CN114590928B

CN114590928B - Method and device for treating nickel-containing wastewater

Info

Publication number: CN114590928B
Application number: CN202210282750.7A
Authority: CN
Inventors: 徐忠厂; 张鑫; 刘海龙; 陈根良; 陈聪杰
Original assignee: Suzhou Senrong Environmental Disposal Co ltd
Current assignee: Suzhou Senrong Environmental Disposal Co ltd
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2023-04-07
Anticipated expiration: 2042-03-22
Also published as: CN114590928A

Abstract

The invention discloses a method and a device for treating nickel-containing wastewater, wherein the nickel-containing wastewater is introduced into a primary sedimentation device, the nickel-containing wastewater in the primary sedimentation device realizes solid-liquid separation at the upper end edge of a guide plate through a guide hole, and the upper clear liquid is introduced into a reaction device through a liquid extraction device; adjusting the pH value to 3-3.5 in a reaction device, then adding a heavy metal trapping agent, and controlling to carry out layering and integral stirring; introducing the stirred wastewater into a coagulation device, adjusting the pH value to 6.5-9.5, adding a coagulant, introducing sludge in the primary sedimentation device into the coagulation device by a first sludge pump, and starting stirring; introducing the wastewater into a flocculation device, adding a flocculating agent, starting stirring, setting the stirring speed at the maximum stirring speed, and gradually controlling the stirring speed to reduce until the stirring is stopped; introducing the wastewater after the flocculation treatment into a precipitation device for precipitation; and finally discharging clear liquid and collecting sludge. The invention has the following technical effects: the nickel removing effect of the nickel-containing wastewater is improved.

Description

Method and device for treating nickel-containing wastewater

Technical Field

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method and a device for treating nickel-containing wastewater.

Background

The nickel-containing wastewater in the electroplating industry refers to cleaning water generated in nickel electroplating, waste liquid discharged after pretreatment of high-concentration nickel waste liquid, comprehensive wastewater of an electroplating plant and the like. The electroplating wastewater has complex water quality components and contains a large amount of heavy metal ions and organic pollutants, particularly chemical nickel plating wastewater, and the wastewater contains a large amount of complexing agents which coexist with metal ions such as nickel, copper and the like, such as citric acid, tartaric acid, sodium hypophosphite and the like, so that the heavy metal ions are difficult to effectively remove through coagulating sedimentation and can be removed only after the complexing is broken. The traditional complex breaking process mainly comprises a chemical oxidation complex breaking process, an electrochemical oxidation complex breaking process and the like, wherein the chemical oxidation complex breaking process mainly uses oxidants such as ozone, sodium hypochlorite, fenton reagent and the like, and because the components of the chemical nickel plating wastewater are complex, the chemical nickel plating wastewater has a good removal effect, the oxidant adding amount is large, and the treatment cost is high. The stability of the electrochemical oxidation complex breaking effect is poor, and the nickel-containing wastewater is difficult to be treated in a large scale.

The treatment method of nickel-containing wastewater mainly comprises a chemical precipitation method, an adsorption method and an ion exchange method. Although the methods are more, the current methods are limited to the existing equipment and cannot achieve satisfactory effects.

Disclosure of Invention

In view of the above technical problems, the present invention provides a method and apparatus for treating nickel-containing wastewater, which aims to solve the problems in the prior art.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a method for treating nickel-containing wastewater is characterized in that nickel-containing wastewater is introduced into a primary sedimentation device 1, solid-liquid separation is realized on the upper end edge of a guide plate 17 by the nickel-containing wastewater in the primary sedimentation device 1 through a guide hole 21, and the upper clear liquid is introduced into a reaction device 4 through a liquid extraction device 15; adjusting the pH value to 3-3.5 in a reaction device 4, then adding a heavy metal trapping agent, and controlling to carry out layering and integral stirring; introducing the stirred wastewater into a coagulation device 5, adjusting the pH value to 6.5-9.5, adding a coagulant, introducing the sludge in the primary sedimentation device 1 into the coagulation device 5 by a first sludge pump 25, and starting stirring; introducing the wastewater into a flocculation device 9, adding a flocculant, starting stirring, setting the stirring speed at the maximum stirring speed, and gradually controlling the stirring speed to be reduced until the stirring is stopped; introducing the wastewater after flocculation treatment into a precipitation device 13 for precipitation; and finally discharging clear liquid and collecting sludge.

Further, pH value is adjusted by adopting acid and alkali substances, polyaluminium chloride is selected as a coagulant, and polyacrylamide is selected as a flocculant.

Further, in the primary sedimentation device 1, the guide wheel fan 24 is controlled to introduce nickel-containing wastewater in the upper region 18 into the middle region 19, the nickel-containing wastewater flows upwards along the guide plate 17 under the action of the arc-shaped guide plate 17, sludge falls into the lower region 20 through the sedimentation holes 23 under the action of gravity, and the rest nickel-containing wastewater enters the upper region 18 through the one-way valve and then is introduced into the reaction device 4 through the liquid pumping device 15.

Furthermore, the position of the moving platform is controlled by the lifting motor 34 in the reaction device 4, so that fixed-point and integral stirring is realized, and the reaction of the liquid medicine and the nickel-containing wastewater is promoted.

A device for treating nickel-containing wastewater comprises a primary sedimentation device 1, a reaction device 4, a coagulation device 5, a flocculation device 9 and a sedimentation device 13, wherein the primary sedimentation device 1 is supported on the ground through a first support frame 2, a plurality of feed inlets 3 are formed in the upper portion of the primary sedimentation device 1 (the feed inlets 3 feed wastewater to positions close to a separation plate 16), the wastewater after primary sedimentation of the primary sedimentation device 1 is fed into the reaction device 4 through a liquid pumping device 15, the sludge after primary sedimentation of the primary sedimentation device 1 is fed into the coagulation device 5 through a first sludge pump 25, and the reaction device 4 is a heavy metal trapping agent reaction tank; after being treated in the reaction device 4, the wastewater is introduced into a coagulation device 5 through a first water pump 39, the coagulation device 5 is supported on the ground through a second support frame 6, and a first stirring device 7 and a first dosing port 8 are arranged on the coagulation device 5; the mixed liquid is introduced into a flocculation device 9 through a coagulation device 5 and a second water pump 40, the flocculation device 9 is supported on the ground through a third support frame 10, and a second stirring device 11 and a second medicine adding opening 12 are arranged on the flocculation device 9; finally enters the sedimentation device 13 through a second sludge pump 41 for sedimentation treatment, the generated clear liquid is discharged through a water discharge pipe 50, and the generated sludge is discharged through a sludge pipe 51 to be treated later (the filter press is made into a sludge cake).

Further, the primary sedimentation device 1 has a housing 14, a partition plate 16 is disposed inside the housing 14 and below the liquid pumping device 15, a flow guide plate 17 is disposed below the partition plate 16, the partition plate 16 and the flow guide plate 17 divide the interior of the housing 14 into an upper region 18, a middle region 19, and a lower region 20 from top to bottom, the partition plate 16 is of a concave structure, a flow guide hole 21 is formed in the bottom of the partition plate 16, a flow guide wheel fan 24 is disposed at the flow guide hole 21, the flow guide wheel fan 24 guides wastewater in the upper region 18 into the middle region 19, the edge of the partition plate 16 is fixed on the inner wall of the housing 14, a liquid change hole 22 is formed at the edge (near the edge), the flow guide plate 17 is also of a concave structure, the flow guide plate 17 has a downward bent edge, the edge of the flow guide plate 17 is fixed on the inner wall of the housing 14, a sedimentation hole 23 is formed at the bent edge, a one-way valve is disposed at the sedimentation hole 23, and the lower end of the feed port 3 is located above the partition plate 16 (or close to the partition plate 16).

Further, an opening 26 is formed in the upper portion of the shell 14, the liquid pumping device 15 comprises supporting blocks 27 arranged on the left side and the right side of the opening 26, a threaded rod 28 is supported on the supporting blocks 27, the threaded rod 28 is connected with a driving shaft of a telescopic motor 29, the threaded directions of the left side and the right side of the threaded rod 28 are opposite, sliding blocks 30 are sleeved on the left side and the right side of the threaded rod 28, the sliding blocks 30 are supported on sliding rails (not shown in the figures of the sliding rails, the sliding blocks 30 can move on the sliding rails and can be controlled to move left and right in the horizontal direction), the sliding blocks 30 are hinged to a scissor type telescopic rod 31, a submersible pump 32 is fixed at the lower end of the scissor type telescopic rod 31, the submersible pump 32 is connected with a telescopic conveying pipe 33, the conveying pipe 33 is connected with the upper portion of the reaction device 4, and the bottom of the primary sedimentation device 1 is connected with a first sludge pump 25.

Furtherly reaction unit 4's upper end both sides are provided with elevator motor 34, elevator motor 34 is fixed with moving platform 36 through connecting rope 35, be provided with stirring rake 37 on the moving platform 36, stirring rake 37 is through waterproof motor 38 drive, be provided with charge device on the moving platform 36, charge device is used for adding the heavy metal trapping agent in to reaction unit, (can realize the fixed point and stir repeatedly).

Further first medicine mouth 8 is used for adding the coagulant, second medicine mouth 12 is used for adding the flocculating agent, first agitating unit 7 with 11 structures of second agitating unit are the same, all have the puddler 42 of being connected with driving motor, fix the backup pad 43 of puddler 42 lower extreme, be connected with stirring vane 44 on the backup pad 43, stirring vane 44 has the vertical section on upper portion and the bending section of lower part, the lower extreme of bending section with the backup pad 43 is fixed, stirring vane 44's inboard sets up and is symmetrical convex inclined plane 45.

Furthermore, a plurality of hemispherical shells 47 are supported in the sedimentation device 13 through a support rod 46, the hemispherical shells 47 are sequentially nested, a sedimentation region 48 is formed below the support rod 46, a plurality of through holes 49 are formed in the hemispherical shells 47, a first region 52 and a second region 53 are set on the hemispherical shells 47 by taking the vertex as the center of a circle, the first region 52 is contained in the second region 53, the density of the through holes in the first region 52 is smaller than that of the through holes in the second region 53 (the sedimentation in different regions is realized, the sedimentation speed is different due to different gradients on each small plane of the hemispherical shells, the different densities of the through holes are set to adapt to different sedimentation speeds, the sedimentation in multiple shells is realized, sludge particles with different sizes can be sedimented, the purpose of further sedimentation is realized, and the prior art does not consider the need of graded sedimentation or the inconvenience of graded sedimentation).

The invention has the following technical effects:

1. the primary sedimentation device of the invention is provided with a separation plate and a guide plate, and is divided into three layers: the partition plate and the guide plate are arranged in the inner concave structures in the upper area, the middle area and the lower area, so that the nickel-containing wastewater can be automatically and primarily precipitated, and the precipitation effect on fine particles is good; the preliminarily precipitated substances are collected for subsequent backflow precipitation, and the coagulation effect is improved.

2. The liquid pumping device is arranged in a telescopic manner, the uppermost clear liquid in the primary sedimentation device can be controlled to be pumped all the time, the lower part of the primary sedimentation device can be continuously subjected to circulating primary sedimentation, primary sediments can be fully collected, the use of a coagulant after the use is reduced, and the coagulation effect can be improved.

3. The stirring device in the reaction device is arranged to be capable of moving up and down, can stir the whole body, can stir at a fixed point or a fixed layer, can better react the added heavy metal trapping agent with the nickel-containing wastewater, meets the requirement of the reaction in a fixed-point stirring manner, and can reduce the using amount of the heavy metal trapping agent while providing the reaction effect.

4. The first stirring device and the second stirring device have the same structure, and are respectively provided with a stirring rod connected with a driving motor, a supporting plate fixed at the lower end of the stirring rod, the supporting plate is connected with a stirring blade, the stirring blade is provided with an upper vertical section and a lower bending section, the lower end of the bending section is fixed with the supporting plate, and the inner side of the stirring blade 44 is provided with a symmetrical arc inclined plane which can always polymerize wastewater to the inside to form an impact effect and has a better mixing effect at the beginning stage of coagulation and flocculation; the speed of agitation is then reduced to reduce the effect on the already formed flocs while maintaining enhanced mixing.

5. The sedimentation device provided by the invention has the advantages that the sedimentation is carried out in different areas, the sedimentation speed is different due to different gradients on each facet of the hemispherical shell, and different densities of the through holes are set to adapt to different sedimentation speeds; the sludge sedimentation tank is divided into a plurality of shell sediments, sludge particles with different sizes can be sedimentated, the purpose of further sedimentation is achieved, and the need of fractional sedimentation or the inconvenience of fractional sedimentation is not considered in the prior art.

Drawings

FIG. 1 is a schematic view of the overall structure of a nickel-containing wastewater treatment apparatus according to the present invention;

FIG. 2 is a schematic view of the internal structure of the primary settling device of the present invention;

FIG. 3 is a schematic view of the structure of part A of FIG. 2 according to the present invention;

FIG. 4 is a schematic view of a through hole of portion B of FIG. 2 according to the present invention;

FIG. 5 is a schematic view of the invention in the extended state of the pump of FIG. 2;

FIG. 6 is a schematic view showing the internal structure of a reaction apparatus according to the present invention;

FIG. 7 is a schematic view of the internal structure of a reaction apparatus according to the present invention (a sectional view of a stirring apparatus);

FIG. 8 is a schematic view of the invention in the operating state of FIG. 6;

FIG. 9 is a schematic diagram of the internal structure of the coagulation apparatus and flocculation apparatus of the present invention;

FIG. 10 is a schematic view of an agitator of the present invention;

FIG. 11 is a top plan view of the mixer of the present invention;

FIG. 12 is a schematic view of the internal structure of the precipitation apparatus of the present invention;

FIG. 13 is a top view of the precipitation device of the present invention;

in the figure, a primary sedimentation device 1, a first support frame 2, a feed inlet 3, a reaction device 4, a coagulation device 5, a second support frame 6, a first stirring device 7, a first dosing port 8, a flocculation device 9, a third support frame 10, a second stirring device 11, a second dosing port 12, a sedimentation device 13, a shell 14, a liquid pumping device 15, a partition plate 16, a guide plate 17, an upper region 18, a middle region 19, a lower region 20, a guide hole 21, a liquid changing hole 22, a sedimentation hole 23, a guide wheel fan 24, a first sludge pump 25, an opening 26, a support block 27, a threaded rod 28, a telescopic motor 29, a sliding block 30, a fork type telescopic rod 31, a submersible pump 32, a conveying pipe 33, a lifting motor 34, a connecting rope 35, a moving platform 36, a stirring paddle 37, a waterproof motor 38, a first water pump 39, a second water pump 40, a second water pump 41, a stirring rod 42, a support plate 43, a stirring blade 44, a stirring blade 45, a support rod 46, a hemispherical shell 47, a sedimentation zone 48, a through hole 49, a sludge pipe 50, a sludge pipe 51, a first drainage pipe 52 and a second region 53.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected or detachably connected; may be a mechanical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

The invention discloses a method and a device for treating nickel-containing wastewater, and as shown in figure 1, the device for treating nickel-containing wastewater in the invention is shown, and comprises a primary sedimentation device 1, a reaction device 4, a coagulation device 5, a flocculation device 9 and a sedimentation device 13.

The primary sedimentation device 1 is arranged in a sphere structure, as shown in fig. 1, the primary sedimentation device 1 is supported on the ground through a first support frame 2, a plurality of feed inlets 3 are arranged above the primary sedimentation device 1, and the feed inlets 3 introduce waste water to a position close to the isolation plate 16 or a position near the isolation plate 16.

As shown in fig. 2, 4, and 5, the primary sedimentation device 1 includes a housing 14, a partition 16 is disposed inside the housing 14 and below the liquid pumping device 15, a guide plate 17 is disposed below the partition 16, the partition 16 and the guide plate 17 divide the interior of the housing 14 into an upper region 18, a middle region 19, and a lower region 20 from top to bottom, the partition 16 is of a concave structure, a guide hole 21 is formed at the bottom of the partition 16, a guide wheel fan 24 is disposed at the guide hole 21, the guide wheel fan 24 guides the wastewater in the upper region 18 into the middle region 19, the edge of the partition 16 is fixed on the inner wall of the housing 14, a liquid changing hole 22 is formed at the edge (near the edge), the guide plate 17 is also of a structure, the guide plate 17 has a concave downward-bent edge, the edge of the guide plate 17 is fixed on the inner wall of the housing 14, a sedimentation hole 23 is formed at the bent edge, a sedimentation check valve is disposed at the sedimentation hole 23, and the lower end of the feed port 3 is located above the partition 16 or near the partition 16.

As shown in fig. 3, an opening 26 is opened above the shell 14, the liquid pumping device 15 includes support blocks 27 disposed on the left and right sides of the opening 26, a threaded rod 28 is supported on the support blocks 27, the threaded rod 28 is connected with a drive shaft of a telescopic motor 29, the threaded directions of the left and right sides of the threaded rod 28 are opposite, sliding blocks 30 are sleeved on the left and right sides of the threaded rod 28, the sliding blocks 30 are supported on slide rails (not shown in the figure of the slide rails, which is used for moving the sliding blocks 30 on the slide rails and controlling the sliding blocks 30 to move left and right in the horizontal direction), the sliding blocks 30 are hinged with a scissor-type telescopic rod 31, a submersible pump 32 is fixed on the lower end of the scissor-type telescopic rod 31, the submersible pump 32 is connected with a telescopic conveying pipe 33, the conveying pipe 33 is connected with the upper portion of the reaction device 4, and the bottom of the primary sedimentation device 1 is connected with a first sludge pump 25. The wastewater after primary sedimentation of the primary sedimentation device 1 is introduced into the reaction device 4 through the liquid extraction device 15, and the sludge after primary sedimentation of the primary sedimentation device 1 is introduced into the coagulation device 5 through the first sludge pump 25.

Referring to FIGS. 6 and 7, the reactor 4 of the present invention is shown, and FIG. 8 shows the operation of the reactor 4 of the present invention. Reaction unit 4 is heavy metal entrapment agent reaction tank, reaction unit 4's upper end both sides are provided with elevator motor 34, elevator motor 34 is fixed with moving platform 36 through connecting rope 35, be provided with stirring rake 37 on the moving platform 36, stirring rake 37 is through waterproof motor 38 drive, be provided with charge device on the moving platform 36, charge device is used for adding the heavy metal entrapment agent in the reaction unit, (can realize the fixed point and stir repeatedly), lets in through first water pump 39 in the coagulation unit 5 after the processing in reaction unit 4.

As shown in fig. 9, the coagulation device 5 is supported on the ground by a second support frame 6, and a first stirring device 7 and a first dosing port 8 are arranged on the coagulation device 5; the coagulation device 5 is led into the flocculation device 9 through the second water pump 40, the flocculation device 9 is supported on the ground through the third support frame 10, and the flocculation device 9 is provided with a second stirring device 11 and a second dosing port 12. The first dosing port 8 is used for adding a coagulant, and the second dosing port 12 is used for adding a flocculant.

As shown in fig. 10 and 11, the first stirring device 7 and the second stirring device 11 have the same structure, and each of the first stirring device 7 and the second stirring device 11 has a stirring rod 42 connected to a driving motor, a supporting plate 43 fixed to a lower end of the stirring rod 42, a stirring blade 44 connected to the supporting plate 43, the stirring blade 44 having an upper vertical section and a lower curved section, a lower end of the curved section being fixed to the supporting plate 43, and a symmetrical circular arc inclined surface 45 being provided on an inner side of the stirring blade 44.

As shown in fig. 1, the sludge is finally introduced into the settling device 13 by the second sludge pump 41 for settling treatment, the resulting clear liquid is discharged through the water discharge pipe 50, and the resulting sludge is discharged through the sludge pipe 51 for subsequent treatment (filter press forming into a cake).

As shown in fig. 12 and 13, a plurality of hemispherical shells 47 are supported in the sedimentation device 13 through a support rod 46, the hemispherical shells 47 are sequentially nested, a sedimentation region 48 is formed below the support rod 46, a plurality of through holes 49 are formed in the hemispherical shells 47, a first region 52 and a second region 53 are set on the hemispherical shells 47 with a vertex as a center, the first region 52 is included in the second region 53, and the density of the through holes in the first region 52 is less than that of the through holes in the second region 53. The sedimentation is carried out in different areas, because the inclination of each small plane of the hemispherical shell is different, the sedimentation speed is different, and the different densities of the through holes are set to adapt to different sedimentation speeds; the sludge sedimentation tank is divided into a plurality of shell sediments, sludge particles with different sizes can be sedimentated, the purpose of further sedimentation is achieved, and the need of fractional sedimentation or the inconvenience of fractional sedimentation is not considered in the prior art.

Based on the device, the invention also discloses a method for treating nickel-containing wastewater, nickel-containing wastewater is introduced into the primary sedimentation device 1, solid-liquid separation is realized on the upper end edge of the guide plate 17 by the nickel-containing wastewater in the primary sedimentation device 1 through the guide holes 21, and the upper clear liquid is introduced into the reaction device 4 through the liquid extraction device 15; adjusting the pH value to 3-3.5 in a reaction device 4, then adding a heavy metal trapping agent, and controlling to carry out layering and integral stirring; introducing the stirred wastewater into a coagulation device 5, adjusting the pH value to 6.5-9.5, adding a coagulant, introducing the sludge in the primary sedimentation device 1 into the coagulation device 5 by a first sludge pump 25, and starting stirring; introducing the wastewater into a flocculation device 9, adding a flocculating agent, starting stirring, setting the stirring speed at the maximum stirring speed, and gradually controlling the stirring speed to reduce until the stirring is stopped; introducing the wastewater after flocculation treatment into a precipitation device 13 for precipitation; and finally discharging clear liquid and collecting sludge. In the primary sedimentation device 1, the guide wheel fan 24 is controlled to lead nickel-containing wastewater in the upper region 18 into the middle region 19, the nickel-containing wastewater flows upwards along the guide plate 17 under the action of the arc-shaped guide plate 17, sludge falls into the lower region 20 through the sedimentation hole 23 under the action of gravity, and the rest nickel-containing wastewater enters the upper region 18 through the one-way valve and then is led into the reaction device 4 through the liquid pumping device 15. In the reaction device 4, the position of the moving platform is controlled by the lifting motor 34, fixed-point and integral stirring is realized, and the reaction of the liquid medicine and the nickel-containing wastewater is promoted. pH value is adjusted by adopting acid and alkali substances (which is a conventional means in the field and can be obtained by adopting the prior art), polyaluminium chloride is selected as a coagulant, and polyacrylamide is selected as a flocculant.

The invention has the following technical effects:

1. the primary sedimentation device of the invention is provided with a separation plate and a guide plate, and is divided into three layers: the partition plate and the guide plate are arranged in the inner concave structures in the upper area, the middle area and the lower area, so that the nickel-containing wastewater can be automatically and primarily precipitated, and the precipitation effect on fine particles is good; the preliminarily precipitated substances are collected for subsequent reflux precipitation, so that the coagulation effect is improved.

3. The stirring device in the reaction device is arranged to be capable of moving up and down, can stir the whole body, can stir at a fixed point or a fixed layer, can better react the added heavy metal trapping agent with the nickel-containing wastewater, meets the requirement of the reaction in a fixed-point stirring mode, and can reduce the using amount of the heavy metal trapping agent while providing the reaction effect.

5. The sedimentation device of the invention sediments by regions, because the inclination on each facet of the hemispherical shell is different, the sedimentation speed is different, and the different densities of the through holes are set to adapt to different sedimentation speeds; the sludge sedimentation tank is divided into a plurality of shell sediments, sludge particles with different sizes can be sedimentated, the purpose of further sedimentation is achieved, and the need of fractional sedimentation or the inconvenience of fractional sedimentation is not considered in the prior art.

6. Through above-mentioned device, nickel removal effect of nickeliferous waste water has been improved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent substitutions and improvements to part of the technical features of the foregoing embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An apparatus for treating nickel-containing wastewater, characterized in that: the device comprises a primary sedimentation device (1), a reaction device (4), a coagulation device (5), a flocculation device (9) and a sedimentation device (13), wherein the primary sedimentation device (1) is supported on the ground through a first support frame (2), a feed inlet (3) is formed above the primary sedimentation device (1), wastewater after primary sedimentation of the primary sedimentation device (1) is introduced into the reaction device (4) through a liquid pumping device (15), sludge after primary sedimentation of the primary sedimentation device (1) is introduced into the coagulation device (5) through a first sludge pump (25), and the reaction device (4) is a heavy metal trapping agent reaction tank; after being processed in the reaction device (4), the raw materials are introduced into a coagulation device (5) through a first water pump (39), the coagulation device (5) is supported on the ground through a second support frame (6), and a first stirring device (7) and a first medicine adding opening (8) are arranged on the coagulation device (5); the mixed liquor is introduced into a flocculation device (9) through a coagulation device (5) and a second water pump (40), the flocculation device (9) is supported on the ground through a third support frame (10), and a second stirring device (11) and a second dosing port (12) are arranged on the flocculation device (9); finally, the sewage enters a sedimentation device (13) through a second sludge pump (41) for sedimentation treatment, the generated clear liquid is discharged through a drain pipe (50), and the generated sludge is discharged through a sludge pipe (51) for subsequent treatment;

the primary sedimentation device (1) is provided with a shell (14), a separation plate (16) is arranged in the shell (14) and below the liquid pumping device (15), a guide plate (17) is arranged below the separation plate (16), the separation plate (16) and the guide plate (17) divide the interior of the shell (14) into an upper area (18), a middle area (19) and a lower area (20) from top to bottom, the separation plate (16) is of a concave structure, a guide hole (21) is formed in the bottom of the separation plate (16), a guide wheel fan (24) is arranged at the guide hole (21), the guide wheel fan (24) guides waste water in the upper area (18) into the middle area (19), the edge of the separation plate (16) is fixed on the inner wall of the shell (14), a liquid changing hole (22) is formed in the edge, the guide plate (17) is also of a concave structure, the guide plate (17) is provided with a downward bent edge, the edge of the guide plate (17) is fixed on the inner wall of the shell (14), a sedimentation hole (23) is formed in the lower end of the separation plate (23), and a sedimentation valve (23) is arranged at the lower end of the separation plate (3);

the device comprises a reaction device (4) and is characterized in that lifting motors (34) are arranged on two sides of the upper end of the reaction device (4), a moving platform (36) is fixed on the lifting motors (34) through connecting ropes (35), a stirring paddle (37) is arranged on the moving platform (36), the stirring paddle (37) is driven by a waterproof motor (38), and a dosing device is arranged on the moving platform (36) and used for adding a heavy metal trapping agent into the reaction device;

a plurality of hemispherical shells (47) are supported in the sedimentation device (13) through a support rod (46), the hemispherical shells (47) are sequentially nested, a sedimentation area (48) is formed below the support rod (46), a plurality of through holes (49) are formed in each hemispherical shell (47), a first area (52) and a second area (53) are set on each hemispherical shell (47) by taking a vertex as a circle center, each first area (52) is contained in each second area (53), and the density of the through holes in each first area (52) is smaller than that of the through holes in each second area (53).

2. An apparatus for treating nickel-containing wastewater according to claim 1, characterized in that: opening (26) have been seted up to the top of casing (14), draw liquid device (15) including setting up supporting shoe (27) on opening (26) left and right sides, threaded rod (28) support on supporting shoe (27), threaded rod (28) and the drive shaft connection of flexible motor (29), the screw thread opposite direction of the left and right sides of threaded rod (28) all overlap and be equipped with sliding block (30) about threaded rod (28), sliding block (30) support on the slide rail, sliding block (30) are articulated with scissors fork telescopic link (31), the lower extreme of scissors fork telescopic link (31) is fixed with immersible pump (32), immersible pump (32) are connected with telescopic conveyer pipe (33), conveyer pipe (33) with the upper portion of reaction unit (4) is connected, first sludge pump (25) is connected to the bottom of preliminary sedimentation device (1).

3. An apparatus for treating nickel-containing wastewater according to claim 2, characterized in that: first medicine mouth (8) are used for adding the coagulant, second medicine mouth (12) are used for adding the flocculating agent, first agitating unit (7) with second agitating unit (11) structure is the same, all has puddler (42) of being connected with driving motor, fixes backup pad (43) of puddler (42) lower extreme, be connected with stirring vane (44) on backup pad (43), stirring vane (44) have the vertical section on upper portion and the bending section of lower part, the lower extreme of bending section with backup pad (43) are fixed, the inboard setting of stirring vane (44) is convex inclined plane (45) of symmetry.