Microbial solidified fish-scale pit based on concrete waste and preparation method of microbial solidified fish-scale pit

Abstract

The invention provides a microorganism curing fish-scale pit based on concrete waste and a preparation method of the microorganism curing fish-scale pit based on the concrete waste. The microorganism curing fish-scale pit comprises concrete broken materials, microorganism curing bacterium liquid, cementing liquid and natural coconut fiber, the strength and internal friction force of the whole material are increased, good attachment and biomineralization action points are provided for microorganisms, and a large number of microorganisms can generate calcium carbonate crystals to bond soil particles and short coconut fiber materials with the attachment points. The short coconut fiber is a reinforced body of the integrally cured material, has good toughness and tensile strength, and can enhance the mechanical strength and erosion resistance of the cured material, the fish-scale pit has good mechanical strength, erosion resistance, durability and ecological environmental protection property, the concrete waste and local soil are used as main materials, and the cost is reduced. And a whole is formed by utilizing a mineralization reaction principle of a microbial strain and natural coconut fibers, so that the requirements of energy conservation and low carbon are met.

Description

Technical Field

[0001] The invention belongs to the technical field of slope soil and water loss prevention and control, and relates to a microbial solidification fish scale pit based on concrete waste and a preparation method thereof. Background Art

[0002] Fish scale pits are an engineering measure for controlling soil erosion on the Loess Plateau. They are a project that uses pits dug on gully-cut and broken slopes or steep slopes to level the land and plant trees. The layout of the pits on the slopes is arranged in a fish scale shape, so they are called fish scale pits. The construction materials of the embankments outside the pits are currently mainly divided into four types. The first type is made by excavating, backfilling, shaping, and compacting local soil. The second type is made by piling up local stone and block stones. The third type is made by adding sand and gravel to cement to form concrete. The fourth type is directly built with organic materials and pre-buried frames. The first two methods are constructed with natural local materials, but the earth embankments and rock embankments have poor overall mechanical properties and are easily eroded and damaged under the conditions of heavy rain runoff. The soil particles of the earth embankment will be dispersed and the pit structure will be damaged when eroded. Part of the rock embankment of the stone embankment will be washed away by the water flow, and the structure will be damaged. Concrete embankments and organic material frame embankments have strong anti-scouring ability and integrity, but they use a lot of cement and organic materials, consume a lot of energy in the production process, do not meet the needs of energy saving and low carbon, and have poor environmental protection and ecological compatibility. Concrete waste is a kind of construction waste that is difficult to handle. Most of the treatment methods are landfill treatment. Its difficult to degrade characteristics make it cause certain damage to the environment. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a microbial solidification fish scale pit based on concrete waste and a preparation method, which can have good mechanical strength, corrosion resistance, durability and ecological environmental protection. The construction materials used are mainly recycled concrete waste and local soil, and the mineralization reaction principle of microbial strains and natural coconut shell fiber are utilized to form a whole, which meets the requirements of energy saving and low carbon.

[0004] The present invention is achieved through the following technical solutions: A method for preparing a microbial solidified fish scale pit based on concrete waste, comprising: S1, select the slope to be treated, choose the location of the fish scale pit, dig the pit, and spray water on the pit surface. S2, mixing concrete crushed materials, short coconut shell fibers, microbial liquid, cementing liquid and water in proportion to obtain a mixture; S3, using the mixture to build a bank along the pit body, adding long coconut shell fiber to the bank body during the construction of the bank body, and then covering part of the mixture on the surrounding slope of the pit body; S4, after the construction is completed, the anti-filtration water conducting layer, the seepage reduction water conducting layer, the nutrient slow-release layer and the surface covering layer are laid in sequence from bottom to top at the bottom of the pit body with the embankment. After the laying is completed, the microbial liquid and the cementing liquid are sprayed on the surface of the embankment and the surface of the covering mixture in the pit body, so as to prepare a microbial solidification fish scale pit based on concrete waste.

[0005] Preferably, in S3, during the construction of the ridge, 6 to 15 long coconut shell fibers are added to the mixture every 10 cm along the ridge.

[0006] Preferably, the mass ratio of the concrete crushed material: water: short coconut shell fiber: microbial liquid: binder is 46:40:4.5:0.5:3:6.

[0007] Preferably, the reverse filtration water conducting layer is paved with crushed concrete, and the thickness of the crushed concrete is 5 cm; The seepage-reducing water-conducting layer is paved by mixing 5% by mass of Na-bentonite into the original soil, and its thickness is 10 cm; The nutrient slow-release layer is paved by mixing raw soil, cellulose, soybean rhizobium agent, xanthan gum, short coconut shell fiber, montmorillonite powder, compound microbial fertilizer and water-retaining agent, wherein the mass ratio of cellulose, soybean rhizobium agent, xanthan gum, short coconut shell fiber, montmorillonite powder and compound microbial fertilizer is 2:10:3:15:3:180:12, and the thickness is 10 cm; The surface covering layer is made of original soil, and shrubs and trees are mixed into the original soil or seedlings are planted, and long coconut shell fibers and fallen leaves are laid on the surface of the original soil.

[0008] Preferably, the pit body is a semi-elliptical structure; the diameter of the long side of the pit body is 90-130 cm, the diameter of the short side is 75-105 cm, and the depth is 60-80 cm; the top width of the ridge body is 10 cm and the height is 20-25 cm.

[0009] Preferably, the microbial solidified bacterial liquid is obtained by active treatment, cultivation and propagation of Bacillus pasteurianus and Brevibacterium frostbitum. The culture medium of the microbial solidified bacterial liquid adopts CASO AGAR. After culturing for 36 hours in a constant temperature shaker at 30°C and 200 rpm, a highly active microbial solidified bacterial liquid is obtained, and the qualified pH measurement value of the microbial solidified bacterial liquid is greater than 8.5.

[0010] Preferably, the concrete crushing material is obtained by crushing, screening and high-pressure water washing of waste concrete blocks collected from building dismantling; The concrete crushing material comprises a coarse aggregate group and a fine aggregate group, wherein the mass ratio of the coarse aggregate group in the concrete crushing material is not less than 75%, and the rest is the fine aggregate group; the particle size of the coarse aggregate group is greater than 5mm and less than 15mm, and the particle size of the fine aggregate group is less than 5mm.

[0011] Preferably, the binder is formed by mixing a 1.5 mol / L calcium chloride solution and a 1.5 mol / L urea solution in a volume ratio of 1:1.

[0012] Preferably, the length of the long coconut shell fiber is 8-30 cm, and the length of the short coconut shell fiber is 1.5-2.5 cm.

[0013] A microbial solidified fish scale pit based on concrete waste is prepared by a preparation method of the microbial solidified fish scale pit based on concrete waste.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a microbial solidification fish scale pit based on concrete waste and a preparation method thereof, wherein the raw materials include concrete crushing material, microbial solidification bacterial liquid, cementing liquid and natural coconut shell fiber, wherein the concrete crushing material is the "skeleton" structure of the overall mixed solidified material, which increases the overall material strength and internal friction and provides good attachment and biomineralization points for microorganisms, and a large number of microorganisms will use this as an attachment point to generate calcium carbonate crystals to cement soil particles and short coconut shell fiber materials. Short coconut shell fiber is the reinforcement of the overall solidified material, which has good toughness and tensile strength, can enhance the mechanical strength and erosion resistance of the solidified material, and the rough surface of the fiber also provides a good reaction site for microbial attachment and biomineralization. The concrete crushing material and the fiber form the "skeleton" support structure and "fascia" connection structure of the overall solidified material, a new material and method for preventing and controlling soil erosion on slopes with durability, erosion resistance and environmental protection. Compared with existing earth ridges, stone ridges and organic material ridges, the fish scale pit ridge body formed by the present invention can have good mechanical strength, anti-erosion performance, durability and ecological environmental protection. The construction materials used are mainly recycled concrete waste and local soil, and the mineralization reaction principle of microbial strains and natural coconut shell fibers are used to form a whole, which meets the requirements of energy saving and low carbon. The pit slope covering layer formed by the present invention increases the anti-runoff and water scouring capabilities of the overall structure, making the overall structure more stable and reliable. At the same time, the mixed covering layer guides water into the pit body to improve the overall effect.

[0015] Furthermore, the layered structure at the bottom of the pit can improve the water storage capacity of the pit and the nutrient supply capacity for vegetation growth, and can maximize the ability of the fish scale pit to restore vegetation and reduce slope runoff and soil erosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional structural diagram of a fish scale pit for microbial solidification of concrete waste according to the present invention; Figure 2 This is a top view of the structure of the fish scale pit based on concrete waste solidification by microorganisms arranged on a slope surface according to the present invention; Figure 3 The present invention is a flow chart of the preparation of the microbial solidification fish scale pit based on concrete waste; In the figure: embankment 1, reinforcement layer 2, layered paving structure of pit body 3, reverse filtration and water conduction layer 31, seepage reduction and water retention layer 32, nutrient slow-release layer 33, surface covering layer 34. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0018] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0019] The present invention provides a microbial solidified fish scale pit based on concrete waste and a preparation method thereof, a new material and a new method for preventing and controlling soil erosion on slopes that are both durable, erosion-resistant and environmentally friendly; This patent provides a method for preparing fish scale pits based on microbial solidification of concrete waste. The main steps include material preparation, on-site pit excavation, material mixing and backfilling, pit bottom layer paving, bacterial liquid and cementing liquid spraying, such as Figure 3 shown.

[0020] (1) First, prepare the raw materials of concrete crushed materials, microbial solidifying bacterial liquid, cementing liquid, and natural coconut shell fibers. The concrete crushed materials are obtained by crushing, screening, and high-pressure water flushing of waste concrete blocks collected from building demolition. The particle size requirement is less than 15 mm, which is divided into a coarse aggregate group (>5 mm) and a fine aggregate group (<5 mm). The mass ratio of the coarse aggregate group is not less than 75%, and the high-pressure water flushing time is not less than 10 minutes. The flushing is to remove the alkaline substances on the surface of the crushed materials and the remaining cement powder ash. The microbial solidifying bacterial liquid is obtained by the active treatment, cultivation, and propagation of Bacillus pasteurii (for the normal temperature area) and Brevibacterium frigoritolerans (for the alpine area) strains. The culture medium is CASO AGAR, and it is cultured in a constant temperature shaker at 30°C and 200 rpm for 36 h to obtain a highly active bacterial liquid. The qualified pH measurement value of the 36-h bacterial liquid needs to be greater than 8.5. The cementing liquid is composed of a 1.5 mol / L calcium chloride solution and a 1.5 mol / L urea solution mixed in a ratio of 1:1. After the two are prepared, they are not mixed first and are mixed and shaken well during use. The natural coconut shell fibers are obtained after coconut shell processing, mechanical beating, and selection, and are respectively cut into long coconut shell fibers and short coconut shell fibers after shearing treatment. The length of the long coconut shell fibers is controlled at 8 - 30 cm, and the length of the short coconut shell fibers is controlled at 1.5 - 2.5 cm. Among them, the concrete crushed materials are the "skeleton" structure of the overall mixed and solidified materials, increasing the strength and internal friction of the overall materials and providing good attachment and biomineralization sites for microorganisms. A large number of microorganisms will use this as an attachment point to generate calcium carbonate crystals to cement soil particles and short coconut shell fiber materials. The short coconut shell fibers are the reinforcing bodies of the overall solidified materials. They have good toughness and tensile strength, can enhance the mechanical strength and erosion resistance of the solidified materials, and the rough surface of the fibers also provides good reaction sites for microbial attachment and biomineralization. The concrete crushed materials and fibers form the "bone" support structure and "fascia" connection structure of the overall solidified materials.

[0021] (2) On-site pit excavation: Select the slope to be treated, design the proposed construction positions of each fish-scale pit in a "pin" shape, and excavate a pit with a semi-elliptical structure at the selected position. The long diameter of the pit is controlled at 90 - 130 cm, the short diameter is controlled at 75 - 105 cm, and the excavation depth is 60 - 80 cm. Level the surface of the excavated pit and spray a small amount of water.

[0022] (3) Material mixing and backfilling: Take out part of the excavated original soil, mix them evenly in the mass ratio of original soil: concrete crushed material: water: short coconut shell fiber: microbial solution: binder in a ratio of 46:40:4.5:0.5:3:6, and stir them thoroughly to obtain a mixture. The stirring time should be no less than 5 minutes. A small amount of water and microbial solution can be added during the stirring process. Two "U"-shaped plastic baffles are inserted obliquely into the outside of the excavated pit and the edge of the pit, respectively, with the insertion depth being about 1 / 4 of the height of the baffles. The soil between the baffles is removed and the evenly mixed mixture is filled into the space between the baffles. Fill and compact. After filling, let it stand for 30 minutes and then slowly pull out two plastic boards. Smooth the surface of the mixture to form a ridge structure. The top width of the ridge is 10cm and the height is 20-25cm. Add long coconut shell fibers during the construction process to ensure that 6 to 15 long coconut shell fibers are mixed in every 10cm. About 1 / 4 of the ridge is buried underground. The ridge can be lightly tamped and leveled on the surface according to the situation to ensure a lower roughness. Use the remaining mixture to cover the surrounding slopes of the excavated pit to form a reinforcement layer with a covering thickness of not less than 2cm. The bottom of the pit is not covered.

[0023] (4) Layered paving at the bottom of the pit: After the bottom of the pit is leveled, a 5-cm-thick layer of crushed concrete is first laid as a filter water-conducting layer. When there is too much water in the pit, it can effectively drain the water. Then a 10-cm-thick water-reducing layer is laid. The water-reducing layer is made by evenly mixing 5% by mass of nano-bentonite into the original soil. The main purpose is to reduce the permeability coefficient and increase the water retention capacity of the entire pit. Then a 10-cm-thick nutrient slow-release layer is laid. The main purpose of this soil layer is to provide slowly released nutrients for the vegetation to be planted later. It is mainly composed of original soil, cellulose, and soybean nodules. It is composed of bacterial agent, xanthan gum, short coconut shell fiber, montmorillonite powder, compound microbial fertilizer and water retaining agent, wherein the mass ratio of original soil, cellulose, soybean rhizobium agent, xanthan gum, short coconut shell fiber, montmorillonite powder, compound microbial fertilizer and water retaining agent is 7000:2:10:3:15:3:180:12; after the nutrient slow-release layer is laid, the surface covering layer is laid, and the surface covering layer is paved with loose original soil, and a certain amount of shrubs and trees or seedlings can be placed in the original soil layer, and an appropriate amount of long coconut shell fiber and surrounding fallen leaves are scattered on the surface of the original soil.

[0024] (5) Spraying of bacterial solution and binder: Use a spraying hand-held capacity sprayer to spray, adjust the spraying pressure to medium or small, and preferably spray the liquid out of the atomized state. First, use a sprayer filled with microbial bacterial solution to spray the surface of the embankment and the surface of the reinforcement layer in the pit. Spray multiple times, and try not to produce obvious runoff, so that the bacterial solution can penetrate into the embankment and reinforcement layer. 2-3 hours after the bacterial solution spraying, spray the binder evenly on the embankment sprayed with the bacterial solution and the surface of the covering mixture, in small amounts and multiple times, so that it can penetrate completely. Spray 3-7 times according to the above method, with an interval of 24-36 hours between each spraying, and each spray of no less than 300 ml of bacterial solution. The distance between the spraying positions is controlled at 15-20 cm. After each spraying, observe whether there are obvious gaps in the embankment or the positions that have not been sprayed, and spray again to ensure that the entire embankment is fully sprayed and solidified to form a complete and unified whole.

[0025] like Figure 1 and Figure 2 As shown, the ridge body 1 is an elliptical arc structure. The ridge body is formed by shaping, compacting and reinforcing soil, concrete crushed materials, water, short coconut shell fiber, microbial bacterial liquid, cementing liquid mixture and lengthened coconut shell fiber, and is formed by spraying and reinforcing the bacterial liquid and cementing liquid for many times. It has good mechanical properties, anti-erosion performance and integrity, and has low overall permeability. It can effectively block rainwater runoff and make it flow into the pit for infiltration and water storage. The excess runoff will be diverted by the ridge body and continue to flow down the slope with a smaller flow rate. The role of the long coconut shell fiber is to form a friction body that bites each other in the material structure, increase the internal friction of the material, and improve the integrity and crack resistance of the soil ridge. The reinforcement layer 2 is a thin layer formed by the mixture covering the slope surface. After multiple spraying and reinforcement, it plays a role in protecting the slope of the earth pit and guiding water into the earth pit. The layered paving structure 3 of the pit body specifically includes an anti-filtration water-conducting layer 31, which prevents the loss of particles in the upper layer structure and can guide water from the cover layer to the surrounding soil when there is too much water in the pit; a seepage-reducing water-retaining layer 32, which has a lower permeability coefficient than the original soil, so that the pit has sufficient water storage capacity; a nutrient slow-release layer 33, various materials can improve soil structure, adjust soil pH, and slowly release nutrients, providing good conditions for seed germination and seedling growth of trees and shrubs; the surface covering layer 34 is loose backfilled original soil and long coconut shell fibers and fallen leaves. The main structure of this layer retains the microbial flora and seed bank in the original soil, providing relatively primitive local conditions for subsequent vegetation planting.

[0026] Example: Experimental test analysis: Loess was collected from a place in northern Shaanxi and other materials were produced and purchased to make two sets of test samples: (1) dry density of 1.6 g / cm 3 , the moisture content of the test block is 12%; (2) the mass ratio of original soil, concrete crushed materials, water, short coconut shell fiber, microbial liquid, and cementing liquid is 46:40:4.5:0.5:3:6 and they are evenly mixed, with a density of 1.86 g / cm 3specimens, and specimens that were sprayed with microbial bacterial liquid and cementing liquid three times. Their unconfined compressive strength, permeability coefficient, and soil loss rate after 10 minutes of rainfall with a rainfall intensity of 60 mm / h were tested respectively. The results are as follows. It can be seen that the soil strength has increased significantly, and the permeability coefficient and scoured soil loss rate have decreased significantly.

[0027] Table 1: Test data

[0028] The fish-scale pit embankment formed by the present invention can have good mechanical strength, erosion resistance, durability, and ecological environmental protection compared with existing soil embankments, stone embankments, and organic material embankments. The construction materials used are mainly recycled concrete waste and local soil. Using the mineralization reaction principle of microbial strains and natural coconut coir fibers to form a whole, it meets the requirements of energy conservation and low carbon. The formed pit slope covering layer increases the anti-runoff and water erosion resistance of the overall structure, making the overall structure more stable and reliable. At the same time, the mixed material covering layer guides water into the pit body to enhance the overall effect. The stratified structure set at the bottom of the pit can improve the water storage capacity of the pit body and the nutrient supply capacity for vegetation growth, and can maximize the ability of the fish-scale pit to restore vegetation, reduce slope runoff, and soil erosion.

[0029] One of the preferred embodiments: On-site pit excavation: Select the slope to be treated, design the proposed construction positions of each fish-scale pit in a "pin" shape. Excavate a pit with a semi-elliptical structure at the selected position. The long diameter of the pit is controlled at 90 cm, the short diameter is controlled at 75 cm, and the depth is 60 cm. Level the surface of the excavated pit and spray a small amount of water.

[0030] A constructed embankment structure is formed on the surface of the levelled mixture. The top width of the embankment is 10 cm and the height is 20 cm. During the construction process, long coconut coir fibers are added, ensuring that 6 long coconut coir fibers are mixed every 10 cm in length. Spraying of bacterial liquid and cementing liquid: Use a sprayer of microbial bacterial liquid to spray the surface of the embankment and the surface of the reinforcement layer in the pit. It can be sprayed multiple times, and try not to generate obvious runoff as much as possible, so that the bacterial liquid can fully penetrate into the embankment and the reinforcement layer. 2 hours after the spraying of the bacterial liquid is completed, evenly spray the cementing liquid on the embankment and the surface of the covering mixture that has been sprayed with the bacterial liquid, in small amounts and multiple times, so that it all penetrates. Spray 3 times according to the above method, with a time interval of 24 h between each spraying. The amount of bacterial liquid sprayed each time is 300 ml, and the spraying position distance is controlled at 15 cm. The rest of the preparation methods are the same.

[0031] One of the preferred embodiments: on-site pit excavation: select the slope to be treated, design the proposed construction positions of each fish-scale pit in a "pin" shape, excavate a pit with a semi-elliptical structure at the selected position, control the long diameter of the pit at 130 cm, the short diameter at 105 cm, and the excavation depth at 80 cm. Level the surface of the excavated pit and sprinkle a small amount of water. Level the outer surface of the mixture to form a constructed ridge structure with a top width of 10 cm and a height of 25 cm. Add long coconut shell fibers during the construction process, ensuring that 15 long coconut shell fibers are mixed in every 10 cm length. Spraying of bacterial solution and cementing solution: Use a sprayer for the microbial bacterial solution to spray the surface of the ridge and the surface of the reinforcement layer in the pit. Multiple sprays can be carried out, and try not to generate obvious runoff as much as possible, so that the bacterial solution fully penetrates into the ridge and the reinforcement layer. 3 hours after the spraying of the bacterial solution is completed, evenly spray the cementing solution onto the ridge and the surface of the covering mixture that has been sprayed with the bacterial solution in small amounts and multiple times, so that it all penetrates. Spray according to the above method 7 times, with a time interval of 36 h for each spray, 600 ml of bacterial solution for each spray, and the spraying position distance controlled at 20 cm. The remaining preparation methods are the same.

[0032] One of the preferred embodiments: on-site pit excavation: select the slope to be treated, design the proposed construction positions of each fish-scale pit in a "pin" shape, excavate a pit with a semi-elliptical structure at the selected position, control the long diameter of the pit at 110 cm, the short diameter at 85 cm, and the excavation depth at 70 cm. Level the surface of the excavated pit and sprinkle a small amount of water. Level the outer surface of the mixture to form a constructed ridge structure with a top width of 10 cm and a height of 22 cm. Add long coconut shell fibers during the construction process, ensuring that 10 long coconut shell fibers are mixed in every 10 cm length. Spraying of bacterial solution and cementing solution: Use a sprayer for the microbial bacterial solution to spray the surface of the ridge and the surface of the reinforcement layer in the pit. Multiple sprays can be carried out, and try not to generate obvious runoff as much as possible, so that the bacterial solution fully penetrates into the ridge and the reinforcement layer. 2.5 hours after the spraying of the bacterial solution is completed, evenly spray the cementing solution onto the ridge and the surface of the covering mixture that has been sprayed with the bacterial solution in small amounts and multiple times, so that it all penetrates. Spray according to the above method 5 times, with a time interval of 28 h for each spray, 400 ml of bacterial solution for each spray, and the spraying position distance controlled at 18 cm. The remaining preparation methods are the same.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0034] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A method for preparing fish scale pits based on microbial solidification of concrete waste, characterized in that: include, S1, select the slope to be treated, choose the location of the fish scale pit, dig the pit, and spray water on the pit surface. S2, mixing concrete crushed materials, short coconut shell fibers, microbial liquid, cementing liquid and water in proportion to obtain a mixture; S3, using the mixture to build a bank along the pit body, adding long coconut shell fiber to the bank body during the construction of the bank body, and then covering part of the mixture on the surrounding slope of the pit body; S4, after the construction is completed, the anti-filtration water conducting layer, the seepage reduction water conducting layer, the nutrient slow-release layer and the surface covering layer are laid in sequence from bottom to top at the bottom of the pit body with the embankment. After the laying is completed, the microbial liquid and the cementing liquid are sprayed on the surface of the embankment and the surface of the covering mixture in the pit body, so as to prepare a microbial solidification fish scale pit based on concrete waste.

2. The method for preparing a microbial solidified fish scale pit based on concrete waste according to claim 1, characterized in that: In S3, during the construction of the embankment, 6 to 15 long coconut shell fibers were added to the mixture every 10 cm along the embankment.

3. The method for preparing a fish scale pit based on microbial solidification of concrete waste according to claim 1, characterized in that: The mass ratio of the concrete crushed materials: water: short coconut shell fiber: microbial liquid: binder is 46:40:4.5:0.5:3:

6.

4. The method for preparing a microbial solidified fish scale pit based on concrete waste according to claim 1, characterized in that: The reverse filtration water guide layer is paved with crushed concrete, and the thickness of the crushed concrete is 5 cm; The seepage-reducing water-conducting layer is paved by mixing 5% by mass of Na-bentonite into the original soil, and its thickness is 10 cm; The nutrient slow-release layer is paved by mixing raw soil, cellulose, soybean rhizobium agent, xanthan gum, short coconut shell fiber, montmorillonite powder, compound microbial fertilizer and water-retaining agent, wherein the mass ratio of cellulose, soybean rhizobium agent, xanthan gum, short coconut shell fiber, montmorillonite powder and compound microbial fertilizer is 2:10:3:15:3:180:12, and the thickness is 10 cm; The surface covering layer is made of original soil, and shrubs and trees are mixed into the original soil or seedlings are planted, and long coconut shell fibers and fallen leaves are laid on the surface of the original soil.

5. The method for preparing fish scale pits based on microbial solidification of concrete waste according to claim 1, characterized in that: The pit body is a semi-elliptical structure; the diameter of the long side of the pit body is 90-130cm, the diameter of the short side is 75-105cm, and the depth is 60-80cm; the top width of the ridge body is 10cm and the height is 20-25cm.

6. The method for preparing fish scale pits based on concrete waste by microbial solidification according to claim 1, characterized in that: The microbial solidified bacterial liquid is obtained by active treatment, cultivation and propagation of Bacillus pasteurianus and Brevibacterium frostii. The culture medium of the microbial solidified bacterial liquid adopts CASO AGAR. After culturing for 36 hours in a constant temperature shaker at 30°C and 200 rpm, a highly active microbial solidified bacterial liquid is obtained. The qualified pH measurement value of the microbial solidified bacterial liquid is greater than 8.

5.

7. The method for preparing fish scale pits based on microbial solidification of concrete waste according to claim 1, characterized in that: The concrete crushing material is obtained by crushing, screening and high-pressure water washing of waste concrete blocks collected from building dismantling; The concrete crushing material comprises a coarse aggregate group and a fine aggregate group, wherein the mass ratio of the coarse aggregate group in the concrete crushing material is not less than 75%, and the rest is the fine aggregate group; the particle size of the coarse aggregate group is greater than 5mm and less than 15mm, and the particle size of the fine aggregate group is less than 5mm.

8. The method for preparing fish scale pits solidified by microorganisms based on concrete waste according to claim 1, characterized in that: The binder solution is prepared by mixing a 1.5 mol / L calcium chloride solution and a 1.5 mol / L urea solution in a volume ratio of 1:

1.

9. The method for preparing fish scale pits solidified by microorganisms based on concrete waste according to claim 1, characterized in that: The length of the long coconut shell fiber is 8-30 cm, and the length of the short coconut shell fiber is 1.5-2.5 cm.

10. A microbial solidification fish scale pit based on concrete waste, characterized in that: The method for preparing fish scale pits solidified by microorganisms based on concrete waste according to any one of claims 1 to 9 is prepared.

Images