated carbon powder. The sponge iron powder, the activated carbon powder, and environmentally friendly adhesive are mixed in a mass ratio of 1-2:2-3:0.5-1 to obtain mixed powder. The mixed powder is placed in a mold and then heated and kept at 120-140℃ for 2-3 hours. After taking it out, the iron-carbon micro-electrolysis plate is obtained.

[0027] S2. Construction of artificial floating islands: The floating plate is placed in the sewage to be treated, and the iron-carbon micro-electrolysis plate is evenly placed in each of the placement racks. The sponge iron and activated carbon inside the iron-carbon micro-electrolysis plate form a galvanic cell to oxidize, flocculate and adsorb the heavy metals in the sewage.

[0028] S3, Cyclic Repair:

[0029] S3-1: After the iron-carbon micro-electrolysis plate is placed in the sewage for 2 to 3 months, the iron-carbon micro-electrolysis plate is taken out and crushed by the crushing component to obtain iron-carbon micro-electrolysis secondary debris. The crushed iron-carbon micro-electrolysis secondary debris in each of the placement racks is added into the corresponding through hole through the feeding port and falls into the corresponding iron-carbon micro-electrolysis cavity. Aquatic plants are planted at each of the plant growth holes and fixed with iron-carbon micro-electrolysis secondary debris. The new iron-carbon micro-electrolysis plate is placed in the placement rack for the next cycle of sewage remediation.

[0030] S3-2: Two to three months after the next cycle of wastewater remediation, the secondary iron-carbon micro-electrolysis debris in the iron-carbon micro-electrolysis cavity is removed. At the same time, the iron-carbon micro-electrolysis plate is removed, crushed, and placed in the iron-carbon micro-electrolysis cavity. Aquatic plants are harvested, and aquatic plants are planted again at each of the plant growth holes and fixed with secondary iron-carbon micro-electrolysis debris. The new iron-carbon micro-electrolysis plate is placed in the placement rack to achieve wastewater circulation remediation.

[0031] Furthermore, the environmentally friendly adhesive is an isocyanate adhesive, and the aquatic plant is one or more of the following: Siberian iris, water hyacinth, sedum, pennywort, yellow iris, and sweet flag.

[0032] The beneficial effects of this invention are:

[0033] (1) The artificial floating island of the present invention, which is a coupling of iron-carbon micro-electrolysis and floating plants, uses sponge iron and activated carbon as raw materials to realize the treatment of pollutants in water and adsorption of heavy metals by iron-carbon micro-electrolysis technology. It does not consume electricity resources and reduces technical costs. The iron-carbon micro-electrolysis technology is coupled with floating plants to form an artificial floating island with dual purification functions. The large specific surface area of ​​the iron-carbon micro-electrolysis plate can treat pollutants in the water, and the secondary debris of iron-carbon micro-electrolysis plays the role of fixing the floating plants. The floating plants can absorb heavy metal ions in the water through their roots, thereby reducing the heavy metal content in the water.

[0034] (2) The artificial floating island of iron-carbon micro-electrolysis coupled with floating plants of the present invention is equipped with a special crushing component, which can crush the used iron-carbon micro-electrolysis plate and aquatic plants and reuse them as secondary debris of iron-carbon micro-electrolysis for wastewater remediation. It is convenient to use and can promptly process the used iron-carbon micro-electrolysis plate and aquatic plants, thus improving work efficiency.

[0035] (3) The method of using an artificial floating island with iron-carbon micro-electrolysis coupled floating plants in this invention specifies the cycle and specific parameters of the artificial floating island, thereby achieving efficient sewage treatment and stable operation. Compared with the simple iron-carbon micro-electrolysis floating island, it has higher treatment efficiency, uses less raw materials, and can achieve certain economic benefits, especially in tailings ponds and industrial circulating water pools. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of an artificial floating island for iron-carbon micro-electrolytic coupling of floating plants according to the present invention.

[0037] Figure 2 This is a schematic diagram of the crushing component structure of an artificial floating island for iron-carbon micro-electrolysis coupled floating plants according to the present invention.

[0038] Figure 3 This is a front view of an artificial floating island of iron-carbon micro-electrolytic coupling floating plants according to the present invention;

[0039] Figure 4 This is a top view of an artificial floating island of iron-carbon micro-electrolytic coupling floating plants according to the present invention;

[0040] Figure 5 This is a side view of an artificial floating island of iron-carbon microelectrolytic coupling floating plants according to the present invention.

[0041] Among them, 1-floating plate, 11-plant growth hole, 12-groove, 13-through hole, 14-slide groove, 15-extension plate, 2-iron-carbon micro-electrolysis cavity, 3-iron-carbon micro-electrolysis plate, 31-placement rack, 32-opening, 33-stop bar, 4-crushing component, 41-slider, 42-crushing cylinder, 43-fixed frame, 44-stirring motor, 45-crushing roller, 46-feeding port, 47-pulverizer, 48-blade, 49-screen, 5-push rod motor, 51-telescopic rod, 52-clamping block. Detailed Implementation

[0042] Example 1

[0043] like Figure 1 and 5 As shown, an artificial floating island for iron-carbon micro-electrolysis coupled with floating plants includes a float plate 1, eight equally spaced iron-carbon micro-electrolysis cavities 2 located below the float plate 1, and several equally spaced iron-carbon micro-electrolysis plates 3 located below the float plate 1. The iron-carbon micro-electrolysis cavities 2 and iron-carbon micro-electrolysis plates 3 are arranged alternately. The float plate 1 and the placement frame 31 are made of polypropylene foam material. The surface of the iron-carbon micro-electrolysis plates 3 is provided with several openings 32. The thickness of the iron-carbon micro-electrolysis plates 3 is 5mm.

[0044] like Figure 1 and 4 As shown, the permeable net outside the iron-carbon micro-electrolysis cavity 2 is detachably connected to the bottom of the float plate 1. The permeable net is made of PE material. There are 48 plant growth holes 11 on both sides of the surface of the float plate 1 corresponding to the iron-carbon micro-electrolysis cavity 2. Each side of the float plate 1 has 3 plant growth holes 11 corresponding to each iron-carbon micro-electrolysis cavity 2.

[0045] like Figure 1 and 3 As shown, the surface of the float 1 corresponding to the iron-carbon micro-electrolysis plate 3 is provided with a groove 12, and a placement rack 31 for placing the iron-carbon micro-electrolysis plate 3 is provided below the groove 12. The placement rack 31 is detachably connected to the bottom of the float 1. There are 7 placement racks 31, and 8 iron-carbon micro-electrolysis plates 3 are placed in one placement rack 31. The placement rack 31 is a frame structure, and 7 baffles 33 are provided at equal intervals on both sides of the placement rack 31.

[0046] like Figure 1 and 2As shown, a crushing assembly 4 for crushing iron-carbon micro-electrolysis plates 3 is provided in the middle of the upper part of the float plate 1. The crushing assembly 4 includes a slider 41 that slides along the middle of the float plate 1. A crushing cylinder 42 is provided on the upper surface of the slider 41. A fixed frame 43 is provided on each side of the slider 41. A stirring motor 44 is fixedly connected to the ends of the two fixed frames 43 at the position directly above the slider 41. A crushing roller 45 is provided at the output end below the stirring motor 44. The crushing roller 45 extends into the crushing cylinder 42. A through hole 13 is provided in the middle of the surface of the float plate 1 corresponding to each iron-carbon micro-electrolysis cavity 2. A feed port 46 is provided at the bottom of the crushing cylinder 42 that penetrates the slider 41 and extends to the bottom of the slider 41. The crushing roller 45 is provided with 5 sets of blades 48 with gradually decreasing length from top to bottom. The length of the lower set of blades is 80% of the length of the upper set of blades. A 60-mesh screen 49 is provided at the feed port 46. Two pulleys 47 are provided on each side of the bottom of the slider 41. The pulleys 47 slide in the corresponding grooves 14 provided on the upper surface of the float plate 1. The grooves 14 are broken at the slots 12. The diameter of the pulleys 47 is greater than the width of the slots 12. The diameter of the pulleys 47 is 1.5 times that of the slots 12. An extension plate 15 is provided on one side of the float plate 1. A push rod motor 5 is provided at the end of the extension plate 15. A telescopic rod 51 is provided at the output end of the push rod motor 5. A clamping block 52 is provided at the end of the telescopic rod 51. The clamping block 52 is clamped and fixedly connected to the bottom of one of the fixed frames 43. The telescopic rod 51 is arranged parallel to the two grooves 14. A waterproof cover is provided on the outside of the push rod motor 5.

[0047] Both the stirring motor 44 and the push rod motor 5 are commercially available products.

[0048] Example 2

[0049] The difference between this embodiment and Embodiment 1 is that:

[0050] The thickness of the iron-carbon micro-electrolysis plate 3 is 4mm.

[0051] Example 3

[0052] The difference between this embodiment and Embodiment 1 is that:

[0053] The thickness of the iron-carbon micro-electrolysis plate 3 is 6mm.

[0054] Example 4

[0055] The difference between this embodiment and Embodiment 1 is that:

[0056] There are 6 iron-carbon micro-electrolysis cavities 2, and 4 plant growth holes 11 are provided on each side of the floating plate 1 corresponding to each iron-carbon micro-electrolysis cavity 2. There are 6 placement racks 31.

[0057] Example 5

[0058] The difference between this embodiment and Embodiment 1 is that:

[0059] There are 10 iron-carbon micro-electrolysis cavities 2, and each iron-carbon micro-electrolysis cavity 2 has 6 plant growth holes 11 on both sides of the floating plate 1. There are 10 placement racks 31.

[0060] Example 6

[0061] This embodiment describes a method for using an artificial floating island with iron-carbon micro-electrolysis coupled floating plants, as described in Embodiment 1, including the following steps:

[0062] S1. Preparation of iron-carbon micro-electrolysis plate 3: Sponge iron is crushed to 4 mm to obtain sponge iron powder, activated carbon is crushed to 2.5 mm to obtain activated carbon powder, sponge iron powder, activated carbon powder and environmentally friendly adhesive are mixed in a mass ratio of 1.5:2.6:0.8, the environmentally friendly adhesive is isocyanate adhesive, and mixed powder is obtained. The mixed powder is placed in a mold, and then heated and kept at 130℃ for 2.5 h. After taking it out, iron-carbon micro-electrolysis plate 3 is obtained.

[0063] S2. Construction of artificial floating islands: Place the floating plate 1 in the wastewater body to be treated, and place the iron-carbon micro-electrolysis plate 3 evenly in each placement rack 31. The sponge iron and activated carbon inside the iron-carbon micro-electrolysis plate 3 form a galvanic cell to oxidize, flocculate and adsorb the heavy metals in the wastewater body.

[0064] S3, Cyclic Repair:

[0065] S3-1: After the iron-carbon micro-electrolysis plate 3 is placed in the sewage for 2.5 months, the iron-carbon micro-electrolysis plate 3 is taken out and crushed by the crushing component 4 to obtain iron-carbon micro-electrolysis secondary debris. The crushed iron-carbon micro-electrolysis secondary debris in each placement rack 31 is added into the corresponding through hole 13 through the feeding port 46 and falls into the corresponding iron-carbon micro-electrolysis cavity 2. Aquatic plants are planted at each plant growth hole 11 and fixed with iron-carbon micro-electrolysis secondary debris. The new iron-carbon micro-electrolysis plate 3 is placed in the placement rack 31 for the next cycle of sewage water body repair.

[0066] The aquatic plant is Siberian iris;

[0067] S3-2: 2.5 months after the next cycle of wastewater body remediation, the secondary fragments of iron-carbon micro-electrolysis in the iron-carbon micro-electrolysis cavity 2 are removed. At the same time, the iron-carbon micro-electrolysis plate 3 is removed, crushed, and placed in the iron-carbon micro-electrolysis cavity 2. Aquatic plants are harvested, and aquatic plants are planted again at each plant growth hole 11 and fixed with secondary fragments of iron-carbon micro-electrolysis. The new iron-carbon micro-electrolysis plate 3 is placed in the placement rack 31 to realize the wastewater body circulation remediation.

[0068] Example 7

[0069] The difference between this embodiment and embodiment 6 is that the specific parameters for preparing the iron-carbon microelectrolysis plate 3 in S1 are different.

[0070] S1. Preparation of iron-carbon micro-electrolysis plate 3: Sponge iron is crushed to 3mm to obtain sponge iron powder, activated carbon is crushed to 2mm to obtain activated carbon powder, sponge iron powder, activated carbon powder and environmentally friendly adhesive are mixed in a mass ratio of 1:2:0.5, the environmentally friendly adhesive is isocyanate adhesive, and mixed powder is obtained. The mixed powder is placed in a mold, and then heated and kept at 120℃ for 2h. After taking it out, iron-carbon micro-electrolysis plate 3 is obtained.

[0071] Example 8

[0072] The difference between this embodiment and embodiment 6 is that the specific parameters for preparing the iron-carbon microelectrolysis plate 3 in S1 are different.

[0073] S1. Preparation of iron-carbon micro-electrolysis plate 3: Sponge iron is crushed to 5mm to obtain sponge iron powder, and activated carbon is crushed to 3mm to obtain activated carbon powder. The sponge iron powder, activated carbon powder and environmentally friendly adhesive are mixed in a mass ratio of 2:3:1. The environmentally friendly adhesive is an isocyanate adhesive. The mixed powder is placed in a mold and then heated and kept at 140℃ for 2 hours. After taking it out, iron-carbon micro-electrolysis plate 3 is obtained.

[0074] Note: In Examples 6-8, the mass ratios of sponge iron powder, activated carbon powder, and environmentally friendly adhesive are different. They can be adjusted proportionally within the range given in this invention.

[0075] Example 9

[0076] The difference between this embodiment and embodiment 6 is that: S3, the duration of each repair cycle is different during cyclic repair.

[0077] The wastewater remediation period is 2 months.

[0078] Example 10

[0079] The difference between this embodiment and embodiment 6 is that: S3, the duration of each repair cycle is different during cyclic repair.

[0080] The wastewater remediation cycle is 3 months.

[0081] Example 11

[0082] The difference between this embodiment and embodiment 6 is that:

[0083] The aquatic plant is water peanut.

[0084] Example 12

[0085] The difference between this embodiment and embodiment 6 is that:

[0086] The aquatic plant is Sedum sarmentosum.

[0087] Example 13

[0088] The difference between this embodiment and embodiment 6 is that:

[0089] The aquatic plant is pennywort.

[0090] Example 14

[0091] The difference between this embodiment and embodiment 6 is that:

[0092] The aquatic plants are yellow iris and water iris.

[0093] Working principle: The working principle of the crushing component 4 will be further explained below with reference to the method in Example 6.

[0094] During the S3 cycle repair, the push rod motor 5 is first turned on to control the extension and retraction of the telescopic rod 51, thereby driving the crushing component 4 to slide. The pulley 47 slides in the groove 14, so that the crushing component 4 is located above the first through hole 13 and aligned with the feed port 46. Then, the stirring motor 44 is turned on to drive the crushing roller 45 to rotate. The blades 48 on it cut and crush the iron-carbon micro-electrolysis plate 3 until the particle size is less than 60 mesh. Then, it falls through the screen 49 into the through hole 13 and enters the iron-carbon micro-electrolysis cavity 2 as secondary crushed iron-carbon micro-electrolysis material, which also serves to fix aquatic plants.

[0095] After processing one set of iron-carbon micro-electrolysis plates 3 and aquatic plants, the push rod motor 5 is turned on again to control the extension and retraction of the telescopic rod 51, thereby driving the crushing component 4 to slide, so that the crushing component 4 is positioned above the second through hole 13 and aligned with the feeding port 46. The set of iron-carbon micro-electrolysis plates 3 is crushed in the same way, and so on to complete the crushing process of 7 sets of iron-carbon micro-electrolysis plates 3. Since there are 7 sets of iron-carbon micro-electrolysis plates 3 and 8 sets of aquatic plants, a portion of the iron-carbon micro-electrolysis plates 3 in the first 7 sets is reserved as secondary iron-carbon micro-electrolysis debris for the last set. The harvested aquatic plants and the used secondary iron-carbon micro-electrolysis debris are transported together to the hazardous waste landfill for safe landfilling to avoid secondary pollution.

[0096] Experimental Example

[0097] Next, we conducted a simulation experiment according to the methods in Examples 6 and 11-13. The water body used in the experiment was tailings pond wastewater. The selected floating plate 1 was 4m long and 3m wide. After three S3 cycle remediations, the heavy metal content in the water and plants was measured, and the results are as follows:

[0098] In Example 6, Siberian iris showed resistance to copper ions (Cu) in water. 2+The removal rate of nickel ions (Ni) can reach up to 91.44%. 2+ The removal rate of lead ions (Pb) can reach up to 90.44%, and the removal rate of lead ions (Pb) can also reach up to 90.44%. 2+ The removal rate of zinc ions (Zn) can reach up to 94.65%. 2 + The removal rate can reach up to 92.36%;

[0099] In Example 11, water hyacinth reacts with copper ions (Cu) in water. 2+ The removal rate of nickel ions (Ni) can reach up to 96.22%. 2+ The removal rate can reach up to 90.77%, and the removal rate of lead ions (Pb) can reach 90.77%. 2+ The removal rate of zinc ions (Zn) can reach up to 92.33%. 2+ The removal rate can reach up to 95.90%;

[0100] In Example 12, Sedum aizoon showed its effect on copper ions (Cu) in water. 2+ The removal rate of nickel ions (Ni) can reach up to 90.10%. 2+ The removal rate of lead ions (Pb) can reach up to 92.73%, and the removal rate of lead ions (Pb) can reach up to 92.73%. 2+ The removal rate of zinc ions (Zn) can reach up to 98.84%. 2+ The removal rate can reach up to 97.78%;

[0101] In Example 13, the copper coin grass showed good resistance to copper ions (Cu) in water. 2+ The removal rate of nickel ions (Ni) can reach up to 93.59%. 2+ The removal rate can reach up to 90.86%, and the removal rate of lead ions (Pb) can reach up to 90.86%. 2+ The removal rate of zinc ions (Zn) can reach up to 87.43%. 2+ The removal rate can reach up to 98.25%;

[0102] The results above show that, although there are multiple heavy metal ions interfering with each other in the tailings pond wastewater, the method of the present invention can still effectively reduce the heavy metal content in the water.

[0103] Experimental Example 2

[0104] In addition, we conducted comparative experiments. Taking Example 6 as an example, we used the same amount of raw materials (sponge iron powder + activated carbon powder) to make three sets of iron-carbon micro-electrolysis plates 3 for single-method repair. After each repair cycle, the plates were completely replaced. The total repair time was the same. The results are as follows:

[0105] In the comparative example, Siberian iris showed a higher concentration of copper ions (Cu) in water. 2+ The removal rate of nickel ions (Ni) can reach up to 85.62%.2+ The removal rate of lead ions (Pb) can reach up to 83.37%, and the removal rate of lead ions (Pb) can reach up to 83.37%. 2+ The removal rate of zinc ions (Zn) can reach up to 88.95%. 2 + The removal rate can reach up to 90.49%;

[0106] It can be seen that the removal rate of heavy metal ions is improved by adopting the cyclic remediation method of the present invention. This is because the comparative example lacked the step of crushing the iron-carbon micro-electrolysis plate 3 and placing it in the iron-carbon micro-electrolysis cavity 2. When using the iron-carbon micro-electrolysis plate 3 alone for water remediation, the effect is generally poor, the electrolysis reaction is incomplete, and the contact area between the wastewater and the iron-carbon micro-electrolysis plate 3 is insufficient, which makes it easy for some materials to fail to play the role of oxidation, flocculation and adsorption. Therefore, the present invention is more economically advantageous than the single method of remediation.

Claims

1. A method for using an artificial floating island composed of iron-carbon micro-electrolysis coupled with floating aquatic plants, characterized in that, The artificial floating island includes a floating plate (1), a plurality of iron-carbon micro-electrolysis cavities (2) arranged at equal intervals below the floating plate (1), and a plurality of iron-carbon micro-electrolysis plates (3) arranged at equal intervals below the floating plate (1). The iron-carbon micro-electrolysis cavities (2) and the iron-carbon micro-electrolysis plates (3) are arranged alternately. The permeable mesh provided outside the iron-carbon micro-electrolysis cavity (2) is detachably connected to the bottom of the float plate (1), and several plant growth holes (11) are provided on both sides of the surface of the float plate (1) corresponding to the iron-carbon micro-electrolysis cavity (2). The surface of the floating plate (1) corresponding to the iron-carbon micro-electrolysis plate (3) is provided with a groove (12), and a placement rack (31) for placing the iron-carbon micro-electrolysis plate (3) is provided below the groove (12). The placement rack (31) is detachably connected to the bottom of the floating plate (1). The floating plate (1) is provided with a crushing assembly (4) for crushing the iron-carbon micro-electrolysis plate (3) at the middle of the upper part. The crushing assembly (4) includes a slider (41) that slides along the middle of the floating plate (1). The upper surface of the slider (41) is provided with a crushing cylinder (42). Each side of the slider (41) is provided with a fixed frame (43). The ends of the two fixed frames (43) are fixedly connected to a stirring motor (44) at the position directly above the slider (41). The output end of the stirring motor (44) is provided with a crushing roller (45). The crushing roller (45) extends into the crushing cylinder (42). The middle of the surface of the floating plate (1) is provided with a through hole (13) corresponding to each iron-carbon micro-electrolysis cavity (2). The bottom of the crushing cylinder (42) is provided with a feed port (46) that penetrates the slider (41) and extends to the bottom of the slider (41). The method of using artificial floating islands includes the following steps: S1. Preparation of iron-carbon micro-electrolysis plate (3): Take sponge iron and crush it to 3~5mm to obtain sponge iron powder, take activated carbon and crush it to 2~3mm to obtain activated carbon powder, mix the sponge iron powder, the activated carbon powder and environmentally friendly adhesive in a mass ratio of 1~2:2~3:0.5~1 to obtain mixed powder, place the mixed powder in a mold, and then heat and keep warm at 120~140℃ for 2~3h, and take it out to obtain iron-carbon micro-electrolysis plate (3). S2, Artificial floating island construction: Place the floating plate (1) in the sewage body to be treated, and place the iron-carbon micro-electrolysis plate (3) evenly in each of the placement racks (31). Use the sponge iron and activated carbon inside the iron-carbon micro-electrolysis plate (3) to form a galvanic cell to oxidize, flocculate and adsorb the heavy metals in the sewage body. S3, Cyclic Repair: S3-1: After the iron-carbon micro-electrolysis plate (3) is placed in the sewage for 2-3 months, the iron-carbon micro-electrolysis plate (3) is taken out and crushed by the crushing component (4) to obtain iron-carbon micro-electrolysis secondary debris. The crushed iron-carbon micro-electrolysis secondary debris in each of the placement racks (31) is added into the corresponding through hole (13) through the feeding port (46) and falls into the corresponding iron-carbon micro-electrolysis cavity (2). Aquatic plants are planted at each of the plant growth holes (11) and fixed with iron-carbon micro-electrolysis secondary debris. The new iron-carbon micro-electrolysis plate (3) is placed in the placement rack (31) for the next cycle of sewage water body repair. S3-2: Two to three months after the next cycle of wastewater body remediation, the secondary fragments of iron-carbon micro-electrolysis in the iron-carbon micro-electrolysis cavity (2) are removed. At the same time, the iron-carbon micro-electrolysis plate (3) is removed, crushed, and placed in the iron-carbon micro-electrolysis cavity (2). Aquatic plants are harvested and planted again at each of the plant growth holes (11) and fixed with secondary fragments of iron-carbon micro-electrolysis. The new iron-carbon micro-electrolysis plate (3) is placed in the placement rack (31) to realize wastewater body circulation remediation.

2. The method of using an artificial floating island of iron-carbon micro-electrolysis coupled floating plants according to claim 1, characterized in that, The floating plate (1) and the placement rack (31) are made of polypropylene foam material, the permeable net is made of PE material, the iron-carbon micro-electrolysis plate (3) has several openings (32) on its surface, and the thickness of the iron-carbon micro-electrolysis plate (3) is 4~6mm.

3. The method of using an artificial floating island of iron-carbon micro-electrolysis coupled floating plants according to claim 1, characterized in that, There are 6 to 10 placement racks (31). The placement rack (31) is a frame structure and has several baffles (33) at equal intervals on both sides.

4. The method of using an artificial floating island of iron-carbon micro-electrolysis coupled floating plants according to claim 1, characterized in that, There are 6 to 10 iron-carbon micro-electrolysis cavities (2), and each side of the float plate (1) is provided with 3 to 6 plant growth holes (11) corresponding to each iron-carbon micro-electrolysis cavity (2).

5. The method of using an artificial floating island of iron-carbon micro-electrolysis coupled floating plants according to claim 1, characterized in that, The slider (41) has two pulleys (47) on each side of its bottom. The pulleys (47) slide in the groove (14) on the upper surface of the float (1). The groove (14) is broken at the slot (12), and the diameter of the pulleys (47) is greater than the width of the slot (12).

6. The method of using an artificial floating island of iron-carbon micro-electrolysis coupled floating plants according to claim 5, characterized in that, The float (1) has an extension plate (15) on one side, and a push rod motor (5) is provided at the end of the extension plate (15). The output end of the push rod motor (5) is provided with a telescopic rod (51), and the end of the telescopic rod (51) is provided with a clamping block (52). The clamping block (52) is clamped and fixedly connected to the bottom of one of the fixed frames (43). The telescopic rod (51) is arranged parallel to the two slides (14). The push rod motor (5) is provided with a waterproof cover.

7. The method of using an artificial floating island of iron-carbon micro-electrolysis coupled floating plants according to claim 1, characterized in that, The crushing roller (45) is provided with several sets of blades (48) with gradually decreasing length from top to bottom, and a 60-mesh screen (49) is provided at the feed inlet (46).

8. The method of using an artificial floating island of iron-carbon micro-electrolysis coupled floating plants according to claim 1, characterized in that, The environmentally friendly adhesive is an isocyanate adhesive, and the aquatic plant is one or more of the following: Siberian iris, water hyacinth, sedum, pennywort, yellow iris, and water calamus.

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