A wetland system for purifying water at the estuary of a lake

Abstract

A wetland system for purifying water quality at an estuary entering a lake, comprising: a water control mechanism, a flood diversion embankment, a multi-level pond wetland purification system, a river channel in-situ purification system and an estuary water conservancy sluice station hub, wherein the downstream end of the water control mechanism is connected to the flood diversion embankment, the multi-level pond wetland purification system is connected to one side of the flood diversion embankment, the river channel in-situ purification system is connected to the other side of the flood diversion embankment, and the estuary water conservancy sluice station hub is connected to the multi-level pond wetland purification system and the downstream end of the river channel in-situ purification system. Among them, the multi-level pond wetland purification system comprises: a pretreatment pond, a facultative biological pond, an aerated aerobic pond, an ecological pond, an aquatic plant pond, a dike, a first bionic water grass, a first submersible centrifugal aerator, benthic organisms and submerged plants. Compared with the traditional technology, the present invention enhances the flood discharge and storage and water quality purification capabilities of the river channel estuary area, and realizes the three functions of flood discharge and storage, water quality purification and environmental beautification in the river channel estuary area.

Description

Technical Field

[0001] The invention relates to the field of water treatment, and in particular to a wetland system for purifying water quality at an estuary entering a lake. Background Art

[0002] The pollution load of rivers entering the lake is one of the main sources of lake pollution load. Improving the water quality of rivers entering the lake and reducing the pollution load are crucial to preventing and controlling lake eutrophication. The main ways to improve the water quality of rivers entering the lake include in-situ purification of the river and ex-situ purification of the river. Leading river water into artificial wetlands for river water improvement and purification is a commonly used ex-situ purification method for river water quality in engineering. Traditional surface flow artificial wetlands have a small hydraulic load and occupy a large area. Subsurface flow wetlands are prone to blockage during long-term operation and are not suitable for large-scale layout. In addition, under the condition of limited wetland area beside the river entering the lake, the wetland purification time is short, the natural purification effect is limited, and the purification effect needs to be strengthened in space and time. Therefore, it is urgent to develop a wetland system that can effectively remove nitrogen and phosphorus pollutants in water and achieve enhanced water purification effects under the condition of limited available land area.

[0003] To solve the above problems, we made a series of improvements. Summary of the invention

[0004] The object of the present invention is to provide a wetland system for purifying water quality at the estuary of a lake, so as to overcome the above-mentioned shortcomings and deficiencies of the prior art.

[0005] A wetland system for purifying water quality at an estuary entering a lake, comprising: a water conservancy regulation mechanism, a flood diversion embankment, a multi-level pond wetland purification system, a river channel in-situ purification system and an estuary water conservancy sluice station hub, wherein the downstream end of the water conservancy regulation mechanism is connected to the flood diversion embankment, the multi-level pond wetland purification system is connected to one side of the flood diversion embankment, the river channel in-situ purification system is connected to the other side of the flood diversion embankment, and the estuary water conservancy sluice station hub is connected to the downstream ends of the multi-level pond wetland purification system and the river channel in-situ purification system;

[0006] Among them, the multi-stage pond wetland purification system includes: a pretreatment pond, a facultative biological pond, an aerated aerobic pond, an ecological pond, an aquatic plant pond, a dike, a first bionic aquatic plant, a first submersible centrifugal aerator, benthic organisms and submerged plants. The pretreatment pond, facultative biological pond, aerated aerobic pond, ecological pond and aquatic plant pond are connected in series in sequence through the dike. The first bionic aquatic plant is connected to the inside of the pretreatment pond, facultative biological pond and aerated aerobic pond. The first submersible centrifugal aerator is connected to the bottom of the pretreatment pond, facultative biological pond and aerated aerobic pond. The benthic organisms are arranged in the ecological pond, the submerged plants are arranged in the aquatic plant pond, and the first bionic aquatic plant is a buoy-type structure.

[0007] Furthermore, the water control mechanism includes: a diversion fish mouth, a water-blocking rubber dam and a wetland water inlet control valve, the diversion fish mouth is connected to the flood diversion dike, the water-blocking rubber dam is connected to one side of the diversion fish mouth, the wetland water inlet control valve is connected to the other side of the diversion fish mouth, the water-blocking rubber dam is arranged on the river in-situ purification system, and the wetland water inlet control valve is arranged on the multi-stage pond wetland purification system.

[0008] Furthermore, the flood diversion embankment includes: a backfill clay area, a gabion, riprap and a Reno pad, wherein the gabion is connected to the top of the backfill clay area, the riprap is connected to the bottom of the right side of the backfill clay area, and the Reno pad is connected to the slope surface of the backfill clay area and the upper surface of the gabion.

[0009] Furthermore, the river in-situ purification system includes: a main river channel, second bionic water plants and a second submersible centrifugal aerator, and the second bionic water plants and the second submersible centrifugal aerator are arranged inside the main river channel.

[0010] Furthermore, the estuary water conservancy sluice station hub includes: a flood control sluice and a drainage pump station, and the flood control sluice is connected to both sides of the drainage pump station.

[0011] Beneficial effects of the present invention:

[0012] Compared with traditional technologies, the present invention enhances the flood discharge and storage and water purification capabilities of river estuary areas by adding a multi-level pond wetland purification system and flood diversion dikes, while achieving the three major functions of flood discharge and storage, water purification and environmental beautification in the river estuary areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the general engineering plan of the present invention.

[0014] Figure 2 This is a schematic diagram of the structure of the flood diversion dike.

[0015] Figure 3 This is a schematic diagram of the structure of a multi-stage pond wetland purification system.

[0016] Figure 4 This is a schematic diagram of the structure of the river in-situ purification system.

[0017] Reference numerals:

[0018] A water control mechanism 100 , a diversion fish mouth 110 , a water retaining rubber dam 120 and a wetland water inlet regulating valve 130 .

[0019] Flood diversion embankment 200, backfill clay area 210, gabions 220, riprap 230 and Reno pad 240.

[0020] A multi-stage pond wetland purification system 300, a pretreatment pond 310, a facultative biological pond 320, an aerated aerobic pond 330, an ecological pond 340, an aquatic plant pond 350, a barrier dam 360, a first bionic water grass 370, a first submersible centrifugal aerator 380, benthic organisms 390 and submerged plants 3100.

[0021] A river in-situ purification system 400 , a main river channel 410 , a second bionic water plant 420 and a second submersible centrifugal aerator 430 .

[0022] The estuary water conservancy sluice station hub 500, the flood control sluice 510 and the drainage pump station 520. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0024] Example 1

[0025] Figure 1 It is a schematic diagram of the structure of the present invention. Figure 2 This is a schematic diagram of the structure of the flood diversion dike. Figure 3 This is a schematic diagram of the structure of a multi-stage pond wetland purification system. Figure 4 This is a schematic diagram of the structure of the river in-situ purification system.

[0026] like Figure 1 to Figure 4 As shown, a wetland system for purifying water quality at an estuary entering a lake comprises: a water control mechanism 100, a flood diversion dike 200, a multi-level pond wetland purification system 300, a river channel in-situ purification system 400 and an estuary water conservancy sluice station hub 500, wherein the downstream end of the water control mechanism 100 is connected to the flood diversion dike 200, the multi-level pond wetland purification system 300 is connected to one side of the flood diversion dike 200, the river channel in-situ purification system 400 is connected to the other side of the flood diversion dike 200, and the estuary water conservancy sluice station hub 500 is connected to the downstream ends of the multi-level pond wetland purification system 300 and the river channel in-situ purification system 400;

[0027] The multi-stage pond wetland purification system 300 includes: a pretreatment pond 310, a facultative biological pond 320, an aerated aerobic pond 330, an ecological pond 340, an aquatic plant pond 350, a dike 360, a first bionic waterweed 370, a first submersible centrifugal aerator 380, benthic organisms 390 and submerged plants 3100. The pretreatment pond 310, the facultative biological pond 320, the aerated aerobic pond 330, the ecological pond 340 and the aquatic plant pond 350 are connected by a plurality of channels. The partitions 360 are connected in series in sequence, the first bionic water grass 370 is connected to the inside of the pretreatment pond 310, the facultative biological pond 320 and the aerated aerobic pond 330, the first submersible centrifugal aerator 380 is connected to the bottom of the pretreatment pond 310, the facultative biological pond 320 and the aerated aerobic pond 330, the benthic organisms 390 are arranged in the ecological pond 340, the submerged plants 3100 are arranged in the aquatic plant pond 350, and the first bionic water grass 370 is a buoy structure.

[0028] The water control mechanism 100 includes: a diversion fish mouth 110, a water retaining rubber dam 120 and a wetland water inlet control valve 130. The diversion fish mouth 110 is connected to the flood diversion dike 200, the water retaining rubber dam 120 is connected to one side of the diversion fish mouth 110, and the wetland water inlet control valve 130 is connected to the other side of the diversion fish mouth 110. The water retaining rubber dam 120 is arranged on the river in-situ purification system 400, and the wetland water inlet control valve 130 is arranged on the multi-stage pond wetland purification system 300.

[0029] The flood diversion embankment 200 includes: a backfill clay area 210, a gabion 220, riprap 230 and a Reynolds pad 240. The gabion 220 is connected to the top of the backfill clay area 210, the riprap 230 is connected to the right bottom of the backfill clay area 210, and the Reynolds pad 240 is connected to the slope surface of the backfill clay area 210 and the upper surface of the gabion 220.

[0030] The river in-situ purification system 400 includes: a main river channel 410 , second bionic water plants 420 and a second submersible centrifugal aerator 430 . The second bionic water plants 420 and the second submersible centrifugal aerator 430 are arranged inside the main river channel 410 .

[0031] The estuary water conservancy sluice station hub 500 includes: a flood control sluice 510 and a drainage pump station 520, and the flood control sluice 510 is connected to the drainage pump station 520 at both sides.

[0032] This embodiment is located at the downstream estuary of a certain urban river in Hefei City where it enters Chaohu Lake. The project scope includes a river estuary area of ​​about 1,000 mu, and the river length is about 2.73 km. An urban river in-situ estuary wetland water purification system is constructed in the above estuary area. The system construction of this embodiment mainly includes estuary sluice station, adjustable water retaining structure, water diversion fish mouth, wetland inlet control gate, flood diversion embankment, multi-level pond joint control wetland, and river in-situ purification unit.

[0033] The Hekou sluice station project is a single-hole sluice with hydraulic opening and closing and a herringbone gate. The drainage pumps are respectively set in the underground cavities on both sides of the sluice, with 4 pumps on each side, for a total of 8 pumps. The main operating conditions of the sluice station design are: ① During the flood season, when the water level of Chaohu Lake is lower than the water level of the Shiwuli River, the gate is opened to quickly discharge the upstream flood into Chaohu Lake through the flood discharge gate; ② During the flood season, when the water level of Chaohu Lake exceeds the water level in the Shiwuli River and is higher than 12.0m, the gate is closed for flood prevention, and the drainage pumps on both sides are used to force the water from the inland river to ensure that the area is not flooded by the 20-year flood; ③ During the non-flood season, the gate is closed, and the drainage flap gate set on the gate is used to control the river water level to 11.0m during the flood season and 11.50m during the non-flood season to meet the needs of river landscape and water quality treatment.

[0034] The adjustable water retaining structure adopts the rubber dam project. The main project consists of the rubber dam bottom plate and dam body, upstream blanket, downstream energy dissipation and left and right bank wing walls. The operation of the rubber dam is controlled by the pump room water pump, and the water retaining height is adjusted by filling and pumping water in the dam bag.

[0035] The mouth of the water-dividing fish is pointed and smooth at the head, and the end is streamlined and appropriately enlarged.

[0036] The wetland inlet control gate is designed as a single-hole sluice gate. A reinforced concrete blanket is arranged upstream of the gate chamber and a reinforced concrete blanket energy dissipation pool is arranged downstream of the gate chamber; a mortar-laid stone apron is arranged downstream of the energy dissipation pool; a dry-laid stone apron is arranged downstream of the energy dissipation pool, and a riprap anti-scouring groove is arranged downstream of the apron. The upstream and downstream wing walls of the sluice gate and the left and right banks are all reinforced concrete arm-type retaining wall structures.

[0037] The flood diversion embankment adopts earth-rock structure and trapezoidal cross-section structure. The top of the embankment, the main river channel side and the core wetland side all adopt trapezoidal cross-section riprap foot protection and Reno slope protection.

[0038] The multi-level pond joint control wetland adopts the sequential series process of pretreatment pond, facultative biological pond, first aerated aerobic pond, second aerated aerobic pond, ecological pond and aquatic plant pond. The pretreatment pond area is 11165m 2 , with an average water depth of 3.3m; the area of ​​facultative biological ponds is 41,100m 2 , average water depth 4m; the first aerated aerobic pond area 77893m 2 The average water depth is 4.5m; the second aerated aerobic pond area is 38664m 2 , with an average water depth of 3m; biological pond area of ​​59823m 2 , with an average water depth of 2.5m; the area of ​​aquatic plant ponds is 90227m 2, with an average water depth of 1.8m. Fixed bionic water plants were installed in the pretreatment pond, facultative biological pond, first aerated aerobic pond and second aerated aerobic pond, using vinylon elastic fillers; submersible centrifugal aerators were installed in the facultative biological pond, first aerated aerobic pond and second aerated aerobic pond; underwater flow propellers were installed in the facultative biological pond, first aerated aerobic pond, second aerated aerobic pond and ecological pond; aquatic and benthic animal populations were restored in the ecological pond; high-density submerged plants and emergent plant communities were restored in the plant pond.

[0039] The river in-situ purification system deploys buoy-type bionic aquatic plants in the river, uses vinylon elastic filler, and is equipped with a centrifugal submersible aerator.

[0040] The working principle of the present invention is to build an estuary water conservancy sluice station hub 500 downstream of the river estuary wetland, build a water conservancy regulation mechanism 100 composed of a diversion fish mouth 110, a water-blocking rubber dam 120 and a wetland water inlet control valve 130 at the entrance of the estuary wetland, build a river in-situ purification system 400 on the main flood channel 410 downstream of the water retaining structure, and build a multi-stage pond wetland purification system 300 downstream of the wetland water inlet control valve 130. The river in-situ purification system 400 and the multi-stage pond wetland purification system 300 are separated by a flood diversion dike 200, wherein submerged aeration and bionic aquatic plant measures are implemented in the river in-situ purification system 400, and the multi-stage pond wetland purification system 300 adopts multi-stage biological pond technology and is supplemented by submerged aeration, underwater flow, bionic aquatic plants, ecological food chain construction, and submerged plant planting measures. The present invention enhances the flood discharge and storage and water purification capabilities of the river estuary area by adding a multi-level pond wetland purification system and a flood diversion dike, while achieving the three functions of flood discharge and storage, water purification and environmental beautification in the river estuary area.

[0041] The specific implementation modes of the present invention are described above, but the present invention is not limited thereto. The present invention can also have various changes without departing from the purpose of the present invention.

Claims

1. A wetland system for purifying water quality at an estuary entering a lake, characterized in that: include: A water control mechanism (100), a flood diversion dam (200), a multi-level pond wetland purification system (300), a river channel in-situ purification system (400) and a river estuary water control station hub (500), wherein the downstream end of the water control mechanism (100) is connected to the flood diversion dam (200), the multi-level pond wetland purification system (300) is connected to one side of the flood diversion dam (200), the river channel in-situ purification system (400) is connected to the other side of the flood diversion dam (200), and the river estuary water control station hub (500) is connected to the downstream ends of the multi-level pond wetland purification system (300) and the river channel in-situ purification system (400); The multi-stage pond wetland purification system (300) comprises: a pretreatment pond (310), a facultative biological pond (320), an aerated aerobic pond (330), an ecological pond (340), an aquatic plant pond (350), a barrier dam (360), a first bionic aquatic plant (370), a first submersible centrifugal aerator (380), benthic organisms (390) and submerged plants (3100), wherein the pretreatment pond (310), the facultative biological pond (320), the aerated aerobic pond (330), the ecological pond (340) and the aquatic plant pond (350) are connected by barrier dams. The dikes (360) are connected in series in sequence, the first bionic waterweed (370) is connected to the inside of the pretreatment pond (310), the facultative biological pond (320) and the aerated aerobic pond (330), the first submersible centrifugal aerator (380) is connected to the bottom of the pretreatment pond (310), the facultative biological pond (320) and the aerated aerobic pond (330), the benthic organisms (390) are arranged in the ecological pond (340), the submerged plants (3100) are arranged in the aquatic plant pond (350), and the first bionic waterweed (370) is a buoy-type structure; The water conservancy regulation mechanism (100) comprises: a diversion fish mouth (110), a water retaining rubber dam (120) and a wetland water inlet control valve (130); the diversion fish mouth (110) is connected to a flood diversion dike (200); the water retaining rubber dam (120) is connected to one side of the diversion fish mouth (110); the wetland water inlet control valve (130) is connected to the other side of the diversion fish mouth (110); the water retaining rubber dam (120) is arranged on a river in-situ purification system (400); and the wetland water inlet control valve (130) is arranged on a multi-stage pond wetland purification system (300); The flood diversion embankment (200) comprises: a backfill clay area (210), a gabion (220), riprap (230) and a Reynolds pad (240), wherein the gabion (220) is connected to the top of the backfill clay area (210), the riprap (230) is connected to the right bottom of the backfill clay area (210), and the Reynolds pad (240) is connected to the slope surface of the backfill clay area (210) and the upper surface of the gabion (220).

2. The wetland system for purifying water quality at the estuary of a lake according to claim 1, characterized in that: The river channel in-situ purification system (400) comprises: a main river channel (410), second bionic water plants (420) and a second submersible centrifugal aerator (430), wherein the second bionic water plants (420) and the second submersible centrifugal aerator (430) are arranged inside the main river channel (410).

3. The wetland system for purifying water quality at the estuary of a lake according to claim 1, characterized in that: The estuary water conservancy sluice station hub (500) comprises: a flood control sluice (510) and a flood drainage pump station (520), and the flood control sluice (510) is connected to the flood drainage pump station (520) at both sides.

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