Construction method of plant rock composite type biological structure bank protection system

Abstract

The invention belongs to the technical field of ecological restoration, and particularly discloses a plant rock composite biological structure bank protection system construction method which comprises the steps that (1) rock cutting is conducted underwater, and a rock frame is obtained; (2) a groove is dug in the side, located on the shore, of the rock frame; (3) placing the rock roll on a rock rack; (4) driving the first timber pile into soil on one side, far away from the shore, of the rock roll through nylon meshes of the rock roll; (5) fixing the rock roll to the first timber pile by using a first twisted rope; (6) soil backfilling is carried out in the grooves; (7) a plant roll is placed on the side, located on the shore, of the rock roll; (8) gravel backfilling is conducted at the plant roll placement position; (9) driving a second timber pile into one side, far away from the shore, of the plant roll, and fixing the plant roll on the second timber pile by using a second twisted rope; and (10) sowing green plants on a slope on one side, far away from the shore, of the plant roll. The bank protection system is firm and friendly, and has double benefits of cost and environment sustainability.

Description

Technical Field

[0001] The invention belongs to the technical field of ecological restoration, and in particular relates to a method for constructing a plant-rock composite biological structure bank protection system. Background Art

[0002] The revetment system is an engineering measure used to protect the shore and surrounding environment of water bodies. It is mainly used to prevent soil erosion, flooding and bank slope stability. It is widely used around rivers, lakes, coasts and other water bodies. It can not only protect the natural environment, but also maintain the safety and sustainable development of human activities. Generally speaking, the core component of the revetment system is ecological revetment, which uses natural elements such as plants and geotechnical materials and adopts bioengineering methods to consolidate the shoreline, promote ecological restoration and improve biodiversity.

[0003] In the prior art, some ecological revetment technologies have been developed, and their structural forms are diverse. For example, patent document CN101487242A provides an ecological revetment system with replaceable plant carriers. Through the use of replaceable carriers, the revetment plants can be easily replaced, which solves the difficult problems of the decline of the interception of non-point source pollution and water purification during the decline of revetment plants in the bank slope system, and the impact on the ecological landscape of the river. It focuses on solving the problem of plant carrier replacement; for example, patent document CN107759021A provides an automatic ecological revetment system for river water purification, which uses a PLC control cabinet to control the water quality of each river, detects DO and water level in the water body, and takes corresponding response measures, effectively reducing labor costs and making river water quality management more intelligent. It focuses on the intelligent monitoring and regulation of water quality. How to achieve low-cost and efficient riverbank ecosystem construction from the innovative design of ecological revetment structure is a topic worthy of continuous exploration and research.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method for constructing a plant-rock composite biological structure revetment system. The constructed revetment system is strong and friendly, and has the dual benefits of cost-effectiveness and environmental sustainability.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A method for constructing a plant-rock composite biological structure revetment system comprises the following steps:

[0008] (1) After determining the location underwater, rock cutting is performed to obtain a rock shelf to provide support for the placement of the rock roll;

[0009] (2) digging a trench on the shore side of the rock shelf for placing a first twisted rope to secure the rock roll; the rock roll is made of crushed stone filled in a nylon net;

[0010] (3) Placing the rock roll on the rock shelf;

[0011] (4) driving the first wooden stake through the nylon mesh of the rock roll into the soil on the side of the rock roll away from the shore;

[0012] (5) securing the rock roll to the first stake using a first twist rope;

[0013] (6) backfilling the trench excavated in step (2);

[0014] (7) Placing a plant roll on the shore side of the rock roll;

[0015] (8) Gravel backfilling is performed where the plant rolls are placed;

[0016] (9) driving a second wooden stake into the side of the plant roll away from the shore, and securing the plant roll to the second wooden stake using a second twist rope;

[0017] (10) Seeding of green plants on the slope of the plant roll away from the shore.

[0018] As a preferred embodiment of the technical solution of the present invention, in step (4), the first wooden pile is driven into a position close to the river bank.

[0019] As a preferred embodiment of the technical solution of the present invention, in step (7), the preparation of the plant rolls comprises the following steps:

[0020] S1, preparing planting matrix;

[0021] S2. After wrapping the roots of the green plants with the planting matrix, place it on coconut mat or coconut shell fiber, and then tie up the coconut mat or coconut shell fiber with hemp rope to wrap the roots of the green plants wrapped with the planting matrix.

[0022] As a preferred embodiment of the technical solution of the present invention, in step S1, the preparation of the planting matrix includes the following steps:

[0023] S11, mixing the rice husks with the composite bacteria, and naturally stacking and fermenting them for 7 to 14 days to obtain the fermented rice husks for later use;

[0024] S12, grinding the vermiculite raw material to 150-250 mesh after cleaning, and then stirring in hydrochloric acid; after the treatment is completed, filtering, washing, drying, and finally grinding to 100-200 mesh to obtain modified vermiculite, which is reserved;

[0025] S13, mixing attapulgite with sodium hydroxide, treating at high temperature, and grinding to 80-150 mesh after the treatment to obtain modified attapulgite for later use;

[0026] S14, 15-25 parts by mass of peat soil, 25-40 parts by mass of fermented rice husks, 20-30 parts by mass of modified vermiculite, 15-25 parts by mass of modified attapulgite, and 1-1.5 parts by mass of water are mixed and stirred to obtain a planting medium.

[0027] As a preferred embodiment of the technical solution of the present invention, in step S11, the mass ratio of rice husk to composite bacteria is 1:0.06-0.1, and the composite bacteria is composed of Bacillus subtilis and yeast in equal masses.

[0028] As a preferred embodiment of the technical solution of the present invention, in step S12, the concentration of hydrochloric acid is 0.5-1 mol / L, the stirring treatment temperature is 90-95° C., and the treatment time is 2-6 h.

[0029] As a preferred embodiment of the technical solution of the present invention, in step S13, the mass ratio of attapulgite to sodium hydroxide is 1:0.4-0.6, the high temperature treatment temperature is 780-800°C, and the treatment time is 0.5-4h.

[0030] As a preferred embodiment of the technical solution of the present invention, in step S2, the green plants are water-edge plants.

[0031] As a preferred embodiment of the technical solution of the present invention, the distance between the second wooden pile driven in step (9) and the first wooden pile driven in step (4) is 1.4 to 1.6 m.

[0032] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0033] (1) The bank protection system construction method provided by the present invention is simple and easy to operate in terms of rock roll and plant roll construction methods. The stability of the structure and the survival rate of the plants are ensured through specific arrangement and fixing techniques. The constructed bank protection system not only focuses on the functional protection of the river bank, but also takes into account the environmental beauty. Through the selection and layout of plants, the landscape effect of the river bank is improved, while promoting biodiversity.

[0034] (2) The bank protection system construction method provided by the present invention combines rock rolls and plant rolls to create a bank protection structure that is both strong and eco-friendly. The water edge plants pre-planted in the plant rolls can penetrate the rock rolls and soil downwards as their roots develop, forming a natural reinforcement effect, thereby improving the stability and anti-erosion ability of the river bank.

[0035] (3) The bank protection system construction method provided by the present invention adopts eco-friendly materials such as coconut mats and gravel, which are degradable or naturally recycled, reducing the impact on the environment; at the same time, the design of rock rolls and plant rolls allows the system to adapt to different terrain and hydrological conditions, providing a flexible solution to cope with the dynamic changes of the river.

[0036] (4) The bank protection system construction method provided by the present invention can self-sustain and develop over time compared with traditional hard bank protection, reducing the need for long-term maintenance and repair, and is cost-effective.

[0037] (5) The bank protection system construction method provided by the present invention, the construction method of the rock roll and the plant roll are simple and easy to operate. Through specific arrangement and fixing technology, the stability of the structure and the survival rate of the plants are ensured.

[0038] (6) The bank protection system construction method provided by the present invention provides a rich habitat for aquatic organisms through vegetation restoration of plant rolls, thereby promoting the increase of biodiversity.

[0039] (7) The bank protection system construction method provided by the present invention takes into account the extreme weather events caused by climate change in the system design, can adapt to different environmental pressures, and maintain the long-term stability of the river bank.

[0040] (8) The method for constructing a revetment system provided by the present invention comprises the following steps: the preparation of plant rolls uses environmentally friendly coconut mats or coconut shell fibers as wrapping materials, and pre-planting of green plants is carried out. The planting uses a specific planting matrix, specifically: fermented rice husks and peat soil are used as the main raw materials, and are obtained by adding modified vermiculite and modified attapulgite to form a composite; wherein, rice husks are agricultural and forestry by-products, and their utilization after fermentation is conducive to improving the utilization rate of resources. The fermented rice husks contain rich nutrients, which can provide the necessary nutrients for the growth of green plants. At the same time, the fermented rice husks have Certain adsorption performance; peat soil is a common green plant nutrient matrix, which can provide comprehensive nutrients for green plants; there have been some reports on the actual use of vermiculite and attapulgite, but most of them are directly used. Vermiculite has good water retention capacity, and its unique flaky structure is beneficial to the permeability of the matrix. After it is modified with hydrochloric acid, it is beneficial to increase the specific surface area and further improve its adsorption performance; attapulgite has good water retention performance. After it is subjected to high-temperature alkali treatment in the present invention, it is beneficial to enrich its pore structure and further improve its adsorption performance. In short, the present invention relies on the structural design of the plant roll to improve the survival rate of pre-planted plants; at the same time, after the coconut mat or coconut shell fiber used is slowly degraded, the planting matrix can not only meet the growth of green plants, but also play a role in improving soil performance, further promoting the growth of green plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic structural diagram of the bank protection system provided by the present invention.

[0042] Figure 2 This is a schematic diagram of the actual planting effect of Example 2 of the present invention. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present invention more clearly explained, the present invention will be further explained in detail below in conjunction with the embodiments of the specification.

[0044] See also Figure 1 The present invention provides a method for constructing a plant-rock composite biological structure bank protection system, comprising the following steps:

[0045] (1) After determining the location underwater, rock cutting is performed to obtain a rock shelf to provide support for the placement of the rock roll;

[0046] (2) digging a trench on the shore side of the rock shelf for placing a first twisted rope to secure the rock roll; the rock roll is made of crushed stone filled in a nylon net;

[0047] (3) Placing the rock roll on the rock shelf;

[0048] (4) driving the first wooden stake through the nylon mesh of the rock roll into the soil on the side of the rock roll away from the shore;

[0049] (5) securing the rock roll to the first stake using a first twist rope;

[0050] (6) backfilling the trench excavated in step (2);

[0051] (7) Placing a plant roll on the shore side of the rock roll;

[0052] (8) Gravel backfilling is performed where the plant rolls are placed;

[0053] (9) driving a second wooden stake into the side of the plant roll away from the shore, and securing the plant roll to the second wooden stake using a second twist rope;

[0054] (10) Seeding of green plants on the slope of the plant roll away from the shore.

[0055] The above technical solution provides a solution that is both strong and eco-friendly through the innovative use of rock rolls and plant rolls. The rock rolls are made of crushed stone filled in a nylon mesh, while the plant rolls are pre-planted with marginal aquatic plants in dense coconut mats or coconut shell fibers. This design not only enhances the physical stability of the riverbank, but also promotes the growth of natural vegetation and restores the ecological function of the riverbank. As the plant roots develop, they are able to strengthen the soil and improve the riverbank's resistance to erosion. In addition, the system is designed with flexibility and adaptability in mind, and can adapt to different terrain and hydrological conditions, while providing the dual value of environmental aesthetics and ecological function. Over time, the system is able to self-sustain, reducing the need for long-term maintenance, and is a cost-effective and environmentally sustainable method of riverbank protection.

[0056] See also Figure 1 In step (1), by cutting the rock in the underwater position near the bank of the riverbed, necessary support can be provided for the placement of the rock roll. The underwater depth of the rock rack should not be too deep, preferably 0.4 to 0.5 m, such as 0.45 m; the specifications of the rock rack should be able to accommodate a certain amount of rock rolls, and the length can be 2 m, 3 m, 5 m, 10 m, 20 m, etc., and the width is preferably in the range of 0.5 to 0.7 m, such as 0.6 m.

[0057] See also Figure 1 In step (2), the upper rear side of the rock roll refers to the side away from the river surface and close to the shore; the excavated groove is used to place the twisted rope to fix the rock roll; the excavation specifications of the groove are mainly based on being able to accommodate the twisted rope, and should not be too large or too small; the twisted rope is a rope-type product, which plays a fixing role in the present invention and is purchased from the market.

[0058] See also Figure 1 In step (2) or (3), the rock roll is made of crushed stone filled in a nylon mesh, and the mesh size of the nylon mesh can be selected according to the specifications of the crushed stone. The crushed stone can come from a common construction market or construction waste.

[0059] See also Figure 1 In step (4), the first wooden pile is driven into a position close to the river bank, that is, the first wooden pile is driven into the rear of the rock roll away from the river bank to further fix the rock roll.

[0060] See also Figure 1 , in step (5), the rock roll is secured to the first stake using a first torsion rope to achieve long-term stability and flexibility.

[0061] See also Figure 1 In step (6), soil backfill is used to ensure the stability of the rock roll.

[0062] See also Figure 1 In step (7), the material used for the plant roll is eco-friendly. Specifically, its preparation includes the following steps:

[0063] S1, preparing planting matrix;

[0064] S2. After wrapping the roots of the green plants with the planting matrix, place it on coconut mat or coconut shell fiber, and then tie up the coconut mat or coconut shell fiber with hemp rope to wrap the roots of the green plants wrapped with the planting matrix.

[0065] In the above technical scheme, in simple terms, the preparation of plant rolls is to pre-plant green plants wrapped with planting matrix with coconut mats or coconut shell fibers; wherein, coconut mats or coconut shell fibers can be purchased from the market, or prepared by existing methods, such as coconut shell fibers have been used and reported in many prior arts, and the present invention does not limit its source. The use of coconut mats or coconut shell fibers is environmentally friendly and degradable, and can be decomposed in the soil as the green plants grow. The wrapping of the roots of green plants with coconut mats or coconut shell fibers can be full wrapping or partial wrapping; the wrapping amount of the planting matrix of the roots of green plants can be flexibly selected by those skilled in the art, and it should not be too much. It should also be noted that in step S2, the green plants are water edge plants, and common beauty grass, stone calamus, fish grass, etc. can be selected.

[0066] In the above technical solution, the preparation of the planting matrix includes the following steps:

[0067] S11, mixing the rice husks with the composite bacteria, and naturally stacking and fermenting them for 7 to 14 days (the internal temperature of the pile is about 60 to 75° C.), to obtain the fermented rice husks for later use;

[0068] S12, grinding the vermiculite raw material to 150-250 mesh after cleaning, and then stirring in hydrochloric acid; after the treatment is completed, filtering, washing, drying, and finally grinding to 100-200 mesh to obtain modified vermiculite, which is reserved;

[0069] S13, mixing attapulgite with sodium hydroxide, treating at high temperature, and grinding to 80-150 mesh after the treatment to obtain modified attapulgite for later use;

[0070] S14, 15-25 parts by mass of peat soil, 25-40 parts by mass of fermented rice husks, 20-30 parts by mass of modified vermiculite, 15-25 parts by mass of modified attapulgite, and 1-1.5 parts by mass of water are mixed and stirred to obtain a planting medium.

[0071] In the above technical scheme, the preparation of the planting matrix uses rice husks, modified vermiculite, modified attapulgite and a very small amount of water as raw materials, which can be obtained by simple stirring; the above raw materials are common and low in cost, and through the compound use of various substances, while ensuring the provision of sufficient nutrients, it also has excellent water retention, soil repair and other functions, and has strong functionality.

[0072] In the above technical solution, in step S11, the mass ratio of rice husk to composite bacteria is 1:0.06-0.1, and the composite bacteria is composed of equal masses of Bacillus subtilis and yeast; wherein the effective viable count of Bacillus subtilis is not less than 10 billion / gram, and the effective viable count of yeast is 3.6 million / gram. The above bacteria are all purchased from the market, such as Bacillus subtilis purchased from Hubei Angel Bio Group Co., Ltd., and yeast purchased from Angel Yeast Co., Ltd.

[0073] In the above technical solution, in step S12, the concentration of hydrochloric acid is 0.5-1 mol / L, the stirring treatment temperature is 90-95° C., and the treatment time is 2-6 hours. It is understandable that the above stirring temperature and treatment time can be flexibly selected and adjusted.

[0074] In the above technical solution, in step S13, the mass ratio of attapulgite to sodium hydroxide is 1:0.4-0.6, the high temperature treatment temperature is 780-800°C, and the treatment time is 0.5-4h. It is understandable that the mass ratio of attapulgite to sodium hydroxide can be 1:0.4, 1:0.5, 1:0.6, etc., and the ratio can be flexibly optimized by those skilled in the art.

[0075] In the above technical solution, the peat soil can be purchased from the market, or can be obtained from river bottom mud; preferably, it is obtained from river bottom mud.

[0076] See also Figure 1 , in step (8), gravel is backfilled to provide additional support for the plant roll.

[0077] See also Figure 1 After step (8) and before step (9), a plant tray may be fixed above the plant roll to increase the range of marginal vegetation and improve the restoration capacity of the ecosystem. The plant tray may be a common structural type on the market, and the present invention does not specifically limit or describe its structure.

[0078] See also Figure 1 In step (9), the distance between the second wooden pile driven in and the first wooden pile driven in step (4) is 1.4 to 1.6 m; preferably, the distance is 1.5 m.

[0079] See also Figure 1In step (10), green plants are sown on the slope above the plant roll to promote vegetation growth and enhance the ecological function of the river bank. The green plants sown can be common trees, shrubs, etc., such as beauty grass, ophiopogon, ivy, water lily, etc.

[0080] Example 1

[0081] A method for preparing a plant roll comprises the following steps:

[0082] S1, preparing planting matrix;

[0083] S2. After wrapping the roots of the green plants with the planting substrate, place them on a coconut mat, and then tie up the coconut mat with a hemp rope to wrap the roots of the green plants wrapped with the planting substrate.

[0084] The preparation of the planting matrix includes the following steps:

[0085] S11, mixing rice husks with composite bacteria (Bacillus subtilis and yeast in a mass ratio of 1:1) in a mass ratio of 1:0.08, and naturally stacking and fermenting for 10 days to obtain fermented rice husks for later use;

[0086] S12, the vermiculite raw material is cleaned and ground to 200 mesh, and then stirred in 0.8 mol / L hydrochloric acid at 95° C. for 3.5 h; after the treatment is completed, it is filtered, washed, and dried, and finally ground to 150 mesh to obtain modified vermiculite for standby use;

[0087] S13, mixing attapulgite and sodium hydroxide in a mass ratio of 1:0.5, treating at 785° C. for 2 h, and grinding to 100 mesh after the treatment to obtain modified attapulgite for later use;

[0088] S14, 20 parts by mass of peat soil, 30 parts by mass of fermented rice husks, 25 parts by mass of modified vermiculite, 20 parts by mass of modified attapulgite, and 1 part by mass of water are mixed and stirred to obtain a planting medium.

[0089] Example 2

[0090] A method for constructing a plant-rock composite biological structure revetment system comprises the following steps:

[0091] (1) After determining the location underwater, rock cutting is performed to obtain a rock shelf to provide support for the placement of the rock roll;

[0092] (2) digging a trench on the shore side of the rock shelf for placing a first twisted rope to secure the rock roll; the rock roll is made of crushed stone filled in a nylon net;

[0093] (3) Placing the rock roll on the rock shelf;

[0094] (4) driving the first wooden stake through the nylon mesh of the rock roll into the soil on the side of the rock roll away from the shore;

[0095] (5) securing the rock roll to the first stake using a first twist rope;

[0096] (6) backfilling the trench excavated in step (2);

[0097] (7) placing a plant roll (prepared in Example 1) on the side of the rock roll located on the shore;

[0098] (8) Gravel backfilling is performed where the plant rolls are placed;

[0099] (9) driving a second wooden stake into the side of the plant roll away from the shore, and securing the plant roll to the second wooden stake using a second twist rope;

[0100] (10) Seeding of green plants on the slope of the plant roll away from the shore.

[0101] The bank protection system is constructed according to this embodiment, and its practical application effect is as follows: Figure 2 As shown, it has very good ecological effects, specifically:

[0102] 1. Enhanced bank stability: Rock rolls provide immediate physical protection against further erosion, while plant rolls enhance soil cohesion and bank stability as plant roots develop.

[0103] 2. Ecological restoration and biodiversity: The aquatic plants in the plant volume provide the necessary vegetation cover for riparian ecosystems, promote the restoration of biodiversity, and provide habitats for aquatic organisms and amphibians.

[0104] 3. Aesthetic enhancement: As the plants grow, the natural beauty of the riverbank is enhanced, which enhances the attractiveness of the river landscape and provides a more pleasant recreational environment for the local community.

[0105] 4. Long-term self-maintenance: The deep penetration of plant roots into the soil helps to form a natural self-maintenance mechanism, reducing dependence on artificial maintenance and reducing long-term maintenance costs.

[0106] 5. Adaptable: The system’s design allows it to adapt to different terrain and hydrological conditions, making it a flexible solution suitable for a variety of riparian environments.

[0107] 6. Reduce sediment loss: The presence of vegetation slows down the flow of water, reduces sediment loss due to erosion, and helps maintain water quality and riverbed stability.

[0108] 7. The bank protection system provided by the present invention has high stability, can withstand the scouring of high-velocity river water, and has good safety. In the initial stage of system construction, it can withstand the test of 2m / s water flow and meet the construction needs under different ecological environments.

[0109] In the present invention, in order to further explore the effect of the planting matrix prepared by the present invention, a comparative study of Example 1, Comparative Example 1 and Comparative Example 2 was carried out.

[0110] Comparative Example 1

[0111] In this comparative example, the preparation of the planting matrix includes the following steps:

[0112] S11, mixing rice husks with composite bacteria (Bacillus subtilis and yeast in a mass ratio of 1:1) in a mass ratio of 1:0.08, and naturally stacking and fermenting for 10 days (the fermentation temperature of the pile material reaches about 70° C.), to obtain fermented rice husks for later use;

[0113] S12, after the vermiculite raw material is cleaned, it is ground to 150 mesh, and dried to obtain vermiculite powder, which is for standby use;

[0114] S13, after mixing attapulgite and sodium hydroxide in a mass ratio of 1:0.5, treating at 785° C. for 2 h, grinding to 100 mesh after the treatment to obtain modified attapulgite, which is set aside;

[0115] S14, 20 parts by mass of peat soil, 30 parts by mass of fermented rice husks, 25 parts by mass of vermiculite powder, 20 parts by mass of modified attapulgite and 1 part by mass of water are mixed and stirred to obtain a planting medium.

[0116] Comparative Example 2

[0117] In this comparative example, the preparation of the planting matrix includes the following steps:

[0118] S11, mixing rice husks with composite bacteria (Bacillus subtilis and yeast in a mass ratio of 1:1) in a mass ratio of 1:0.08, and naturally stacking and fermenting for 10 days (the fermentation temperature of the pile material reaches about 70° C.), to obtain fermented rice husks for later use;

[0119] S12, the vermiculite raw material is cleaned and ground to 200 mesh, and then stirred in 0.8 mol / L hydrochloric acid at 95° C. for 3.5 h; after the treatment is completed, it is filtered, washed, and dried, and finally ground to 150 mesh to obtain modified vermiculite for standby use;

[0120] S13, grinding the attapulgite to 100 mesh to obtain attapulgite powder for later use;

[0121] S14, 20 parts by mass of peat soil, 30 parts by mass of fermented rice husks, 25 parts by mass of modified vermiculite, 20 parts by mass of attapulgite powder, and 1 part by mass of water are mixed and stirred to obtain a planting medium.

[0122] Next, the performance test of the planting substrates prepared in Example 1 and Comparative Example 1 and Comparative Example 2 was performed, and the specific method was as follows:

[0123] A. The planting substrate prepared in Example 1, Comparative Example 1 and Comparative Example 2 is mixed with natural water and brown sugar in a mass ratio of 1:0.25:0.005, and the substrate is obtained after mixing.

[0124] B. Planting the collected reeds and Hydrilla verticillata in the above substrate and placing them in the aerobic section of the sewage treatment A / O system;

[0125] C. At intervals of about 7 days, weigh the sugar source, water and enzyme bacteria (based on 100 parts of the substrate, the mass ratio of the substrate to each substance is 100:0.5:5:1.1), mix them and spray them into the above-mentioned substrate, then put the substrate planted with reeds and Hydrilla verticillata back, and test the effluent quality of the sewage system after 24 hours of treatment.

[0126] The test results are shown in Table 1.

[0127] Table 1

[0128] Chroma / dilution factor BOD5, mg / L CODCr, mg / L Ammonia nitrogen, mg / L Example 1 68 70 130 25 Comparative Example 1 85 95 185 50 Comparative Example 2 82 101 170 46

[0129] It can be seen from Table 1 that the planting matrix provided by the present invention has a very good effect on sewage treatment and has a good sewage purification function.

[0130] The above description describes the preferred implementation of the present invention, which should not be regarded as limiting the scope of protection of the claims of the present invention. Any modification, equivalent replacement and improvement without departing from the principle and idea of ​​the present invention should be regarded as within the scope of protection of the claims of the present invention.

Claims

1. A method for constructing a plant-rock composite biological structure bank protection system, characterized in that: The steps include: (1) After determining the location underwater, rock cutting is performed to obtain a rock shelf to provide support for the placement of the rock roll; (2) digging a trench on the shore side of the rock shelf for placing the first twist rope to secure the rock roll; The rock roll is made of crushed stone filled in a nylon mesh; (3) Placing the rock roll on the rock shelf; (4) Drive the first wooden stake into the soil on the side of the rock roll away from the shore through the nylon mesh of the rock roll; (5) securing the rock roll to the first stake using a first twist rope; (6) backfilling the trench excavated in step (2); (7) Placing a plant roll on the shore side of the rock roll; (8) Gravel backfilling at the location where the plant rolls are placed; (9) driving a second wooden stake into the side of the plant roll away from the shore, and securing the plant roll to the second wooden stake using a second twist rope; (10) Seeding of green plants is carried out on the slope of the plant roll away from the shore.

2. The method for constructing a plant-rock composite biological structure revetment system according to claim 1, characterized in that: In step (4), the first wooden pile is driven into a position close to the river bank.

3. The method for constructing a plant-rock composite biological structure revetment system according to claim 1, characterized in that: In step (7), the preparation of the plant rolls comprises the following steps: S1, preparing planting matrix; S2. After wrapping the roots of the green plants with the planting substrate, place the substrate on a coconut mat or coconut shell fiber, and then tie up the coconut mat or coconut shell fiber with a hemp rope to wrap the roots of the green plants wrapped with the planting substrate.

4. The method for constructing a plant-rock composite biological structure revetment system according to claim 3, characterized in that: In step S1, the preparation of the planting matrix includes the following steps: S11, mixing the rice husks with the composite bacteria, and naturally stacking and fermenting them for 7 to 14 days to obtain the fermented rice husks for later use; S12, grinding the vermiculite raw material to 150-250 mesh after cleaning, and then stirring in hydrochloric acid; after the treatment is completed, filtering, washing, drying, and finally grinding to 100-200 mesh to obtain modified vermiculite, which is standby; S13, after mixing attapulgite and sodium hydroxide, treating at high temperature, after the treatment is completed, grinding to 80-150 mesh, that is, obtaining modified attapulgite, which is set aside; S14, 15-25 parts by mass of peat soil, 25-40 parts by mass of fermented rice husks, 20-30 parts by mass of modified vermiculite, 15-25 parts by mass of modified attapulgite, and 1-1.5 parts by mass of water are mixed and stirred to obtain a planting medium.

5. The method for constructing a plant-rock composite biological structure revetment system according to claim 4, characterized in that: In step S11, the mass ratio of rice husk to composite bacteria is 1:0.06-0.1, and the composite bacteria is composed of Bacillus subtilis and yeast in equal masses.

6. The method for constructing a plant-rock composite biological structure revetment system according to claim 4, characterized in that: In step S12, the concentration of hydrochloric acid is 0.5-1 mol / L, the stirring treatment temperature is 90-95° C., and the treatment time is 2-6 h.

7. The method for constructing a plant-rock composite biological structure revetment system according to claim 4, characterized in that: In step S13, the mass ratio of attapulgite to sodium hydroxide is 1:0.4-0.6, the high temperature treatment temperature is 780-800°C, and the treatment time is 0.5-4h.

8. The method for constructing a plant-rock composite biological structure revetment system according to claim 4, characterized in that: In step S2, the green plants are water-edge plants.

9. The method for constructing a plant-rock composite biological structure revetment system according to claim 1, characterized in that: The distance between the second wooden pile driven in step (9) and the first wooden pile driven in step (4) is 1.4-1.6 m.

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