CN113003778B

CN113003778B - Method for treating industrial wastewater containing harmful metal ions

Info

Publication number: CN113003778B
Application number: CN202110266055.7A
Authority: CN
Inventors: 张宁; 闫芳林
Original assignee: Guangzhou Bangsen Chemical Technology Co ltd
Current assignee: Guangzhou Bangsen Chemical Technology Co ltd
Priority date: 2021-03-11
Filing date: 2021-03-11
Publication date: 2023-05-02
Anticipated expiration: 2041-03-11
Also published as: CN113003778A

Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for treating industrial wastewater containing harmful metal ions, which comprises the following steps: step one, primary filtration: performing primary filtration on industrial wastewater containing harmful metal ions to remove solid impurities in the wastewater; step two, neutralizing and precipitating: lime is added into the wastewater after primary filtration, flocculant is added after uniform stirring, and the stirring is continued to be uniform; step three, two-stage filtration: performing secondary filtration on the wastewater after the neutralization and precipitation in the second step, and removing floccules in the wastewater; wherein, the third step is completed by adopting an industrial wastewater treatment device containing harmful metal ions. The invention promotes the waste water after eliminating the metal ions to pass through the annular filter plate quickly under the action of air pressure, and improves the filtering speed. The invention avoids the situation that flocculent hydroxide remains on the surface of the filter plate to block the filter holes of the filter plate, and further improves the filtering speed.

Description

Method for treating industrial wastewater containing harmful metal ions

Technical Field

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for treating industrial wastewater containing harmful metal ions.

Background

Industrial wastewater includes production wastewater, production sewage and cooling water, and refers to wastewater and waste liquid generated in an industrial production process, wherein the wastewater contains industrial production materials, intermediate products and byproducts which run off along with water, and pollutants generated in the production process. Industrial wastewater has various types and complex components; for example, the industrial wastewater of the electrolytic salt contains mercury, and the industrial wastewater of the heavy metal smelting contains various metals such as lead, cadmium and the like. Because the metal ions often contained in the industrial wastewater pollute the environment and cause great harm to human health, the industrial wastewater can be discharged after corresponding purification measures are adopted for disposal. The current method for removing metal ions in industrial wastewater comprises a neutralization precipitation method, a sulfide precipitation method, a solvent extraction separation method and the like, wherein the neutralization precipitation method is a common method.

The neutralization precipitation method is a method of adding lime to wastewater containing metal ions to perform a neutralization reaction, and separating the metal ions into a water-insoluble hydroxide precipitation form. The following problems exist in the current use process of the neutralization precipitation method: when the flocculent hydroxide is filtered, only a filter plate with smaller pore diameter can be used for filtering due to smaller flocculent hydroxide particles. Flocculent hydroxide remains on the surface of the filter plate to block the filter holes of the filter plate and cannot be cleaned in time, and the filtering speed is affected.

Disclosure of Invention

First, the technical problem to be solved

The invention provides a method for treating industrial wastewater containing harmful metal ions, which aims to solve the following problems in the prior art when the industrial wastewater containing the harmful metal ions is treated by a neutralization precipitation method: when the flocculent hydroxide is filtered, only a filter plate with smaller pore diameter can be used for filtering due to smaller flocculent hydroxide particles. Flocculent hydroxide remains on the surface of the filter plate to block the filter holes of the filter plate and cannot be cleaned in time, and the filtering speed is affected.

(II) technical scheme

In order to solve the technical problems, the invention adopts the following technical scheme:

a method for treating industrial wastewater containing harmful metal ions comprises the following steps:

step one, primary filtration: and (3) carrying out primary filtration on the industrial wastewater containing the harmful metal ions to remove solid impurities in the wastewater.

Step two, neutralizing and precipitating: lime is added into the wastewater after the primary filtration, and flocculant is added after uniform stirring, and the stirring is continued to be uniform.

Step three, two-stage filtration: and (3) carrying out secondary filtration on the wastewater after the neutralization and precipitation in the step two, and removing floccules in the wastewater.

The third step is completed by adopting a device for treating the industrial wastewater containing the harmful metal ions, wherein the device for treating the industrial wastewater containing the harmful metal ions comprises a horizontal circular bottom plate, a plurality of supporting legs are fixedly arranged on the lower surface of the circular bottom plate, and a water outlet is vertically and penetratingly formed in the middle of the circular bottom plate. The upper surface of the round bottom plate is vertically and fixedly provided with a mounting cylinder which coincides with the axis of the round bottom plate. The inner wall of the mounting cylinder is fixedly provided with a supporting block, and a cover plate which coincides with the axis of the mounting cylinder is arranged through the supporting block. The inner wall of the mounting cylinder is horizontally and fixedly provided with a mounting ring which is overlapped with the axis of the mounting cylinder and is positioned below the cover plate, the inner circumferential surface of the mounting ring is horizontally and fixedly provided with an annular filter plate which is overlapped with the axis of the mounting ring, and the inner circumferential surface of the annular filter plate is fixedly provided with a mounting block which is overlapped with the axis of the annular filter plate. A water inlet is formed in the side wall of the mounting cylinder in a penetrating mode, and a sealing plug is mounted at the water inlet. And (3) conveying the wastewater after the neutralization and precipitation in the step two into an installation cylinder from a water inlet, wherein the wastewater is reserved above an installation ring, an annular filter plate and an installation block, slowly leaks downwards through the annular filter plate, and flocculent hydroxide is reserved on the upper surface of the annular filter plate.

The upper surface of the mounting block is rotatably provided with a rotating shaft which coincides with the axis of the mounting block, and the surface of the rotating shaft is provided with a material pressing mechanism through a thread groove. The pressing mechanism comprises a pressing disc in threaded fit with the rotating shaft. A vertical groove is formed in the inner wall of the mounting cylinder, and a sliding block which is in sliding fit with the vertical groove is fixedly arranged on the pressure plate. The water inlet is sealed through the sealing plug, the pressing disc and the sliding block are driven by the rotating shaft to move downwards along the vertical groove, the pressure of air below the pressing disc is increased after the air is extruded, the pressure is applied to the waste water through the air pressure effect, and the waste water passes through the annular filter plate downwards in an accelerating mode under the pressure effect.

The rotary shaft is fixedly provided with a mounting disc which is overlapped with the axis of the rotary shaft and is positioned below the pressure disc, the outer circumferential surface of the mounting disc is uniformly and fixedly provided with a plurality of connecting arms along the circumferential direction of the mounting disc, and the end parts of the connecting arms are fixedly provided with scraping mechanisms. The scraping mechanism comprises a strip-shaped block fixedly connected to the end part of the connecting arm and arranged along the length direction of the connecting arm. The bottom surface of the strip-shaped block is vertically and fixedly provided with a front baffle and a rear baffle which are parallel to each other. The bottom surface of the strip-shaped block is vertically and fixedly provided with an end plate which is fixedly connected with the end surfaces of the front baffle and the rear baffle. The surface of the rear baffle plate facing the front baffle plate is provided with a scraping plate. The end face of the scraping plate is matched with the surface of the end plate. The surface of the scraping plate facing the front baffle is inclined, and the bottom surface of the front baffle is matched with the surface of the scraping plate facing the front baffle. The rotating shaft drives the mounting plate, the connecting arm and the scraping mechanism to synchronously rotate in the rotating process. In this process, the scraping plate scrapes the flocculent hydroxide on the upper surface of the annular filter plate, and the flocculent hydroxide is accumulated on the upper surface of the scraping plate and remains among the front baffle, the rear baffle and the end plate.

The top of the rotating shaft penetrates through the cover plate and is horizontally and fixedly provided with a first conical fluted disc, the upper surface of the cover plate is horizontally and fixedly provided with a driving motor, and the end part of an output shaft of the driving motor is fixedly provided with a first incomplete conical fluted disc which is meshed with the first conical fluted disc. And a material taking mechanism corresponding to the scraping mechanism is arranged on the side wall of the mounting cylinder. The first incomplete bevel gear disk is driven by the driving motor to continuously rotate, the first incomplete bevel gear disk drives the first bevel gear disk and the rotating shaft to intermittently rotate, when the rotating shaft rotates, the scraping mechanism scrapes flocculent hydroxide on the upper surface of the annular filter plate, and when the rotating shaft is static, the material taking mechanism takes the flocculent hydroxide scraped in the scraping mechanism.

As a preferable technical scheme of the invention, a supporting rod is fixedly arranged between the inner circumferential surface of the mounting ring and the outer circumferential surface of the mounting block; the supporting rod plays a supporting role on the installation block, so that the installation block and the annular filter plate are prevented from shaking, and the upper surface level of the annular filter plate is ensured. And further ensures that the scraping mechanism can effectively scrape flocculent hydroxide on the upper surface of the annular filter plate.

As a preferable technical scheme of the invention, the lower surface of the pressure plate is uniformly provided with a plurality of vertical internal thread sleeves in a rotating way along the circumferential direction. The external surface of the internal thread sleeve is uniformly and fixedly provided with a plurality of horizontal stirring plates along the circumferential direction. The lower surface of the cover plate is vertically and fixedly provided with an external threaded rod which is matched with the internal threaded sleeve at the position corresponding to the internal threaded sleeve. When the pressure plate moves downwards, the internal thread sleeve and the stirring plate are driven to move downwards, the interaction of the internal thread sleeve and the external threaded rod drives the internal thread sleeve to rotate, and when the internal thread sleeve rotates, the stirring plate is driven to rotate. The stirring plate drives wastewater to flow when rotating, so that flocculent hydroxide is uniformly distributed on the upper surface of the annular filter plate, and the condition that the flocculent hydroxide on the upper surface of the annular filter plate is gathered together to cause the scraping effect of the scraping mechanism to be reduced is avoided.

As a preferable technical scheme of the invention, the upper surface of the circular bottom plate is fixedly provided with the material guiding disc, and the upper surface of the material guiding disc is in a conical surface so as to ensure that wastewater passing through the annular filter plate can smoothly flow to the water outlet.

As a preferable technical scheme of the invention, the material taking mechanism comprises a material taking opening which horizontally penetrates through the side wall of the mounting cylinder, and a horizontal rod is arranged in the material taking opening. The end face of the horizontal rod, which faces the inner side of the mounting cylinder, is fixedly provided with a hairbrush roller, and the end part of the hairbrush roller is fixedly provided with a sealing piece matched with the material taking opening so as to prevent waste water from entering the material taking opening. The first magnet blocks are inlaid on the bottom surface of the scraping plate, and the second magnet blocks are fixedly arranged on the upper surface of the mounting ring at positions corresponding to the first magnet blocks. When the rotating shaft is static, the flocculent hydroxide scraped in the scraping mechanism is taken by the taking mechanism; the specific steps are as follows: after the rotating shaft, the mounting disc, the connecting arm and the scraping mechanism are static, the first magnet block is located at the position above the second magnet block, repulsive force is generated between the first magnet block and the second magnet block, and the scraping plate is pushed to rise by the action of the repulsive force until the scraping plate is attached to the front baffle. The brush roller is driven by the movable horizontal rod to extend into the space between the front baffle, the rear baffle, the end plate and the scraping plate, and the flocculent hydroxide between the front baffle, the rear baffle, the end plate and the scraping plate is collected on the surface of the brush roller. The horizontal rod is moved to drive the brush roller to move out for resetting, so that the flocculent hydroxide in the scraping mechanism is taken out.

As a preferable technical scheme of the invention, the installation cylinder is internally provided with a water inlet groove which is positioned above the material taking opening and communicated with the material taking opening, and the installation cylinder is internally provided with a water outlet groove which is positioned below the material taking opening and communicated with the material taking opening. Water pipes are fixedly arranged at the water inlet tank and the water outlet tank ports. An annular water receiving tank is fixedly arranged below the water outlet tank on the outer wall of the mounting cylinder. The clean water is injected into the material taking opening through the water inlet groove, and the clean water cannot flow downwards when the horizontal rod is positioned in the material taking opening. After the brush roller is used for taking materials, the brush roller is driven to move into the material taking opening through the movable horizontal rod, clean water can downwards flow to wash flocculent hydroxide on the surface of the brush roller, and the flocculent hydroxide after washing enters the water outlet tank and finally flows into the water receiving tank.

As a preferable technical scheme of the invention, the surface of the horizontal rod is provided with a spiral groove, and the horizontal rod is matched with the material taking opening through the spiral groove. The end surface of the horizontal rod far away from the inner side of the mounting cylinder is fixedly provided with a gear rod which coincides with the axis of the horizontal rod. The first horizontal shaft is rotatably arranged on the outer wall of the mounting cylinder at a position corresponding to the gear rod, and a gear disc meshed with the gear rod is fixedly arranged on the first horizontal shaft. An elastic rope in a tensioning state is fixedly connected between the end face of the gear disc and the outer wall of the mounting cylinder. A first bobbin is fixedly mounted on the first horizontal shaft.

The driving motor is a double-shaft motor, and a second incomplete conical fluted disc is fixedly arranged at the end part of an output shaft of the driving motor. The top surface of the mounting cylinder is rotatably provided with a vertical shaft corresponding to the position of the second incomplete conical fluted disc, and the vertical shaft is fixedly provided with the second conical fluted disc which is meshed with the second incomplete conical fluted disc. The position on the outer wall of the mounting cylinder corresponding to the second conical fluted disc is rotatably provided with a second horizontal shaft through a bracket, and one end of the second horizontal shaft is fixedly provided with a third conical fluted disc meshed with the second conical fluted disc. The other end of the second horizontal shaft is fixedly provided with a second winding drum corresponding to the first winding drum. A pull wire is connected between the first winding reel and the second winding reel. After the rotating shaft, the mounting plate, the connecting arm and the scraping mechanism are static, the second incomplete conical fluted disc and the second conical fluted disc enter a meshing state, and the second conical fluted disc and the vertical shaft rotate and drive the third conical fluted disc, the second horizontal shaft and the second winding drum to rotate. When the second winding reel rotates, the pull wire is driven to move, the pull wire pulls the first winding reel, the first horizontal shaft and the gear disc to rotate, and the elastic rope is deformed in a torsion mode. The gear plate drives the gear rod and the horizontal rod to rotate when rotating, so that the brush roller is driven to extend into the space between the front baffle plate, the rear baffle plate, the end plate and the scraping plate for taking materials. After the second incomplete conical fluted disc and the second conical fluted disc are separated from the meshed state, the elastic rope is restored to the initial state, so that the first winding reel, the first horizontal shaft and the gear disc are driven to rotate and reset, and the first winding reel pulls the second winding reel, the third conical fluted disc and the second horizontal shaft to rotate and reset through the pull wire; the second conical fluted disc and the vertical shaft are synchronously reset. Through the structure, the effect of mutually coordinated work of the scraping mechanism and the material taking mechanism driven by the driving motor is realized, the labor is saved, and the efficiency is improved.

(III) beneficial effects

The invention has at least the following beneficial effects:

(1) The invention solves the following problems in the treatment of industrial wastewater containing harmful metal ions by a neutralization precipitation method: when the flocculent hydroxide is filtered, the flocculent hydroxide particles are smaller, and only a filter plate with smaller pore diameter can be used for filtering, so that the filtering speed is very low. Flocculent hydroxide remains on the surface of the filter plate to block the filter holes of the filter plate and cannot be cleaned in time, and the filtering speed is affected.

(2) According to the invention, industrial wastewater containing harmful metal ions is treated by a neutralization precipitation method, and when the secondary filtration is carried out on the wastewater added with lime, the pressure is applied to the air above the wastewater by the material pressing mechanism, so that the rapid passing of the wastewater after the metal ions are eliminated through the annular filter plate is promoted by the action of air pressure, and the filtration speed is improved.

(3) When the secondary filtration is carried out on the wastewater after lime is added, the flocculent hydroxide on the surface of the annular filter plate is scraped by the scraping mechanism, and the scraped flocculent hydroxide is taken and cleaned by the taking mechanism, so that the condition that the flocculent hydroxide remains on the surface of the filter plate to block the filter holes of the filter plate is avoided, and the filtration speed is further improved.

Drawings

The invention will be further described with reference to the drawings and examples.

FIG. 1 is a step diagram of a method for treating industrial wastewater containing hazardous metal ions according to an embodiment of the present invention;

FIG. 2 is a schematic diagram showing the internal structure of an industrial wastewater treatment device containing hazardous metal ions according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of FIG. 2 at A;

FIG. 4 is an enlarged schematic view at B in FIG. 2;

FIG. 5 is an enlarged schematic view of FIG. 2 at C;

FIG. 6 is an enlarged schematic view of FIG. 2D;

FIG. 7 is a schematic perspective view of a scraping mechanism according to an embodiment of the present invention;

fig. 8 is a schematic perspective view of a pressing mechanism according to an embodiment of the present invention.

In the figure: 1-round bottom plate, 2-water outlet, 3-mounting cylinder, 4-cover plate, 5-mounting ring, 6-ring filter plate, 7-mounting block, 8-rotating shaft, 9-material pressing mechanism, 91-pressure plate, 92-sliding block, 93-internal screw sleeve, 94-stirring plate, 10-vertical groove, 11-mounting plate, 12-connecting arm, 13-scraping mechanism, 131-bar block, 132-front baffle, 133-rear baffle, 134-end plate, 135-scraping plate, 136-first magnet block, 14-first conical fluted disc, 15-driving motor, 16-first incomplete conical fluted disc, 17-material taking mechanism 171-material taking opening, 172-horizontal rod, 173-brush roller, 174-sealing piece, 175-water inlet groove, 176-water outlet groove, 177-water receiving tank, 178-gear rod, 179-first horizontal shaft, 1710-gear disc, 1711-elastic rope, 1712-first winding drum, 18-water inlet, 19-sealing plug, 20-supporting rod, 21-external threaded rod, 22-material guiding disc, 23-second magnet block, 24-second incomplete conical fluted disc, 25-vertical shaft, 26-second conical fluted disc, 27-second horizontal shaft, 28-third conical fluted disc, 29-second winding drum and 30-stay wire.

Detailed Description

Embodiments of the invention are described in detail below with reference to the attached drawings, but the invention can be implemented in a number of different ways, which are defined and covered by the claims.

As shown in fig. 1, the embodiment provides a method for treating industrial wastewater containing hazardous metal ions, which comprises the following steps:

The third step is completed by adopting the industrial wastewater treatment device containing the metal ions, as shown in fig. 2 to 8, wherein the industrial wastewater treatment device containing the metal ions comprises a horizontal circular bottom plate 1, a plurality of supporting legs are fixedly arranged on the lower surface of the circular bottom plate 1, and a water outlet 2 is vertically and penetratingly formed in the middle of the circular bottom plate 1. The upper surface of the circular bottom plate 1 is vertically and fixedly provided with a mounting cylinder 3 which coincides with the axis of the circular bottom plate. The inner wall of the installation cylinder 3 is fixedly provided with a supporting block, and a cover plate 4 which coincides with the axis of the installation cylinder 3 is arranged through the supporting block. The inner wall of the mounting cylinder 3 is horizontally and fixedly provided with a mounting ring 5 which is overlapped with the axis of the mounting cylinder 3 and is positioned below the cover plate 4, the inner circumferential surface of the mounting ring 5 is horizontally and fixedly provided with an annular filter plate 6 which is overlapped with the axis of the mounting ring, and the inner circumferential surface of the annular filter plate 6 is fixedly provided with a mounting block 7 which is overlapped with the axis of the annular filter plate. The side wall of the mounting cylinder 3 is provided with a water inlet 18 in a penetrating way, and a sealing plug 19 is arranged at the water inlet 18. And (3) conveying the wastewater after the neutralization and precipitation in the step (II) into the installation cylinder (3) from the water inlet (18), wherein the wastewater is reserved above the installation ring (5), the annular filter plate (6) and the installation block (7), slowly leaks downwards through the annular filter plate (6), and flocculent hydroxide is reserved on the upper surface of the annular filter plate (6). The upper surface of the circular bottom plate 1 is fixedly provided with a guide disc 22, and the upper surface of the guide disc 22 is conical, so that the wastewater passing through the annular filter plate 6 can smoothly flow to the water outlet 2. A supporting rod 20 is fixedly arranged between the inner circumferential surface of the mounting ring 5 and the outer circumferential surface of the mounting block 7; the supporting rod 20 plays a supporting role on the installation block 7, so that the installation block 7 and the annular filter plate 6 cannot shake, and the upper surface level of the annular filter plate 6 is guaranteed. And further ensures that the scraping mechanism 13 can effectively scrape the flocculent hydroxide on the upper surface of the annular filter plate 6.

The upper surface of the mounting block 7 is rotatably provided with a rotating shaft 8 which coincides with the axis of the mounting block, and the surface of the rotating shaft 8 is provided with a material pressing mechanism 9 through a thread groove. The pressing mechanism 9 comprises a pressing plate 91 in threaded fit with the rotating shaft 8. The inner wall of the mounting cylinder 3 is provided with a vertical groove 10, and a slide block 92 which is in sliding fit with the vertical groove 10 is fixedly arranged on the pressure plate 91. The water inlet 18 is sealed through the sealing plug 19, the pressing disc 91 and the sliding block 92 are driven to move downwards along the vertical groove 10 through the rotating shaft 8, the pressure of air below the pressing disc 91 is increased after the air is extruded, so that the waste water is pressurized through the air pressure effect, and the waste water passes through the annular filter plate 6 in an accelerating mode under the pressure effect.

The rotary shaft 8 is fixedly provided with a mounting plate 11 which is positioned below the pressure plate 91 and coincides with the axis of the rotary shaft, the outer circumferential surface of the mounting plate 11 is uniformly and fixedly provided with a plurality of connecting arms 12 along the circumferential direction of the mounting plate, and the end parts of the connecting arms 12 are fixedly provided with scraping mechanisms 13. The scraping mechanism 13 includes a bar-shaped block 131 fixedly connected to an end of the connecting arm 12 and arranged along a length direction of the connecting arm 12. The bottom surface of the bar 131 is vertically and fixedly provided with a front baffle 132 and a rear baffle 133 which are parallel to each other. The bottom surface of the bar 131 is vertically and fixedly provided with an end plate 134 fixedly connected with the end surfaces of the front baffle 132 and the rear baffle 133. The surface of the rear baffle 133 facing the front baffle 132 is mounted with a scraper 135. The end surface of the scraper plate 135 is fitted with the surface of the end plate 134. The surface of the scraping plate 135 facing the front baffle 132 is inclined, and the bottom surface of the front baffle 132 is matched with the surface of the scraping plate 135 facing the front baffle 132. The rotating shaft 8 drives the mounting plate 11, the connecting arm 12 and the scraping mechanism 13 to synchronously rotate in the rotating process. In this process, the scraping plate 135 scrapes off the flocculent hydroxide on the upper surface of the annular filter plate 6, and the flocculent hydroxide is accumulated on the upper surface of the scraping plate 135 and remains between the front baffle 132, the rear baffle 133 and the end plate 134.

The top of the rotating shaft 8 penetrates through the cover plate 4 and is horizontally and fixedly provided with a first conical fluted disc 14, the upper surface of the cover plate 4 is horizontally and fixedly provided with a driving motor 15, and the end part of an output shaft of the driving motor 15 is fixedly provided with a first incomplete conical fluted disc 16 which is meshed with the first conical fluted disc 14. And a material taking mechanism 17 corresponding to the scraping mechanism 13 is arranged on the side wall of the mounting cylinder 3. The first incomplete conical fluted disc 16 is driven to continuously rotate through the driving motor 15, the first incomplete conical fluted disc 16 drives the first conical fluted disc 14 and the rotating shaft 8 to intermittently rotate, when the rotating shaft 8 rotates, the scraping mechanism 13 scrapes flocculent hydroxide on the upper surface of the annular filter plate 6, and when the rotating shaft 8 is static, the material taking mechanism 17 takes the flocculent hydroxide scraped in the scraping mechanism 13.

The lower surface of the pressure plate 91 is uniformly rotatably provided with a plurality of vertical internal thread sleeves 93 along the circumferential direction thereof. The outer surface of the female screw sleeve 93 is uniformly and fixedly provided with a plurality of horizontal agitating plates 94 along the circumferential direction thereof. The lower surface of the cover plate 4 is vertically and fixedly provided with an external threaded rod 21 which is matched with the internal threaded sleeve 93 at a position corresponding to the internal threaded sleeve 93. The pressing plate 91 moves downwards to drive the internal thread sleeve 93 and the stirring plate 94 to move downwards, the interaction of the internal thread sleeve 93 and the external threaded rod 21 drives the internal thread sleeve 93 to rotate, and the internal thread sleeve 93 rotates to drive the stirring plate 94 to rotate. The stirring plate 94 drives the wastewater to flow when rotating, so that flocculent hydroxide is uniformly distributed on the upper surface of the annular filter plate 6, and the condition that the flocculent hydroxide on the upper surface of the annular filter plate 6 is gathered together to reduce the scraping effect of the scraping mechanism 13 is avoided.

The material taking mechanism 17 comprises a material taking opening 171 which horizontally penetrates through the side wall of the mounting cylinder 3, and a horizontal rod 172 is mounted in the material taking opening 171. A brush roller 173 is fixedly mounted on the end surface of the horizontal rod 172 facing the inner side of the mounting cylinder 3, and a sealing piece 174 matched with the material taking opening 171 is fixedly mounted on the end part of the brush roller 173 so as to prevent waste water from entering the material taking opening 171. The first magnet 136 is inlaid on the bottom surface of the scraping plate 135, and the second magnet 23 is fixedly arranged on the upper surface of the mounting ring 5 at a position corresponding to the first magnet 136. When the rotating shaft 8 is static, the flocculent hydroxide scraped in the scraping mechanism 13 is extracted through the extracting mechanism 17; the specific steps are as follows: after the rotating shaft 8, the mounting plate 11, the connecting arm 12 and the scraping mechanism 13 are static, the first magnet 136 is located at the position above the second magnet 23, repulsive force is generated between the first magnet 136 and the second magnet 23, and the scraping plate 135 is pushed to rise by the action of the repulsive force until the scraping plate 135 is attached to the front baffle 132. The brush roller 173 is driven to extend into the space between the front baffle 132, the rear baffle 133, the end plate 134 and the scraper 135 by moving the horizontal rod 172, and the brush roller 173 collects the flocculent hydroxide between the front baffle 132, the rear baffle 133, the end plate 134 and the scraper 135 on its surface. The brush roller 173 is driven to move out and reset by moving the horizontal rod 172, so that the flocculent hydroxide in the scraping mechanism 13 is taken out.

The installation cylinder 3 is internally provided with a water inlet groove 175 which is positioned above the material taking opening 171 and is communicated with the material taking opening 171, and the installation cylinder 3 is internally provided with a water outlet groove 176 which is positioned below the material taking opening 171 and is communicated with the material taking opening 171. Water pipes are fixedly arranged at the ports of the water inlet tank 175 and the water outlet tank 176. An annular water receiving tank 177 is fixedly arranged on the outer wall of the mounting cylinder 3 below the water outlet groove 176. Fresh water is injected into the material taking opening 171 through the water inlet groove 175, and when the horizontal rod 172 is positioned in the material taking opening 171, the fresh water does not flow downwards. After the brush roller 173 is used for taking materials, the horizontal rod 172 is moved to drive the brush roller 173 to move into the material taking opening 171, clean water can downwards flow to wash flocculent hydroxide on the surface of the brush roller 173, and the flocculent hydroxide after washing enters the water outlet groove 176 and finally flows into the water receiving tank 177.

The surface of the horizontal rod 172 is provided with a spiral groove, and the horizontal rod 172 is matched with the material taking opening 171 through the spiral groove. A gear rod 178 which coincides with the axis of the horizontal rod 172 is fixedly mounted on the end surface of the horizontal rod 172 far from the inner side of the mounting cylinder 3. A first horizontal shaft 179 is rotatably mounted on the outer wall of the mounting cylinder 3 at a position corresponding to the gear rod 178, and a gear disk 1710 engaged with the gear rod 178 is fixedly mounted on the first horizontal shaft 179. An elastic rope 1711 in a tensioning state is fixedly connected between the end face of the gear plate 1710 and the outer wall of the mounting cylinder 3. A first bobbin 1712 is fixedly mounted on the first horizontal shaft 179.

The driving motor 15 is a double-shaft motor, and a second incomplete conical fluted disc 24 is fixedly arranged at the end part of an output shaft of the driving motor 15. The top surface of the mounting cylinder 3 is rotatably provided with a vertical shaft 25 corresponding to the position of the second incomplete conical fluted disc 24, and the vertical shaft 25 is fixedly provided with a second conical fluted disc 26 which is meshed with the second incomplete conical fluted disc 24. A second horizontal shaft 27 is rotatably arranged on the outer wall of the mounting cylinder 3 at a position corresponding to the second conical fluted disc 26 through a bracket, and a third conical fluted disc 28 meshed with the second conical fluted disc 26 is fixedly arranged at one end of the second horizontal shaft 27. A second bobbin 29 corresponding to the first bobbin 1712 is fixedly attached to the other end of the second horizontal shaft 27. A pull cord 30 is connected between the first bobbin 1712 and the second bobbin 29. After the rotating shaft 8, the mounting plate 11, the connecting arm 12 and the scraping mechanism 13 are static, the second incomplete conical fluted disc 24 and the second conical fluted disc 26 enter a meshed state, and the second conical fluted disc 26 and the vertical shaft 25 rotate and drive the third conical fluted disc 28, the second horizontal shaft 27 and the second winding drum 29 to rotate. When the second bobbin 29 rotates, the pulling wire 30 is driven to move, the pulling wire 30 pulls the first bobbin 1712, the first horizontal shaft 179 and the gear disc 1710 to rotate, and the elastic cord 1711 is deformed in torsion. When the gear disk 1710 rotates, it drives the gear rod 178 and the horizontal rod 172 to rotate, so as to drive the brush roller 173 to extend into the space between the front baffle 132, the rear baffle 133, the end plate 134 and the scraping plate 135 for taking materials. After the second incomplete conical fluted disc 24 and the second conical fluted disc 26 are disengaged, the elastic rope 1711 returns to the original state, so that the first bobbin 1712, the first horizontal shaft 179 and the gear disc 1710 are driven to rotate and reset, and the first bobbin 1712 pulls the second bobbin 29, the third conical fluted disc 28 and the second horizontal shaft 27 to rotate and reset through the pull wire 30; the second conical toothed disc 26 and the vertical shaft 25 are reset synchronously. Through the structure, the effect that the scraping mechanism 13 and the material taking mechanism 17 are driven by the driving motor 15 to work in a mutually coordinated manner is achieved, labor is saved, and efficiency is improved.

The working process of the industrial wastewater treatment device containing the harmful metal ions in the embodiment is as follows: and (3) conveying the wastewater after the neutralization and precipitation in the step (II) into the installation cylinder (3) from the water inlet (18), wherein the wastewater is reserved above the installation ring (5), the annular filter plate (6) and the installation block (7), slowly leaks downwards through the annular filter plate (6), and flocculent hydroxide is reserved on the upper surface of the annular filter plate (6). The water inlet 18 is sealed through the sealing plug 19, the rotating shaft 8 is driven to intermittently rotate through the driving motor 15, so that the pressure plate 91 and the sliding block 92 are driven to intermittently move downwards along the vertical groove 10, the pressure of air below the pressure plate 91 is increased after the air is extruded, the waste water is pressurized through the air pressure effect, and the waste water is accelerated to pass through the annular filter plate 6 under the pressure effect. When the rotating shaft 8 rotates, the scraping mechanism 13 scrapes flocculent hydroxide on the upper surface of the annular filter plate 6, and when the rotating shaft 8 is static, the material taking mechanism 17 takes the flocculent hydroxide scraped in the scraping mechanism 13. The above process is continued until the total filtration of the wastewater is completed.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for treating industrial wastewater containing hazardous metal ions, which is characterized by comprising the following steps:

step one, primary filtration: performing primary filtration on industrial wastewater containing harmful metal ions to remove solid impurities in the wastewater;

step two, neutralizing and precipitating: lime is added into the wastewater after primary filtration, flocculant is added after uniform stirring, and the stirring is continued to be uniform;

step three, two-stage filtration: performing secondary filtration on the wastewater after the neutralization and precipitation in the second step, and removing floccules in the wastewater;

the third step is completed by adopting a device for treating the industrial wastewater containing the harmful metal ions, wherein the device for treating the industrial wastewater containing the harmful metal ions comprises a horizontal circular bottom plate (1), a plurality of supporting legs are fixedly arranged on the lower surface of the circular bottom plate (1), and a water outlet (2) is vertically and penetratingly arranged in the middle of the circular bottom plate (1); the upper surface of the circular bottom plate (1) is vertically and fixedly provided with a mounting cylinder (3) which coincides with the axis of the circular bottom plate; a supporting block is fixedly arranged on the inner wall of the mounting cylinder (3), and a cover plate (4) which is overlapped with the axis of the mounting cylinder (3) is arranged through the supporting block; a mounting ring (5) which is overlapped with the axis of the mounting cylinder (3) is horizontally and fixedly arranged below the cover plate (4) on the inner wall of the mounting cylinder (3), an annular filter plate (6) which is overlapped with the axis of the mounting ring is horizontally and fixedly arranged on the inner circumferential surface of the mounting ring (5), and a mounting block (7) which is overlapped with the axis of the annular filter plate (6) is fixedly arranged on the inner circumferential surface of the annular filter plate;

the upper surface of the mounting block (7) is rotatably provided with a rotating shaft (8) which is coincident with the axis of the mounting block, and the surface of the rotating shaft (8) is provided with a material pressing mechanism (9) through a thread groove; the pressing mechanism (9) comprises a pressing disc (91) in threaded fit with the rotating shaft (8); a vertical groove (10) is formed in the inner wall of the mounting cylinder (3), and a sliding block (92) which is in sliding fit with the vertical groove (10) is fixedly arranged on the pressure plate (91);

a mounting disc (11) which is overlapped with the axis of the mounting disc is fixedly mounted below the pressure disc (91) on the rotating shaft (8), a plurality of connecting arms (12) are uniformly and fixedly mounted on the outer circumferential surface of the mounting disc (11) along the circumferential direction of the mounting disc, and a scraping mechanism (13) is fixedly mounted at the end part of each connecting arm (12); the scraping mechanism (13) comprises a strip-shaped block (131) fixedly connected to the end part of the connecting arm (12) and arranged along the length direction of the connecting arm (12); the bottom surface of the strip-shaped block (131) is vertically and fixedly provided with a front baffle (132) and a rear baffle (133) which are parallel to each other; an end plate (134) fixedly connected with the end surfaces of the front baffle (132) and the rear baffle (133) is vertically and fixedly arranged on the bottom surface of the strip-shaped block (131); the surface of the rear baffle plate (133) facing the front baffle plate (132) is provided with a scraping plate (135); the end face of the scraping plate (135) is matched with the surface of the end plate (134); the surface of the scraping plate (135) facing the front baffle (132) is inclined, and the bottom surface of the front baffle (132) is matched with the surface of the scraping plate (135) facing the front baffle (132);

the top of the rotating shaft (8) penetrates through the cover plate (4) and is horizontally and fixedly provided with a first conical fluted disc (14), the upper surface of the cover plate (4) is horizontally and fixedly provided with a driving motor (15), and the end part of an output shaft of the driving motor (15) is fixedly provided with a first incomplete conical fluted disc (16) which is meshed with the first conical fluted disc (14); a material taking mechanism (17) corresponding to the scraping mechanism (13) is arranged on the side wall of the mounting cylinder (3); a water inlet (18) is formed in the side wall of the mounting cylinder (3) in a penetrating manner, and a sealing plug (19) is arranged at the water inlet (18);

the material taking mechanism (17) comprises a material taking opening (171) horizontally penetrating through the side wall of the mounting cylinder (3), and a horizontal rod (172) is arranged in the material taking opening (171); a brush roller (173) is fixedly arranged on the end surface of the horizontal rod (172) facing the inner side of the mounting cylinder (3), and a sealing sheet (174) matched with the material taking opening (171) is fixedly arranged at the end part of the brush roller (173); the first magnet block (136) is embedded on the bottom surface of the scraping plate (135), and the second magnet block (23) is fixedly arranged on the upper surface of the mounting ring (5) at a position corresponding to the first magnet block (136);

a water inlet groove (175) which is positioned above the material taking opening (171) and communicated with the material taking opening (171) is formed in the mounting cylinder (3), and a water outlet groove (176) which is positioned below the material taking opening (171) and communicated with the material taking opening (171) is formed in the mounting cylinder (3); water pipes are fixedly arranged at the ports of the water inlet tank (175) and the water outlet tank (176); an annular water receiving tank (177) is fixedly arranged below the water outlet tank (176) on the outer wall of the mounting cylinder (3);

the surface of the horizontal rod (172) is provided with a spiral groove, and the horizontal rod (172) is matched with the material taking opening (171) through the spiral groove; a gear rod (178) which is coincident with the axis of the horizontal rod (172) is fixedly arranged on the end surface of the horizontal rod far away from the inner side of the installation cylinder (3); a first horizontal shaft (179) is rotatably arranged on the outer wall of the mounting cylinder (3) at a position corresponding to the gear rod (178), and a gear disc (1710) meshed with the gear rod (178) is fixedly arranged on the first horizontal shaft (179); an elastic rope (1711) in a tensioning state is fixedly connected between the end face of the gear disc (1710) and the outer wall of the mounting cylinder (3); a first bobbin (1712) is fixedly mounted on the first horizontal shaft (179);

the driving motor (15) is a double-shaft motor, and a second incomplete conical fluted disc (24) is fixedly arranged at the end part of an output shaft of the driving motor (15); a vertical shaft (25) is rotatably arranged on the top surface of the mounting cylinder (3) corresponding to the position of the second incomplete conical fluted disc (24), and a second conical fluted disc (26) which is meshed with the second incomplete conical fluted disc (24) is fixedly arranged on the vertical shaft (25); a second horizontal shaft (27) is rotatably arranged on the outer wall of the mounting cylinder (3) at a position corresponding to the second conical fluted disc (26) through a bracket, and a third conical fluted disc (28) meshed with the second conical fluted disc (26) is fixedly arranged at one end of the second horizontal shaft (27); a second bobbin (29) corresponding to the first bobbin (1712) is fixedly arranged at the other end of the second horizontal shaft (27); a pull wire (30) is connected between the first bobbin (1712) and the second bobbin (29).

2. The method for treating industrial wastewater containing hazardous metal ions according to claim 1, wherein the method comprises the steps of: a supporting rod (20) is fixedly arranged between the inner circumferential surface of the mounting ring (5) and the outer circumferential surface of the mounting block (7).

3. The method for treating industrial wastewater containing hazardous metal ions according to claim 1, wherein the method comprises the steps of: a plurality of vertical internal thread sleeves (93) are uniformly and rotatably arranged on the lower surface of the pressure plate (91) along the circumferential direction of the pressure plate; the outer surface of the internal thread sleeve (93) is uniformly and fixedly provided with a plurality of horizontal stirring plates (94) along the circumferential direction; the lower surface of the cover plate (4) is vertically and fixedly provided with an external threaded rod (21) which is matched with the internal threaded sleeve (93) at the position corresponding to the internal threaded sleeve (93).

4. The method for treating industrial wastewater containing hazardous metal ions according to claim 1, wherein the method comprises the steps of: the upper surface of the round bottom plate (1) is fixedly provided with a guide disc (22), and the upper surface of the guide disc (22) is a conical surface.