Integrated wastewater pretreatment device

Abstract

The utility model discloses an integrated wastewater pretreatment device which comprises a main body with a tank body structure, and the interior of the main body is divided into a reaction tank group, a precipitation tank and a clear liquid collecting tank through two separation vertical plates, so that wastewater is effectively treated at different stages. A stirring device is arranged at the top of the reaction tank group to stir wastewater and additives, so that uniform treatment of pollutants is realized, and the reaction efficiency is maximized. An overflow tank is arranged at the top of the precipitation tank and used for collecting clear liquid and guiding the clear liquid into a clear liquid collecting tank through a clear liquid outlet, a clear liquid discharging opening is formed in the clear liquid collecting tank and used for discharging the treated clear liquid from the clear liquid collecting tank, and in addition, a sludge pump is installed at the bottom of the main body and used for pumping precipitated sludge in the precipitation tank. The utility model aims to provide the efficient wastewater pretreatment device which is compact in structure and simple and convenient to operate, divides the wastewater treatment process into three stages of reaction, precipitation and clear liquid collection, is small in occupied area and convenient to move, and can cope with common problems in industrial wastewater treatment.

Description

Technical Field

[0001] The utility model relates to the field of wastewater treatment, in particular to an integrated wastewater pretreatment device. Background Art

[0002] Acidic and alkaline wastewater usually contains a large amount of pollutants, such as particulate matter, inorganic acids (such as sulfuric acid, hydrochloric acid), heavy metals and organic matter.

[0003] Particulate matter in industrial acidic and alkaline wastewater not only affects water clarity but may also carry heavy metals and organic matter, further degrading water quality. Inorganic acids (such as sulfuric and hydrochloric acids) significantly lower the pH of water, leading to acidification, damaging aquatic ecosystems, and impacting biodiversity. Heavy metals such as lead, cadmium, and mercury are bioaccumulative, gradually accumulating in organisms through the food chain and posing a threat to human health. Furthermore, organic substances such as solvents, petroleum-based substances, and chemical reagents are difficult to degrade in the environment.

[0004] If these pollutants are discharged untreated, the inorganic acids and heavy metals will acidify the water and increase its toxicity, affecting the survival of aquatic plants and animals and potentially causing mass mortality of fish and other aquatic life. Acidified water can also seep into groundwater systems, threatening agricultural irrigation and residential water safety.

[0005] However, while existing wastewater treatment technologies can address the pollution issues associated with acidic and alkaline wastewater to a certain extent, many problems remain in their practical application. Traditional wastewater treatment equipment often requires large areas of land, which presents a significant challenge in industrial and urban environments where land resources are limited. Furthermore, the construction and installation of these devices typically take a long time, leading to project delays and impacting the normal production operations of enterprises. The large footprint of these devices makes them more complex to operate, which not only increases the difficulty of operation and maintenance but also raises management costs. More importantly, the high cost of these systems places significant financial pressure on many small and medium-sized enterprises in wastewater treatment, limiting their ability to implement effective environmental protection measures.

[0006] Therefore, the existing wastewater pH adjustment and sludge sedimentation systems need to be further optimized and improved. Utility Model Content

[0007] The purpose of the utility model is to provide an integrated wastewater pretreatment device which occupies a small area, is simple to construct, is easy to operate and has controllable costs.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following scheme: an integrated wastewater pretreatment device, comprising:

[0009] The main body is a tank structure, and the interior is divided into a reaction tank group, a sedimentation tank and a clear liquid collection tank from left to right by two partition plates standing apart at intervals. The reaction tank group is connected to the sedimentation tank;

[0010] A stirring device, mounted on top of each of the reaction tanks, is used to agitate the wastewater within the reaction tanks. This device thoroughly mixes the wastewater and additives, ensuring uniform treatment of pollutants in the wastewater and maximizing reaction efficiency. Furthermore, the top-mounted design facilitates equipment maintenance and reduces contact between the agitator and sediment, reducing wear.

[0011] An overflow trough is mounted between the two partition plates near the top of the sedimentation tank, with an open top for collecting the clear liquid in the sedimentation tank. One end of the overflow trough is provided with a clear liquid outlet, which is connected to the clear liquid collecting tank to direct the collected clear liquid into the clear liquid collecting tank.

[0012] a clear liquid discharge port, which is arranged on the side wall of the main body near the top and is connected to the clear liquid collecting tank for discharging clear liquid;

[0013] A sludge pump is installed at the bottom of the main body and is used to pump out the settled sludge in the sedimentation tank.

[0014] By dividing the main body into a reaction tank group, a sedimentation tank, and a clear liquid collection tank, wastewater is treated in stages. Reactions occur in the reaction tank group, followed by solid-liquid separation in the sedimentation tank, and finally, the clear liquid is collected in the clear liquid collection tank. This design not only optimizes the treatment process but also effectively separates sludge and clear liquid, reducing secondary pollution.

[0015] As a further solution of the present invention, the reaction pool group includes reaction pool A, reaction pool B and reaction pool C arranged in sequence on the left side of the sedimentation tank, the stirring device is respectively installed on the top of reaction pool A, reaction pool B and reaction pool C through a mounting frame, and the stirring shaft of the stirring device extends into reaction pool A, reaction pool B and reaction pool C respectively, the reaction pool A, reaction pool B and reaction pool C are connected by a first connecting port, and the reaction pool C is connected to the sedimentation tank through a second connecting port. By dividing the reaction pool into multiple independent pools, different chemical reactions can be carried out in stages, thereby improving the effect of wastewater treatment and the accuracy of reaction control. In addition, the design of the first connecting port ensures that wastewater flows smoothly between different reaction pools to avoid flow resistance.

[0016] As a preferred embodiment of the present invention, the stirring device includes a reducer mounted on the top of each of reaction tanks A, B, and C, and a motor connected to the reducer to drive the reducer. The stirring shaft is fixed to the rotating shaft of the corresponding reducer and is provided with a stirring blade. Using the reducer and motor to drive the stirring shaft ensures that the stirring device operates at an appropriate speed and force, avoiding excessive or insufficient stirring, thereby improving reaction efficiency and extending the life of the equipment.

[0017] As a further solution of the present invention, the height of the second connecting port is not lower than the top height of the overflow trough. This height design ensures a reasonable flow path of wastewater in the system, avoids sediment from entering the clear liquid collection area, and ensures that the clear liquid can be discharged smoothly without causing clear liquid backflow or mixing with sediment due to liquid level problems. The height of the clear liquid discharge port is lower than the height of the clear liquid outlet. The position design of the clear liquid discharge port facilitates the rapid discharge of the treated clear liquid from the system, while preventing the sludge deposited at the bottom from being discharged, thereby keeping the discharged clear liquid pure.

[0018] As a preferred solution of the present invention, a drain pipe is provided at the bottom of the clear liquid collection tank, and a first valve is provided on the drain pipe. The design of the drain pipe facilitates rapid draining of the liquid in the clear liquid collection tank during system maintenance, simplifying cleaning and maintenance operations.

[0019] As a preferred embodiment of the present invention, defoaming teeth are provided along the top edges of the left and right side walls of the overflow trough. The defoaming teeth are designed to effectively reduce bubbles in the clear liquid, preventing splashing or foaming caused by bubbles from interfering with the flow of the clear liquid into the overflow trough, thereby improving the purity and collection efficiency of the clear liquid.

[0020] As a preferred solution of the present invention, a plurality of legs are provided at the bottom of the main body to prevent the equipment from tilting or shifting due to uneven ground or vibration, thereby ensuring the safety and stability of the equipment operation.

[0021] As a preferred embodiment of the present invention, the bottom of the sedimentation tank is in the shape of a concave inverted trapezoid, and the sludge pump is connected to the bottom of the sedimentation tank. The sludge pump is directly connected to the bottom of the sedimentation tank, which can efficiently pump out the settled sludge and reduce the frequency of cleaning the sedimentation tank. The inverted trapezoidal design helps to concentrate the settled sludge, making it easier for the sludge pump to pump it out, reducing the sludge retention time in the sedimentation tank, preventing sediment accumulation, and keeping the sedimentation tank clean and operating efficiently.

[0022] As a further solution of the present invention, the first communication ports are respectively arranged at a position near the top of the partition between the reaction tank A and the reaction tank B, and at a position near the bottom of the partition between the reaction tank B and the reaction tank C. The position design of the first communication ports can control the flow path of the wastewater between the different reaction tanks. The first communication port located at the top facilitates the overflow of the wastewater, while the first communication port located at the bottom facilitates the flow of liquid at the bottom layer, thereby ensuring sufficient reaction and precipitation of the wastewater within the system.

[0023] As a preferred embodiment of the present invention, the second communication port is disposed on the partition plate corresponding to the reaction tank C, near the top of the partition plate. This location of the second communication port allows for more precise control of the wastewater level in the reaction tank C, preventing sediment from flowing from the overflow tank into the next treatment stage. It also ensures that the reacted wastewater flows smoothly into the sedimentation tank, achieving a good separation effect.

[0024] In summary, the present invention offers the following advantages over the prior art: The present invention, through its compartmentalized design, divides the wastewater treatment process into three stages: reaction, sedimentation, and clear liquid collection, optimizing the wastewater treatment process. The provision of a stirring device ensures thorough mixing of wastewater and additives, improving reaction efficiency. The interconnected design of the overflow tank and the clear liquid collection tank simplifies the clear liquid collection and discharge process, ensuring the purity of the clear liquid. The bottom-mounted sludge pump allows for rapid extraction of settled sludge, reducing the frequency of equipment cleaning. The multi-tank structure of the reaction tank group optimizes the wastewater flow path through the first connecting ports at different heights, ensuring treatment effectiveness at each stage. The height settings of the clear liquid discharge port and the second connecting port achieve excellent separation. The support legs at the bottom of the device ensure stability, while the inverted trapezoidal design of the sedimentation tank bottom concentrates the sludge and facilitates its removal. Combined with these designs, the present invention forms a compact, easy-to-operate, and efficient wastewater pretreatment device. It occupies a small footprint, is easily movable, and can address common issues in industrial wastewater treatment, significantly improving treatment effectiveness and economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is one of the three-dimensional views of the present invention.

[0026] Figure 2 This is the second three-dimensional view of the present invention.

[0027] Figure 3 This is a top view of the present invention.

[0028] Figure 4 This is one of the cross-sectional views of the present invention.

[0029] Figure 5 This is the second cross-sectional view of the present invention.

[0030] Explanation of the accompanying symbols: 1. Main body; 2. Reaction tank group; 3. Sedimentation tank; 4. Clear liquid collecting tank; 5. Stirring device; 6. Overflow tank; 7. Sludge pump; 8. Support leg; 11. Partitioning plate; 21. Reaction tank A; 22. Reaction tank B; 23. Reaction tank C; 24. First connecting port; 25. Second connecting port; 40. Clear liquid discharge port; 41. Emptying pipe; 42. First valve; 51. Mounting frame; 52. Stirring shaft; 53. Reducer; 54. Motor; 55. Stirring blade; 61. Clear liquid outlet; 62. Defoaming teeth. DETAILED DESCRIPTION

[0031] The following detailed description provides various embodiments or examples for implementing the present invention. These are, of course, merely examples and are not intended to be limiting. Furthermore, repeated reference numerals, such as repeated numbers and / or letters, may be used in different embodiments. Such repetition is for simplicity and clarity in describing the present invention and does not imply a specific relationship between the various embodiments and / or configurations discussed.

[0032] In addition, spatially related terms may be used, such as "below," "lower side," "from the inside out," "above," "upper side," and similar terms. These terms are used to facilitate the description of the relationship between one element or feature and another element or feature in the drawings. These spatially related terms include different orientations of the device in use or operation, as well as the orientations described in the drawings. The device may be turned to different orientations, rotated 90 degrees or other orientations, and the spatially related adjectives used therein may also be interpreted in the same way. Therefore, they cannot be understood as limiting the present invention. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Figures 1 to 5 The integrated wastewater pretreatment device shown in the figure includes a main body 1, a stirring device 5, an overflow tank 6, a clear liquid discharge port 40, a sludge pump 7, and other major components. Through structural design and process optimization, the device achieves efficient wastewater pretreatment with a small footprint and convenient operation. The details are as follows:

[0034] The main body 1 is a tank structure with multiple legs 8 at the bottom. Its interior is divided into a reaction tank group 2, a sedimentation tank 3, and a clear liquid collection tank 4 by two partition panels 11. The reaction tank group 2 is used for the full reaction of wastewater and additives, the sedimentation tank 3 is used for solid-liquid separation, and the clear liquid collection tank 4 is used to collect the treated clear liquid.

[0035] In the reaction tank group 2, a stirring device 5 is provided. Each stirring device 5 is fixed to the top of the corresponding reaction tank by a mounting bracket 51. The stirring shaft 52 extends into the tank to fully mix the wastewater and the additive to ensure the uniformity of the reaction. The stirring device is driven by a reducer 53 and a motor 54. The stirring shaft 52 is equipped with a stirring blade 55, which stirs at an appropriate speed and force to avoid excessive stirring and causing equipment wear. Specifically: the reaction tank group 2 is divided into reaction tank A21, reaction tank B22 and reaction tank C23, which are connected in sequence through the first connecting port 24, and the wastewater undergoes different chemical reactions in each tank. The formation reaction of calcium fluoride and magnesium hydroxide is carried out in reaction tank A21, calcium carbonate precipitate is generated in reaction tank B22, and coagulation precipitation is carried out in reaction tank C23. The mounting frame 51 spans the top of the reaction tank A21, the reaction tank B22 and the reaction tank C23. A stirring device 5 consisting of a reducer 53, a motor 54 and a stirring blade 55 is installed in each corresponding reaction tank A21, the reaction tank B22 and the reaction tank C23 to stir the wastewater and the added reagents in each reaction tank.

[0036] The wastewater after treatment in the reaction tank C23 enters the sedimentation tank 3 through the second connecting port 25. The bottom of the sedimentation tank 3 is designed in an inverted trapezoidal shape, which is conducive to the centralized collection of sludge. The sludge is pumped out for filter pressing treatment through the sludge pump 7 installed at the bottom of the main body 1.

[0037] The overflow trough 6 is installed near the top of the sedimentation tank 3, with its top open. The clear liquid after solid-liquid separation in the sedimentation tank 3 gradually overflows into the overflow trough 6, enters the clear liquid collection tank 4 through the clear liquid outlet 61, and is then directed to subsequent processing equipment through the clear liquid discharge port 40. The top edge of the overflow trough 6 is equipped with defoaming teeth 62 to prevent bubbles from interfering with the flow of the clear liquid. It should be noted that the clear liquid outlet 61 extends through the partition plate 11 that forms the clear liquid collection tank 4. The second communication port 25 is located on the partition plate 11 corresponding to the reaction cell C23, near the top of the partition plate 11. The height of the second communication port 25 is no less than the top height of the overflow trough 6, facilitating the smooth flow of clear liquid into the clear liquid collection tank 4. A drain pipe 41 is located at the bottom of the clear liquid collection tank 4 to facilitate rapid emptying of the liquid during system maintenance. This drain pipe 41 is equipped with a first valve 42 that allows for flexible control of the timing and frequency of draining.

[0038] Among them, Figure 1 and Figure 2 As shown, the clear liquid discharge port 40 is provided on the side wall of the main body 1 near the top. Moreover, the height of the clear liquid discharge port 40 is lower than the height of the clear liquid outlet 61 .

[0039] In addition, if Figure 5As shown, in order to optimize the flow path of the wastewater and ensure the treatment effect at each stage, the first connecting port 24 is respectively arranged at a position near the top of the partition between the reaction tank A21 and the reaction tank B22, and at a position near the bottom of the partition between the reaction tank B22 and the reaction tank C23.

[0040] In addition, in order to be able to efficiently extract the sludge settled in the sedimentation tank 3, the cleaning frequency of the sedimentation tank 3 is reduced. Figure 2 and Figure 4 as well as Figure 5 As shown in FIG, the bottom of the sedimentation tank 3 is in a concave inverted trapezoidal shape. The inverted trapezoidal design facilitates centralized sedimentation of sludge. The sludge pump 7 is connected to the bottom of the sedimentation tank 3, making it easier for the concentrated sedimented sludge to be pumped out by the sludge pump 7, reducing the retention time of the sludge in the sedimentation tank 3 and preventing the accumulation of sediment.

[0041] The process of this utility model is as follows: wastewater first enters reaction tank A21. At this stage, liquid caustic soda is added to the wastewater to raise its pH, and a CaCl2 solution is added. Through the action of the stirring device 5, fluoride ions in the wastewater react with calcium ions to form calcium fluoride precipitate, while magnesium ions react with hydroxide ions to form magnesium hydroxide. To ensure fluoride ion removal efficiency, the amount of CaCl2 added is controlled to an excess of 20%-30%. After sufficient reaction, the treated wastewater flows from the bottom of reaction tank A21 through the first connecting port 24 into reaction tank B22.

[0042] In reaction tank B22, NaCO and polyaluminium chloride (PAC) are added to the wastewater, causing calcium ions in the wastewater to react with carbonate ions to form calcium carbonate precipitate. The PAC accelerates the formation of flocculated precipitates. After the reaction is complete, the wastewater flows into reaction tank C23 through the first connecting port 24 at the top.

[0043] In the reaction tank C23, a coagulant aid, PAM, is added to the wastewater to further promote the coagulation and sedimentation reaction. The fully treated wastewater then enters the sedimentation tank 3 through the second connecting port 25. In the sedimentation tank 3, the sludge in the wastewater gradually settles to the bottom of the tank.

[0044] When the wastewater level rises to the top of the overflow tank 6, the clear liquid enters the overflow tank 6 through the gap of the defoaming teeth 62, and then flows into the clear liquid collection tank 4 through the clear liquid outlet 61. After the clear liquid is collected in the clear liquid collection tank 4, it is introduced into the evaporator through the clear liquid discharge port 40 for subsequent evaporation treatment.

[0045] The sludge at the bottom of the sedimentation tank 3 is pumped out by the sludge pump 7 and sent to the plate and frame filter press for filtration. The sludge after filtration is transported out for treatment, and the filtrate from the filtration is returned to the reaction tank A21 for further circulation.

[0046] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrative purposes. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated wastewater pretreatment device, characterized in that: Includes: The main body (1) is in a tank structure, and is divided into a reaction tank group (2), a sedimentation tank (3), and a clear liquid collection tank (4) from left to right by two partitioning vertical plates (11) standing apart from each other. The reaction tank group (2) is connected to the sedimentation tank (3); A stirring device (5), the stirring device (5) is respectively arranged on the top of the reaction tank group (2) and is used to stir the wastewater in the reaction tank group (2); An overflow trough (6), the overflow trough (6) being mounted between two partitioning vertical plates (11) near the top of the sedimentation tank (3), the top of which is open and used to collect the clear liquid in the sedimentation tank (3), and a clear liquid outlet (61) being provided at one end of the overflow trough (6), the clear liquid outlet (61) being connected to the clear liquid collecting tank (4), and the collected clear liquid being introduced into the clear liquid collecting tank (4); a clear liquid discharge port (40), the clear liquid discharge port (40) being arranged on a side wall of the main body (1) near the top and being connected to the clear liquid collecting tank (4) for discharging clear liquid; A sludge pump (7), the sludge pump (7) being installed at the bottom of the main body (1) and being used to pump out the settled sludge in the sedimentation tank (3); The reaction pool group (2) includes a reaction pool A (21), a reaction pool B (22) and a reaction pool C (23) which are sequentially arranged in parallel on the left side of the precipitation tank (3); the stirring device (5) is respectively installed on the top of the reaction pool A (21), the reaction pool B (22) and the reaction pool C (23) through a mounting frame (51); and the stirring shaft (52) of the stirring device (5) extends into the reaction pool A (21), the reaction pool B (22) and the reaction pool C (23) respectively; the reaction pool A (21), the reaction pool B (22) and the reaction pool C (23) are connected through a first connecting port (24); and the reaction pool C (23) is connected to the precipitation tank (3) through a second connecting port (25); The height of the second communication port (25) is not lower than the top height of the overflow trough (6), the height of the clear liquid discharge port (40) is lower than the height of the clear liquid outlet (61), and defoaming teeth (62) are provided along the top edges of the left and right side walls of the overflow trough (6); The bottom of the main body (1) is provided with a plurality of supporting legs (8), the bottom of the sedimentation tank (3) is in a concave inverted trapezoidal shape, and the sludge pump (7) is connected to the bottom of the sedimentation tank (3).

2. The integrated wastewater pretreatment device according to claim 1, characterized in that: The stirring device (5) includes a reducer (53) respectively installed on the top of the reaction tank A (21), the reaction tank B (22) and the reaction tank C (23), and a motor (54) connected to the reducer (53) and driving the reducer (53) to rotate. The stirring shaft (52) is fixed on the rotating shaft of the corresponding reducer (53), and a stirring blade (55) is provided on the stirring shaft (52).

3. The integrated wastewater pretreatment device according to claim 1, characterized in that: A drain pipe (41) is provided at the bottom of the clear liquid collecting tank (4), and a first valve (42) is provided on the drain pipe (41).

4. The integrated wastewater pretreatment device according to claim 1, characterized in that: The first communication port (24) is respectively arranged at a position close to the top of the partition between the reaction tank A (21) and the reaction tank B (22), and at a position close to the bottom of the partition between the reaction tank B (22) and the reaction tank C (23).

5. The integrated wastewater pretreatment device according to claim 1, characterized in that: The second communication port (25) is provided on the partition plate (11) corresponding to the reaction tank C (23) and is close to the top of the partition plate (11).

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