CN214781255U - Device for recovering heavy metal chromium in tannery wastewater - Google Patents
Device for recovering heavy metal chromium in tannery wastewater Download PDFInfo
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- CN214781255U CN214781255U CN202121311195.3U CN202121311195U CN214781255U CN 214781255 U CN214781255 U CN 214781255U CN 202121311195 U CN202121311195 U CN 202121311195U CN 214781255 U CN214781255 U CN 214781255U
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- 239000002351 wastewater Substances 0.000 title claims abstract description 87
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000011651 chromium Substances 0.000 title claims abstract description 67
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 63
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 230000032683 aging Effects 0.000 claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 52
- 238000005868 electrolysis reaction Methods 0.000 claims description 46
- 229910052742 iron Inorganic materials 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910002804 graphite Inorganic materials 0.000 claims description 13
- 239000010439 graphite Substances 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 10
- 238000005273 aeration Methods 0.000 claims description 9
- ULFQGKXWKFZMLH-UHFFFAOYSA-N iridium tantalum Chemical compound [Ta].[Ir] ULFQGKXWKFZMLH-UHFFFAOYSA-N 0.000 claims description 6
- CJTCBBYSPFAVFL-UHFFFAOYSA-N iridium ruthenium Chemical compound [Ru].[Ir] CJTCBBYSPFAVFL-UHFFFAOYSA-N 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000004070 electrodeposition Methods 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 8
- 239000003814 drug Substances 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000009776 industrial production Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 20
- 238000009713 electroplating Methods 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 229910001430 chromium ion Inorganic materials 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001844 chromium Chemical class 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 230000001112 coagulating effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002920 hazardous waste Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- UOUJSJZBMCDAEU-UHFFFAOYSA-N chromium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+3].[Cr+3] UOUJSJZBMCDAEU-UHFFFAOYSA-N 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910001447 ferric ion Inorganic materials 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 1
- 229940001584 sodium metabisulfite Drugs 0.000 description 1
- 235000010262 sodium metabisulphite Nutrition 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
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- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The utility model provides a retrieve device of tanning waste water heavy metal chromium, the delivery port of the preliminary treatment groove of device passes through the pump and is connected with the water inlet of preliminary treatment pressure filter, the delivery port of preliminary treatment pressure filter is connected with the water inlet of groove in the middle of the preliminary treatment waste water, the delivery port of groove in the middle of the preliminary treatment waste water passes through the pump and is connected with electrolytic device's water inlet, electrolytic device's delivery port passes through the pump and is connected with the water inlet of ageing stirred tank, the delivery port of ageing stirred tank passes through the pump and is connected with the water inlet of final treatment pressure filter, the delivery port of final treatment pressure filter is connected with the water inlet of groove in the middle of the chromium-removing waste water. The utility model discloses the device chromium rate of recovery is high, and the dechromization waste water is up to standard, and the chroma of play water is low, and no secondary pollution, resource are recoverable, simple structure, and the medicament consumes fewly, and the energy consumption is little, and is with low costs, is suitable for industrial production.
Description
Technical Field
The utility model relates to a retrieve device of heavy metal, concretely relates to retrieve device of tanning waste water heavy metal chromium.
Background
The water consumption of the leather-making industrial wastewater is large, and generally, about 0.3-0.5 m of water is consumed for processing one pigskin per production3The water consumption of producing and processing one sheet of salt-wet cowhide is 1.0-1.5 m3The water consumption for producing and processing one sheepskin is 0.2-0.3 m3The water consumption of producing and processing one buffalo hide is 1.5-2.0 m3. According to different product varieties and green body types, 60-120 m of water is consumed for producing 1 ton of raw material skin3Belongs to a large waste water discharge household and relates to the pollution of heavy metal chromium, so the tanning industry becomes one of the industries for monitoring the pollution in a key way. With the strictness of environmental protection policies and the enhancement of environmental protection consciousness of the whole society, a plurality of mandatory measures are implemented by governments, and in the newly published and implemented pollutant emission standard for leather-making and fur processing industry GB30486-2013, the emission concentration of total chromium is required to be controlled below 1.5mg/L, which requires enterprises to strengthen the reasonable treatment of heavy metal chromium in leather-making wastewater and meet the environmental protection requirement. Therefore, the effective treatment of heavy metal chromium in chromium-containing wastewater is becoming one of the focus of the tanning enterprises at present.
The chromium content in the chromium-containing wastewater generated by tanning enterprises is usually 80-100 mg/L, the chromium mainly exists in the form of inorganic Cr (III), the pH value is 2.5-4.0, the chloride ion is 2-15 g/L, and the chroma (dilution multiple method) is 800-3500 times. At present, the low-concentration chrome-containing tannery wastewater is mostly treated by an alkali-adding coagulating sedimentation method, chromium is deeply removed by adding alkali and a coagulant into the wastewater, and the common coagulant comprises ferrous sulfate, aluminum sulfate, PAC, PFC and the like; the alkali-adding coagulating sedimentation method is simple to operate, but chromium removal is incomplete, and the discharge requirement of 1.5mg/L is difficult to achieve. Meanwhile, a large amount of chromium-containing sludge is generated, and the chromium-containing sludge belongs to hazardous waste and is difficult to treat harmlessly.
CN102381781A discloses a process for recovering chromium in tannery chrome tanning wastewater, which is to effectively divide and separately collect the tannery chrome tanning wastewater, wherein the process comprises primary filtration by adopting a 1-3 mm grid, secondary filtration by adopting a filter press, reaction under the pH value of a controlled temperature and tertiary filtration by using the filter press again, the content of dichromium trioxide in the obtained filter residue, namely chrome mud, is more than 8wt%, and the total chromium content of filtrate and discharged wastewater is less than or equal to 1.5mg/L calculated by Cr. However, although the chromium removal effect reaches the discharge standard, the chromium slag is obtained, the impurities are more, the chromium oxide content is low, the chromium slag is solid hazardous waste and is inconvenient to use, and secondary pollution is easily caused because the chromium mud is stacked in the environment and has certain solubility; in addition, the chromium content is within the range of 80-100 mg/L, the chromium content in the produced slag is lower, the recovery is more difficult, and the value is lower.
CN101549925A discloses a method for recycling hexavalent chromium in electroplating chromium wastewater through electrolysis, which comprises the following steps: sequentially adding a sulfuric acid solution, sodium metabisulfite and a sodium carbonate solution into the chromium electroplating wastewater; the reacted chromium-electroplating wastewater flows into a precipitator for precipitation; precipitating, allowing the supernatant to flow into a neutralization tank for neutralization, inputting the chromium-electroplating wastewater into a filter press for filter pressing, and washing the obtained trivalent chromium salt with clear water; adding the electro-chromic waste water, trivalent chromium salt and sulfuric acid into an electrolytic bath of a concentration purifier, and adding the sulfuric acid into a porous tank of the concentration purifier; when the concentration of hexavalent chromium and the concentration of trivalent chromium in the chromium-electroplating wastewater electrolyzed in the electrolytic tank of the concentration purifier are more than 20g/L and less than 1g/L, the chromium-electroplating wastewater can be used as a supplementing solution for the chromium electroplating. Although the method enables hexavalent chromium to be recovered from the chromium electroplating wastewater by electrolysis, there are disadvantages in that: the process is complex, the flow is long, the types and the amount of added medicaments are large, more importantly, as trivalent chromium is a cation, when direct current is supplied for electrolysis, under normal conditions, trivalent chromium ions (cations) move to the vicinity of a cathode, the probability of moving to an anode is low, only the trivalent chromium ions near the anode can lose 3 electrons to become hexavalent chromium ions, and therefore, the efficiency of converting the trivalent chromium into the hexavalent chromium by an electrolysis mode is low, therefore, the method has the defects of long electrolysis time, high cost and limited large-scale industrial use in practical use.
CN103922521A discloses a method for chrome tanning wastewater treatment and chrome recovery, which comprises the steps of pretreatment, pH adjustment, electric flocculation treatment, aeration precipitation treatment, sludge reaction tank treatment, electrocatalytic oxidation treatment and the like, wherein the chromium in the wastewater is recovered. However, the method has the defects of long flow, more medicament addition, low electrocatalytic oxidation efficiency and the like, and is particularly suitable for chromium-containing wastewater with higher chromium content (for example, the chromium content in the embodiment reaches 2500 mg/L), and has poor effect when the chromium content in the wastewater is low.
CN103695970A discloses a method for treating chrome-containing tanning wastewater and recovering metal chrome, which comprises the steps of simply pretreating the tanning wastewater to remove solid impurities; adding urea, boric acid and methanol into the waste water from which impurities are removed, and adjusting the pH value; then electrifying to electrolyze to obtain the metallic chromium. However, the method is suitable for recovering chromium from wastewater with high chromium content, wherein the Cr is normally in the wastewater3+The electrolysis conditions generally require Cr in the electrolyte3+The concentration is 95-105 g/L, under the condition, the direct current power consumption is 11000-18500 kW.h/tCr, however, the chromium content in the chrome-containing tanning wastewater is generally not high, especially the wastewater with the chromium content of less than 100mg/L is difficult to achieve the condition of normal electrolysis of trivalent chromium, and if the electrolysis method is used for treating the low-content chromium wastewater to prepare metal chromium, the direct current power consumption is higher, so that the method is not economical.
In summary, a device for recovering heavy metal chromium from tannery wastewater, which has the advantages of high chromium recovery rate, standard chromium-removing wastewater, low effluent chromaticity, no secondary pollution, recoverable resources, simple structure, less medicament consumption, low energy consumption, low cost and suitability for industrial production, is urgently needed to be found.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that, overcome the above-mentioned defect that prior art exists, provide a chromium rate of recovery high, it is up to standard to remove chromium waste water, and the chromaticity of water is low, and no secondary pollution, resource recovery, simple structure, the medicament consumes fewly, and the energy consumption is little, and is with low costs, is suitable for the device of industrial production's recovery tannery waste water heavy metal chromium.
The utility model provides a technical scheme that its technical problem adopted as follows: the utility model provides a retrieve device of tanning waste water heavy metal chromium, the delivery port of preliminary treatment groove is passed through the pump and is connected with the water inlet of preliminary treatment pressure filter, the delivery port of preliminary treatment pressure filter is connected with the water inlet of preliminary treatment waste water intermediate tank, the delivery port of preliminary treatment waste water intermediate tank passes through the pump and is connected with electrolytic device's water inlet, electrolytic device's delivery port passes through the pump and is connected with the water inlet of ageing stirred tank, the delivery port of ageing stirred tank passes through the pump and is connected with the water inlet of final treatment pressure filter, the delivery port of final treatment pressure filter is connected with the water inlet of chromium-removing waste water intermediate tank.
The utility model discloses the working process of device is: firstly, the tannery wastewater is pretreated in a pretreatment tank, mechanical impurities are discharged after the tannery wastewater is subjected to filter pressing by a pretreatment filter press, the pretreated wastewater is stored in a pretreated wastewater intermediate tank, the pretreated wastewater enters an electrolysis device for electrolysis, the electrolysis wastewater is aged in an aging stirring tank, finally, after the pretreated wastewater is subjected to filter pressing by a final treatment filter press, chromium-containing ferrite is discharged, and chromium-removing wastewater is stored in a chromium-removing wastewater intermediate tank.
Preferably, the electrolysis device is a tank electrolysis device or a cyclone electrodeposition device.
Preferably, the anode and the cathode of the electrolysis device can be replaced by inert electrodes or iron plates, or the electrolysis device is formed by connecting three electrolysis baths with the anode, the inert electrode and the iron plate in series. When both the anode and the cathode of the electrolysis device can be replaced, for example, the anode is replaced by an inert electrode, an iron plate and an inert electrode, and the cathode is replaced by an iron plate, an inert electrode and an iron plate. When the electrolysis device is formed by connecting three electrolysis baths in series, the wastewater sequentially enters the three electrolysis baths in series for electrolysis.
The working principle of the electrolysis device is as follows: firstly, an inert anode is used for electrolysis to generate a certain amount of oxidant in the wastewater, then an iron plate anode is used for electrolysis to generate a certain amount of ferrous ions in the wastewater, and finally, the inert anode is used for electrolysis to further generate the oxidant in the wastewater, so that the ferric ions in the wastewater and the chromium ions in the wastewater generate ferrite.
Preferably, the cathode of the electrolysis device is an iron plate or an inert electrode.
Preferably, the inert electrode is made of graphite, iridium tantalum or ruthenium iridium.
Preferably, the bottom of the electrolysis device is provided with an aeration device. The aeration device mainly ensures that the ferrite is generated more quickly.
Preferably, the aeration device is a hot air aeration device.
Preferably, stirring devices are arranged in the pretreatment tank and the aging stirring tank. The pretreatment tank is provided for the purpose of adjusting the pH value of the wastewater and the chloride ion content in the wastewater. The purpose of the aging agitator tank was to further stabilize the formation of ferrite.
Preferably, the material of the pretreatment tank and the aging and stirring tank is plastic or corrosion-resistant stainless steel.
Preferably, the pretreatment tank is also provided with a water inlet.
Preferably, the pre-treatment filter press and the final treatment filter press are plate filter presses or membrane filter presses.
Preferably, the pretreatment filter press and the final treatment filter press are both provided with discharge ports.
Preferably, a water outlet is further formed in the chromium-removing wastewater intermediate tank.
The utility model has the advantages as follows: the utility model discloses the device chromium rate of recovery is high, and the dechromization waste water is up to standard, is less than GB30486-2013 emission standard far away (below the emission concentration 1.5mg/L of total chromium), and the chromaticity of water is low, no secondary pollution, and the resource is recoverable, simple structure, and the medicament consumes fewly, and the energy consumption is little, and is with low costs, is suitable for industrial production.
Drawings
FIG. 1 is a schematic view of a device for recovering heavy metal chromium from tannery wastewater in embodiments 1 and 2 of the present invention.
Detailed Description
The present invention will be further explained with reference to the following examples and drawings.
Embodiment 1 of device for recovering heavy metal chromium in tannery wastewater
As shown in figure 1, a water outlet 1-2 of a pretreatment tank 1 is connected with a water inlet 3-1 of a pretreatment membrane filter press 3 through a pump 2, the water outlet 3-2 of the pretreatment membrane filter press 3 is connected with the water inlet 4-1 of the pretreatment waste water intermediate tank 4, a water outlet 4-2 of the pretreated wastewater intermediate tank 4 is connected with a water inlet 5-1 of a tank type electrolytic device 5 through a pump 2, a water outlet 5-2 of the groove type electrolytic device 5 is connected with a water inlet 6-1 of the aging and stirring groove 6 through a pump 2, a water outlet 6-2 of the aging and stirring tank 6 is connected with a water inlet 7-1 of a final treatment membrane filter press 7 through a pump 2, a water outlet 7-2 of the final treatment membrane filter press 7 is connected with a water inlet 8-1 of a chromium-removing wastewater intermediate tank 8; the anode of the tank type electrolytic device 5 can be replaced by a graphite electrode or an iron plate, and the cathode can be replaced by an iron plate or a graphite electrode; the bottom of the groove type electrolytic device 5 is provided with a hot air aeration device 5-3; stirring devices 1-3 and 6-3 are arranged in the pretreatment tank 1 and the aging stirring tank 6; the pretreatment tank 1 and the aging and stirring tank 6 are made of corrosion-resistant stainless steel; the pretreatment tank 1 is also provided with a water inlet 1-1; the pretreatment membrane filter press 3 and the final treatment membrane filter press 7 are respectively provided with a discharge port 3-3 and a discharge port 7-3; a water outlet 8-2 is also arranged on the chromium-removing waste water intermediate tank 8.
The utility model discloses the working process of device is: the method comprises the steps of pretreating the tannery wastewater in a pretreatment tank 1, performing filter pressing 3 by a pretreatment membrane filter press, discharging mechanical impurities, storing the pretreated wastewater in a pretreatment wastewater intermediate tank 4, feeding the pretreated wastewater into a tank type electrolysis device 5, replacing an anode by a graphite electrode, an iron plate and a graphite electrode in sequence according to the electrolysis operation requirement, replacing a cathode by an iron plate, a graphite electrode and an iron plate in sequence, performing electrolysis, aging the electrolysis wastewater in an aging stirring tank 6, performing filter pressing by a final treatment membrane filter press 7, discharging chromium-containing ferrite, and storing the chromium-removing wastewater in a chromium-removing wastewater intermediate tank 8.
The utility model discloses the device only lies in with embodiment 1's difference: the anode of the tank type electrolytic device 5 can be replaced by an iridium tantalum electrode, a graphite electrode or an iron plate, and the cathode can be replaced by an iron plate or a graphite electrode. The same as in example 1.
The utility model discloses the working process of device only lies in with embodiment 1's difference: according to the requirements of electrolysis operation, the anode is replaced by an iridium tantalum electrode, an iron plate and a graphite electrode, and the cathode is replaced by an iron plate, a graphite electrode and an iron plate. The same as in example 1.
The utility model discloses the device only lies in with embodiment 1's difference: the tank type electrolysis device is formed by connecting three electrolysis tanks in series, wherein the anodes of the electrolysis tanks are an iridium tantalum electrode, an iron plate and a graphite electrode in sequence, and the cathodes of the electrolysis tanks are an iron plate, an iridium tantalum electrode and an iron plate in sequence. The same as in example 1.
The utility model discloses the working process of device only lies in with embodiment 1's difference: the pretreated wastewater sequentially enters a tank type electrolytic device formed by connecting three electrolytic tanks in series for electrolysis. The same as in example 1.
The utility model discloses the device only lies in with embodiment 3's difference: the tank type electrolytic device is formed by connecting three electrolytic tanks in series, wherein the anodes of the electrolytic tanks are a ruthenium iridium electrode, an iron plate and a ruthenium iridium electrode in sequence, and the cathodes of the electrolytic tanks are an iron plate, a graphite electrode and an iron plate in sequence. The same as in example 3.
The working process of the device of the utility model is the same as that of the embodiment 3.
Claims (3)
1. The utility model provides a retrieve device of tannery waste water heavy metal chromium which characterized in that: the water outlet of the pretreatment tank is connected with the water inlet of the pretreatment filter press through a pump, the water outlet of the pretreatment filter press is connected with the water inlet of the pretreatment wastewater intermediate tank, the water outlet of the pretreatment wastewater intermediate tank is connected with the water inlet of the electrolysis device through a pump, the water outlet of the electrolysis device is connected with the water inlet of the aging stirring tank through a pump, the water outlet of the aging stirring tank is connected with the water inlet of the final treatment filter press through a pump, and the water outlet of the final treatment filter press is connected with the water inlet of the chromium-removing wastewater intermediate tank.
2. The device for recovering the heavy metal chromium in the tannery wastewater according to claim 1, which is characterized in that: the electrolysis device is a groove type electrolysis device or rotational flow electrodeposition equipment; the anode and the cathode of the electrolysis device can be replaced by inert electrodes or iron plates, or the electrolysis device is formed by connecting three electrolysis baths of which the anodes are the inert electrodes, the iron plates and the inert electrodes in sequence; the cathode of the electrolysis device is an iron plate or an inert electrode; the inert electrode is made of graphite, iridium tantalum or ruthenium iridium; an aeration device is arranged at the bottom of the electrolysis device; the aeration device is a hot air aeration device.
3. The apparatus for recovering heavy metal chromium in tannery wastewater according to claim 1 or 2, characterized in that: stirring devices are arranged in the pretreatment tank and the aging and stirring tank; the pretreatment tank and the aging and stirring tank are made of plastics or corrosion-resistant stainless steel; the pretreatment tank is also provided with a water inlet; the pretreatment filter press and the final treatment filter press are plate filter presses or membrane filter presses; the pretreatment filter press and the final treatment filter press are both provided with a discharge hole; and a water outlet is also formed in the chromium-removing waste water intermediate tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121311195.3U CN214781255U (en) | 2021-06-11 | 2021-06-11 | Device for recovering heavy metal chromium in tannery wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121311195.3U CN214781255U (en) | 2021-06-11 | 2021-06-11 | Device for recovering heavy metal chromium in tannery wastewater |
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| Publication Number | Publication Date |
|---|---|
| CN214781255U true CN214781255U (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121311195.3U Active CN214781255U (en) | 2021-06-11 | 2021-06-11 | Device for recovering heavy metal chromium in tannery wastewater |
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| Country | Link |
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| CN (1) | CN214781255U (en) |
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2021
- 2021-06-11 CN CN202121311195.3U patent/CN214781255U/en active Active
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