Treatment process of photovoltaic slicing wastewater

Abstract

The invention relates to the technical field of photovoltaic slicing wastewater treatment, and particularly discloses a photovoltaic slicing wastewater treatment process which comprises the following steps: S1, collecting wastewater generated in a production workshop into a filter pressing biochemical system for centralized treatment; according to the vortex formed when wastewater tangentially enters the filtering tank, particles, suspended solids and the like in the wastewater are thrown to the inner wall of the filtering tank under the action of centrifugal force, so that direct contact between the particles and a filter element can be reduced, the filter element is effectively prevented from being washed by the particles under the impact of the wastewater, and the surface of the filter element is prevented from being damaged; therefore, the service life of the filter element is prevented from being shortened, particles are prevented from penetrating through the filter element to damage an ultrafiltration membrane in an ultrafiltration membrane system and entering a subsequent nanofiltration system, and when wastewater is subjected to nanofiltration and the concentration of silicon and fluorine on the concentrated water side of the membrane is enriched, precipitation is prevented from being formed on the surface of the membrane, the membrane blockage phenomenon is prevented from being caused, and the service life of the membrane is prevented from being greatly shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic slicing wastewater treatment, and in particular relates to a photovoltaic slicing wastewater treatment process. Background Art

[0002] The wastewater generated during the photovoltaic slicing process contains a large amount of silicon powder and organic matter from the cutting process. Direct discharge damages the ecological environment. The usual treatment method is to remove suspended matter through sedimentation / filter pressing, and then reduce pollution factors such as COD through biochemical processes before discharging. Traditional processes can only achieve external treatment, and a large amount of water resources cannot be recycled but enters the downstream sewage treatment plant as wastewater. A large amount of sewage discharge costs and tap water purchase costs are inevitable every year. Therefore, a technical solution that can recycle, purify and reuse wastewater is eagerly awaited by photovoltaic slicing companies.

[0003] Water treatment purification and recycling technology can be treated by membrane method, using filters, ultrafiltration membranes, nanofiltration membranes, etc. to filter wastewater to obtain pure water that can be recycled. However, due to the presence of a large amount of debris and particles in photovoltaic slicing wastewater, some larger debris and particles are easily washed away by the impact of water on the filter element surface, resulting in damage to the filter element surface. This will not only reduce the service life of the filter element, but also reduce the filtering effect of the filter element. Some debris and particles will enter the subsequent nanofiltration system. Due to the presence of calcium ions, silicon ions and fluoride ions in the wastewater, when the wastewater is nanofiltered, the concentration of silicon and fluorine on the concentrated water side of the membrane is enriched, and precipitation is formed on the membrane surface, causing membrane blockage and greatly reducing the service life of the membrane. Summary of the invention

[0004] The purpose of the present invention is to provide a treatment process for photovoltaic slicing wastewater in view of the shortcomings of the prior art, so as to solve the technical problem that larger debris and particles in the prior art are easily washed away by the filter element surface under the impact of water, thereby causing damage to the filter element surface, which not only reduces the service life of the filter element, but also reduces the filtering effect of the filter element.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A photovoltaic slicing wastewater treatment process comprises the following steps: Step S1: The cutting fluid wastewater, degumming fluid wastewater generated in the production workshop, the backwash water and ROR concentrated water generated in the power workshop, and the domestic sewage in the factory area are collected into the filter press biochemical system for centralized treatment; Step S2: The filter press biochemical system uses the Fenton advanced oxidation process to remove the refractory organic pollutants in the photovoltaic slicing wastewater; Step S3: passing the produced water of the filter press biochemical system into the filter tank, and filtering out large particles and suspended matter in the produced water through the filter element; Step S4: The filtered large particles and suspended solids are collected by the collecting mechanism 1 and the collecting mechanism 2, and discharged into the sewage pipe through the sewage pipe 1 and the sewage pipe 2, and finally enter the sewage well. The concentrated water is discharged into the concentrated water outlet pipe through the concentrated water discharge pipe, and finally enters the sewage well. Step S5: The filtered water enters the ultrafiltration membrane system through the water pipe, and 0.3-1ppm sodium hypochlorite is added to the filtered water to further filter out fine particles and fine suspended matter in the water; Step S6: The ultrafiltration water enters the decalcification nanofiltration system through the water pipe, the pH of the ultrafiltration water environment is controlled within the range of 4-7, and the decalcification nanofiltration system separates and removes calcium ions in the water; Step S7: The decalcified water enters the desiliconization nanofiltration system, and the pH value of the decalcified water environment is increased to 7-10. The desiliconization nanofiltration system separates silicon ions and fluoride ions in the water, and finally the water is discharged from the pure water outlet pipe for recycling.

[0006] A photovoltaic slicing wastewater treatment device, the device applies a photovoltaic slicing wastewater treatment process as described above, and the device comprises: A filter tank, wherein the filter tank is connected with a water inlet pipe, the water inlet pipe is connected with the filter press biochemical system, and the water inlet pipe is tangent to the filter tank; A filter element, the filter element being rotatably mounted in the filter tank; A collecting mechanism 1 and a collecting mechanism 2 are installed in the filter tank from top to bottom, respectively. The collecting mechanism 1 and the collecting mechanism 2 are located outside the filter element and are used to collect particles and suspended matter in the water. Cleaning brushes, a plurality of cleaning brushes are installed in the collecting mechanism 1, and the cleaning brushes are in contact with the surface of the filter element; Cleaning mechanism: a plurality of cleaning mechanisms are installed on the inner wall of the filter tank, and the cleaning mechanism is located between the first collecting mechanism and the second collecting mechanism; A drain pipe is installed at the bottom end of the filter tank, and a connecting pipe is provided at the bottom end of the filter element, and the connecting pipe is movably connected to the drain pipe.

[0007] As a preferred embodiment of the above technical solution, an elastic telescopic part is provided at the top of the filter element, and the top of the elastic telescopic part is rotatably connected to the top of the inner cavity of the filter tank. A plurality of inclined driving plates are provided on the top of the filter element, and the inclination direction of the driving plates is the same as the water inlet direction from the water inlet pipe.

[0008] As a preferred embodiment of the above technical solution, the structures of the collecting mechanism 1 and the collecting mechanism 2 are the same, and the collecting mechanism 1 and the collecting mechanism 2 include: A collecting box, the collecting box is annular, the collecting box is located outside the filter element and does not contact the filter element, and an annular cavity is opened in the collecting box; Inclined plate 1 and inclined plate 2, the top of the collection box is provided with an annular inclined plate 1 near the inner side of the filter tank, and the inner wall of the filter tank is provided with an annular inclined plate 2, the inclined plate 2 and the inclined plate 1 are inclined in opposite directions, and a channel is formed between the inclined plate 2 and the inclined plate 1 for particles or suspended matter to enter the collection box; A main scraper is installed in the cavity.

[0009] As a preferred embodiment of the above technical solution, the top end of the collection box and the bottom end of the cavity are both inclined, and the inclination direction thereof is downwardly inclined toward the inner wall of the filter tank.

[0010] As a preferred embodiment of the above technical solution, the main scraper is in an inclined state, and its inclination direction is toward the rotation direction of the filter element. A connecting rod is connected to the main scraper, and a connecting plate is installed on the filter element. The connecting rod and the connecting plate are slidably connected up and down, and an auxiliary scraper is arranged on the connecting rod, and the auxiliary scraper is in contact with the top of the collecting box.

[0011] As a preferred embodiment of the above technical solution, a sealing ring is provided on the main scraper, and the sealing ring is an incomplete ring. A gap is formed between the end of the sealing ring and the main scraper, and the positions corresponding to the collecting mechanism one and the collecting mechanism two on the filter tank are respectively connected with the sewage pipe one and the sewage pipe two. The two sealing rings are respectively used to seal the sewage pipe one and the sewage pipe two, and the gap part makes the sewage pipe one and the sewage pipe two open.

[0012] As a preferred embodiment of the above technical solution, the cleaning brush is fixed on the inner side of the collecting box, and the cleaning brush is spiral-shaped, and its spiral direction is opposite to the rotation direction of the filter element.

[0013] As a preferred embodiment of the above technical solution, the cleaning mechanism includes: A material discharge box, the material discharge box is fixed on the inner wall of the filter tank, and the material discharge box is directly facing the channel formed between the inclined plate 1 and the inclined plate 2; A guide tube, the feed box is connected with the guide tube; A cleaning box, the other end of the guide tube is connected to a cleaning box, a cleaning scraper is arranged on the cleaning box, the cleaning scraper, a cylindrical flow channel is inside the cleaning box, a feed hole is tangently opened at the connecting part of the cleaning box and the cleaning scraper, and the feed holes on the cleaning boxes are distributed one by one from top to bottom in the order of arrangement.

[0014] The beneficial effects of the present invention are: 1. In the present invention, the vortex formed by the wastewater entering the filter tank through the tangent line, due to the effect of centrifugal force, the particles and suspended matter in the wastewater are thrown to the inner wall of the filter tank, which can reduce the direct contact between the particles and the filter element, effectively avoid the particles from scouring the filter element under the impact of the wastewater, avoid the damage to the surface of the filter element, thereby avoid reducing the service life of the filter element, avoid particles from passing through the filter element to damage the ultrafiltration membrane in the ultrafiltration membrane system and enter the subsequent nanofiltration system, and avoid the concentration of silicon and fluorine on the concentrated water side of the membrane when the wastewater is nanofiltered, avoid the formation of precipitation on the membrane surface, avoid membrane clogging, and avoid a significant reduction in the service life of the membrane; 2. In the present invention, the particles and suspended solids are collected and discharged by the collecting mechanism 1 and the collecting mechanism 2, which reduces the probability of particles contacting the filter element, thereby effectively avoiding damage to the surface of the filter element, and ensuring continuous filtration of the filter element, thus extending the cleaning cycle of the filter element and reducing maintenance costs; 3. In the present invention, the treatment of slicing wastewater is achieved by filter element filtration plus three-stage nanofiltration membrane technology. The reuse amount of slicing wastewater is increased by adding filter element filtration, ultrafiltration and two-stage nanofiltration after the filter press biochemical system, which reduces the amount of tap water purchased by the enterprise and realizes the transformation of waste into treasure. The present invention needs to perform filter element filtration, ultrafiltration, calcium removal nanofiltration and silicon removal nanofiltration separately because the water quality of slicing wastewater is complex (containing impurities such as particulate matter, calcium salts, silicon and fluorine), and it needs to be processed step by step. In addition, the sequential coordination of filter element filtration and the three membranes will improve the removal efficiency of the membrane. The filter element intercepts a large number of larger particles and suspended matter in the wastewater to ensure that the ultrafiltration membrane surface will not be scratched or blocked by larger particles. The ultrafiltration is a two-stage nanofiltration that intercepts smaller particles and suspended matter to ensure that the two-stage nanofiltration membrane surface will not be scratched or blocked by smaller particles. The calcium removal nanofiltration can intercept calcium ions to avoid the formation of precipitation on the membrane surface when the concentration of silicon and fluorine on the concentrated water side of the membrane is enriched in the last step of silicon removal and fluorine removal nanofiltration, causing membrane blockage and greatly shortening the service life of the membrane. The silicon removal nanofiltration intercepts anions such as silicate ions and fluoride ions to achieve pure reuse of the final produced water. The combined use of the three membranes of the present invention can extend the service life of the membrane while enhancing the purification capacity of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the process flow chart; Figure 2 This is a schematic diagram of the internal structure of the filter tank; Figure 3 A schematic diagram of the pipeline structure connected to the filter tank; Figure 4 It is a schematic diagram of the cross-sectional structure of the filter tank; Figure 5 for Figure 4 The enlarged structural diagram at A in the middle; Figure 6It is a schematic diagram of the collection mechanism structure; Figure 7 It is a schematic diagram of the partial structure of the collection mechanism; Figure 8 It is a schematic diagram of the scraper structure; Fig. 9 It is a schematic diagram of the cleaning mechanism structure; Fig.10 Schematic diagram of the distribution structure of the feed holes on each cleaning box.

[0016] In the figure: 1. Filter tank; 2. Water inlet pipe; 3. Drain pipe; 4. Drain pipe; 5. Filter element; 51. Drive plate; 52. Elastic expansion member; 53. Connecting pipe; 54. Connecting plate; 6. Collecting mechanism 1; 7. Collecting mechanism 2; 8. Collecting box; 81. Cavity; 82. Inclined plate 1; 83. Inclined plate 2; 9. Main scraper; 91. Connecting rod; 92. Blocking ring; 93. Auxiliary scraper; 10. Cleaning brush; 11 , cleaning mechanism; 111, discharge box; 112, guide tube; 113, cleaning box; 114, feed hole; 115, cleaning scraper; 12, sewage pipe one; 13, sewage pipe two; 14, filter press biochemical system; 15, calcium removal nanofiltration system; 16, silicon removal nanofiltration system; 17, water pipeline; 18, pure water outlet pipeline; 19, concentrated water outlet pipeline; 20, sewage pipeline; 21, ultrafiltration membrane system. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1-Figure 10 As shown, a photovoltaic slicing wastewater treatment process includes the following steps: Step S1: The cutting fluid wastewater, degumming fluid wastewater generated in the production workshop, the backwash water and ROR concentrated water generated in the power workshop, and the domestic sewage in the factory area are collected into the filter press biochemical system 14 for centralized treatment; Step S2: the filter press biochemical system 14 uses the Fenton advanced oxidation process to remove the refractory organic pollutants in the photovoltaic slicing wastewater; Step S3: passing the produced water from the filter press biochemical system 14 into the filter tank 1, and filtering out large particles and suspended matter in the produced water through the filter element 5; Step S4: The filtered large particles and suspended solids are collected by the collecting mechanism 1 6 and the collecting mechanism 2 7, and discharged into the sewage pipe 20 through the sewage pipe 1 12 and the sewage pipe 2 13, and finally enter the sewage well. The concentrated water produced is discharged into the concentrated water outlet pipe 19 through the concentrated water discharge pipe 4, and finally enters the sewage well; Step S5: The filtered water enters the ultrafiltration membrane system 21 through the water pipe 17, and 0.3-1 ppm sodium hypochlorite is added to the filtered water to further filter out fine particles and fine suspended matter in the water; Step S6: The ultrafiltration water enters the decalcification nanofiltration system 15 through the water pipe 17, and the pH of the ultrafiltration water environment is controlled within the range of 4-7. The decalcification nanofiltration system 15 separates and removes calcium ions in the water; Step S7: The decalcified water enters the desiliconization nanofiltration system 16, and the pH value of the decalcified water environment is increased to 7-10. The desiliconization nanofiltration system 16 separates silicon ions and fluoride ions in the water, and finally discharges the water from the pure water outlet pipe 18 for recycling.

[0019] First of all, it should be explained that the essence of Fenton's advanced oxidation process is that the chain reaction between divalent iron ions (Fe2+) and hydrogen peroxide catalyzes the generation of hydroxyl radicals, and utilizes the strong oxidizing ability of hydroxyl radicals to oxidize organic compounds such as carboxylic acids, alcohols, and esters into inorganic states, thereby removing difficult-to-degrade organic pollutants. The ultrafiltration membrane separation in the ultrafiltration membrane system 21 is between nanofiltration and microfiltration, with a pore size range of 0.001-0.05μm. The ultrafiltration membrane is porous and has an asymmetric structure. The thickness of the top layer is 1.0-3.0μm, and the pore size is larger than that of nanofiltration and reverse osmosis membranes. The working pressure is low, and it is used to remove fine particles and suspended matter in the effluent of the biochemical system within the range of 2-5bar. The ultrafiltration membrane in the ultrafiltration membrane system 21 intercepts fine particles and suspended matter (including colloids), and effectively inhibits the clogging problem of biological slime by adding not less than 0.3ppm of sodium hypochlorite to the inlet side of the ultrafiltration membrane system 21. In addition, the frequent fast flushing of the ultrafiltration membrane system 21 is limited, requiring a fast flushing of 1-3 minutes every 30-120 minutes of operation, and the flushing water contains 50-100ppm of sodium hypochlorite. Calcium removal nanofiltration system 15, in which calcium and silicon, calcium and fluorine, which are the most risky in the composite pollutants, need to be separated. The conventional process of direct reverse osmosis membrane purification can easily fail due to clogging problems at this stage. Nanofiltration requires lower working pressure and energy consumption than reverse osmosis, and has higher water permeability, which can save electricity consumption for enterprises and increase water production rate. Nanofiltration removes pollutants and ions from water as a result of the combined action of multiple phenomena, such as steric hindrance, Donen effect and electrostatic effect. The calcium removal nanofiltration membrane used in the present invention can adsorb divalent cations on its surface and thus change the charge density on the membrane surface. The mechanism is that the net membrane charge on the surface is protonated by the functional groups. The amide groups on the membrane surface help to selectively screen calcium ions. Under acidic conditions (low pH, pH <5.5), the amide groups are mostly in protonated form. The formula ([R−NH2]+[H3O]⇌[R−NH+3+]) is conducive to the separation of calcium ions. Anions such as silicate, metasilicate and fluoride are more inclined to combine with hydrogen ions to form neutral molecules in an environment where the pH is less than 7. In the screening mechanism of the nanofiltration membrane, the selective characteristics of charge repulsion can be used to allow neutral ions to pass through, thereby achieving the ability to separate calcium from silicate ions and fluoride ions. That is, after entering the calcium removal nanofiltration system 15, by controlling the pH of the water environment within the range of 4-7, the surface of the nanofiltration membrane in the calcium removal nanofiltration system 15 is mainly positively charged, thereby improving the removal of cations such as calcium ions and reducing the interception of silicon, thereby separating calcium and silicon, and calcium ions enter the discharged concentrated water, while silicon mainly enters the silicon removal nanofiltration system 16, thereby reducing the occurrence of calcium silicate blockage. In the silicon removal nanofiltration system 16, by increasing the pH in the water environment to 7-10, the surface of the nanofiltration membrane in the silicon removal nanofiltration system 16 is mainly negatively charged, and anions such as silicate ions and fluoride ions are fully intercepted, so that the removal rate of fluoride ions is always above 99.33%, thereby achieving efficient purification of wastewater; the concentrated water of the silicon removal nanofiltration system 16 contains only ions and no particulate matter, and is used to flush the filter tank 1 and the ultrafiltration membrane system 21, thereby reducing the amount of wastewater discharged; In addition, the ultrafiltration membrane in the ultrafiltration membrane system 21 used here is made of one or a composite of polysulfone, polyethersulfone, sulfonated polysulfone, polyvinylidene fluoride, polytetrafluoroethylene, polyaniline, and polyvinyl nitrile, and the nanofiltration membrane in the calcium removal nanofiltration system 15 and the silicon removal nanofiltration system 16 used here is made of polyamide material or amphoteric polymer material, with chemical groups such as amino, carboxyl, and sulfonic acid groups attached to the surface, which can present a positive charge in an acidic environment and a negative charge in an alkaline environment; Finally, the fluorine content of the outlet water from the pure water outlet pipe 18 is stably <1ppm, the fluorine removal rate is above 99.33%, and the silicon content of the outlet water is stably <2ppm.

[0020] like Figure 2-Figure 4As shown, a photovoltaic slicing wastewater treatment device, the device applies a photovoltaic slicing wastewater treatment process as described above, and the device includes: A filter tank 1, the filter tank 1 is connected with a water inlet pipe 2, the water inlet pipe 2 is connected with a filter press biochemical system 14, and the water inlet pipe 2 is tangent to the filter tank 1; A filter element 5, the filter element 5 is rotatably mounted in the filter tank 1; The collecting mechanism 1 6 and the collecting mechanism 2 7 are respectively installed in the filter tank 1 from top to bottom. The collecting mechanism 1 6 and the collecting mechanism 2 7 are located outside the filter element 5 and are used to collect particles and suspended matter in the water; Cleaning brush 10: A plurality of cleaning brushes 10 are installed in the collecting mechanism 1 6, and the cleaning brushes 10 are in contact with the surface of the filter element 5; Cleaning mechanism 11: a plurality of cleaning mechanisms 11 are installed on the inner wall of the filter tank 1, and the cleaning mechanism 11 is located between the collecting mechanism 1 6 and the collecting mechanism 2 7; Drain pipe 3: A drain pipe 3 is installed at the bottom end of the filter tank 1, and a connecting pipe 53 is provided at the bottom end of the filter element 5. The connecting pipe 53 is movably connected to the drain pipe 3.

[0021] Furthermore, an elastic telescopic member 52 is provided at the top of the filter element 5, and the top of the elastic telescopic member 52 is rotatably connected to the top of the inner cavity of the filter tank 1. A plurality of inclined driving plates 51 are provided at the top of the filter element 5, and the inclination direction of the driving plates 51 is the same as the water inlet direction from the water inlet pipe 2.

[0022] In one case of this embodiment, the elastic telescopic member 52 may be an elastically telescopic sleeve rod, or may be other elastically telescopic components.

[0023] In actual application of this embodiment, wastewater enters the filter tank 1 in a tangential state through the water inlet pipe 2. Due to the presence of a certain pressure in the wastewater, the wastewater presents a spiral state after entering the filter tank 1. Due to the effect of centrifugal force, the particles and suspended matter in the wastewater are thrown toward the inner wall of the filter tank 1. This can reduce the direct contact between the particles and the filter element 5, and effectively avoid the particles from scouring the filter element 5 under the impact of the wastewater, causing damage to the surface of the filter element 5, thereby reducing the service life of the filter element 5, and avoiding particles from passing through the filter element 5 to damage the ultrafiltration membrane in the ultrafiltration membrane system 21 and entering the subsequent nanofiltration system, and avoiding the formation of precipitation on the membrane surface when the concentration of silicon and fluorine on the concentrated water side of the membrane is enriched when the wastewater is nanofiltered. , to avoid membrane clogging and greatly shortening the service life of the membrane; at the same time, particles and suspended matter are thrown toward the inner wall of the filter tank 1. Due to their own weight, the particles and suspended matter will slowly move downward and eventually enter the collecting mechanism 1 6 and the collecting mechanism 2 7 for centralized collection, effectively avoiding the presence of a large number of particles and suspended matter in the filter tank 1 and reducing the water flow through the filter element 5; in addition, most of the particles directly enter the collecting mechanism 1 6 and the collecting mechanism 2 7, thus reducing the probability of particles contacting the filter element 5, thereby effectively avoiding damage to the surface of the filter element 5, and ensuring continuous filtration of the filter element 5, thus extending the cleaning cycle of the filter element 5 and reducing maintenance costs; Due to the existence of the driving plate 51, the wastewater will impact the driving plate 51 after entering the filter tank 1, so that the driving plate 51 drives the filter element 5 to rotate, so that the particles and suspended matter attached to the surface of the filter element 5 can be thrown off, effectively preventing the particles and suspended matter from clogging the filter element 5, thereby preventing the filtering effect of the filter element 5 from being reduced; in addition, since the driving plate 51 is in an inclined state, the driving plate 51 will move downward under the impact of the wastewater, thereby driving the filter element 5 to move downward, and with the elastic expansion and contraction of the elastic expansion member 52, the water pressure of the wastewater entering the filter tank 1 is intermittently controlled, so that the filter element 5 can reciprocate up and down while rotating, so that the particles and suspended matter attached to the surface of the filter element 5 can be further thrown off, effectively preventing the particles and suspended matter from clogging the filter element 5, thereby preventing the filtering effect of the filter element 5 from being reduced, and at the same time, it is also effective to prevent the particles from damaging the filter element 5; In addition, the filter element 5 reciprocates up and down while rotating, and the cleaning brush 10 can be used to clean off particles and suspended matter attached to the surface of the filter element 5, effectively preventing particles and suspended matter from attaching to the filter element 5 and reducing the filtering effect of the filter element 5, while also preventing particles from damaging the filter element 5; the cleaning brush 10 directly sweeps off particles and suspended matter, effectively preventing these cleaned and thrown off particles and suspended matter from attaching to the filter element 5 again.

[0024] like Figure 2-Figure 8 As shown, the structures of the collecting mechanism 1 6 and the collecting mechanism 2 7 are the same, and the collecting mechanism 1 6 and the collecting mechanism 2 7 include: The collecting box 8 is annular and is located outside the filter element 5 and does not contact the filter element 5. An annular cavity 81 is provided in the collecting box 8; Inclined plate 1 82 and inclined plate 2 83, a circular inclined plate 1 82 is arranged on the top of the collecting box 8 near the inner side of the filter tank 1, and an annular inclined plate 2 83 is arranged on the inner wall of the filter tank 1, the inclined plate 2 83 and the inclined plate 1 82 are inclined in opposite directions, and a channel is formed between the inclined plate 2 83 and the inclined plate 1 82 for particles or suspended matter to enter the collecting box 8; Main scraper 9: A main scraper 9 is installed in the cavity 81.

[0025] In actual application of this embodiment, particles and suspended matter enter the collection box 8 through the channel between the inclined plate 1 82 and the inclined plate 2 83, and the particles and suspended matter are collected in a centralized manner by the collection box 8, thereby effectively preventing these particles and suspended matter from adhering to the surface of the filter element 5 again, and effectively preventing the particles from damaging the filter element 5.

[0026] Furthermore, the top end of the collecting box 8 and the bottom end of the cavity 81 are both in an inclined state, and the inclination direction thereof is downwardly inclined toward the inner wall of the filter tank 1 .

[0027] In actual application of this embodiment, the inclination of the top end of the collecting box 8 can facilitate the particles and suspended matter to slide into the collecting box 8, and the inclination of the bottom end of the cavity 81 can make the particles and suspended matter in the collecting box 8 close to the inner wall of the filter tank 1, so as to facilitate discharge from the sewage pipe 1 12 and the sewage pipe 2 13.

[0028] Furthermore, the main scraper 9 is in an inclined state, and its inclination direction is toward the rotation direction of the filter element 5. A connecting rod 91 is connected to the main scraper 9, and a connecting plate 54 is installed on the filter element 5. The connecting rod 91 and the connecting plate 54 are connected by sliding up and down. An auxiliary scraper 93 is arranged on the connecting rod 91, and the auxiliary scraper 93 is in contact with the top of the collecting box 8.

[0029] In actual application of this embodiment, when the filter element 5 rotates, the connecting rod 91 is driven to rotate through the connecting plate 54, so that the connecting rod 91 drives the main scraper 9 to rotate around the filter element 5, and the main scraper 9 scrapes the particles and suspended matter collected in the cavity 81 to move, so that the particles and suspended matter slowly approach the sewage pipe 1 12 and the sewage pipe 2 13, so as to facilitate the discharge of the particles and suspended matter; in addition, the auxiliary scraper 93 rotates at the top of the collecting box 8, and the particles and suspended matter at the top of the collecting box 8 can be hung into the collecting box 8, so as to improve the collection effect; in addition, the connecting rod 91 and the connecting plate 54 slide up and down, so that when the filter element 5 moves up and down, the position of the main scraper 9 will not change.

[0030] Furthermore, a blocking ring 92 is provided on the main scraper 9. The blocking ring 92 is an incomplete ring. A gap is formed between the end of the blocking ring 92 and the main scraper 9. The positions corresponding to the collecting mechanism 1 6 and the collecting mechanism 2 7 on the filter tank 1 are respectively penetrated by a sewage pipe 12 and a sewage pipe 2 13. The two blocking rings 92 are respectively used to block the sewage pipe 1 12 and the sewage pipe 2 13, and the gap portion allows the sewage pipe 12 and the sewage pipe 2 13 to be opened.

[0031] In actual application of this embodiment, the main scraper 9 scrapes the particles and suspended matter in the cavity 81, and drives the particles and suspended matter to rotate around the filter element 5. After the rotation, when the gap between the blocking ring 92 and the main scraper 9 coincides with the sewage pipe 1 12 or the sewage pipe 2 13, the particles and suspended matter enter the sewage pipe 1 12 or the sewage pipe 2 13 and are discharged; Both the sewage pipe 12 and the sewage pipe 2 13 are tangent to the filter tank 1, which makes it convenient for particles and suspended matter to enter the sewage pipe 12 and the sewage pipe 2 13 and be discharged, thereby improving the processing efficiency of particles and suspended matter, thereby effectively preventing particles from contacting the filter element 5 and damaging the filter element 5.

[0032] like Figure 2 and Figure 6 As shown, the cleaning brush 10 is fixed on the inner side of the collecting box 8 , and the cleaning brush 10 is spiral-shaped, and its spiral direction is opposite to the rotation direction of the filter element 5 .

[0033] In actual application of this embodiment, when the filter element 5 rotates, the particles and suspended matter attached to the surface of the filter element 5 will be scraped off by the cleaning brush 10, and move along the spiral trajectory of the cleaning brush 10, and finally move to the top of the collection box 8, and are scraped into the collection box 8 through the auxiliary scraper 93, thereby improving the collection efficiency of particles and suspended matter, thereby effectively preventing particles from contacting the filter element 5 and damaging the filter element 5.

[0034] like Figure 7-Figure 10 As shown, the cleaning mechanism 11 includes: A material box 111 is fixed on the inner wall of the filter tank 1, and the material box 111 faces the channel formed between the inclined plate 1 82 and the inclined plate 2 83; A guide tube 112 is connected to the material box 111; A cleaning box 113 is provided, and the other end of the guide tube 112 is connected to the cleaning box 113, and a cleaning scraper 115 is provided on the cleaning box 113. The cleaning scraper 115 has a cylindrical flow channel inside the cleaning box 113, and a feed hole 114 is tangently provided at the connecting portion of the cleaning box 113 and the cleaning scraper 115. The feed holes 114 on the cleaning boxes 113 are distributed one by one from top to bottom in the order of arrangement.

[0035] It should be noted that after the wastewater enters the filter tank 1, most of the particles and suspended matter enter the collection box 8 in the collection mechanism 1 6, while a small number of small particles and small suspended matter will slowly move to the bottom of the collection mechanism 1 6, and at this time they need to be collected by the collection mechanism 2 7.

[0036] In actual application of this embodiment, a part of the small particles and small suspended matter slowly move to the top of the collecting box 8 in the collecting mechanism 2 7 due to their own weight, and slowly enter the cavity 81, while the other part of the small particles and small suspended matter may adhere to the surface of the filter element 5. At this time, the small particles and small suspended matter attached to the surface of the filter element 5 can be scraped off by the cleaning scraper 115 on the cleaning box 113, and enter the cleaning box 113 through the feed hole 114, and finally enter the collecting box 8 through the guide tube 112 and the discharge box 111. In this way, the small particles and small suspended matter can be collected and processed in a centralized manner. In conjunction with the collecting mechanism 1 6, most of the particles and suspended matter in the wastewater can be collected and discharged in a centralized manner, effectively preventing the particles from contacting the filter element 5 and damaging the filter element 5, while also ensuring the filtration efficiency of the filter element 5 and the water flow rate.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A photovoltaic slicing wastewater treatment process, characterized in that: The following steps are involved: Step S1: The cutting fluid wastewater, degumming fluid wastewater generated in the production workshop, the backwash water and ROR concentrated water generated in the power workshop, and the domestic sewage in the factory area are collected into the filter press biochemical system (14) for centralized treatment; Step S2: The filter press biochemical system (14) uses the Fenton advanced oxidation process to remove the refractory organic pollutants in the photovoltaic chip wastewater; Step S3: passing the produced water from the filter press biochemical system (14) into the filter tank (1), and filtering out large particles and suspended matter in the produced water through the filter element (5); Step S4: The filtered large particles and suspended solids are collected by the collecting mechanism 1 (6) and the collecting mechanism 2 (7), and discharged into the sewage pipe (20) through the sewage pipe 1 (12) and the sewage pipe 2 (13), and finally enter the sewage well. The concentrated water generated is discharged into the concentrated water outlet pipe (19) through the concentrated water discharge pipe (4), and finally enters the sewage well. Step S5: the filtered water enters the ultrafiltration membrane system (21) through the water pipe (17), 0.3-1 ppm sodium hypochlorite is added to the filtered water to further filter out fine particles and fine suspended matter in the water; Step S6: the ultrafiltration water enters the calcium removal nanofiltration system (15) through the water pipe (17), the pH of the ultrafiltration water environment is controlled within the range of 4-7, and the calcium removal nanofiltration system (15) separates and removes calcium ions in the water; Step S7: The decalcified water is fed into the desiliconization nanofiltration system (16) to raise the pH of the decalcified water environment to 7-10. The desiliconization nanofiltration system (16) separates silicon ions and fluoride ions in the water. Finally, the water is discharged from the pure water outlet pipe (18) for recycling.

2. A photovoltaic slicing wastewater treatment device, characterized in that: The device applies a photovoltaic slicing wastewater treatment process as described in claim 1 above, and the device comprises: A filter tank (1), wherein the filter tank (1) is connected to a water inlet pipe (2), the water inlet pipe (2) is connected to a filter press biochemical system (14), and the water inlet pipe (2) is tangent to the filter tank (1); A filter element (5), the filter element (5) being rotatably mounted in the filter tank (1); A collecting mechanism 1 (6) and a collecting mechanism 2 (7), wherein the filter tank (1) is provided with a collecting mechanism 1 (6) and a collecting mechanism 2 (7) from top to bottom, respectively, and the collecting mechanism 1 (6) and the collecting mechanism 2 (7) are located outside the filter element (5) and are used to collect particles and suspended matter in water; Cleaning brushes (10), wherein a plurality of cleaning brushes (10) are installed in the first collecting mechanism (6), and the cleaning brushes (10) are in contact with the surface of the filter element (5); Cleaning mechanism (11), a plurality of cleaning mechanisms (11) are installed on the inner wall of the filter tank (1), and the cleaning mechanism (11) is located between the first collecting mechanism (6) and the second collecting mechanism (7); A drainage pipe (3), wherein the bottom end of the filter tank (1) is provided with a drainage pipe (3), and the bottom end of the filter element (5) is provided with a connecting pipe (53), wherein the connecting pipe (53) is movably connected to the drainage pipe (3).

3. The photovoltaic slicing wastewater treatment equipment according to claim 2 is characterized in that: The top of the filter element (5) is provided with an elastic telescopic member (52), the top of the elastic telescopic member (52) is rotatably connected to the top of the inner cavity of the filter tank (1), and the top of the filter element (5) is provided with a plurality of inclined driving plates (51), the inclination direction of the driving plates (51) is the same as the water inlet direction from the water inlet pipe (2).

4. The photovoltaic slicing wastewater treatment equipment according to claim 2 is characterized in that: The structures of the collecting mechanism 1 (6) and the collecting mechanism 2 (7) are the same. The collecting mechanism 1 (6) and the collecting mechanism 2 (7) include: A collection box (8), the collection box (8) being annular, the collection box (8) being located outside the filter element (5) and not in contact with the filter element (5), and an annular cavity (81) being provided inside the collection box (8); Inclined plate 1 (82) and inclined plate 2 (83), wherein the top of the collection box (8) is provided with an annular inclined plate 1 (82) on one side close to the inner side of the filter tank (1), and the inner wall of the filter tank (1) is provided with an annular inclined plate 2 (83), wherein the inclined plate 2 (83) and the inclined plate 1 (82) are inclined in opposite directions, and a passage is formed between the inclined plate 2 (83) and the inclined plate 1 (82) for particles or suspended matter to enter the collection box (8); A main scraper (9), wherein the main scraper (9) is installed in the cavity (81).

5. The photovoltaic slicing wastewater treatment equipment according to claim 4 is characterized in that: The top end of the collection box (8) and the bottom end of the cavity (81) are both in an inclined state, and the inclination direction is downwardly inclined towards the inner wall of the filter tank (1).

6. The photovoltaic slicing wastewater treatment equipment according to claim 4 is characterized in that: The main scraper (9) is in an inclined state, with its inclination direction facing the rotation direction of the filter element (5); a connecting rod (91) is connected to the main scraper (9); a connecting plate (54) is mounted on the filter element (5); the connecting rod (91) and the connecting plate (54) are connected in an upward and downward sliding manner; an auxiliary scraper (93) is arranged on the connecting rod (91); and the auxiliary scraper (93) is in contact with the top of the collection box (8).

7. The photovoltaic slicing wastewater treatment equipment according to claim 6 is characterized in that: The main scraper (9) is provided with a blocking ring (92), the blocking ring (92) being an incomplete ring, with a gap formed between the end of the blocking ring (92) and the main scraper (9). The positions corresponding to the collecting mechanism 1 (6) and the collecting mechanism 2 (7) on the filter tank (1) are respectively connected with a sewage discharge pipe 1 (12) and a sewage discharge pipe 2 (13). The two blocking rings (92) are respectively used to block the sewage discharge pipe 1 (12) and the sewage discharge pipe 2 (13), and the gap portion allows the sewage discharge pipe 1 (12) and the sewage discharge pipe 2 (13) to be opened.

8. The photovoltaic slicing wastewater treatment equipment according to claim 4, characterized in that: The cleaning brush (10) is fixed on the inner side of the collection box (8); the cleaning brush (10) is spiral-shaped, and its spiral direction is opposite to the rotation direction of the filter element (5).

9. The photovoltaic slicing wastewater treatment equipment according to claim 4, characterized in that: The cleaning mechanism (11) comprises: A material discharge box (111), the material discharge box (111) being fixed on the inner wall of the filter tank (1), the material discharge box (111) being directly opposite to the passage formed between the first inclined plate (82) and the second inclined plate (83); A guide tube (112), the material discharge box (111) being connected to the guide tube (112); A cleaning box (113), the other end of the guide tube (112) being connected to the cleaning box (113), the cleaning box (113) being provided with a cleaning scraper (115), the cleaning scraper (115), the cleaning box (113) having a cylindrical flow channel therein, a feed hole (114) being tangentially provided at a portion where the cleaning box (113) and the cleaning scraper (115) are connected, the feed holes (114) on the cleaning boxes (113) being distributed one by one from top to bottom in an arrangement order.

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