CN114349232B - High-concentration electroplating wastewater adsorption treatment tank and use method thereof - Google Patents
High-concentration electroplating wastewater adsorption treatment tank and use method thereof Download PDFInfo
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Abstract
A high-concentration electroplating wastewater adsorption treatment tank and a use method thereof relate to an electroplating wastewater adsorption treatment tank and a use method thereof. Solves the problems that the treatment period of the prior adsorption method for treating the high-concentration degradation-resistant waste liquid is long, the adsorption efficiency is low, and the nickel concentration of the treated water in a short time is difficult to reach below 0.1 mg/L. The treatment tank comprises a first electroplating wastewater treatment tank body, a stirrer, a second electroplating wastewater treatment tank body and a micro-electric field fiber adsorbent. The method comprises the following steps: introducing nickel-containing electroplating wastewater into a first electroplating wastewater treatment tank body, adding an adsorbent and aerating, rotating a stirring paddle, blowing gas into a gas outlet, opening a water outlet valve of the first electroplating wastewater treatment tank body, introducing the treated electroplating wastewater into a second electroplating wastewater treatment tank body, aerating, applying voltage to a plate electrode, and circularly pumping the wastewater into the second electroplating wastewater treatment tank body through a circulating water pump. The invention relates to a high-concentration electroplating wastewater adsorption treatment tank and a using method thereof.
Description
Technical Field
The invention relates to an electroplating wastewater adsorption treatment tank and a using method thereof.
Background
Electroplating is a process for decorating and protecting metal and non-metal surfaces and obtaining certain new properties by using an electrochemical method. The nickel-containing electroplating wastewater mainly comes from plating bath waste liquid and plating piece rinsing water in the nickel plating production process, and the plating bath waste liquid is small in amount but the concentration content of nickel ions in the plating bath waste liquid is very high. Such waste streams are discarded due to the end of the service life of the bath or due to certain technical parameters no longer meeting the requirements of use, and generally contain very high concentrations of nickel ions. However, according to the discharge Standard of electroplating pollutants (GB 21900-2008), the mass concentration of total nickel in electroplating wastewater discharged into a water body is allowed to be 0.5mg/L at most.
The adsorption method is a high-efficiency traditional removal method, and common adsorbents comprise: the activated carbon (powder and particles, various materials, carbon nano tubes, zeolite, bentonite, vermiculite, chitosan, a plurality of cheap and easily-obtained adsorbents and the like) has long treatment period on high-concentration refractory waste liquid and low adsorption efficiency, and the concentration of nickel in treated water in a short time is difficult to reach below 0.1mg/L, so that the wide popularization and application of the activated carbon in practical engineering are limited.
Disclosure of Invention
The invention provides a device for removing high-concentration nickel-containing wastewater and a using method thereof, aiming at solving the problems that the treatment period of the existing adsorption method for treating the high-concentration refractory waste liquid is long, the adsorption efficiency is low, and the nickel concentration of the treated water in a short time is difficult to reach below 0.1 mg/L.
A high-concentration electroplating wastewater adsorption treatment tank comprises a first electroplating wastewater treatment tank body, a stirrer, a second electroplating wastewater treatment tank body and a micro-electric field fiber adsorbent;
the upper part of the first electroplating wastewater treatment tank body is provided with a liquid inlet, and the bottom of the first electroplating wastewater treatment tank body is provided with a water outlet; the stirrer is arranged in the first electroplating wastewater treatment tank body and consists of a stirring paddle, a rotating shaft and a motor; one end of the rotating shaft penetrates out of the top of the first electroplating wastewater treatment tank body and is connected with a transmission shaft of the motor; a plurality of stirring paddles are arranged on the rotating shaft; the stirring paddle is an arc-shaped plate, the thickness of the arc-shaped plate is gradually reduced from the rotating shaft to the inner wall of the first electroplating wastewater treatment tank body, and the lower end surface of the arc-shaped plate is inwards sunken to form a notch; the gaps of the adjacent upper stirring paddle and the lower stirring paddle are oppositely arranged; the convex surface of the arc-shaped plate faces the rotating direction of the stirring paddle;
a plurality of first aeration openings are formed in the bottom in the first electroplating wastewater treatment tank body; a plurality of bulges are arranged on the inner side wall of the first electroplating wastewater treatment tank body along the circumferential direction; an adsorbent is added into the first electroplating wastewater treatment tank body;
the first water inlet of the second electroplating wastewater treatment tank body is communicated with the water outlet of the first electroplating wastewater treatment tank body through a pipeline, the water outlet of the second electroplating wastewater treatment tank body is communicated with the water inlet of the circulating water pump through a pipeline, and the water outlet of the circulating water pump is communicated with the second water inlet of the second electroplating wastewater treatment tank body; a micro-electric field fiber adsorbent is arranged in the second electroplating wastewater treatment tank body, and the micro-electric field fiber adsorbent consists of a frame body, two metal conductors, a metal net, an electrode plate and a carbon fiber felt loaded with nickel ferrite; the metal net is wound on the outer surface of the frame body, and the electrode plate consists of a positive electrode plate and a negative electrode plate; the positive electrode plate and the negative electrode plate are respectively positioned on two sides of the frame body, the positive electrode plate and the negative electrode plate are respectively connected with metal conductors positioned on two sides in the frame body, and the outer surface of the metal net is covered with a plurality of layers of carbon fiber felts loaded with nickel ferrite; the cavity enclosed by the frame body and the metal net is filled with an adsorbent.
A use method of a high-concentration electroplating wastewater adsorption treatment tank comprises the following specific steps:
closing a water outlet water valve of the first electroplating wastewater treatment tank body, introducing the electroplating wastewater containing nickel into the first electroplating wastewater treatment tank body, and then adding the adsorbent into the electroplating wastewater treatment tank body according to the mass volume ratio of the adsorbent to the electroplating wastewater of 4-10 g: adding an adsorbent into the electroplating wastewater according to the proportion of 1L, and adjusting the pH value of the electroplating wastewater to 6-8 and the water temperature to 24-26 ℃; starting an aeration device, aerating into the first electroplating wastewater treatment tank body through an aeration port, starting a motor to enable the rotation speed of a stirring paddle to be 200-300 revolutions per minute, blowing gas into the gas through a gas blowing machine through a gas outlet hole at the tail end of the stirring paddle, enabling the electroplating wastewater to stay in the first electroplating wastewater treatment tank body for 0.5-1 hour in a hydraulic manner, then starting a water outlet valve of the first electroplating wastewater treatment tank body, guiding the treated electroplating wastewater into a second electroplating wastewater treatment tank body, starting the aeration device, aerating into the second electroplating wastewater treatment tank body through the aeration port, applying voltage to an electrode plate, circularly pumping the wastewater into the second electroplating wastewater treatment tank body through a circulating water pump, and enabling the hydraulic retention time of the electroplating wastewater in the second electroplating wastewater treatment tank body to be 0.5-1 hour;
the voltage applied by the electrode plate is 1-5 v, and the distance between the anode electrode plate and the cathode electrode plate is 2-7 cm.
The invention has the beneficial effects that:
1. the high-concentration nickel-containing electroplating wastewater is cooperatively treated by the first electroplating wastewater treatment tank body and the second electroplating wastewater treatment tank body, and the discharge standard of electroplating pollutants can be met within 2-4 h.
2. The stirring thick liquid that first electroplating wastewater treatment jar set up is the arc, by the direction thickness of pivot to the internal wall of first electroplating wastewater treatment jar reduce gradually, and the convex surface of arc towards the direction of rotation of stirring thick liquid, and then the convex surface extrusion of arc is around adsorbent and water when the stirring, simultaneously through aeration mode disturbance adsorbent, increases adsorption effect between them, has reduced the process time.
3. The micro electric field generated by the anode electrode plate and the cathode electrode plate in the second electroplating wastewater treatment tank body enables metal ions in the electroplating wastewater to regularly move towards the electrode plates, and when the adsorbent adsorbs the metal ions, the metal ions are collected on the carbon fiber felt loaded with the magnetic nickel ferrite, so that the adsorption rate is improved and the treatment time is shortened under the passing action of the micro electric field, the magnetic substances and the adsorbent.
Drawings
FIG. 1 is a schematic view of a high concentration electroplating wastewater adsorption treatment tank according to the present invention;
FIG. 2 is a schematic structural view of a first electroplating wastewater treatment tank and a stirring paddle according to the present invention;
fig. 3 is a schematic structural diagram of the micro-electric field fiber adsorbent.
Detailed Description
For the purpose of promoting an understanding of the objects, aspects and advantages of the embodiments of the invention, reference will now be made in detail to the embodiments of the invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout the several views.
The exemplary embodiments of the present invention and the description thereof are provided to explain the present invention and not to limit the present invention.
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 3, and a high concentration electroplating wastewater adsorption treatment tank includes a first electroplating wastewater treatment tank 1, a stirrer 2, a second electroplating wastewater treatment tank 5, and a micro-electric field fiber adsorbent 6;
a liquid inlet 11 is arranged at the upper part of the first electroplating wastewater treatment tank body 1, and a water outlet 12 is arranged at the bottom of the first electroplating wastewater treatment tank body 1; the stirrer 2 is arranged in the first electroplating wastewater treatment tank body 1, and the stirrer 2 consists of a stirring paddle 21, a rotating shaft 22 and a motor 23; one end of the rotating shaft 22 penetrates out of the top of the first electroplating wastewater treatment tank body 1 and is connected with a transmission shaft of a motor 23; a plurality of stirring paddles 21 are installed on the rotating shaft 22; the stirring paddle 21 is an arc-shaped plate, the thickness of the arc-shaped plate is gradually reduced from the rotating shaft to the inner wall of the first electroplating wastewater treatment tank body 1, and the lower end surface of the arc-shaped plate is inwards sunken to form a notch 221; the notches 221 of the adjacent upper stirring paddle 21 and the lower stirring paddle 21 are arranged oppositely; the convex surface of the arc-shaped plate faces the rotating direction of the stirring paddle 21;
a plurality of aeration openings I3 are arranged at the bottom in the first electroplating wastewater treatment tank body 1; a plurality of bulges 4 are arranged on the inner side wall of the first electroplating wastewater treatment tank body 1 along the circumferential direction; an adsorbent is added into the first electroplating wastewater treatment tank body 1;
the first water inlet of the second electroplating wastewater treatment tank body 5 is communicated with the water outlet 12 of the first electroplating wastewater treatment tank body 1 through a pipeline, the water outlet of the second electroplating wastewater treatment tank body 5 is communicated with the water inlet of the circulating water pump 8 through a pipeline, and the water outlet of the circulating water pump 8 is communicated with the second water inlet of the second electroplating wastewater treatment tank body 5; a micro-electric field fiber adsorbent 6 is arranged in the second electroplating wastewater treatment tank body 5, and the micro-electric field fiber adsorbent 6 consists of a frame body 61, two metal conductors 64, a metal net 62, an electrode plate and a carbon fiber felt loaded with nickel ferrite; the metal net 62 is wound on the outer surface of the frame body 61, and the electrode plate consists of a positive electrode plate 63 and a negative electrode plate 65; the positive electrode plate 63 and the negative electrode plate 65 are respectively positioned at two sides of the frame body 61, the positive electrode plate 63 and the negative electrode plate 65 are respectively connected with the metal conductors 64 positioned at two sides in the frame body 61, and the outer surface of the metal mesh 62 is covered with a plurality of layers of carbon fiber felts loaded with nickel ferrite; the cavity enclosed by the frame body 61 and the metal mesh 62 is filled with an adsorbent.
The second embodiment is as follows: the present embodiment is different from the specific embodiment in that: the tail end of the stirring paddle 21 is tangent to the inner wall of the first electroplating wastewater treatment tank body 1. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment is different from the first embodiment in that: the tail end of the stirring paddle 21 is provided with an air outlet 212, an air inlet channel is arranged in the rotating shaft 22 and is communicated with an air inlet arranged in the stirring paddle 21, air blown in by the air blower is blown out from the air outlet 212 through the air inlet channel, the air flow is 100-200 mL/min, the air inlet is an intermittent air supply mode, and the air blower blows in air for 1 time when the stirring paddle 21 runs for 2-5 weeks. The rest is the same as the first embodiment.
The fourth concrete implementation mode is as follows: the present embodiment is different from the first embodiment in that: a plurality of aeration openings II 7 are arranged between the water inlet of the second electroplating wastewater treatment tank body 5 and the micro-electric field fiber adsorption body 6. The rest is the same as the first embodiment.
The fifth concrete implementation mode: the present embodiment is different from the specific embodiment in that: and a water outlet is arranged on the pipeline between the water outlet of the second electroplating wastewater treatment tank body 5 and the water inlet of the circulating water pump 8. The rest is the same as the first embodiment.
The sixth specific implementation mode: the present embodiment is different from the first embodiment in that: the adsorbent is prepared from 10-15 parts of active carbon, 5-8 parts of humic acid, 10-20 parts of kaolin, 50-70 parts of FCC spent catalyst, 15-20 parts of ferroferric oxide, 6 parts of alumina, 1-2 parts of carboxymethyl cellulose, 2-7 parts of potassium acetate and 3-8 parts of diatomite. The rest is the same as the first embodiment.
The seventh concrete implementation mode: the present embodiment is different from the specific embodiment in that: the preparation method of the adsorbent comprises the following steps:
(1) Mixing the FCC waste catalyst with nano ferroferric oxide and diatomite, adjusting the pH value to 3.0-6.0, and reacting at 50-70 ℃ for 1-12 hours; then adding humic acid and stirring for 15-20 min to obtain a reactant;
(2) Preparing kaolin into slurry, adding potassium acetate, adjusting the pH value to 9.0-10.0, and reacting at 60-80 ℃ for 2-15 hours to obtain a kaolin reactant;
(3) Mixing activated carbon and alumina, adding carboxymethyl cellulose, uniformly mixing, and drying at the temperature of 100-300 ℃ to obtain the activated carbon material
(4) And (3) uniformly mixing the reactant in the step (1), the kaolin reactant in the step (2) and the activated carbon material in the step (3). The rest is the same as the first embodiment.
The specific implementation mode eight: the present embodiment is different from the specific embodiment in that: the nickel ferrite-loaded carbon fiber felt is prepared by the following steps:
soaking a carbon fiber felt in a phosphoric acid solution with the mass percent of 5-8%, reacting for 4-10 h at the temperature of 70-100 ℃, washing and drying to obtain an acid modified carbon fiber felt, soaking the acid modified carbon fiber felt in a mixture of nickel salt and ferric salt, adding a precipitator, and stirring for 0.5-1 h to obtain a carbon fiber felt loaded with nickel ferrite; the nickel salt is nickel chloride hexahydrate, and the iron salt is ferric chloride hexahydrate; the precipitator is urea; the molar ratio of nickel ions to iron ions in the mixture of the nickel salt and the iron salt is 1; the molar ratio of the precipitant to the nickel salt is 5. Other components and connection modes are the same as those of the first embodiment.
The specific implementation method nine: the present embodiment is different from the first embodiment in that: the carbon fiber felt has a unit mass of 200g/m 2 ～800g/m 2 Carbon fiber ofAnd maintaining the felt, wherein the thickness of the carbon fiber felt is 1 cm-3 cm. The rest is the same as the first embodiment.
The specific implementation mode is ten: the embodiment provides a use method of a high-concentration electroplating wastewater adsorption treatment tank, which comprises the following specific steps:
closing a water outlet water valve of the first electroplating wastewater treatment tank body 1, introducing the electroplating wastewater containing nickel into the first electroplating wastewater treatment tank body 1, and then adding an adsorbent into the electroplating wastewater according to the mass-to-volume ratio of the adsorbent to the electroplating wastewater of 4-10 g: adding an adsorbent in a proportion of 1L, and adjusting the pH value of the electroplating wastewater to 6-8 and the water temperature to 24-26 ℃; starting an aeration device, aerating the first electroplating wastewater treatment tank body 1 through an aeration opening I3, starting a motor 23 to enable the rotation speed of a stirring paddle 21 to be 200-300 r/min, blowing gas from a gas outlet 212 at the tail end of the stirring paddle 21 through a gas blower, enabling the electroplating wastewater to stay in the first electroplating wastewater treatment tank body 1 for 0.5-1 h in hydraulic power, then starting a water outlet valve of the first electroplating wastewater treatment tank body 1, leading the treated electroplating wastewater into a second electroplating wastewater treatment tank body 5, starting the aeration device, aerating the second electroplating wastewater treatment tank body 5 through an aeration opening II 7, applying voltage to an electrode plate, circularly pumping the wastewater into the second electroplating wastewater treatment tank body 5 through a circulating water pump, and enabling the hydraulic power stay time of the electroplating wastewater in the second electroplating wastewater treatment tank body 5 to be 0.5-1 h;
the voltage applied by the electrode plates is 1-5 v, and the distance between the positive electrode plate 63 and the negative electrode plate 65 is 2-7 cm.
The invention is not limited to the above embodiments, and one or a combination of several embodiments may also achieve the object of the invention.
Example 1
A high-concentration electroplating wastewater adsorption treatment tank comprises a first electroplating wastewater treatment tank body 1, a stirrer 2, a second electroplating wastewater treatment tank body 5 and a micro-electric field fiber adsorbent 6;
a liquid inlet 11 is arranged at the upper part of the first electroplating wastewater treatment tank body 1, and a water outlet 12 is arranged at the bottom of the first electroplating wastewater treatment tank body 1; the stirrer 2 is arranged in the first electroplating wastewater treatment tank body 1, and the stirrer 2 consists of a stirring paddle 21, a rotating shaft 22 and a motor 23; one end of the rotating shaft 22 penetrates out of the top of the first electroplating wastewater treatment tank body 1 and is connected with a transmission shaft of a motor 23; a plurality of stirring paddles 21 are installed on the rotating shaft 22; the stirring paddle 21 is an arc-shaped plate, the thickness of the arc-shaped plate is gradually reduced from the rotating shaft to the inner wall of the first electroplating wastewater treatment tank body 1, and the lower end surface of the arc-shaped plate is inwards sunken to form a notch 221; the notches 221 of the adjacent upper stirring paddle 21 and the lower stirring paddle 21 are arranged oppositely; the convex surface of the arc-shaped plate faces the rotating direction of the stirring paddle 21;
a plurality of aeration openings I3 are formed in the bottom in the first electroplating wastewater treatment tank body 1; a plurality of bulges 4 are arranged on the inner side wall of the first electroplating wastewater treatment tank body 1 along the circumferential direction; an adsorbent is added into the first electroplating wastewater treatment tank body 1;
the first water inlet of the second electroplating wastewater treatment tank body 5 is communicated with the water outlet 12 of the first electroplating wastewater treatment tank body 1 through a pipeline, the water outlet of the second electroplating wastewater treatment tank body 5 is communicated with the water inlet of the circulating water pump 8 through a pipeline, and the water outlet of the circulating water pump 8 is communicated with the second water inlet of the second electroplating wastewater treatment tank body 5; a micro-electric field fiber adsorbent 6 is arranged in the second electroplating wastewater treatment tank body 5, and the micro-electric field fiber adsorbent 6 consists of a frame body 61, two metal conductors 64, a metal net 62, an electrode plate and a carbon fiber felt loaded with nickel ferrite; the metal net 62 is wound on the outer surface of the frame body 61, and the electrode plates consist of a positive electrode plate 63 and a negative electrode plate 65; the positive electrode plate 63 and the negative electrode plate 65 are respectively positioned at two sides of the frame body 61, the positive electrode plate 63 and the negative electrode plate 65 are respectively connected with two metal conductors 64 positioned at two sides in the frame body 61, and the outer surface of the metal mesh 62 is covered with a plurality of layers of carbon fiber felts loaded with nickel ferrite; the cavity enclosed by the frame body 61 and the metal mesh 62 is filled with an adsorbent.
The tail end of the stirring paddle 21 is tangent to the inner wall of the first electroplating wastewater treatment tank body 1.
An air outlet hole 212 is formed at the tail end of the stirring paddle 21, an air inlet channel is arranged in the rotating shaft 22 and is communicated with an air inlet arranged in the stirring paddle 21, and air blown in by the air blower is blown out from the air outlet hole 212 through the air inlet channel.
A plurality of aeration ports II 7 are arranged between the water inlet of the second electroplating wastewater treatment tank body 5 and the micro-electric field fiber adsorption body 6
And a water outlet is arranged on a pipeline between the water outlet of the second electroplating wastewater treatment tank body 5 and the water inlet of the circulating water pump 8.
The adsorbent is prepared from 12 parts of activated carbon, 6 parts of humic acid, 15 parts of kaolin, 60 parts of FCC spent catalyst, 16 parts of ferroferric oxide, 6 parts of alumina, 1 part of carboxymethyl cellulose, 5 parts of potassium acetate and 6 parts of diatomite.
The preparation method of the adsorbent comprises the following steps:
(1) Mixing the waste FCC catalyst with nano ferroferric oxide and diatomite, adjusting the pH value to 5.0, and reacting at the temperature of 60 ℃ for 10 hours; then adding humic acid and stirring for 20min to obtain a reactant;
(2) Preparing kaolin into slurry, adding potassium acetate, adjusting the pH value to 10.0, and reacting at 70 ℃ for 6 hours to obtain a kaolin reactant;
(3) Mixing activated carbon and alumina, adding carboxymethyl cellulose, uniformly mixing, and drying at the temperature of 100-300 ℃ to obtain an activated carbon material;
(4) And (3) uniformly mixing the reactant in the step (1), the kaolin reactant in the step (2) and the activated carbon material in the step (3).
The nickel ferrite-loaded carbon fiber felt is prepared by the following steps:
soaking the carbon fiber felt in a phosphoric acid solution with the mass percent of 6%, reacting for 6 hours at the temperature of 80 ℃, washing and drying to obtain an acid modified carbon fiber felt, soaking the acid modified carbon fiber felt in a mixture of nickel salt and ferric salt, adding a precipitator, and stirring for 0.8 hour to obtain the carbon fiber felt loaded with nickel ferrite; the nickel salt is nickel chloride hexahydrate, and the iron salt is ferric chloride hexahydrate; the precipitator is urea; the molar ratio of nickel ions to iron ions in the mixture of the nickel salt and the iron salt is 1; the molar ratio of the precipitant to the nickel salt is 5;the unit mass of the carbon fiber felt is 300g/m 2 The carbon fiber felt is 2cm thick.
The use method of the electroplating wastewater adsorption treatment tank comprises the following steps:
close the delivery port water valve of the first electroplating wastewater treatment jar body 1, let in the electroplating wastewater that contains nickel back in the first electroplating wastewater treatment jar body 1, be 7g according to adsorbent and electroplating wastewater quality volume ratio: adding an adsorbent in a proportion of 1L, and adjusting the pH value of the electroplating wastewater to 7 and the water temperature to 25 ℃; starting an aeration device, aerating the first electroplating wastewater treatment tank body 1 through an aeration opening I3, starting a motor 23 to enable the rotating speed of a stirring paddle 21 to be 250 revolutions per minute, blowing gas into the tank body through a gas blowing machine from a gas outlet 212 at the tail end of the stirring paddle 21, wherein the gas flow is 200mL per minute, the gas feeding is in an intermittent gas feeding mode, and the gas blowing machine blows gas for 1 time every 3 weeks of operation of the stirring paddle 21; after the electroplating wastewater stays in the first electroplating wastewater treatment tank body 1 for 1.5h, a water outlet valve of the first electroplating wastewater treatment tank body 1 is opened, the treated electroplating wastewater is led into a second electroplating wastewater treatment tank body 5, an aeration device is opened, aeration is carried out in the second electroplating wastewater treatment tank body 5 through an aeration port two 7, voltage is applied to a plate electrode, the wastewater is circularly pumped into the second electroplating wastewater treatment tank body 5 through a circulating water pump, and the hydraulic stay time of the electroplating wastewater in the second electroplating wastewater treatment tank body 5 is 1h;
the voltage applied to the electrode plate is 2.5v, and the distance between the positive electrode plate 63 and the negative electrode plate 65 is 4cm.
Comparative example 1
This comparative example differs from example 1 in that: the rotating shaft 22 of the present embodiment is a flat plate structure, and is a non-arc plate, and the lower end surface of the rotating shaft 22 is not provided with a notch 211; the tail end of the stirring paddle 21 is not provided with an air outlet 212, and air is not introduced into the first electroplating wastewater treatment tank body 1.
Comparative example 2
This comparative example differs from example 1 in that: the gas flow is 100mL/min, the gas inlet is an intermittent gas supply mode, and the gas is blown into the blowing machine for 1 time every 6 weeks of operation of the stirring paddle 21. The rotating speed of the stirring paddle 21 is 400 r/min, the pH value is 6, the water temperature is 25 ℃, the voltage applied to the electrode plate is 8v, the distance between the positive electrode plate 63 and the negative electrode plate 65 is 10cm, and the mass volume ratio of the adsorbent to the electroplating wastewater is 5g:1L ratio.
Comparative example 3
This comparative example differs from example 1 in that: the carbon fiber felt loaded with the nickel ferrite is replaced by untreated carbon fiber felt, and the micro electric field is cancelled.
Comparative example 4
This comparative example differs from example 1 in that: and the carbon fiber felt loaded with the nickel ferrite is replaced by untreated carbon fiber felt.
Comparative example 5
This comparative example differs from example 1 in that: the nickel ferrite-loaded carbon fiber felt is prepared by the following steps: and (3) soaking the carbon fiber felt in a mixture of nickel salt and ferric salt, then adding a precipitator, and stirring for 0.5-1 h to obtain the nickel ferrite-loaded carbon fiber felt.
Simulating electroplating wastewater, wherein the concentrations of the electroplating wastewater before and after adsorption are shown in the following table 1:
TABLE 1
| Cr (Total) | Ni 2+ | Cd (Total) | Cu 2+ | Zn 2+ | |
| Before adsorption (mg/L) | 155.36 | 512.34 | 89.47 | 198.74 | 104.36 |
| Example 1 (mg/L) | 0.40 | 0.03 | 0.45 | 0.15 | 0.30 |
| COMPARATIVE EXAMPLE 1 (mg/L) | 49.77 | 41.62 | 54.87 | 44.66 | 40.49 |
| COMPARATIVE EXAMPLE 2 (mg/L) | 61.73 | 53.82 | 69.44 | 65.31 | 58.30 |
| COMPARATIVE EXAMPLE 3 (mg/L) | 45.36 | 37.14 | 51.78 | 41.22 | 36.45 |
| COMPARATIVE EXAMPLE 4 (mg/L) | 38.26 | 31.69 | 45.85 | 37.91 | 33.11 |
| COMPARATIVE EXAMPLE 5 (mg/L) | 6.37 | 4.21 | 7.19 | 5.75 | 5.36 |
。
Claims (1)
1. A high-concentration electroplating wastewater adsorption treatment tank is characterized by comprising a first electroplating wastewater treatment tank body (1), a stirrer (2), a second electroplating wastewater treatment tank body (5) and a micro-electric field fiber adsorbent (6);
a liquid inlet (11) is formed in the upper part of the first electroplating wastewater treatment tank body (1), and a water outlet (12) is formed in the bottom of the first electroplating wastewater treatment tank body (1); the stirrer (2) is arranged in the first electroplating wastewater treatment tank body (1), and the stirrer (2) consists of a stirring paddle (21), a rotating shaft (22) and a motor (23); one end of the rotating shaft (22) penetrates out of the top of the first electroplating wastewater treatment tank body (1) and is connected with a transmission shaft of a motor (23); a plurality of stirring paddles (21) are arranged on the rotating shaft (22); the stirring paddle (21) is an arc-shaped plate, the thickness of the arc-shaped plate is gradually reduced from the rotating shaft to the inner wall of the first electroplating wastewater treatment tank body (1), and the lower end surface of the arc-shaped plate is inwards sunken to form a notch (221); notches (221) of the adjacent upper stirring paddle (21) and the lower stirring paddle (21) are oppositely arranged; the convex surface of the arc-shaped plate faces the rotating direction of the stirring paddle (21);
a plurality of aeration openings I (3) are arranged at the bottom in the first electroplating wastewater treatment tank body (1); a plurality of bulges (4) are arranged on the inner side wall of the first electroplating wastewater treatment tank body (1) along the circumferential direction; an adsorbent is added into the first electroplating wastewater treatment tank body (1);
a first water inlet of the second electroplating wastewater treatment tank body (5) is communicated with a water outlet (12) of the first electroplating wastewater treatment tank body (1) through a pipeline, a water outlet of the second electroplating wastewater treatment tank body (5) is communicated with a water inlet of a circulating water pump (8) through a pipeline, and a water outlet of the circulating water pump (8) is communicated with a second water inlet of the second electroplating wastewater treatment tank body (5); a micro-electric field fiber adsorbent (6) is arranged in the second electroplating wastewater treatment tank body (5), and the micro-electric field fiber adsorbent (6) consists of a frame body (61), two metal conductors (64), a metal net (62), an electrode plate and a carbon fiber felt loaded with nickel ferrite; the metal net (62) is wound on the outer surface of the frame body (61), and the electrode plate consists of a positive electrode plate (63) and a negative electrode plate (65); the positive electrode plate (63) and the negative electrode plate (65) are respectively positioned on two sides of the frame body (61), the positive electrode plate (63) and the negative electrode plate (65) are respectively connected with two metal conductors (64) positioned on two sides in the frame body (61), and the outer surface of the metal net (62) is covered with a plurality of layers of carbon fiber felts loaded with nickel ferrite; a cavity surrounded by the frame body (61) and the metal net (62) is filled with an adsorbent;
the tail end of the stirring paddle (21) is tangent to the inner wall of the first electroplating wastewater treatment tank body (1);
the tail end of the stirring paddle (21) is provided with an air outlet hole (212), an air inlet channel is arranged in the rotating shaft (22) and is communicated with an air inlet arranged in the stirring paddle (21), and air blown in by the air blower is blown out from the air outlet hole (212) through the air inlet channel;
a plurality of second aeration openings (7) are formed between the water inlet of the second electroplating wastewater treatment tank body (5) and the micro-electric field fiber adsorption body (6);
a water outlet is arranged on a pipeline between the water outlet of the second electroplating wastewater treatment tank body (5) and the water inlet of the circulating water pump (8);
the adsorbents are all prepared from 12 parts of activated carbon, 6 parts of humic acid, 15 parts of kaolin, 60 parts of FCC spent catalyst, 16 parts of ferroferric oxide, 6 parts of alumina, 1 part of carboxymethyl cellulose, 5 parts of potassium acetate and 6 parts of diatomite;
the preparation method of the adsorbent comprises the following steps:
(1) Mixing the FCC waste catalyst with nano ferroferric oxide and diatomite, adjusting the pH value to 5.0, and reacting at the temperature of 60 ℃ for 10 hours; then adding humic acid and stirring for 20min to obtain a reactant;
(2) Preparing kaolin into slurry, adding potassium acetate, adjusting the pH value to 10.0, and reacting at 70 ℃ for 6 hours to obtain a kaolin reactant;
(3) Mixing activated carbon and alumina, adding carboxymethyl cellulose, uniformly mixing, and drying at the temperature of 100-300 ℃ to obtain an activated carbon material;
(4) Uniformly mixing the reactant in the step (1), the kaolin reactant in the step (2) and the activated carbon material in the step (3);
the nickel ferrite-loaded carbon fiber felt is prepared by the following steps:
soaking the carbon fiber felt in a phosphoric acid solution with the mass percent of 6%, reacting for 6 hours at the temperature of 80 ℃, washing and drying to obtain an acid modified carbon fiber felt, soaking the acid modified carbon fiber felt in a mixture of nickel salt and ferric salt, adding a precipitator, and stirring for 0.8 hour to obtain the carbon fiber felt loaded with nickel ferrite; the nickel salt is nickel chloride hexahydrate, and the iron salt is ferric chloride hexahydrate; the precipitator is urea; the molar ratio of nickel ions to iron ions in the mixture of the nickel salt and the iron salt is 1; the molar ratio of the precipitant to the nickel salt is 5; the unit mass of the carbon fiber felt is 300g/m 2 The carbon fiber felt of (2), the thickness of the carbon fiber felt is 2cm;
the use method of the high-concentration electroplating wastewater adsorption treatment tank comprises the following specific steps:
closing the water outlet water valve of the first electroplating wastewater treatment tank body (1), introducing nickel-containing electroplating wastewater into the first electroplating wastewater treatment tank body (1) and then treating the electroplating wastewater by using the adsorbent according to the mass-to-volume ratio of the adsorbent to the electroplating wastewater of 7g: adding an adsorbent in a proportion of 1L, and adjusting the pH value of the electroplating wastewater to 7 and the water temperature to 25 ℃; starting an aeration device, aerating the first electroplating wastewater treatment tank body (1) through an aeration port I (3), starting a motor (23) to enable the rotating speed of a stirring paddle (21) to be 250 revolutions per minute, blowing gas into the tank body through a gas blower from a gas outlet hole 212 at the tail end of the stirring paddle (21), wherein the gas flow is 200mL per minute, the gas is fed in an intermittent gas feeding mode, and the gas blower blows gas for 1 time every 3 weeks of operation of the stirring paddle (21); after the electroplating wastewater stays in the first electroplating wastewater treatment tank body (1) for 1.5h, a water outlet valve of the first electroplating wastewater treatment tank body (1) is opened, the treated electroplating wastewater is led into a second electroplating wastewater treatment tank body (5), an aeration device is opened, aeration is carried out in the second electroplating wastewater treatment tank body (5) through an aeration port II (7), voltage is applied to an electrode plate at the same time, the wastewater is circularly pumped into the second electroplating wastewater treatment tank body (5) through a circulating water pump, and the hydraulic stay time of the electroplating wastewater in the second electroplating wastewater treatment tank body (5) is 1h;
the voltage applied by the electrode plates is 2.5v, and the distance between the positive electrode plate (63) and the negative electrode plate (65) is 4cm.
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