Photocatalytic treatment method and device for pesticide wastewater

Abstract

The present invention relates to the technical field of pesticide wastewater treatment, and discloses a method and device for photocatalytic treatment of pesticide wastewater, including a treatment tank body, a wastewater stirring and diverting photocatalytic mechanism fixed on the upper part of the treatment tank body, a driving mechanism provided on the treatment tank body, a rotating shaft at the front end of the driving mechanism extending through a mixing drum and connected to an oxygenation mechanism, and a spiral blade located in the mixing drum is also fixed on the surface of the rotating shaft; a filtering and stirring mechanism located below the two ends of a diverting seat is provided on both sides of the treatment tank body, and a wastewater introduction system is also provided at the front end of the rotating shaft. The wastewater introduction system of the present invention sprays wastewater into the mixing drum, and the wastewater enters the diverting groove after being filtered by the filter net at the bottom of the side of the mixing drum, and the wastewater enters the photocatalytic component to purify the wastewater. The wastewater in the treatment tank body circulates into the shell through the slots on the upper part of the inner wall of the shell, which is conducive to improving the circulation filtering effect of the first filter plate and the second filter plate on the wastewater.

Description

Technical Field

[0001] The invention relates to the technical field of pesticide wastewater treatment, and in particular to a method and device for photocatalytic treatment of pesticide wastewater. Background Art

[0002] A large amount of organic wastewater is generated during the pesticide production process. The effective treatment of difficult-to-degrade organic wastewater is conducive to reducing pesticide pollution. In the process of treating pesticide wastewater, the mixed organic waste molecules in the pesticide wastewater are difficult to treat cleanly, so that the toxic effect of the pesticide wastewater after treatment is not well reduced. The stirring, aeration, and filtration of the pesticide wastewater are all treated with separate equipment, which increases the equipment investment cost. For this reason, we have introduced a photocatalytic treatment method and device for pesticide wastewater. Summary of the invention

[0003] The purpose of the present invention is to provide a method and device for photocatalytic treatment of pesticide wastewater to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A photocatalytic treatment device for pesticide wastewater, comprising a treatment tank body, wherein a wastewater stirring and diverting photocatalytic mechanism is fixed on the upper part of the treatment tank body, and the wastewater stirring and diverting photocatalytic mechanism comprises a diverting seat, a raised seat arranged in the middle of the upper end of the diverting seat, diverting grooves evenly distributed on both sides of the upper end of the diverting seat, a photocatalytic component arranged on the side wall of the diverting groove, and a stirring drum extending through the raised seat;

[0006] The treatment tank body is provided with a driving mechanism, a rotating shaft at the front end of the driving mechanism extends through the mixing drum and is connected to an oxygenation mechanism, and a spiral blade located in the mixing drum is fixed on the surface of the rotating shaft;

[0007] The two sides of the treatment tank body are provided with a filtering and stirring mechanism located below the two ends of the diverter seat, and the filtering and stirring mechanism includes a shell, a filter plate assembly arranged up and down inside the shell, and a bottom stirring member driven by a driving mechanism;

[0008] The front end of the rotating shaft is also provided with a wastewater introduction system, which introduces wastewater into the channel inside the rotating shaft, and allows the wastewater to be sprayed into the mixing drum through the spray hole on the surface of the rotating shaft. Subsequently, the wastewater is filtered by the filter screen at the bottom of the side of the mixing drum and enters the diversion trough. At this time, as the rotating shaft rotates, the oxygenation mechanism performs an oxygenation operation on the wastewater filtered by the filter screen.

[0009] The wastewater in the diversion trough falls into the shell, and falls to the bottom of the shell after being filtered by the filter plate assembly. At this time, under the rotation of the bottom agitator, the wastewater at the bottom of the shell is pumped out to the treatment tank body, so that the wastewater in the treatment tank body circulates into the shell through the grooves on the upper part of the inner wall of the shell, and the height of the grooves is higher than the filter plate assembly.

[0010] Preferably, the photocatalytic assembly comprises a transparent shell embedded in the side wall of the diverter trough, a photocatalyst filled in the transparent shell, and an ultraviolet lamp pre-buried in the photocatalyst;

[0011] The transparent shell has water-permeable holes evenly distributed on its side, and the photocatalyst is activated carbon / nano-doped cobalt titanium dioxide / chitosan composite microspheres.

[0012] Preferably, the driving mechanism comprises a motor for driving the rotating shaft, and the motor is fixed on a mounting frame at the rear end of the treatment tank body;

[0013] The output end of the motor is connected to a first pulley, and the rear end of the rotating shaft passes through the mixing drum and the treatment tank body and is connected to a second pulley;

[0014] The bottom stirring member includes a bottom rotating rod connected to the bottom of the shell and a stirring plate fixed on the surface of the bottom rotating rod, and a third pulley connected to the rear end of a group of bottom rotating rods that penetrates the shell and the treatment tank body;

[0015] A first belt is connected between the first pulley and the second pulley, and the first belt passes through the U-shaped groove on the mounting frame. A second belt is connected between the second pulley and the third pulley.

[0016] Preferably, the front end of the bottom rotating rod passes through the treatment tank body and is connected to a first gear, and the lower part of the rear end of the treatment tank body is movably connected to a second gear and a third gear that mesh with each other through a pin shaft, and the two sets of first gears are respectively meshed with the outer sides of the second gear and the third gear;

[0017] The filter plate assembly comprises a first filter plate and a second filter plate which are distributed up and down in a shell. A support plate for supporting the first filter plate and the second filter plate respectively is provided on the inner wall of the shell. The slot height is higher than that of the first filter plate.

[0018] Preferably, the wastewater introduction system includes a water diversion head sleeved on the front end of the rotating shaft, the water diversion head is fixed at the rear end of the mixing drum, an annular groove connected to the channel is provided in the middle of the water diversion head, sealing rings located on both sides of the annular groove are embedded in the inner wall of the water diversion head, the sealing rings are sleeved on the rotating shaft, and a wastewater introduction pipe connected to the annular groove is provided on the water diversion head.

[0019] Preferably, the portion of the front end bottom of the mixing drum extending out of the treatment tank body is provided with an impurity discharge groove;

[0020] The oxygen enrichment mechanism comprises an annular gas collecting plate fixed at the front end of the mixing drum, a gas collecting blade fixed behind the annular gas collecting plate and extending through the front end of the rotating shaft into the mixing drum, a gas collecting box body connected to the upper part of the rear end of the annular gas collecting plate, an air guide pipe connected to the rear end of the air collecting box body, and a branch pipe connected to the inner side of the air guide pipe;

[0021] The raised seat is provided with an aeration chamber located on both sides of the mixing drum, the aeration chamber is connected with the diversion groove, a connecting groove is provided between the aeration chamber and the diversion groove, and a wastewater outflow outlet is provided at the outer end of the diversion groove;

[0022] The branch pipe is communicated with the air passage inside the raised seat, and the bottom of the air passage is communicated with the nozzle at the top of the aeration chamber.

[0023] Preferably, an end cover is inserted into the front end of the annular gas collecting disk, a protective net is provided in the middle of the end cover, and buckle seats are provided at the upper and lower ends of the end cover to be buckled on the annular gas collecting disk.

[0024] The present invention also provides a method for treating pesticide wastewater using a photocatalytic treatment device, which specifically comprises the following steps:

[0025] S1. The wastewater introduction system introduces wastewater into the channel inside the rotating shaft, and sprays the wastewater into the mixing drum through the spray holes on the surface of the rotating shaft. Then, the wastewater is filtered by the filter screen at the bottom of the side of the mixing drum and enters the diversion tank;

[0026] S2. At this time, as the shaft rotates, the oxygenation mechanism performs oxygenation operation on the wastewater filtered by the filter screen;

[0027] S3. The wastewater flowing through the diversion trough enters the photocatalytic component and then falls into the shell, and falls to the bottom of the shell after being filtered by the filter plate assembly. At this time, under the rotation of the bottom agitator, the wastewater at the bottom of the shell is pumped out to the treatment tank body, so that the wastewater in the treatment tank body circulates into the shell through the grooves on the upper part of the inner wall of the shell.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: the wastewater introduction system of the present invention sprays wastewater into the mixing drum, and the wastewater enters the diversion trough after being filtered by the filter screen at the bottom of the side of the mixing drum, and the wastewater enters the photocatalytic component to purify the wastewater. As the shaft rotates, the oxygenation mechanism oxygenates the wastewater after being filtered by the filter screen; the wastewater in the diversion trough falls into the shell, and falls to the bottom of the shell after being filtered by the filter plate assembly. At this time, under the rotation of the bottom agitator, the wastewater at the bottom of the shell is pumped out to the treatment tank body, so that the wastewater in the treatment tank body circulates into the shell through the slots on the upper part of the inner wall of the shell, which is beneficial to improve the circulation and filtering effect of the first filter plate and the second filter plate on the wastewater.

[0029] The present invention can realize stirring, aeration and filtration of pesticide wastewater in an integrated manner, thereby reducing equipment investment costs and achieving high pesticide wastewater treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the exploded structure of the overall assembly of the present invention;

[0031] Figure 2 It is a schematic diagram of the three-dimensional structure of the support base, the mounting frame, the second gear and the third gear installed on the treatment tank body of the present invention;

[0032] Figure 3 It is a schematic diagram of the exploded structure of the filter plate assembly and the filter stirring mechanism of the present invention;

[0033] Figure 4 It is a schematic diagram of the three-dimensional structure of the filter plate assembly and the filter stirring mechanism assembled according to the present invention;

[0034] Figure 5 It is a schematic diagram of the three-dimensional structure of the wastewater stirring and diverting photocatalytic mechanism of the present invention;

[0035] Figure 6 It is a schematic diagram of the exploded structure of the driving mechanism of the present invention;

[0036] Figure 7 It is a cross-sectional structural schematic diagram of the connection between the wastewater introduction system, the rotating shaft, the treatment tank body and the mixing drum of the present invention;

[0037] Figure 8 It is a schematic diagram of the three-dimensional structure of the wastewater stirring and diverting photocatalytic mechanism, the driving mechanism and the bottom stirring member connected in the present invention;

[0038] Fig. 9 It is a cross-sectional structural schematic diagram of the connection between the protruding seat, the diverter seat, the mixing drum and the rotating shaft of the present invention;

[0039] Fig.10 It is a cross-sectional structural schematic diagram of the connection between the treatment tank body, the wastewater stirring and diverting photocatalytic mechanism, the filtering and stirring mechanism and the filter plate assembly of the present invention;

[0040] Fig.11 It is a schematic diagram of the exploded structure of the oxygenation mechanism of the present invention;

[0041] Fig.12 It is a schematic diagram of the three-dimensional structure after the overall assembly of the present invention.

[0042] In the figure: 101, treatment tank body; 102, second gear; 103, third gear; 104, support seat; 105, mounting frame; 106, U-shaped groove; 2, protective shell; 3, oxygenation mechanism; 301, end cover; 302, protective net; 303, buckle seat; 304, air collecting blade; 305, annular air collecting disk; 306, air collecting box body; 307, branch pipe; 308, air guide pipe; 4, filtering and stirring mechanism; 401, first gear; 402, bottom rotating rod; 403, stirring plate; 404, third pulley; 405, shell; 406, slot; 407, support plate; 5, filter plate assembly; 501, first filter plate; 502, second filter plate; 6, wastewater stirring Diverter photocatalytic mechanism; 601, diverter seat; 602, stirring drum; 603, impurity discharge groove; 604, raised seat; 605, wastewater outflow outlet; 606, diverter groove; 607, connecting groove; 608, ultraviolet lamp; 609, transparent shell; 610, air duct; 611, nozzle; 612, aeration chamber; 613, filter screen; 7, driving mechanism; 701, motor; 702, first pulley; 703, first belt; 704, second belt; 705, spiral blade; 706, wastewater inlet pipe; 707, water diversion head; 7071, sealing ring; 7072, annular groove; 708, rotating shaft; 709, second pulley; 710, ejection hole; 711, channel. DETAILED DESCRIPTION

[0043] 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.

[0044] See also Figure 1 -12. The present invention provides a technical solution:

[0045] Embodiment 1:

[0046] A photocatalytic treatment device for pesticide wastewater, comprising a treatment tank body 101, wherein a wastewater stirring and diverting photocatalytic mechanism 6 is fixed on the upper part of the treatment tank body 101, and the wastewater stirring and diverting photocatalytic mechanism 6 comprises a diverting seat 601, a raised seat 604 arranged in the middle of the upper end of the diverting seat 601, diverting grooves 606 evenly distributed on both sides of the upper end of the diverting seat 601, a photocatalytic component arranged on the side wall of the diverting groove 606, and a mixing drum 602 extending through the raised seat 604;

[0047] A support seat 104 for supporting the diverter seat 601 is provided in the middle of the treatment tank body 101. The front and rear ends of the diverter seat 601 are fixed to the front and rear inner walls of the treatment tank body 101. The support seat 104 is used to divide the treatment tank body 101 into two left and right wastewater tanks for storing wastewater.

[0048] The photocatalytic component includes a transparent shell 609 embedded on the side wall of the diverter 606, a photocatalyst filled in the transparent shell 609, and an ultraviolet lamp 608 pre-buried in the photocatalyst;

[0049] The transparent shell 609 has water-permeable holes evenly distributed on the side, and the photocatalyst is activated carbon / nano-doped cobalt titanium dioxide / chitosan composite microspheres. After the wastewater enters the transparent shell 609 through the water-permeable holes, it is fully in contact with the activated carbon / nano-doped cobalt titanium dioxide / chitosan composite microspheres. The ultraviolet lamp 608 works, and the activated carbon / nano-doped cobalt titanium dioxide / chitosan composite microspheres absorb ultraviolet light to generate active free radicals for catalytic reaction. The active free radicals can oxidize organic waste molecules in the wastewater and decompose them into smaller and more harmless substances, thereby purifying the wastewater.

[0050] The processing tank body 101 is provided with a driving mechanism 7, and the driving mechanism 7 includes a motor 701 driving a rotating shaft 708, and the motor 701 is fixed on a mounting frame 105 at the rear end of the processing tank body 101;

[0051] The output end of the motor 701 is connected to a first pulley 702, and the rear end of the rotating shaft 708 passes through the mixing drum 602 and the treatment tank body 101 and is connected to a second pulley 709;

[0052] The bottom stirring member includes a bottom rotating rod 402 connected to the bottom of the housing 405 and a stirring plate 403 fixed on the surface of the bottom rotating rod 402, and a third pulley 404 connected after the rear end of a group of bottom rotating rods 402 penetrates the housing 405 and the treatment tank body 101;

[0053] A first belt 703 is connected between the first pulley 702 and the second pulley 709 . The first belt 703 passes through the U-shaped groove 106 on the mounting frame 105 . A second belt 704 is connected between the second pulley 709 and the third pulley 404 .

[0054] The front end of the bottom rotating rod 402 passes through the treatment tank body 101 and is connected to the first gear 401. The lower part of the rear end of the treatment tank body 101 is movably connected to the second gear 102 and the third gear 103 that are meshed with each other through a pin shaft. The two groups of first gears 401 are respectively meshed with the outer sides of the second gear 102 and the third gear 103; sealing gaskets are also sleeved on both ends of the bottom rotating rod 402, and the sealing gaskets are embedded in the treatment tank body 101. The sealing gaskets are used to achieve sealing at the connection between the bottom rotating rod 402 and the treatment tank body 101 to prevent the sewage in the treatment tank body 101 from seeping out from the gap at the connection between the bottom rotating rod 402 and the treatment tank body 101.

[0055] The front end of the treatment tank body 101 is also provided with a protective shell 2 for covering the first gear 401, the second gear 102 and the third gear 103;

[0056] Since the first belt 703 is connected between the first belt pulley 702 and the second belt pulley 709, and the second belt 704 is connected between the second belt pulley 709 and the third belt pulley 404, the motor 701 drives the rotating shaft 708 and the bottom rotating rod 402 to rotate simultaneously;

[0057] Since the two sets of first gears 401 are respectively meshed with the outer sides of the second gear 102 and the third gear 103, the bottom rotating rod 402 on the left and the bottom rotating rod 402 on the right also rotate synchronously;

[0058] The rotating shaft 708 drives the spiral blade 705 thereon to rotate in the mixing drum 602, so that the wastewater in the mixing drum 602 is filtered by the filter screen 613, and the wastewater impurities are pushed out through the impurity discharge groove 603 under the drive of the spiral blade 705;

[0059] The bottom rotating rod 402 drives the stirring plate 403 thereon to rotate, and while stirring the wastewater at the bottom of the shell 405, the wastewater at the bottom of the shell 405 can also be drawn away to form suction, so that the wastewater on the upper side of the shell 405 flows downward quickly and is filtered by the first filter plate 501 and the second filter plate 502 in sequence, which is conducive to improving the filtering effect of the first filter plate 501 and the second filter plate 502 on the wastewater;

[0060] The rotating shaft 708 at the front end of the driving mechanism 7 extends through the mixing drum 602 and is connected to the oxygenation mechanism 3. The oxygenation mechanism 3 includes an annular gas collecting plate 305 fixed at the front end of the mixing drum 602, a gas collecting blade 304 fixed after the front end of the rotating shaft 708 passes through the mixing drum 602 and extends into the annular gas collecting plate 305, a gas collecting box body 306 connected to the upper part of the rear end of the annular gas collecting plate 305, an air guide pipe 308 connected to the rear end of the air collecting box body 306, and a branch pipe 307 connected to the inner side of the air guide pipe 308;

[0061] The raised seat 604 is provided with an aeration chamber 612 located on both sides of the mixing drum 602. The aeration chamber 612 is connected to the diversion groove 606. A connecting groove 607 is provided between the aeration chamber 612 and the diversion groove 606. The outer end of the diversion groove 606 is provided with a wastewater outlet 605.

[0062] The branch pipe 307 is connected to the air passage 610 inside the raised seat 604 , and the bottom of the air passage 610 is connected to the nozzle 611 at the top of the aeration chamber 612 .

[0063] An end cover 301 is inserted into the front end of the annular gas collecting plate 305 , a protective net 302 is provided in the middle of the end cover 301 , and buckle seats 303 buckled on the annular gas collecting plate 305 are provided at the upper and lower ends of the end cover 301 .

[0064] The rotating shaft 708 drives the air collecting blades 304 to rotate in the annular air collecting plate 305, forming a negative pressure in the annular air collecting plate 305, so that the outside air can pass through the protective net 302 to enter the annular air collecting plate 305, and the air in the annular air collecting plate 305 can enter the air duct 610 through the air collecting box body 306, the air guide pipe 308 and the branch pipe 307, and finally be sprayed into the aeration chamber 612 through the nozzle 611. At this time, the air is in full contact with the wastewater that flows into the aeration chamber 612 after being filtered by the filter net 613, thereby achieving oxygenation of the wastewater.

[0065] The surface of the rotating shaft 708 is also fixed with a spiral blade 705 located in the mixing drum 602;

[0066] A filtering and stirring mechanism 4 located below the two ends of the diverter seat 601 is provided on both sides of the treatment tank body 101. The filtering and stirring mechanism 4 includes a housing 405, a filter plate assembly 5 arranged up and down inside the housing 405, and a bottom stirring member driven by a driving mechanism 7.

[0067] like Fig.10 As shown, the bottom of the shell 405 is a certain distance away from the bottom of the treatment tank body 101, and the top of the shell 405 is located at the bottom of the diverter seat 601, and the wastewater outlet 605 is located above the shell 405, so that the wastewater in the diverter slot 606 can fall into the shell 405 through the wastewater outlet 605;

[0068] A wastewater introduction system is also provided at the front end of the rotating shaft 708, and the wastewater introduction system includes a water diversion head 707 sleeved on the front end of the rotating shaft 708, the water diversion head 707 is fixed to the rear end of the mixing drum 602, and an annular groove 7072 connected to the channel 711 is provided in the middle of the water diversion head 707, and sealing rings 7071 located on both sides of the annular groove 7072 are embedded in the inner wall of the water diversion head 707, and the sealing ring 7071 is sleeved on the rotating shaft 708. The water diversion head 707 is provided with a wastewater introduction pipe 706 connected to the annular groove 7072.

[0069] The wastewater inlet pipe 706 is connected to the outlet of the sewage pump. When the sewage pump is working, the wastewater is introduced into the annular groove 7072 through the wastewater inlet pipe 706, and enters the spray hole 710 through the channel 711, until it is sprayed into the mixing drum 602 through the spray hole 710;

[0070] like Figure 7 As shown, such an arrangement allows wastewater to be introduced into the channel 711 and finally sprayed out through the spray hole 710 when the rotating shaft 708 rotates.

[0071] The wastewater introduction system introduces wastewater into the channel 711 inside the rotating shaft 708, and allows the wastewater to be sprayed into the mixing drum 602 through the spray hole 710 on the surface of the rotating shaft 708. Then, the wastewater is filtered by the filter screen 613 at the bottom of the side of the mixing drum 602 and enters the diversion groove 606. At this time, as the rotating shaft 708 rotates, the oxygenation mechanism 3 performs an oxygenation operation on the wastewater filtered by the filter screen 613.

[0072] When the wastewater is filtered by the filter net 613 at the bottom of the side of the mixing drum 602 and enters the diversion groove 606, the wastewater is evenly distributed, so that the wastewater enters each diversion groove 606 evenly, so that the wastewater will not overflow the diversion groove 606. At the same time, the photocatalytic component can fully photocatalytically treat the wastewater flowing through the diversion groove 606, thereby effectively achieving sufficient purification of the wastewater.

[0073] The wastewater in the diversion trough 606 falls into the shell 405, and falls to the bottom of the shell 405 after being filtered by the filter plate assembly 5. At this time, under the rotation of the bottom agitator, the wastewater at the bottom of the shell 405 is pumped out to the treatment tank body 101, so that the wastewater in the treatment tank body 101 circulates into the shell 405 through the groove 406 on the upper part of the inner wall of the shell 405, and the height of the groove 406 is higher than the filter plate assembly 5.

[0074] The filter plate assembly 5 includes a first filter plate 501 and a second filter plate 502 distributed up and down in a shell 405 . A support plate 407 for supporting the first filter plate 501 and the second filter plate 502 respectively is provided on the inner wall of the shell 405 . The slot 406 is higher than the first filter plate 501 .

[0075] An impurity discharge groove 603 is provided at the bottom of the front end of the mixing drum 602 which extends out of the processing tank body 101 .

[0076] The present invention also provides a method for treating pesticide wastewater using a photocatalytic treatment device, which specifically comprises the following steps:

[0077] S1. The wastewater introduction system introduces wastewater into the channel 711 inside the rotating shaft 708, and sprays the wastewater into the mixing drum 602 through the spray hole 710 on the surface of the rotating shaft 708. Then, the wastewater is filtered by the filter screen 613 at the bottom of the side of the mixing drum 602 and enters the diversion tank 606;

[0078] S2, at this time, with the rotation of the rotating shaft 708, the oxygenation mechanism 3 performs an oxygenation operation on the wastewater filtered by the filter screen 613;

[0079] S3. The wastewater flowing through the diversion groove 606 enters the photocatalytic component and then falls into the shell 405, and falls to the bottom of the shell 405 after being filtered by the filter plate assembly 5. At this time, under the rotation of the bottom agitator, the wastewater at the bottom of the shell 405 is pumped out to the treatment tank body 101, so that the wastewater in the treatment tank body 101 circulates into the shell 405 through the groove 406 on the upper part of the inner wall of the shell 405.

[0080] Specifically, when in use, the motor 701 drives the rotating shaft 708 and the bottom rotating rod 402 to rotate simultaneously. At the same time, under the operation of the sewage pump, the wastewater is introduced into the annular groove 7072 through the wastewater introduction pipe 706, and enters the spray hole 710 through the channel 711, until it is sprayed into the mixing drum 602 through the spray hole 710;

[0081] The spiral blade 705 on the rotating shaft 708 rotates in the mixing drum 602, so that the spiral blade 705 stirs the wastewater in the mixing drum 602. At the same time, the wastewater in the mixing drum 602 is filtered by the filter screen 613, and the wastewater impurities are pushed out through the impurity discharge groove 603 under the drive of the spiral blade 705.

[0082] The wastewater is filtered through the filter screen 613 and then enters the aeration chamber 612 and the diversion tank 606 in sequence;

[0083] At this time, the rotating shaft 708 drives the air collecting blades 304 to rotate in the annular air collecting plate 305, forming a negative pressure in the annular air collecting plate 305, so that the outside air passes through the protective net 302 and enters the annular air collecting plate 305, and the air in the annular air collecting plate 305 enters the air passage 610 through the air collecting box 306, the air guide pipe 308 and the branch pipe 307, and finally sprays into the aeration chamber 612 through the nozzle 611. At this time, the air is fully in contact with the wastewater that flows into the aeration chamber 612 after being filtered by the filter net 613, thereby playing a role in oxygenating the wastewater;

[0084] The wastewater flowing into the diversion trough 606 enters the transparent shell 609 through the water permeable hole and fully contacts with the activated carbon / nano-doped cobalt titanium dioxide / chitosan composite microspheres. The ultraviolet lamp 608 works, and the activated carbon / nano-doped cobalt titanium dioxide / chitosan composite microspheres absorb ultraviolet light to generate active free radicals for catalytic reaction. The active free radicals can oxidize organic waste molecules in the wastewater and decompose them into smaller and more harmless substances, thereby purifying the wastewater.

[0085] Subsequently, the wastewater falls into the shell 405, and the bottom rotating rod 402 drives the stirring plate 403 thereon to rotate. While stirring the wastewater at the bottom of the shell 405, the wastewater at the bottom of the shell 405 can also be drawn away to form suction, so that the wastewater on the upper side of the shell 405 flows downward quickly and is filtered by the first filter plate 501 and the second filter plate 502 in turn, which is beneficial to improving the circulation filtering effect of the first filter plate 501 and the second filter plate 502 on the wastewater.

[0086] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A photocatalytic treatment device for pesticide wastewater, comprising a treatment tank body, characterized in that: A wastewater stirring and diverting photocatalytic mechanism is fixed above the inside of the treatment tank body, and the wastewater stirring and diverting photocatalytic mechanism includes a diverting seat, a raised seat arranged in the middle of the upper end of the diverting seat, diverting grooves evenly distributed on both sides of the upper end of the diverting seat, a photocatalytic component arranged on the side wall of the diverting groove, and a stirring drum extending through the raised seat; The treatment tank body is provided with a driving mechanism, a rotating shaft at the front end of the driving mechanism extends through the mixing drum and is connected to an oxygenation mechanism, and a spiral blade located in the mixing drum is fixed on the surface of the rotating shaft; The two sides of the treatment tank body are provided with a filtering and stirring mechanism located below the two ends of the diverter seat, and the filtering and stirring mechanism includes a shell, a filter plate assembly arranged up and down inside the shell, and a bottom stirring member driven by a driving mechanism; The front end of the rotating shaft is also provided with a wastewater introduction system, which introduces wastewater into the channel inside the rotating shaft, and allows the wastewater to be sprayed into the mixing drum through the spray hole on the surface of the rotating shaft. Subsequently, the wastewater is filtered by the filter screen at the bottom of the side of the mixing drum and enters the diversion trough. At this time, as the rotating shaft rotates, the oxygenation mechanism performs an oxygenation operation on the wastewater filtered by the filter screen. The wastewater in the diversion trough falls into the shell, and falls to the bottom of the shell after being filtered by the filter plate assembly. At this time, under the rotation of the bottom agitator, the wastewater at the bottom of the shell is pumped out to the treatment tank body, so that the wastewater in the treatment tank body circulates into the shell through the grooves on the upper part of the inner wall of the shell, and the height of the grooves is higher than the filter plate assembly.

2. The photocatalytic treatment device for pesticide wastewater according to claim 1, characterized in that: The photocatalytic assembly comprises a transparent shell embedded in the side wall of the diverter trough, a photocatalyst filled in the transparent shell, and an ultraviolet lamp pre-buried in the photocatalyst; The transparent shell has water-permeable holes evenly distributed on its side, and the photocatalyst is activated carbon / nano-doped cobalt titanium dioxide / chitosan composite microspheres.

3. The photocatalytic treatment device for pesticide wastewater according to claim 1, characterized in that: The driving mechanism includes a motor for driving a rotating shaft, and the motor is fixed on a mounting frame at the rear end of the treatment tank body; The output end of the motor is connected to a first pulley, and the rear end of the rotating shaft passes through the mixing drum and the treatment tank body and is connected to a second pulley; The bottom stirring member includes a bottom rotating rod connected to the bottom of the shell and a stirring plate fixed on the surface of the bottom rotating rod, and a group of bottom rotating rods have rear ends that penetrate through the shell and the treatment tank body and are connected to a third pulley; A first belt is connected between the first pulley and the second pulley, and the first belt passes through the U-shaped groove on the mounting frame. A second belt is connected between the second pulley and the third pulley.

4. The photocatalytic treatment device for pesticide wastewater according to claim 3 is characterized in that: The front end of the bottom rotating rod passes through the treatment tank body and is connected to a first gear. The lower part of the rear end of the treatment tank body is movably connected to a second gear and a third gear that mesh with each other through a pin shaft. The two sets of first gears are respectively meshed with the outer sides of the second gear and the third gear. The filter plate assembly comprises a first filter plate and a second filter plate which are distributed up and down in a shell. A support plate for supporting the first filter plate and the second filter plate respectively is provided on the inner wall of the shell. The slot height is higher than that of the first filter plate.

5. The photocatalytic treatment device for pesticide wastewater according to claim 3 is characterized in that: The wastewater introduction system includes a water diversion head sleeved on the front end of the rotating shaft, the water diversion head is fixed on the rear end of the mixing drum, an annular groove connected to the channel is provided in the middle of the water diversion head, sealing rings located on both sides of the annular groove are embedded in the inner wall of the water diversion head, the sealing rings are sleeved on the rotating shaft, and a wastewater introduction pipe connected to the annular groove is provided on the water diversion head.

6. The photocatalytic treatment device for pesticide wastewater according to claim 5, characterized in that: The portion of the front end bottom of the mixing drum extending out of the treatment tank body is provided with an impurity discharge groove; The oxygen enrichment mechanism comprises an annular gas collecting plate fixed at the front end of the mixing drum, a gas collecting blade fixed behind the annular gas collecting plate and extending through the front end of the rotating shaft into the mixing drum, a gas collecting box body connected to the upper part of the rear end of the annular gas collecting plate, an air guide pipe connected to the rear end of the air collecting box body, and a branch pipe connected to the inner side of the air guide pipe; The raised seat is provided with an aeration chamber located on both sides of the mixing drum, the aeration chamber is connected with the diversion groove, a connecting groove is provided between the aeration chamber and the diversion groove, and a wastewater outflow outlet is provided at the outer end of the diversion groove; The branch pipe is communicated with the air passage inside the raised seat, and the bottom of the air passage is communicated with the nozzle at the top of the aeration chamber.

7. The photocatalytic treatment device for pesticide wastewater according to claim 6, characterized in that: An end cover is inserted into the front end of the annular gas collecting disk, a protective net is arranged in the middle of the end cover, and buckle seats buckled on the annular gas collecting disk are arranged at the upper and lower ends of the end cover.

8. A method for treating pesticide wastewater based on the photocatalytic treatment device according to any one of claims 1 to 7, characterized in that: The specific steps include: S1. The wastewater introduction system introduces wastewater into the channel inside the rotating shaft, and sprays the wastewater into the mixing drum through the spray holes on the surface of the rotating shaft. Then, the wastewater is filtered by the filter screen at the bottom of the side of the mixing drum and enters the diversion tank; S2. At this time, as the shaft rotates, the oxygenation mechanism performs oxygenation operation on the wastewater filtered by the filter screen; S3. The wastewater flowing through the diversion trough enters the photocatalytic component and then falls into the shell, and falls to the bottom of the shell after being filtered by the filter plate assembly. At this time, under the rotation of the bottom agitator, the wastewater at the bottom of the shell is pumped out to the treatment tank body, so that the wastewater in the treatment tank body circulates into the shell through the grooves on the upper part of the inner wall of the shell.

Images