A method for treating dredged sludge suitable for multi-source clearing material

Abstract

The application relates to the technical field of environmental protection engineering and dredging sludge treatment, and particularly relates to a dredging sludge treatment method suitable for multiple-source dredging materials, which comprises the following steps: firstly, different sources of dredging materials are divided into target dry dredging sludge materials and target wet dredging sludge materials; the target dry dredging sludge materials are treated to obtain sand mixture and large garbage; the target wet dredging sludge materials and the sand mixture are treated to obtain clean sand, residue stone mixture and first sewage; secondly, the residue stone mixture is subjected to residue stone separation treatment to obtain stone blocks, light garbage and second sewage; thirdly, the first sewage and the second sewage are subjected to tail water treatment to obtain grid residue and mud cake; finally, the large garbage, the light garbage and the grid residue are sequentially subjected to drying treatment and crushing treatment to be made into combustible renewable fuel; and the clean sand and the mud cake are treated by a brick making device to obtain green bricks; the application has the effect of solving the problem that traditional ditch sludge treatment methods are difficult to treat bottom sludge with low water content.

Description

Technical Field

[0001] This application relates to the technical fields of environmental engineering and dredging sludge treatment, and in particular to a method for treating dredging sludge applicable to multi-source dredging materials. Background Technology

[0002] With the continuous development of urban construction, in order to ensure the normal operation of water facilities such as rivers, lakes, and reservoirs, as well as waterworks such as sewage pipe networks, rainwater pipe networks, pumping stations, and regulating reservoirs, regular or emergency dredging is inevitably required, generating a large amount of solid waste during the dredging process. Within the industry, sludge generated from processes such as sewer cleaning and dredging of rivers and near-shore waterways is defined as ditch sludge and river and lake bottom sediment. Traditional treatment methods for ditch sludge often involve simple screening and washing, controlling the washing time, water volume, and screen mesh size to obtain sand particles of different sizes. Light organic matter and large inorganic matter in the dredging sludge are directly transported off-site for disposal without separation, often through incineration or landfill. For bottom sediment dredged during river and near-shore waterway dredging, thickening tanks are often built on the shore or mobile dewatering devices are used for dewatering and solidification before off-site disposal, often by sea dumping or as spoil.

[0003] While existing treatment methods on the market can treat and utilize sludge from drainage ditches to a certain extent, they mainly focus on screening and washing sand particles. At the same time, traditional treatment methods have high requirements for the moisture content of the received materials and can only process materials transported by vacuum trucks. They are not suitable for materials that have been manually cleaned and transported by box trucks or hooklift trucks. Therefore, some drainage sludge treatment stations only accept materials transported by vacuum trucks, and existing drainage sludge treatment stations cannot meet the needs of riverbed sediment treatment. Summary of the Invention

[0004] To address the problem that traditional ditch sludge treatment methods are insufficient for treating bottom sediment with low water content, this application provides a dredging sludge treatment method suitable for multi-source dredging materials.

[0005] This application provides a method for treating dredged sludge suitable for multi-source dredging, which adopts the following technical solution: A method for treating dredged sludge applicable to multi-source dredging materials is applied to a dredged sludge treatment system, the system comprising a dry dredged sludge treatment line, a wet dredged sludge treatment line, fuel manufacturing equipment, and brick-making equipment. The method includes: Based on moisture content, dredging materials from different sources are classified into target dry dredging sludge materials and target wet dredging sludge materials. The target dry sludge material is processed through the dry sludge treatment line to obtain a sand mixture and bulky waste. The target wet sludge material and the sand mixture are processed by the wet sludge treatment line to obtain a clean sand, slag mixture and first wastewater. The slag-stone mixture is subjected to slag-stone separation treatment to obtain stones, lightweight waste, and second sewage. The stones are transported to the dry sludge treatment line for dry sludge treatment. After the first wastewater and the second wastewater are treated with tailwater, screenings and sludge cake are obtained. The bulky waste, the lightweight waste, and the screenings are sequentially dried and crushed to produce combustible renewable fuel. The clean sand and the mud cake are processed by the brick-making equipment to obtain brick blanks.

[0006] Optionally, the process of treating the target dry sludge material through the dry sludge treatment line to obtain a sand mixture and bulky waste includes: The target dry sludge material is sorted and pre-screened to determine the particle size of each component in the target dry sludge material. Based on the particle size of each component in the target dry sludge material, the target dry sludge material is divided into large waste and small waste. The small pieces of waste are crushed to obtain the sand mixture.

[0007] Optionally, the process of treating the target wet sludge material and the sand mixture through the wet sludge treatment line to obtain a clean sand, slag mixture, and first wastewater includes: The target wet sludge material and the sand mixture are washed and screened separately, and the initial mixed powder after washing and screening is divided into initial clean sand and initial slag mixture based on particle size. The initial clean sand and the initial slag mixture are dehydrated to obtain the clean sand, the slag mixture and the first wastewater.

[0008] Optionally, the step of separating the slag mixture to obtain stones, lightweight waste, and second wastewater includes: The slag mixture is subjected to slag separation treatment to determine the density of each component in the slag mixture; The slag and stone mixture is divided into initial stones and initial lightweight waste according to the density of each component in the mixture; The initial stones and the initial lightweight waste are dehydrated to obtain the stones, the lightweight waste, and the second wastewater.

[0009] Optionally, the step of obtaining screenings and sludge cake after treating the first wastewater and the second wastewater with tailwater includes: The first wastewater and the second wastewater were precipitated to obtain precipitate. The precipitated material is filtered through a fine screen to obtain the screenings and sludge. The mud-like material is extruded into shape using a plate and frame or belt dewatering machine to obtain the mud cake.

[0010] Optionally, the step of sequentially drying and crushing the bulky waste, the lightweight waste, and the screenings to produce combustible renewable fuel includes: The bulky waste, the lightweight waste, and the screenings are subjected to the drying treatment to obtain dried material after moisture removal. The dried material is subjected to the crushing process to obtain particulate matter; The particulate matter is packaged and transported to the fuel manufacturing equipment, so that the fuel manufacturing equipment can process the particulate matter into combustible renewable fuel.

[0011] Optionally, the classification of dredging materials from different sources into target dry dredging sludge material and target wet dredging sludge material based on moisture content includes: Determine whether the moisture content of the first dredged sludge material is greater than the target preset threshold, wherein the first dredged sludge material is any one of the dredged sludge materials from different sources; If the moisture content of the first dredged sludge material is greater than the target preset threshold, then the first dredged sludge material is determined as the target wet dredged sludge material. If the moisture content of the first dredged sludge material is not greater than the target preset threshold, then the first dredged sludge material is determined as the target dry dredged sludge material.

[0012] Optionally, the brick-making equipment includes a conveying mechanism, a batching mechanism, and a brick-making mechanism. The process of processing the clean sand and the mud cake through the brick-making equipment to obtain brick blanks includes: The conveying mechanism can transport the residual sludge, the cleaning sand, and the mud cake from the waterworks to the batching mechanism, so that the batching mechanism can mix the residual sludge, the cleaning sand, and the mud cake to obtain a mixed material. Cement and curing agent are added to the mixture and transported to the brick-making facility to obtain the brick blank.

[0013] In summary, it can be seen that the embodiments provided in this application aim to efficiently treat dredging sludge and waste from different sources, achieving the goals of resource recovery and volume reduction. Based on moisture content, the dredging materials are divided into target dry dredging sludge and target wet dredging sludge, achieving targeted and effective processing. The dry dredging sludge treatment line and the wet dredging sludge treatment line respectively process the corresponding target materials, optimizing the processing flow and yielding a sand mixture, bulky waste, cleaning sand, slag mixture, and wastewater. Through slag separation, stones, lightweight waste, and secondary wastewater are separated, improving the utilization value of the slag. The stones are recycled to the dry dredging sludge treatment line for further processing, and the primary wastewater... After the wastewater and second wastewater are treated, screenings and mud cake are obtained, reducing environmental pollution. Bulky waste, lightweight waste and screenings are dried and crushed to make fuel, realizing the resource utilization of waste. Clean sand and mud cake are processed by brick-making equipment to produce brick blanks, realizing the reuse of waste. The solution in this application can not only treat multi-source dredging materials from multiple sources, but also solve the problem that traditional ditch sludge treatment methods are difficult to treat bottom mud with low water content, and solve the problem that the separation of traditional slag and stone mixtures is not thorough. Furthermore, it can effectively recover and reuse various components in the dredging materials, achieving the minimization of waste and the maximization of resource utilization. Attached Figure Description

[0014] Figure 1 This is a schematic flowchart of a sludge treatment method applicable to multi-source dredging provided in an embodiment of this application; Figure 2 This is a virtual structural diagram of a sludge treatment system suitable for multi-source dredging provided in the embodiments of this application; Figure 3 This is a virtual structural diagram of the solid waste-derived fuel production provided in the embodiments of this application; Figure 4 This is a schematic diagram of the virtual structure of the brick blank provided in the embodiments of this application. Detailed Implementation

[0015] The terminology used in the following embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to include the plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this application refers to any or all possible combinations including one or more of the listed items.

[0016] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0017] Currently, the sludge generated from sewer cleaning and dredging is mainly treated by washing and screening. By controlling the washing time, water volume, and screen aperture, sand of different particle sizes and cleanliness levels can be obtained. However, other products (mainly light organic matter and large inorganic matter) are transported off-site for disposal without separation, and the disposal methods are mostly incineration and landfill. The bottom sediment dredged during the dredging of rivers and near-shore waterways is dewatered and solidified before being transported off-site for disposal, and the disposal method is mostly landfill. Due to the differences in properties, the above two types of dredging sludge need to be treated separately, and no single set of equipment can meet the needs of simultaneous treatment.

[0018] According to the latest "Classification and Code Catalogue of Solid Waste", dredging sludge includes bottom sediment removed during the dredging of rivers and near-shore waterways, as well as dredging sludge generated from the cleaning and unclogging of sewers. Multi-source dredging materials include, but are not limited to, bottom sediment and ditch sludge from the aforementioned dredging sludge, and are also applicable to the treatment of sediment, septic tank bottom sediment, screenings, and tap water plant bottom sediment generated from the dredging of water purification plants, water plants, pumping stations, and regulating reservoirs.

[0019] Because dredging sludge includes bottom mud removed during the dredging of rivers and near-shore waterways and dredging sludge generated from the cleaning and unblocking of sewers, the moisture content of the two types of dredging sludge differs greatly. In the actual dredging process, vacuum trucks are used first for dredging rivers, near-shore waterways and sewers. The dredged material sucked into the vacuum trucks has a high moisture content of about 60%. When the vacuum trucks cannot suck up the remaining material, manual cleaning is used. This part of the material is transported in woven bags, with a lower moisture content of about 30%. In addition, the bottom mud of rivers and near-shore waterways is sometimes piled up and dried nearby after dredging before being transported.

[0020] However, traditional dredging sludge treatment methods have high requirements for the moisture content of the receiving material. Since the bottom mud removed during the dredging of rivers and near-shore waterways has a low moisture content, traditional ditch sludge treatment methods are difficult to treat bottom mud with low moisture content. Therefore, this application discloses a dredging sludge treatment method applicable to multi-source dredging materials.

[0021] It should be noted that multiple sources mainly include dredged materials generated during the dredging process of rivers, lakes, reservoirs, sewage pipe networks, rainwater pipe networks, pumping stations, and regulating ponds.

[0022] Reference Figure 1 , Figure 1This is a schematic flowchart illustrating a dredging sludge treatment method applicable to multi-source dredging materials, provided in an embodiment of this application. The method is applied to a dredging sludge treatment system, which includes a dry dredging sludge treatment line, a wet dredging sludge treatment line, fuel manufacturing equipment, and brick-making equipment. The method includes the following steps: S10. Based on the moisture content, the dredging materials from different sources are divided into target dry dredging sludge materials and target wet dredging sludge materials. The process begins with collecting dredging materials from various sources, including but not limited to bottom sediment removed during river and near-shore channel dredging and sludge generated from sewer cleaning and dredging. Specialized equipment (such as a moisture meter or drying oven) can be used to measure the moisture content of the samples. Moisture content is typically expressed as a percentage, representing the proportion of water mass to total mass in the sample. For example, dredging materials with low moisture content (usually less than a certain set value, such as 30%) meet the requirements for dry sludge treatment and can be classified as target dry sludge material. Based on moisture content, effective classification of dredging materials from different sources can be ensured, providing a precise material basis for subsequent treatment stages, achieving higher treatment efficiency and better resource utilization.

[0023] In one embodiment, step S10 performs the following steps: Determine whether the moisture content of the first dredged sludge material is greater than the target preset threshold, wherein the first dredged sludge material is any kind of dredged sludge material from different sources; If the moisture content of the first dredged sludge material is greater than the target preset threshold, then the first dredged sludge material is determined as the target wet dredged sludge material. If the moisture content of the first dredged sludge material is not greater than the target preset threshold, then the first dredged sludge material is determined as the target dry dredged sludge material.

[0024] In this embodiment, firstly, the dredging sludge treatment system sets a target preset threshold for moisture content. Then, it obtains the moisture content of the first dredging sludge material and compares it with the target preset threshold to obtain a comparison structure. When the comparison result shows that the moisture content of the first dredging sludge material is greater than the target preset threshold, the first dredging sludge material is classified as target wet dredging sludge material and continues to enter the wet dredging sludge treatment line. When the comparison result shows that the moisture content of the first dredging sludge material is not greater than the target preset threshold, the first dredging sludge material is classified as target dry dredging sludge material and continues to enter the dry dredging sludge treatment line. Classifying the first dredging sludge material helps ensure the accuracy and efficiency of the treatment process, facilitating subsequent dredging sludge treatment and resource utilization.

[0025] S20. The target dry sludge material is processed through the dry sludge treatment line to obtain sand mixture and large pieces of waste. In the processing, the target dry sludge material is processed through a dry sludge treatment line to obtain a sand mixture and bulky waste. The target dry sludge material is fed into the dry sludge treatment line from the storage area via a conveying system, which may include belt conveyors, screw conveyors, etc. If the dry sludge material contains large particles or impurities, it is first crushed and mixed to ensure that the material has a uniform particle size (note that pre-crushed large materials are only for inorganic materials and can enter the dry material downstream equipment) and improve the efficiency of subsequent processing. The processed dry sludge material is separated into different particle size grades by a vibrating screen or screening machine. Smaller particles will pass through the screen, while larger particles (such as stones and large pieces of sludge) will remain on the screen. The resulting material is further separated into a sand mixture and bulky waste using separation equipment. The sand mixture usually contains finer particles, while the bulky waste contains larger solid materials. For ease of understanding, the sand mixture and bulky waste are explained below: Sand mixture: Processed fine particulate material, including sand and possibly small stones, typically used as building material, backfill material, etc.; Bulky waste: Material containing larger volumes, such as plastics, wood, metals, etc., which requires further processing to reduce its volume and for resource recovery or disposal.

[0026] In one embodiment, step S20 performs the following steps: The target dry sludge material is sorted and pre-screened to determine the particle size of each component in the target dry sludge material. Based on the particle size of each component in the target dry sludge material, the target dry sludge material is divided into bulky waste and small waste. Small pieces of waste are crushed to obtain a sand mixture.

[0027] In this embodiment, firstly, sorting is performed. The target dry sludge material is initially sorted using sorting equipment (such as manual sorting or mechanical sorting) to remove obvious impurities and large objects (such as cloth or branches). Next, after pre-screening, the sorted dry sludge material is fed into pre-screening equipment (such as a vibrating screen, drum screen, or fixed screen) to screen the target dry sludge material. This determines the particle size distribution of each component in the target dry sludge material, classifying it into different particle size grades. Specifically, the particle size of each component in the target dry sludge material is measured and recorded using different screens or other particle size measuring tools. Common screen aperture sizes can be selected as needed to classify the target dry sludge material... Sludge material is classified into large and small waste according to particle size. Large waste usually refers to larger particles or objects, while small waste includes finer particles. Finally, the small waste is sent to crushing equipment (such as crushers, pulverizers, etc.) for crushing. The purpose of crushing is to further process the small waste into smaller particles. After crushing, the material becomes a sand mixture. The solution in this application can effectively separate different components in the target dry sludge material through sorting and pre-screening, thereby improving the efficiency of subsequent processing. Through particle size classification and crushing, the particle size of the sand mixture can be precisely controlled to meet specific usage requirements. It can effectively convert dry sludge material into a usable sand mixture, while simultaneously achieving the separation and processing of large waste.

[0028] S30. The target wet sludge material and sand mixture are processed through the wet sludge treatment line to obtain clean sand, slag mixture and first wastewater. First, the target wet dredging sludge material and sand mixture are fed into the wet dredging sludge treatment line through a conveying system, including belt conveyors or screw conveyors, to properly mix the wet dredging sludge material and sand mixture to adjust material characteristics, such as moisture content or particle size, in preparation for subsequent treatment. Then, the target wet dredging sludge material and sand mixture are washed by washing and screening equipment (such as a drum stone washing machine combined with a wheel bucket sand washing machine). Finally, the materials are separated by the built-in screen of the equipment to obtain a clean sand, slag mixture and the first wastewater.

[0029] In one embodiment, step S30 performs the following steps: The target wet sludge and sand mixture were washed and screened separately, and the initial mixed powder after washing and screening was divided into initial clean sand and initial slag mixture based on particle size. The initial clean sand and initial slag mixture are dewatered to obtain clean sand, slag mixture and first wastewater.

[0030] In this embodiment, the screening equipment separates the material into an initial clean sand and an initial slag mixture based on particle size. The initial clean sand and initial slag mixture are then dewatered to remove excess water. After filtration, the final clean sand and slag mixture is obtained, while simultaneously generating the first wastewater. The solution in this application, on the one hand, combines washing and screening with dewatering, improving the purity and separation effect of the material; on the other hand, it effectively recovers the clean sand and slag mixture while treating the wastewater to meet environmental protection requirements. Specifically, the sand mixture is obtained from the dry sludge treatment line and directly enters the washing and screening system of the wet sludge treatment line. Before entering the washing and screening system, the wet sludge material needs to be sorted (manually + with fixed grids) to remove materials with a particle size greater than 100mm. Materials smaller than 100mm then enter the washing and screening system and are mixed with the sand mixture.

[0031] S40. After the slag-stone mixture is subjected to slag-stone separation treatment, stones, lightweight waste and second sewage are obtained; The process involves first separating larger stones from the slag-stone mixture using physical separation or screening equipment, then using airflow separation or flotation technology to separate lighter waste (lightweight waste) from the slag-stone mixture, and finally transporting the wastewater generated during the treatment process, including liquid waste from the separation process, and the stones to a dry sludge treatment line for further processing.

[0032] In one embodiment, step S40 performs the following steps: The slag-stone mixture is subjected to slag-stone separation treatment to determine the density of each component in the slag-stone mixture; The slag-stone mixture is divided into initial stones and initial lightweight waste based on the density of each component in the mixture. The initial stones and initial lightweight waste are dehydrated to obtain stones, lightweight waste, and second wastewater.

[0033] In this embodiment, the slag-stone mixture is subjected to slag-stone separation treatment to determine the density of each component in the slag-stone mixture. Based on the component density, the slag-stone mixture is divided into initial stones and initial light waste. The initial stones and initial light waste are dehydrated to obtain the final stones and light waste. At the same time, a second wastewater is generated, which effectively separates and treats various components in the slag-stone mixture and separates water and wastewater for subsequent treatment and resource utilization.

[0034] It should be noted that airflow separation or flotation technology can be used to separate lighter waste (light waste) from the slag-rock mixture. For ease of understanding, airflow separation or flotation technology is explained below: The principle of airflow separation is to separate materials by utilizing the different speeds of airflow. Based on the density, shape, and mass of the substances, airflow can separate lighter materials (such as lightweight waste) from heavier stones. The specific process of airflow separation involves feeding the mixture into an airflow separator. As airflow passes through the mixture, lighter materials are lifted by the airflow and carried out of the equipment, while heavier stones remain at the bottom of the separator. Lighter waste is discharged from the airflow outlet, and stones are discharged from the bottom.

[0035] The principle of flotation technology is to separate different types of solid particles by utilizing the buoyancy difference of materials in a liquid. Chemical reagents are used to generate bubbles on the surface of lighter materials, which then adhere to these bubbles and float to the surface, while heavier materials settle. The flotation process involves adding chemical reagents (such as frothers and collectors) to a mixture of slag and stone. A bubble generator produces bubbles that combine with the lighter debris in the mixture. The lighter debris attached to the bubbles floats to the surface, forming a foam layer. The lighter debris in the foam layer is scraped off, while the heavier stones settle to the bottom of the container.

[0036] S50. The stones are transferred to the dry sludge treatment line for dry sludge treatment. The separated stones are transported from the processing area to the dry sludge treatment line via conveyor belts, pneumatic pipelines, or other transmission equipment. On the dry sludge treatment line, the stones undergo further processing. First, they are crushed and mixed to ensure uniform particle size. Then, a vibrating screen or screening machine separates the processed dry sludge material into different particle size grades. Separation equipment further separates the material into sand mixtures and bulky waste. The ultimate goal is to process the stones into suitable materials or to achieve appropriate resource utilization and disposal. It is important to note that bulky waste mainly consists of organic matter, while small waste mainly consists of inorganic matter.

[0037] S60. After the first and second wastewaters are treated with tailwater, screenings and sludge cake are obtained. The first and second wastewater undergo preliminary filtration and sedimentation to remove larger suspended solids and impurities. Larger solid particles in the wastewater are removed by a grid filter to form screenings, which typically include large solid materials such as fibers and debris. The remaining wastewater is treated by sedimentation or centrifugation, and the settled sludge is further filtered or dewatered to obtain sludge cake. The sludge cake is a concentrated sludge after treatment, with a significantly reduced water content, making it easy to dispose of or further treat.

[0038] In one embodiment, step S60 performs the following steps: The first and second wastewater were precipitated to obtain precipitate. The precipitated material is filtered through a fine screen to obtain screenings and sludge. The mud-like material is extruded into shape using a plate and frame or belt dewatering machine to obtain mud cakes.

[0039] In this embodiment, firstly, the first and second wastewaters are precipitated to separate the precipitate. Then, the precipitate is filtered through a fine screen to obtain screenings (larger solid particles) and sludge (fine solid particles). The sludge is then subjected to plate and frame pressing to obtain sludge cake (dehydrated solid material). This treatment method effectively separates and concentrates the solid components in the wastewater, facilitating subsequent disposal or resource utilization.

[0040] S70. Large-sized waste, light waste, and screenings are successively dried and crushed to produce combustible renewable fuel. The process begins with drying equipment (such as dryers, hot air dryers, or pyrolysis equipment) to dry bulky waste, lightweight waste, and screenings, significantly reducing their moisture content. This drying process reduces the moisture content of the materials, improving the efficiency of subsequent processing. Then, a crusher (such as a hammer crusher, shear crusher, or jaw crusher) is used to break the dried bulky waste, lightweight waste, and screenings into smaller particles or fragments. The processed materials are then used to produce combustible fuel for energy recovery.

[0041] In one embodiment, step S70 performs the following steps: Large waste, light waste, and screenings are dried to obtain dried material after moisture removal. The dried material is crushed to obtain particulate matter; The particulate matter is packaged and transported to a fuel manufacturing facility, which then converts the particulate matter into combustible renewable fuel.

[0042] In this embodiment, bulky waste, lightweight waste, and screenings are first dried to remove moisture and obtain dried material. Then, the dried material is crushed and converted into particulate matter. Next, the particulate matter is packaged and transported to a fuel manufacturing device. Finally, in the fuel manufacturing device, the particulate matter is processed into combustible renewable fuel to facilitate energy recovery and utilization.

[0043] Specifically, the crushed materials (bulk waste, lightweight waste, and screenings) are first mixed in a certain proportion to ensure the consistency and stability of the fuel. Then, the mixture is processed into solid fuel (such as fuel blocks, pellets, or granular fuel) using pressing equipment (such as briquetting machines or pellet mills). Next, the pressed fuel is screened to separate out non-compliant particles or impurities, ensuring the quality of the final product. The resulting combustible renewable fuel can be used to replace traditional fossil fuels as part of the energy supply, reducing environmental impact and achieving resource recycling.

[0044] S80. The clean sand and mud cake are processed by brick-making equipment to obtain brick blanks.

[0045] The process involves processing clean sand and mud cake using brick-making equipment to obtain brick blanks. Specifically, firstly, clean sand (usually sieved and washed sand) is mixed with mud cake (it's important to note that the mud cake consists of two parts: one part from the system's wastewater treatment, and the other part from residual sludge from the waterworks) using mixing equipment (such as a mixer or agitator), ensuring thorough blending. Secondly, appropriate amounts of water or other additives are added as needed to adjust the moisture and binding properties of the mixture, ensuring the quality of the final brick blank. Next, the mixture is fed into the brick-making equipment, where it is pressed into the shape of a brick blank using molds. The brick-making equipment can include brick presses, extruders, or other forming equipment.

[0046] In one embodiment, step S80 performs the following steps: The residual sludge, cleaning sand, and mud cake from the waterworks can be transported to the batching unit, whereby the batching unit mixes the residual sludge, cleaning sand, and mud cake to obtain a mixed material. Cement and hardener are added to the mixture and then transported to a brick-making facility to obtain brick blanks. In this embodiment, residual sludge, clean sand, and mud cake from the waterworks are conveyed to a batching unit via a transport device (such as a conveyor belt, screw conveyor, or other conveying equipment). In the batching unit, the residual sludge, clean sand, and mud cake are uniformly mixed to obtain a mixed material. The batching unit typically includes a mixer or agitator to ensure the uniform distribution of various raw materials, and cement and a curing agent are added to the mixed material. Cement acts as a binder, and the curing agent enhances the strength and stability of the mixed material. These additives can be automatically added by the batching system to ensure the correct proportions and uniform mixing. The mixed material containing cement and curing agent is then transported to a brick-making unit. The transport device can be a conveyor belt, a loader, or other suitable equipment to ensure the material is safely and efficiently delivered to the brick-making equipment. In the brick-making unit, the mixed material is processed into brick blanks. The brick-making unit typically includes a molding machine, a brick press, or an extruder to press the mixed material into the shape of brick blanks. Through the processes of mixing, additive treatment, and molding, waste residual sludge and mud cake are transformed into usable building brick blanks, realizing the resource utilization of waste and the production of building materials. It should be noted that the bricks produced in this application are non-fired bricks. After the bricks are formed, they are cured and can be transported and sold after the curing period. This method not only realizes the resource utilization of waste, but also produces high-strength building materials.

[0047] The implementation principle of the dredging sludge treatment method applicable to multi-source dredging materials in this application embodiment is as follows: Based on the moisture content, the dredging materials are divided into target dry dredging sludge materials and target wet dredging sludge materials, realizing the targeting and effectiveness of the treatment process. The dry dredging sludge treatment line and the wet dredging sludge treatment line respectively treat the corresponding target materials, optimizing the treatment process and obtaining sand mixture, bulky waste, cleaning sand, slag mixture and sewage. Through slag separation treatment, stones, lightweight waste and second sewage are separated, improving the utilization value of slag. The stones are recycled to the dry dredging sludge treatment line for further treatment, and the first sewage and second sewage are treated by the tailwater treatment. The process yields screenings and mud cake, reducing environmental pollution. Bulky waste, lightweight waste, and screenings are dried and crushed to produce fuel, realizing the resource utilization of waste. Clean sand and mud cake are processed by brick-making equipment to produce brick blanks, realizing the reuse of waste. The solution in this application can not only handle multi-source dredging materials from multiple sources, solving the problem that traditional ditch sludge treatment methods are difficult to treat bottom mud with low water content, and solving the problem that traditional separation of slag and stone mixtures is not thorough, but also effectively recover and reuse various components in the dredging materials, achieving the minimization of waste and the maximization of resource utilization.

[0048] The embodiments of this application have been described above from the perspective of a method for treating dredged sludge suitable for multi-source dredging. The embodiments of this application will now be described below from the perspective of a system for treating dredged sludge suitable for multi-source dredging. Please refer to [link / reference]. Figure 2 , Figure 2 This is a virtual structural diagram of a sludge treatment system suitable for multi-source dredging materials, provided in an embodiment of this application.

[0049] The dry sludge treatment line (moisture content ≤30%) mainly consists of three parts: a manual sorting module, a pre-screening module, and a crushing and sand making module. First, the dry sludge is manually sorted to remove large debris such as cloth and branches. To avoid materials with a particle size ≥250mm affecting the operation of downstream equipment, the pre-screening module further filters out defective materials (particle size ≥250mm). This large debris is temporarily stored in a waste hopper. The pre-screened material enters the crushing and sand making system to produce sand. The sand then enters the wet sludge treatment line (moisture content ≥60%) to obtain high-quality clean sand. The wet sludge treatment line mainly consists of four modules: a material receiving and feeding module, a washing and screening module, a slag and stone separation module, and a tailings treatment module. Wet sludge from the wet sludge treatment line enters the washing and screening module through the material receiving and feeding module. This process screens out coarse materials (≥10mm), mainly a mixture of stones and lightweight waste. This mixture then passes through the slag and stone separation module to completely separate the lightweight materials and stones. The separated stones enter the dry sludge treatment line for crushing and sand making, while the lightweight materials are dried, crushed, and packaged into RDF (Regenerative Deposit Forming). The remaining fine materials (<10mm) are washed by a sand washing device to obtain clean sand (<10mm). The silt and sand in the system's wastewater are filtered through a fine screen and then through a plate and frame filter press to obtain sludge cake with a moisture content of <40%.

[0050] like Figure 3 As shown, screenings and bulk waste can be processed into RDF (solid waste-derived fuel) through drying, crushing, and baling, such as... Figure 4 As shown, the sand produced by the dry sludge and wet sludge treatment lines can be mixed with the residual sludge from the waterworks and, by adding a certain proportion of cement, curing agent, etc., the mixture can be made into brick blanks of a certain strength by the brick-making equipment.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for treating dredged sludge suitable for multi-source dredging, characterized in that, An application is made in a sludge treatment system, the sludge treatment system comprising a dry sludge treatment line, a wet sludge treatment line, fuel manufacturing equipment, and brick-making equipment, the method comprising: Based on moisture content, dredging materials from different sources are classified into target dry dredging sludge materials and target wet dredging sludge materials. The target dry sludge material is processed through the dry sludge treatment line to obtain a sand mixture and bulky waste. The target wet sludge material and the sand mixture are processed by the wet sludge treatment line to obtain a clean sand, slag mixture and first wastewater. The slag-stone mixture is subjected to slag-stone separation treatment to obtain stones, lightweight waste, and second sewage. The stones are transported to the dry sludge treatment line for dry sludge treatment. After the first wastewater and the second wastewater are treated with tailwater, screenings and sludge cake are obtained. The bulky waste, the lightweight waste, and the screenings are sequentially dried and crushed to produce combustible renewable fuel. The clean sand and the mud cake are processed by the brick-making equipment to obtain brick blanks.

2. The method according to claim 1, characterized in that, The process of treating the target dry sludge material through the dry sludge treatment line to obtain a sand mixture and bulky waste includes: The target dry sludge material is sorted and pre-screened to determine the particle size of each component in the target dry sludge material. Based on the particle size of each component in the target dry sludge material, the target dry sludge material is divided into large waste and small waste. The small pieces of waste are crushed to obtain the sand mixture.

3. The method according to claim 2, characterized in that, The process of treating the target wet sludge material and the sand mixture through the wet sludge treatment line to obtain a clean sand, slag mixture and first wastewater includes: The target wet sludge material and the sand mixture are washed and screened separately, and the initial mixed powder after washing and screening is divided into initial clean sand and initial slag mixture based on particle size. The initial clean sand and the initial slag mixture are dehydrated to obtain the clean sand, the slag mixture and the first wastewater.

4. The method according to claim 3, characterized in that, The process of separating the slag mixture to obtain stones, lightweight waste, and second wastewater includes: The slag mixture is subjected to slag separation treatment to determine the density of each component in the slag mixture; The slag and stone mixture is divided into initial stones and initial lightweight waste according to the density of each component in the mixture; The initial stones and the initial lightweight waste are dehydrated to obtain the stones, the lightweight waste, and the second wastewater.

5. The method according to claim 1, characterized in that, The process of obtaining screenings and sludge cake after treating the first wastewater and the second wastewater with tailwater includes: The first wastewater and the second wastewater were precipitated to obtain precipitate. The precipitated material is filtered through a fine screen to obtain the screenings and sludge. The mud-like material is extruded into shape using a plate and frame or belt dewatering machine to obtain the mud cake.

6. The method according to claim 1, characterized in that, The process of sequentially drying and crushing the bulky waste, the lightweight waste, and the screenings to produce combustible renewable fuel includes: The bulky waste, the lightweight waste, and the screenings are subjected to the drying treatment to obtain dried material after moisture removal. The dried material is subjected to the crushing process to obtain particulate matter; The particulate matter is packaged and transported to the fuel manufacturing equipment, so that the fuel manufacturing equipment can process the particulate matter into combustible renewable fuel.

7. The method according to claim 1, characterized in that, The classification of dredging materials from different sources into target dry dredging sludge material and target wet dredging sludge material based on moisture content includes: Determine whether the moisture content of the first dredged sludge material is greater than the target preset threshold, wherein the first dredged sludge material is any one of the dredged sludge materials from different sources; If the moisture content of the first dredged sludge material is greater than the target preset threshold, then the first dredged sludge material is determined as the target wet dredged sludge material. If the moisture content of the first dredged sludge material is not greater than the target preset threshold, then the first dredged sludge material is determined as the target dry dredged sludge material.

8. The method according to claim 1, characterized in that, The brick-making equipment includes a conveying mechanism, a batching mechanism, and a brick-making mechanism. The process of processing the clean sand and the mud cake through the brick-making equipment to obtain brick blanks includes: The conveying mechanism can transport the residual sludge, the cleaning sand, and the mud cake from the waterworks to the batching mechanism, so that the batching mechanism can mix the residual sludge, the cleaning sand, and the mud cake to obtain a mixed material. Cement and curing agent are added to the mixture and transported to the brick-making facility to obtain the brick blank.

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