CN213738984U - Device for removing arsenic and antimony in wastewater - Google Patents
Device for removing arsenic and antimony in wastewater Download PDFInfo
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- CN213738984U CN213738984U CN202022851692.4U CN202022851692U CN213738984U CN 213738984 U CN213738984 U CN 213738984U CN 202022851692 U CN202022851692 U CN 202022851692U CN 213738984 U CN213738984 U CN 213738984U
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Abstract
The utility model discloses a get rid of device of arsenic and antimony in waste water belongs to the environmental protection equipment field, and it includes that oxidation reaction tank, oxidation charge device, chemistry catch pond, trapping agent add device, flocculation reaction tank, sedimentation tank, mud filter pressing device, mud temporary storage device, water purification retrieval and utilization device. Based on the characteristics that the properties of arsenic and antimony are close and the ionic valence states are the same, the arsenic-containing wastewater and the antimony-containing wastewater are combined; firstly, oxidizing low-valence arsenic and antimony into high-valence arsenic and antimony through oxidation reaction, then realizing effective precipitation of the arsenic and the antimony through coprecipitation reaction, and finally realizing separation of precipitates and filtrate through a precipitation filtration method to achieve the purpose of removing the arsenic and the antimony in the wastewater; the purified filtrate can be recycled or discharged after reaching the standard. The device has the advantages of ingenious conception, reasonable structure, convenience in use, simplicity in operation, short process flow, good treatment effect, 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 an apparatus for getting rid of arsenic and antimony in waste water belongs to the environmental protection equipment field. More specifically, the device for removing arsenic and antimony from wastewater is mainly used for removing arsenic and antimony from wastewater, and has good effect and application prospect.
Background
Arsenic is in the fourth VA main group of the periodic table and is widely distributed in the environment, wherein inorganic arsenic mainly exists in two forms of As (V) and As (III). Arsenic is an unnecessary element for human bodies, the toxicity of simple substance arsenic is low, the compounds of arsenic are all highly toxic, trivalent arsenic compounds are more toxic than pentavalent arsenic compounds, and organic arsenic is highly toxic to human bodies and organisms. Arsenic can enter human body through respiratory tract, digestive tract and skin contact, and is accumulated in human body, causing chronic arsenic poisoning, and the incubation period is as long as several years and even several decades. Arsenic, a protoplasmic poison, is toxic by interacting with sulfhydryl groups of proteins and enzymes (denaturing proteins and enzymes inside cells) and increasing reactive oxygen species inside cells, causing cell damage, and presents various degrees of harm to various system organs of the human body. Meanwhile, arsenic also has genetic toxicity and belongs to the pollution control priority of the world health organization. If arsenic is not controlled, the environment is easily polluted, and once the pollution is formed, the pollution is difficult to eliminate.
In the common copper, lead, zinc and tin sulfide concentrate ores of mineral products, nonferrous metallurgy chemical industry, smelting and the like, a certain amount of arsenic is associated, smelting sintering or roasting is carried out, most of sulfur and arsenic are oxidized and volatilized into gas, and acid wastewater containing arsenic is generated after leaching and impurity removal. In the arsenic-containing wastewater, arsenic mostly exists in the forms of trivalent arsenic and pentavalent arsenic, the trivalent arsenic is difficult to remove than the pentavalent arsenic, and precipitates of the trivalent arsenic are unstable, which brings difficulty to subsequent treatment. In wastewater, arsenic typically enters the wastewater in the form of arsenate.
Antimony is located in the VA main group of the fifth period of the periodic table, and antimony is mainly found in sulfide mineral stibnite in nature. Since the end of the 20 th century, China has become the world's largest country for producing antimony and its compounds. Among them, antimony compounds are generally classified into trivalent and pentavalent types. Antimony is a global pollutant and one of the most internationally interesting toxic metal elements. The process of antimony absorption and adsorption by organisms depends on the form and microenvironment of antimony such as microorganisms, and the dissolved trivalent antimony is easily absorbed by the root system of plants, while the pentavalent antimony is difficult to absorb. Thus, trivalent antimony is more environmentally polluting. In the wastewater, antimony typically enters the wastewater in trivalent and pentavalent form.
In order to solve the problem of antimony pollution, a part of the invention patents disclose corresponding schemes. For example, chinese patent application CN200710191877.3 discloses a method for removing semimetal antimony ions in wastewater, which is to perform constant current electrochemical reduction deposition on semimetal ions in a solution in a dilute sulfuric acid acidification medium by using a three-electrode or two-electrode system and a titanium mesh as a working electrode, so that the semimetal ions are precipitated on the working electrode in the form of semimetal or oxide thereof, and toxic antimony ions in weakly acidic, low-content and other wastewater are effectively removed; meanwhile, by adjusting the acidity of the medium, the electrodeposition treatment of trivalent antimony, pentavalent antimony and the total amount of antimony can be respectively realized.
Chinese patent application CN201110429476.3 discloses a cheap adsorbent for removing trivalent antimony from water, a preparation method and an application thereof, the adsorbent is a powdery adsorbent formed by calcining rice hulls, and the preparation method comprises the following steps: cleaning rice husks and removing dirt and impurities on the surfaces of the rice husks; and drying, calcining and cooling the cleaned rice husks to obtain the cheap adsorbent for removing the trivalent antimony in the water.
Chinese patent application CN201310148582.3 discloses a method for removing heavy metal antimony in a water body by using Fred salt, which comprises the steps of firstly adjusting the pH value of the water body containing the heavy metal antimony to 8.5-9.0 by using lime, then adopting the Fred salt as an Sb (V) ion exchanger and an Sb (III) flocculation-adsorbent, putting the Fred salt into the water body according to the solid-liquid ratio of 5: 10000-2: 1000, stirring the water body while putting the Fred salt into the water body, and then settling the mixed liquid after hydraulic stirring in a settling pond for 1 hour to enable the heavy metal antimony in the water body to be contained in a precipitate, so that the heavy metal antimony is separated from the water body, and thus the heavy metal antimony in the water body can be removed.
Chinese patent application CN201510131879.8 discloses a method for removing pentavalent antimony pollutants in water by manganese ion enhanced electrochemistry, which comprises the steps of adding a manganese ion solution into an electrochemical reactor, wherein the manganese ions in the manganese ion solution enhance the reduction of pentavalent antimony into trivalent antimony, and simultaneously, the generated manganese dioxide with higher adsorption capacity enhances the removal of the trivalent antimony pollutants by electrocoagulation.
The inventor finds in practice that arsenic, antimony and bismuth are common accompanying elements of copper minerals, and arsenic and antimony pollutants are often simultaneously present. In addition, because the properties of arsenic and antimony are similar, the arsenic-containing wastewater and the antimony-containing wastewater are combined for treatment, so that the quantity of treatment equipment is simplified, and the wastewater treatment cost is reduced. Therefore, the application provides a device for removing arsenic and antimony in wastewater to solve the problems.
SUMMERY OF THE UTILITY MODEL
The invention aims to provide a device for removing arsenic and antimony in wastewater. In the application, based on the characteristics that the arsenic and the antimony are close in property and the ion valence states are the same, the arsenic-containing wastewater and the antimony-containing wastewater are combined; firstly, oxidizing low-valence arsenic and antimony into high-valence arsenic and antimony through oxidation reaction, then realizing effective precipitation of the arsenic and the antimony through coprecipitation reaction, and finally realizing separation of precipitates and filtrate through a precipitation filtration method to achieve the purpose of removing the arsenic and the antimony in the wastewater; the purified filtrate can be recycled or discharged after reaching the 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 arsenic and antimony from wastewater, comprising:
the waste water containing arsenic and antimony to be treated can be mixed with an oxidant in the oxidation reaction tank, and trivalent arsenic and trivalent antimony in the waste water containing arsenic and antimony are respectively oxidized into pentavalent arsenic and pentavalent antimony;
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 trivalent arsenic and trivalent antimony in the arsenic-antimony-containing wastewater in the oxidation reaction tank into pentavalent arsenic and pentavalent antimony respectively;
the chemical trapping pool is connected with the oxidation reaction pool, the wastewater after oxidation treatment in the oxidation reaction pool can enter the chemical trapping pool, and the arsenic and the antimony in the wastewater respectively form complex precipitates by the action of ferric salt and lime milk added into the chemical trapping pool and pentavalent arsenic and pentavalent antimony in the wastewater;
the trapping agent adding device is connected with the chemical trapping pool and is used for adding ferric salt and lime milk into the chemical trapping pool;
the flocculation reaction tank is connected with the chemical capture tank, and reaction products in the chemical capture tank can enter the flocculation reaction tank for flocculation and generate a flocculation mixture;
the sedimentation tank is connected with the flocculation reaction tank, and a flocculation mixture formed in the flocculation reaction tank can be subjected to standing sedimentation in the sedimentation 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;
the sludge temporary storage device is connected with the sludge filter-pressing device, and sludge generated by the sludge filter-pressing device can enter the sludge temporary storage device for temporary storage;
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 pretreatment tank is connected with the oxidation reaction tank, and the arsenic-antimony-containing wastewater to be treated can enter the oxidation reaction tank after suspended matter impurities are removed from the pretreatment tank.
The pretreatment tank is used for removing suspended matters in the arsenic-antimony-containing wastewater.
The pretreatment tank is a suspended matter filtering tank.
The oxidation dosing device is one of a hydrogen peroxide dosing device, an ozone dosing device, a sodium hypochlorite dosing device and a potassium permanganate dosing device.
The trapping agent adding device comprises an iron salt adding device and a lime milk adding device.
The iron salt adding device is a ferrous sulfate dosing device.
The trapping agent added by the trapping agent adding device is ferric salt and lime milk.
The purified water recycling device is a water storage tank.
The first acid liquid adding device is connected with the oxidation reaction tank and can adjust the wastewater in the oxidation reaction tank to be weakly acidic.
Still include the precipitant and add the device, the precipitant adds the device and links to each other with the flocculation reaction pond and the precipitant adds the device and can add the precipitant in order to promote the going on of flocculation reaction in the flocculation reaction pond to the flocculation reaction pond.
In view of the foregoing, the present application provides an apparatus for removing arsenic and antimony from wastewater. The device comprises an oxidation reaction tank, an oxidation dosing device, a chemical trapping tank, a trapping agent adding device, a flocculation reaction tank, a sedimentation tank, a sludge filter pressing device, a sludge temporary storage 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 arsenic-antimony-containing wastewater is sent to an oxidation reaction tank;
(2) adding an oxidant into the oxidation reaction tank through an oxidation dosing device, and adding oxygen into the oxidation dosing deviceThe reagent is H2O2Respectively oxidizing trivalent arsenic and trivalent antimony in the arsenic-antimony-containing wastewater into pentavalent arsenic and pentavalent antimony by using a solution or ozone, sodium hypochlorite or potassium permanganate and the like;
(3) sending the wastewater after oxidation treatment in the oxidation reaction tank into a chemical capture tank, adding a capture agent into the chemical capture tank through a capture agent adding device, and enabling arsenic and antimony in the wastewater to form complex precipitates respectively (in the application, the capture agent is ferric salt and lime cream, and the arsenic and antimony are removed from the wastewater by complexing at the same time of iron precipitation through coprecipitation, wherein in the link, the removal rate of the arsenic and the antimony can reach about 95%);
(4) the wastewater treated by the chemical capture pool is sent into a flocculation reaction pool, and then the flocculation reaction pool is stirred and the like, so that reaction products in the chemical capture pool are flocculated in the flocculation reaction pool to generate a flocculation mixture;
(5) sending the flocculated mixture in the flocculation reaction tank into a sedimentation tank, standing and separating to obtain a precipitate and a filtrate respectively; sending the precipitate into a sludge filter-pressing device, carrying out filter-pressing treatment to obtain filter-pressing sludge, sending the filter-pressing sludge into a sludge temporary storage device, and carrying out harmless treatment subsequently;
(6) the arsenic and antimony content in the filtrate obtained by the sedimentation tank reaches the relevant discharge standard, and the filtrate can be recycled or discharged.
Preferably, the device also comprises a precipitator adding device connected with the flocculation reaction tank. The device of this application is in the course of the work, and when the flocculation reaction in the flocculation reaction pond was carried out incompletely, accessible precipitant adds the device and adds the precipitant to the flocculation reaction pond in to promote the going on of flocculation reaction in the flocculation reaction pond.
By adopting the method and the device, the arsenic-containing wastewater and the antimony-containing wastewater can be combined, the treatment process flow is short, the treatment effect is good, and the treated filtrate can completely reach the national discharge standard and can be recycled or discharged. The method can realize removal of arsenic and antimony in the wastewater, can meet the requirement of industrial wastewater treatment, and has a good 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 chemical trapping tank, 4, a trapping agent adding device, 5, a flocculation reaction tank, 6, a sedimentation tank, 7, a sludge filter pressing device, 8, a purified water recycling device, 9 and a sludge temporary storage 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 arsenic and antimony in wastewater in the embodiment comprises an oxidation reaction tank, an oxidation dosing device, a chemical trapping tank, a trapping agent adding device, a flocculation reaction tank, a sedimentation tank, a sludge filter pressing device, a sludge temporary storage device and a water purification recycling device.
In the embodiment, the oxidation dosing device is connected with the oxidation reaction tank; and (2) placing the arsenic-antimony-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 trivalent arsenic and trivalent antimony in the arsenic-antimony-containing wastewater in the oxidation reaction tank into pentavalent arsenic and pentavalent antimony respectively through the oxidant to obtain a first intermediate solution. The oxidation reaction tank is connected with the chemical capture tank, and the capture agent adding device is connected with the chemical capture tank; after the first intermediate solution enters the chemical trapping pool, ferric salt and lime milk are added into the chemical trapping pool through a trapping agent adding device, and arsenic and antimony in the wastewater respectively form complex precipitates through the action of the ferric salt and the lime milk and pentavalent arsenic and pentavalent antimony in the wastewater to obtain a second intermediate solution. The chemical catching pool is connected with the flocculation reaction pool; and the second intermediate liquid enters the flocculation reaction tank, and the second intermediate liquid in the chemical trapping tank is flocculated in the flocculation reaction tank through operations such as stirring and the like to generate a flocculation mixture which is marked as a third intermediate liquid. The flocculation reaction tank is connected with the sedimentation tank; and (4) allowing the third intermediate solution in the flocculation reaction tank to enter a sedimentation tank for standing and sedimentation, and forming sediment and filtrate. The sludge filter pressing device and the purified water recycling device are respectively connected with the sedimentation tank, and the sludge temporary storage device is connected with the sludge filter pressing device; in the structure, sediment generated by the sedimentation tank can be subjected to filter pressing treatment through the sludge filter pressing device to form sludge, the sludge can be fed into the sludge temporary storage device for temporary storage, and harmless treatment can be carried out subsequently; meanwhile, the filtrate generated by the sedimentation tank can enter the purified water recycling device and can be discharged or recycled. Preferably, the collector adding device of the embodiment comprises an iron salt adding device and a lime milk adding device. Further, the embodiment also comprises a precipitator adding device, wherein the precipitator adding device is connected with the flocculation reaction tank; by adopting the structure, the precipitator adding device can be used for adding the precipitator into the flocculation reaction tank so as to promote the flocculation reaction in the flocculation reaction tank.
Further, the process flow of the device is described as follows:
(1) after pretreatment such as removal of suspended matters and the like, the arsenic-antimony-containing wastewater is sent to an oxidation reaction tank;
(2) adding an oxidant into the oxidation reaction tank through an oxidation dosing device, wherein the oxidant added by the oxidation dosing device is H2O2Adjusting the pH value to 4-7 by using a solution or ozone, sodium hypochlorite or potassium permanganate and the like, so that trivalent arsenic and trivalent antimony in the arsenic and antimony containing wastewater are oxidized into pentavalent arsenic and pentavalent antimony respectively;
(3) feeding the wastewater after oxidation treatment in the oxidation reaction tank into a chemical trapping tank, and adding a trapping agent into the chemical trapping tank through a trapping agent adding device to form complex precipitates of arsenic and antimony in the wastewater respectively; in the application, the trapping agent selects ferric salt and lime cream, and arsenic and antimony are removed from the wastewater by complexation while iron is precipitated through coprecipitation; in the link, the removal rate of arsenic and antimony can reach about 95 percent;
(4) the wastewater treated by the chemical capture pool is sent into a flocculation reaction pool, and then the flocculation reaction pool is stirred and the like, so that reaction products in the chemical capture pool are flocculated in the flocculation reaction pool to generate a flocculation mixture; in the step, the content of arsenic and antimony in the effluent can be reduced to 0.05 mg/L;
(5) sending the flocculated mixture in the flocculation reaction tank into a sedimentation tank, standing and separating to obtain a precipitate and a filtrate respectively; sending the precipitate into a sludge filter-pressing device, carrying out filter-pressing treatment to obtain filter-pressing sludge, sending the filter-pressing sludge into a sludge temporary storage device, and carrying out harmless treatment subsequently;
(6) the arsenic and antimony contents in the acidic filtrate obtained by the sedimentation tank reach relevant discharge standards, and the acidic filtrate can be recycled or discharged.
Example 1
The device is adopted to treat the arsenic-antimony-containing wastewater. The arsenic-antimony-containing wastewater to be treated comprises the following components: the arsenic content is 76mg/L, and the flow rate is 20L/h.
In this embodiment, the oxidant added by the oxidation dosing device is ferrous sulfate, and the adding concentration is 100 mg/L. The adding amount of the ferrous sulfate added by the trapping agent adding device is 20 mg/L; the dosage of the added lime milk is 50 mg/L.
The filtrate in the purified water recycling device is measured, and the measurement result is as follows: the arsenic content was 0.04 mg/L.
Example 2
The device is adopted to treat the arsenic-antimony-containing wastewater. The arsenic-antimony-containing wastewater to be treated comprises the following components: the arsenic content was 243mg/L and the flux was 30L/h.
In the embodiment, the oxidant added by the oxidation dosing device is hydrogen peroxide, the adding concentration of the hydrogen peroxide is 5% (mass ratio), and the using amount of the hydrogen peroxide is 500 ml/h. The iron salt added by the trapping agent adding device is ferric sulfate solution, the concentration is 10000mg/L, and the dosage is 1L/h; the dosage of the added lime milk is 100 mg/L.
The filtrate in the purified water recycling device is measured, and the measurement result is as follows: the arsenic content was 0.003 mg/L.
Example 3
The device is adopted to treat the arsenic-antimony-containing wastewater. The arsenic-antimony-containing wastewater to be treated comprises the following components: the antimony content was 14mg/L and the flow rate was 20L/h.
In this embodiment, the oxidant added by the oxidation dosing device is hydrogen peroxide, the concentration of which is 1%, and the dosage of which is 500 ml/L. Ferric salt added by the trapping agent adding device is ferric trichloride, and the adding amount is 30 mg/L; the dosage of the added lime milk is 200 mg/L.
The filtrate in the purified water recycling device is measured, and the measurement result is as follows: the content of antimony is 0.25 mg/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 (8)
1. The utility model provides a get rid of device of arsenic and antimony in waste water which characterized in that includes:
the waste water containing arsenic and antimony to be treated can be mixed with an oxidant in the oxidation reaction tank, and trivalent arsenic and trivalent antimony in the waste water containing arsenic and antimony are respectively oxidized into pentavalent arsenic and pentavalent antimony;
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 trivalent arsenic and trivalent antimony in the arsenic-antimony-containing wastewater in the oxidation reaction tank into pentavalent arsenic and pentavalent antimony respectively;
the chemical trapping pool is connected with the oxidation reaction pool, the wastewater after oxidation treatment in the oxidation reaction pool can enter the chemical trapping pool, and the arsenic and the antimony in the wastewater respectively form complex precipitates by the action of ferric salt and lime milk added into the chemical trapping pool and pentavalent arsenic and pentavalent antimony in the wastewater;
the trapping agent adding device is connected with the chemical trapping pool and is used for adding ferric salt and lime milk into the chemical trapping pool;
the flocculation reaction tank is connected with the chemical capture tank, and reaction products in the chemical capture tank can enter the flocculation reaction tank for flocculation and generate a flocculation mixture;
the sedimentation tank is connected with the flocculation reaction tank, and a flocculation mixture formed in the flocculation reaction tank can be subjected to standing sedimentation in the sedimentation 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;
the sludge temporary storage device is connected with the sludge filter-pressing device, and sludge generated by the sludge filter-pressing device can enter the sludge temporary storage device for temporary storage;
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, further comprising a pretreatment tank, wherein the pretreatment tank is connected with the oxidation reaction tank, and the arsenic-antimony-containing wastewater to be treated can enter the oxidation reaction tank after suspended matter impurities in the arsenic-antimony-containing wastewater are removed by the pretreatment tank.
3. The apparatus of claim 2, wherein the pretreatment tank is a suspended matter filtration tank.
4. The device of claim 1, wherein the oxidation dosing device is one of a hydrogen peroxide dosing device, an ozone dosing device, a sodium hypochlorite dosing device, and a potassium permanganate dosing device.
5. The apparatus of claim 1, wherein the collector addition apparatus comprises an iron salt addition apparatus, a lime milk addition apparatus.
6. The device of claim 1, wherein the clean water recycling device is a water storage tank.
7. The apparatus of claim 1, further comprising a first acid adding device, wherein the first acid adding device is connected with the oxidation reaction tank and can adjust the wastewater in the oxidation reaction tank to be weakly acidic.
8. The device according to claim 1, further comprising a precipitant adding device, wherein the precipitant adding device is connected to the flocculation reaction tank and can add a precipitant into the flocculation reaction tank to promote the flocculation reaction in the flocculation reaction tank.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114716063A (en) * | 2022-04-07 | 2022-07-08 | 锡矿山闪星锑业有限责任公司 | Treatment method of antimony-arsenic-containing wastewater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114716063A (en) * | 2022-04-07 | 2022-07-08 | 锡矿山闪星锑业有限责任公司 | Treatment method of antimony-arsenic-containing wastewater |
| CN114716063B (en) * | 2022-04-07 | 2024-01-26 | 锡矿山闪星锑业有限责任公司 | Treatment method of antimony-arsenic-containing wastewater |
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