A system for treating polluted water in underflowing rural rivers

Abstract

The utility model discloses a polluted water treatment system for an underflowing rural river, the two sides of the river are river banks, and the river banks are provided with ecological grass-planted ditch units, revetment subsurface wetland units, and drawdown zone surface flow wetland units for purifying land sewage in order from far to near in the depth direction; an ecological floating island unit is provided in the river, and the ecological floating island unit and the drawdown zone surface flow wetland unit jointly purify the water in the water area; and also includes a forced drainage unit, which lifts and transfers the water in the downstream of the river and discharges it to the upstream of the river after crossing the ecological floating island unit and the drawdown zone surface flow wetland unit. The utility model can purify sewage from the shore, the waterside, and the water at multiple levels, and strengthen the local fluidity of the water body through lifting and transferring the water body, so as to promote the continuous purification and treatment capacity of the water body, and achieve the purpose of long-term purification of the water body.

Description

Technical Field

[0001] The utility model relates to a system, in particular to a polluted water treatment system for an underflowing rural river. Background Art

[0002] In rural production and daily life, a large amount of wastewater and garbage are generated. The discharge of these polluted water bodies will cause great damage to people’s living environment.

[0003] Especially for the underflowing rivers in rural areas, due to the poor water flow conditions, it is impossible to directly adopt the treatment solutions for urban polluted rivers such as sewage interception and pipelining, artificial wetlands, dredging, ecological restoration, and water aeration. Therefore, it is urgently needed to develop and research effective sewage treatment solutions for underflowing rural rivers. Utility Model Content

[0004] The utility model aims at the drawbacks of the prior art and provides a polluted water treatment system for an underflowing rural river.

[0005] The polluted water treatment system for the underflowing rural river of the utility model comprises river banks on both sides of the river, and an ecological grass-planting ditch unit, a revetment subsurface wetland unit, and a drawdown zone surface wetland unit for purifying land sewage are arranged on the river banks in order from far to near in the depth direction;

[0006] An ecological floating island unit is arranged in the river channel, and the ecological floating island unit and the surface flow wetland unit of the drawdown zone jointly purify the sewage in the water area;

[0007] It also includes a forced drainage unit, which lifts and transfers the water in the downstream of the river channel and discharges it to the upstream of the river channel after crossing the ecological floating island unit and the surface flow wetland unit of the drawdown zone.

[0008] In the polluted water body treatment system for underflowing rural rivers described in the utility model, the ecological grass-planting ditch unit includes a ditch body, and a water distribution outlet is arranged on one side of the ditch body close to the revetment submerged flow wetland unit, and the water distribution outlet is connected to the revetment submerged flow wetland unit.

[0009] In the polluted water treatment system for the underflowing rural river described in the utility model, an overflow weir is arranged at the end or the middle section of the ditch body.

[0010] In the polluted water treatment system for the underflowing rural river of the utility model, the revetment subsurface wetland unit includes ecological vegetation covering the surface;

[0011] A fine-diameter filler layer, a medium-diameter filler layer, and a large-diameter filler layer are sequentially arranged from top to bottom under the ecological vegetation;

[0012] The water distribution port is connected to the large-diameter filler layer.

[0013] In the polluted water treatment system for the underflowing rural river described in the utility model, the ecological floating island unit floats on the water surface of the river and is connected to the river bank by a pulling rope.

[0014] In the polluted water treatment system for the underflowing rural river of the utility model, the forced drainage unit comprises a water lifting and transfer pump arranged at the downstream of the river and a water lifting and transfer outlet arranged at the upstream of the river, and the water lifting and transfer pump is connected with the water lifting and transfer outlet through a water lifting and transfer pipeline;

[0015] It also includes an electrically connected photovoltaic power generation module, an energy storage module, and an electrical control module, wherein the energy storage module stores the electric energy generated by the photovoltaic power generation module and provides electric energy for the water body lifting transfer pump;

[0016] The electrical control module controls the water lifting and transfer pump to pump water from the downstream of the river channel according to external control instructions, and lifts and transfers the water to the upstream of the river channel through the water lifting and transfer pipeline, and then discharges it from the water lifting and transfer outlet.

[0017] The polluted water treatment system for the sluggish rural river described in the utility model can simply, conveniently, economically and effectively treat rainwater channels, irrigation channels, rivers and other rural water bodies with limited land use and sluggish flow without dredging, and can purify sewage from the shore, the waterside and the water at multiple levels, and enhance the local fluidity of the water body through water lifting and transfer, so as to promote the continuous purification treatment capacity of the water body while improving the ecological environment of the water body, thereby achieving the purpose of long-term purification of the water body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a distribution diagram of the polluted water treatment system for the underflowing rural river of the utility model;

[0019] Figure 2 It is a cross-sectional schematic diagram of the polluted water treatment system for the underflowing rural river of the utility model;

[0020] Figure 3 It is a cross-sectional schematic diagram of an ecological grass-planting ditch unit in the polluted water treatment system for an underflowing rural river according to the utility model. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0022] like Figure 1 , Figure 2 , Figure 3 As shown, in the polluted water body treatment system for the underflowing rural river described in the utility model, the two sides of the river 2 are river banks. In practice, land areas such as river banks are usually close to the rural living area 12 and the agricultural production area 11, and the terrestrial sewage generated by the agricultural production area 11 and the rural living area 12 will flow into the river 2 through the ditch 13.

[0023] In the polluted water treatment system for the rural river with less flow described in the utility model, in view of the shortcoming that the sewage in the rural river with less flow has weak self-purification ability, the river bank is provided with an ecological grass-planted ditch unit 3, a revetment subsurface wetland unit 4, and a drawdown zone surface flow wetland unit 5 for collecting and purifying land sewage in the order from far to near in the depth direction. At the same time, an ecological floating island unit 6 is provided in the river channel 2, and the ecological floating island unit 6 and the drawdown zone surface flow wetland unit 5 are used to purify the water sewage (after the land sewage flows into the river channel, it forms water sewage together with the original polluted water in the river channel). In addition, in order to solve the problem of poor water flow in the underflowing river channel, a forced drainage unit 7 is also provided in the utility model. The forced drainage unit 7 lifts and transfers the water in the downstream of the river channel 2 and discharges it to the upstream of the river channel 2 after passing through the ecological floating island unit 6 and the drawdown zone surface flow wetland unit 5, thereby changing the flow condition of the underflowing polluted water in the river channel 2, so that the polluted water in the river channel can circulate through the ecological floating island unit 6 and the drawdown zone surface flow wetland unit 5 for purification treatment to achieve the purification effect.

[0024] In the polluted water treatment system for underflowing rural rivers described in the utility model, the ecological grass-planted ditch unit 3 collects terrestrial sewage (i.e., terrestrial sewage generated by agricultural production and rural life is first collected into the ecological grass-planted ditch unit 3 through the ditch 13), and solids such as garbage are filtered at the same time. After the sewage is preliminarily treated, the effluent is distributed. Specifically, the ecological grass-planted ditch unit 3 includes a ditch body 31, and emergent plants such as reeds are planted along the extension direction of the ditch body 31. In order to filter solid garbage, a grille (not shown in the figure) can also be set on the side of the ditch body 31 that receives terrestrial sewage. In addition, in order to cope with the damage to the ditch body 31 caused by excessive water volume during the rainfall period, an overflow weir 32 is also provided in the utility model. The overflow weir 32 can usually intercept terrestrial sewage, and discharge excess water when the water volume in the ditch body 31 is too large, so as to ensure the safety of the ditch body 31. The overflow weir 32 is usually arranged at the end of the ditch body 31. If the length of the ditch body 31 is long, an overflow weir 32 may be added in the middle of the ditch body 31. In the present invention, a water distribution port 33 is also arranged at the lower part of the ditch body 31 near the side of the revetment submerged flow wetland unit 4, and the water distribution port 33 is connected to the revetment submerged flow wetland unit 4.

[0025] In the polluted water treatment system for the underflowing rural river described in the utility model, the revetment submerged wetland unit 4 is located at the rear end of the ecological grass-planted ditch unit 3, and is used to reprocess the effluent of the ecological grass-planted ditch unit 3, that is, the SS, COD, ammonia nitrogen, total nitrogen, TP and other pollutants in the sewage are intercepted, adsorbed, and anaerobic / anoxic. At the same time, the wetland plants ecologically absorb and degrade the pollutants in the sewage. In the rainy season, the revetment submerged wetland unit 4 also has the function of water conservation, which can absorb and conserve water, and release water in the dry rainy season to supplement the water volume in the river. The revetment submerged wetland unit 4 specifically includes reeds covering the ground surface or ecological vegetation suitable for the local area. The coverage range of the ecological vegetation is above the multi-year average water level of the river channel during the flat water period to the bottom of the ditch body 31 of the ecological grass-planted ditch 3; under the ecological vegetation, a fine-diameter filler layer 41 (such as fine sand, plain soil, etc., to provide an attachment basis for the ecological vegetation), a medium-diameter filler layer 42 (such as expanded clay, waste bricks, etc.) and a large-diameter filler layer 43 (such as gravel, zeolite, expanded clay, volcanic rock, etc.) are arranged in sequence from top to bottom. Among them, the functions of the medium-diameter filler layer 42 and the large-diameter filler layer 43 are, on the one hand, to filter impurities in the incoming water and serve as a carrier for microbial adsorption to purify the water quality, and on the other hand, to serve as a support carrier for the fine-diameter filler layer 41. The water distribution port 33 of the ditch body 31 is connected to the large-diameter filler layer 43. Furthermore, the revetment submerged wetland unit 4 is also provided with a water-blocking curtain 40, which further divides the revetment submerged wetland 4 into a plurality of cells perpendicular to the river channel. The water-blocking curtain 40 can also be provided at the junction of the revetment submerged wetland unit 4 and the water level line of the river channel during the multi-year normal water period.

[0026] In the polluted water treatment system for the underflowing rural river described in the utility model, the surface flow wetland unit 5 in the drawdown zone can perform deep ecological purification treatment on land sewage, and also continuously purify the polluted water in the water area, and has the functions of water conservation, biological habitat provision, and landscaping. The surface flow wetland unit 5 in the drawdown zone can be planted with reeds or other emergent plants suitable for the local area, and its layout range can be specifically constructed on the river bank above the multi-year average dry season water level line and below the multi-year average flood season water level line according to the requirements of the river bank ecological protection blue line and the layout of the aforementioned revetment submerged wetland unit 4, so as to re-process and purify the effluent of the revetment submerged wetland unit 4.

[0027] In the polluted water treatment system for underflowing rural rivers described in the utility model, the ecological floating island unit 6 floats on the water surface of the river 2. The ecological floating island unit 6 is composed of a buoyancy support frame, and landscape aquatic plants such as calamus, sedge grass, loosestrife, pink-green foxtail algae, and Li's grass are planted within the buoyancy support frame. The ecological floating island unit 6 can continuously purify the water in the river, and at the same time has the functions of providing biological habitats, beautifying the landscape, and maintaining the dynamic balance of the water ecosystem. In the specific layout, according to the flood control requirements of the river and the construction requirements of the ecological floating island, the ecological floating island unit 6 can be connected to the river bank through fixed components such as a pull rope 61.

[0028] In the polluted water treatment system for the underflowing rural river of the utility model, the forced drainage unit 7 provided to improve the fluidity of the river water specifically comprises a water lifting and transfer pump 73 provided at the downstream of the river and a water lifting and transfer outlet 72 provided at the upstream of the river, and the water lifting and transfer pump 73 is connected with the water lifting and transfer outlet 72 through a water lifting and transfer pipeline 71. The forced drainage unit 7 can promote the improvement of the fluidity of the river water, increase the dissolved oxygen content of the river water, improve the river landscape, and increase the frequency of purification treatment of the river water. The forced drainage unit 7 also includes a matching photovoltaic power generation module, an energy storage module, and an electrical control module (not shown in the figure) connected by cables. The energy storage module stores the electric energy generated by the photovoltaic power generation module and provides electric energy for the water lifting and transfer pump 73; the electrical control module controls the water lifting and transfer pump 73 according to external control instructions to pump the water in the downstream of the river channel, and lifts and transfers it to the upstream of the river channel through the water lifting and transfer pipeline 71, and then discharges it from the water lifting and transfer outlet 72.

[0029] The polluted water treatment system for the sluggish rural river described in the utility model can simply, conveniently, economically and effectively treat rainwater channels, irrigation channels, rivers and other rural water bodies with limited land use and sluggish flow without dredging, and can purify sewage from the shore, the waterside and the water at multiple levels, and enhance the local fluidity of the water body through water lifting and transfer, so as to promote the continuous purification treatment capacity of the water body while improving the ecological environment of the water body, thereby achieving the purpose of long-term purification of the water body.

[0030] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A system for treating polluted water in a rural river with insufficient flow, the two sides of which are river banks, characterized in that: On the river bank, there are arranged in order from far to near in the depth direction an ecological grass-planted ditch unit for purifying land sewage, a revetment subsurface wetland unit, and a drawdown zone surface wetland unit; An ecological floating island unit is arranged in the river channel, and the ecological floating island unit and the surface flow wetland unit of the drawdown zone jointly purify the sewage in the water area; It also includes a forced drainage unit, which lifts and transfers the water in the downstream of the river channel and discharges it to the upstream of the river channel after crossing the ecological floating island unit and the surface flow wetland unit of the drawdown zone.

2. The polluted water treatment system for underflowing rural rivers as claimed in claim 1 is characterized in that: The ecological grass-planting ditch unit comprises a ditch body, and a water distribution outlet is arranged on one side of the ditch body close to the revetment submerged flow wetland unit, and the water distribution outlet is connected to the revetment submerged flow wetland unit.

3. The polluted water treatment system for underflowing rural rivers as claimed in claim 2 is characterized in that: An overflow weir is arranged at the end or the middle section of the ditch body.

4. The polluted water treatment system for underflowing rural rivers as claimed in claim 2 is characterized in that: The revetment subsurface wetland unit includes ecological vegetation covering the surface; A fine-diameter filler layer, a medium-diameter filler layer, and a large-diameter filler layer are sequentially arranged from top to bottom under the ecological vegetation; The water distribution port is connected to the large-diameter filler layer.

5. The polluted water treatment system for underflowing rural rivers as claimed in claim 1 is characterized in that: The ecological floating island unit floats on the water surface of the river channel and is connected to the river bank by a tow rope.

6. The polluted water treatment system for underflowing rural rivers as claimed in claim 1, characterized in that: The forced drainage unit comprises a water lifting and transfer pump arranged at the downstream of the river channel and a water lifting and transfer outlet arranged at the upstream of the river channel, and the water lifting and transfer pump is connected to the water lifting and transfer outlet through a water lifting and transfer pipeline; It also includes an electrically connected photovoltaic power generation module, an energy storage module, and an electrical control module, wherein the energy storage module stores the electric energy generated by the photovoltaic power generation module and provides electric energy for the water body lifting transfer pump; The electrical control module controls the water lifting and transfer pump to pump water from the downstream of the river channel according to external control instructions, and lifts and transfers the water to the upstream of the river channel through the water lifting and transfer pipeline, and then discharges it from the water lifting and transfer outlet.

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