Water-based ink sewage treatment recycling mechanism

Abstract

The utility model relates to sewage treatment technical field discloses a kind of water-based ink sewage treatment recycling mechanism, including the pretreatment unit, chemical treatment unit, solid-liquid separation unit and filtrate reuse unit connected in sequence, the utility model uses the collaborative processing route of " pretreatment-chemical treatment-solid-liquid separation-filtrate reuse", in pretreatment unit, multilayer filter screen is cooperated with aeration tank, effectively removes large particle impurities and improves wastewater biodegradability, chemical treatment unit is removed through the continuous action of coagulation oxidation tank and flocculation tank, first through coagulant and oxidant make colloidal particles unstable and degrade colored substance, then through flocculant form thick dense alum flower, pollutant is removed thoroughly, finally high-pressure solid-liquid separation is carried out by plate-and-frame filter press, filtrate is clear, water quality is stable and reliable, fully meet the requirement of being used for production.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically a water-based ink wastewater treatment and recycling mechanism. Background Technology

[0002] The corrugated cardboard box production and printing industries generate a large amount of wastewater, which has poor biodegradability and causes significant environmental pollution. In order to meet environmental requirements, each company usually has its own wastewater treatment system to comprehensively treat the wastewater generated within the company. Currently, in wastewater treatment, the wastewater volume and dosage are usually calculated using flow rate. The product of flow rate and time determines the wastewater volume, and then the dosage is roughly calculated based on the volume. A PLC controls a pneumatic pump to extract the dosage. However, the above method has the following problems in actual use: the dosage is inaccurate, the treatment is crude, and the treated wastewater is either used for flushing toilets, watering green spaces, or directly discharged into the environment. Although it is reused, the utilization rate is low, and the economic benefits are low. For a company, ordinary wastewater treatment processes are still not economical, and the cost is relatively high. Utility Model Content

[0003] The purpose of this invention is to provide a water-based ink wastewater treatment and recycling mechanism, which has the advantages of good treatment effect and good effluent quality.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a water-based ink wastewater treatment and recycling mechanism, comprising a pretreatment unit, a chemical treatment unit, a solid-liquid separation unit, and a filtrate reuse unit connected in sequence; the pretreatment unit includes an aeration tank and a multi-layer filter screen at its inlet end for preliminary filtration and aeration of wastewater; the chemical treatment unit includes a coagulation oxidation tank connected to the aeration tank via a third lift pump, and a flocculation tank connected to the coagulation oxidation tank via a second lift pump, the coagulation oxidation tank being connected to a coagulant dosing system and an oxidizing agent dosing system, and having a built-in agitator, the flocculation tank being connected to a flocculant dosing system; the solid-liquid separation unit includes a plate and frame filter press connected to the flocculation tank via a first lift pump, and a tank for collecting filtrate is provided below the plate and frame filter press; the filtrate reuse unit includes a filtrate storage tank connected to the tank via a second diaphragm pump, and a glue-making tank connected to the filtrate storage tank via a first diaphragm pump.

[0005] A further feature of this invention is that the coagulant dosing system includes a coagulant tank and a coagulant pump; the oxidant dosing system includes an oxidant tank and an oxidant pump; and the flocculating agent dosing system includes a flocculating agent tank and a flocculating agent pump.

[0006] A further configuration of this utility model is as follows: the coagulation oxidation tank is mounted on weighing system three; the coagulation agent tank is mounted on weighing system four; the oxidation agent tank is mounted on weighing system two; and the flocculation agent tank is mounted on weighing system one.

[0007] A further feature of this invention is that the plate and frame filter press includes a hydraulic cylinder, a flange body driven by the hydraulic cylinder, and multiple filter blocks, the surface of which is provided with an ultra-fine three-layer filter screen.

[0008] A further feature of this invention is that the pretreatment unit also includes a second pipe for introducing positive pressure air into the aeration tank.

[0009] A further feature of this invention is that the stirrer is driven by a stirring motor.

[0010] A further feature of this invention is that a synchronous pulley is installed on the top of the stirrer and on the drive shaft of the stirring motor, and the two synchronous pulleys are connected by a synchronous belt drive.

[0011] In summary, this utility model has the following beneficial effects: 1. A synergistic treatment route of "pretreatment-chemical treatment-solid-liquid separation-filtrate reuse" is adopted. In the pretreatment unit, multi-layer filters and aeration tanks work together to effectively remove large particulate impurities and improve the biodegradability of wastewater. In the chemical treatment unit, through the continuous action of coagulation oxidation tank and flocculation tank, colloidal particles are first destabilized and colored substances are degraded by coagulants and oxidants, and then coagulants are used to form large and dense flocs, so that pollutants are thoroughly removed. Finally, high-pressure solid-liquid separation is carried out by plate and frame filter press, and the filtrate is clear, with stable and reliable water quality, which fully meets the requirements for reuse in production. 2. The entire system achieves precise automatic dosing of reagents and automatic fluid transport through the linkage of multiple pumps and weighing systems. For example, the coagulation oxidation tank, coagulation reagent tank, oxidation reagent tank and flocculant reagent tank are all set on independent weighing systems, which can monitor material consumption in real time and automatically adjust the dosage of reagent pumps through the control system, ensuring the stability of the treatment effect, while greatly reducing the intensity of manual operation and human error. 3. One of the core objectives of the organization is to achieve the recycling of filtrate. After the water is purified through the entire process, it is collected in the filtrate storage tank and finally transported to the glue-making tank for production by a diaphragm pump. This directly reduces the consumption of fresh water resources and the cost of wastewater treatment, realizes the internal circulation of production wastewater, and creates significant economic benefits while also conforming to the concepts of clean production and green manufacturing. 4. Using a plate and frame filter press as the key equipment in the solid-liquid separation unit, it can provide high filtration pressure under the drive of a hydraulic cylinder. Combined with the ultra-fine three-layer filter screen on the surface of the filter block, it can greatly reduce the moisture content of the filter cake and form solid waste with high dryness. This not only reduces the volume of sludge and facilitates subsequent disposal, but also further improves the water recovery rate. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1. Aeration tank; 2. Multi-layer filter screen; 3. Pipeline 1; 4. Pipeline 2; 5. Coagulant tank; 6. Coagulant pump; 7. Oxidant tank; 8. Oxidant pump; 9. Flocculant tank; 10. Weighing system 1; 11. Hydraulic cylinder; 12. Frame filter press; 13. Flange; 14. Filter block; 15. Filtrate storage tank; 16. Glue-making tank; 17. Diaphragm pump 1; 18. Diaphragm pump 2; 19. Tank; 20. Lift pump 1; 21. Flocculant pump; 22. Flocculation tank; 23. Lift pump 2; 24. Weighing system 2; 25. Weighing system 3; 26. Agitator motor; 27. Agitator; 28. Coagulation oxidation tank; 29. ​​Weighing system 4; 30. Lift pump 3. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings of the embodiments thereof.

[0015] Please see Figure 1 In this embodiment of the utility model, a water-based ink wastewater treatment and recycling mechanism includes a pretreatment unit, a chemical treatment unit, a solid-liquid separation unit, and a filtrate recycling unit connected in sequence.

[0016] The entire treatment process is as follows: Water-based ink wastewater first enters the pretreatment unit for preliminary filtration and aeration, then undergoes coagulation, oxidation, and flocculation reactions in the chemical treatment unit, followed by solid-liquid separation in the solid-liquid separation unit, and finally the filtrate enters the filtrate recycling unit for recovery. Each unit is described in detail below.

[0017] The pretreatment unit includes an aeration tank 1 and a multi-layer filter screen 2 located at its inlet. The aeration tank 1 is typically made of corrosion-resistant materials (such as stainless steel or engineering plastics), and its volume can be designed according to the treatment capacity. The inlet of the aeration tank 1 is equipped with a pipe 3, and the multi-layer filter screen 2 is installed at the outlet of the pipe 3 for preliminary filtration of the wastewater, removing large particulate impurities and suspended solids. The multi-layer filter screen 2 typically includes a coarse filter screen, a medium filter screen, and a fine filter screen, with the mesh size decreasing sequentially. This design effectively intercepts impurities of different sizes, preventing clogging of subsequent equipment.

[0018] Aeration tank 1 is also equipped with pipe 2 4, which is used to introduce positive pressure air into the tank. Pipe 2 4 is connected to an external air compressor or blower. The positive pressure air is evenly released into the wastewater through the aeration head (not shown) for aeration treatment. The aeration process can increase the dissolved oxygen in the wastewater, promote the partial degradation of organic matter, and at the same time play a stirring role to make the wastewater evenly mixed. The aeration time can be adjusted according to the properties of the wastewater.

[0019] The chemical treatment unit includes a coagulation oxidation tank 28 and a flocculation tank 22, which are connected by a pump. The coagulation oxidation tank 28 is connected to the aeration tank 1 via a lift pump 30, which is a corrosion-resistant pump (such as a fluoroplastic pump) to pump the pretreated wastewater into the coagulation oxidation tank 28. The coagulation oxidation tank 28 is usually a vertical tank made of stainless steel or PVC. An agitator 27 is built into the tank and is driven by a stirring motor 26. The stirring motor 26 is preferably a variable frequency motor with adjustable speed. Synchronous pulleys are installed on the top of the agitator 27 and the drive shaft of the stirring motor 26. The two synchronous pulleys are connected by a synchronous belt. This transmission method is smooth, low-noise, and easy to maintain.

[0020] The coagulation oxidation tank 28 is connected to a coagulant dosing system and an oxidant dosing system. The coagulant dosing system includes a coagulant tank 5 and a coagulant pump 6. The coagulant tank 5 is used to store coagulants, such as polyaluminum chloride (PAC) or aluminum sulfate. The coagulant pump 6 is a metering pump that accurately adds coagulants to the coagulation oxidation tank 28, and the dosage is automatically controlled according to the wastewater concentration. The oxidant dosing system includes an oxidant tank 7 and an oxidant pump 8. The oxidant tank 7 is used to store oxidants, such as sodium hypochlorite or hydrogen peroxide. The oxidant pump 8 is also a metering pump used to add oxidants to destroy the color and organic pollutants in the wastewater.

[0021] The flocculation tank 22 is connected to the coagulation oxidation tank 28 via a second booster pump 23. The second booster pump 23 pumps the coagulated and oxidized wastewater into the flocculation tank 22. The flocculation tank 22 is also a vertical tank with a volume similar to that of the coagulation oxidation tank 28 and the same material. The flocculation tank 22 is connected to a flocculant dosing system, including a flocculant tank 9 and a flocculant pump 21. The flocculant tank 9 is used to store flocculants, such as polyacrylamide (PAM). The flocculant pump 21 is a metering pump that adds flocculants to cause the fine flocs in the wastewater to agglomerate into larger flocs, which facilitates subsequent separation.

[0022] To precisely control the dosage of the chemicals, the coagulation oxidation tank 28 is mounted on the weighing system 25. The weighing system 25 uses a weighing sensor to monitor the weight of the tank in real time, thereby controlling the dosage of the chemicals. Similarly, the coagulation chemical tank 5 is mounted on the weighing system 29, the oxidation chemical tank 7 is mounted on the weighing system 24, and the flocculation chemical tank 9 is mounted on the weighing system 10. All of these weighing systems are connected to the control system (such as a PLC) to achieve automatic metering and dosing.

[0023] The solid-liquid separation unit includes a plate and frame filter press 12, which is connected to a flocculation tank 22 via a booster pump 20. The booster pump 20 pumps the flocculated wastewater into the plate and frame filter press 12. The plate and frame filter press 12 adopts a conventional structure, including a hydraulic cylinder 11, a flange body 13 driven by the hydraulic cylinder 11, and multiple filter blocks 14. The hydraulic cylinder 11 provides pressure to drive the flange body 13 to press the filter blocks 14. The surface of the filter blocks 14 is provided with an ultra-fine three-layer filter screen, including a support layer, a filter layer, and a protective layer, which can effectively trap the flocculated solid particles. A tank 19 is provided below the plate and frame filter press 12 for collecting the filtrate. The tank 19 is made of stainless steel and has a drain port at the bottom.

[0024] During operation, the plate and frame filter press 12 performs solid-liquid separation under pressure, with the solid forming a filter cake, which is cleaned periodically; the filtrate flows into the tank 19, and the processing time is adjusted according to the thickness of the filter cake.

[0025] The filtrate recycling unit includes a filtrate storage tank 15 and a glue-making tank 16. The filtrate storage tank 15 is connected to the tank body 19 via a second diaphragm pump 18. The second diaphragm pump 18 pumps the filtrate from the tank body 19 into the filtrate storage tank 15. The filtrate storage tank 15 is used to temporarily store the treated filtrate and is made of polyethylene. The glue-making tank 16 is connected to the filtrate storage tank 15 via a first diaphragm pump 17. The first diaphragm pump 17 pumps the filtrate into the glue-making tank 16 for the preparation of water-based inks or other industrial applications. The glue-making tank 16 is equipped with a stirring device (not shown) for mixing the filtrate and the glue-making raw materials.

[0026] In use, water-based ink wastewater first enters the pretreatment unit through pipe 3. As the wastewater flows through the multi-layer filter screen 2 installed at the bottom of pipe 3, large particles, suspended solids, and some colloids are progressively intercepted, completing the initial physical filtration. Subsequently, the wastewater undergoes aeration treatment in aeration tank 1, with positive pressure air introduced into the tank through pipe 4. This has multiple benefits: first, it increases the dissolved oxygen in the wastewater, creating conditions for subsequent microbial degradation; second, it uses the agitation of air bubbles to homogenize the water quality and prevent sedimentation; and third, it removes some volatile organic compounds from the wastewater. This stage lays a good foundation for subsequent chemical treatment. After pretreatment, the wastewater is transported by booster pump 30 to the coagulation oxidation tank 28 of the chemical treatment unit. In this tank, the coagulant dosing system (including coagulant tank 5 and coagulant pump 6) first precisely adds coagulant (such as PAC) to the wastewater. Under the strong stirring of agitator 27, the coagulant quickly mixes with the wastewater. Its function is to destabilize the small, stable colloidal particles in the wastewater through electrical, neutralization, and adsorption bridging effects, and initially coagulate them into micro-flocs. At the same time, the oxidation agent dosing system (including oxidation agent tank 7 and oxidation agent pump 8) adds oxidant (such as sodium hypochlorite) to the tank. The oxidant can effectively destroy the colored groups and recalcitrant organic molecules in water-based inks, thereby significantly reducing the color and chemical oxygen demand (COD) of the wastewater. Agitator 27 is driven by a stirring motor 26 through a transmission system consisting of a synchronous pulley and a synchronous belt, ensuring a stable and efficient stirring process, and allowing the agent to fully contact and react with the wastewater. Subsequently, the wastewater treated by coagulation and oxidation is lifted to the flocculation tank 22 by the second booster pump 23. Here, the flocculant dosing system (including the flocculant tank 9 and the flocculant pump 21) adds flocculants (such as PAM). In the relatively gentle stirring environment of the flocculation tank 22, the long molecular chains of the flocculant capture and connect the micro-flocs formed in the coagulation stage, forming large, dense floc-like flocs. This process greatly improves the settling performance and filterability of the flocs. The automation and accuracy of this unit are ensured by the weighing system: the coagulation oxidation tank 28 is placed on the third weighing system 25, the coagulation agent tank 5 is placed on the fourth weighing system 29, the oxidation agent tank 7 is placed on the second weighing system 24, and the flocculant tank 9 is placed on the first weighing system 10. These weighing systems monitor the weight changes of each tank in real time and transmit the data to the central control system, thereby realizing the automatic and precise dosing of the agents, avoiding waste and ensuring the best treatment effect. Wastewater containing a large amount of flocculent flocculation then enters the solid-liquid separation unit; the wastewater is pumped into the plate and frame filter press 12 by the booster pump 20; under the powerful pressure provided by the hydraulic cylinder 11, the plate and frame filter press 12 presses multiple filter blocks 14 through the flange body 13; under pressure, the wastewater passes through the ultra-fine three-layer filter screen on the surface of the filter blocks 14, where all suspended solids, colloids and flocculent flocculation are completely trapped in the filter chamber and pressurized to form a solid filter cake with extremely low water content; while the clear filtrate penetrates the filter medium and collects in the tank 19 below the plate and frame filter press 12; this process efficiently achieves the separation of pollutants and water; Finally, the separated clean filtrate enters the filtrate reuse unit; the filtrate in tank 19 is first transported by diaphragm pump 18 to filtrate storage tank 15 for temporary storage and water quality equalization; when subsequent production processes require water, diaphragm pump 17 pumps the filtrate from filtrate storage tank 15 into glue-making tank 16; since the filtrate has undergone the aforementioned multi-stage deep treatment, its clarity, impurity content and other indicators have met the production requirements, and it can be directly used for the formulation of water-based inks or other production processes, thereby realizing the closed-loop circulation and efficient reuse of water resources, achieving the goals of saving water resources, reducing emissions and reducing production costs.

[0027] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A water-based ink wastewater treatment and recycling mechanism, comprising a pretreatment unit, a chemical treatment unit, a solid-liquid separation unit, and a filtrate reuse unit connected in sequence, characterized in that: The pretreatment unit includes an aeration tank (1) and a multi-layer filter screen (2) located at its inlet end, for preliminary filtration and aeration of wastewater; The chemical treatment unit includes a coagulation oxidation tank (28) connected to an aeration tank (1) via a third lift pump (30), and a flocculation tank (22) connected to the coagulation oxidation tank (28) via a second lift pump (23). The coagulation oxidation tank (28) is connected to a coagulating agent dosing system and an oxidizing agent dosing system, and has a built-in agitator (27). The flocculation tank (22) is connected to a flocculant dosing system. The solid-liquid separation unit includes a plate and frame filter press (12) connected to a flocculation tank (22) via a booster pump (20), and a tank (19) for collecting filtrate is provided below the plate and frame filter press (12). The filtrate recycling unit includes a filtrate storage tank (15) connected to the tank (19) via diaphragm pump two (18), and a glue-making tank (16) connected to the filtrate storage tank (15) via diaphragm pump one (17).

2. The water-based ink wastewater treatment and recycling mechanism according to claim 1, characterized in that: The coagulant dosing system includes a coagulant tank (5) and a coagulant pump (6); the oxidant dosing system includes an oxidant tank (7) and an oxidant pump (8); the flocculant dosing system includes a flocculant tank (9) and a flocculant pump (21).

3. The water-based ink wastewater treatment and recycling mechanism according to claim 2, characterized in that: The coagulation oxidation tank (28) is set on the third weighing system (25); the coagulation agent tank (5) is set on the fourth weighing system (29); the oxidation agent tank (7) is set on the second weighing system (24); and the flocculant agent tank (9) is set on the first weighing system (10).

4. The water-based ink wastewater treatment and recycling mechanism according to claim 1, characterized in that: The plate and frame filter press (12) includes a hydraulic cylinder (11), a flange body (13) driven by the hydraulic cylinder (11), and a plurality of filter blocks (14), the surface of which is provided with an ultra-fine three-layer filter screen.

5. The water-based ink wastewater treatment and recycling mechanism according to claim 1, characterized in that: The pretreatment unit also includes a second pipe (4) for introducing positive pressure air into the aeration tank (1).

6. The water-based ink wastewater treatment and recycling mechanism according to claim 1, characterized in that: The agitator (27) is driven by the agitator motor (26).

7. The water-based ink wastewater treatment and recycling mechanism according to claim 6, characterized in that: Synchronous pulleys are installed on the top of the agitator (27) and the drive shaft of the agitator motor (26), and the two synchronous pulleys are connected by a synchronous belt drive.

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