Disinfecting and filtering equipment for printing and dyeing wastewater

Abstract

The invention relates to the technical field of printing and dyeing wastewater treatment, and discloses printing and dyeing wastewater disinfection and filtration equipment which comprises a treatment tank. According to the scheme, the independently lifted second accommodating cavity is used as a coagulating sedimentation core area, the primary filtering holes are formed in the middle upper part of the side wall of the second accommodating cavity, and the deslagging valve is arranged at the bottom, so that the problems that sludge disturbs filtration and filter material blockage is quick in the traditional equipment are effectively solved. A mechanical scraper self-cleaning mechanism in the cavity is combined with a deep filtering area outside the cavity, so that efficient solid-liquid separation and deep purification are realized. The system strictly executes quality-based flow division, chemical sludge and flushing sewage are collected in different paths, and subsequent problems caused by mixing treatment are avoided. All the units are connected through gravity flow, so that intermittent batch treatment which is energy-saving and easy to maintain is realized while the effluent quality is ensured, and the stability and the economical efficiency of the system are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of dyeing and printing wastewater treatment technology, specifically to a dyeing and printing wastewater disinfection and filtration device. Background Technology

[0002] The dyeing and printing industry is a major contributor to industrial wastewater discharge. Its wastewater is complex, typically characterized by high color, high organic matter concentration, large fluctuations in water quality, and the presence of recalcitrant substances. Achieving efficient and deep treatment and reuse of dyeing and printing wastewater is crucial for the industry to practice water conservation, emission reduction, and green development. An ideal reuse treatment system needs to not only remove suspended solids (SS) and chemical oxygen demand (COD), but also focus on overcoming decolorization challenges, properly addressing chemical sludge generated by coagulant addition, and resolving practical issues such as equipment contamination and maintenance difficulties during long-term operation.

[0003] In existing technologies, "coagulation sedimentation + deep filtration" is a classic process for treating dyeing and printing wastewater. While it has advantages such as a clear route and mature technology, it still faces many challenges in actual operation. The flocs formed after coagulation of dyeing and printing wastewater are usually light and viscous, resulting in poor separation in traditional sedimentation units and a tendency for "alum runoff." This causes the flocs to penetrate into the filtration unit, rapidly clogging and caking the filter media, leading to decreased system filtration efficiency and frequent backwashing. Furthermore, flocs adhering to the inner wall of the sedimentation zone and the effluent channel are difficult to completely remove, and long-term accumulation affects the stability and treatment capacity of the system. Simultaneously, the maintenance of the deep filtration unit under the existing structure is extremely inconvenient; the inspection, replacement, or cleaning of the filter media often requires large-scale disassembly, resulting in long system downtime and high maintenance costs. Regarding sludge disposal, chemical sludge and equipment flushing wastewater are often mixed and discharged, further increasing the difficulty of dewatering dyeing and printing sludge and the overall treatment cost.

[0004] Therefore, since the existing needs are not met, we propose a disinfection and filtration device for dyeing and printing wastewater. Summary of the Invention

[0005] This invention provides a disinfection and filtration device for dyeing and printing wastewater. This design utilizes an independently elevated second containment chamber as the core area for coagulation and sedimentation. Primary filter holes are located in the upper part of the chamber's side wall, and a sludge discharge valve is installed at the bottom, effectively solving the problems of sludge interference with filtration and rapid filter media clogging in traditional equipment. The mechanical scraper self-cleaning mechanism inside the chamber, combined with the external deep filtration zone, achieves efficient solid-liquid separation and deep purification. The system strictly implements separate collection and disposal, collecting chemical sludge and flushing wastewater separately to avoid subsequent problems caused by mixed treatment. Each unit is connected by gravity flow, ensuring effluent quality while achieving energy-saving, easy-to-maintain intermittent batch treatment, significantly improving system stability and economy, and solving the problems mentioned in the background section.

[0006] The present invention provides the following technical solution: a disinfection and filtration device for dyeing and printing wastewater, comprising a treatment tank, a water storage tank on one side of the treatment tank, a drainage trough on the other side of the treatment tank, a first receiving cavity in the middle of the treatment tank, a treatment box embedded in the first receiving cavity, multiple filter holes at the front and rear ends of the treatment box, an independent second receiving cavity inside the treatment box, primary filter holes evenly opened in the upper middle part of the side wall of the second receiving cavity, a slag discharge valve at the bottom of the second receiving cavity, and filter media filling the space of the treatment box outside the second receiving cavity;

[0007] A drive motor is provided above the top cover of the second receiving cavity. The transmission rod of the drive motor extends into the interior of the second receiving cavity. A first scraper and a second scraper are provided on the transmission rod.

[0008] As an optional solution of the dyeing and printing wastewater disinfection and filtration equipment of the present invention, the free end of the first scraper is provided with a locking block, and the inner wall of the second receiving cavity is provided with an arc-shaped groove that cooperates with the locking block.

[0009] As an optional solution for the disinfection and filtration equipment for dyeing and printing wastewater described in this invention, a self-cleaning pressurized water pump, main pipe, branch pipe and nozzle are also provided below the treatment tank, and the nozzle is located above the first receiving cavity and treatment box.

[0010] As an optional solution for the disinfection and filtration equipment for dyeing and printing wastewater described in this invention, the treatment tank is further provided with a lifting mechanism for lifting the treatment box. The lifting mechanism includes a drive motor located outside the treatment tank, a bevel gear connected to the output end of the drive motor, a driven gear meshing with the bevel gear, and a rack vertically installed outside the treatment box, wherein the driven gear meshes with the rack.

[0011] As an optional solution for the dyeing and printing wastewater disinfection and filtration equipment of the present invention, the lifting mechanism includes two sliding rods fixed to the inside of the treatment tank, a connecting block sleeved with the sliding rods is provided on the outside of the treatment box, and limit blocks are provided at the upper and lower ends of the sliding rods.

[0012] As an optional solution for the disinfection and filtration equipment for dyeing and printing wastewater described in this invention, the water storage tank is equipped with a chemical dosing disinfection device.

[0013] As an optional solution of the dyeing and printing wastewater disinfection and filtration equipment of the present invention, a drain pipe is provided between the first receiving cavity and the water storage tank.

[0014] As an optional solution for the dyeing and printing wastewater disinfection and filtration equipment of the present invention, the treatment tank is provided with a flushing water drain outlet that communicates with the first receiving cavity, the flushing water drain outlet is connected to the drainage trough, and the sludge discharge valve is connected to an independent sludge collection trough.

[0015] As an optional solution of the dyeing and printing wastewater disinfection and filtration equipment described in this invention, the second receiving cavity is provided with a feed inlet on its top cover.

[0016] The present invention has the following beneficial effects:

[0017] 1. This dyeing and printing wastewater disinfection and filtration equipment utilizes a separate, elevated second containment chamber as the core area for coagulation and sedimentation. Primary filter holes are located in the upper part of the chamber's side wall, and a sludge discharge valve is installed at the bottom. This solves the problems of sludge easily interfering with filtration, rapid filter media clogging, and inconvenient maintenance found in traditional integrated equipment. Simultaneously, combined with a mechanical scraper self-cleaning mechanism within the chamber and a backwashable deep filtration zone outside the chamber, it achieves highly efficient solid-liquid separation and deep purification. The system strictly adheres to the principle of separate collection and disposal, collecting chemical sludge and equipment flushing wastewater separately, avoiding the difficulties and high costs of subsequent treatment caused by waste mixing. Finally, gravity flow connects each unit, ensuring effluent quality while achieving energy-saving, easy-to-maintain intermittent batch treatment, overcoming the shortcomings of existing technologies such as high energy consumption, complex operation, and poor system stability.

[0018] 2. This dyeing and printing wastewater disinfection and filtration equipment, through the setting of a lifting mechanism composed of a drive motor, bevel gears, and gear racks, combined with flexible pipelines and guide slides with limit blocks, solves the problems of narrow operating space, time-consuming and labor-intensive, and safety hazards when inspecting, replacing, or thoroughly cleaning filter media in traditional fixed filter boxes. This design avoids the maintenance methods that require complex manual digging or large-scale disassembly of the system in existing technologies, minimizing offline maintenance window periods and labor costs. By smoothly lifting the entire treatment box to a suitable height, the deep filtration zone is fully exposed, realizing intuitive, convenient, and standardized maintenance operations, fundamentally ensuring the long-term stability and treatment efficiency of the system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the first cross-sectional structure of the local treatment pool of the present invention;

[0021] Figure 3 This is a schematic diagram of the second cross-sectional structure of the local treatment pool of the present invention;

[0022] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0023] Figure 5 This is a schematic diagram of the internal structure of the processing box of the present invention;

[0024] Figure 6 This is a schematic diagram of the telescopic rod structure of the present invention.

[0025] In the diagram: 1. Treatment pool;

[0026] 101. Water storage tank; 102. Drainage trough; 103. First receiving cavity; 104. Treatment box; 105. Filter through hole; 106. Drain outlet; 107. Top cover; 108. Second receiving cavity; 109. Treatment component; 110. Drainage pipe; 111. Main pipe; 112. Branch pipe; 113. Nozzle; 114. Slide rod; 115. Connecting block; 116. Transmission rod; 117. First scraper; 118. Second scraper; 119. Telescopic rod; 120. Ball bearing; 121. Driven gear; 122. Rack; 123. Arc groove; 124. Locking block; 125. Bevel gear. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0028] Example 1, please refer to Figures 1-6By placing the water storage tank 101 and the drainage trough 102 on opposite sides of the treatment tank 1, this arrangement enables the directional and orderly flow of water, creating stable hydraulic conditions for the internal treatment process. Simultaneously, the treatment tank 104 is embedded within the first receiving cavity 103 in the middle of the treatment tank 1. This layout results in a compact overall structure and clearly defined functional zones. Multiple filter holes 105 at the front and rear of the treatment tank 104 ensure even distribution of water flow as it enters subsequent areas. The independently located second receiving cavity 108 within this cavity forms a core area specifically for coagulation and initial sedimentation. The primary filter holes evenly distributed in the upper part of the side wall of this cavity are located at the height of the supernatant layer after sedimentation. This design ensures that after sedimentation, the clarified water... The supernatant can overflow naturally through these channels first, effectively preventing the sedimented sludge from being agitated again, thus ensuring the clarity of the primary effluent. The sludge discharge valve at the bottom of the second receiving chamber 108 can be activated first after the static sedimentation stage, completely discharging the settled thick sludge into an independent sludge collection tank (not shown in the figure, independent of the drainage tank 102). This step ensures that the subsequent filtration stage is not disturbed by sludge and greatly reduces the load on the deep filtration zone. The space in the treatment tank 104 outside the second receiving chamber 108 is filled with filter media to form a deep filtration zone, so that the supernatant flowing out of the primary filtration holes can further penetrate the filter media layer before being discharged from the system, adsorbing and removing fine suspended solids and residual color, thereby significantly improving the final effluent quality. In the overall design, the feed inlet is located on the top cover 107 of the second receiving chamber 108, which facilitates the addition of wastewater and coagulant. During the sedimentation stage, the system remains stationary, which is conducive to the full formation and natural settling of flocs. This segmented treatment method not only improves the treatment efficiency but also extends the service life of the filter media, reflecting the engineering optimization concept of "separation before filtration, functional zoning, and synergistic effect".

[0029] After the sludge removal operation is completed and the slag discharge valve is closed, the system immediately enters the deep filtration and clean water collection stage. At this time, the clear supernatant that has completed sedimentation in the second receiving chamber 108, under its own static pressure, naturally seeps into the external treatment tank 104 chamber slowly and evenly through the primary filter holes located in the upper part of the chamber. This process is driven entirely by the principle of hydrostatics and requires no additional energy input, reflecting the energy-saving characteristics of the system design. The supernatant then enters the deep filtration zone filled with filter media. In this zone, the water flows through multiple layers of filter media, and the residual fine suspended solids, color, and some dissolved substances are effectively adsorbed and intercepted by the filter media, thereby achieving secondary deep purification of the water quality. The clean water after deep filtration then collects in the first receiving chamber 103 and is smoothly introduced into the water storage tank 101 through several drain pipes 110 pre-installed between the first receiving chamber 103 and the water storage tank 101. The reasonable arrangement of the drain pipes 110 ensures the smooth transfer of water flow and avoids disturbance of the water in the water storage tank 101.

[0030] To ensure the biological safety of the reclaimed water, a special dosing disinfection device (such as a built-in slow-release chlorine tablet dispenser) is integrated inside the water storage tank 101. This device can continuously and stably disinfect the filtered water collected here, effectively inactivating any pathogenic microorganisms that may be present in the water, thereby ensuring the hygiene and safety of the produced water during storage and subsequent reuse. Thus, the system has completed the entire process from "static coagulation and sedimentation", "sludge separation and discharge", "deep infiltration filtration" to "safe disinfection and storage" in an orderly manner. The high-quality reclaimed water produced is safely stored in the water storage tank 101 and can be reused in the production process at any time, realizing the efficient circulation of water resources and the refined process control.

[0031] After the system completes the production of a batch of water, it enters a pre-set cleaning and maintenance phase. This design ensures that the core treatment process and equipment maintenance do not interfere with each other, guaranteeing the continuity and stability of the treatment. The cleaning process first targets the second receiving chamber 108, which is the core of the reaction: after ensuring that the liquid inside has been basically emptied to a low level through the slag discharge valve, the drive motor located above the top cover 107 is started. The drive motor drives the transmission rod 116 to rotate, and the two first scrapers 117 fixed on it rotate accordingly. The free ends of the first scrapers 117 are precisely engaged with the pre-set arc grooves 123 on the inner wall of the second receiving chamber 108 through specially designed locking blocks 124, so that they can always be tightly attached to the inner wall surface during rotation. This ingenious mechanism ensures that the scrapers can thoroughly clean the water. Scraping removes residual flocs and dirt adhering to the inner wall and around the primary filter pores, effectively preventing pore blockage and maintaining the unobstructed filtration channel in the next treatment cycle. At the same time, the second scraper 118 installed at the bottom rotates synchronously, loosening and collecting the small amount of residual sludge deposited in the bottom corner that is difficult to remove by gravity to the sludge discharge valve. After the scraping operation is completed, the scraped material can be discharged into an independent sludge collection tank with the help of a small amount of flushing water or by directly opening the sludge discharge valve. The whole process is carried out during the intermittent period when there is no wastewater treatment task, without affecting the normal coagulation and sedimentation process cycle.

[0032] The system's self-cleaning design is also comprehensive, adhering to the principle of differentiated treatment. For rinsing the first receiving chamber 103 and the area surrounding the treatment tank 104, the system activates a pressurized water pump to spray clean water stored in the water storage tank 101 through the main pipe 111 and the branch pipes 112 distributed above, from the nozzles 113 at a certain pressure for thorough rinsing. For rinsing the interior of the second receiving chamber 108, a separate dedicated rinsing branch pipe (which can be combined with an extension pipe in the diagram) provides directional spraying before and after the sludge scraping operation to help soften the dirt and ultimately clean the chamber. Crucially, all rinsing wastewater generated during the self-cleaning process, primarily consisting of physical contaminants, is treated by... A dedicated flushing water outlet, located on the outer side of the other end of the treatment tank 1 and connected to the first receiving cavity 103, discharges into the drainage trough 102 for collection and treatment. Meanwhile, the chemical sludge from the coagulation reaction is always discharged into the sludge collection tank through an independent sludge discharge valve. This strict separation of flushing wastewater and chemical sludge avoids the mixing of wastes of different properties, greatly simplifies the difficulty and cost of subsequent sludge dewatering and wastewater treatment, and demonstrates the system's precision and efficiency in overall waste management. Through this series of structured cleaning procedures, the system can quickly restore its optimal working state and prepare for stable and efficient operation in the next treatment cycle.

[0033] Example 2 aims to facilitate the maintenance and replacement of filter media in the deep filtration zone within the treatment tank 104. This example is an improvement upon Example 1. It is important to note that this lifting operation is part of a planned shutdown maintenance procedure for filter media maintenance. It is performed after the system has stopped receiving water, emptied the reaction unit, and completed cleaning. For details, please refer to [link to relevant documentation]. Figures 1-6 When the system reaches the preset maintenance cycle, the user can activate the lifting mechanism designed specifically for deep maintenance. At the beginning of the maintenance operation, the relevant pipeline valves are closed and the system is emptied. Then, another dedicated drive motor is started on the outer surface of one side of the treatment tank 1. The output end of the motor is connected to a set of bevel gears 125, which drives the driven gear 121 that is precisely meshed with it to rotate. The key is that the driven gear 121 meshes with the rack 122 that is vertically installed on the outer surface of one end of the treatment box 104, thereby converting the rotational motion of the motor into a stable and controllable vertical lifting motion of the treatment box 104.

[0034] Through this reliable mechanical transmission, the treatment box 104 can be lifted to a suitable working height, fully exposing the deep filtration zone filled with filter media inside to the field of vision and operating space. This makes the originally tedious maintenance work such as checking the condition of the filter media layer, thoroughly backwashing or replacing it extremely intuitive and convenient. To cooperate with this lifting movement, all pipelines connected to the treatment box 104 (such as flushing water pipes, overflow pipes, etc.) are connected with flexible hoses or quick connectors. They can be easily disconnected before lifting or have sufficient slack to perfectly adapt to the displacement of the treatment box 104. In addition, two connecting blocks 115 are symmetrically arranged on the outer surface of the other end of the treatment box 104. They are respectively sleeved on two sturdy sliding rods 114 fixed to the inner surface of the treatment pool 1. Limiting blocks are provided at both the upper and lower ends of the sliding rods 114. This precise guiding mechanism greatly ensures the stability, straightness and operational safety of the treatment box 104 during the lifting process, effectively preventing any twisting or jamming.

[0035] After all filter media maintenance is completed, the reverse drive motor can smoothly lower the treatment box 104 and accurately reset it to the initial working position. After reconnecting the pipeline, the system quickly returns to standby mode. This ingenious liftable design transforms the complex filter media maintenance work, which traditionally requires a lot of manpower and time, into an efficient, labor-saving, and safe standardized process. It minimizes the offline maintenance window of the system and ensures the long-term efficiency and stability of the wastewater treatment system.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A disinfection and filtration device for dyeing and printing wastewater, comprising a treatment tank (1), characterized in that: The treatment pool (1) is provided with a water storage tank (101) on one side and a drainage trough (102) on the other side. The treatment pool (1) is provided with a first receiving cavity (103) in the middle. The first receiving cavity (103) is embedded with a treatment box (104). The front and rear ends of the treatment box (104) are provided with multiple filter holes (105). The treatment box (104) is provided with an independent second receiving cavity (108). The upper part of the side wall of the second receiving cavity (108) is evenly provided with primary filter holes. The bottom of the second receiving cavity (108) is provided with a slag discharge valve. The space of the treatment box (104) outside the second receiving cavity (108) is filled with filter media. A drive motor is provided above the top cover (107) of the second receiving cavity (108). The transmission rod (116) of the drive motor extends into the interior of the second receiving cavity (108). A first scraper (117) and a second scraper (118) are provided on the transmission rod (116).

2. The disinfection and filtration equipment for dyeing and printing wastewater according to claim 1, characterized in that: The free end of the first scraper (117) is provided with a locking block (124), and the inner wall of the second receiving cavity (108) is provided with an arc-shaped groove (123) that cooperates with the locking block (124).

3. The dyeing and printing wastewater disinfection and filtration equipment according to claim 1, characterized in that: Below the treatment tank (1) are also provided a self-cleaning pressurized water pump, main pipe (111), branch pipe (112) and nozzle (113), the nozzle (113) being located above the first receiving cavity (103) and the treatment box (104).

4. The dyeing and printing wastewater disinfection and filtration equipment according to claim 1, characterized in that: The processing pool (1) is also provided with a lifting mechanism for lifting the processing box (104). The lifting mechanism includes a drive motor located outside the processing pool (1), a bevel gear (125) connected to the output end of the drive motor, a driven gear (121) meshing with the bevel gear (125), and a rack (122) vertically installed outside the processing box (104). The driven gear (121) meshes with the rack (122).

5. The dyeing and printing wastewater disinfection and filtration equipment according to claim 4, characterized in that: The lifting mechanism includes two sliding rods (114) fixed inside the treatment tank (1). The outer side of the treatment box (104) is provided with a connecting block (115) that is sleeved with the sliding rods (114). Limiting blocks are provided at the upper and lower ends of the sliding rods (114).

6. The dyeing and printing wastewater disinfection and filtration equipment according to claim 1, characterized in that: The water storage tank (101) is equipped with a chemical dosing and disinfection device.

7. The disinfection and filtration equipment for dyeing and printing wastewater according to claim 1, characterized in that: A drain pipe (110) is provided between the first receiving cavity (103) and the water storage tank (101).

8. The dyeing and printing wastewater disinfection and filtration equipment according to claim 1, characterized in that: The treatment tank (1) is provided with a flushing water drain outlet that communicates with the first receiving cavity (103). The flushing water drain outlet is connected to the drainage trough (102). The sludge discharge valve is connected to an independent sludge collection trough.

9. The dyeing and printing wastewater disinfection and filtration equipment according to claim 1, characterized in that: The second receiving cavity (108) has a feed inlet on its top cover (107).

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