CN213771646U - Remove mercury device in waste water - Google Patents
Remove mercury device in waste water Download PDFInfo
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- CN213771646U CN213771646U CN202022861526.2U CN202022861526U CN213771646U CN 213771646 U CN213771646 U CN 213771646U CN 202022861526 U CN202022861526 U CN 202022861526U CN 213771646 U CN213771646 U CN 213771646U
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Abstract
The utility model discloses a remove mercury device in waste water belongs to the environmental protection equipment field, and it includes that oxidation reaction tank, oxidation charge device, demercuration reaction tank, demercuration agent add device, flocculation reaction tank, flocculating agent add device, sedimentation tank, mud filter pressing device, water purification retrieval and utilization device. In this application, earlier carry out the oxidation to the mercury of different forms, form bivalent mercury ion, then add demercuration agent, make mercury ion form extremely stable bivalent mercury salt deposit, get rid of the bivalent mercury salt deposit in the waste water through the method of flocculation, deposit at last, the waste water after the purification can be retrieved for use, or discharge up to standard. The device has the advantages of ingenious design, reasonable structure, convenience in use, simplicity in operation, short process flow and good treatment effect, can meet the requirements of industrialization, large-scale production and application, and has high application value and good application prospect.
Description
Technical Field
The utility model belongs to the technical field of chemical industry equipment and specifically relates to a remove mercury device in waste water and specifically relates to the environmental protection equipment field. More specifically, the application is a device for removing mercury from waste water, and the device is mainly used for removing mercury from waste water, and has good effect and application prospect.
Background
Mercury is widely used in industrial and agricultural production, metallurgy, chemical industry and other aspects, including industrial departments of chlor-alkali, paper making, explosive, pesticide, electronic instruments, organic synthesis, paint, fur processing and the like. Mercury itself has the characteristics of being highly toxic, bioaccumulation, easy volatilization, easy migration, easy conversion, difficult biodegradation and the like, and has great harm to the environment and human health, thereby being widely concerned. Meanwhile, the metallic mercury itself is not degradable, and once discharged, the pollution is long-term. Mercury is the first type of pollutant whose emission requirements must be below 0.05 mg/L. The existing states of mercury in wastewater are classified into organic mercury, monovalent mercury and divalent mercury.
At present, research on mercury-containing waste treatment devices has been conducted, but the number thereof is relatively small. For example, chinese patent application CN201220001289.5 discloses a system for removing elemental mercury from flue gas by injection discharge activation method, in which a discharge device is inserted into a flue, then oxygen, oxygen-rich gas or oxygen-containing air is fed into the discharge device by injection, and ozone O is generated under the action of discharge plasma3Active substances of atomic oxygen O and hydroxyl OH become active gas; the active gas is discharged from the outlet of the discharge device and enters a flue; in the flue, the active gas reacts with the elemental mercury in the flue gas to oxidize the elemental mercury into divalent mercury.
Chinese patent application CN201821671696.0 discloses a flue gas mercury absorbs remove device, and it is absorbed mercury through setting up a plurality of activated carbon plates that the circumference was arranged and can be rotatory and get rid of to improve activated carbon plate's adsorption efficiency, peg graft simultaneously and rotate epaxial activated carbon plate and can realize quick replacement, thereby guarantee technical effect such as activated carbon plate absorption efficiency to flue gas mercury.
Chinese patent application CN201520288989.0 discloses a device for removing mercury in wastewater by using adsorption method, which adopts a downward-attack water flow filtering mode when treating mercury-containing wastewater, the mercury-containing wastewater firstly enters into a downward water-filling area, and enters into an adsorbent filling area through a screen and a lower porous cloth bushing, and is adsorbed in the adsorbent filling area to remove mercury, and then enters into an upper water-filling area through the screen and an upper porous cloth bushing, and finally is discharged through a water outlet pipe.
The existing mercury-containing flue gas is mainly removed by adopting discharge plasma oxidation or activated carbon plate adsorption. And for the mercury-containing wastewater, the adsorbent filler is mainly used for adsorption and removal. Therefore, the inventor of the application provides a device for removing mercury in wastewater, so as to solve the problems.
SUMMERY OF THE UTILITY MODEL
The invention aims to provide a device for removing mercury in wastewater. In this application, earlier carry out the oxidation to the mercury of different forms, form bivalent mercury ion, then add demercuration agent, make mercury ion form extremely stable bivalent mercury salt deposit, get rid of the bivalent mercury salt deposit in the waste water through the method of flocculation, deposit at last, the waste water after the purification can be retrieved for use, or discharge up to standard. The device has the advantages of ingenious design, reasonable structure, convenience in use, simplicity in operation, short process flow and good treatment effect, can meet the requirements of industrialization, large-scale production and application, and has high application value and good application prospect.
In order to achieve the purpose, the following technical scheme is adopted in the application:
an apparatus for removing mercury from wastewater, comprising:
the oxidation reaction tank, the waste water containing mercury to be treated can be mixed with oxidant in the oxidation reaction tank, and the mercury in the waste water containing mercury is oxidized into bivalent mercury ions;
the oxidation dosing device is connected with the oxidation reaction tank and is used for adding an oxidant into the oxidation reaction tank and oxidizing mercury in the mercury-containing wastewater in the oxidation reaction tank into divalent mercury ions;
the demercuration reaction tank is connected with the oxidation reaction tank, the mercury-containing wastewater subjected to oxidation treatment in the oxidation reaction tank can enter the demercuration reaction tank, and the demercuration agent in the demercuration reaction tank reacts with the bivalent mercury in the mercury-containing wastewater to generate mercuric sulfide precipitate;
the demercuration agent adding device is connected with the demercuration reaction tank and is used for adding the demercuration agent into the demercuration reaction tank;
the flocculation reaction tank is connected with the demercuration reaction tank, and wastewater treated in the demercuration reaction tank can enter the flocculation reaction tank to form flocculate through the action of a flocculating agent in the flocculation reaction tank and the wastewater;
the flocculating agent adding device is connected with the flocculation reaction tank and can add flocculating agent into the flocculation reaction tank;
the sedimentation tank is connected with the flocculation reaction tank and can filter the mixture formed in the flocculation reaction tank to form sediment and filtrate;
the sludge filter pressing device is connected with the sedimentation tank, and sediment generated by the sedimentation tank can be subjected to filter pressing treatment by the sludge filter pressing device to form sludge;
and the purified water recycling device is connected with the sedimentation tank, and the filtered liquid generated by the sedimentation tank can enter the purified water recycling device.
The oxidation dosing device is one of a sodium hypochlorite adding device, an ozone adding device and a hydrogen peroxide adding device.
The mercury removing agent added by the mercury removing agent adding device is one of sodium sulfide, sodium hydrogen sulfide and magnesium sulfide.
The flocculating agent added by the flocculating agent adding device is one of lime, iron salt and aluminum salt. Preferably, the flocculating agent added by the flocculating agent adding device is lime, ferric sulfate or polyaluminium chloride.
The purified water recycling device is a water storage tank.
Still include first alkali lye adding device, first alkali lye adding device links to each other with the flocculation reaction pond and first alkali lye adding device can be adjusted the waste water in the flocculation reaction pond to weak alkaline.
Still include second lye and add the device, second lye adds the device and links to each other with the sedimentation tank and second lye adds the device and can adjust to weak alkaline with the waste water in the sedimentation tank.
To the foregoing problems, the present application provides an apparatus for removing mercury from wastewater. The device comprises an oxidation reaction tank, an oxidation dosing device, a demercuration reaction tank, a demercuration agent adding device, a flocculation reaction tank, a flocculating agent adding device, a sedimentation tank, a sludge filter pressing device and a purified water recycling device.
The working process of the device is as follows:
(1) after pretreatment such as removal of suspended matters and the like, the mercury-containing wastewater is sent to an oxidation reaction tank;
(2) adding an oxidant into the oxidation reaction tank through an oxidation dosing device to oxidize monovalent mercury in the mercury-containing wastewater into divalent mercury;
(3) sending the wastewater oxidized in the oxidation reaction tank into a demercuration reaction tank, and adding a demercuration agent (usually sodium sulfide, sodium hydrogen sulfide, magnesium sulfide and the like) into the demercuration reaction tank through a demercuration agent adding device, so that the bivalent mercury is converted into water-insoluble mercuric sulfide to be precipitated and separated out, and the purpose of removing the bivalent mercury in the water is achieved, wherein the relevant reactions are shown as the following formulas (1) - (2):
NaHS+H2O→H2S+NaOH （1），
Hg2++S2-→HgS↓ （2）；
(4) sending the wastewater treated by the demercuration reaction tank into a flocculation reaction tank, adjusting the pH value of the wastewater in the flocculation reaction tank to 8-10 by a first alkali liquor adding device, adding a flocculating agent into the wastewater by a flocculating agent adding device to form hydroxide flocs in the flocculation reaction tank, wherein the hydroxide flocs act on mercury sulfide to separate out the mercury sulfide in the wastewater to form flocs, and the related reactions are as shown in the following formulas (3) - (4):
2KAl(SO4)2→K2SO4+Al2(SO4)3 （3），
Al3++3OH-→Al(OH)3↓ （4）；
(5) the mixture in the flocculation reaction tank is sent into a sedimentation tank, suspended matters in the mixture are effectively removed, and sediment and filtrate are respectively obtained; in a sedimentation tank, Na is utilized under the alkalescent condition2S, MgS S2-With Hg+/Hg2+The reaction formula and the solubility product constant are shown as the following formulas (5) - (6):
Hg++S2-=Hg2S Ksp=1.8×10-45 （5），
Hg2++S2-=HgS Ksp =1.6×10-54 （6）；
when the initial mercury concentration is higher, the removal rate can reach more than 99.9 percent; by adopting the method, the mercury content of the wastewater can be reduced to 0.5-10 mu g/L;
(6) the mercury content in the filtrate obtained by the sedimentation tank reaches the relevant emission standard, and the filtrate can be recycled or discharged.
After research and analysis, the inventor finds that the existing states of mercury in the wastewater are divided into organic mercury, monovalent mercury and divalent mercury. Wherein, the mercury entering the wastewater is mainly monovalent mercury and divalent mercury. And the divalent mercury is easy to form stable precipitate with the mercury removing agent, and the formed precipitate is difficult to dissolve, so that the concentration of mercury in the water body is lower than 0.05mg/L, and the corresponding national emission standard is met. By adopting the method, firstly, the oxidant is added into the wastewater to oxidize the univalent mercury in the wastewater into bivalent mercury ions; then, by adding a mercury removing agent, divalent mercury ions form extremely stable divalent mercury salt precipitate; finally, mercury salt is precipitated through a flocculation reaction tank and a sedimentation tank, and precipitates and filtrate are respectively formed; the purified filtering liquid can be reused in the original process link or directly discharged.
By adopting the method and the device, the mercury removal treatment of the mercury-containing wastewater can be realized, and the treated filtrate can completely reach the national discharge standard and can be recycled or discharged. The method can realize the removal of mercury in the wastewater, has short process flow and good treatment effect, can meet the requirement of industrial wastewater treatment, and has better application prospect.
Drawings
FIG. 1 is a schematic view showing the construction of an apparatus for removing mercury from wastewater in example 1.
The labels in the figure are: 1. the system comprises an oxidation reaction tank, 2, an oxidation dosing device, 3, a demercuration reaction tank, 4, a demercuration agent adding device, 5, a flocculation reaction tank, 6, a sedimentation tank, 7, a sludge filter pressing device, 8 and a purified water recycling device.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in the figure, the device for removing chromium in wastewater comprises an oxidation reaction tank, an oxidation dosing device, a demercuration reaction tank, a demercuration agent adding device, a flocculation reaction tank, a flocculating agent adding device, a sedimentation tank, a sludge press filtration device and a purified water recycling device.
In the embodiment, the oxidation dosing device is connected with the oxidation reaction tank; and (2) placing the mercury-containing wastewater to be treated in an oxidation reaction tank, adding an oxidant into the oxidation reaction tank through an oxidation dosing device, and oxidizing monovalent mercury ions in the mercury-containing wastewater in the oxidation reaction tank into divalent mercury ions through the oxidant to obtain a first intermediate solution. The oxidation reaction tank is connected with the demercuration reaction tank, and the demercuration agent adding device is connected with the demercuration reaction tank; and after the first intermediate solution enters the demercuration reaction tank, adding a demercuration agent into the demercuration reaction tank through a demercuration agent adding device, and converting bivalent mercury in the mercury-containing wastewater into mercuric sulfide precipitate through the demercuration agent to obtain a second intermediate solution. The demercuration reaction tank and the flocculating agent adding device are respectively connected with the flocculation reaction tank; the second intermediate solution treated in the demercuration reaction tank enters a flocculation reaction tank, and is added into the flocculation reaction tank through a flocculating agent adding deviceAnd (4) flocculating by using the flocculating agent to form flocculates in the flocculation reaction tank to obtain a third intermediate liquid. The flocculation reaction tank is connected with the sedimentation tank; the third intermediate solution in the flocculation reaction tank enters a sedimentation tank, and the wastewater in the sedimentation tank is adjusted to be alkalescent S2-With Hg+/Hg2+And mercury sulfide precipitate is formed continuously, and precipitate and filtrate are formed in the sedimentation tank. The sludge filter-pressing device and the purified water recycling device are respectively connected with the sedimentation tank; in the structure, sediment generated by the sedimentation tank can be subjected to filter pressing treatment by a sludge filter pressing device to form sludge; meanwhile, the filtrate generated by the sedimentation tank can enter the purified water recycling device and can be discharged or recycled.
In the application, firstly, an oxidant is added into the wastewater to oxidize various forms of mercury into divalent mercury ions; then, adding a mercury removing agent to enable mercury ions to form extremely stable divalent mercury salt precipitate; then, forming a precipitate from the mercury salt by flocculation and precipitation methods, and separating the precipitate and the filtrate; the purified filtrate can be reused in the original process or directly discharged.
Example 1
The device is adopted to treat the mercury-containing wastewater. The components of the mercury-containing wastewater to be treated are as follows: the inorganic mercury content is 155 mug/L, and the flow rate is 50L/h.
In this embodiment, the oxidant added by the oxidation dosing device is ozone, and the dosage of the oxidant is 5 mg/L. The mercury removing agent added by the mercury removing agent adding device is Na2S, the dosage is 5 mg/L. The flocculating agent added by the flocculating agent adding device is FeCl3The dosage is 2 mg/L.
The filtrate in the purified water recycling device is measured, and the measurement result is as follows: 3 μ g/L.
Example 2
The device is adopted to treat the mercury-containing wastewater. The components of the mercury-containing wastewater to be treated are as follows: the mercury content is 25mg/L, and the flow rate is 15L/h.
In this embodiment, the oxidant added by the oxidation dosing device is sodium hypochlorite, and the dosage of the oxidant is 5 mg/L. The demercuration agent added by the demercuration agent adding device is sodium hydrogen sulfide, the adding amount is 35mg/L, the flocculating agent added by the flocculating agent adding device is aluminum sulfate, and the adding amount is 3 mg/L.
The filtrate in the purified water recycling device is measured, and the measurement result is as follows: 0.013 mg/L.
Example 3
The device is adopted to treat the mercury-containing wastewater. The components of the mercury-containing wastewater to be treated are as follows: the mercury content was 500. mu.g/L and the flow rate was 15L/h.
In the embodiment, the oxidant added by the oxidation dosing device is hydrogen peroxide, and the adding amount of the oxidant is 5 mg/L. The demercuration agent added by the demercuration agent adding device is sodium hydrogen sulfide, and the adding amount is 4 mg/L. The flocculating agent added by the flocculating agent adding device is ferric sulfate, and the adding amount is 3 mg/L.
The filtrate in the purified water recycling device is measured, and the measurement result is as follows: 4.6. mu.g/L.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. An apparatus for removing mercury from wastewater, comprising:
the oxidation reaction tank, the waste water containing mercury to be treated can be mixed with oxidant in the oxidation reaction tank, and the mercury in the waste water containing mercury is oxidized into bivalent mercury ions;
the oxidation dosing device is connected with the oxidation reaction tank and is used for adding an oxidant into the oxidation reaction tank and oxidizing mercury in the mercury-containing wastewater in the oxidation reaction tank into divalent mercury ions;
the demercuration reaction tank is connected with the oxidation reaction tank, the mercury-containing wastewater subjected to oxidation treatment in the oxidation reaction tank can enter the demercuration reaction tank, and the demercuration agent in the demercuration reaction tank reacts with the bivalent mercury in the mercury-containing wastewater to generate mercuric sulfide precipitate;
the demercuration agent adding device is connected with the demercuration reaction tank and is used for adding the demercuration agent into the demercuration reaction tank;
the flocculation reaction tank is connected with the demercuration reaction tank, and wastewater treated in the demercuration reaction tank can enter the flocculation reaction tank to form flocculate through the action of a flocculating agent in the flocculation reaction tank and the wastewater;
the flocculating agent adding device is connected with the flocculation reaction tank and can add flocculating agent into the flocculation reaction tank;
the sedimentation tank is connected with the flocculation reaction tank and can filter the mixture formed in the flocculation reaction tank to form sediment and filtrate;
the sludge filter pressing device is connected with the sedimentation tank, and sediment generated by the sedimentation tank can be subjected to filter pressing treatment by the sludge filter pressing device to form sludge;
and the purified water recycling device is connected with the sedimentation tank, and the filtered liquid generated by the sedimentation tank can enter the purified water recycling device.
2. The device of claim 1, wherein the oxidation dosing device is one of a sodium hypochlorite adding device, an ozone adding device and a hydrogen peroxide adding device.
3. The device according to claim 1 or 2, wherein the mercury removing agent added by the mercury removing agent adding device is one of sodium sulfide, sodium hydrogen sulfide and magnesium sulfide.
4. The device according to claim 1, wherein the flocculating agent added by the flocculating agent adding device is one of lime, iron salt and aluminum salt.
5. The device of claim 1, wherein the clean water recycling device is a water storage tank.
6. The apparatus of claim 1, 2, 4 or 5, further comprising a first alkali liquid adding device, wherein the first alkali liquid adding device is connected with the flocculation reaction tank and can adjust the wastewater in the flocculation reaction tank to be alkalescent.
7. The apparatus of claim 1, further comprising a second lye addition device connected to the settling tank and capable of adjusting the wastewater in the settling tank to a weak alkalinity.
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| CN202022861526.2U CN213771646U (en) | 2020-12-02 | 2020-12-02 | Remove mercury device in waste water |
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| CN202022861526.2U CN213771646U (en) | 2020-12-02 | 2020-12-02 | Remove mercury device in waste water |
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