Sludge solidification materials and dosage calculation methods and their in-situ solidification devices

Abstract

This invention relates to the field of sludge treatment and in-situ solidification technology, specifically to sludge solidification materials and dosage calculation methods, and an in-situ solidification device. The device includes a main control room and a robotic arm. A solidification material mixing chamber is located behind the main control room, and the mixing chamber is equipped with a water tank and a dry solidification material storage chamber. A solidification material transmission pipe is connected to the solidification material outlet. The robotic arm is located at the front end of the main control room, and its end is equipped with a figure-eight shaped pre-solidification material spraying device and a post-solidification material spraying device. Below the pre-solidification material spraying device and the post-solidification material spraying device are a mixing component for mixing the sludge and the solidification material. This invention's mobile in-situ solidification device features a "front and rear spraying + multi-axis deep mixing" design, ensuring uniform mixing of the solidification material and sludge in three-dimensional space. The treatment depth and range are adjustable, and the construction is flexible and efficient. The treated sludge solidified body develops strength more rapidly and uniformly.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment and in-situ solidification technology, specifically to sludge solidification materials and dosage calculation methods, and in-situ solidification devices. Background Technology

[0002] Sludge primarily originates from municipal wastewater treatment, livestock and poultry farming, and some industrial wastewater treatment processes. It is complex in composition, high in water content, and rich in organic matter and various pollutants. Traditional disposal methods, such as sanitary landfill, composting, and incineration, not only consume significant land resources and easily generate leachate and odor pollution, but also suffer from high greenhouse gas emissions, high energy consumption, and low resource utilization rates. With increasingly stringent environmental requirements and dwindling land resources, the harmless, reduced-volume, and resource-oriented treatment of sludge has become an urgent industry need.

[0003] Sludge solidification technology, through the addition of solidification materials, can effectively reduce the moisture content of sludge, stabilize heavy metals and organic pollutants, and improve its engineering mechanical properties, enabling it to meet the requirements of landfill, roadbed filling, or land use. Current solidification treatments mostly rely on centralized off-site disposal, requiring long-distance transportation of sludge to fixed facilities, leading to increased disposal costs and risks of leakage and secondary pollution during transportation. In-situ solidification technology can treat sludge directly at its generation site, significantly reducing transportation needs and environmental hazards, and is particularly suitable for areas with limited space, dispersed distribution, or environmental sensitivity.

[0004] However, existing in-situ sludge solidification technologies still face several bottlenecks: On the one hand, sludge composition fluctuates greatly, is highly viscous, and difficult to dewater, making it difficult for conventional solidification materials to adapt to its complex physicochemical properties, easily leading to problems such as slow strength development and insufficient long-term stability of the solidified body; on the other hand, the amount of solidification material used largely depends on experience, lacking precise calculation methods for dynamic matching with sludge properties, resulting in material waste or substandard solidification effects. Furthermore, existing in-situ solidification devices are mostly based on modifications of general-purpose mixing equipment, exhibiting defects such as poor mixing uniformity, weak adaptability to operating conditions, and low level of intelligence, making it difficult to achieve real-time coordinated control of sludge properties and solidification processes, thus limiting the large-scale promotion and application of this technology.

[0005] Therefore, there is an urgent need to develop a high-efficiency solidification material for sludge characteristics, along with a precise dosage calculation method and an intelligent, integrated in-situ solidification device, in order to improve the efficiency, stability, economy, and environmental friendliness of sludge solidification treatment. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that existing sludge solidification technologies suffer from poor adaptability of solidification materials, dependence on experience in dosage, uneven mixing in in-situ devices, and low level of intelligence.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is to provide an in-situ sludge solidification device, including a main control room and a robotic arm. A solidification material mixing chamber is located behind the main control room. A water tank and a dry solidification material storage chamber are located on the mixing chamber, respectively connected to the mixing chamber. A stirring propeller is located inside the mixing chamber, and a solidification material outlet is located at the bottom. A solidification material transmission pipe is connected to the outlet. The robotic arm is located at the front end of the main control room. At the end of the robotic arm are a pre-solidification material spraying device and a post-solidification material spraying device arranged in a figure-eight shape. The solidification material transmission pipe is connected to the pre-solidification material spraying device and the post-solidification material spraying device. A stirring assembly for mixing sludge and solidification material is connected below the pre-solidification material spraying device and the post-solidification material spraying device.

[0008] Optionally, the stirring assembly includes multiple sets of retractable shafts, each set of retractable shafts being arranged horizontally and evenly. Each retractable shaft set is provided with a horizontal rotating shaft, and multiple stirring blades are evenly arranged on the rotating shaft. A rotating motor is provided at one end of the rotating shaft, and a sealing cover is provided outside the rotating motor.

[0009] Optionally, each set of retractable shafts includes four retractable shafts, which are hinged together to form a quadrilateral retractable shaft set. One end is fixedly connected between the pre-curing material spraying device and the post-curing material spraying device, and the other three ends are hinged together by a rotating shaft.

[0010] Optionally, the robotic arm includes a forearm, a middle arm, and a rear arm. The forearm is connected to a pre-curing material spraying device and a post-curing material spraying device. The middle arm is located between the forearm and the rear arm. The rear arm is connected to the main control room. Control hydraulic rods are provided on the forearm, middle arm, and rear arm.

[0011] Optionally, the water tank is provided with a water inlet and a water outlet at the top and bottom, respectively, and the dry material storage chamber is provided with a material inlet and a material outlet at the top and bottom. The water tank and the dry material storage chamber are connected to the dry material mixing chamber through the water outlet and the material outlet, respectively.

[0012] Optionally, the water outlet pipe of the water tank is equipped with an electromagnetic valve and a flow meter for measuring the water volume, and the discharge pipe is equipped with an electromagnetic valve and a solid meter for measuring the weight of the solidified material.

[0013] Optionally, the pre-curing material spraying device and the post-curing material spraying device include multiple rotary spray nozzles, and a booster pump is provided at the connection between the curing material transmission pipeline and the curing material outlet.

[0014] A method for calculating the dosage of sludge solidification material includes the following steps:

[0015] S1. Obtain the target strength, sludge moisture content, sludge organic matter content, and target curing age of the sludge to be treated; S2. Substitute the parameters obtained in S1 into the intensity prediction model to calculate the amount of sludge solidification material. The intensity prediction model is characterized by the following functional relationship:

[0016] in: To predict intensity, As the baseline parameter, , , To determine the parameters affecting the dosage of curing materials, The moisture content sensitivity coefficient To achieve the target solidification moisture content, , The parameter affecting organic matter content, , The parameters are affected by the maintenance time. To determine the dosage of the curing material, The water content of the sludge. Organic matter content, For the maintenance period, the parameters are... , , , , , , , , These are the model parameters determined through orthogonal experiments and nonlinear regression; S3. Using the target strength as a constraint, calculate the required unit dosage of sludge solidification material from the strength prediction model using a numerical inverse solution method; S4. The main control room calculates the total mass of sludge solidification material required based on the unit dosage of sludge solidification material and the total mass of sludge to be treated.

[0017] A sludge solidification material includes a drying agent, a solidifying agent, a pH adjuster, an organic matter degrading agent, and an odor deodorizer. The drying agent, by weight, comprises 10-20 parts, composed of calcium carbide powder, perlite, bentonite, superabsorbent resin, and polyacrylamide; the solidifying agent, by weight, comprises 25-50 parts, composed of fly ash, coal gangue, slag, desulfurized gypsum, and sulfate-resistant silicate cement; the pH adjuster, by weight, comprises 0-5 parts, composed of sodium hydroxide, calcium hydroxide, calcium oxide, and sodium silicate; the organic matter degrading agent, by weight, comprises 0-3 parts, composed of potassium permanganate, hydrogen peroxide, potassium persulfate, and sodium aluminate; and the odor deodorizer, by weight, comprises 0-2 parts, composed of biochar, ferrous sulfate, and diatomaceous earth.

[0018] In summary, the present invention has at least one of the following beneficial effects: 1. The mobile in-situ solidification device of the present invention has more thorough mixing and more complete functions. It is mobile and portable, and covers all application scenarios. Its intelligent main control system and unique "front and rear spraying + multi-axis deep mixing" design ensure that the solidification material and sludge are mixed evenly in three-dimensional space. The processing depth and range are adjustable, and the construction is flexible and efficient. The solidified sludge after treatment develops strength faster and more evenly.

[0019] 2. The method for calculating the amount of solidifying material in this invention is more accurate and scientific. By establishing a multi-factor coupled strength prediction model, the optimal amount of solidifying material can be directly calculated based on key parameters such as target strength, sludge moisture content and organic matter content. This replaces traditional experience-based judgment, which can fundamentally avoid material waste and insufficient strength, achieve dual control over cost and quality, and save engineering costs.

[0020] 3. The overall solution provided by this invention has stronger adaptability and more significant environmental benefits. Through the synergy of a vehicle-mounted integrated platform, special composite solidification materials and intelligent computing system, it can achieve rapid in-situ stabilization of sludge, greatly reducing transportation distance and the risk of secondary pollution. It is especially suitable for promotion and use in decentralized sludge generation sites and environmentally sensitive areas.

[0021] 4. The high-efficiency solidification material of the present invention, which is composed of inorganic cementing components, organic polymers and porous adsorption materials, can effectively promote sludge dewatering and improve the strength and stability of the solidified body. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the sludge in-situ solidification device of the present invention; Figure 2 This is a top view schematic diagram of the sludge in-situ solidification device of the present invention; In the diagram: 1. Main control room; 2. Water tank; 21. Water inlet; 22. Water outlet pipe; 3. Dry material storage chamber for cured materials; 31. Feeding port; 32. Discharge pipe; 4. Rotary shaft; 5. Mixing blade wheel; 6. Cured material mixing chamber; 7. Cured material discharge port; 8. Cured material transmission pipe; 9. Robotic arm; 91. Forward arm; 92. Middle arm; 93. Rear arm; 10. Telescopic shaft; 11. Pre-cured material spraying device; 12. Post-cured material spraying device; 13. Spray nozzle. Detailed Implementation

[0023] The following combination Figure 1-2 The present invention will be described in further detail below.

[0024] This invention discloses an in-situ sludge solidification device, referring to... Figure 1 and Figure 2The system includes a main control room 1 and a robotic arm 9. Behind the main control room 1 is a solidification material mixing chamber 6. The solidification material mixing chamber 6 has a water tank 2 and a solidification material dry material storage chamber 3, which are connected to the solidification material mixing chamber 6. The solidification material mixing chamber 6 has a mixing propeller and a solidification material outlet 7 at its bottom. An electromagnetic valve is located at the solidification material outlet 7, which is connected to a solidification material transmission pipe 8. The robotic arm 9 is located at the front end of the main control room 1. At the end of the robotic arm 9 are a front solidification material spraying device 11 and a rear solidification material spraying device 12, both arranged in a figure-eight shape. The solidification material transmission pipe 8 is connected to the front and rear solidification material spraying devices 11 and 12. Below the front and rear solidification material spraying devices 11 and 12 are mixing components for mixing sludge and solidification materials.

[0025] Specifically, the bottom of the main control room 1 is equipped with tracks, which can move on complex road surfaces. The main control room 1 is equipped with a control system, which can control the movement of the robotic arm 9, the pouring of water tank 2 and dry material storage chamber 3, the mixing and pouring of material in the mixing chamber 6, the spraying of the pre-curing material spraying device 11 and the post-curing material spraying device 12, and the operation of the mixing components.

[0026] In a further embodiment, the mixing assembly includes multiple sets of telescopic shafts, each set of telescopic shafts being arranged horizontally and uniformly. Each telescopic shaft set is equipped with a horizontal rotating shaft 4, and multiple mixing blade wheels 5 are evenly arranged on the rotating shaft 4. One end of the rotating shaft 4 is equipped with a rotary motor, and the rotary motor is equipped with a sealing cover. Each set of telescopic shafts includes four telescopic shafts 10, and each telescopic shaft 10 is equipped with a telescopic hydraulic rod. The telescopic hydraulic rod controls the extension and retraction of the telescopic shaft 10. The four telescopic shafts 10 are hinged to each other to form a quadrilateral telescopic shaft assembly. One end is fixedly connected between the pre-curing material spraying device 11 and the post-curing material spraying device 12, and the other three ends are hinged together through the rotating shaft 4. The telescopic shaft assembly is used to control the depth of construction.

[0027] In a further embodiment, the robotic arm 9 includes a forearm 91, a middle arm 92, and a rear arm 93. The forearm 91 is connected to the pre-curing material spraying device 11 and the post-curing material spraying device 12. The middle arm 92 is located between the forearm 91 and the rear arm 93. The rear arm 93 is connected to the main control room 1. Control hydraulic rods are provided on the forearm 91, the middle arm 92, and the rear arm 93. The control hydraulic rods can be controlled by the control system in the main control room 1 to adjust the construction range.

[0028] In a further embodiment, the water tank 2 is provided with a water inlet 21 and a water outlet pipe 22 at the top and bottom, respectively. The dry material storage chamber 3 is provided with a feed inlet 31 and a discharge pipe 32 at the top and bottom. The water tank 2 and the dry material storage chamber 3 are connected to the dry material storage chamber 3 through the water outlet pipe 22 and the discharge pipe 32, respectively. The water outlet pipe 22 of the water tank 2 is provided with an electromagnetic valve and a flow meter for measuring the water volume. The discharge pipe 32 is provided with an electromagnetic valve and a solid meter for measuring the weight of the dry material. The pre-drying material spraying device 11 and the post-drying material spraying device 12 include multiple swirl nozzles 13. A booster pump is provided at the connection between the dry material transmission pipe 8 and the dry material discharge port 7.

[0029] Specifically, the solid meter can be a microwave solid flow meter or other device capable of weighing solid powder. The flow meter and solid meter can control the concentration and dosage of the solidified material.

[0030] This invention also discloses a method for calculating the dosage of sludge solidification material, comprising the following steps: S1. Obtain the target strength, sludge moisture content, sludge organic matter content, and target curing age of the sludge to be treated; S2. Substitute the parameters obtained in S1 into the intensity prediction model to calculate the amount of sludge solidification material. The intensity prediction model is characterized by the following functional relationship:

[0031] in: To predict intensity, As the baseline parameter, , , To determine the parameters affecting the dosage of curing materials, The moisture content sensitivity coefficient To achieve the target solidification moisture content, , The parameter affecting organic matter content, , The parameters are affected by the maintenance time. To determine the dosage of the curing material, The water content of the sludge. Organic matter content, For the maintenance period, the parameters are... , , , , , , , , These are the model parameters determined through orthogonal experiments and nonlinear regression; S3. Using the target strength as a constraint, calculate the required unit dosage of sludge solidification material from the strength prediction model using the numerical inverse solution method; S4. The main control room calculates the total mass of sludge solidification material required based on the unit dosage of sludge solidification material and the total mass of sludge to be treated.

[0032] The sludge solidification method of the present invention is as follows: Step 1: Pass the calculated amount of water and sludge solidification material into the solidification material mixing chamber 6, and stir for 5-10 minutes to prepare a solidification material slurry; Step 2: The completed curing material slurry is transported by the curing material transmission pipeline 8 to the pre-curing material spraying device 11 and the post-curing material spraying device 12, and the corresponding rotary spray nozzles 13 are opened according to the control requirements. Step 3: The main control room 1 adjusts the robotic arm 9 to control the construction range according to the on-site engineering needs, and adjusts the telescopic shaft to control the mixing blade wheel 5 to adjust the construction depth; Step 4: Shape the mixture and cure it to the target curing age to obtain a cured body that meets the target strength.

[0033] The sludge solidification materials used in the above-mentioned sludge solidification method include a drying agent, a solidifying agent, a pH adjuster, an organic matter degrading agent, and a deodorizing agent. Specifically, by weight, the drying agent comprises 10-20 parts, made from a mixture of calcium carbide powder, perlite, bentonite, superabsorbent resin, and polyacrylamide; the solidifying agent comprises 25-50 parts, made from a mixture of fly ash, coal gangue, slag, desulfurized gypsum, and sulfate-resistant silicate cement; the pH adjuster comprises 0-5 parts, made from a mixture of sodium hydroxide, calcium hydroxide, calcium oxide, and sodium silicate; the organic matter degrading agent comprises 0-3 parts, made from a mixture of potassium permanganate, hydrogen peroxide, potassium persulfate, and sodium aluminate; and the deodorizing agent comprises 0-2 parts, made from a mixture of biochar, ferrous sulfate, and diatomaceous earth.

[0034] Specifically, the dosage of drying agent, solidifying agent, pH adjuster, organic matter degrading agent, and deodorizing agent in sludge solidification materials is related to the organic matter content, pH value, and moisture content of the organic sludge, as shown in the table below:

[0035] The relationship between the particle size of sludge solidification materials and the strength range of solidified sludge is shown in the table below:

[0036] Example 1 In this embodiment, the sludge has a water content of 78%, an organic matter mass percentage of 5.23%, and a pH of 5.62.

[0037] The required amount of sludge solidification material to achieve the site's required strength (0.42 MPa at 7 days, 1.31 MPa at 28 days) was calculated using an intensity prediction model. =13.57% (by mass of sludge). This solidification material consists of a drying agent, a solidifying agent, a pH adjuster, an organic matter degrading agent, and a deodorizing agent. The percentage of each component by mass of sludge is as follows: The required sludge solidification material is the sludge mass percentage, expressed in parts by weight. The solidification material contains: 3.3% drying agent, 7.8% solidifying agent, 0.85% pH adjuster, 1.3% organic matter degradation agent, and 0.32% deodorizing agent.

[0038] The mass ratio of calcium carbide powder, perlite, bentonite, superabsorbent polymer (SAP), and polyacrylamide in the drying agent is 67:13:17:1.7:1.3 (fineness: 110 μm). The mass ratio of fly ash, coal gangue, slag, desulfurized gypsum, and sulfate-resistant silicate cement in the curing agent is 3:5:62:13:17 (fineness: 296μm). The mass ratio of sodium hydroxide: calcium hydroxide: calcium oxide: sodium silicate in the pH adjuster is 18:30:30:22. The ratio of potassium permanganate: hydrogen peroxide: potassium persulfate: sodium aluminate in the organic matter degrading agent is 13:67:15:5. The ratio of biochar, ferrous sulfate, and diatomaceous earth in the deodorizer is 42:39:19.

[0039] The method for treating sludge-stabilized soil in this embodiment is as follows: Step 1: The calculated amount of water and dry material is injected into the curing material mixing chamber 6 from the water tank 2 and the dry material storage chamber 3. After stirring for 5 to 10 minutes, the curing material slurry is prepared. Step 2: The completed curing material slurry is sent to the pre-curing material spraying device 11 and the post-curing material spraying device 12 through the curing material transmission pipeline 8. The corresponding rotary spray nozzles 13 can be opened according to the control requirements. Step 3: The main control room 1 adjusts the robotic arm 9 to control the construction range according to the on-site engineering needs, and adjusts the telescopic shaft to control the mixing blade wheel 5 to control the construction depth.

[0040] Step 4: Shape the mixture and cure it to the target curing age to obtain a cured body that meets the target strength.

[0041] Example 2 In this embodiment, the sludge has a water content of 108%, an organic matter mass percentage of 9.43%, and a pH of 5.86.

[0042] The required amount of sludge solidification material to achieve the site's required strength (0.84 MPa at 7 days, 1.65 MPa at 28 days) was calculated using an intensity prediction model. =16.46% (by mass of sludge). This solidification material consists of a drying agent, a solidifying agent, a pH adjuster, an organic matter degrading agent, and a deodorizing agent. The percentage of each component by mass of sludge is as follows: The required sludge solidification material is expressed as a percentage of sludge mass, in parts by weight. The solidification material contains: 4.1% drying agent, 8.4% solidifying agent, 0.85% pH adjuster, 2.43% organic matter degradation agent, and 0.68% deodorizing agent.

[0043] The mass ratio of calcium carbide powder, perlite, bentonite, superabsorbent polymer (SAP), and polyacrylamide in the drying agent is 67:13:17:1.7:1.3 (fineness: 110 μm). The mass ratio of fly ash, coal gangue, slag, desulfurized gypsum, and sulfate-resistant silicate cement in the curing agent is 3:5:62:13:17 (fineness: 296μm). The mass ratio of sodium hydroxide: calcium hydroxide: calcium oxide: sodium silicate in the pH adjuster is 18:30:30:22. The ratio of potassium permanganate: hydrogen peroxide: potassium persulfate: sodium aluminate in the organic matter degrading agent is 13:67:15:5. The deodorizer contains biochar, ferrous sulfate, and diatomaceous earth in a ratio of 42:39:19.

[0044] Example 3 In this embodiment, the sludge has a water content of 132%, an organic matter mass percentage of 14.5%, and a pH of 6.32.

[0045] The required amount of sludge solidification material to achieve the site's required strength (0.98 MPa at 7 days, 2.16 MPa at 28 days) was calculated using an intensity prediction model. =19.73% (by mass of sludge). This solidification material consists of a drying agent, a solidifying agent, a pH adjuster, an organic matter degrading agent, and a deodorizing agent. The percentage of each component by mass of sludge is as follows: The required sludge solidification material is in the following proportions by weight: 5.3% drying agent, 8.7% solidifying agent, 1.1% pH adjuster, 3.7% organic matter degradation agent, and 0.93% deodorizing agent.

[0046] The mass ratio of calcium carbide powder, perlite, bentonite, superabsorbent polymer (SAP), and polyacrylamide in the drying agent is 67:13:17:1.7:1.3 (fineness: 110 μm). The mass ratio of fly ash, coal gangue, slag, desulfurized gypsum, and sulfate-resistant silicate cement in the curing agent is 3:5:62:13:17 (fineness: 296μm). The mass ratio of sodium hydroxide: calcium hydroxide: calcium oxide: sodium silicate in the pH adjuster is 18:30:30:22. The ratio of potassium permanganate: hydrogen peroxide: potassium persulfate: sodium aluminate in the organic matter degrading agent is 13:67:15:5. The deodorizer contains biochar, ferrous sulfate, and diatomaceous earth in a ratio of 42:39:19.

[0047] Example 4 In this embodiment, the sludge has a water content of 75%, an organic matter mass percentage of 13.2%, and a pH of 6.71.

[0048] The required amount of sludge solidification material to achieve the site's required strength (0.63 MPa at 7 days, 1.59 MPa at 28 days) was calculated using an intensity prediction model. =16.39% (by mass of sludge). This solidification material consists of a drying agent, a solidifying agent, a pH adjuster, an organic matter degrading agent, and a deodorizing agent. The percentage of each component by mass of sludge is as follows: The required sludge solidification material is expressed as a percentage of sludge mass, in parts by weight. The solidification material contains: 3.2% drying agent, 7.8% solidifying agent, 0.9% pH adjuster, 3.6% organic matter degradation agent, and 0.89% deodorizing agent.

[0049] The mass ratio of calcium carbide powder, perlite, bentonite, superabsorbent polymer (SAP), and polyacrylamide in the drying agent is 67:13:17:1.7:1.3 (fineness: 110 μm). The mass ratio of fly ash, coal gangue, slag, desulfurized gypsum, and sulfate-resistant silicate cement in the curing agent is 3:5:62:13:17 (fineness: 296μm). The mass ratio of sodium hydroxide: calcium hydroxide: calcium oxide: sodium silicate in the pH adjuster is 18:30:30:22. The ratio of potassium permanganate: hydrogen peroxide: potassium persulfate: sodium aluminate in the organic matter degrading agent is 13:67:15:5. The deodorizer contains biochar, ferrous sulfate, and diatomaceous earth in a ratio of 42:39:19.

[0050] Comparison Case 1 The sludge sample was the same as in Example 1. The sludge solidification material was expressed as a percentage of sludge mass, in parts by weight. The solidification material consisted of: 3.2% drying agent and 0.89% deodorizing agent, with a total solidification material content of only 4.09% (far lower than the 13.57% in Example 1). Furthermore, it lacked key components such as solidification agent, pH adjuster, and organic matter degrading agent. The mass ratio of calcium carbide powder, perlite, bentonite, superabsorbent polymer (SAP), and polyacrylamide in the drying agent is 67:13:17:1.7:1.3 (fineness: 110 μm). The deodorizer contains biochar, ferrous sulfate, and diatomaceous earth in a ratio of 42:39:19.

[0051] The same treatment method for sludge solidification soil as in Example 1 was used.

[0052] After standard curing, the measured strength was 0.11 MPa at 7 days and 0.21 MPa at 28 days. Compared with the site requirements (0.42 MPa at 7 days and 1.31 MPa at 28 days), the error rates were -73.8% and -83.97%, respectively. The strength was far below the design requirements and could not meet the engineering needs. This indicates that without curing agents, pH adjusters, and organic matter degrading agents, even with the addition of drying agents and deodorizing agents, the target strength could not be achieved.

[0053] Comparison Case 2 The sludge sample was the same as in Example 2, with a water content of 108%, an organic matter mass percentage of 9.43%, and a pH of 5.86.

[0054] The required sludge solidification material is expressed as a percentage of sludge mass, in parts by weight. The solidification material contains: 8.4% solidifying agent, 0.68% deodorizing agent, and a total solidification material content of only 9.08% (lower than 16.46% in Example 2). It also lacks key components such as drying agent, pH adjuster, and organic matter degrading agent.

[0055] The mass ratio of fly ash, coal gangue, slag, desulfurized gypsum, and sulfate-resistant silicate cement in the curing agent is 3:5:62:13:17 (fineness: 296μm). The deodorizer contains biochar, ferrous sulfate, and diatomaceous earth in a ratio of 42:39:19.

[0056] The same treatment method for sludge solidification soil as in Example 1 was used.

[0057] After standard curing, the measured strength was 0.24 MPa at 7 days and 0.48 MPa at 28 days. Compared with the site requirements (0.84 MPa at 7 days and 1.65 MPa at 28 days), the error rates were -71.43% and -70.91%, respectively, indicating a severe deficiency that fails to meet site requirements. This demonstrates that without drying agents, pH adjusters, and organic matter degrading agents, solidifying agents and deodorizing agents alone cannot effectively solidify the sludge.

[0058] Comparison Case 3 The sludge sample was the same as in Example 3, with a water content of 132%, an organic matter mass percentage of 14.5%, and a pH of 6.32.

[0059] The required sludge solidification material is the sludge mass percentage, expressed in parts by weight. The treatment material contains: 5.3% drying agent, 8.7% solidifying agent, and 0.93% deodorizing agent. The total sludge material content is 14.93% (lower than 19.73% in Example 3), and it lacks pH adjuster and organic matter degrading agent.

[0060] The mass ratio of calcium carbide powder, perlite, bentonite, superabsorbent polymer (SAP), and polyacrylamide in the drying agent is 67:13:17:1.7:1.3 (fineness: 110 μm). The mass ratio of fly ash, coal gangue, slag, desulfurized gypsum, and sulfate-resistant silicate cement in the curing agent is 3:5:62:13:17 (fineness: 296μm). The deodorizer contains biochar, ferrous sulfate, and diatomaceous earth in a ratio of 42:39:19.

[0061] The same treatment method for sludge solidification soil as in Example 1 was used.

[0062] After standard curing, the measured strength was 0.63 MPa at 7 days and 1.45 MPa at 28 days. Compared with the site requirements (0.98 MPa at 7 days and 2.16 MPa at 28 days), the error rates were -35.71% and -32.87%, respectively. The 28-day strength failed to meet the site requirements. This indicates that without pH adjusters and organic matter degrading agents, even with the addition of drying agents, curing agents, and deodorizing agents, the target strength cannot be achieved.

[0063] Comparison Case 4 The sludge sample was the same as in Example 4, with a water content of 75%, an organic matter mass percentage of 13.2%, and a pH of 6.71.

[0064] The required sludge solidification material is expressed as a percentage of sludge mass, in parts by weight. The treatment material contains: 3.2% drying agent, 7.8% solidifying agent, 3.6% organic matter degradation agent, and 0.89% deodorizing agent. The total sludge solidification material content is 15.49% (lower than 16.39% in Example 4), and a pH adjuster is missing.

[0065] The mass ratio of calcium carbide powder, perlite, bentonite, superabsorbent polymer (SAP), and polyacrylamide in the drying agent is 67:13:17:1.7:1.3 (fineness: 110 μm). The mass ratio of fly ash, coal gangue, slag, desulfurized gypsum, and sulfate-resistant silicate cement in the curing agent is 3:5:62:13:17 (fineness: 296μm). The ratio of potassium permanganate: hydrogen peroxide: potassium persulfate: sodium aluminate in the organic matter degrading agent is 13:67:15:5. The deodorizer contains biochar, ferrous sulfate, and diatomaceous earth in a ratio of 42:39:19.

[0066] The same treatment method for sludge solidification soil as in Example 1 was used.

[0067] After standard curing, the measured strength was 0.48 MPa at 7 days and 1.23 MPa at 28 days. Compared with the site requirements (0.63 MPa at 7 days and 1.59 MPa at 28 days), the error rates were -23.81% and -22.64%, respectively. The 7-day strength was still lower than the site requirements. This indicates that the curing effect was affected by the lack of a pH adjuster, and the target strength could not be fully achieved.

[0068] The strength and accuracy of the various embodiments and comparative projects at different curing ages are shown in the table below:

[0069] As can be seen from the table, the actual engineering strength of solidification materials using only the dryer, solidifier, pH adjuster, organic matter degrader, and deodorizer components is far less than that of the solidification materials used in this application, and the accuracy of the strength required by the calculated solidification material dosage is also very large.

[0070] This invention provides a dynamic calculation method for the dosage of solidification material based on sludge moisture content, organic matter content, and target strength parameters, enabling precise dosing. A matching mobile in-situ solidification device integrates sludge conveying, online monitoring, intelligent proportioning, and efficient mixing functions, automatically adjusting the solidification material dosage and mixing process according to real-time sludge properties. This invention achieves efficient and rapid in-situ solidification of sludge, offering advantages such as good solidification effect, precise dosage, flexible construction, high degree of intelligence, and environmental friendliness.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A sludge in-situ solidification device, characterized in that, The system includes a main control room (1) and a robotic arm (9). The main control room (1) is located behind a solidification material mixing chamber (6). The solidification material mixing chamber (6) is equipped with a water tank (2) and a solidification material dry storage chamber (3). The water tank (2) and the solidification material dry storage chamber (3) are respectively connected to the solidification material mixing chamber (6). The solidification material mixing chamber (6) is equipped with a stirring propeller and a solidification material outlet (7) at the bottom. The solidification material outlet (7) is connected to a solidification material transmission pipe (8). The robotic arm (9) is located at the front end of the main control room (1). The end of the robotic arm (9) is equipped with a front solidification material spraying device (11) and a rear solidification material spraying device (12) in the shape of an "eight". The solidification material transmission pipe (8) is connected to the front solidification material spraying device (11) and the rear solidification material spraying device (12). The front solidification material spraying device (11) and the rear solidification material spraying device (12) are connected to a stirring component for stirring sludge and solidification material below them. The stirring assembly includes multiple sets of retractable shafts, each set of retractable shafts is arranged horizontally and evenly, each set of retractable shafts is provided with a horizontal rotating shaft (4), each rotating shaft (4) is provided with multiple stirring blade wheels (5) evenly, one end of the rotating shaft (4) is provided with a rotating motor, and the rotating motor is provided with a sealing cover. Each set of retractable shafts includes four retractable shafts (10). The four retractable shafts (10) are hinged together to form a quadrilateral retractable shaft set. One end is fixedly connected between the pre-curing material spraying device (11) and the post-curing material spraying device (12), and the other three ends are hinged together by a rotating shaft (4). The water tank (2) is provided with a water inlet (21) and a water outlet pipe (22) at the top and bottom respectively. The dry material storage chamber (3) of the solidified material is provided with a material inlet (31) and a material outlet pipe (32) at the top and bottom respectively. The water tank (2) and the dry material storage chamber (3) of the solidified material are connected to the mixing chamber (6) of the solidified material through the water outlet pipe (22) and the material outlet pipe (32) respectively.

2. The sludge in-situ solidification device according to claim 1, characterized in that, The robotic arm (9) includes a forearm (91), a middle arm (92) and a rear arm (93). The forearm (91) is connected to the pre-curing material spraying device (11) and the post-curing material spraying device (12). The middle arm (92) is located between the forearm (91) and the rear arm (93). The rear arm (93) is connected to the main control room (1). Control hydraulic rods are provided on the forearm (91), the middle arm (92) and the rear arm (93).

3. The sludge in-situ solidification device according to claim 1, characterized in that, The water outlet pipe (22) of the water tank (2) is equipped with an electromagnetic valve and a flow meter for measuring water volume, and the discharge pipe (32) is equipped with an electromagnetic valve and a solid meter for measuring the weight of the solidified material.

4. The sludge in-situ solidification device according to claim 3, characterized in that, The pre-curing material spraying device (11) and the post-curing material spraying device (12) include multiple rotary nozzles (13), and a booster pump is provided at the connection between the curing material transmission pipeline (8) and the curing material outlet (7).

5. A method for calculating the dosage of sludge solidification material, using the sludge in-situ solidification device as described in claim 1, characterized in that... Includes the following steps: S1. Obtain the target strength, sludge moisture content, sludge organic matter content, and target curing age of the sludge to be treated; S2. Substitute the parameters obtained in S1 into the intensity prediction model to calculate the amount of sludge solidification material. The intensity prediction model is characterized by the following functional relationship: in: To predict intensity, As the baseline parameter, , , To determine the parameters affecting the dosage of curing materials, The moisture content sensitivity coefficient To achieve the target solidification moisture content, , The parameter affecting organic matter content, , The parameters are affected by the maintenance time. To determine the dosage of the curing material, The water content of the sludge. Organic matter content, For the maintenance period, the parameters are... , , , , , , , , These are the model parameters determined through orthogonal experiments and nonlinear regression; S3. Using the target strength as a constraint, calculate the required unit dosage of sludge solidification material from the strength prediction model using a numerical inverse solution method; S4. The main control room (1) calculates the total mass of sludge solidification material required based on the unit dosage of sludge solidification material and the total mass of sludge to be treated.

6. The sludge solidification material according to the method for calculating the dosage of sludge solidification material as described in claim 5, characterized in that, It includes a drying agent, a curing agent, a pH adjuster, an organic matter degrading agent, and an odor remover. By weight, the drying agent is 10-20 parts, made from a mixture of calcium carbide powder, perlite, bentonite, superabsorbent resin, and polyacrylamide; the curing agent is 25-50 parts, made from a mixture of fly ash, coal gangue, slag, desulfurized gypsum, and sulfate-resistant silicate cement; the pH adjuster is 0-5 parts, made from a mixture of sodium hydroxide, calcium hydroxide, calcium oxide, and sodium silicate; the organic matter degrading agent is 0-3 parts, made from a mixture of potassium permanganate, hydrogen peroxide, potassium persulfate, and sodium aluminate; and the odor remover is 0-2 parts, made from a mixture of biochar, ferrous sulfate, and diatomaceous earth.

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