Construction method of solidified sewage pond sewage by field dry mixing solidified soil

Abstract

The present application relates to the technical field of solidifying sewage pond sewage, and discloses a construction method of solidifying sewage pond sewage by on-site dry mixing solidified soil, which comprises the following construction steps: 1) collecting engineering spoil to form soil material; 2) placing solidifying agent in a storage tank, wherein the solidifying agent comprises slag powder, fly ash, waste gypsum, water glass, stone powder slag and slag; 3) mixing the soil material and the solidifying agent in a mixer to form powder solidified material; and 4) scattering the solidified material into the sewage pond, so that the solidified material reacts with the sewage to form a solid landfill body; the construction method of solidifying sewage pond sewage by on-site dry mixing solidified soil has the following advantages: 1) construction waste such as engineering spoil is consumed; 2) construction cost is reduced; 3) the landfill body is more compact and has better impermeability, so that harmful substances can be more effectively fixed and wrapped in the interior of the landfill body; and 4) the construction process is simple.

Description

Technical Field

[0001] This invention patent relates to the technical field of solidifying sewage ponds, specifically to a construction method for solidifying sewage ponds using on-site dry mixing of solidified soil. Background Technology

[0002] When factories or residential areas in the suburbs lack adequate sewage treatment facilities, large amounts of wastewater are discharged into nearby low-lying ponds. Over the years, these ponds gradually form large-scale sewage ponds. The wastewater in these ponds contains various harmful substances that not only directly harm groundwater and soil but also affect the entire ecological environment. The organic matter, malodorous substances, acids, alkalis, and salts in these ponds have a serious impact on the surrounding air, groundwater, and soil.

[0003] Currently, in order to reduce the harm of sewage ponds, two methods are generally used to treat them: 1) collecting sewage, treating it centrally for anaerobic harmlessness, and then discharging it; 2) using inorganic cementing materials to coagulate or solidify the sewage in the sewage pond to reduce the impact of harmful substances in the sewage on the environment.

[0004] In the existing technology, since the first treatment method is more expensive, most sewage ponds are treated using the second method, which involves adding inorganic cementing materials, such as cement and lime, to the sewage pond for solidification.

[0005] Inorganic cementing materials undergo physical and chemical reactions with wastewater to generate a large number of hydrated gels, minerals, and other stone-like substances, such as hydrated calcium silicate, hydrated calcium ferrite, hydrated calcium aluminoferrite, ettringite, calcium carbonate, and calcium hydroxide. The wastewater is solidified in these stone-like substances, which are fixed within them and cannot permeate or migrate outward, thereby reducing their impact on the surrounding environment.

[0006] However, the second method of wastewater treatment has the following drawbacks: 1) The material cost is high. The wastewater in the wastewater pond relies entirely on inorganic cementing materials to solidify, which is equivalent to adding enough cement and lime to the water. The wastewater and cement and lime form a viscous cement slurry, which eventually solidifies and hardens to form a stone body; 2) The stone body formed by mixing inorganic cementing materials such as cement and lime with wastewater has large pores and poor impermeability. Although most of the harmful substances in the wastewater are fixed in the stone body, due to the poor impermeability of the stone body, a small amount of harmful substances will gradually seep out from the stone body, thus polluting the surrounding environment again. Summary of the Invention

[0007] The purpose of this invention is to provide a construction method for solidifying sewage ponds using on-site dry mixing of solidified soil, aiming to solve the problem of high construction costs in existing sewage pond solidification treatment technologies.

[0008] This invention is implemented as follows: a method for on-site dry mixing and solidification of soil for solidifying wastewater ponds, comprising the following construction steps:

[0009] 1) Collect engineering waste soil, crush and screen the engineering waste soil in sequence to form the required soil material;

[0010] 2) Set up storage tanks at the construction site and place the curing agent in the storage tanks. The curing agent includes slag powder, fly ash, waste gypsum, water glass, stone powder slag and furnace slag.

[0011] 3) According to the design ratio, add the soil material and the curing agent into the mixer and mix them to form a powdered curing material. Transport the curing material to the periphery of the sewage pond for storage.

[0012] 4) The solidified material is sprinkled into the sewage pond. After the solidified material and sewage are mixed for a set time, the solidified material and sewage react and combine to form a solid landfill.

[0013] Furthermore, in construction step 3), before transporting the solidified material to the periphery of the sewage pond for storage, measuring instruments are used to determine the periphery of the sewage pond and the landfill area that needs to be filled in the sewage pond, and markers are set at the periphery.

[0014] Furthermore, in construction step 3), debris around the sewage pond is removed to form a construction zone surrounding the sewage pond, and the solidified material is piled up on the construction zone.

[0015] Furthermore, in construction step 1), the moisture content of the collected engineering waste soil is measured and processed to ensure that the moisture content of the engineering waste soil is between 15% and 25%.

[0016] Furthermore, in construction step 1), when the moisture content of the construction waste soil is greater than 15% to 25%, it is spread out to dry until the moisture content of the construction waste soil is between 15% and 25%.

[0017] Furthermore, in construction step 1), the engineering waste soil is placed in a crushing hopper for crushing to form crushed material, and the crushed material is placed in a drum screen for tumbling screening to form soil material with a particle size of less than 50mm.

[0018] Furthermore, in construction step 3), after the soil material is placed in a mixer and stirred independently for a set time, a solidifying agent is sprinkled into the mixer until the solidifying agent is mixed with the soil material to form the solidifying agent.

[0019] Furthermore, in construction step 4), the sewage pond is divided into multiple annular areas from the outer periphery to the center, and the multiple annular areas are arranged in a nested manner, covering the entire sewage pond.

[0020] In construction step 4), along the sewage pond from the outside to the inside, an excavator is used to spread the solidified material into a single annular area. After the solidified material spread into the annular area reacts and combines with the sewage to form a fixed landfill, the solidified material is then spread into the next annular area.

[0021] Furthermore, in construction step 3), the mixer includes a horizontally arranged mixing drum, a horizontally arranged mixing chamber in the mixing drum, a horizontally arranged mixing shaft in the mixing chamber, and a plurality of radial shafts on the outer periphery of the mixing shaft, which are staggered along the axial direction of the mixing shaft.

[0022] The inner end of the radial shaft is connected to the stirring shaft, and the stirring shaft is provided with a spiral blade. The spiral blade is arranged spirally along the circumference of the stirring shaft and is respectively connected and fixed to the outer end of multiple radial shafts. The spiral blade has adjacent segments located on adjacent radial shafts, and the adjacent segments are provided with multiple through holes, which are spaced apart along the length direction of the adjacent segments.

[0023] In construction step 3), after the soil material is placed in the mixing chamber, the mixing shaft rotates horizontally, driving the rotating blades to rotate synchronously. The rotating blades mix the soil material and the curing agent to form a cured material. During the mixing process, the cured material is simultaneously dispersed through the through hole before being mixed again.

[0024] Furthermore, in construction step 3), the inner wall of the mixing chamber is provided with two layers of jet pipes. The jet pipes are arranged around the circumference of the mixing chamber, and the two layers of jet pipes are arranged at intervals along the height direction of the mixing chamber. The jet pipes are provided with multiple jet micro-holes, and the multiple jet micro-holes are arranged along the circumference of the jet pipes and at intervals along the circumference.

[0025] In construction step 3), during the process of the stirring shaft rotating and mixing the curing material, the two layers of jet pipes spray high-pressure gas into the stirring chamber, and the jet pressure of the two layers of jet pipes is different and changes alternately. The high-pressure gas sprayed by the two layers of jet pipes performs multi-directional pneumatic stirring of the curing material.

[0026] Compared with existing technologies ， The on-site dry-mixing method for solidifying soil and solidifying wastewater ponds provided by this invention has the following advantages:

[0027] 1) Construction waste such as engineering spoil is consumed. The engineering spoil used for mixing on site is not limited to the soil near the sewage pond. Engineering spoil from surrounding construction sites can also be transported to the site for use.

[0028] 2) Reduced construction costs. Compared with the traditional process of solidifying sewage entirely with inorganic cementing materials, the proportion of soil and rock solidifying agent in the solidifying agent is relatively small, and most of it is engineering waste soil, which greatly reduces construction costs.

[0029] 3) Using solidifying material to solidify sewage, the solidifying agent not only undergoes a hydration reaction with the sewage, but also undergoes a secondary chemical reaction with some clay minerals in the soil material, generating a landfill containing more hydration gel minerals and crystal minerals. The solidified landfill is more compact and has better impermeability, which can more effectively fix and wrap harmful substances inside the landfill.

[0030] Traditional inorganic cementitious materials solidify wastewater by only undergoing a hydration reaction with water, resulting in a limited number of hydrated gel minerals and crystalline minerals. The solidified stone body has defects such as numerous pores, poor impermeability, and easy leakage of wastewater.

[0031] 4) The construction process is simple. The solidified material is prepared by dry mixing on site and then placed directly into the sewage in the sewage pond. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the process for the on-site dry mixing and solidification of soil and solidification of sewage ponds provided by the present invention;

[0033] Figure 2 This is a partial internal schematic diagram of the mixer provided by the present invention;

[0034] Figure 3 This is a construction schematic diagram of the on-site dry mixing and solidification method for solidifying soil and wastewater ponds provided by the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0037] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0038] Reference Figure 1-3 The image shows a preferred embodiment of the present invention.

[0039] The on-site dry-mixing solidification soil solidification construction method for sewage ponds includes the following construction steps:

[0040] 1) Collect engineering waste soil, crush and screen the engineering waste soil in sequence to form the required soil material;

[0041] 2) Set up storage tanks at the construction site and place the curing agent in the storage tanks. The curing agent includes slag powder, fly ash, waste gypsum, water glass, stone powder slag and furnace slag.

[0042] 3) According to the design ratio, add the soil material and the curing agent into the mixer and mix them to form a powdered curing material 401. Transport the curing material 401 to the periphery of the sewage pond 400 for storage.

[0043] 4) The solidified material 401 is sprinkled into the sewage pond 400. After the solidified material 401 is mixed with the sewage for a set time, the solidified material 401 reacts and combines with the sewage to form a solid landfill 402.

[0044] The above-mentioned on-site dry-mixing solidified soil solidification and wastewater pond construction method has the following advantages:

[0045] 1) Construction waste such as engineering spoil is consumed. The engineering spoil used for mixing on site is not limited to the soil near the sewage pond 400. Engineering spoil from surrounding construction sites can also be transported to the site for use.

[0046] 2) Reduced construction costs. Compared with the traditional process of solidifying sewage entirely with inorganic cementing materials, the proportion of soil and rock solidifying agent in the solidifying agent is relatively small, and most of it is engineering waste soil, which greatly reduces construction costs.

[0047] 3) Solidifying wastewater with solidifying agent 401. The solidifying agent not only undergoes a hydration reaction with the wastewater, but also undergoes a secondary chemical reaction with some clay minerals in the soil material, generating landfill 402 which contains more hydration gel minerals and crystal minerals. The solidified landfill 402 is more compact and has better impermeability, which can more effectively fix and wrap harmful substances inside the landfill 402.

[0048] Traditional inorganic cementitious materials solidify wastewater by only reacting with water through a hydration reaction, resulting in a limited number of hydrated gel minerals and crystalline minerals. The solidified stone body has defects such as numerous pores, poor impermeability, and easy leakage of wastewater.

[0049] 4) The construction process is simple. The solidified material 401 is directly prepared by dry mixing on site and then placed directly into the sewage in the sewage pond 400.

[0050] In this embodiment, the solidification principle of the soil material is as follows:

[0051] Currently, soil stabilizers are composed of various industrial solid wastes and additives, such as slag powder, fly ash, waste gypsum, water glass, stone powder slag, furnace slag, and additives. Industrial solid wastes contain varying degrees of active minerals such as silicon, aluminum, and calcium. With the stimulation of additives, the activity of minerals in various industrial solid wastes can be maximized, enabling them to participate in chemical reactions.

[0052] When the proportions of various industrial solid wastes reach the optimal level, the active silicon, aluminum, calcium and other minerals in these industrial solid wastes can react chemically with water and clay minerals to generate the most hydrated gel minerals and other crystalline minerals.

[0053] Compared to traditional cement materials, the active minerals in industrial solid waste, as well as the minerals that have been activated, not only react chemically with water to form hydrated gel minerals and other crystalline minerals, but also react further with clay minerals in the soil to form hydrated gel minerals and other crystalline minerals.

[0054] Therefore, when solidifying agents composed of industrial solid waste are mixed with soil materials, more hydrated gel minerals and other crystalline minerals can be generated. These hydrated gel minerals and crystalline minerals grow within the soil materials, connecting soil particles that have not participated in the chemical reaction on the one hand, and encapsulating the soil particles on the other hand, giving the solidified soil materials higher strength, impermeability, water stability and corrosion resistance.

[0055] In this embodiment, the specific amount of curing material 401 used is as follows:

[0056] Based on numerous experiments, the minimum density of solidified material 401 after adding water is generally 1.35 t / m³. 3That is, the density of the solidified material 401 after adding water is less than 1.35 t / m³. 3 The curing agent 401 failed to solidify due to excessive moisture content, and its strength decreased rapidly.

[0057] The weight of dried soil required per ton of wastewater is calculated using the following formula:

[0058]

[0059] The derivation of the formula is as follows:

[0060]

[0061] m 固 —The weight of the curing agent, in tons, can be calculated using the following formula.

[0062] m 固 =αm 湿

[0063] α—The weight ratio of the curing agent to the soil material, expressed as a percentage, typically 20-30%;

[0064] m 湿 —The weight of soil material that has undergone simple on-site treatment, in tons;

[0065] m 污 —The weight of the wastewater to be treated, in tons;

[0066] The weight of the soil material is calculated according to the following formula, m 湿 =m 干 +m 水

[0067] m 干 —The weight of dry soil excluding moisture in the soil mass, in tons;

[0068] m 水 —The weight of moisture in the soil material, in tons, is calculated using the following formula.

[0069] m 水 =wm 干 =w(m 湿 -m 水 )

[0070]

[0071] w—The percentage of water by weight in dry soil, expressed as a percentage.

[0072] Therefore, equation (1) can be adjusted to

[0073]

[0074] According to the definition of density, the above equation is further expressed as follows:

[0075]

[0076] G 固 —This refers to the density of the curing agent, which, based on numerous experiments, is 2.75 t / m³.

[0077] G 干 —This refers to the density of dry soil. The density of typical clayey soil is 2.70. Considering that this soil may contain a relatively large amount of coarse particles, a density of 2.60 t / m³ is recommended. 3 ;

[0078] G 水 —The density of water, whether in the soil or in the sewage pond 400, is 1.0 t / m³. 3 .

[0079] Substituting all the equations into equation (3)

[0080]

[0081] In the above formula,

[0082] G 水 —The density of water, whether in the soil or in sewage pond 400, is 1.0 t / m³. 3 G 固 —This refers to the density of the curing agent, which, based on numerous experiments, is 2.75 t / m³. 3 ;

[0083] G 干 —This refers to the dry density of soil; the dry density of general soil materials is 2.70 t / m³. 3 Considering that the local material may contain a large amount of coarse soil particles, a value of 2.60 t / m is recommended. 3 ;

[0084] w—The weight of water in the soil material as a percentage of dry soil, expressed as a percentage. The drier the soil material is before mixing with the curing agent, the larger the amount of wastewater to be treated later. The soil material needs to be properly dried before construction, so the moisture content should be controlled between 15-25%.

[0085] Given a solidifying agent ratio, it is generally recommended that the solidifying agent dosage be α = 20-30%. After measuring the weight of 400 tons of wastewater in the wastewater pond on-site, the weight of natural soil required to solidify the wastewater can be calculated.

[0086] For example, taking a general engineering project as an example, let G be... 水 =1.0t / m3; G 固=2.75t / m3; G 干 =2.70t / m3; w = 20%; curing agent ratio α = 30%, then the calculation result is:

[0087] m 湿 =0.685m 污

[0088] That is, for every 1 ton of wastewater treated, 0.685 tons of soil under the above soil indicators are required.

[0089] In this embodiment, in construction step 3), before transporting the solidified material 401 to the periphery of the sewage pond 400 for stacking, measuring instruments are used to determine the periphery of the sewage pond 400 and the landfill area that needs to be filled in the sewage pond 400. Markers are set on the periphery to facilitate subsequent construction.

[0090] In this embodiment, in construction step 3), debris around the sewage pond 400 is removed to form a construction zone around the sewage pond 400. The solidified material 401 is piled on the construction zone to facilitate the subsequent spreading of the material into the sewage pond 400.

[0091] In this embodiment, in construction step 1), the moisture content of the collected engineering waste soil is measured and processed so that the moisture content of the engineering waste soil is between 15% and 25%.

[0092] In construction step 1), when the moisture content of the construction waste soil is greater than 15% to 25%, it will be spread out to dry until the moisture content of the construction waste soil is between 15% and 25%.

[0093] In construction step 1), the construction waste is placed in a crushing hopper for crushing to form crushed material. The crushed material is then placed in a drum screen for sieving to form soil material with a particle size of less than 50mm.

[0094] In construction step 3), after the soil material is placed in the mixer and stirred independently for a set time, the curing material 401 is sprinkled into the mixer until the curing material 401 is mixed with the soil material to form the above-mentioned curing material 401.

[0095] In this embodiment, in construction step 4), the sewage pond 400 is divided into multiple annular areas from the outer periphery to the center. The multiple annular areas are arranged in a nested manner and cover the entire sewage pond 400. In construction step 4), along the sewage pond 400 from the outside to the inside, an excavator is used to spread solidified material 401 into a single annular area. After the solidified material 401 spread into the annular area reacts and combines with the sewage to form a fixed landfill 402, the solidified material 401 is then spread into the next annular area.

[0096] The sewage pond 400 is divided into zones. When the solidified material 401 in one ring zone combines with the sewage to form a solid landfill 402, the landfill 402 can be used as a construction platform to carry out the construction of spreading solidified material 401 in the next ring zone.

[0097] In addition, during the landfilling of the sewage pond 400, the height and flatness of the landfill body 402 are monitored in real time. The solidification material 401 filled into the sewage pond 400 will solidify naturally after a certain period of time. After solidification, the landfill body 402 is properly maintained, such as by covering it with a moisture-retaining film.

[0098] In this embodiment, in construction step 3), the mixer includes a horizontally arranged mixing drum 100, a horizontally arranged mixing chamber 101 in the mixing drum 100, a horizontally arranged mixing shaft 200 in the mixing chamber 101, and a plurality of radial shafts 201 on the outer periphery of the mixing shaft 200. Along the axial direction of the mixing shaft 200, the plurality of radial shafts 201 are staggered.

[0099] The inner end of the radial shaft 201 is connected to the stirring shaft 200. The stirring shaft 200 is provided with a spiral blade 202. The spiral blade 202 is arranged spirally along the circumference of the stirring shaft 200 and is fixedly connected to the outer ends of multiple radial shafts 201 respectively. The spiral blade 202 has adjacent segments located on adjacent radial shafts 201. Multiple through holes are provided on the adjacent segments. The multiple through holes are arranged at intervals along the length direction of the adjacent segments.

[0100] In construction step 3), after the soil material is placed in the mixing chamber 101, the mixing shaft 200 rotates horizontally, driving the rotating blades 202 to rotate synchronously. The rotating blades 202 mix the soil material and the curing agent to form a cured material 401. During the mixing process, the cured material 401 is simultaneously dispersed through the through hole and then mixed.

[0101] During the rotation of the rotating blade 202, the soil material and the curing agent are stirred to form a cured material 401. During the stirring and mixing process, the cured material 401 is passed through the through hole, broken up and then mixed to make the cured material 401 more uniformly mixed.

[0102] In this embodiment, during construction step 3), the inner wall of the mixing chamber 101 is provided with two layers of jet pipes 300. The jet pipes 300 are arranged around the circumference of the mixing chamber 101, and the two layers of jet pipes 300 are arranged at intervals along the height direction of the mixing chamber 101. Each jet pipe 300 has multiple jet micro-holes, which are arranged circumferentially and at intervals along the circumference of the jet pipe 300. The diameter of the jet micro-holes is small, allowing high-pressure gas to be injected into the mixing chamber 101; however, the cured material 401 in the mixing chamber 101 cannot enter the jet pipes 300.

[0103] In construction step 3), during the process of the stirring shaft 200 rotating and mixing the curing material 401, the two layers of jet pipes 300 spray high-pressure gas into the stirring chamber 101, and the jet pressure of the two layers of jet pipes 300 is different and changes alternately. The high-pressure gas sprayed by the two layers of jet pipes 300 performs multi-directional pneumatic stirring of the curing material 401.

[0104] In this way, during the mixing process of the mixing shaft 200 and the curing material 401, the two layers of jet pipes 300 simultaneously perform pneumatic mixing of the curing material 401 and achieve multi-directional mixing, thereby realizing multi-mode and multi-directional mixing of the curing material 401 and improving the mixing uniformity.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for on-site dry mixing and solidification of soil for wastewater pond construction, characterized in that: The construction steps include the following: 1) Collect construction waste soil, crush and screen the construction waste soil in sequence to form the required soil material; 2) Set up storage tanks at the construction site and place the curing agent in the storage tanks. The curing agent includes slag powder, fly ash, waste gypsum, water glass, stone powder slag and furnace slag. 3) According to the design ratio, add the soil material and the curing agent into the mixer and mix them to form a powdered curing material. Transport the curing material to the periphery of the sewage pond for storage. 4) The solidified material is sprinkled into the sewage pond. After the solidified material and sewage are mixed for a set time, the solidified material and sewage react and combine to form a solid landfill. In construction step 1), the engineering waste soil is placed in a crushing bucket for crushing to form crushed material, and the crushed material is placed in a drum screen for tumbling screening to form soil material with a particle size of less than 50mm. In construction step 4), the sewage pond is divided into multiple annular areas from the outer perimeter to the center. The multiple annular areas are arranged in a nested manner and cover the entire sewage pond. In construction step 4), along the direction from the outside to the inside of the sewage pond, an excavator is used to spread the solidified material into a single annular area. After the solidified material spread into the annular area reacts and combines with the sewage to form a fixed landfill, the solidified material is then spread into the next annular area. In construction step 3), the mixer includes a horizontally arranged mixing drum, a horizontally arranged mixing chamber in the mixing drum, a horizontally arranged mixing shaft in the mixing chamber, and multiple radial shafts on the outer periphery of the mixing shaft, which are staggered along the axial direction of the mixing shaft. The inner end of the radial shaft is connected to the stirring shaft, and the stirring shaft is provided with a spiral blade. The spiral blade is arranged spirally along the circumference of the stirring shaft and is respectively connected and fixed to the outer end of multiple radial shafts. The spiral blade has adjacent segments located on adjacent radial shafts, and the adjacent segments are provided with multiple through holes, which are spaced apart along the length direction of the adjacent segments. In construction step 3), after the soil material is placed in the mixing chamber, the mixing shaft rotates horizontally, driving the rotating blades to rotate synchronously. The rotating blades mix the soil material and the curing agent to form a cured material. During the mixing process, the cured material is simultaneously dispersed through the through hole before being mixed again. In construction step 3), the inner wall of the mixing chamber is provided with two layers of jet pipes. The jet pipes are arranged around the circumference of the mixing chamber, and the two layers of jet pipes are arranged at intervals along the height direction of the mixing chamber. The jet pipes are provided with multiple jet micro-holes, and the multiple jet micro-holes are arranged along the circumference of the jet pipes and at intervals along the circumference. In construction step 3), during the process of the stirring shaft rotating and mixing the curing material, the two layers of jet pipes spray high-pressure gas into the stirring chamber, and the jet pressure of the two layers of jet pipes is different and changes alternately. The high-pressure gas sprayed by the two layers of jet pipes performs multi-directional pneumatic stirring of the curing material.

2. The on-site dry-mixing method for solidifying soil and solidifying wastewater ponds as described in claim 1, characterized in that, In construction step 3), before transporting the solidified material to the periphery of the sewage pond for storage, measuring instruments are used to determine the periphery of the sewage pond and the landfill area that needs to be filled in the sewage pond, and markers are set at the periphery.

3. The on-site dry-mixing method for solidifying soil and solidifying wastewater ponds as described in claim 1, characterized in that, In construction step 3), debris around the sewage pond is removed to form a construction zone around the sewage pond, and the solidified material is piled up on the construction zone.

4. The on-site dry-mixing method for solidifying soil and solidifying wastewater ponds as described in claim 1, characterized in that, In construction step 1), the moisture content of the collected engineering waste soil is measured and processed to ensure that the moisture content of the engineering waste soil is between 15% and 25%.

5. The on-site dry-mixing method for solidifying soil and solidifying wastewater ponds as described in claim 4, characterized in that, In construction step 1), when the moisture content of the construction waste soil is greater than 15%~25%, the construction waste soil is spread out to dry until the moisture content of the construction waste soil is between 15%~25%.

6. The on-site dry-mixing method for solidifying soil and solidifying sewage ponds as described in any one of claims 1 to 5, characterized in that, In construction step 3), after the soil material is placed in a mixer and stirred independently for a set time, a solidifying agent is sprinkled into the mixer until the solidifying agent and the soil material are mixed to form the solidifying agent.

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