A color-coated roll degreasing wastewater treatment system

Abstract

The application discloses a kind of color-coated roll degreasing wastewater treatment systems, including water treatment tank, be provided with the screen residue structure for waste residue adsorption in water treatment tank, and in water treatment tank cooperate screen residue structure to form waterway structure.The application is provided with the screen residue structure of multistage screen filter waste residue in water treatment tank, by three primary screen channel, secondary screen channel and tertiary screen channel and the filter plate matched with it, waste residue is screened in turn, so that non-solute waste residue in wastewater is efficiently multistage screen filtered, the medicine added in subsequent wastewater purification treatment cannot be consumed additionally in large amount, also improve the problem that iron and iron hydroxide residue are ground in flowing and treat system inner wall part, improve the effect of subsequent degreasing wastewater treatment, reduce processing difficulty;The shape and arrangement position of screen residue structure are designed, to form waterway structure in water treatment tank, adsorb waste residue with large-area pressure increase and decrease, reasonably design adsorption environment, and waste residue classified adsorption is left in screen residue structure.

Description

Technical Field

[0001] This invention relates to the field of degreasing wastewater treatment technology for color-coated rolls, specifically to a degreasing wastewater treatment system for color-coated rolls. Background Technology

[0002] Color-coated coils are products made from hot-dip galvanized steel sheets, hot-dip aluminum-zinc coated steel sheets, electro-galvanized steel sheets, etc., as substrates. After surface pretreatment (chemical degreasing and chemical conversion treatment), one or more layers of organic coating are applied to the surface, followed by baking and curing. They are commonly used in ship bulkheads and have broad application prospects in the marine field.

[0003] Currently, in the processing of color-coated steel coils, the main purpose of pretreatment is to remove grease and impurities from the surface of the strip steel. During alkaline cleaning with ultrasonic assistance, residual oil and iron powder on the surface of cold-rolled strip steel undergoes saponification and emulsification reactions, generating degreasing wastewater. The main pollutants in this wastewater are iron, ferric hydroxide, soaps, and emulsions floating on the surface. Chinese Patent Publication No. CN216918934U discloses a steel degreasing wastewater treatment system, comprising a pretreatment system, a coagulation and flotation system, a strong oxidation system, a biochemical treatment system, an external discharge guarantee system, and a sludge collection system connected by pipelines. This system aims to improve wastewater treatment efficiency and ensure stable effluent quality that meets standards.

[0004] However, iron and ferric hydroxide, which are insoluble in water, will float and disperse in the water as the wastewater flows. During the process of adding acid for neutralization and demulsification, a large amount of floating iron and ferric hydroxide will consume the acid and produce other products. In addition, the floating soap solution, emulsion, iron and ferric hydroxide will also mix together, which will seriously affect the rapid progress of the chemical reaction. At the same time, iron and ferric hydroxide will also abrade the inner walls of the parts of the treatment system during the flow, making subsequent waste residue cleaning difficult. The treatment system for purifying wastewater from the degreasing process of color-coated coils needs to be improved.

[0005] To address this issue, the inventors proposed a wastewater treatment system for degreasing of color-coated rolls. Summary of the Invention

[0006] The purpose of this invention is to provide a wastewater treatment system for degreasing color-coated rolls using waste residue screening, in order to solve the problem of waste residue affecting water treatment mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a degreasing wastewater treatment system for color-coated coils, including a water purification tank, wherein a sieve structure for adsorbing waste residue is provided inside the water purification tank, and a water channel structure is formed in conjunction with the sieve structure inside the water purification tank, so that the waste residue adsorbed in stages remains on the sieve structure.

[0008] The slag screening structure includes a primary screen, a secondary screen, and a tertiary screen in sequence along the wastewater direction. The three screens are equipped with perforated filter plates for multi-stage slag removal from the wastewater.

[0009] Filter plates: In conjunction with the magnetic heating device of the primary screen channel, they directly adsorb iron slag and ferric hydroxide slag coated with adhering emulsified oil floating matter, and heat up to disperse the agglomerated emulsified oil floating clumps, leaving adsorption space for iron slag and ferric hydroxide slag; In conjunction with the secondary screen channel, they comprehensively retain waste residue for adsorption; In conjunction with the tertiary screen channel, they adsorb residual waste residue in wastewater.

[0010] As an optional solution of the degreasing wastewater treatment system for color-coated rolls described in this invention, wherein: the first adsorption plate, the second adsorption plate, and the third adsorption plate are arranged sequentially at positions corresponding to the primary sieve channel, the secondary sieve channel, and the tertiary sieve channel on the filter plate.

[0011] As an optional solution of the degreasing wastewater treatment system for color-coated coils described in this invention, the primary screen includes two adsorption plates symmetrically arranged on both sides of the inner wall of the water treatment tank. An electromagnet is installed in the adsorption plate, and a first adsorption sheet is connected to the facing sides of the two adsorption plates respectively. A copper plate is embedded in the facing wall of the adsorption plates to separate the electromagnet and the first adsorption sheet. The electromagnet generates heat and conducts it outward. While the first adsorption sheet adsorbs the waste residue, the heat dissipates and disperses the agglomerated oil floating clumps.

[0012] As an optional solution of the color-coated coil degreasing wastewater treatment system of the present invention, wherein: the primary screen channel includes a sealing shell, a discharge magnet is inserted inside the sealing shell, and the copper plate is fixedly embedded in the wall surface of the sealing shell.

[0013] As an optional solution of the degreasing wastewater treatment system for color-coated rolls described in this invention, wherein: L-shaped bending plates are fixedly connected to both sides of the edge of the sealing shell to form a U-shaped first hanging plate, and the first adsorption sheet is set as a hollow honeycomb activated carbon plate with a rectangular plate structure, which is slidably inserted into the first hanging plate from top to bottom for holding.

[0014] As an optional solution of the degreasing wastewater treatment system for color-coated rolls described in this invention, the secondary screen channel includes baffles that are sealed at both ends and in contact with the inner wall of the water treatment tank. The middle part of the baffles is configured as a mesh structure to form a water-passing mesh plate, and L-shaped bent plates are fixedly connected at both ends. The two bent plates form a C-shaped second hanging plate facing the primary screen channel. The second adsorption sheet is slidably inserted into the second hanging plate from top to bottom and held in place.

[0015] As an optional solution of the degreasing wastewater treatment system for color-coated rolls described in this invention, the second adsorption sheet includes, in sequence along the water flow direction, an adsorption cotton layer, an activated carbon layer, and a filter cotton layer.

[0016] The absorbent cotton layer has a brushed surface on the side facing the primary sieve channel, and several guide holes are opened on the absorbent cotton layer, arranged in a vertical row at intervals.

[0017] Several staggered holes are made on the filter cotton layer, arranged vertically at intervals, and staggered from the position of the guide holes, so that the water flows out in a staggered manner when it flows out through the guide holes.

[0018] As an optional solution of the degreasing wastewater treatment system for color-coated rolls described in this invention, the filtration component corresponding to the first-level sieve channel in the three-stage sieve channel also includes the adsorption plate, and the adsorption plate is set as one, fixedly connected to the middle of the water purification tank, arranged vertically, with drainage space left on both sides, and the adsorption plate surface facing the baffle.

[0019] As an optional solution of the degreasing wastewater treatment system for color-coated rolls described in this invention, the filter plate includes a T-shaped connecting piece, which is set as a cloth piece or a rubber piece. The bottom edges of two first adsorption plates are connected at both ends of the T-shaped head of the connecting piece by a stitch, and the bottom edge of the middle part of the adsorption cotton layer is connected at the T-shaped tail of the connecting piece by a stitch.

[0020] As an optional solution of the degreasing wastewater treatment system for color-coated rolls described in this invention, the water channel structure includes: a water receiving pipe connected to the side wall of the water purification tank, and the interface of the water receiving pipe is connected to a water supply pipe.

[0021] The adsorption plates in the primary sieve channel are configured as arc-shaped structures, with the inner sides of the two adsorption plates facing each other. The two adsorption plates are fixedly connected to the inner wall of the water treatment tank facing the head of the water receiving pipe, forming a gathering cavity in the two adsorption plates. The gathering cavity includes a first inlet and a first outlet with gradually decreasing openings along the water flow direction.

[0022] The baffle plate has a triangular pyramidal structure, and the second adsorption plate is correspondingly set as a triangular pyramidal shape with the cone head facing the first outlet to divert and reduce the pressure of wastewater flow; slag receiving cavities are formed on both sides of the baffle plate, and a drainage cavity is formed on the inner side of the cone at the rear of the baffle plate;

[0023] The adsorption plate of the three-stage sieve is set as an arc-shaped structure, with the outer arc surface facing the drainage cavity. The third adsorption plate is arranged on the outer arc surface, and an arc-shaped opening is formed on both sides of the third adsorption plate. There are openings on both sides of the arc-shaped opening.

[0024] The water inlet pipe includes a water delivery port and a bottom flushing port from top to bottom. The bottom flushing port is located at the bottom of the water purification tank, and the bottom edge of the bottom flushing port is flush with the inner bottom surface of the water purification tank. One end of the water delivery pipe is provided with a first water inlet pipe and a second water inlet pipe in sequence, corresponding to the water delivery port and the bottom flushing port.

[0025] An upstream guide plate is fixedly connected to the outer wall of the second hanging plate at both ends of the baffle. The upstream guide plate includes a vertical plate and a horizontal plate that are connected. One end of the horizontal plate is fixedly connected to the second hanging plate through a connecting plate. The vertical plates are spaced close to the middle of the side of the second adsorption sheet, and the width of the vertical plates is set not to exceed half the width of the side of the second adsorption sheet.

[0026] The horizontal plate is configured as an L-shaped structure with a horizontal groove at the bottom. The vertical plate is configured as an L-shaped structure with a vertical groove on its inner side that connects to the horizontal groove. Together, they form an upward flow guide trough that guides the waste slag upward.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. This degreasing wastewater treatment system for color-coated coils features a multi-stage sieving structure within the water treatment tank. Through three primary, secondary, and tertiary sieves and their corresponding filter plates, waste residue is sequentially removed. This ensures efficient multi-stage filtration of non-solute waste residue (iron and ferric hydroxide slag) in the wastewater. This prevents the additional consumption of chemicals added during subsequent wastewater purification. It also mitigates the problem of iron and ferric hydroxide slag grinding against the inner walls of system components during flow, improving the effectiveness of subsequent degreasing wastewater treatment and reducing treatment difficulty.

[0029] 2. The degreasing wastewater treatment system for color-coated coils is designed with a screen structure in terms of shape and arrangement. A water channel structure is formed in the water treatment tank to adsorb waste residue over a large area with increased and decreased pressure. The adsorption environment is designed so that the waste residue is adsorbed in stages and remains in the screen structure.

[0030] 3. This color-coated coil degreasing wastewater treatment system, in conjunction with the entire screen structure and drainage system, adopts separate water inlets at the top and bottom for water delivery. While delivering wastewater, it washes away the waste residue that has accumulated at the corner edges. At the same time, it uses an upward guide plate to guide the accumulated waste residue at the overall filter block upward, which improves the problem of waste residue easily accumulating at the corner edges in the irregularly designed multi-sided screen structure and improves the waste residue treatment effect. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the internal structure of the present invention.

[0032] Figure 2 This is a schematic diagram of the main structure of the present invention.

[0033] Figure 3 This is a schematic diagram of the main structure of the slag screening structure of the present invention.

[0034] Figure 4 This is a partial top view of the internal structure of the present invention.

[0035] Figure 5 This is a partial structural diagram of the connection relationship at the primary sieve channel of the present invention.

[0036] Figure 6 This is a partial exploded cross-sectional view of the connection relationship at the primary sieve channel of the present invention.

[0037] Figure 7 This is a schematic diagram showing a partial structure of the connection relationship at the barrier of the present invention.

[0038] Figure 8 This is a schematic diagram of the exploded structure of the second adsorption sheet of the present invention.

[0039] Figure 9 This is a side view of the three-stage sieve channel structure of the present invention.

[0040] In the diagram: 1. Water treatment tank; 101. Sealed door; 2. Primary screen; 201. Adsorption plate; 2011. Sealed shell; 2012. Electromagnet; 2013. Copper plate; 2014. First hanging plate; 202. Gathering chamber; 203. First inlet; 204. First outlet; 3. Secondary screen; 301. Baffle; 3011. Mesh plate; 3012. Second hanging plate; 302. Slag receiving chamber; 303. Drainage chamber; 4. Tertiary screen; 401. Arc-shaped opening; 402. Through port; 5. Water receiving pipe; 50 1. Water supply interface; 502. Bottom flushing interface; 6. First adsorption plate; 7. Connecting plate; 8. Second adsorption plate; 801. Adsorption cotton layer; 8011. Brushed velvet surface; 8012. Guide hole; 802. Activated carbon layer; 803. Filter cotton layer; 8031. Misalignment hole; 9. Third adsorption plate; 10. Upstream guide plate; 1001. Vertical plate; 1002. Vertical groove; 1003. Horizontal plate; 1004. Horizontal groove; 11. Upstream guide groove; 12. Water supply pipe; 1201. First water inlet pipe; 1202. Second water inlet pipe. Detailed Implementation

[0041] 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.

[0042] Please see Figure 1-9 The present invention provides a technical solution: a degreasing wastewater treatment system for color-coated rolls, used to screen out non-solute waste residue (iron and ferric hydroxide residue) in the wastewater, to purify the degreasing wastewater, improve the effect of subsequent wastewater treatment, and reduce the difficulty of treatment. It includes a water purification tank 1, which is equipped with a slag screen structure for waste residue adsorption. The slag screen structure is also used to form a water channel structure in the water purification tank 1, so that the waste residue adsorbed in stages remains on the slag screen structure.

[0043] The slag screening structure includes, in sequence along the wastewater direction, a primary sieve channel 2, a secondary sieve channel 3, and a tertiary sieve channel 4. The three sieve channels are detachably equipped with perforated filter plates for multi-stage slag removal from the wastewater.

[0044] Filter plates: In conjunction with the magnetic heating device of the primary screen channel 2, they directly adsorb iron slag and ferric hydroxide slag coated with adhering emulsified oil floating matter, and heat up to disperse the aggregated emulsified oil floating agglomerates, leaving adsorption space for iron slag and ferric hydroxide slag; In conjunction with the secondary screen channel 3, they completely retain waste residue for adsorption; In conjunction with the tertiary screen channel 4, they adsorb residual waste residue in wastewater.

[0045] In this embodiment, the first adsorption plate 6, the second adsorption plate 8, and the third adsorption plate 9 are arranged sequentially at positions corresponding to the primary sieve channel 2, the secondary sieve channel 3, and the tertiary sieve channel 4 on the filter plate to sequentially remove waste residue.

[0046] Multi-stage screening of waste residue:

[0047] In this embodiment, the primary screen channel 2 includes two adsorption plates 201 symmetrically arranged on both sides of the inner wall of the water purification tank 1. An electromagnet 2012 is provided in the adsorption plate 201. The first adsorption sheet 6 is connected to the opposite side of the two adsorption plates 201 respectively. A copper plate 2013 is embedded on the opposite wall of the adsorption plates 201 to separate the electromagnet 2012 and the first adsorption sheet 6. The electromagnet 2012 generates heat and conducts it outward. While the first adsorption sheet 6 adsorbs waste residue, the heat dissipates the agglomerated emulsified oil floating agglomerates.

[0048] Furthermore, the primary screen channel 2 includes a sealing shell 2011, inside which an electromagnet 2012 is inserted. A copper plate 2013 is fixedly embedded in the wall of the sealing shell 2011, allowing the electromagnet 2012 to be used in a sealed environment that does not come into contact with wastewater, thus avoiding corrosion and short circuit problems.

[0049] Furthermore, L-shaped bent plates are fixedly connected to both sides of the sealing shell 2011 to form a U-shaped first hanging plate 2014. The first adsorption sheet 6 is set as a hollow honeycomb activated carbon plate with a rectangular plate structure, which is slidably inserted into the first hanging plate 2014 from top to bottom for holding.

[0050] That is, when the wastewater passes through the two adsorption plates 201, the electromagnet 2012 is energized and works. The passing iron slag can be attracted by the magnetic force, and the iron slag will mix and stick together with the emulsified oil and soap floating matter. During the magnetic attraction process, the mixed emulsified oil floating matter will be moved together to the activated carbon plate for adsorption and adhesion. At the same time, these flowing impurities will carry the iron hydroxide slag together for adsorption and adhesion to the activated carbon plate.

[0051] However, as the adhering emulsified oil floats excessively, it easily clumps together, occupying the adsorption space for subsequent iron slag and ferric hydroxide slag. Therefore, during the energization of the electromagnet 2012, considering that the heating temperature of the electromagnet 2012 is generally between 80-150 degrees Celsius, a copper plate 2013 is used to conduct heat outward. The heat causes the adhering emulsified oil floats to heat up and melt, dispersing some of the agglomerated emulsified oil floats. These agglomerated oil floats are then carried away by the water flow on the perforated honeycomb activated carbon plate, leaving adsorption space for iron slag and ferric hydroxide slag, thus efficiently removing iron and ferric hydroxide slag from the wastewater.

[0052] In this embodiment, the secondary screen channel 3 includes a baffle 301 that is sealed at both ends and contacts the inner wall of the water treatment tank 1. The middle part of the baffle 301 is set as a mesh structure to form a water-passing mesh plate 3011. L-shaped bending plates are fixedly connected at both ends. The two bending plates form a C-shaped second hanging plate 3012 facing the primary screen channel 2. The second adsorption sheet 8 is slidably inserted into the second hanging plate 3012 from top to bottom and held in place to adsorb waste residue.

[0053] Furthermore, the second adsorption sheet 8 includes, in sequence along the direction of water flow, an adsorption cotton layer 801, an activated carbon layer 802, and a filter cotton layer 803;

[0054] The absorbent cotton layer 801 has a brushed surface 8011 on the side facing the primary screen channel 2, and several guide holes 8012 are opened on the absorbent cotton layer 801, arranged in a vertical row at intervals, which are used to filter out waste residue while allowing water to flow through quickly and reduce pressure.

[0055] Several staggered holes 8031 ​​are formed on the filter cotton layer 803, arranged vertically at intervals and offset from the guide holes 8012. This allows water to flow out through the guide holes 8012 in a staggered manner, rather than passing through the activated carbon layer 802 and being discharged directly through the staggered holes 8031. In other words, when waste residue is adsorbed and retained by the activated carbon layer 802, the water that flows out is filtered by the filter cotton layer 803, adhering to some of the waste residue, and then discharged through the staggered holes 8031, allowing the second adsorption plate 8 to efficiently adsorb the waste residue.

[0056] It should be noted that: during the process, the waste residue mixed with floating emulsion oil can be hooked onto the surface of the brushed velvet surface 8011, retaining some of the waste residue. Similarly, some of the waste residue is retained again after passing through the activated carbon layer 802, and some of the waste residue is further retained after passing through the filter cotton layer 803. This process, combined with the primary screen channel 2 of the previous stage of preliminary filtration, performs multi-stage slag screening and water purification treatment.

[0057] In this embodiment, the filtration component of the three-stage sieve channel 4 corresponding to the first-stage sieve channel 2 also includes an adsorption plate 201. The adsorption plate 201 is set as one, fixedly connected to the middle of the water purification tank 1, arranged vertically, with drainage space on both sides, and the adsorption plate is arranged facing the baffle 301, for adsorbing the residue of the secondary filtered wastewater discharged from the baffle 301.

[0058] Furthermore, the third adsorption sheet 9 is configured as a hollowed-out honeycomb activated carbon plate or a velvet cotton plate.

[0059] As described above, after the waste residue is adsorbed multiple times by the second adsorption plate 8, only a small amount of waste residue remains in the wastewater that has passed through the second adsorption plate 8. The wastewater discharged from the baffle 301 through the hollow honeycomb activated carbon plate or the velvet cotton plate is adsorbed for the residue. Then the wastewater is discharged through the drain pipe on both sides and then discharged from the drain pipe on the water treatment tank 1.

[0060] As a result, the non-solute waste residues (iron and ferric hydroxide residues) in the wastewater are efficiently filtered through multiple stages. The chemicals added in the subsequent wastewater purification process will not be consumed in large quantities. This also improves the problem of iron and ferric hydroxide residues grinding the inner walls of the system parts during flow, thereby improving the effect of subsequent degreasing wastewater treatment and reducing the difficulty of treatment.

[0061] It should be noted that the first adsorption plate 6 and the second adsorption plate 8, which mainly retain the filtered waste residue, are designed as a single unit:

[0062] The filter plate includes a T-shaped connecting piece 7, which is made of cloth or rubber. The bottom edges of the two first adsorption plates 6 are connected at both ends of the T-shaped head of the connecting piece 7 by a stitch, and the bottom edge of the middle part of the adsorption cotton layer 801 is connected at the T-shaped tail by a stitch. This allows the first adsorption plates 6 and the second adsorption plates 8 to be detached together, so that the main adsorption parts can be completely replaced without leaving one of them alone, which could lead to poor adsorption due to failure to replace one of them.

[0063] Waterway structure:

[0064] In this embodiment, the water channel structure includes: a water inlet pipe 5 connected to the side wall of the water purification tank 1, the interface of the water inlet pipe 5 being connected to the water delivery pipe 12, and wastewater being transported into the water purification tank 1.

[0065] The adsorption plate 201 in the primary screen channel 2 is set as an arc structure, with the inner sides of the two adsorption plates 201 facing each other. The two adsorption plates 201 are fixedly connected to the inner wall of the water treatment tank 1 with their heads facing the water inlet pipe 5. A collection cavity 202 is formed in the two adsorption plates 201. The collection cavity 202 includes a first inlet 203 and a first outlet 204 with gradually smaller openings along the water flow direction, which are used to discharge the wastewater filtered by the primary screen under pressure.

[0066] During the primary filtration process:

[0067] The first inlet 203 of the collection chamber 202 receives the wastewater transported by the water receiving pipe 5. The wastewater is discharged into the collection chamber 202. Because the adsorption plate 201 is set as an arc structure, the first adsorption plate 6 is arc-shaped and has a large surface area. When the wastewater passes through, it can adsorb a large amount of waste residue and discharge it under pressure through the first outlet 204 with a smaller opening.

[0068] The baffle 301 has a triangular pyramidal structure, and the second adsorption plate 8 is correspondingly set as a triangular pyramidal shape with the cone head facing the first outlet 204 to divert the depressurized wastewater flow; slag receiving chambers 302 are formed on both sides of the baffle 301, and a drainage chamber 303 is formed on the inner side of the cone at the rear of the baffle 301 for secondary screening and wastewater discharge.

[0069] During the secondary screening process:

[0070] The baffle 301 receives the high-pressure wastewater discharged from the first outlet 204. The conical structure is used to divert and depressurize the wastewater, allowing it to flow to both sides of the slag receiving chamber 302. During the water diversion process, the second adsorption plates 8 on both sides quickly adsorb the waste residue. The included angle between the two sides of the slag receiving chamber 302 will form a vortex under the water flow, continuously causing the flowing waste residue to hit the second adsorption plates 8 and then adsorb it. The wastewater filtered by the secondary screen passes through the baffle 301 and is discharged from the drainage chamber 303.

[0071] The adsorption plate 201 of the three-stage sieve channel 4 is set as an arc-shaped structure, with the outer arc surface facing the drainage cavity 303. The third adsorption plate 9 is arranged on the outer arc surface, and an arc-shaped opening 401 is formed on both sides of the third adsorption plate 9. The arc-shaped opening 401 has a passage 402 on both sides for three-stage filtration and wastewater discharge.

[0072] During the three-stage filtration process:

[0073] The arc-shaped third adsorption plate 9 of the three-stage sieve channel 4 is used to receive the depressurized wastewater from the secondary sieve filtration on a large area, and to perform magnetic adsorption of the waste residue. The water flows through the arc-shaped opening 401 for filtration and is discharged through the arc-shaped guide through the outlets 402 on both sides.

[0074] Overall, the shape and arrangement of the screen structure are designed to form a water channel structure within the water treatment tank 1, allowing for large-area pressure-boosting adsorption of waste residue. The adsorption environment is rationally designed so that the waste residue adsorbed in stages remains within the screen structure.

[0075] It should be noted that in the irregularly designed slag screening structure, waste residue tends to accumulate at the edges of the included corners. Therefore:

[0076] The water inlet pipe 5 includes a water delivery interface 501 and a bottom flushing interface 502 from top to bottom. The bottom flushing interface 502 is located at the bottom of the water treatment tank 1, and the bottom edge of the bottom flushing interface 502 is flush with the inner bottom surface of the water treatment tank 1. One end of the water delivery pipe 12 is provided with a first water inlet pipe 1201 and a second water inlet pipe 1202 in sequence corresponding to the water delivery interface 501 and the bottom flushing interface 502, and they are connected one by one to divert and transport wastewater, and water flushing is generated at the bottom of the tank.

[0077] First, the unadsorbed aggregates along the bottom edge of the arc-shaped inner side of the first adsorption plate 6 will be flushed away and sent to the secondary sieve channel 3.

[0078] An upstream guide plate 10 is fixedly connected to the outer wall of the second hanging plate 3012 at both ends of the baffle 301. The upstream guide plate 10 includes a vertical plate 1001 and a horizontal plate 1003 that are connected. One end of the horizontal plate 1003 is fixedly connected to the second hanging plate 3012 through a connecting plate. The vertical plate 1001 is spaced close to the middle of the side of the second adsorption sheet 8. The width of the vertical plate 1001 is set not to exceed half the width of the side of the second adsorption sheet 8, leaving an adsorption surface.

[0079] The horizontal plate 1003 is designed with an L-shaped structure, and a horizontal groove 1004 is formed at the bottom of the horizontal plate 1003. The vertical plate 1001 is designed with an L-shaped structure, and a vertical groove 1002 is formed on the inner side that connects to the horizontal groove 1004. Together, they form an upward guiding groove 11 that guides the waste residue upward. The bottom opening of the upward guiding groove 11 is spaced from the inner bottom surface of the water treatment tank 1, so that the waste residue that settles at the side bend angle of the second adsorption plate 8 is guided upward by the water flow to the second adsorption plate 8 for adsorption.

[0080] It should be noted that the top of the water treatment tank 1 is hinged with a sealing door 101, and the power cord of the electromagnet 2012 in each adsorption plate 201 extends to the outside through the sealing door 101 via a rubber sleeve to connect to electricity.

[0081] After flipping open the sealing door 101, the filter plate can be lifted upwards for replacement. The filter plate that has adsorbed a large amount of waste residue can be cleaned, and the water purification process can be carried out again after closing the door.

[0082] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wastewater treatment system for degreasing of color-coated coils, comprising a water purification tank (1), characterized in that: The water purification tank (1) is equipped with a sieve structure for adsorbing waste residue, and a water channel structure is formed in the water purification tank (1) in conjunction with the sieve structure, so that the waste residue adsorbed in stages remains on the sieve structure. The slag screening structure includes a primary sieve channel (2), a secondary sieve channel (3) and a tertiary sieve channel (4) in sequence along the wastewater direction. The three sieve channels are equipped with perforated filter plates for multi-stage slag removal from the wastewater. Filter plate: The magnetic heating device of the primary screen (2) is used to directly adsorb iron slag and iron hydroxide slag covered by the adhering emulsion floating matter, and the heating disperses the agglomerated emulsion floating agglomerates, leaving adsorption space for iron slag and iron hydroxide slag; the secondary screen (3) is used to completely block the waste residue for adsorption; the tertiary screen (4) is used to adsorb the residual waste residue in the wastewater. The filter plate is arranged with the first adsorption plate (6), the second adsorption plate (8) and the third adsorption plate (9) in sequence at positions corresponding to the first-stage sieve (2), the second-stage sieve (3) and the third-stage sieve (4); the first-stage sieve (2) includes two adsorption plates (201) symmetrically arranged on both sides of the inner wall of the water treatment tank (1). An electromagnet (2012) is provided in the adsorption plate (201). The first adsorption plate (6) is connected to the opposite side of the two adsorption plates (201). A copper plate (2013) is embedded on the opposite wall of the adsorption plates (201) to separate the electromagnet (2012) and the first adsorption plate (6). The electromagnet (2012) generates heat and conducts it outward. While the first adsorption plate (6) adsorbs waste residue, the heat dissipates the agglomerated emulsion oil floating agglomerates.

2. The wastewater treatment system for degreasing of color-coated coils according to claim 1, characterized in that: The primary screen channel (2) includes a sealing shell (2011), inside which a discharge magnet (2012) is inserted, and a copper plate (2013) is fixedly embedded in the wall of the sealing shell (2011).

3. The wastewater treatment system for degreasing of color-coated coils according to claim 2, characterized in that: The sealing shell (2011) has L-shaped bent plates fixedly connected to both sides of its edge to form a C-shaped first hanging plate (2014). The first adsorption sheet (6) is set as a hollow honeycomb activated carbon plate with a rectangular plate structure, which is slidably inserted into the first hanging plate (2014) from top to bottom for holding.

4. The wastewater treatment system for degreasing of color-coated coils according to claim 3, characterized in that: The secondary screen channel (3) includes a baffle (301) that is sealed at both ends and contacts the inner wall of the water treatment tank (1). The middle part of the baffle (301) is set as a mesh structure to form a water-passing mesh plate (3011). L-shaped bending plates are fixedly connected at both ends. The two bending plates form a c-shaped second hanging plate (3012) facing the primary screen channel (2). The second adsorption sheet (8) is slidably inserted into the second hanging plate (3012) from top to bottom and held in place.

5. The wastewater treatment system for degreasing of color-coated coils according to claim 4, characterized in that: The second adsorption sheet (8) includes, in sequence along the direction of water flow, an adsorption cotton layer (801), an activated carbon layer (802), and a filter cotton layer (803). The absorbent cotton layer (801) has a brushed surface (8011) on the side facing the primary sieve channel (2), and several guide holes (8012) are opened on the absorbent cotton layer (801) in a vertically spaced arrangement. Several staggered holes (8031) are opened on the filter cotton layer (803), arranged vertically at intervals, and staggered from the position of the guide hole (8012), so that when the water flows out through the guide hole (8012), the water flows out in a staggered manner.

6. The wastewater treatment system for degreasing of color-coated coils according to claim 4, characterized in that: The filtration component of the three-stage sieve channel (4) corresponding to the first-stage sieve channel (2) also includes the adsorption plate (201), and the adsorption plate (201) is set as one, fixedly connected to the middle of the water purification tank (1), arranged vertically, with drainage space on both sides, and the adsorption plate surface facing the baffle (301).

7. The wastewater treatment system for degreasing of color-coated coils according to claim 6, characterized in that: The filter plate includes a T-shaped connecting piece (7), which is a cloth or rubber sheet. The bottom edges of two first adsorption sheets (6) are connected at both ends of the T-shaped head of the connecting piece (7) by a stitch, and the bottom edge of the middle part of the adsorption cotton layer (801) is connected at the T-shaped tail of the connecting piece (7) by a stitch.

8. The wastewater treatment system for degreasing of color-coated steel rolls according to any one of claims 1-7, characterized in that: The waterway structure includes: a water inlet pipe (5) connected to the side wall of the water purification tank (1), and the interface of the water inlet pipe (5) is connected to the water delivery pipe (12). The adsorption plate (201) in the primary screen channel (2) is set as an arc structure, with the inner sides of the two adsorption plates (201) facing each other, and the two adsorption plates (201) are fixedly connected to the inner wall of the water treatment tank (1) with their heads facing the water pipe (5). A gathering cavity (202) is formed in the two adsorption plates (201). The gathering cavity (202) includes a first inlet (203) and a first outlet (204) with gradually smaller openings along the water flow direction. The baffle (301) has a triangular pyramidal structure, and the second adsorption plate (8) is correspondingly set as a triangular pyramidal shape with the cone head facing the first outlet (204) to divert the depressurized wastewater flow; slag receiving chambers (302) are formed on both sides of the baffle (301), and a drainage chamber (303) is formed on the inner side of the cone at the rear of the baffle (301). The adsorption plate (201) of the three-stage sieve channel (4) is set as an arc structure, and the outer arc surface faces the drainage cavity (303). The third adsorption plate (9) is arranged on the outer arc surface, and an arc-shaped opening (401) is formed on both sides of the third adsorption plate (9). The arc-shaped opening (401) has a passage (402) on both sides. The water inlet pipe (5) includes a water delivery interface (501) and a bottom flushing interface (502) from top to bottom. The bottom flushing interface (502) is located at the bottom of the water purification tank (1), and the bottom edge of the bottom flushing interface (502) is flush with the inner bottom surface of the water purification tank (1). One end of the water delivery pipe (12) is provided with a first water inlet pipe (1201) and a second water inlet pipe (1202) in sequence corresponding to the water delivery interface (501) and the bottom flushing interface (502). Upstream guide plates (10) are fixedly connected to the outer walls of the second hanging plates (3012) at both ends of the baffle (301). The upstream guide plate (10) includes a vertical plate (1001) and a horizontal plate (1003) that are connected. One end of the horizontal plate (1003) is fixedly connected to the second hanging plate (3012) through a connecting plate. The vertical plate (1001) is spaced close to the middle of the side of the second adsorption sheet (8), and the width of the vertical plate (1001) is not more than half the width of the side of the second adsorption sheet (8). The horizontal plate (1003) is configured as an L-shaped structure, and a horizontal groove (1004) is formed at the bottom of the horizontal plate (1003). The vertical plate (1001) is configured as an L-shaped structure, and a vertical groove (1002) is formed on the inner side that connects to the horizontal groove (1004), together forming an upward flow guide groove (11) that guides the waste slag upward.

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