An adsorption filter device for treating recalcitrant organic matter in recycled paper production wastewater

Abstract

This utility model relates to the field of wastewater treatment technology for recycled paper production, specifically an adsorption and filtration device for treating recalcitrant organic matter in recycled paper production wastewater. The device includes a treatment tank, inside which are arranged, from left to right, a primary filtration zone, an adsorption zone, an aeration zone, and a secondary filtration zone, with these zones sequentially connected. By partitioning the treatment tank and connecting them sequentially, this utility model achieves continuous treatment of recycled paper production wastewater from pretreatment, adsorption degradation, enhanced aeration to deep filtration. Each zone performs its specific function and works in concert, significantly improving the removal efficiency of recalcitrant organic matter.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology in recycled paper production, specifically to an adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater. Background Technology

[0002] During the production of recycled paper, a large amount of industrial wastewater containing recalcitrant organic matter is generated due to processes such as deinking, bleaching, and pulping of waste paper. This type of wastewater not only contains easily treatable impurities such as suspended fibers and colloidal particles, but also contains recalcitrant components such as long-chain alkanes, aromatic compounds, residual dyes, and lignin derivatives. It has a high chemical oxygen demand (COD) and poor biodegradability. If it is discharged directly, it will seriously pollute the water environment, and if it is not treated thoroughly, it will be difficult to meet environmental emission standards.

[0003] Currently, the treatment of wastewater from recycled paper production often employs a combined process of "pretreatment + biological treatment + deep filtration." However, this approach faces several technical challenges in practical application: First, the pretreatment stage relies heavily on single-screen filtration, which can only remove large particulate impurities. Furthermore, the screen is easily displaced or damaged by the impact of wastewater, leading to unstable pretreatment results and excessive load on subsequent adsorption or biological treatment units. Second, fixed-bed adsorption devices are commonly used in the adsorption process. However, adsorbents (such as activated carbon and resin) are prone to clogging due to contaminant adhesion, requiring frequent shutdowns for disassembly, cleaning, or replacement. This not only affects treatment efficiency but also increases maintenance costs. Third, the aeration enhancement stage often uses a single-tube aeration structure, resulting in uneven bubble distribution and insufficient contact with the wastewater, making it difficult to effectively enhance the activity of recalcitrant organic matter and increasing the load on subsequent deep filtration. Fourth, in the deep filtration stage, insufficient wastewater flow often prevents penetration of the filter membrane, and the lack of stable support makes the membrane prone to deformation and damage, affecting effluent quality.

[0004] In view of this, we propose an adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater.

[0006] The technical solution of this utility model is:

[0007] An adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater includes a treatment box. Inside the treatment box, from left to right, are arranged a primary filtration zone, an adsorption zone, an aeration zone, and a secondary filtration zone, with these zones connected sequentially. The primary filtration zone contains several parallel filter screens. The adsorption zone contains several vertically arranged adsorption cylinders and a vertically movable scraper. Each adsorption cylinder has a fixed support at its bottom. The scraper has perforations for the adsorption cylinders to pass through, and several bristles are provided on the inner wall of the perforations. The aeration zone contains an annular aeration pipe near the bottom, with several equally spaced nozzles installed at the top. The filtration zone contains several filter membranes, and a pressurization assembly is located above the filters. By dividing the treatment tank into zones and connecting them sequentially, continuous treatment of recycled paper production wastewater is achieved, from pretreatment, adsorption degradation, enhanced aeration to deep filtration. Each zone performs its own function and works in concert, significantly improving the removal efficiency of recalcitrant organic matter. The parallel filter screens in the primary filtration zone can efficiently intercept suspended impurities in the wastewater, reducing the pollutant load in the subsequent adsorption and filtration zones. The symmetrically fixed support blocks at the bottom of the filter screens ensure that the filter screens are installed firmly, preventing the filter screens from shifting or being damaged by the impact of wastewater, ensuring the stable operation of the pretreatment stage, and laying a good foundation for subsequent treatment processes.

[0008] As a preferred technical solution, each filter screen has two symmetrically arranged support blocks at its bottom, and both support blocks are fixedly connected to the inner wall of the primary filtration zone. The symmetrically fixed support blocks at the bottom of the filter screen ensure that the filter screen is installed stably.

[0009] As a preferred technical solution, two lead screws are symmetrically and rotatably installed within the adsorption zone. The scraper is threadedly connected to both lead screws. Two drive motors are installed on the top of the treatment box, and the output shafts of the two drive motors are coaxially fixed to the two lead screws. The drive motors drive the lead screws to rotate, thereby driving the scraper to move up and down along the adsorption cylinder. The scratches on the inner ring wall of the scraper's perforations can simultaneously scrape and clean the surface of the adsorption cylinder, effectively removing contaminants adhering to the surface of the adsorption cylinder.

[0010] As a preferred technical solution, an aerator is fixedly installed at the bottom of the treatment tank, and an air supply pipe is installed at the air outlet of the aerator, which is connected to the interior of the annular aeration pipe. The gas generated by the aerator is transported to the annular aeration pipe through the air supply pipe, and then evenly sprayed out by nozzles arranged at equal intervals at the top, forming a large number of bubbles that fully contact the wastewater.

[0011] As a preferred technical solution, the secondary filtration zone contains two filter membranes, with a vertical plate between them, and the vertical plate is fixedly connected to both filter membranes. By using two filter membranes in the secondary filtration zone, multi-stage deep filtration of wastewater is achieved, further intercepting and removing residual recalcitrant organic matter and minute impurities from the previous treatment.

[0012] As a preferred technical solution, the bottom of the treatment tank is symmetrically and fixedly equipped with two support legs. The top of the treatment tank has an inlet pipe located above the primary filtration zone and an outlet pipe located at the bottom of the secondary filtration zone. An outlet valve is installed on the outlet pipe. The symmetrically arranged support legs at the bottom of the treatment tank can raise the entire device, the top inlet pipe facilitates a stable input of wastewater into the treatment tank, and the bottom outlet pipe, in conjunction with the outlet valve, allows for flexible control of the water discharge rhythm.

[0013] As a preferred technical solution, the pressurizing assembly includes a water outlet hood fixed to the top of the secondary filtration zone. A water pump connected to the aeration zone is installed on the top of the water outlet hood, and a pressurizing water pump is installed on the water pump. The pressurizing assembly provides sufficient power for the wastewater to pass through the secondary filtration membrane, ensuring that the wastewater can smoothly penetrate the filtration membrane to complete deep filtration and effectively improve filtration efficiency.

[0014] As a preferred technical solution, a sealing cover is provided on the front side of the treatment box, and the sealing cover is fixedly connected to the treatment box by a number of equally spaced fixing bolts. The sealing cover can be opened by removing the fixing bolts, which facilitates the maintenance, replacement and cleaning of the filter screen, adsorption cylinder, filter membrane and other components inside the treatment box by the staff, reducing the difficulty and cost of maintenance, improving the convenience of operation and maintenance of the device, and ensuring the long-term stable operation of the device.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention achieves continuous treatment of recycled paper production wastewater from pretreatment, adsorption degradation, enhanced aeration to deep filtration by dividing the treatment tank into zones and connecting them sequentially. Each zone performs its own function and works in concert, significantly improving the removal efficiency of recalcitrant organic matter. The parallel filter screens in the primary filtration zone can efficiently intercept suspended impurities in the wastewater, reducing the pollutant load in the subsequent adsorption and filtration zones. The symmetrically fixed support blocks at the bottom of the filter screens ensure stable installation, preventing displacement or damage caused by wastewater impact, ensuring stable operation of the pretreatment stage, and laying a good foundation for subsequent treatment processes. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 In this utility model Figure 1Internal structure diagram;

[0019] Figure 3 This is a schematic diagram of the scraper structure in this utility model;

[0020] Figure 4 This is a schematic diagram of the annular aeration pipe in this utility model;

[0021] The meanings of the labels in the diagram are as follows:

[0022] 1. Treatment box; 10. Primary filtration zone; 100. Filter screen; 101. Support block; 11. Adsorption zone; 110. Adsorption cylinder; 111. Support base; 112. Scraper; 113. Drive motor; 114. Lead screw; 115. Perforation; 116. Scraping; 12. Secondary filtration zone; 120. Filter membrane; 121. Vertical plate; 122. Water pump; 123. Pressurized water pump; 124. Water outlet cover; 13. Aeration zone; 130. Annular aeration pipe; 131. Nozzle; 2. Sealing cover plate; 3. Inlet pipe; 4. Outlet pipe; 40. Outlet valve; 5. Support leg; 6. Aerator; 60. Air supply pipe. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-4 This utility model provides a technical solution:

[0025] An adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater includes a treatment box 1. The treatment box 1 contains, from left to right, a primary filtration zone 10, an adsorption zone 11, an aeration zone 13, and a secondary filtration zone 12, with these zones connected sequentially. The primary filtration zone 10 contains several parallel filter screens 100. The adsorption zone 11 contains several vertically arranged adsorption cylinders 110 and a vertically movable scraper 112. Each adsorption cylinder 110 has a fixed support base 111 at its bottom. The scraper 112 has perforations 115 for the adsorption cylinders 110 to pass through, and several bristles 116 are provided on the inner wall of the perforations 115. The aeration zone 13 contains an annular aeration pipe 130 near its bottom, with several equally spaced nozzles 131 installed at the top. The filtration zone contains several filter membranes 120, and a pressurization assembly is located above the filters. By dividing the treatment tank 1 into zones and connecting them sequentially, continuous treatment of recycled paper production wastewater is achieved, from pretreatment, adsorption degradation, enhanced aeration to deep filtration. Each zone performs its own function and works in concert, significantly improving the removal efficiency of recalcitrant organic matter. The parallel filter screens 100 in the primary filtration zone 10 can efficiently intercept suspended impurities in the wastewater, reducing the pollutant load on the subsequent adsorption zone 11 and filtration zone. The symmetrically fixed support blocks 101 at the bottom of the filter screens 100 ensure that the filter screens 100 are installed firmly, preventing the filter screens 100 from shifting or being damaged due to wastewater impact, ensuring the stable operation of the pretreatment stage and laying a good foundation for subsequent treatment processes.

[0026] As a preferred embodiment, each filter screen 100 is symmetrically provided with two support blocks 101 at its bottom, and both support blocks 101 are fixedly connected to the inner wall of the primary filtration zone 10. The symmetrically fixed support blocks 101 at the bottom of the filter screen 100 can ensure that the filter screen 100 is installed firmly.

[0027] In a preferred embodiment, two lead screws 114 are symmetrically and rotatably installed within the adsorption zone 11. The scraper 112 is threadedly connected to both lead screws 114. Two drive motors 113 are installed on the top of the treatment box 1, and the output shafts of the two drive motors 113 are coaxially fixed to the two lead screws 114 respectively. The drive motors 113 drive the lead screws 114 to rotate, thereby driving the scraper 112 to move up and down along the adsorption cylinder 110. The bristles 116 on the inner annular wall of the scraper 112 through the perforation 115 can simultaneously scrape and clean the surface of the adsorption cylinder 110, effectively removing contaminants adhering to the surface of the adsorption cylinder 110.

[0028] In a preferred embodiment, an aerator 6 is fixedly installed at the bottom of the treatment tank 1. An air supply pipe 60 is installed at the air outlet of the aerator 6, and the air supply pipe 60 is internally connected to the annular aeration pipe 130. The gas generated by the aerator 6 is transported to the annular aeration pipe 130 through the air supply pipe 60, and then evenly sprayed out by the nozzles 131 arranged at equal intervals at the top, forming a large number of bubbles that fully contact the wastewater.

[0029] In a preferred embodiment, two filter membranes 120 are provided in the secondary filtration zone 12, and a vertical plate 121 is provided between the two filter membranes 120. The vertical plate 121 is fixedly connected to both filter membranes 120. By setting two filter membranes 120 in the secondary filtration zone 12, multi-stage deep filtration of wastewater is achieved, further intercepting and removing the recalcitrant organic matter and minute impurities remaining after the previous treatment.

[0030] In a preferred embodiment, two support legs 5 are symmetrically fixedly installed at the bottom of the treatment tank 1. An inlet pipe 3 is located above the primary filtration zone 10 at the top of the treatment tank 1, and an outlet pipe 4 is located at the bottom of the secondary filtration zone 12. An outlet valve 40 is installed on the outlet pipe 4. The symmetrically arranged support legs 5 at the bottom of the treatment tank 1 can raise the entire device. The top inlet pipe 3 facilitates a stable input of wastewater into the treatment tank 1, and the bottom outlet pipe 4, in conjunction with the outlet valve 40, allows for flexible control of the water output rhythm.

[0031] In a preferred embodiment, the pressurization assembly includes a water outlet cover 124 fixed to the top of the secondary filtration zone 12. A water pump 122 communicating with the aeration zone 13 is installed on the top of the water outlet cover 124, and a pressurization water pump 123 is installed on the water pump 122. The pressurization assembly provides sufficient power for the wastewater to pass through the secondary filtration membrane 120, ensuring that the wastewater can smoothly penetrate the filtration membrane 120 to complete deep filtration and effectively improve the filtration efficiency.

[0032] In a preferred embodiment, a sealing cover 2 is provided on the front side of the treatment box 1. The sealing cover 2 is fixedly connected to the treatment box 1 by a number of equally spaced fixing bolts. The sealing cover 2 can be opened by removing the fixing bolts, which facilitates the maintenance, replacement and cleaning of components such as the filter screen 100, adsorption cylinder 110 and filter membrane 120 inside the treatment box 1 by the staff. This reduces the difficulty and cost of maintenance, improves the convenience of operation and maintenance of the device, and ensures the long-term stable operation of the device.

[0033] This utility model's adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater achieves continuous wastewater treatment through zoned coordination and component linkage: Recycled paper production wastewater enters the primary filtration zone 10 of the treatment tank 1 through the inlet pipe 3, where suspended impurities are intercepted by the filter screen 100 with support blocks 101, completing pretreatment; subsequently, the wastewater flows into the adsorption zone 11, where recalcitrant organic matter is adsorbed by the vertical adsorption cylinder 110. Simultaneously, the drive motor 113 drives the lead screw 114 to move the scraper 112 up and down, and the scraper 112, with its perforations 115, removes the recalcitrant organic matter. The adsorption cylinder 110 is cleaned in real time by the 116 nozzle to prevent clogging. Then, the wastewater enters the aeration zone 13, where the aerator 6 sprays air bubbles through the air supply pipe 60, the annular aeration pipe 130, and the nozzle 131, agitating the wastewater and assisting in the separation of light pollutants. Afterwards, the pressurized water pump 123 pumps the wastewater through the suction pipe 122 to the outlet hood 124 of the secondary filtration zone 12. Under pressure, the wastewater passes through two filter membranes 120 supported by vertical plates 121 to complete deep filtration. Finally, the qualified wastewater is discharged through the outlet pipe 4 (the speed can be controlled by the outlet valve 40). During operation, the support legs 5 raise the device to provide operating space, and the sealing cover 2 can be opened by removing the fixing bolts, facilitating internal component inspection and maintenance and ensuring stable operation of the device.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater, characterized in that: The system includes a treatment box (1), which contains, from left to right, a primary filtration zone (10), an adsorption zone (11), an aeration zone (13), and a secondary filtration zone (12), with the zones connected sequentially. The primary filtration zone (10) contains several parallel filter screens (100), and the adsorption zone (11) contains several vertically arranged adsorption cylinders (110) and a scraper (112) that can move up and down. Each adsorption cylinder (110) has a fixed installation at its bottom. There is a support base (111), the scraper (112) has a perforation (115) for the adsorption cylinder (110) to pass through, and a number of scraper bristles (116) are provided on the inner ring wall of the perforation (115). An annular aeration pipe (130) is provided near the bottom in the aeration zone (13), and a number of nozzles (131) are installed at equal intervals on the top of the annular aeration pipe (130). A number of filter membranes (120) are provided in the filtration zone, and a pressurization component is provided above the filter.

2. The adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater as described in claim 1, characterized in that: Each of the filter screens (100) has two symmetrical support blocks (101) at its bottom, and both support blocks (101) are fixedly connected to the inner wall of the primary filtration zone (10).

3. The adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater as described in claim 2, characterized in that: Two lead screws (114) are symmetrically rotated in the adsorption zone (11). The scraper (112) is threadedly connected to both lead screws (114). Two drive motors (113) are installed on the top of the processing box (1). The output shafts of the two drive motors (113) are coaxially fixed with the two lead screws (114).

4. The adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater as described in claim 3, characterized in that: An aerator (6) is fixedly installed at the bottom of the treatment box (1). An air supply pipe (60) is installed at the air outlet of the aerator (6). The air supply pipe (60) is connected to the inside of the annular aeration pipe (130).

5. The adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater as described in claim 4, characterized in that: The secondary filtration zone (12) has two filter membranes (120), and a vertical plate (121) is provided between the two filter membranes (120). The vertical plate (121) is fixedly connected to both filter membranes (120).

6. The adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater as described in claim 5, characterized in that: The bottom of the treatment box (1) is symmetrically fixed with two support legs (5). The top of the treatment box (1) is provided with an inlet pipe (3) above the primary filtration zone (10) and an outlet pipe (4) at the bottom of the secondary filtration zone (12). An outlet valve (40) is installed on the outlet pipe (4).

7. The adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater as described in claim 6, characterized in that: The pressurization assembly includes a water outlet cover (124) fixed on the top of the secondary filtration zone (12), a water pump (122) connected to the aeration zone (13) is installed on the top of the water outlet cover (124), and a pressurization water pump (123) is installed on the water pump (122).

8. The adsorption filtration device for treating recalcitrant organic matter in recycled paper production wastewater as described in claim 7, characterized in that: The processing box (1) is provided with a sealing cover (2) on the front side. The sealing cover (2) is fixedly connected to the processing box (1) by a number of equally spaced fixing bolts.

Images