End ecological enhancement treatment system suitable for combined system discharge port

Abstract

The invention discloses a tail end ecological enhancement treatment system suitable for a combined system discharge port, the outer side of the combined system discharge port is enclosed into a treatment area through an impermeable enclosure, a set distance is reserved between the bottom edge of the impermeable enclosure and the lake bottom, a gabion retaining wall is arranged on the outer side of the impermeable enclosure, the treatment area is divided into a strong aeration area and a weak aeration area, and the weak aeration area is divided into a strong aeration area and a weak aeration area. A first ecological floating island is arranged in the strong aeration area, a filler is hung at the bottom of the first ecological floating island, a microbial culture solution perforated output pipe of the first microbial adding system extends into the strong aeration area, a second ecological floating island is arranged in the weak aeration area, and a filler is hung at the bottom of the second ecological floating island; and a microorganism culture solution opening output pipe of the second microorganism feeding system extends into the strong aeration area. The combined system discharge port overflow pollution is pretreated, main pollutants in the combined system discharge port overflow pollution are reduced, polluted water at the tail end of the discharge port is purified, and the follow-up water purification pressure is relieved.

Description

Technical Field

[0001] The present invention belongs to the field of river and lake water environment restoration, and provides a terminal ecological enhancement treatment system suitable for combined sewer outlets. The present invention is suitable for purification pretreatment of overflow pollution at the terminal of a combined sewer outlet with a small interception multiple, reducing the pressure of subsequent water environment ecological purification and improving the quality of river and lake water environment. Background Art

[0002] The drainage systems of residential areas around the inner lakes of the city are mostly combined sewer systems, and most of the outlets along the river are combined sewer outlets. On rainy days, rainwater mixed with domestic sewage overflows from the combined sewer outlets into the inner lake water body, which is an important factor causing the water quality to fail to meet the standards, or even become black and smelly. However, due to historical reasons and the rapid development of the city, the pipeline network in some old urban areas is complicated, and the diversion system transformation is very difficult, so the interception type combined sewer outlet will still exist for a long time. At present, the treatment method for the combined sewer outlet is to increase the interception multiple, so that the combined sewage with a higher initial pollutant concentration enters the sewage treatment plant first, and the mixed sewage that exceeds the interception multiple is subsequently discharged into the lake. Another way is to build a regulating reservoir, collect the overflow sewage into the regulating reservoir, discharge the sewage beyond the regulating range into the lake, and stagger the sewage in the regulating reservoir to the sewage pipe network and enter the sewage treatment plant for treatment. However, both methods require that the sewage treatment plant has sufficient capacity to cooperate, or the built storage tank is too large, and the operation and maintenance costs are high. It is difficult to achieve it immediately in economically underdeveloped cities. Therefore, setting up a certain range of ecological enhancement treatment systems at the end of the interception combined sewer outlet to reduce the pressure of subsequent water self-purification still has a relatively broad application prospect in the current environment. Summary of the invention

[0003] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to provide a terminal ecological enhancement treatment system suitable for combined sewer outlets, which can pre-treat the overflow pollution of the combined sewer outlets, reduce the main pollutants (SS, COD, NH4-N, etc.), purify the polluted water at the end of the outlet and reduce the subsequent water purification pressure.

[0004] The above-mentioned purpose of the present invention can be achieved by the following technical means:

[0005] A terminal ecological enhancement treatment system suitable for a combined sewer outlet comprises a garbage interception device arranged at the combined sewer outlet, the outer side of the combined sewer outlet is enclosed as a treatment area by an impermeable enclosure, the bottom edge of the impermeable enclosure is at a set distance from the lake bottom, a gabion stone cage retaining wall is arranged outside the impermeable enclosure, and the treatment area is divided into a strong aeration area and a weak aeration area along the water flow direction from the combined sewer outlet to the gabion stone cage retaining wall, a first ecological floating island is arranged in the strong aeration area, a filler is suspended at the bottom of the first ecological floating island, a microorganism culture solution perforated output pipe of a first microorganism dosing system extends into the strong aeration area, a dense perforated aeration pipe is arranged below the first ecological floating island, a second ecological floating island is arranged in the weak aeration area, a filler is suspended at the bottom of the second ecological floating island, a microorganism culture solution perforated output pipe of a second microorganism dosing system extends into the strong aeration area, and a sparse perforated aeration pipe is arranged below the second ecological floating island.

[0006] As mentioned above, the upper part of the watertight enclosure is movably arranged on the enclosure fixing piles through a connecting ring, a floating ball is arranged on the top of the watertight enclosure, and the bottom of the watertight enclosure is 0.5-1m away from the lake bottom.

[0007] As described above, the gabion retaining wall includes a vertical wall and a transverse extension wall. The bottom of the vertical wall is connected to the transverse extension wall buried in the lake bottom. The vertical wall and the transverse extension wall are L-shaped as a whole. The transverse extension wall extends to the treatment area near the inner side of the impermeable enclosure and the top surface of the transverse extension wall extending to the treatment area near the inner side of the impermeable enclosure is flush with the lake bottom.

[0008] As mentioned above, the vertical wall of the gabion cage retaining wall entering the lake is wrapped with a HDPE anti-seepage membrane.

[0009] As mentioned above, emergent plants are planted on the first ecological floating island, and the emergent plants planted on the first ecological floating island are one or more of canna and windmill grass. The filler suspended at the bottom of the first ecological floating island is carbon fiber aquatic plants or biological ropes. Emergent plants are planted on the second ecological floating island, and the emergent plants planted on the second ecological floating island are one or more of lily of the valley, iris, etc., and the filler suspended at the bottom of the second ecological floating island is carbon fiber aquatic plants or biological ropes.

[0010] As mentioned above, the garbage interception device includes a dense mesh interception net and a coarse interception net sequentially arranged along the water flow direction, the aperture of the dense mesh interception net is 2-10mm, and the aperture of the coarse interception net is 16-20mm.

[0011] As mentioned above, the dissolved oxygen concentration in the strong aeration zone is controlled at 1.5-2 mg / L, and the dissolved oxygen concentration in the weak aeration zone is controlled at 0.2-0.5 mg / L.

[0012] As described above, the microbial culture liquid perforated output pipe corresponding to the first microbial dosing system and the microbial culture liquid perforated output pipe corresponding to the second microbial dosing system are both hoses, and the liquid outlet end of the microbial culture liquid perforated output pipe corresponding to the first microbial dosing system is fixed to the filler suspended below the first ecological floating island and close to the bottom of the first ecological floating island through a pipe fixing device; the liquid outlet end of the microbial culture liquid perforated output pipe corresponding to the second microbial dosing system is fixed to the filler suspended below the second ecological floating island and close to the bottom of the second ecological floating island through a pipe fixing device.

[0013] As described above, the first ecological floating island is connected to the counterweight system at the bottom of the lake via a connecting rope, and the second ecological floating island is connected to the counterweight system at the bottom of the lake via a connecting rope.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] After the overflow sewage leaves the combined sewer outlet, it is preferentially retained in the closed treatment area for treatment before entering the lake. The treatment area is divided into a strong aeration area and a weak aeration area in turn, which can respond quickly to the sewage discharged into the treatment area. This avoids the long-term absence of overflow sewage, which greatly reduces the amount of microorganisms on the ecological floating island, and the untimely response to the large-scale sewage that suddenly enters the lake, which reduces the overall treatment efficiency. At the same time, the addition of the aeration system divides the reaction area into a strong aeration area and a weak aeration area, forming an aerobic and anaerobic environment, which is conducive to improving the removal effect of pollutants, especially the removal of total nitrogen. The outlet uses a lower gabion retaining wall to discharge water, which can more effectively organize the water flow, allow the sewage to stay in the treatment area longer, and optimize the hydraulic path, which indirectly improves the overall treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 The schematic diagram of the opening of the dense opening aeration pipe;

[0018] Figure 3 The diagram of the opening of the aeration pipe with open holes is shown;

[0019] Figure 4 Schematic diagram of the opening of the output tube for microbial culture fluid.

[0020] In the figure:

[0021] 1-garbage interception device; 11-dense interception net; 12-coarse interception net; 2A-first ecological floating island; 2B second ecological floating island; 21-emergent plants; 22-filler; 23-weight system; 3-aeration system; 31-floating plate; 32-emergent plants; 33-aerator fixing pile; 34-dense hole aeration pipe; 35-sparse hole aeration pipe; 4A-first microbial dosing system; 4B-second microbial dosing system; 41-doser fixing pile; 42-microbial culture solution opening output pipe; 43-pipe fixing device; 5-watertight enclosure; 51-enclosure fixing pile; 6-gabion stone cage retaining wall; 61-gabion filler; 62-HDPE anti-seepage membrane. DETAILED DESCRIPTION

[0022] In order to facilitate those skilled in the art to understand and use the present invention, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the implementation examples described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0023] Embodiment 1:

[0024] A terminal ecological enhancement treatment system suitable for a combined sewer outlet comprises a garbage interception device 1 arranged at the combined sewer outlet, the outer side of the combined sewer outlet is enclosed by an impermeable enclosure 5 as a treatment area, a set distance is left between the bottom edge of the impermeable enclosure 5 and the lake bottom, a water outlet gap is formed between the bottom edge of the impermeable enclosure 5 and the lake bottom, a gabion stone cage retaining wall 6 is arranged outside the impermeable enclosure 5, the bottom of the gabion stone cage retaining wall 6 is arranged at the lake bottom, the treatment area inside the impermeable enclosure 5 is drained through the water outlet gap, the drainage through the water outlet gap enters the water area outside the impermeable enclosure 5 after passing through the gabion stone cage retaining wall 6, and the treatment area is divided into a strong aeration area and a weak aeration area along the water flow direction from the combined sewer outlet to the gabion stone cage retaining wall 6 A first ecological floating island 2A is arranged in the strong aeration zone, a filler 22 is suspended at the bottom of the first ecological floating island 2A, a microbial culture solution perforated output pipe 42 of the first microbial dosing system 4A extends to the strong aeration zone, a densely-opened aeration pipe 34 is arranged below the first ecological floating island 2A, and the densely-opened aeration pipe 34 is connected to a corresponding blower, a second ecological floating island 2B is arranged in the weak aeration zone, a filler 22 is suspended at the bottom of the second ecological floating island 2B, a microbial culture solution perforated output pipe 42 of the second microbial dosing system 4B extends to the strong aeration zone, a sparsely-opened aeration pipe 35 is arranged below the second ecological floating island 2B, and the sparsely-opened aeration pipe 35 is connected to a corresponding blower.

[0025] A closed treatment area is set up by an impermeable enclosure 5. After the overflow sewage is discharged from the combined sewer outlet, it first passes through the garbage interception device 1 to intercept most of the garbage in the pipeline, and then enters the treatment area. It is mainly treated by the first ecological floating island 2A and the second ecological floating island 2B in the treatment area, and the removal principle is the biofilm method. The first ecological floating island 2A and the second ecological floating island 2B both include a composite fiber layer and a foam block arranged on the composite fiber layer. The composite fiber layer includes an upper polyester fiber layer, a middle coconut shell fiber, and a lower polyester fiber layer. The total thickness of the composite fiber layer is 16-20cm, and a hole for planting water plants is opened on the composite fiber layer. The emergent plants 21 planted in the planting hole for the emergent plants can absorb nutrients in the water body, and the filler 22 suspended below is used as a microbial bed for microorganisms to attach and grow. The dominant populations of microorganisms in the strong aeration zone and the weak aeration zone are controlled by the first microbial addition system 4A, the second microbial addition system 4B, the dense hole aeration pipe 34, and the sparse hole aeration pipe 35 to improve the pollutant removal effect. Finally, the water flows through the gabion stone cage retaining wall 6 and enters the lake area. After the gabion stone cage retaining wall 6 is filled with stone cage fillers, it can also play a certain pollutant removal effect. At the same time, the gabion stone cage retaining wall 6 can also make the water flow spread more evenly, making the subsequent pollution load more balanced.

[0026] In some embodiments, the upper part of the impermeable enclosure 5 is movably arranged on the enclosure fixing pile 51 through a connecting ring, a floating ball is arranged on the top of the impermeable enclosure 5, the bottom of the impermeable enclosure 5 is 0.5-1m away from the lake bottom, the gabion stone cage retaining wall 6 includes a vertical wall and a transverse extension wall, the bottom of the vertical wall is connected to the transverse extension wall buried in the lake bottom, the vertical wall and the transverse extension wall are L-shaped as a whole, the transverse extension wall extends to the treatment area near the inner side of the impermeable enclosure 5 (close to the combined sewer outlet side) and extends to the treatment area near the inner side of the impermeable enclosure 5. The top surface of the transverse extension wall is flush with the lake bottom. The impermeable enclosure 5 can adjust its height with the water level under the action of the floating ball, the enclosure fixing pile 51 can be a galvanized steel pipe pile, and the impermeable enclosure is made of PVC.

[0027] The gabion retaining wall 6 is woven with galvanized low-carbon steel wire, and the gabion filler 61 in the gabion retaining wall 6 can be ordinary stone or functional filler. The side of the vertical wall of the gabion retaining wall 6 that enters the lake (the side away from the shore) is wrapped with a HDPE anti-seepage membrane to ensure that the purified water penetrates from bottom to top through the gabion retaining wall 6.

[0028] In some embodiments, the garbage interception device 1 includes a dense mesh interception net 11 and a coarse interception net 12 arranged in sequence along the water flow direction, the aperture of the dense mesh interception net 11 is 2-10 mm, and the aperture of the coarse interception net 12 is 16-20 mm. Prevent garbage from entering the subsequent treatment area. The garbage interception device 1 is arranged in two layers, the dense mesh interception net 11 close to the combined sewer outlet adopts a floating ball interception net, and the coarse interception net 12 far away from the combined sewer outlet adopts a fixed height interception net.

[0029] In some embodiments, the first ecological floating island 2A is planted with emergent plants 21, and the emergent plants 21 planted on the first ecological floating island 2A are one or more of canna and windmill grass, and the filler hung at the bottom of the first ecological floating island 2A is carbon fiber aquatic plants or biological ropes. The second ecological floating island 2B is planted with emergent plants 21, and the emergent plants 21 planted on the second ecological floating island 2B are one or more of lily of the valley, iris, etc., and the filler hung at the bottom of the second ecological floating island 2B is carbon fiber aquatic plants or biological ropes.

[0030] In some embodiments, the wall of the dense-opening aeration tube 34 is provided with multiple rows of aeration holes, the extension direction of each row of aeration holes is parallel to the tube axis direction of the dense-opening aeration tube 34, adjacent rows of aeration holes are staggered, the hole spacing between adjacent aeration holes in each row is 5 cm, and the aeration hole diameter is 1 cm; the wall of the sparse-opening aeration tube 35 is symmetrically provided with two rows of aeration holes, the extension direction of each row of aeration holes is parallel to the tube axis direction of the dense-opening aeration tube 34, the hole spacing between adjacent aeration holes in each row is 10 cm, and the aeration hole diameter is 1 cm. The delivery volume of the dense-opening aeration tube 34 below the dense-strong aeration zone and the sparse-opening aeration tube 35 below the weak aeration zone is controlled by valves, and the dissolved oxygen concentration in the strong aeration zone is controlled to be about 1.5-2 mg / L. The dissolved oxygen concentration in the weak aeration zone is controlled to be 0.2-0.5 mg / L.

[0031] The first microbial dosing system 4A and the second microbial dosing system 4B respectively add different types of microorganisms to the strong aeration zone and the weak aeration zone to enhance the pollutant removal efficiency of the treatment unit. The strong aeration zone mainly solves suspended pollutants, COD, ammonia nitrogen and total phosphorus in the water body. The microorganism Bacillus cereus WF01 with flocculation effect was deposited in the China Center for Type Culture Collection (No. 299, Bayi Road, Wuchang District, Wuhan City, Hubei Province, China Center for Type Culture Collection, Postal Code: 430072) on March 4, 2021, and the deposit number is CCTCC NO: M2021207. The strong aeration zone can be fully mixed with water, and the environment can be aerobic, which is conducive to the reproduction of aerobic bacteria and Bacillus cereus, and meets the requirements for the removal of pollutants such as COD and ammonia nitrogen; sufficient mixing and flocculation can meet the removal requirements of suspended matter and total phosphorus. The weak aeration zone is mainly used to remove total nitrogen. The denitrifying microorganism Pseudomonas stutzeri K13 was added and deposited in the China Center for Type Culture Collection (No. 299, Bayi Road, Wuchang District, Wuhan City, Hubei Province, China Center for Type Culture Collection, Postal Code: 430072) on April 6, 2023, with the deposit number: CCTCC NO: M2023487. The weak aeration zone creates an anaerobic environment based on the characteristics of denitrifying bacteria, strengthens the denitrification effect, and removes total nitrogen from the water body.

[0032] The microbial culture liquid perforated output pipe 42 corresponding to the first microbial dosing system 4A and the microbial culture liquid perforated output pipe 42 corresponding to the second microbial dosing system 4B are both hoses. The liquid outlet end of the microbial culture liquid perforated output pipe 42 corresponding to the first microbial dosing system 4A is fixed to the filler suspended below the first ecological floating island 2A and close to the bottom of the first ecological floating island 2A through a pipe fixing device 43; the liquid outlet end of the microbial culture liquid perforated output pipe 42 corresponding to the second microbial dosing system 4B is fixed to the filler suspended below the second ecological floating island 2B and close to the bottom of the second ecological floating island 2B through a pipe fixing device 43. The microbial culture liquid perforated output pipe 42 corresponding to the first microbial addition system 4A is provided with a plurality of rows of bacteria liquid holes at the part located below the first ecological floating island 2A, the aperture of the bacteria liquid holes is 0.5 cm, and the spacing between the bacteria liquid holes is 10 cm; the microbial culture liquid perforated output pipe 42 corresponding to the second microbial addition system 4B is provided with a plurality of rows of bacteria liquid holes at the part located below the second ecological floating island 2B, the aperture of the bacteria liquid holes is 0.5 cm, and the spacing between the bacteria liquid holes is 10 cm, so as to facilitate the dissolution, smooth diffusion and attachment of the cultured microorganisms to the filler.

[0033] In some embodiments, the first ecological floating island 2A is connected to the counterweight system at the bottom of the lake by a connecting rope, and the second ecological floating island 2B is connected to the counterweight system at the bottom of the lake by a connecting rope. The counterweight system can increase the wind and wave resistance of the first ecological floating island 2A and the second ecological floating island 2B.

[0034] Embodiment 2:

[0035] There are combined sewer outlets distributed along the inner lake road in a certain city. In order to solve the problem of excessive overflow of sewage into the lake, the present invention is installed at the combined sewer outlet. The combined sewer outlet is a d1000 concrete pipe, and the purification area is set to 4300m 2 , including 2300m of strong aeration area 2 , dissolved oxygen concentration 1.5~2.0mg / L, weak aeration zone 2000m 2 , dissolved oxygen concentration 0.2~0.5mg / L, the total area of ​​the first ecological floating island 2A and the second ecological floating island 2B is 2050m 2 . The three first microbial dosing systems 4A are responsible for dosing microorganisms in the strong aeration zone, and the other three second microbial dosing systems 4B are responsible for dosing microorganisms in the weak aeration zone. The three blowers are connected to the dense hole aeration pipe 34, and the other three blowers are connected to the sparse hole aeration pipe 35. The gabion filler is crushed stone. After overflow pollution occurs during rainfall, it can be clearly seen that the water quality at the combined sewer outlet is poor, and the farther away from the combined sewer outlet, the better the water quality. Within 3 days after the rainfall ended, the water quality at the combined sewer outlet also returned to normal levels.

[0036] Table 1 Water quality changes before and after treatment

[0037]

[0038]

[0039] It should be noted that the embodiments described in the present invention are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the described embodiments or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A terminal ecological enhancement treatment system adapted to a combined sewer outlet, comprising a garbage interception device (1) arranged at the combined sewer outlet, characterized in that: The outer side of the combined sewer outlet is enclosed by an impermeable enclosure (5) to form a treatment area. The bottom edge of the impermeable enclosure (5) is at a set distance from the lake bottom. A gabion stone cage retaining wall (6) is arranged outside the impermeable enclosure (5). Along the water flow direction from the combined sewer outlet to the gabion stone cage retaining wall (6), the treatment area is divided into a strong aeration area and a weak aeration area. A first ecological floating island (2A) is arranged in the strong aeration area. A filler (22) is suspended at the bottom of the first ecological floating island (2A). A first microbial dosing system ( The microbial culture liquid perforated output pipe (42) of the first microbial dosing system (4A) extends into the strong aeration zone, a dense perforated aeration pipe (34) is arranged below the first ecological floating island (2A), a second ecological floating island (2B) is arranged in the weak aeration zone, a filler (22) is suspended at the bottom of the second ecological floating island (2B), the microbial culture liquid perforated output pipe (42) of the second microbial dosing system (4B) extends into the strong aeration zone, and a sparse perforated aeration pipe (35) is arranged below the second ecological floating island (2B).

2. According to claim 1, a terminal ecological enhancement treatment system suitable for combined sewer outlets is characterized in that: The upper part of the watertight enclosure (5) is movably arranged on the enclosure fixing pile (51) through a connecting ring, a floating ball is arranged on the top of the watertight enclosure (5), and the bottom of the watertight enclosure 5 is 0.5-1m away from the lake bottom.

3. According to claim 1, a terminal ecological enhancement treatment system suitable for combined sewer outlets is characterized in that: The gabion retaining wall (6) comprises a vertical wall and a transverse extension wall. The bottom of the vertical wall is connected to the transverse extension wall buried in the lake bottom. The vertical wall and the transverse extension wall are L-shaped as a whole. The transverse extension wall extends to the treatment area close to the inner side of the impermeable enclosure (5) and the top surface of the transverse extension wall extending to the treatment area close to the inner side of the impermeable enclosure (5) is flush with the lake bottom.

4. According to claim 3, a terminal ecological enhancement treatment system suitable for combined sewer outlets is characterized in that: The lake-entering side of the vertical wall of the gabion stone cage retaining wall (6) is wrapped with a HDPE anti-seepage membrane.

5. According to claim 1, a terminal ecological enhancement treatment system suitable for combined sewer outlets is characterized in that: The first ecological floating island (2A) is planted with emergent plants (21), the emergent plants (21) planted on the first ecological floating island (2A) are one or more of canna and windmill grass, the filler suspended at the bottom of the first ecological floating island (2A) is carbon fiber water grass or biological rope, the second ecological floating island (2B) is planted with emergent plants (21), the emergent plants (21) planted on the second ecological floating island (2B) are one or more of lily of the valley, iris, etc., and the filler suspended at the bottom of the second ecological floating island (2B) is carbon fiber water grass or biological rope.

6. According to claim 1, a terminal ecological enhancement treatment system suitable for combined sewer outlets is characterized in that: The garbage interception device (1) comprises a dense mesh interception net (11) and a coarse interception net (12) which are arranged in sequence along the water flow direction, the aperture of the dense mesh interception net (11) is 2-10 mm, and the aperture of the coarse interception net (12) is 16-20 mm.

7. According to claim 1, a terminal ecological enhancement treatment system suitable for combined sewer outlets is characterized in that: The dissolved oxygen concentration in the strong aeration zone is controlled at 1.5-2 mg / L, and the dissolved oxygen concentration in the weak aeration zone is controlled at 0.2-0.5 mg / L.

8. According to claim 1, a terminal ecological enhancement treatment system suitable for combined sewer outlets is characterized in that: The microbial culture liquid perforated output pipe (42) corresponding to the first microbial dosing system (4A) and the microbial culture liquid perforated output pipe (42) corresponding to the second microbial dosing system (4B) are both hoses. The liquid outlet end of the microbial culture liquid perforated output pipe (42) corresponding to the first microbial dosing system (4A) is fixed to the filler suspended below the first ecological floating island (2A) and close to the bottom of the first ecological floating island (2A) through a pipe fixing device (43); the liquid outlet end of the microbial culture liquid perforated output pipe (42) corresponding to the second microbial dosing system (4B) is fixed to the filler suspended below the second ecological floating island (2B) and close to the bottom of the second ecological floating island (2B) through a pipe fixing device (43).

9. The terminal ecological enhancement treatment system adapted to the combined sewer outlet according to claim 1, characterized in that: The first ecological floating island (2A) is connected to the counterweight system at the bottom of the lake via a connecting rope, and the second ecological floating island (2B) is connected to the counterweight system at the bottom of the lake via a connecting rope.

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