Method for preparing a sewage treatment device and material using aluminum dross and product thereof

Abstract

The present application relates to waste resource utilization technical field, especially to a kind of method for preparing sewage treatment device and material using aluminum ash and its product. Wherein, a prefabricated sewage treatment device includes flocculation tank, first sedimentation tank, second sedimentation tank and feeding device;The flocculation tank, the first sedimentation tank and the second sedimentation tank are sequentially arranged and connected, and the sewage to be treated sequentially passes through the flocculation tank, the first sedimentation tank and the second sedimentation tank to complete flocculation and sedimentation treatment;The flocculation tank, the first sedimentation tank and the second sedimentation tank all include reinforced skeleton and aluminum ash-containing concrete layer;The feeding device is communicated with the flocculation tank by pipeline, and the sewage treatment material containing aluminum ash stored in the feeding device enters the flocculation tank from the top of the flocculation tank through the pipeline, mixes with the sewage to be treated and flocculates. Realize the continuous treatment process of sewage, effectively improve the sewage treatment efficiency.

Description

Technical Field

[0001] This invention relates to the field of waste resource utilization technology, and in particular to a method and product for preparing wastewater treatment devices and materials using aluminum ash. Background Technology

[0002] As the world's largest producer and consumer of aluminum, my country produces approximately 2 million tons of aluminum ash annually, and it is listed as a hazardous waste in the National Hazardous Waste List (2021). Aluminum ash is a byproduct generated during aluminum electrolytic smelting, aluminum alloy recycling, and the production and processing of aluminum products. Its main components are elemental aluminum, alumina, and other oxides.

[0003] Wastewater treatment in rivers is a crucial area of ​​water treatment. In recent years, rapid industrial development has led to severe environmental pollution, with many water bodies in my country suffering from serious contamination, particularly lakes and rivers. Problems include turbidity, excessive nitrogen and phosphorus levels, and high concentrations of organic matter, causing significant inconvenience to people's lives. Furthermore, most existing wastewater treatment methods employ zoned flocculation and sedimentation. This method increases costs and manpower, and the pollutants formed through flocculation settle to the riverbed by gravity, mixing with the silt. This creates costly and technical challenges for separating silt from pollutants in subsequent secondary treatment processes. Therefore, there is a growing demand for a solution that can both treat wastewater and separate pollutants from sludge.

[0004] Flocculation is the process of aggregating pollutants in water to form aggregates, thereby achieving sedimentation. The effectiveness of flocculation and sedimentation is mainly influenced by the type of flocculant and the hydraulic conditions. Therefore, optimizing flocculant materials and hydraulic conditions has been extensively studied.

[0005] Concrete is a widely used material in civil engineering today. 3D printing concrete technology involves using a 3D printing device to print concrete slurry along a pre-designed path, ultimately producing the designed concrete component. This construction method is not limited by the formwork and construction techniques required by traditional methods, and can achieve the construction of more complex concrete structures. Summary of the Invention

[0006] The purpose of this invention is to provide a method and product for preparing wastewater treatment devices and materials using aluminum ash, so as to solve at least one technical problem existing in the prior art.

[0007] To solve the above-mentioned technical problems, the present invention provides a prefabricated sewage treatment device, including a flocculation tank, a first sedimentation tank, a second sedimentation tank, and a feeding device; The flocculation tank, the first sedimentation tank, and the second sedimentation tank are arranged in sequence and connected. The wastewater to be treated passes through the flocculation tank, the first sedimentation tank, and the second sedimentation tank in sequence to complete the flocculation and sedimentation treatment. The flocculation tank, the first sedimentation tank and the second sedimentation tank all include a steel frame and an aluminum-containing gray concrete layer; The feeding device is connected to the flocculation tank through a pipeline. The wastewater treatment liquid stored in the feeding device enters the flocculation tank from the top of the flocculation tank through the pipeline and mixes with the wastewater to be treated and flocculates. The wastewater treatment solution is obtained by dissolving wastewater treatment materials containing aluminum ash in water.

[0008] Furthermore, the flocculation tank includes a flocculation inlet, a flocculation outlet, a turbulence-inducing component, and a flocculation flow channel; The flocculation inlet and the flocculation outlet are located on both sides of the flocculation tank and are used for the inlet and outlet of sewage, respectively. The flocculation channel is located in the flocculation tank to guide the flow of sewage and create disturbances during the flow, thereby improving flocculation efficiency. The turbulence-inducing components are disposed between the flocculation channels to generate vortices during the flow of sewage, thereby increasing turbulent kinetic energy and turbulent kinetic energy dissipation rate and thus improving the flocculation effect.

[0009] Furthermore, the flocculation channel includes an inlet channel and an interleaved channel; The inlet channel includes a first horizontal section, a first arc-shaped section, a first vertical section, a second arc-shaped section, and a third arc-shaped section; The first horizontal section is connected to the wall above the inlet of the flocculation tank; The end of the first horizontal section away from the upper part of the wall above the inlet of the flocculation tank is connected to the first arc-shaped section; The first arc segment and the second arc segment are connected by the first vertical segment; The first arc-shaped segment, the first vertical segment, and the second arc-shaped segment together form a U-shaped structure, and the opening direction of the U-shaped structure is opposite to the inlet direction of the flocculation tank. The third arc segment is located at the end of the second arc segment away from the first vertical segment, and tends to be away from the side wall of the flocculation inlet. Multiple staggered flow channels are provided in the flocculation tank; The ends of the interlaced flow channels are connected to the top or bottom wall of the flocculation tank through vertical flow channels. That is, after a certain interlaced flow channel is connected to the top wall, its adjacent interlaced flow channel is connected to the bottom wall. The interlaced flow channels have an S-shaped wave structure. The S-shaped wave structures of two adjacent interlaced flow channels are arranged in a non-parallel manner, that is, there are cavities formed by mutual distance and narrow passages formed by mutual proximity between two adjacent interlaced flow channels. The turbulence-disrupting component is disposed in the cavity.

[0010] Furthermore, the first sedimentation tank includes a first sedimentation inlet, a first sedimentation outlet, and a first sedimentation flow channel; The first sedimentation inlet and the first sedimentation outlet are located on both sides of the first sedimentation tank and are used for the inflow and outflow of sewage, respectively. The first sedimentation inlet and the flocculation outlet are arranged opposite to each other; The first sedimentation channel is located in the first sedimentation tank to reduce eddies in the fluid, increase the fluid's travel distance, and settle large particulate impurities in the fluid.

[0011] Furthermore, the first sedimentation channel includes a receiving channel, a T-shaped channel, and an L-shaped channel; One end of the receiving channel is located on the side wall below the first sedimentation inlet, and the other end is a free end, used to receive the fluid flowing out of the flocculation tank; The T-shaped flow channel includes a second vertical section, a second horizontal section, and a first convex section; The upper end of the second vertical section is connected to the top wall of the first sedimentation tank, and the other end is connected to the second horizontal section; The connection between the second vertical segment and the second horizontal segment has an arc-shaped chamfered structure; The distance between the inlet channel and the second horizontal section is the same as the distance between the second horizontal section and the bottom wall of the first sedimentation tank; The first convex section is located at the end of the second horizontal section away from the first sedimentation inlet; The height of the first convex section is higher than the height of the second horizontal section; The lower end face of the first convex section is on the same horizontal plane as the lower end face of the second horizontal section; The upper end face of the first convex section and the upper end face of the second horizontal section have an arc-shaped chamfer structure; The L-shaped flow channel includes a third vertical section, a third horizontal section, a fourth arc-shaped section, and a fourth horizontal section; The lower end of the third vertical section is connected to the bottom wall of the first sedimentation tank; The third horizontal segment is connected to the side of the third vertical segment; The fourth arc segment is connected to the end of the third horizontal segment away from the third vertical segment, and the other end of the fourth arc segment is connected to the fourth horizontal segment.

[0012] Furthermore, the second sedimentation tank includes a second sedimentation inlet, a second sedimentation outlet, and a second sedimentation flow channel; The second sedimentation inlet and the second sedimentation outlet are located on both sides of the second sedimentation tank and are used for the inlet and outlet of sewage, respectively. The second sedimentation inlet and the first sedimentation outlet are positioned opposite each other; The second sedimentation channel is located in the second sedimentation tank and is used to settle particulate impurities in the fluid.

[0013] Furthermore, the second sedimentation channel includes a lower channel and an upper channel; The lower flow channel includes a fifth horizontal section, a fifth arc-shaped section, and a second convex section; One end of the fifth horizontal section is set on the side wall above the second sedimentation inlet, and the other end is connected to the fifth arc-shaped section; The end of the fifth arc-shaped segment away from the fifth horizontal segment is connected to the second convex segment; The height of the second convex section is the same as the height of the fifth arc-shaped section; The lower end face of the second convex segment is on the same horizontal plane as the lower end of the connection point of the fifth arc segment; The upper flow channel includes a fourth vertical section, a sixth horizontal section, a sixth arc-shaped section, and a sixth horizontal section; The lower end of the fourth vertical section is connected to the bottom wall of the second sedimentation tank, and the vertical height of the fourth vertical section is higher than that of the lower flow channel; The sixth horizontal segment is connected to the side of the fourth vertical segment; The sixth arc-shaped segment is connected to the side of the sixth horizontal segment away from the fourth vertical segment; The other side of the sixth arc-shaped segment is connected to the sixth horizontal segment.

[0014] Furthermore, it also includes wastewater testing devices, lifting rings, and connecting components; The wastewater detection device is installed on the upper side wall of the first sedimentation outlet and the lower side wall of the second sedimentation outlet, and is used to monitor the pollutant content of the fluid. Multiple lifting rings are provided on the flocculation tank, the first sedimentation tank, and the second sedimentation tank; The upper end of the lifting ring is exposed above the aluminum-containing gray concrete layer, and the lower end of the lifting ring is embedded in the aluminum-containing gray concrete layer and tied to the steel reinforcement skeleton. The connecting component includes a connecting seat and a connecting block; The connecting seat and the connecting block are arranged in pairs at corresponding positions on the top of two adjacent tanks of the flocculation tank, the first sedimentation tank and the second sedimentation tank; The upper parts of the connecting seat and the connecting block are exposed above the aluminum-containing gray concrete and connected by fasteners. The bottom of the connecting seat and the connecting block are embedded in the aluminum-containing gray concrete layer and welded to the reinforcing steel skeleton.

[0015] Secondly, this application also discloses a method for preparing aluminum-containing ash concrete, including the following steps: S1: Grind and deoxidize the aluminum ash, place the deoxidized aluminum ash in an alkaline solution, add Ca(OH)2 solution and hydrolyze at 95℃ for 3 h, and separate the solid and liquid substances after the reaction to obtain aluminum ash treated material. S2: Add 75-110 parts of silicate cement, 90-120 parts of medium sand, 10-30 parts of fly ash and 0-15 parts of aluminum ash treatment material to a cement paste mixer and mix thoroughly to obtain powdered cement-based material. S3: Add 34.2-41.8 parts water, 0.585-0.72 parts water-reducing agent, 0.045-0.055 parts water-retaining agent, 0.045-0.055 parts defoamer, and 0.045-0.055 parts latex powder, and stir evenly with a magnetic stirrer to obtain a mixed aqueous solution; S4: Slowly add the mixed aqueous solution to the powdered cement-based material and mix evenly to obtain a printing paste. Slowly add 0.09-0.11 parts of epoxy resin binder to the printing paste to obtain 3D printed concrete material.

[0016] Furthermore, in step S3, the water-reducing agent is polycarboxylic acid, the water-retaining agent is cellulose ether, and the defoamer is a higher alcohol.

[0017] Thirdly, this application also discloses a method for preparing the wastewater treatment material containing aluminum ash as claimed in the claims, comprising the steps of: X1: Weigh 5-15 parts aluminum ash, add 20-40 parts deionized water, mix well, then add 30 parts 31%-35% hydrochloric acid, and seal the beaker. Place the beaker in a magnetically stirred water bath, maintain the temperature at 60-80℃, and react for 2.5-3.5 hours. Cool to room temperature. Seal the reacted solution and place it in an oven to mature at 50-70℃ for 24-48 hours. Filter to obtain a PAC solution. Place the solution in a constant temperature drying oven and dry at 170-200℃ for 1.5-2.5 hours. Grind to obtain polyaluminum chloride powder.

[0018] X2: Take 3-10 parts of oyster shell powder and soak it in 100 parts of 0.0625-0.3125 mol / L Cu(NO3)23H2O solution. Stir magnetically at room temperature for 5-7 h, filter, and place the filtered material in a constant temperature drying oven. Dry at 60-80 ℃ for 3-5 h. After taking it out, wash it 3-5 times with deionized water and anhydrous ethanol, and calcine it in a muffle furnace at 400-600 ℃ for 1-2 h. Take it out and grind it to obtain copper oxide-loaded oyster shells.

[0019] X3: Weigh 5-15 parts of polyaluminum chloride, 0-1 parts of polyacrylamide, and 0-80 parts of oyster shell powder loaded with copper oxide. Stir magnetically for 3-5 hours and let stand for 30 minutes. Place in a constant temperature drying oven and dry at 60-80℃ to constant weight. Remove and let stand to cool to obtain the polyaluminum chloride-polyacrylamide-copper oxide-oyster shell composite material (PAC-PAM-CuO-Os).

[0020] 10. The method for preparing the wastewater treatment material containing aluminum ash according to claim 9, characterized in that the fineness of the oyster shell powder is 200-2000 mesh, and it is calcined at 300-400℃ for 2-4 h.

[0021] By adopting the above technical solution, the present invention has the following beneficial effects: (1) This wastewater treatment device can both flocculate pollutants in wastewater and collect them in the device, thus achieving the separation and collection of pollutants and sludge. At the same time, the device is mainly composed of four parts: flocculation tank 1, first sedimentation tank 2, second sedimentation tank 3 and feeding device 4. By arranging and connecting them in sequence, a continuous wastewater treatment process is realized, which effectively improves the wastewater treatment efficiency.

[0022] (2) The device adopts a prefabricated structure, with each pool connected by detachable fasteners 93. At the same time, each pool is equipped with a pre-embedded lifting ring, which facilitates on-site assembly and disassembly. This not only reduces the difficulty and cost of construction, but also helps with subsequent maintenance and repair work.

[0023] (3) The flocculation tank 1 in the wastewater treatment device adopts an arc-shaped flow channel. Compared with the zigzag flow channel, the arc-shaped flow channel has a larger turbulent kinetic energy dissipation rate and turbulent kinetic energy, indicating that the fluid has a greater stirring and flow capacity, which can effectively promote the collision and combination of particles, increase the collision opportunities, and improve the flocculation efficiency. At the same time, a prismatic turbulence structure is set inside the flocculation tank 1, and relatively small vortices are generated near the turbulence structure, which further increases the turbulent kinetic energy and turbulent kinetic energy dissipation rate inside the flow channel, and improves the flocculation effect.

[0024] (4) The feeding device is connected to the flocculation tank through pipelines, which enables flexible addition of wastewater treatment liquid and facilitates adjustment of the dosage according to the wastewater properties and treatment requirements. The wastewater detection device can monitor the pollutant content of the fluid in real time during the treatment process to ensure that the effluent quality meets the standards.

[0025] (5) The sedimentation tank uses some arc-shaped flow channels and adds vortex structures near the flow channels. Although small particles are more likely to be resuspended in this flow phenomenon, thus slowing down the settling, large particles can effectively utilize the energy of the vortex and move downward quickly, thereby improving the settling efficiency. Combined with wastewater treatment materials containing aluminum ash, pollutants are more likely to settle in the device.

[0026] (6) The flocculation tank, the first sedimentation tank, and the second sedimentation tank are all constructed with a reinforced steel frame and an aluminum-containing gray concrete layer, which enhances the stability and durability of the overall structure. This structure is not only corrosion-resistant and impermeable, but also effectively resists chemical erosion and physical impact that may occur during sewage treatment.

[0027] (7) The aluminum ash is processed and applied to concrete and sewage treatment materials, which not only realizes the resource utilization of hazardous waste and reduces environmental pollution, but also conforms to the concept of "green and environmental protection". (7) The aluminum ash is further processed to remove elemental aluminum, aluminum nitride and other impurities. This is mainly to prevent the impurities from reacting with water vapor in the air to generate gas, thereby reducing the impact on the strength of concrete. The aluminum ash treatment material replaces part of the silicate cement, which can inhibit the early hydration heat release of concrete and reduce the risk of concrete cracking.

[0028] (8) Concrete material with appropriate aluminum ash content has good physical and mechanical properties and printability, and can be used for 3D printing construction of various complex structures. At the same time, the concrete material has a simple preparation process, is easy to operate, and is easy to realize industrial production and promotion.

[0029] (9) By transforming oyster shells, a common waste, into a highly efficient wastewater treatment material containing aluminum ash, not only is resource reuse achieved, but waste accumulation and environmental pollution are also reduced, which is in line with the concepts of green chemistry and circular economy. Copper oxide is loaded onto oyster shell powder using an impregnation method, ensuring efficient loading of copper oxide on the surface of oyster shells, thereby improving its bactericidal performance.

[0030] (10) By combining polyacrylamide, copper oxide-loaded oyster shells, and polyaluminum chloride, not only can the flocculation effect of wastewater treatment materials be improved, but they also have a good bactericidal effect, realizing the multifunctional role of composite materials in the field of water treatment. At the same time, the preparation process of composite materials is relatively simple and easy to implement and control in industrial production. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 A three-dimensional structural diagram of a prefabricated wastewater treatment device; Figure 2 This is a sectional three-dimensional structural diagram of a prefabricated wastewater treatment device. Figure 3 This is a three-dimensional structural diagram of the flocculation tank from a first-person perspective. Figure 4 This is a three-dimensional structural diagram of the flocculation tank from a second perspective. Figure 5 This is a plan view of the internal structure of the flocculation tank; Figure 6 A three-dimensional structural diagram of the steel reinforcement frame of the flocculation tank from a first-view perspective; Figure 7 This is a three-dimensional structural diagram of the steel reinforcement frame of the flocculation tank from a second perspective. Figure 8 This is a three-dimensional structural diagram of the first sedimentation tank from a first-view perspective. Figure 9 This is a three-dimensional structural diagram of the first sedimentation tank from a second perspective; Figure 10 This is a plan view of the internal structure of the first sedimentation tank; Figure 11 This is a three-dimensional structural diagram of the steel reinforcement frame of the first sedimentation tank; Figure 12 This is a three-dimensional structural diagram of the second sedimentation tank from a first-view perspective. Figure 13 This is a three-dimensional structural diagram of the second sedimentation tank from a second perspective. Figure 14 This is a plan view of the internal structure of the second sedimentation tank; Figure 15 This is a three-dimensional structural diagram of the steel reinforcement frame for the second sedimentation tank. Figure 16 for Figure 1 A partially enlarged schematic diagram of the structure at point A; Figure 17 for Figure 6 A magnified view of the structure at point B in the middle; Figure 18 for Figure 7 A magnified view of the structure at point C; Figure 19 for Figure 15 A magnified view of the structure at point D.

[0033] Figure label: 1- Flocculation tank; 11- Flocculation inlet; 12- Flocculation outlet; 13- Turbulence component; 14- Flocculation channel; 141- Inlet channel; 141a- First horizontal section; 141b- First arc-shaped section; 141c- First vertical section; 141d- Second arc-shaped section; 141e- Third arc-shaped section; 142- Cross-flow channel; 143- Vertical channel; 15- Cavity; 16- Narrow passage; 2- First sedimentation tank; 21- First sedimentation inlet; 22- First sedimentation outlet; 23- First sedimentation channel; 231- Connecting channel; 232- T-shaped channel; 232a- Second vertical section; 232b- Second horizontal section; 232c- First protruding section; 233- L-shaped channel; 233a - Third vertical section; 233b - Third horizontal section; 233c - Fourth arc-shaped section; 233d - Fourth horizontal section; 3 - Second sedimentation tank; 31 - Second sedimentation inlet; 32 - Second sedimentation outlet; 33 - Second sedimentation channel; 331 - Lower channel; 331a - Fifth horizontal section; 331b - Fifth arc-shaped section; 331c - Second convex section; 332 - Upper channel; 332a - Fourth vertical section; 332b - Sixth horizontal section; 332c - Sixth arc-shaped section; 332d - Sixth horizontal section; 4 - Feeding device; 5 - Steel reinforcement frame; 6 - Aluminum-containing gray concrete layer; 7 - Wastewater detection device; 8 - Lifting ring; 9 - Connecting component; 91 - Connecting seat; 92 - Connecting block; 93 - Fastener. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] It should also be noted that the specific embodiments or implementation methods described below are a series of optimized settings listed by the present invention to further explain the specific content of the invention, and these settings can be combined or used in conjunction with each other.

[0038] The present invention will be further explained below with reference to specific embodiments.

[0039] Example 1 like Figure 1-2 As shown, this embodiment provides a prefabricated sewage treatment device, including a flocculation tank 1, a first sedimentation tank 2, a second sedimentation tank 3, and a feeding device 4; The flocculation tank 1, the first sedimentation tank 2, and the second sedimentation tank 3 are arranged in sequence and connected. The wastewater to be treated passes through the flocculation tank 1, the first sedimentation tank 2, and the second sedimentation tank 3 in sequence to complete the flocculation and sedimentation treatment. The flocculation tank 1, the first sedimentation tank 2 and the second sedimentation tank 3 each include a steel frame 5 and an aluminum-containing gray concrete layer 6. The feeding device 4 is connected to the flocculation tank 1 through a pipeline. The wastewater treatment liquid stored in the feeding device 4 enters the flocculation tank 1 from the top of the flocculation tank 1 through the pipeline and mixes and flocculates with the wastewater to be treated. The wastewater treatment solution is obtained by dissolving wastewater treatment materials containing aluminum ash in water.

[0040] The prefabricated wastewater treatment device disclosed in this application, during operation, allows the wastewater to be treated to pass sequentially through the flocculation tank 1, the first sedimentation tank 2, and the second sedimentation tank 3. The feeding device 4 adds wastewater treatment liquid to the flocculation tank 1. The wastewater treatment liquid is prepared by dissolving a wastewater treatment material containing aluminum ash and is used to flocculate the wastewater in the flocculation tank 1. The feeding device 4 feeds the liquid through a feeding port at the top of the flocculation tank 1, causing the wastewater treatment liquid to move from top to bottom, perpendicular to the flow of the wastewater to be treated. This feeding method has two main advantages: firstly, it generates strong shear force, allowing the wastewater treatment liquid to disperse quickly in the water flow. This shear force helps break up agglomerates and improves mixing uniformity. Secondly, it generates eddies, enhancing the interaction between fluids and allowing the wastewater treatment liquid to diffuse and mix more quickly in the water. Furthermore, preferably, the device uses two feeding ports to increase the contact area between the liquid and the water flow, thereby promoting effective mixing of the liquid and the water.

[0041] like Figure 3-7 As shown, as a further embodiment of this application, the flocculation tank 1 includes a flocculation inlet 11, a flocculation outlet 12, a turbulence-inducing component 13, and a flocculation channel 14. The flocculation inlet 11 and the flocculation outlet 12 are located on both sides of the flocculation tank 1 and are used for the inlet and outlet of sewage, respectively. The flocculation channel 14 is installed in the flocculation tank 1 to guide the flow of sewage and generate disturbance when the sewage flows, thereby improving the flocculation efficiency. The turbulence-inducing component 13 is disposed between the flocculation channels 14 to generate vortices during the flow of sewage, thereby increasing turbulent kinetic energy and turbulent kinetic energy dissipation rate and thus improving the flocculation effect.

[0042] In the prefabricated wastewater treatment device disclosed in this application, the turbulence-inducing component 13 in the flocculation tank 1 mainly serves to improve the mixing degree of the water flow within the flocculation tank 1. The applicant's research revealed that without the turbulence-inducing component 13, although the water flow can generate a jet stream in the narrow opening, in the wide area the water flow will flow at high speed on one side, while a slower-moving rotating vortex will form on the other side, which is not conducive to the mixing of fluids and effective collisions between particles. However, after adding the turbulence-inducing component 13 in the wide area, when the water flow exhibits a jet phenomenon in the narrow opening, the presence of the turbulence-inducing component 13 will cause flow diversion, resulting in higher flow velocities on both sides, increasing the number of vortices near the arc-shaped guide plate and the turbulence-inducing component 13, and improving the coagulation effect.

[0043] like Figure 5 As shown, as a further embodiment of this application, the flocculation channel 14 includes an inlet channel 141 and an interleaved channel 142. The inlet channel 141 includes a first horizontal section 141a, a first arc-shaped section 141b, a first vertical section 141c, a second arc-shaped section 141d, and a third arc-shaped section 141e; The first horizontal section 141a is connected to the wall above the inlet of the flocculation tank 1; One end of the first horizontal section 141a, away from the wall above the inlet of the flocculation tank 1, is connected to the first arc-shaped section 141b. The first arc segment 141b and the second arc segment 141d are connected by the first vertical segment 141c; The first arc-shaped segment 141b, the first vertical segment 141c, and the second arc-shaped segment 141d together form a U-shaped structure, and the opening direction of the U-shaped structure is opposite to the inlet direction of the flocculation tank 1. The third arc segment 141e is located at the end of the second arc segment 141d away from the first vertical segment 141c, and tends to be away from the side wall of the flocculation inlet 11. Multiple staggered flow channels 142 are provided in the flocculation tank 1; The ends of the interlaced flow channels 142 are interlaced with the top or bottom wall of the flocculation tank 1 through vertical flow channels 143. That is, after a certain interlaced flow channel 142 is connected to the top wall, its adjacent interlaced flow channels 142 are connected to the bottom wall. The staggered flow channel 142 has an S-shaped wave structure. The S-shaped wave structures of two adjacent staggered flow channels 142 are arranged in a non-parallel manner, that is, there are cavities 15 formed far apart from each other and narrow passages 16 formed close to each other between two adjacent staggered flow channels 142. The turbulence-disrupting component 13 is disposed in the cavity 15.

[0044] The prefabricated wastewater treatment device disclosed in this application, during operation, expands the space near the flocculation inlet inlet through the inlet channel 141. This allows the wastewater to flow slowly into the flocculation inlet, and facilitates the feeding system to deliver the chemical solution through the transport pipe to the feeding port above the flocculation tank 1, where it mixes with the wastewater. The staggered channels 142 create a fluid space with constantly changing width. As the water flows upward, a jet phenomenon forms at the narrow opening, and this jet possesses strong kinetic energy, generating high impact force and forming eddies and turbulence when mixed with the surrounding fluid. The use of arc-shaped channels causes the tangential direction of the guide wall to change constantly, improving the boundary layer separation phenomenon per unit area. This boundary layer separation separates the water body into irregular eddies, improving the mixing effect and enhancing the collision efficiency between particles. Simultaneously, the arc-shaped channels increase the turbulent kinetic energy dissipation rate within the model, converting some energy into the energy required for collisions between particles within the fluid, increasing the effective collision between particles, and thus enhancing the flocculation effect. In addition, the flocculation outlet 12 is located in the wide area of ​​the arc-shaped guide plate, and no turbulence-causing component 13 is set in this area. The reason for this design is to reduce the turbulent kinetic energy and turbulent kinetic energy dissipation rate of the fluid at the outlet, thereby reducing the shear force of the fluid at the outlet and avoiding the breakage of the large-diameter flocs formed after flocculation due to excessive shear force.

[0045] like Figure 8-11 As shown, as a further embodiment of this application, the first sedimentation tank 2 includes a first sedimentation inlet 21, a first sedimentation outlet 22, and a first sedimentation channel 23; The first sedimentation inlet 21 and the first sedimentation outlet 22 are located on both sides of the first sedimentation tank 2, and are used for the inlet and outlet of sewage, respectively. The first sedimentation inlet 21 and the flocculation outlet 12 are arranged opposite to each other; The first sedimentation channel 23 is disposed in the first sedimentation tank 2 to reduce eddies in the fluid, increase the fluid travel distance, and settle large particulate impurities in the fluid.

[0046] like Figure 10 As shown, as a further embodiment of this application, the first sedimentation channel 23 includes a receiving channel 231, a T-shaped channel 232, and an L-shaped channel 233; One end of the receiving channel 231 is located on the side wall at the lower end of the first sedimentation inlet 21, and the other end is a free end, used to receive the fluid flowing out of the flocculation tank 1; The T-shaped flow channel 232 includes a second vertical section 232a, a second horizontal section 232b, and a first convex section 232c; The upper end of the second vertical section 232a is connected to the top wall of the first sedimentation tank 2, and the other end is connected to the second horizontal section 232b; The connection between the second vertical segment 232a and the second horizontal segment 232b has an arc-shaped chamfered structure; The distance between the inlet channel 231 and the second horizontal section 232b is the same as the distance between the second horizontal section 232b and the bottom wall of the first sedimentation tank 2; The first convex section 232c is located at the end of the second horizontal section 232b that is away from the first sedimentation inlet 21; The height of the first convex segment 232c is higher than the height of the second horizontal segment 232b; The lower end face of the first protruding section 232c is on the same horizontal plane as the lower end face of the second horizontal section 232b; The upper end face of the first convex section 232c and the upper end face of the second horizontal section 232b have an arc-shaped chamfer structure. The L-shaped flow channel 233 includes a third vertical section 233a, a third horizontal section 233b, a fourth arc-shaped section 233c, and a fourth horizontal section 233d; The lower end of the third vertical section 233a is connected to the bottom wall of the first sedimentation tank 2; The third horizontal segment 233b is connected to the side of the third vertical segment; The fourth arc segment 233c is connected to the end of the third horizontal segment 233b away from the third vertical segment, and the other end of the fourth arc segment 233c is connected to the fourth horizontal segment 233d.

[0047] In the prefabricated wastewater treatment device disclosed in this application, the T-shaped flow channel 232 in the first sedimentation tank 2 horizontally divides the area of ​​the first sedimentation tank 2 into two parts. This design is primarily for two reasons. Firstly, the inlet of the first sedimentation tank 2 is relatively high. If the design concept of the second sedimentation tank 3 were followed, it would not only fail to effectively utilize the space within the model, resulting in wasted space, but would also affect the sedimentation effect of particles within the sedimentation tank. Secondly, when the water flows out from the flocculation outlet 12, it is in a mixed state, with numerous vortex structures inside the water flow, which is not conducive to sedimentation. However, the connecting flow channel 231, the T-shaped flow channel 232, and the bottom wall of the first sedimentation tank 2 form a horizontal flow channel of the same width, making the water flow smoother in the first half, reducing the turbulent state inside the water flow, and placing the particles in a state more conducive to sedimentation. The rear half of the model is primarily used for particle sedimentation. The L-shaped flow channel 233 increases the fluid movement path and residence time, thereby improving the sedimentation effect. The first sedimentation outlet 22 is located at the bottom of the model to connect with the second sedimentation tank 3, facilitating the design of the internal structure of the second sedimentation tank 3. In summary, the first sedimentation tank 2 has two main functions: firstly, it connects the flocculation tank 1 and the second sedimentation tank 3, reducing vortex structures within the fluid, lowering the degree of turbulence, and making the water flow smoother, placing particles in a more suitable state for sedimentation; secondly, the first sedimentation tank 2 can be used to settle large-diameter particles and treat some small- and medium-diameter particles.

[0048] like Figure 12-15 As shown, as a further embodiment of this application, the second sedimentation tank 3 includes a second sedimentation inlet 31, a second sedimentation outlet 32, and a second sedimentation channel 33. The second sedimentation inlet 31 and the second sedimentation outlet 32 ​​are located on both sides of the second sedimentation tank 3, and are used for the inlet and outlet of sewage, respectively. The second sedimentation inlet 31 and the first sedimentation outlet 22 are arranged opposite to each other; The second sedimentation channel 33 is provided in the second sedimentation tank 3 for settling particulate impurities in the fluid.

[0049] like Figure 14 As shown, as a further embodiment of this application, the second sedimentation channel 33 includes a lower channel 331 and an upper channel 332. The lower flow channel 331 includes a fifth horizontal section 331a, a fifth arc-shaped section 331b, and a second convex section 331c; One end of the fifth horizontal section 331a is disposed on the side wall above the second sedimentation inlet 31, and the other end is connected to the fifth arc-shaped section 331b; The end of the fifth arc-shaped segment 331b that is away from the fifth horizontal segment 331a is connected to the second convex segment 331c; The height of the second convex segment 331c is the same as the height of the fifth arc segment 331b; The lower end face of the second protruding section 331c is on the same horizontal plane as the lower end of the connection point of the fifth arc-shaped section 331b; The upper flow channel 332 includes a fourth vertical section 332a, a sixth horizontal section 332b, a sixth arc-shaped section 332c, and a sixth horizontal section 332d; The lower end of the fourth vertical section 332a is connected to the bottom wall of the second sedimentation tank 3, and the vertical height of the fourth vertical section 332a is higher than that of the lower flow channel 331; The sixth horizontal segment 332b is connected to the side of the fourth vertical segment 332a; The sixth arc-shaped segment 332c is connected to the side of the sixth horizontal segment 332b away from the fourth vertical segment 332a; The other side of the sixth arc segment 332c is connected to the sixth horizontal segment 332d.

[0050] In the prefabricated wastewater treatment device disclosed in this application, the inlet of the second sedimentation tank 3 is designed at the lower part of the model. This serves two purposes: firstly, it reduces the distance for particles to settle to the bottom surface, making it easier for particles to settle within the device; secondly, it allows for full utilization of the space within the model using other structures. The model is equipped with a lower flow channel 331 and an upper flow channel 332, dividing the device into three regions. This increases the fluid's movement path and residence time within the device, enabling particles to settle in all three regions. Firstly, compared to a horizontal plate, it fully utilizes the effective space within the model, expanding the area of ​​the second and third regions while minimizing any adverse settling effect on the first region, thus improving the settling effect of particles in the second and third regions and overall enhancing the settling effect of particles in the model. Secondly, compared to a bent plate, the water flow generates a certain vortex structure near the arc-shaped guide plate. A suitable vortex structure can allow larger diameter particles to settle more quickly on the bottom surface of the guide plate, thereby enhancing the settling effect of larger diameter particles in the second and third regions. The second sedimentation tank 3 is equipped with a second protruding section 331c, which can effectively trap particles settling in the second area for sediment collection. The sixth horizontal section 332b and the sixth arc-shaped section 332c also serve a similar purpose. The outlet 32 ​​of the second sedimentation tank is designed to be in the same position and with the same width as the inlet 31 of the second sedimentation tank. The purpose of this design is that if one sedimentation tank 3 cannot meet the project design requirements, another sedimentation tank identical to the second sedimentation tank 3 can be installed after the second sedimentation tank 3 to improve the overall particle settling effect of the system.

[0051] like Figure 16-19 As shown, as a further embodiment of this application, it also includes a wastewater detection device 7, a lifting ring 8, and a connecting member 9; The wastewater detection device 7 is installed on the upper side wall of the first sedimentation outlet 22 and the lower side wall of the second sedimentation outlet 32, and is used to monitor the pollutant content of the fluid. Multiple lifting rings 8 are provided on the flocculation tank 1, the first sedimentation tank 2 and the second sedimentation tank 3; The upper end of the lifting ring 8 is exposed above the aluminum-containing gray concrete layer 6, and the lower end of the lifting ring 8 is embedded in the aluminum-containing gray concrete layer 6 and tied to the steel reinforcement skeleton 5. The connecting member 9 includes a connecting seat 91 and a connecting block 92; The connecting seat 91 and the connecting block 92 are arranged in pairs at corresponding positions on the top of two adjacent tanks of the flocculation tank 1, the first sedimentation tank 2 and the second sedimentation tank 3; The upper parts of the connecting seat 91 and the connecting block 92 are exposed above the aluminum-containing gray concrete and connected by fasteners 93. The bottom of the connecting seat 91 and the connecting block 92 are embedded in the aluminum-containing gray concrete layer 6 and welded to the reinforcing steel skeleton 5.

[0052] In the operation of the prefabricated sewage treatment device disclosed in this application, the flocculation tank 1, the first sedimentation tank 2, and the second sedimentation tank 3 are constructed in the factory using 3D printing technology and transported to the working position by means of shipping. The device is then hoisted by a crane using pre-embedded lifting rings 8 and moved to the preset position. Different components are assembled with connecting seats 91 and connecting blocks 92, and two components are connected into a whole by fasteners 93 (e.g., bolts). When a component of the flocculation tank 1, the first sedimentation tank 2, and the second sedimentation tank 3 loses its original function, the malfunctioning component can be replaced by disassembling and assembling the fasteners 93 and hoisting, so that the whole device can resume operation.

[0053] More preferably, such as Figure 1 As shown, the flocculation tank 1, the first sedimentation tank 2 and the second sedimentation tank 3 can be arranged in multiple groups side by side, and adjacent groups are connected by connecting members 9.

[0054] Example 2 This embodiment provides a method for preparing aluminum-containing gray concrete, and the prepared aluminum-containing gray concrete can be used to prepare the aluminum-containing gray concrete layer described in Example 1.

[0055] Including the following steps: S1: Grind and deoxidize the aluminum ash, place the deoxidized aluminum ash in an alkaline solution, add Ca(OH)2 solution and hydrolyze at 95℃ for 3 h, and separate the solid and liquid substances after the reaction to obtain aluminum ash treated material. S2: Add 75-90 parts of silicate cement, 120 parts of medium sand, 30 parts of fly ash, and 0-15 parts of aluminum ash treatment material to a cement paste mixer and mix thoroughly to obtain powdered cement-based material. S3: Add 34.2 parts water, 0.585 parts water-reducing agent polycarboxylic acid, 0.045 parts water-retaining agent cellulose ether, 0.045 parts defoamer higher alcohol and 0.045 parts latex powder, and stir evenly with a magnetic stirrer to obtain a mixed aqueous solution; S4: Slowly add the mixed aqueous solution to the powdered cement-based material and mix evenly to obtain a printing paste. Slowly add 0.09 parts of epoxy resin binder to the printing paste to obtain 3D printed concrete material.

[0056] Table 1 shows the compressive strength of concrete obtained in experimental cases with 120 parts medium sand and 30 parts fly ash, using silicate cement and alumina ash treatment materials as variables.

[0057] Example 3 This embodiment provides a method for preparing aluminum-containing gray concrete, and the prepared aluminum-containing gray concrete can be used to prepare the aluminum-containing gray concrete layer described in Example 1.

[0058] Including the following steps: S1: Grind and deoxidize the aluminum ash, place the deoxidized aluminum ash in an alkaline solution, add Ca(OH)2 solution and hydrolyze at 95℃ for 3 h, and separate the solid and liquid substances after the reaction to obtain aluminum ash treated material. S2: Add 85-100 parts of silicate cement, 100 parts of medium sand, 20 parts of fly ash, and 0-15 parts of aluminum ash treatment material to a cement paste mixer and mix thoroughly to obtain powdered cement-based material. S3: Add 38 parts water, 0.65 parts water-reducing agent polycarboxylic acid, 0.05 parts water-retaining agent cellulose ether, 0.05 parts defoamer higher alcohol and 0.05 parts latex powder, and stir evenly with a magnetic stirrer to obtain a mixed aqueous solution; S4: Slowly add the mixed aqueous solution to the powdered cement-based material and mix evenly to obtain a printing paste. Slowly add 0.1 parts of epoxy resin binder to the printing paste to obtain 3D printed concrete material.

[0059] Table 2 shows the compressive strength of concrete obtained in experimental cases with 100 parts medium sand and 20 parts fly ash, using silicate cement and alumina ash treatment materials as variables.

[0060] Example 4 This embodiment provides a method for preparing aluminum-containing gray concrete, and the prepared aluminum-containing gray concrete can be used to prepare the aluminum-containing gray concrete layer described in Example 1.

[0061] Including the following steps: S1: Grind and deoxidize the aluminum ash, place the deoxidized aluminum ash in an alkaline solution, add Ca(OH)2 solution and hydrolyze at 95℃ for 3 h, and separate the solid and liquid substances after the reaction to obtain aluminum ash treated material. S2: Add 95-110 parts of silicate cement, 90 parts of medium sand, 10 parts of fly ash, and 0-15 parts of aluminum ash treatment material to a cement paste mixer and mix thoroughly to obtain powdered cement-based material. S3: Add 41.8 parts of water, 0.72 parts of water-reducing agent polycarboxylic acid, 0.055 parts of water-retaining agent cellulose ether, 0.055 parts of defoamer higher alcohol and 0.055 parts of latex powder, and stir evenly with a magnetic stirrer to obtain a mixed aqueous solution; S4: Slowly add the mixed aqueous solution to the powdered cement-based material and mix evenly to obtain a printing paste. Slowly add 0.11 parts of epoxy resin binder to the printing paste to obtain 3D printed concrete material.

[0062] Table 3 shows the compressive strength of concrete obtained in experimental examples with 90 parts medium sand and 10 parts fly ash, using silicate cement and alumina ash treatment materials as variables.

[0063] The compressive strength data shown in Tables 1, 2, and 3 are based on tests conducted according to GB 50081-2019, "Standard for Test Methods of Physical and Mechanical Properties of Concrete." When the proportions of other materials are as shown above, the compressive strength of the concrete decreases rapidly with increasing aluminum ash content after exceeding 10 parts. Therefore, the preferred amount of aluminum ash used is no more than 10 parts. Furthermore, aluminum ash can suppress early hydration heat release in concrete cementitious materials during preparation, reducing the risk of concrete cracking. Insufficient aluminum ash usage negates the purpose of using it in concrete production; therefore, the preferred amount is no less than 5 parts. Analysis of the experimental examples also revealed a more preferred concrete printing material. Add 90-105 parts of silicate cement, 90-100 parts of medium sand, 10-20 parts of fly ash, and 5-10 parts of aluminum ash treatment material to a cement paste mixer and mix thoroughly to obtain powdered cement-based material. Add 38-41.8 parts of water, 0.65-0.72 parts of water-reducing agent polycarboxylate, 0.05-0.055 parts of water-retaining agent cellulose ether, 0.05-0.055 parts of defoamer high carbon alcohol, and 0.05-0.055 parts of latex powder, and mix thoroughly with a magnetic stirrer to obtain a mixed aqueous solution. Slowly add the mixed aqueous solution to the powdered cement-based material and mix thoroughly to obtain printing paste. Slowly add 0.1-0.11 parts of epoxy resin binder to the printing paste to obtain 3D printed concrete material.

[0064] Example 5 This example provides a method for preparing polyaluminum chloride powder using aluminum ash. The prepared polyaluminum chloride powder can be used to subsequently prepare wastewater treatment materials containing aluminum ash.

[0065] Including the following steps: X11: Weigh 10 parts aluminum ash, add 20-40 parts deionized water, mix well, then add 30 parts 33% hydrochloric acid, and seal the beaker; X12: Place the beaker in a magnetically stirred water bath and maintain the temperature at 70°C for 3 hours. Then cool to room temperature. X13: Seal the reacted solution and place it in an oven to mature at 60°C for 36 h, then filter to obtain the PAC solution; X14: Place the solution in a constant temperature drying oven and dry at 180℃ for 2 h. Grind the solution to obtain polyaluminum chloride powder.

[0066] Table 4 shows the alumina mass fraction and basicity of polyaluminum chloride powder obtained from the experimental example with deionized water as the variable.

[0067] The alumina mass fraction and basicity data shown in Table 4 were tested according to GB 15892-2020 "Polyaluminum Chloride for Drinking Water". The test results show that as the amount of deionized water increases, the alumina mass fraction in the prepared polyaluminum chloride powder increases, while the basicity decreases, especially when the amount of deionized water is changed from 30 parts to 40 parts. To balance the alumina mass fraction and basicity, the amount of deionized water used in Example 24 is preferred.

[0068] Example 6 The other steps are the same as in Example 5, except that the reaction temperature is changed from 70°C to 60°C using the deionized water content of Example 24.

[0069] Example 7 The other steps are the same as in Example 5, except that the reaction temperature is changed from 70°C to 80°C using the deionized water content of Example 24.

[0070] Example 8 The other steps are the same as in Example 5, except that the aging temperature is changed from 60°C to 50°C using the deionized water content of Example 24.

[0071] Example 9 The other steps are the same as in Example 5, except that the aging temperature is changed from 60°C to 70°C using the deionized water content of Example 24.

[0072] Example 10 The other steps are the same as in Example 5, except that the reaction time of 3 h is changed to 2.5 h using the deionized water content of Example 24.

[0073] Example 11 The other steps are the same as in Example 5, except that the reaction time of 3 h is changed to 3.5 h using the deionized water content of Example 24.

[0074] Example 12 The other steps are the same as in Example 5, except that the maturation time of 36 h is changed to 24 h using the deionized water content of Example 24.

[0075] Example 13 The other steps are the same as in Example 5, except that the time is changed from 36 h to 48 h using the deionized water content of Example 24.

[0076] Table 5 shows the alumina mass fraction and basicity data in the polyaluminum chloride powder of Examples 6-13.

[0077] The alumina mass fraction and basicity data shown in Table 5 were tested according to GB 15892-2020 "Polyaluminum Chloride for Drinking Water". The test results show that with increasing reaction temperature, the alumina content and basicity of polyaluminum chloride exhibit a trend of first increasing and then decreasing. This may be because if the reaction temperature is too low, the polymerization reaction will be incomplete, while if the reaction temperature is too high, it will destroy the polymer structure and lead to polymer decomposition. Therefore, the preferred reaction temperature is 70℃. With increasing aging temperature, the alumina content and basicity of polyaluminum chloride also show a trend of first increasing and then decreasing. This may be because with increased aging temperature, some hydrochloric acid volatilizes. Therefore, the preferred aging temperature is 60℃. With increasing reaction time and aging time, both the alumina content and basicity of polyaluminum chloride increase. However, considering the requirements of the actual process, the preferred reaction time is 3 h and the preferred aging time is 36 h.

[0078] Example 14 The method for preparing copper oxide-loaded oyster shell powder provided in this example can be used to prepare wastewater treatment materials containing aluminum ash.

[0079] Including the following steps: Five parts of oyster shell powder were soaked in 100 parts of (0.0625 mol / L) Cu(NO3)23H2O solution and magnetically stirred at room temperature for 6 h. After filtration, the filtered material was placed in a constant temperature drying oven and dried at 70 ℃ for 4 h. After removal, it was washed five times with deionized water and anhydrous ethanol and calcined in a muffle furnace at 500 ℃ for 2 h. After removal and grinding, copper oxide-loaded oyster shells were obtained.

[0080] Example 15 The other steps are the same as in Example 14, except that the concentration of 5 portions of oyster shell powder soaked in 100 ml (0.0625 mol / L) Cu(NO3)23H2O solution is changed from 0.0625 mol / L to 0.125 mol / L.

[0081] Example 16 The other steps are the same as in Example 14, except that the concentration of 5 portions of oyster shell powder soaked in 100 ml (0.0625 mol / L) Cu(NO3)23H2O solution is changed from 0.0625 mol / L to 0.1875 mol / L.

[0082] Example 17 The other steps are the same as in Example 14, except that the concentration of 5 portions of oyster shell powder soaked in 100 ml (0.0625 mol / L) Cu(NO3)23H2O solution is changed from 0.0625 mol / L to 0.25 mol / L.

[0083] Example 18 The other steps are the same as in Example 14, except that the concentration of 5 portions of oyster shell powder soaked in 100 ml (0.0625 mol / L) Cu(NO3)23H2O solution is changed from 0.0625 mol / L to 0.3125 mol / L.

[0084] Table 6 shows the antibacterial effect data of copper oxide-loaded oyster shell powder in Examples 14-18.

[0085] Table 6 shows the Escherichia coli antibacterial effect data, which were tested according to GB / T 21510-2008 "Test Method for Antibacterial Properties of Nano-Inorganic Materials". The results show that the antibacterial effect of the copper oxide-loaded oyster shell powder on Escherichia coli improves with increasing Cu(NO3)23H2O solution concentration. Meanwhile, the antibacterial effect in Example 14 was poor. Further increasing the Cu(NO3)23H2O solution concentration after Example 17 did not significantly improve the antibacterial effect of the copper oxide-loaded oyster shell powder on Escherichia coli. Therefore, soaking 5 parts of oyster shell powder in 100 parts (0.1875-0.25 mol / L) Cu(NO3)23H2O solution is the optimal solution for preparing copper oxide-loaded oyster shell powder.

[0086] Example 19 The method for preparing the aluminum-containing wastewater treatment material provided in this embodiment can be used to prepare the wastewater treatment solution in Example 1 after adding water.

[0087] Including the following steps: Weigh 10 parts of polyaluminum chloride (the preparation method of polyaluminum chloride is the product obtained in Experiment 24 of Example 5), 0 parts of polyacrylamide, and 0 parts of copper oxide-loaded oyster shell powder (the preparation method of copper oxide-loaded oyster shell powder is the product obtained in Example 16). Stir magnetically for 4 hours and let stand for 30 minutes. Place in a constant temperature drying oven and dry at 70°C to constant weight. Remove and let stand to cool to obtain polyaluminum chloride-polyacrylamide-copper oxide-oyster shell composite material (PAC-PAM-CuO-Os).

[0088] Example 20 The other steps differ from those in Example 19 except that the amount of polyacrylamide is changed from 0 parts to 0.1 parts.

[0089] Example 21 The other steps differ from those in Example 19 except that the amount of polyacrylamide is changed from 0 parts to 0.2 parts.

[0090] Example 22 The other steps differ from those in Example 19 except that the amount of polyacrylamide is changed from 0 parts to 0.5 parts.

[0091] Example 23 The other steps differ from those in Example 19 except that the amount of polyacrylamide is changed from 0 parts to 1 part.

[0092] Example 24 The other steps differ from those in Example 19 except that the amount of polyacrylamide is changed from 0 parts to 0.1 parts, and the amount of copper oxide-loaded oyster shell powder is changed from 0 parts to 5 parts.

[0093] Example 25 The other steps differ from those in Example 19 except that the amount of polyacrylamide is changed from 0 parts to 0.1 parts, and the amount of copper oxide-loaded oyster shell powder is changed from 0 parts to 10 parts.

[0094] Example 26 The other steps differ from those in Example 19 except that the amount of polyacrylamide is changed from 0 parts to 0.1 parts, and the amount of copper oxide-loaded oyster shell powder is changed from 0 parts to 20 parts.

[0095] Example 27 The other steps differ from those in Example 19 except that the amount of polyacrylamide is changed from 0 parts to 0.1 parts, and the amount of copper oxide-loaded oyster shell powder is changed from 0 parts to 40 parts.

[0096] Example 28 The other steps differ from those in Example 19 except that the amount of polyacrylamide is changed from 0 parts to 0.1 parts, and the amount of copper oxide-loaded oyster shell powder is changed from 0 parts to 60 parts.

[0097] Example 29 The other steps differ from those in Example 19 except that the amount of polyacrylamide is changed from 0 parts to 0.1 parts, and the amount of copper oxide-loaded oyster shell powder is changed from 0 parts to 80 parts.

[0098] Table 7 shows the turbidity removal rate and antibacterial effect data of the polyaluminum chloride-polyacrylamide-copper oxide-oyster shell composite materials in Examples 19-29.

[0099] Table 7 shows the Escherichia coli antibacterial effect data, which were tested according to GB / T 21510-2008 "Test Method for Antibacterial Performance of Nano-Inorganic Materials". Turbidity removal rate data were tested using a portable turbidimeter. The results show that adding polyacrylamide effectively improves the turbidity removal rate. This is likely because polyacrylamide, as a high-molecular-weight polymer, can enhance the charge neutralization effect of polyaluminum chloride, thereby improving the removal efficiency of suspended solids in water. However, as the amount of polyacrylamide added increases, the turbidity removal rate decreases. This may be because polyacrylamide forms excessive bridges between particles, resulting in overly large flocs with a loose structure, thus reducing the turbidity removal rate. Adding copper oxide-loaded oyster shell powder to polyaluminum chloride (PAC) resulted in a decrease in turbidity removal rate and an increase in Escherichia coli inhibition rate of the PAC-polyacrylamide-copper oxide-oyster shell composite material with increasing addition amount. Therefore, considering the overall wastewater treatment effect of the PAC-polyacrylamide-copper oxide-oyster shell composite material, the PAC-polyacrylamide-copper oxide-oyster shell composite material prepared by adding 0.1-0.2 parts of polyacrylamide and 40-60 parts of copper oxide-loaded oyster shell powder is the optimal solution.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A prefabricated sewage treatment device, characterized in that, It includes a flocculation tank, a first sedimentation tank, a second sedimentation tank, and a feeding device; The flocculation tank, the first sedimentation tank, and the second sedimentation tank are arranged in sequence and connected. The wastewater to be treated passes through the flocculation tank, the first sedimentation tank, and the second sedimentation tank in sequence to complete the flocculation and sedimentation treatment. The flocculation tank, the first sedimentation tank and the second sedimentation tank all include a steel frame and an aluminum-containing gray concrete layer; The feeding device is connected to the flocculation tank through a pipeline. The wastewater treatment liquid stored in the feeding device enters the flocculation tank from the top of the flocculation tank through the pipeline and mixes with the wastewater to be treated and flocculates. The wastewater treatment solution is obtained by dissolving wastewater treatment materials containing aluminum ash in water; The flocculation tank includes a flocculation inlet, a flocculation outlet, a turbulence-inducing component, and a flocculation flow channel; The flocculation inlet and the flocculation outlet are located on both sides of the flocculation tank and are used for the inlet and outlet of sewage, respectively. The flocculation channel is located in the flocculation tank to guide the flow of sewage and create disturbances during the flow, thereby improving flocculation efficiency. The turbulence-inducing components are disposed between the flocculation channels to generate vortices during the flow of sewage, thereby increasing turbulent kinetic energy and turbulent kinetic energy dissipation rate and thus improving the flocculation effect. The flocculation channel includes an inlet channel and a cross channel; The inlet channel includes a first horizontal section, a first arc-shaped section, a first vertical section, a second arc-shaped section, and a third arc-shaped section; The first horizontal section is connected to the wall above the inlet of the flocculation tank; The end of the first horizontal section away from the upper part of the wall above the inlet of the flocculation tank is connected to the first arc-shaped section; The first arc segment and the second arc segment are connected by the first vertical segment; The first arc-shaped segment, the first vertical segment, and the second arc-shaped segment together form a U-shaped structure, and the opening direction of the U-shaped structure is opposite to the inlet direction of the flocculation tank. The third arc segment is located at the end of the second arc segment away from the first vertical segment, and tends to be away from the side wall of the flocculation inlet. Multiple staggered flow channels are provided in the flocculation tank; The ends of the interlaced flow channels are connected to the top or bottom wall of the flocculation tank through vertical flow channels. That is, after a certain interlaced flow channel is connected to the top wall, its adjacent interlaced flow channel is connected to the bottom wall. The interlaced flow channels have an S-shaped wave structure. The S-shaped wave structures of two adjacent interlaced flow channels are arranged in a non-parallel manner, that is, there are cavities formed by mutual distance and narrow passages formed by mutual proximity between two adjacent interlaced flow channels. The flow-disrupting component is disposed in the cavity; The first sedimentation tank includes a first sedimentation inlet, a first sedimentation outlet, and a first sedimentation flow channel; The first sedimentation channel includes a receiving channel, a T-shaped channel, and an L-shaped channel; One end of the receiving channel is located on the side wall below the first sedimentation inlet, and the other end is a free end, used to receive the fluid flowing out of the flocculation tank; The T-shaped flow channel includes a second vertical section, a second horizontal section, and a first convex section; The upper end of the second vertical section is connected to the top wall of the first sedimentation tank, and the other end is connected to the second horizontal section; The connection between the second vertical segment and the second horizontal segment has an arc-shaped chamfered structure; The distance between the inlet channel and the second horizontal section is the same as the distance between the second horizontal section and the bottom wall of the first sedimentation tank; The first convex section is located at the end of the second horizontal section away from the first sedimentation inlet; The height of the first convex section is higher than the height of the second horizontal section; The lower end face of the first convex section is on the same horizontal plane as the lower end face of the second horizontal section; The upper end face of the first convex section and the upper end face of the second horizontal section have an arc-shaped chamfer structure; The L-shaped flow channel includes a third vertical section, a third horizontal section, a fourth arc-shaped section, and a fourth horizontal section; The lower end of the third vertical section is connected to the bottom wall of the first sedimentation tank; The third horizontal segment is connected to the side of the third vertical segment; The fourth arc segment is connected to the end of the third horizontal segment away from the third vertical segment, and the other end of the fourth arc segment is connected to the fourth horizontal segment.

2. The prefabricated sewage treatment device according to claim 1, characterized in that, The first sedimentation inlet and the first sedimentation outlet are located on both sides of the first sedimentation tank and are used for the inflow and outflow of sewage, respectively. The first sedimentation inlet and the flocculation outlet are arranged opposite to each other; The first sedimentation channel is located in the first sedimentation tank to reduce eddies in the fluid, increase the fluid's travel distance, and settle large particulate impurities in the fluid.

3. The prefabricated sewage treatment device according to claim 1, characterized in that, The second sedimentation tank includes a second sedimentation inlet, a second sedimentation outlet, and a second sedimentation flow channel; The second sedimentation inlet and the second sedimentation outlet are located on both sides of the second sedimentation tank and are used for the inlet and outlet of sewage, respectively. The second sedimentation inlet and the first sedimentation outlet are positioned opposite each other; The second sedimentation channel is located in the second sedimentation tank and is used to settle particulate impurities in the fluid.

4. The prefabricated sewage treatment device according to claim 1, characterized in that, It also includes wastewater detection devices; The wastewater detection device is installed on the upper side wall of the first sedimentation outlet and the lower side wall of the second sedimentation outlet, and is used to monitor the pollutant content of the fluid.

5. The prefabricated sewage treatment device according to claim 1, characterized in that, It also includes lifting rings and connecting components; Multiple lifting rings are provided on the flocculation tank, the first sedimentation tank, and the second sedimentation tank; The upper end of the lifting ring is exposed above the aluminum-containing gray concrete layer, and the lower end of the lifting ring is embedded in the aluminum-containing gray concrete layer and tied to the steel reinforcement skeleton. The connecting component includes a connecting seat and a connecting block; The connecting seat and the connecting block are arranged in pairs at corresponding positions on the top of two adjacent tanks of the flocculation tank, the first sedimentation tank and the second sedimentation tank; The upper parts of the connecting seat and the connecting block are exposed above the aluminum-containing gray concrete and connected by fasteners. The bottom of the connecting seat and the connecting block are embedded in the aluminum-containing gray concrete layer and welded to the reinforcing steel skeleton.

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