A photovoltaic slicing wastewater treatment process

Abstract

The present application relates to the technical field of photovoltaic slicing wastewater treatment, and specifically discloses a photovoltaic slicing wastewater treatment process, which comprises the following steps: step S1: collecting wastewater generated in a production workshop into a filter-biochemical system for centralized treatment; the wastewater enters a vortex formed in a filter tank through a wastewater tangent line, and under the action of centrifugal force, particles and suspended matters in the wastewater are thrown to the inner wall of the filter tank, so that the particles can be reduced to directly contact the filter core, the particles can be effectively prevented from washing the filter core under the impact of the wastewater, the surface of the filter core can be prevented from being damaged, the service life of the filter core can be prevented from being reduced, the particles can be prevented from damaging the ultrafiltration membrane in an ultrafiltration membrane system and entering a subsequent nanofiltration system, the concentration of silicon and fluorine on the membrane concentrated water side can be prevented from being enriched when the wastewater is subjected to nanofiltration, the membrane surface can be prevented from forming a deposit, the membrane can be prevented from being blocked, and the service life of the membrane can be prevented from being greatly reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of photovoltaic slicing wastewater treatment, and particularly relates to a photovoltaic slicing wastewater treatment process. BACKGROUND

[0002] The wastewater generated in the photovoltaic slicing process contains a large amount of silicon powder and organic matters in the cutting process, and direct discharge will cause damage to the ecological environment. The usual treatment method is to remove suspended solids through sedimentation / pressure filtration, and then to reduce the COD and other pollution factors through a biochemical process, so as to discharge. The traditional process can only achieve treatment and discharge, and a large amount of water resources cannot be recycled but enters the downstream sewage plant as wastewater, and a large amount of annual sewage discharge cost and tap water purchase cost is inevitable. Therefore, a technical solution capable of recycling, purifying and reusing wastewater is urgently needed by photovoltaic slicing enterprises.

[0003] The water treatment and purification recycling technology can adopt membrane treatment, and filters, ultrafiltration membranes, nanofiltration membranes and the like are used to filter the wastewater, so as to obtain pure water that can be recycled and utilized. However, due to the existence of a large amount of debris and particles in the photovoltaic slicing wastewater, some larger debris and particles are easily washed away from the surface of the filter element under the impact of water, so as to cause damage to the surface of the filter element. This not only reduces the service life of the filter element, but also reduces the filtering effect of the filter element. Some debris and particles will enter the nanofiltration system behind, and since calcium ions, silicon ions and fluorine ions exist in the wastewater, when the wastewater is subjected to nanofiltration, the concentration of silicon and fluorine is enriched on the membrane surface when the wastewater is subjected to nanofiltration, and a deposit is formed on the membrane surface, causing membrane blockage, and greatly reducing the service life of the membrane. SUMMARY

[0004] The purpose of the present application is to solve the technical problem that larger debris and particles are easily washed away from the surface of the filter element under the impact of water, so as to cause damage to the surface of the filter element, which not only reduces the service life of the filter element, but also reduces the filtering effect of the filter element, by providing a photovoltaic slicing wastewater treatment process.

[0005] The purpose of the present application can be achieved by the following technical solution:

[0006] A photovoltaic slicing wastewater treatment process comprises the following steps:

[0007] Step S1: cutting liquid wastewater, degumming liquid wastewater generated in the production workshop, backwash water and ROR concentrated water generated in the power workshop, and domestic sewage in the factory area are merged into a pressure filtration biochemical system for centralized treatment;

[0008] Step S2: the pressure filtration biochemical system adopts a Fenton advanced oxidation method to remove refractory organic pollutants in the photovoltaic slicing wastewater;

[0009] Step S3: The water produced by the pressure filtration biochemical system is introduced into the filter tank, and large particles and suspended solids in the produced water are filtered out through the filter core;

[0010] Step S4: The filtered large particles and suspended solids are collected by the collection mechanism one and the collection mechanism two, and are discharged into the sewage pipeline through the sewage pipe one and the sewage pipe two, and finally into the sewage well, and the concentrated water produced is discharged into the concentrated water outlet pipeline through the concentrated water discharge pipe, and finally into the sewage well;

[0011] Step S5: The filtered produced water is introduced into the ultrafiltration membrane system through the water pipeline, and 0.3-1 ppm sodium hypochlorite is added to the filtered produced water to further filter out small particles and small suspended solids in the produced water;

[0012] Step S6: The ultrafiltration produced water is introduced into the calcium removal nanofiltration system through the water pipeline, and the pH of the ultrafiltration produced water environment is controlled in the range of 4-7, and the calcium ion in the water is separated and removed by the calcium removal nanofiltration system;

[0013] Step S7: The calcium removal produced water is introduced into the silicon removal nanofiltration system, the pH of the calcium removal produced water environment is increased to 7-10, the silicon ion and the fluorine ion in the water are separated by the silicon removal nanofiltration system, and finally the produced water is discharged from the pure water outlet pipeline for recycling.

[0014] A photovoltaic slicing wastewater treatment device, the device applies a photovoltaic slicing wastewater treatment process as described above, the device comprises:

[0015] A filter tank, the filter tank is connected with a water inlet pipe, the water inlet pipe is connected with the pressure filtration biochemical system, and the water inlet pipe is tangent to the filter tank;

[0016] A filter core, the filter core is rotatably installed in the filter tank;

[0017] A collection mechanism one and a collection mechanism two, the filter tank is respectively provided with the collection mechanism one and the collection mechanism two from top to bottom, and the collection mechanism one and the collection mechanism two are located outside the filter core and are used for collecting particles and suspended solids in water;

[0018] A cleaning brush, a plurality of cleaning brushes are installed in the collection mechanism one, and the cleaning brushes are in contact with the surface of the filter core;

[0019] A cleaning mechanism, a plurality of cleaning mechanisms are installed on the inner wall of the filter tank, and the cleaning mechanisms are located between the collection mechanism one and the collection mechanism two;

[0020] A drain pipe, the drain pipe is installed at the bottom end of the filter tank, and the bottom end of the filter core is provided with a connecting pipe, and the connecting pipe is movably connected with the drain pipe.

[0021] As the preferred technical scheme of the above, the top end of the filter core is provided with an elastic telescopic part, the top end of the elastic telescopic part is rotationally connected with the top end of the inner cavity of the filter tank, the top of the filter core is provided with a plurality of inclined driving pieces, and the inclination direction of the driving pieces is the same as the water inlet direction of the water inlet pipe.

[0022] As the preferred technical scheme of the above, the collecting mechanism one and the collecting mechanism two are the same in structure, and the collecting mechanism one and the collecting mechanism two comprise:

[0023] The collecting box is annular, is located at the periphery of the filter core and does not contact the filter core, and an annular cavity is formed in the collecting box;

[0024] The collecting box is annular, is located at the periphery of the filter core and does not contact the filter core, and an annular cavity is formed in the collecting box;

[0025] The main scraper is installed in the cavity.

[0026] As the preferred technical scheme of the above, the top end of the collecting box and the bottom end of the cavity are both in an inclined state, and the inclination directions of the top end of the collecting box and the bottom end of the cavity are both downwardly inclined toward the inner wall of the filter tank.

[0027] As the preferred technical scheme of the above, the main scraper is in an inclined state, and the inclination direction of the main scraper is toward the rotation direction of the filter core, a connecting rod is connected to the main scraper, a connecting plate is installed on the filter core, the connecting rod and the connecting plate are connected in an up-and-down sliding mode, a secondary scraper is arranged on the connecting rod, and the secondary scraper is attached to the top of the collecting box.

[0028] As the preferred technical scheme of the above, the main scraper is in an inclined state, and the inclination direction of the main scraper is toward the rotation direction of the filter core, a connecting rod is connected to the main scraper, a connecting plate is installed on the filter core, the connecting rod and the connecting plate are connected in an up-and-down sliding mode, a secondary scraper is arranged on the connecting rod, and the secondary scraper is attached to the top of the collecting box.

[0029] As the preferred technical scheme of the above, the cleaning brush is fixed to the inner side of the collecting box, and the cleaning brush is in a spiral shape, and the spiral direction of the cleaning brush is opposite to the rotation direction of the filter core.

[0030] As the preferred technical scheme of the above, the cleaning mechanism comprises:

[0031] The blanking box is fixed to the inner wall of the filter tank, and the blanking box faces the passage formed between the inclined plate one and the inclined plate two.

[0032] A guide pipe is connected to the blanking box;

[0033] A cleaning box is connected to the other end of the guide pipe, and a cleaning scraper is arranged on the cleaning box.

[0034] The beneficial effects of the present application are:

[0035] 1. In the present application, the vortex formed by the tangential entry of wastewater into the filter tank is caused by centrifugal force, which causes particles and suspended solids in the wastewater to be thrown against the inner wall of the filter tank. This can reduce the direct contact of particles with the filter core, effectively avoid the particles from washing the filter core under the impact of wastewater, avoid the damage of the filter core surface, thereby avoid reducing the service life of the filter core, avoid the particles from damaging the ultrafiltration membrane in the ultrafiltration membrane system and entering the subsequent nanofiltration system, avoid the enrichment of silicon and fluorine concentration on the membrane concentrated water side when the wastewater is nanofiltered, avoid the formation of sediment on the membrane surface, avoid the membrane clogging phenomenon, and avoid the substantial reduction of the service life of the membrane.

[0036] 2. In the present application, the collection mechanism one and the collection mechanism two are used to collect and discharge the particles and suspended solids, which reduces the probability of contact between the particles and the filter core, thereby effectively avoiding the damage of the filter core surface and ensuring the continuous filtration of the filter core. This can prolong the cleaning cycle of the filter core and reduce the maintenance cost.

[0037] 3. In the present application, the filter core filtration and the three-stage nanofiltration membrane technology are used to treat the slice wastewater. By adding filter core filtration, ultrafiltration and two-stage nanofiltration after the pressure filtration biochemical system, the reuse amount of slice wastewater is improved, the amount of tap water purchased by enterprises is reduced, and the waste is turned into treasure. The present application needs to perform filter core filtration, ultrafiltration, calcium removal nanofiltration and silicon removal nanofiltration respectively. The reason is that the slice wastewater has complex water quality (containing particles, calcium salt, silicon and fluorine impurities), which needs to be treated step by step. Moreover, the cooperation of filter core filtration and three kinds of membranes can improve the removal efficiency of the membranes. The filter core intercepts a large amount of large particles and suspended solids in the wastewater, protects the ultrafiltration membrane surface from being scratched and clogged by large particles, the ultrafiltration intercepts small particles and suspended solids for the two-stage nanofiltration, protects the two-stage nanofiltration membrane surface from being scratched and clogged by small particles, the calcium removal nanofiltration can intercept calcium ions, avoid the enrichment of silicon and fluorine concentration on the membrane concentrated water side when the last step of silicon removal and fluorine removal nanofiltration is performed, avoid the formation of sediment on the membrane surface, cause the membrane clogging phenomenon, and substantially reduce the service life of the membrane. The silicon removal nanofiltration intercepts silicon and fluorine ions and other anions, realizes the final pure water reuse; and the three membranes of the present application can enhance the purification ability of the system while prolonging the service life of the membrane. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 Fig. 1 is a process flow diagram of the present application;

[0039] Figure 2 Fig. 2 is a schematic diagram of the internal structure of the filter tank;

[0040] Figure 3 Fig. 3 is a schematic diagram of the pipe structure connected to the filter tank;

[0041] Figure 4 Fig. 4 is a schematic diagram of the cross-sectional structure of the filter tank;

[0042] Figure 5 Fig. 5 is a schematic diagram of the structure of the collection mechanism; Figure 4

[0043] Fig. 6 is a schematic diagram of the enlarged structure at point A in Fig. 5; Figure 6

[0044] Fig. 7 is a schematic diagram of the structure of the collection mechanism; Figure 7

[0045] Fig. 8 is a schematic diagram of the structure of the collection mechanism; Figure 8

[0046] Fig. 9 is a schematic diagram of the structure of the scraper; Figure 9

[0047] Fig. 10 is a schematic diagram of the structure of the cleaning mechanism; Figure 10

[0048] Fig. 11 is a schematic diagram of the distribution structure of the feed holes on each cleaning box.

[0049] 1, filter tank; 2, water inlet pipe; 3, water outlet pipe; 4, concentrated water outlet pipe; 5, filter core; 51, driving piece; 52, elastic expansion piece; 53, connecting pipe; 54, connecting plate; 6, collection mechanism I; 7, collection mechanism II; 8, collection box; 81, cavity; 82, inclined plate I; 83, inclined plate II; 9, main scraper; 91, connecting rod; 92, plugging ring; 93, auxiliary scraper; 10, cleaning brush; 11, cleaning mechanism; 111, discharge box; 112, guide pipe; 113, cleaning box; 114, feed hole; 115, cleaning scraper; 12, sewage pipe I; 13, sewage pipe II; 14, pressure filtration biochemical system; 15, calcium removal nanofiltration system; 16, silicon removal nanofiltration system; 17, water passage; 18, pure water outlet pipe; 19, concentrated water outlet pipe; 20, sewage pipe; 21, ultrafiltration membrane system. DETAILED DESCRIPTION

[0050] ​With reference to the accompanying drawings: the technical solutions in the embodiments of the present application will be apparently and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0051] As shown in the figure, a photovoltaic slicing wastewater treatment process comprises the following steps: Figures 1-10

[0052] Step S1: cutting fluid wastewater, degreasing fluid wastewater generated in the production workshop, and backwash water and ROR concentrated water generated in the power workshop and plant area domestic sewage are merged into the filter press biochemical system 14 for centralized treatment;

[0053] Step S2: the filter press biochemical system 14 adopts Fenton advanced oxidation process to remove refractory organic pollutants in the photovoltaic slicing wastewater;

[0054] Step S3: the water produced by the filter press biochemical system 14 is introduced into the filter tank 1, and large particles and suspended solids in the produced water are filtered out through the filter core 5;

[0055] Step S4: the filtered large particles and suspended solids are concentrated by the collection mechanism one 6 and the collection mechanism two 7, and are discharged into the sewage pipe 20 through the sewage pipe one 12 and the sewage pipe two 13, and finally into the sewage well, the concentrated water is discharged into the concentrated water outlet pipe 19 through the concentrated water discharge pipe 4, and finally into the sewage well;

[0056] Step S5: the filtered produced water is introduced into the ultrafiltration membrane system 21 through the water pipe 17, 0.3-1 ppm sodium hypochlorite is added to the filtered produced water, and fine particles and fine suspended solids in the produced water are further filtered out;

[0057] Step S6: the ultrafiltration produced water is introduced into the calcium removal nanofiltration system 15 through the water pipe 17, the pH of the ultrafiltration produced water environment is controlled in the range of 4-7, and the calcium ion in the water is separated and removed by the calcium removal nanofiltration system 15;

[0058] Step S7: the calcium removal produced water is introduced into the silicon removal nanofiltration system 16, the pH of the calcium removal produced water environment is increased to 7-10, the silicon ion and the fluorine ion in the water are separated and removed by the silicon removal nanofiltration system 16, and finally the produced water is discharged from the pure water outlet pipe 18 for recycling.

[0059] First of all, it needs to be pointed out that the essence of Fenton advanced oxidation process is the chain reaction catalysis between divalent iron ion (Fe2+) and hydrogen peroxide to generate hydroxyl radicals, and the strong oxidation ability of hydroxyl radicals is used to oxidize organic compounds such as carboxylic acid, alcohol and ester to inorganic state, so as to remove refractory organic pollutants; ​

[0060] The ultrafiltration membrane separation in the ultrafiltration membrane system 21 is between nanofiltration and microfiltration, the pore size range is 0.001-0.05 μm, the ultrafiltration membrane is porous and has an asymmetric structure, the thickness of the top layer is 1.0-3.0 μm, the pore size is larger than that of the nanofiltration and reverse osmosis membrane, the working pressure is low, and is in the range of 2-5 bar for removing fine particles and suspended solids in the effluent of the biochemical system; the ultrafiltration membrane in the ultrafiltration membrane system 21 intercepts fine particles and suspended solids (including colloids), and the problem of biological slime blocking is effectively inhibited by adding not less than 0.3 ppm of sodium hypochlorite on the water inlet side of the ultrafiltration membrane system 21; in addition, the frequency of the rapid flushing of the ultrafiltration membrane system 21 is limited, and it is required to perform rapid flushing for 1-3 minutes every 30-120 minutes of operation, and the flushing water contains 50-100 ppm of sodium hypochlorite;

[0061] The calcium-removing nanofiltration system 15 separates calcium, the most risky compound in the composite pollutants, from silicon and fluorine. The conventional process of directly purifying by reverse osmosis membrane is prone to failure due to the problem of blocking at this stage. The nanofiltration has lower working pressure and energy consumption than reverse osmosis, has higher water permeability, can save power consumption for enterprises and improve water production rate. The removal of pollutants and ions from water by nanofiltration is the result of the combined action of multiple phenomena, such as steric hindrance, Donnan effect and electrostatic effect. The calcium-removing nanofiltration membrane used in the present application can adsorb divalent cations on the surface and change the surface charge density of the membrane. The mechanism is that the surface membrane charge is protonated by the functional group, and the amide group on the surface of the membrane helps to selectively screen the calcium ions. Under acidic conditions (low pH value, pH < 5.5), the amide group is mostly in the form of protonation ([R-NH2]+[H3O] ⇌ [R-NH+3+]) which is beneficial to the separation of calcium ions. Anion silicate, metasilicate ion and fluoride ion tend to combine with hydrogen ions to form neutral molecules in an environment with pH less than 7. In the screening mechanism of the nanofiltration membrane, the neutral ions can be allowed to pass through by using the selective property of charge repulsion, thereby having the ability to separate calcium ions from silicate ions and fluoride ions. That is, by controlling the pH of the water environment in the range of 4-7 after entering the calcium-removing nanofiltration system 15, the surface of the nanofiltration membrane in the calcium-removing nanofiltration system 15 is mainly formed with positive charges, the removal of cations such as calcium ions is improved, the interception of silicon is reduced, and thus calcium and silicon are separated. Calcium ions enter the concentrated water for discharge, and silicon mainly enters the silicon-removing nanofiltration system 16, reducing the occurrence of calcium silicate blocking;

[0062] In the silicon removal nanofiltration system 16, by increasing the pH in the water environment to 7-10, the nanofiltration membrane surface in the silicon removal nanofiltration system 16 is mainly negatively charged, fully intercepting anion such as silicate ion and fluoride ion, so that the removal rate of fluoride ion is always above 99.33%, achieving efficient purification of wastewater; The concentrated water of the silicon removal nanofiltration system 16 only contains ions and does not contain particulate matter, which is used to flush the filter tank 1 and the ultrafiltration membrane system 21, thereby reducing the amount of wastewater discharge;

[0063] In addition, the ultrafiltration membrane in the ultrafiltration membrane system 21 used here is made of one of poly sulfone, poly ether sulfone, sulfonated poly sulfone, polyvinylidene fluoride, polytetrafluoroethylene, polyaniline, polyvinyl acetate) or composite, 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, and has chemical groups such as amino, carboxyl and sulfonic acid groups on the surface, which can exhibit positive charge in acidic environment and negative charge in alkaline environment;

[0064] Finally, the fluoride content of the water outlet from the pure water outlet pipeline 18 is stable <1ppm, the fluoride removal rate is above 99.33%, and the silicon content of the water outlet is stable <2ppm.

[0065] As shown in Figures 2-4 A photovoltaic slicing wastewater treatment device, the device applies a photovoltaic slicing wastewater treatment process as described above, the device comprises:

[0066] The filter tank 1 is connected with the water inlet pipe 2, the water inlet pipe 2 is connected with the filter-pressing biochemical system 14, and the water inlet pipe 2 is tangent to the filter tank 1.

[0067] The filter core 5 is rotatably installed in the filter tank 1.

[0068] The collection mechanism one 6 and the collection mechanism two 7 are installed in the filter tank 1 from top to bottom, respectively, and the collection mechanism one 6 and the collection mechanism two 7 are located outside the filter core 5, for collecting particles and suspended solids in water.

[0069] The cleaning brush 10 is installed in the collection mechanism one 6 and is in contact with the surface of the filter core 5.

[0070] The cleaning mechanism 11 is installed on the inner wall of the filter tank 1 and is located between the collection mechanism one 6 and the collection mechanism two 7.

[0071] The drain pipe 3 is installed at the bottom end of the filter tank 1, and the bottom end of the filter core 5 is provided with a connecting pipe 53 which is movably connected with the drain pipe 3.

[0072] Further, the filter core 5 is provided with an elastic telescopic part 52 at the top end, the top end of the elastic telescopic part 52 is rotatably connected with the top end of the inner cavity of the filter tank 1, the top of the filter core 5 is provided with a plurality of inclined driving pieces 51, the inclination direction of the driving pieces 51 is the same as the water inlet direction of the water inlet pipe 2.

[0073] In one case of the embodiment, the elastic telescopic part 52 can be an elastic telescopic sleeve rod, or other elastic telescopic parts.

[0074] In actual application, the wastewater enters the filter tank 1 in a tangent state through the water inlet pipe 2, due to the pressure of the wastewater, the wastewater enters the filter tank 1 in a spiral state, due to the centrifugal force, the particles and suspended matters in the wastewater are thrown to the inner wall of the filter tank 1, which can reduce the direct contact of the particles with the filter core 5, effectively avoid the particles from washing the filter core 5 under the impact of the wastewater, causing the surface of the filter core 5 to be damaged, thereby reducing the service life of the filter core 5, avoiding the particles from damaging the ultrafiltration membrane in the ultrafiltration membrane system 21 and entering the subsequent nanofiltration system, avoiding the enrichment of the concentration of silicon and fluorine on the membrane concentrated water side when the wastewater is nanofiltered, avoiding the formation of sediment on the membrane surface, avoiding the phenomenon of membrane blockage, and avoiding the substantial reduction of the service life of the membrane; at the same time, the particles and suspended matters are thrown to the inner wall of the filter tank 1, due to the weight of the particles and suspended matters, the particles and suspended matters will slowly move downward and finally enter the collection mechanism one 6 and the collection mechanism two 7 to be collected, effectively avoiding a large amount of particles and suspended matters in the filter tank 1, avoiding the reduction of the water flow through the filter core 5; in addition, most of the particles directly enter the collection mechanism one 6 and the collection mechanism two 7, which reduces the probability of the particles contacting the filter core 5, thereby effectively avoiding the surface of the filter core 5 from being damaged, ensuring the continuous filtration of the filter core 5, which prolongs the cleaning cycle of the filter core 5 and reduces the maintenance cost.

[0075] Due to the existence of the driving pieces 51, the wastewater will impact the driving pieces 51 after entering the filter tank 1, thereby driving the filter core 5 to rotate, which can throw the particles and suspended matters attached to the surface of the filter core 5, effectively avoiding the particles and suspended matters from blocking the filter core 5 and reducing the filtration effect of the filter core 5; in addition, due to the inclined state of the driving pieces 51, the driving pieces 51 will move downward under the impact of the wastewater, thereby driving the filter core 5 to move downward, cooperating with the elastic telescopic part 52 to control the water pressure of the wastewater entering the filter tank 1 intermittently, so that the filter core 5 can move up and down while rotating, which can further throw the particles and suspended matters attached to the surface of the filter core 5, effectively avoiding the particles and suspended matters from blocking the filter core 5 and reducing the filtration effect of the filter core 5, and effectively avoiding the particles from damaging the filter core 5.

[0076] In addition, the filter element 5 reciprocates up and down while rotating, and the cleaning brush 10 can clean the particles and suspended matters attached to the surface of the filter element 5, effectively avoiding the particles and suspended matters from being attached to the filter element 5 to reduce the filtering effect of the filter element 5, and also avoiding the particles from damaging the filter element 5; the cleaning brush 10 directly sweeps the particles and suspended matters, effectively avoiding the particles and suspended matters from being attached to the filter element 5 again.

[0077] As shown in Figures 2-8 The collecting mechanism one 6 and the collecting mechanism two 7 have the same structure, and the collecting mechanism one 6 and the collecting mechanism two 7 comprise:

[0078] The collecting box 8 is annular, and the collecting box 8 is located at the periphery of the filter element 5 and does not contact the filter element 5, and the annular cavity 81 is formed in the collecting box 8;

[0079] The inclined plate one 82 and the inclined plate two 83 are annular, the inclined plate one 82 is arranged at the top end of the collecting box 8 close to one side of the inner side of the filter tank 1, the inner wall of the filter tank 1 is provided with the annular inclined plate two 83, the inclined directions of the inclined plate two 83 and the inclined plate one 82 are opposite, and the inclined plate two 83 and the inclined plate one 82 form a channel for the particles or suspended matters to enter the collecting box 8;

[0080] The main scraper 9 is installed in the cavity 81.

[0081] In actual application, the particles and suspended matters enter the collecting box 8 through the channel between the inclined plate one 82 and the inclined plate two 83, and are collected by the collecting box 8, effectively avoiding the particles and suspended matters from being attached to the surface of the filter element 5 again, and effectively avoiding the particles from damaging the filter element 5.

[0082] Further, the top end of the collecting box 8 and the bottom end of the cavity 81 are in an inclined state, and the inclined directions thereof are downwardly inclined toward the inner wall of the filter tank 1.

[0083] In actual application, the particles and suspended matters can slide into the collecting box 8 through the inclination of the top end of the collecting box 8, and the particles and suspended matters in the collecting box 8 can be close to the inner wall of the filter tank 1 through the inclination of the bottom end of the cavity 81, so as to be easily discharged from the drain pipe one 12 and the drain pipe two 13.

[0084] Further, the main scraper 9 is in an inclined state, and the inclined direction thereof is toward the rotating direction of the filter element 5, the connecting rod 91 is connected to the main scraper 9, the connecting plate 54 is installed on the filter element 5, the connecting rod 91 and the connecting plate 54 are in sliding connection, the auxiliary scraper 93 is arranged on the connecting rod 91, and the auxiliary scraper 93 is in close contact with the top of the collecting box 8.

[0085] In actual application, when the filter core 5 rotates, the connecting plate 54 drives the connecting rod 91 to rotate, so that the connecting rod 91 drives the main scraper 9 to rotate around the filter core 5, the main scraper 9 scrapes the particles and suspended matters collected in the cavity 81 to move, so that the particles and suspended matters slowly approach the drain pipe one 12 and the drain pipe two 13, and the particles and suspended matters are conveniently discharged; in addition, the auxiliary scraper 93 rotates at the top end of the collecting box 8, and the particles and suspended matters at the top end of the collecting box 8 can be hung into the collecting box 8, so that the collecting effect is improved; in addition, the connecting rod 91 and the connecting plate 54 slide up and down, so that the position of the main scraper 9 does not change when the filter core 5 moves up and down.

[0086] Further, the main scraper 9 is provided with a blocking ring 92, 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 filter tank 1 is respectively penetrated with the drain pipe one 12 and the drain pipe two 13 at positions corresponding to the collecting mechanism one 6 and the collecting mechanism two 7, and the two blocking rings 92 are respectively used for blocking the drain pipe one 12 and the drain pipe two 13, and the gap part makes the drain pipe one 12 and the drain pipe two 13 open.

[0087] In actual application, the main scraper 9 scrapes the particles and suspended matters in the cavity 81, and drives the particles and suspended matters to rotate around the filter core 5, when rotating, the gap between the blocking ring 92 and the main scraper 9 coincides with the drain pipe one 12 or the drain pipe two 13, and the particles and suspended matters enter the drain pipe one 12 or the drain pipe two 13 and are discharged;

[0088] The drain pipe one 12 and the drain pipe two 13 are tangent to the filter tank 1, so that the particles and suspended matters enter the drain pipe one 12 and the drain pipe two 13 and are discharged, the processing efficiency of the particles and suspended matters is improved, so that the particles contact the filter core 5 and damage the filter core 5 are effectively avoided.

[0089] As shown in Figure 2 and As shown in Figure 6 , the cleaning brush 10 is fixed to the inner side of the collecting box 8, and the cleaning brush 10 is helical, and the helical direction is opposite to the rotating direction of the filter core 5.

[0090] In actual application, when the filter core 5 rotates, the particles and suspended matters attached to the surface of the filter core 5 are scraped down by the cleaning brush 10, and move along the helical track of the cleaning brush 10, and finally move to the top end of the collecting box 8, and are scraped into the collecting box 8 by the auxiliary scraper 93, so that the collecting efficiency of the particles and suspended matters is improved, and the particles contact the filter core 5 and damage the filter core 5 are effectively avoided.

[0091] As shown in Figures 7-10 , the cleaning mechanism 11 comprises:

[0092] The blanking box 111 is fixed on the inner wall of the filter tank 1 and faces the channel formed between the inclined plate one 82 and the inclined plate two 83.

[0093] The guide pipe 112 is connected to the blanking box 111.

[0094] The cleaning box 113 is connected to the other end of the guide pipe 112, and the cleaning scraper 115 is arranged on the cleaning box 113. The cleaning box 113 is a cylindrical flow channel, and the inlet hole 114 is tangentially arranged on the part of the cleaning box 113 connected to the cleaning scraper 115. The inlet holes 114 on the cleaning boxes 113 are arranged from top to bottom.

[0095] It should be noted that after the wastewater enters the filter tank 1, most of the particles and suspended solids enter the collection box 8 in the collection mechanism one 6, and a small amount of small particles and small suspended solids slowly move to the lower part of the collection mechanism one 6, which needs to be collected by the collection mechanism two 7.

[0096] In actual application, part of the small particles and small suspended solids slowly move to the top of the collection box 8 in the collection mechanism two 7 and slowly enter the cavity 81, and the other part of the small particles and small suspended solids may be attached to the surface of the filter core 5. At this time, the small particles and small suspended solids attached to the surface of the filter core 5 can be scraped off by the cleaning scraper 115 on the cleaning box 113 and enter the cleaning box 113 through the inlet hole 114. Finally, the small particles and small suspended solids are guided into the collection box 8 through the guide pipe 112 and the blanking box 111. In this way, the small particles and small suspended solids can be collected and treated, and most of the particles and suspended solids in the wastewater can be collected and discharged by the collection mechanism one 6, effectively avoiding the contact between the particles and the filter core 5 and damaging the filter core 5. At the same time, the filtering efficiency of the filter core 5 is guaranteed, and the water flow is ensured.

[0097] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A process for treating photovoltaic wafer slicing wastewater, characterized in that, This includes a device for treating photovoltaic wafer slicing wastewater, the device comprising: A filter tank (1) is connected to an inlet pipe (2), which is connected to a pressure filter biochemical system (14) and is tangent to the filter tank (1). Filter element (5), which is rotatably installed inside filter tank (1); Collection mechanism one (6) and collection mechanism two (7) are installed in the filter tank (1) from top to bottom respectively. Collection mechanism one (6) and collection mechanism two (7) are located outside the filter element (5) and are used to collect particles and suspended solids in the water. Cleaning brush (10): A plurality of cleaning brushes (10) are installed in the collection mechanism (6), and the cleaning brushes (10) are in contact with the surface of the filter element (5); Cleaning mechanism (11): Several cleaning mechanisms (11) are installed on the inner wall of the filter tank (1), and the cleaning mechanism (11) is located between the first collection mechanism (6) and the second collection mechanism (7); Drain pipe (3), the bottom end of the filter tank (1) is equipped with a drain pipe (3), the bottom end of the filter element (5) is provided with a connecting pipe (53), and the connecting pipe (53) is movably connected to the drain pipe (3); The filter element (5) is provided with an elastic telescopic member (52) at the top end. The top end of the elastic telescopic member (52) is rotatably connected to the top end of the inner cavity of the filter tank (1). The filter element (5) is provided with a number of inclined drive plates (51) at the top. The inclination direction of the drive plates (51) is the same as the water inlet direction from the water inlet pipe (2). The first collection mechanism (6) and the second collection mechanism (7) have the same structure, and the first collection mechanism (6) and the second collection mechanism (7) include: Collection box (8), the collection box (8) is annular, the collection box (8) is located on the periphery of the filter element (5) and does not contact the filter element (5), and an annular cavity (81) is opened in the collection box (8). Inclined plate one (82) and inclined plate two (83), an annular inclined plate one (82) is provided on the top of the collection box (8) near the inner side of the filter tank (1), and an annular inclined plate two (83) is provided on the inner wall of the filter tank (1). The inclined plate two (83) and inclined plate one (82) are inclined in opposite directions, and a channel for particles or suspended matter to enter the collection box (8) is formed between inclined plate two (83) and inclined plate one (82). Main scraper (9), the cavity (81) is equipped with the main scraper (9).

2. The photovoltaic wafer slicing wastewater treatment process according to claim 1, characterized in that, The top of the collection box (8) and the bottom of the cavity (81) are both inclined, and their inclination direction is downward towards the inner wall of the filter tank (1).

3. The photovoltaic wafer slicing wastewater treatment process according to claim 1, characterized in that, The main scraper (9) is tilted, with its tilt direction facing 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 slidably connected up and down. A secondary scraper (93) is provided on the connecting rod (91), and the secondary scraper (93) is in contact with the top of the collection box (8).

4. The photovoltaic wafer slicing wastewater treatment process according to claim 3, characterized in that, The main scraper (9) is provided with a sealing ring (92). The sealing ring (92) is an incomplete ring. A gap is formed between the end of the sealing ring (92) and the main scraper (9). The filter tank (1) is connected to the sewage pipe one (12) and the sewage pipe two (13) respectively at the positions corresponding to the collection mechanism one (6) and the collection mechanism two (7). The two sealing rings (92) are used to block the sewage pipe one (12) and the sewage pipe two (13) respectively. The gap allows the sewage pipe one (12) and the sewage pipe two (13) to be opened.

5. The photovoltaic wafer slicing wastewater treatment process according to claim 1, characterized in that, The cleaning brush (10) is fixed inside 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).

6. The photovoltaic wafer slicing wastewater treatment process according to claim 1, characterized in that, The cleaning mechanism (11) includes: Feed box (111), the feed box (111) is fixed on the inner wall of the filter tank (1), the feed box (111) is directly opposite the channel formed between inclined plate one (82) and inclined plate two (83); Guide tube (112), the feeding box (111) is connected to the guide tube (112); The cleaning box (113) is connected to the other end of the guide tube (112). The cleaning box (113) is provided with a cleaning scraper (115). The cleaning scraper (115) and the cleaning box (113) are cylindrical flow channels. The part where the cleaning box (113) and the cleaning scraper (115) are connected is provided with a feed hole (114) at a tangential angle. The feed holes (114) on several cleaning boxes (113) are distributed one by one from top to bottom in an arrangement order.

7. The photovoltaic wafer slicing wastewater treatment process according to claim 1, characterized in that, The process includes the following steps: Step S1: The cutting fluid wastewater and degumming fluid wastewater generated in the production workshop, the backwash water and ROR concentrate generated in the power workshop, and the domestic sewage in the plant area are collected into the filter press biochemical system (14) for centralized treatment; Step S2: The filter press biochemical system (14) uses Fenton advanced oxidation to remove recalcitrant organic pollutants from photovoltaic chip wastewater; Step S3: Pass the permeate from the filter press biochemical system (14) into the filter tank (1) and filter out large particles and suspended solids in the permeate through the filter element (5); Step S4: Large particles and suspended solids filtered out are collected by collection mechanism one (6) and collection mechanism two (7), and discharged into the sewage pipe (20) through sewage pipe one (12) and sewage pipe two (13), and finally enter the sewage well. The concentrated water generated is discharged into the concentrated water outlet pipe (19) through the concentrated water outlet 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 0.3-1ppm sodium hypochlorite is added to the filtered water to further filter out fine particles and fine suspended solids in the water; Step S6: The ultrafiltration permeate enters the calcium removal nanofiltration system (15) through the water pipe (17), and the pH of the ultrafiltration permeate environment is controlled within the range of 4-7. The calcium removal nanofiltration system (15) separates and removes calcium ions from the water. Step S7: The calcium-removed water enters the silicon-removing nanofiltration system (16), raising the pH of the calcium-removed water environment to 7-10. The silicon-removing nanofiltration system (16) separates silicon ions and fluoride ions from the water. Finally, the water is discharged from the pure water outlet pipe (18) for recycling.

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