River bottom sludge baking-free brick preparation system and method based on in-situ microbial solidification technology

Abstract

The invention discloses a river bottom sludge baking-free brick preparation system and method based on an in-situ microbial solidification technology. Comprising a river bottom sludge mining device for mining river bottom sludge, a sludge collecting device for collecting the sludge mined by the river bottom sludge mining device, a mixing device for mixing the sludge and a chemical reagent, and a forming mold for applying pressure to the sludge and forming a green brick with a preset shape and strength, the curing chamber is used for curing the formed green bricks; and the drying chamber is used for drying the cured green bricks. According to the method, microorganisms existing in the river bottom sludge are used for biological solidification, the river bottom sludge is converted into the building material, high-temperature firing is not needed, and therefore energy consumption and production cost are reduced, meanwhile, environmental pollution in the traditional firing process is avoided, and the method not only can treat a large amount of river bottom sludge, but also can treat a large amount of sludge. The environmental protection problem of a traditional sludge treatment method is solved, water body pollution can be improved, and the dual effects of sludge recycling and environmental treatment are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of river sludge treatment, and in particular to a system and method for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology. Background Art

[0002] With the acceleration of urbanization and industrialization, the problem of river sludge has become an important problem in the field of environmental protection. As an important part of the urban water system, the water quality and ecological environment of urban rivers and lakes directly affect the sustainable development of the city and the quality of life of residents. However, with the continuous increase of human activities, a large amount of sludge has accumulated in the river. This sludge not only contains a large amount of organic matter, heavy metals and other pollutants, but also long-term backlog will lead to water quality deterioration, affect the self-purification ability of the water body, and further threaten the health of the life system in the water environment.

[0003] Traditional methods for treating river sludge mainly include landfill and incineration. The landfill method is to transport the sludge to a designated site for stacking and landfilling. Although this method is simple to operate, it has many disadvantages. First, the sludge contains a large amount of water and organic matter, which is easy to produce leachate after landfill. If these leachates are not properly handled, they will pollute the soil and groundwater. Secondly, the landfill site occupies a large area, and with the increase in the amount of landfill, the occupation of land resources is becoming increasingly tense. In addition, the landfill method may also cause harmful substances in the sludge to accumulate in the soil, causing long-term harm to the ecosystem.

[0004] The incineration method is to remove organic matter and water from sludge through high-temperature incineration to achieve the purpose of volume reduction, harmlessness and resource utilization. However, a large amount of harmful gases and smoke will be generated during the incineration process, such as sulfur dioxide, nitrogen oxides and heavy metals, which will cause serious pollution to the atmospheric environment if not handled properly. At the same time, the investment and operation costs of incineration equipment are high, and the slag and fly ash generated during the incineration process still need to be subsequently treated, which increases the cost and complexity of treatment.

[0005] In addition to landfill and incineration, traditional river sludge treatment methods include composting and chemical treatment. Composting is the process of decomposing organic matter in sludge into stable humus through the action of microorganisms, but this method has a long treatment cycle and has high requirements for the water content and organic matter content of the sludge. Chemical treatment is to change the properties of sludge by adding chemical reagents, making it easier to separate and treat, but this method is prone to introduce new pollutants and has high treatment costs.

[0006] In summary, the traditional river sludge treatment method has many disadvantages. Not only is the construction cost expensive, but it may also cause secondary pollution and new damage to the environment. Therefore, it is urgent to develop a more efficient and environmentally friendly river sludge treatment technology to solve the current sludge treatment problem. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a system and method for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology.

[0008] The technical solution of the present invention to solve the above technical problems is as follows: a system for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology, comprising:

[0009] A riverbed sludge mining device is used to mine riverbed sludge;

[0010] A sludge collecting device, which is connected to the riverbed sludge mining device and is used to collect the sludge mined by the riverbed sludge mining device;

[0011] A mixing device, the mixing device is connected to the sludge collecting device through a transmission belt, the sludge in the sludge collecting device is transported to the mixing device through the transmission belt, and the sludge is mixed with the chemical reagent in the mixing device;

[0012] A forming mold, the forming mold is connected to the mixing device, and pressure is applied to the sludge through the forming mold to form a brick with a predetermined shape and strength;

[0013] A curing chamber, which is connected to the forming mold and is used to cure the formed bricks;

[0014] The drying chamber is connected with the curing chamber, and the cured bricks are dried in the drying chamber to obtain finished bricks.

[0015] Furthermore, the riverbed sludge mining device includes a suction port, a power unit connected to the suction port, and a storage unit connected to the power unit. The sludge is pumped from the suction port to the storage unit through the power unit, and the storage unit is connected to the sludge collecting device.

[0016] Furthermore, the mixing device includes a mixing chamber, two liquid inlets respectively opened on the mixing chamber, and a stirring unit located in the mixing chamber. The mixing chamber is connected to the storage unit of the riverbed sludge mining device, and the liquid inlets are respectively used to inject microbial excitation liquid and reaction liquid.

[0017] Furthermore, the forming mold includes a bottom plate, a mold body arranged on the bottom plate, and a compression unit for compressing the sludge into the mold body.

[0018] Furthermore, an electric heating tube for controlling the temperature of the curing chamber is provided at the bottom of the curing chamber, and a spray port for spraying the reaction liquid is provided at the top of the curing chamber.

[0019] Furthermore, a heating element is provided in the drying chamber to accelerate the evaporation of water in the bricks.

[0020] The present invention also provides a method for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology, which is prepared using a preparation system and comprises the following steps:

[0021] S1: Using river bottom mining equipment to mine river bottom sludge;

[0022] S2: Prepare a microbial stimulating solution according to 0.4 times the weight of the riverbed sludge;

[0023] S3: Prepare a reaction solution according to 0.25 times the weight of river bottom sludge;

[0024] S4: transporting the riverbed sludge to a mixing device, and injecting the prepared microorganism stimulating liquid and reaction liquid into the mixing device, fully mixing the microorganism stimulating liquid, reaction liquid and riverbed sludge through a stirring unit, molding the uniformly mixed sludge through a molding mold, applying a certain pressure to the molded mud material to form a brick with a predetermined shape and strength, placing the molded brick in a curing chamber, controlling the temperature of the curing chamber to 25°C, and spraying 12 reaction liquid 6 times;

[0025] S5: The solidified bricks are moved to a drying room for drying to accelerate the evaporation of water and obtain finished bricks that have been dried and cured.

[0026] Furthermore, the microbial stimulating liquid uses water as solvent, beef extract content is 25 g / L, urea content is 10 g / L, nickel chloride content is 0.1 g / L, ammonium chloride content is 10 g / L, and its pH is adjusted to 9.1 using sodium hydroxide.

[0027] Furthermore, the reaction solution contained water as solvent, 50 g / L urea, 111 g / L calcium chloride and 0.36 g / L soybean extract.

[0028] The present invention has the following beneficial effects: the system and method for preparing riverbed sludge unfired bricks based on in-situ microbial solidification technology provided by the present invention converts riverbed sludge into building materials through biological solidification by microorganisms present in riverbed sludge without high-temperature firing, thereby greatly reducing energy consumption and production costs, and avoiding environmental pollution in the traditional firing process. The method can not only effectively treat a large amount of riverbed sludge and solve the environmental problems of traditional sludge treatment methods, but also improve water pollution, achieving the dual effects of sludge resource utilization and environmental governance.

[0029] In addition, the activity of microorganisms in riverbed sludge is increased by microbial stimulating liquid, which reduces the cultivation and transportation of chemical substances such as bacterial liquid, and the generated calcium carbonate is an inorganic metal salt widely present in nature, which has a broad market application prospect. Overall, this technology not only improves the utilization rate of riverbed sludge and improves the physical properties of riverbed sludge, but also has the advantages of environmental protection, low carbon and sustainable development, which meets the needs of modern green buildings and resource recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the riverbed sludge mining device in the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the mixing device in the present invention;

[0033] Figure 4 It is a schematic diagram of the molding die structure in the present invention;

[0034] Figure 5 It is a schematic diagram of the curing chamber structure in the present invention;

[0035] Figure 6 It is a schematic diagram of the drying chamber structure in the present invention. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] like Figures 1 to 6 As shown, a system for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology includes a riverbed sludge mining device 1, a sludge collecting device 2, a mixing device 4, a forming mold 8, a curing chamber 9 and a drying chamber 10. The riverbed sludge mining device 1 is used to mine riverbed sludge; the sludge collecting device 2 is connected to the riverbed sludge mining device 1, and is used to collect the sludge mined by the riverbed sludge mining device 1; the mixing device 4 is connected to the sludge collecting device 2 through a transmission belt 3, and the sludge in the sludge collecting device 2 is transported to the mixing device 4 through the transmission belt 3, and the sludge is mixed with chemical reagents in the mixing device 4; the forming mold 8 is connected to the mixing device 4, and pressure is applied to the sludge through the forming mold 8 to form a brick blank with a predetermined shape and strength; the curing chamber 9 is connected to the forming mold 8, and the formed brick blank is cured through the curing chamber 9; the drying chamber 10 is connected to the curing chamber 9, and the cured brick blank is dried through the drying chamber 10 to obtain a finished brick.

[0038] like Figure 2As shown, the riverbed sludge mining device 1 includes a suction port 2-1, a power unit 2-2 connected to the suction port 2-1, and a storage unit 2-3 connected to the power unit 2-2. The sludge is pumped from the suction port 2-1 to the storage unit 2-3 through the power unit 2-2, and the storage unit 2-3 is connected to the sludge collection device 2. The suction port 2-1 is the front end of the sludge mining device. The suction port 2-1 is responsible for directly contacting the riverbed sludge and incorporating it into the mining device. The power unit 2-2 provides the necessary power for the sludge mining device to drive the suction port 2-1 and the sludge conveying system. The storage unit 2-3 temporarily stores the sludge pumped by the power unit 2-2 for subsequent processing and transportation. When the device is started, the power unit 2-2 starts to work and drives the suction port 2-1 to collect sludge. The suction port 2-1 uses negative pressure or mechanical force to adsorb the riverbed sludge and incorporate it into the device. The collected sludge is transported to the storage unit 2-3 by the drive of the power unit 2-2. This process may involve the coordinated work of sludge conveying pipes, valves and other components. The sludge is temporarily stored in the storage unit 2-3, waiting for subsequent processing and transportation. The design of the storage unit 2-3 should ensure that the sludge does not leak or overflow, and is convenient for connection and transportation with the sludge collection device 2. When the sludge in the storage unit 2-3 reaches a certain amount, the sludge can be transported to the collection device for subsequent processing by connecting with the sludge collection device 2.

[0039] like Figure 3As shown, the mixing device 4 includes a mixing chamber, two liquid inlets 4-1 respectively opened on the mixing chamber, and a stirring unit 5 located in the mixing chamber. The mixing chamber is connected to the storage unit 2-3 of the riverbed sludge mining device 1, and the liquid inlet 4-1 is used to inject the microorganism stimulating liquid 6 and the reaction liquid 7 respectively. The mixing chamber is the core part of the mixing device 4. The mixing chamber is responsible for accommodating the sludge, the microorganism stimulating liquid 6 and the reaction liquid 7, and providing a suitable environment to promote their mixing and reaction. The liquid inlet 4-1 is used to inject the microorganism stimulating liquid 6 and the reaction liquid 7 respectively to improve the physical and chemical properties of the sludge and promote the decomposition and solidification of organic matter in the sludge. The stirring unit 5 stirs the sludge and the additive liquid in the mixing chamber by mechanical force or fluid force to promote their mixing and reaction. The sludge is input into the mixing chamber from the storage unit 2-3 of the riverbed sludge mining device 1 through an appropriate conveying method such as a pipeline, a pump, etc. The microorganism stimulating liquid 6 and the reaction liquid 7 are injected into the mixing chamber through the two liquid inlets 4-1 respectively. These additives can improve the physical and chemical properties of the sludge and promote the decomposition and solidification of organic matter in the sludge. Start the stirring unit 5 to stir the sludge and additives in the mixing chamber. During the stirring process, the sludge and additives collide and rub violently under the action of the stirring unit 5, thereby achieving full mixing. After a period of stirring and mixing, the mixed liquid reaches a predetermined uniformity and reaction degree. At this time, the mixed liquid can be output to a subsequent processing unit through an appropriate output method such as a pipeline, a pump, etc.

[0040] like Figure 4 As shown, the forming mold 8 includes a bottom plate 8-3, a mold body 8-1 arranged on the bottom plate 8-3, and a compression unit 8-2 for compressing the sludge into the mold body 8-1. The bottom plate 8-3 is the bottom support structure of the mold, which bears the weight of the mold body 8-1 and the pressure generated during the sludge compression process. The mold body 8-1 is the core part of the forming mold 8, which defines the shape and size of the brick blank formed after the sludge is compressed. The mold body 8-1 is usually composed of upper and lower templates, a mold core and other components, which together constitute a closed cavity, and the sludge is compressed and formed in this cavity. The compression unit 8-2 is the power component in the forming mold 8, which is responsible for compressing the sludge into the mold body 8-1 to form a brick blank of a predetermined shape and strength. The compression unit 8-2 is usually composed of one or more hydraulic cylinders or pneumatic cylinders, which generate pressure through the movement of pistons.

[0041] like Figure 5As shown, at the bottom of the curing chamber 9, there is an electric heating tube 9-1 for controlling the temperature of the curing chamber 9, and at the top of the curing chamber 9, there is a spray port 9-2 for spraying the reaction liquid 7. The electric heating tube 9-1 is a key component in the curing chamber 9, and its main function is to control and maintain the temperature in the curing chamber 9. By heating, the electric heating tube 9-1 can raise the temperature in the curing chamber 9 to the required level to ensure that the sludge bricks undergo a curing reaction under suitable temperature conditions. The spray port 9-2 is responsible for spraying the reaction liquid 7 in the curing chamber 9. These reaction liquids 7 may contain chemical substances that promote the decomposition and curing of organic matter in the sludge, which helps to accelerate the curing process of the sludge bricks. Through spraying, the reaction liquid 7 can be evenly covered on the surface of the sludge bricks to ensure the uniformity and consistency of the curing reaction.

[0042] like Figure 6 As shown, a heating element 10 - 1 is provided in the drying chamber 10 , and the heating element 10 - 1 is used to accelerate the evaporation of water in the bricks.

[0043] In addition, the present invention also provides a method for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology, which is prepared using a preparation system.

[0044] Example 1

[0045] In this example, a method for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology was carried out at the bottom of the Jialing River. The implementation steps are as follows:

[0046] S1: Using riverbed mining device 1 to mine the sludge at the bottom of Jialing River

[0047] S2: Prepare microbial stimulating liquid 6 according to 0.4 times the weight of riverbed sludge. The microbial stimulating liquid 6 uses water as solvent, beef extract content is 25g / L, urea content range is 10g / L, nickel chloride content range is 0.1g / L and ammonium chloride content range is 10g / L; use sodium hydroxide to adjust its pH to 9.1.

[0048] S3: Reaction solution 7 is prepared according to 0.25 times the weight of the riverbed sludge. The reaction solution 7 uses water as a solvent, and each liter of the reaction solution 7 contains 50g of urea, 111g of calcium chloride and 0.36g of soybean extract.

[0049] S4: The riverbed sludge of Jialing River is transported to the mixing tank 4, the microorganism stimulating liquid 6, the reaction liquid 7 and the riverbed sludge are fully mixed by the stirring device 5, the mixed sludge is molded by the molding mold 8, and a certain pressure is applied to the molded mud material to form a brick with a predetermined shape and strength. The molded brick 11 is placed in the curing chamber 9, the temperature of the curing chamber 9 is controlled to be 25°C, and the reaction liquid is sprayed 12 6 times.

[0050] S5: The solidified green bricks are moved to the drying chamber 10 for drying to accelerate the evaporation of water and obtain finished bricks that have been dried and cured.

[0051] Example 2

[0052] In this example, a method for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology was carried out in the laboratory, and the implementation steps are as follows:

[0053] S1: Collect the sludge mined from the river bottom and store it in a refrigerator at -4℃.

[0054] S2: Prepare microbial stimulating liquid 6 according to 0.55 times the weight of riverbed sludge. The microbial stimulating liquid 6 uses water as solvent, beef extract content is 20g / L, urea content range is 8g / L, nickel chloride content range is 0.12g / L and ammonium chloride content range is 12g / L; use sodium hydroxide to adjust its pH to 9.2.

[0055] S3: Reaction solution 7 is prepared according to 0.35 times the weight of the riverbed sludge. The reaction solution 7 uses water as a solvent, and each liter of the reaction solution 7 contains 70g of urea, 85g of calcium chloride and 0.25g of soybean extract.

[0056] S4: The riverbed sludge is fully mixed with the microorganism stimulating liquid 6, the reaction liquid 7 and the riverbed sludge through a stirring device, and the mixed sludge is molded to form a brick with a predetermined shape and strength. The molded brick is placed in a curing chamber 9, the temperature of the curing chamber 9 is controlled to be 20° C., and the reaction liquid 12 is sprayed 9 times.

[0057] S5: The solidified green bricks are moved to the drying chamber 10 for drying to accelerate the evaporation of water and obtain finished bricks that have been dried and cured.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology, characterized in that: include: A riverbed sludge mining device (1) is used to mine riverbed sludge; A sludge collecting device (2), the sludge collecting device (2) being connected to the riverbed sludge mining device (1) and being used to collect sludge mined by the riverbed sludge mining device (1); A mixing device (4), wherein the mixing device (4) is connected to the sludge collecting device (2) via a transmission belt (3), and the sludge in the sludge collecting device (2) is transported to the mixing device (4) via the transmission belt (3), and the sludge is mixed with a chemical reagent in the mixing device (4); A forming mold (8), the forming mold (8) being connected to the mixing device (4), and applying pressure to the sludge through the forming mold (8) to form a brick with a predetermined shape and strength; A curing chamber (9), the curing chamber (9) being connected to the forming mold (8), and performing a curing operation on the formed brick blank through the curing chamber (9); A drying chamber (10), wherein the drying chamber (10) is connected to the curing chamber (9), and the cured bricks are dried in the drying chamber (10) to obtain finished bricks.

2. The system for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology according to claim 1 is characterized in that: The riverbed sludge mining device (1) comprises a suction port (2-1), a power unit (2-2) connected to the suction port (2-1), and a storage unit (2-3) connected to the power unit (2-2); the sludge is pumped from the suction port (2-1) to the storage unit (2-3) via the power unit (2-2); and the storage unit (2-3) is connected to the sludge collecting device (2).

3. The system for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology according to claim 2 is characterized in that: The mixing device (4) comprises a mixing chamber, two liquid inlets (4-1) respectively opened on the mixing chamber, and a stirring unit (5) located in the mixing chamber. The mixing chamber is connected to the storage unit (2-3) of the riverbed sludge mining device (1). The liquid inlets (4-1) are respectively used to inject microorganism stimulating liquid (6) and reaction liquid (7).

4. The system for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology according to claim 1 is characterized in that: The forming mold (8) comprises a bottom plate (8-3), a mold body (8-1) arranged on the bottom plate (8-3), and a compression unit (8-2) used for compressing sludge into the mold body (8-1).

5. The system for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology according to claim 1 is characterized in that: The bottom of the curing chamber (9) is provided with an electric heating pipe (9-1) for controlling the temperature of the curing chamber (9), and the top of the curing chamber (9) is provided with a spray port (9-2) for spraying the reaction liquid (7).

6. The system for preparing riverbed sludge unburned bricks based on in-situ microbial solidification technology according to claim 1 is characterized in that: A heating element (10-1) is arranged in the drying chamber (10), and the evaporation of water in the brick blank is accelerated by the heating element (10-1).

7. A method for preparing unburned river sludge bricks based on in-situ microbial solidification technology, characterized in that: The preparation is carried out using the preparation system according to any one of claims 1 to 6, comprising the following steps: S1: Using river bottom mining equipment to mine river bottom sludge; S2: preparing a microbial stimulating solution (6) at a weight of 0.2-0.55 times the weight of the riverbed sludge; S3: preparing a reaction solution (7) according to 0.15-0.35 times the weight of the riverbed sludge; S4: transporting the riverbed sludge to the mixing device (4), injecting the prepared microorganism stimulating liquid (6) and the reaction liquid (7) into the mixing device (4), fully mixing the microorganism stimulating liquid (6), the reaction liquid (7) and the riverbed sludge through the stirring unit (5), molding the uniformly mixed sludge through a molding mold (8), applying a certain pressure to the molded mud material to form a brick with a predetermined shape and strength, placing the molded brick in a curing chamber (9), controlling the temperature of the curing chamber (9) to 25°C, and spraying 12 reaction liquid 6 times; S5: The solidified bricks are moved to a drying chamber (10) for drying to accelerate the evaporation of water and obtain finished bricks that have been dried and cured.

8. The method for preparing unburned riverbed sludge bricks based on in-situ microbial solidification technology according to claim 7, characterized in that: The microorganism stimulating liquid (6) uses water as solvent, beef extract content of 15g / L-25g / L, urea content of 4g / L-10g / L, nickel chloride content of 0.01g / L-0.12g / L, ammonium chloride content of 5g / L-12g / L, and uses sodium hydroxide to adjust its pH to 9.05-9.

30.

9. The method for preparing unburned river sludge bricks based on in-situ microbial solidification technology according to claim 7, characterized in that: The reaction solution (7) contains water as solvent, 35 g / L-70 g / L urea, 40 g / L-111 g / L calcium chloride and 0.12 g / L-0.36 g / L soybean extract.

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