CN116606018A - Copper-containing wastewater treatment method - Google Patents
Copper-containing wastewater treatment method Download PDFInfo
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- CN116606018A CN116606018A CN202310657078.XA CN202310657078A CN116606018A CN 116606018 A CN116606018 A CN 116606018A CN 202310657078 A CN202310657078 A CN 202310657078A CN 116606018 A CN116606018 A CN 116606018A
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- copper
- containing wastewater
- wastewater
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 208
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 202
- 239000010949 copper Substances 0.000 title claims abstract description 202
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 9
- 239000002351 wastewater Substances 0.000 claims abstract description 213
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003513 alkali Substances 0.000 claims abstract description 45
- 229910001431 copper ion Inorganic materials 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 32
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 23
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 23
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 23
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 18
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 239000007787 solid Substances 0.000 claims abstract description 13
- 210000003462 vein Anatomy 0.000 claims abstract description 12
- 239000002516 radical scavenger Substances 0.000 claims abstract description 11
- 239000011889 copper foil Substances 0.000 claims abstract description 6
- 230000001376 precipitating effect Effects 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 16
- 238000006386 neutralization reaction Methods 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 13
- 239000000701 coagulant Substances 0.000 claims description 8
- 238000004062 sedimentation Methods 0.000 claims description 8
- 239000012670 alkaline solution Substances 0.000 claims description 5
- 239000003814 drug Substances 0.000 claims description 5
- 239000008394 flocculating agent Substances 0.000 claims description 5
- 239000013049 sediment Substances 0.000 claims description 5
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 5
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005189 flocculation Methods 0.000 claims description 3
- 230000016615 flocculation Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 7
- 238000009713 electroplating Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- -1 hydroxide ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The application discloses a method for treating copper-containing wastewater, which relates to the technical field of copper foil wastewater treatment, and specifically comprises the following steps: adding a first alkali liquor into the copper-containing wastewater, and increasing the pH value of the copper-containing wastewater to a first pH value; adding ferrous sulfate into the copper-containing wastewater, and carrying out first-time vein breaking on complex copper in the copper-containing wastewater; continuously adding a second alkali liquor into the copper-containing wastewater, and increasing the pH value of the copper-containing wastewater to a second pH value; continuously adding a heavy metal scavenger into the copper-containing wastewater, and carrying out secondary decomplexing on the complex copper in the copper-containing wastewater; precipitating copper ions in the copper-containing wastewater; separating out solid impurities in the copper-containing wastewater, and filtering the copper-containing wastewater; wherein the first pH value is less than 7, and the second pH value is greater than 7. By the method, the aim of rapidly and effectively removing copper ions can be fulfilled.
Description
Technical Field
The application relates to the field of copper foil wastewater treatment processes, in particular to a copper-containing wastewater treatment method.
Background
A large amount of copper-containing electroplating wastewater is generated in the copper foil production, and the copper-containing wastewater is harmful to people and the environment if directly discharged, so that copper ions in the wastewater are required to be removed by precipitation, and the copper ion content in the wastewater reaches the standard to reach the discharge standard.
When the pH value of the single copper-containing wastewater is 6.92, copper ions can be removed by precipitation to reach the standard, and when copper and iron in common electroplating wastewater coexist, the pH value is controlled to be 8-9, so that the wastewater can reach the discharge standard. However, for mixed electroplating wastewater containing copper and other heavy metals and complexes, the copper removal effect is poor, and the emission standard is often not met, mainly because the treatment essence of the method is to adjust the pH value of the wastewater, and the pH values of the optimal precipitates of various metals are different, so that the removal effect is poor. If the wastewater contains complex ions such as cyanide, ammonium and the like, the complex ions form a complex with copper ions, and the copper ions are not easy to dissociate, so that the copper ions are difficult to reach the emission standard.
Disclosure of Invention
The application aims to provide a treatment method of copper-containing wastewater, which can effectively remove copper ions in the copper-containing wastewater so that the copper-containing wastewater reaches the discharge standard.
The application discloses a method for treating copper-containing wastewater, which specifically comprises the following steps:
adding a first alkali liquor into the copper-containing wastewater, and increasing the pH value of the copper-containing wastewater to a first pH value;
adding ferrous sulfate into the copper-containing wastewater, and carrying out first-time vein breaking on complex copper in the copper-containing wastewater;
continuously adding a second alkali liquor into the copper-containing wastewater, and increasing the pH value of the copper-containing wastewater to a second pH value;
continuously adding a heavy metal scavenger into the copper-containing wastewater, and carrying out secondary decomplexing on the complex copper in the copper-containing wastewater;
precipitating copper ions in the copper-containing wastewater; and
separating out solid impurities in the copper-containing wastewater, and filtering the copper-containing wastewater;
wherein the first pH value is less than 7, and the second pH value is greater than 7.
Optionally, the first PH is 4-5, and the second PH is 9-9.5.
Optionally, the first alkali liquor comprises sodium hydroxide, and the second alkali liquor comprises sodium hydroxide; adding a first alkali liquor into copper-containing wastewater, and adding the first alkali liquor into a wastewater pool in the step of increasing the pH value of the copper-containing wastewater to a first pH value; and adding ferrous sulfate into the copper-containing wastewater, wherein the ferrous sulfate is added into the wastewater pool in the step of carrying out first vein breaking on the complex copper in the copper-containing wastewater.
Optionally, the copper-containing wastewater is stirred while the primary alkali solution and the ferrous sulfate are added.
Optionally, continuously adding a second alkali liquor into the copper-containing wastewater, and increasing the pH value of the copper-containing wastewater to a second pH value, wherein the step of increasing the pH value of the copper-containing wastewater to the second pH value comprises the following steps:
introducing the copper-containing wastewater into a neutralization reaction tank through a lifting pump;
opening a medicine pump to introduce second alkali liquor into the neutralization reaction tank;
wherein the concentration of sodium hydroxide in the second alkali liquor is greater than the concentration of sodium hydroxide in the first alkali liquor.
Optionally, the step of precipitating copper ions in the copper-containing wastewater includes the steps of:
adding a flocculating agent into the neutralization reaction tank, and treating the copper-containing wastewater by using a flocculation reactor; and
coagulant aid is added into the neutralization reaction tank, and a coagulant aid reactor is used for treating the copper-containing wastewater.
Optionally, the step of separating out solid impurities in the copper-containing wastewater and filtering the copper-containing wastewater includes:
introducing the copper-containing wastewater into a sedimentation tank from the neutralization reaction tank, and filtering out sediment at the bottom of the copper-containing wastewater;
introducing sulfuric acid into the sedimentation tank to adjust the pH value of the copper-containing wastewater;
treating the copper-containing wastewater by using an air floatation machine, and separating out solid impurities in the copper-containing wastewater; and
and filtering the copper-containing wastewater by using a bag filter.
Optionally, after the step of separating out solid impurities in the copper-containing wastewater and filtering the copper-containing wastewater, the method comprises the steps of:
detecting the concentration of copper ions in the filtered wastewater; and
when the concentration of copper ions in the wastewater is greater than a threshold value, introducing the wastewater into the wastewater pool; and discharging the wastewater when the concentration of copper ions in the wastewater is less than a threshold value.
Optionally, a heavy metal scavenger is continuously added into the copper-containing wastewater, and in the step of carrying out secondary vein breaking on the complex copper in the copper-containing wastewater, the heavy metal scavenger comprises sodium sulfide.
Optionally, the copper-containing wastewater is wastewater in copper foil production.
Because the initial PH value of the copper-containing wastewater is lower, the application pulls the PH value of the copper-containing wastewater to the first PH value by adding alkali for coarse adjustment, reduces monovalent copper ions to divalent copper ions by adding ferrous sulfate for the subsequent operation, thereby realizing the first time of vein breaking, and also makes a bedding for the subsequent operation of increasing the PH value of the copper-containing wastewater to the second PH value, so that the PH value of the copper-containing wastewater can be pulled to the second PH value for the subsequent operation, further the heavy metal scavenger breaks the chemical bonds of residual complex copper, separates copper ions, completes the second time of vein breaking, and achieves the purpose of rapidly and effectively removing copper ions.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is evident that the figures in the following description are only some embodiments of the application, from which other figures can be obtained without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a flow chart of a method for treating copper-containing wastewater provided by an embodiment of the application;
fig. 2 is a flow chart of a more specific method for treating copper-containing wastewater according to an embodiment of the present application.
Detailed Description
It is to be understood that the terminology used herein, the specific structural and functional details disclosed are merely representative for the purpose of describing particular embodiments, but that the application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
As shown in fig. 1, the embodiment of the application provides a method for treating copper-containing wastewater, wherein the copper-containing wastewater is based on an electroplating solution generated in a copper foil production process, and even further comprises solutions such as membrane system constant drainage, equipment flushing water, ED fresh water, acid mist purification tower drainage and the like, and the copper-containing wastewater contains substances such as copper ions, sulfuric acid, complex copper and the like, and the method specifically comprises the following steps:
s1: adding a first alkali liquor into the copper-containing wastewater, and increasing the pH value of the copper-containing wastewater to a first pH value;
s2: adding ferrous sulfate into the copper-containing wastewater, and carrying out first-time vein breaking on complex copper in the copper-containing wastewater;
s3: continuously adding a second alkali liquor into the copper-containing wastewater, and increasing the pH value of the copper-containing wastewater to a second pH value;
s4: continuously adding a heavy metal scavenger into the copper-containing wastewater, and carrying out secondary decomplexing on the complex copper in the copper-containing wastewater;
s5: precipitating copper ions in the copper-containing wastewater;
s6: separating out solid impurities in the copper-containing wastewater, and filtering the copper-containing wastewater;
wherein the first pH value is less than 7, and the second pH value is greater than 7.
Because the initial PH value of the copper-containing wastewater is lower, the application pulls the PH value of the copper-containing wastewater to a first PH value by adding alkali for coarse adjustment, reduces monovalent copper ions to divalent copper ions for the subsequent addition of ferrous sulfate, and further realizes the first-time vein breaking and provides a PH value environment; since ferrous sulfate requires the reduction of monovalent copper ions to divalent copper ions under acidic conditions, the ph of copper-containing wastewater cannot be adjusted to an alkaline solution prior to the addition of ferrous sulfate.
Moreover, the copper-containing wastewater is subjected to coarse adjustment by adding alkali, and a bedding is made for subsequently increasing the pH value of the copper-containing wastewater to a second pH value, so that the pH value of the copper-containing wastewater can be rapidly pulled to the second pH value in the subsequent process; if the step of adding alkali for coarse adjustment of the copper-containing wastewater is not carried out, the initial copper-containing wastewater is directly added with alkali to enable the pH value of the copper-containing wastewater to be increased to the second pH value, so that part of alkali liquor is consumed by ferrous sulfate and reactants of the ferrous sulfate which are added by first breaking, and the alkali liquor is added into the copper-containing wastewater, and time is required for full mixing and reaction, so that the pH value cannot be increased rapidly, and more alkali liquor is consumed if the pH value of the copper-containing wastewater is required to be increased to the second pH value. And if the initial PH of the copper-containing wastewater is too low, the PH of the copper-containing wastewater is not sufficiently pulled to high by the dosing pump alone during the reaction, and the optimal precipitation conditions are not achieved. The embodiment of the application can coarsely adjust the pH value of the copper-containing wastewater by adding alkali, so that the pH value of the copper-containing wastewater is not too low, and the pH value of the copper-containing wastewater can be rapidly pulled to a higher alkalinity degree by directly passing through a drug pump in the follow-up process, thereby meeting the use requirement.
According to the application, ferrous sulfate and a heavy metal scavenger are added separately, the price of copper ions is changed, the chemical bond of complex copper is destroyed, and the complex is broken from two different aspects, so that the degree of complex breaking is improved, and the content of complex copper in copper-containing wastewater is reduced to the minimum; and in between the first broken collaterals and the second broken collaterals, the pH value of the copper-containing wastewater is increased to a second pH value by adding a second alkali liquor, and the copper-containing wastewater is adjusted to an alkaline solution, so that a part of copper ions after the first broken collaterals are precipitated, and a part of copper ions can be precipitated again in the alkaline copper-containing wastewater after the second broken collaterals, and in the process, the copper ions can be continuously precipitated, so that the total precipitation time is reduced. Therefore, the application can achieve the purpose of rapidly and effectively removing copper ions.
Through tests, the wastewater treatment process adopting one channel breaking flow generally takes 20-30min, and the application adopts two channel breaking flows, but the whole process only takes 15-20min, thereby being beneficial to improving the wastewater treatment efficiency.
Wherein the first PH value is 4-5, and the second PH value is 9-9.5. The inventor researches find that when the PH value of the copper-containing wastewater is adjusted to 4-5 through the first alkali liquor in the step S1, the PH value of the copper-containing wastewater in the step S3 can be quickly adjusted to 9-9.5, so that the whole process time can be reduced to the minimum. And the second PH value is 9-9.5, so that copper ions can be precipitated faster, and a better environment can be provided for the second vein breaking.
Specifically, in the step S1, the copper-containing wastewater is initially introduced into a wastewater pool, a first alkali solution, namely a sodium hydroxide solution, is added through a drug pump, the pH value of the copper-containing wastewater is increased to 4-5, and the pH value of the copper-containing wastewater is directly detected by a pH test strip.
In the step S2, after the pH value of the copper-containing wastewater is increased to 4-5, ferrous sulfate solution is directly added into a wastewater pool of the copper-containing wastewater, and a part of complex copper is broken. In the steps S1 and S2, the first alkali liquor and the ferrous sulfate are added, and meanwhile, the copper-containing wastewater is stirred, so that the first alkali liquor and the ferrous sulfate solution are quickly and uniformly mixed with the copper-containing wastewater, and the reaction time is shortened.
Next, as shown in fig. 2, in step S3, the method specifically includes the following steps:
s31: introducing the copper-containing wastewater into a neutralization reaction tank through a lifting pump;
s32: and opening the medicine pump to introduce the second alkali liquor into the neutralization reaction tank.
In the step S31, in the process of transferring the copper-containing wastewater from the wastewater tank to the neutralization reaction tank, the mixing effect of ferrous sulfate and the copper-containing wastewater is further improved; after the ferrous sulfate is added, the step S3 is directly carried out, and the mixing and the reaction of the ferrous sulfate and the copper-containing wastewater do not need to be waited, so that the whole process time is further shortened. In the step S32, the second alkali liquor and the first alkali liquor are also sodium hydroxide solution, so that the feeding is convenient, and the components in the copper-containing wastewater can be reduced.
Furthermore, the concentration of sodium hydroxide in the second alkali liquor is larger than that of sodium hydroxide in the first alkali liquor, so that the PH value of the copper-containing wastewater can be quickly raised, and sufficient hydroxide ions can be quickly provided to react with copper ions generated by first vein breaking to combine and precipitate.
Next, in step S4, the heavy metal scavenger is sodium sulfide, and since sodium sulfide is also alkaline, it is easier to pull the PH of the copper-containing wastewater to above 9. In addition, sodium sulfide and sodium hydroxide are sodium ions, namely, the heavy metal capturing agent, the first alkali liquor and the cations in the second alkali liquor are the same components, so that more diversity of the components in the copper-containing wastewater can be further avoided, and the same components are easy to uniformly treat in the subsequent treatment.
Then, in step S5, specifically including:
s51: adding a flocculating agent into the neutralization reaction tank, and treating the copper-containing wastewater by using a flocculation reactor;
s52: coagulant aid is added into the neutralization reaction tank, and a coagulant aid reactor is used for treating the copper-containing wastewater.
At present, in wastewater treatment, solid-liquid separation can be realized by adding a flocculating agent, and the flocculating agent can coagulate particles containing copper ions into aggregates, so that a separation effect is achieved. In the embodiment of the application, the coagulant aid is further added after the flocculant is added, so that the coagulation effect of the flocculant is improved, and the removal effect of copper ions is further improved. Wherein the flocculant may be polyaluminum chloride (PAC) and the coagulant aid may be Polyacrylamide (PAM).
Further, in the step S6, the step of:
s61: introducing the copper-containing wastewater into a sedimentation tank from the neutralization reaction tank, and filtering out sediment at the bottom of the copper-containing wastewater;
s62: introducing sulfuric acid into the sedimentation tank to adjust the pH value of the copper-containing wastewater;
s63: treating the copper-containing wastewater by using an air floatation machine, and separating out solid impurities in the copper-containing wastewater;
s64: and filtering the copper-containing wastewater by using a bag filter.
In step S62, the PH of the copper-containing wastewater is adjusted to neutral by automatic addition of sulfuric acid, so that the discharge requirement is met. And before sulfuric acid is introduced into the copper-containing wastewater, the S61 operation step is carried out, the sediment at the bottom of the sedimentation tank is conveyed to a membrane filter press through a sludge pump, the sediment in the copper-containing wastewater is filtered out, a filter cake is formed and is sent out, and the rest filtrate is introduced into the wastewater tank for continuous filtration, so that the removal rate of copper ions is improved. And the step of conveying the copper-containing wastewater in the sedimentation tank to the membrane filter press through the sludge pump is to avoid the problem that the pH value of the copper-containing wastewater is further reduced due to the fact that sulfuric acid is mixed into the copper-containing wastewater and filtered and returned to the wastewater tank before the step of introducing sulfuric acid into the copper-containing wastewater, thereby being beneficial to reducing the loss of alkali liquor.
In the step S63, air is attached to suspended particles of copper-containing components in the form of highly dispersed micro bubbles by an air floatation machine, so that small particles originally suspended in the middle of copper-containing wastewater are gathered and float above the solution, and sewage discharge filtration is facilitated. After the copper-containing wastewater is treated by the air floatation machine, the copper-containing wastewater is temporarily stored in a discharge water tank and is discharged into a bag filter for filtering by an outer discharge lifting pump, wherein solid impurities are collected in the bag filter, and the time is not required to finish the solid impurities.
Then, after step S64, there is also the step of:
s7: detecting the concentration of copper ions in the filtered wastewater;
s8: when the concentration of copper ions in the wastewater is greater than a threshold value, introducing the wastewater into the wastewater pool; and discharging the wastewater when the concentration of copper ions in the wastewater is less than a threshold value.
The copper ion filtration can be completed in a short time by the method for treating the copper-containing wastewater, the copper ion removal rate in the copper-containing wastewater reaches more than 98%, and compared with the current copper ion removal effect, the method for treating the copper-containing wastewater is greatly improved, and the influence on the environment and people can be effectively reduced.
It should be noted that, the limitation of each step in the present solution is not to be considered as limiting the sequence of steps on the premise of not affecting the implementation of the specific solution, and the steps written in the previous step may be executed before, or executed after, or even executed simultaneously, so long as the implementation of the present solution is possible, all the steps should be considered as falling within the protection scope of the present application.
The above description of the application in connection with specific alternative embodiments is further detailed and it is not intended that the application be limited to the specific embodiments disclosed. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the application, and these should be considered to be within the scope of the application.
Claims (10)
1. The copper-containing wastewater treatment method is characterized by comprising the following steps:
adding a first alkali liquor into the copper-containing wastewater, and increasing the pH value of the copper-containing wastewater to a first pH value;
adding ferrous sulfate into the copper-containing wastewater, and carrying out first-time vein breaking on complex copper in the copper-containing wastewater;
continuously adding a second alkali liquor into the copper-containing wastewater, and increasing the pH value of the copper-containing wastewater to a second pH value;
continuously adding a heavy metal scavenger into the copper-containing wastewater, and carrying out secondary decomplexing on the complex copper in the copper-containing wastewater;
precipitating copper ions in the copper-containing wastewater; and
separating out solid impurities in the copper-containing wastewater, and filtering the copper-containing wastewater;
wherein the first pH value is less than 7, and the second pH value is greater than 7.
2. The method for treating copper-containing wastewater as recited in claim 1, wherein the first PH is 4 to 5 and the second PH is 9 to 9.5.
3. The method for treating copper-containing wastewater according to claim 1, wherein the first alkaline solution comprises sodium hydroxide and the second alkaline solution comprises sodium hydroxide;
adding a first alkali liquor into copper-containing wastewater, and adding the first alkali liquor into a wastewater pool in the step of increasing the pH value of the copper-containing wastewater to a first pH value;
and adding ferrous sulfate into the copper-containing wastewater, wherein the ferrous sulfate is added into the wastewater pool in the step of carrying out first vein breaking on the complex copper in the copper-containing wastewater.
4. The method for treating copper-containing wastewater as recited in claim 3, wherein said copper-containing wastewater is stirred while said primary alkali solution and said ferrous sulfate are added.
5. The method for treating copper-containing wastewater as recited in claim 3, wherein the step of continuously adding a second alkaline solution to the copper-containing wastewater to increase the PH of the copper-containing wastewater to a second PH value comprises the steps of:
introducing the copper-containing wastewater into a neutralization reaction tank through a lifting pump;
opening a medicine pump to introduce second alkali liquor into the neutralization reaction tank;
wherein the concentration of sodium hydroxide in the second alkali liquor is greater than the concentration of sodium hydroxide in the first alkali liquor.
6. The method for treating copper-containing wastewater according to claim 5, wherein the step of precipitating copper ions in the copper-containing wastewater comprises the steps of:
adding a flocculating agent into the neutralization reaction tank, and treating the copper-containing wastewater by using a flocculation reactor; and
coagulant aid is added into the neutralization reaction tank, and a coagulant aid reactor is used for treating the copper-containing wastewater.
7. The method for treating copper-containing wastewater as recited in claim 6, wherein the step of separating solid impurities from the copper-containing wastewater and filtering the copper-containing wastewater comprises:
introducing the copper-containing wastewater into a sedimentation tank from the neutralization reaction tank, and filtering out sediment at the bottom of the copper-containing wastewater;
introducing sulfuric acid into the sedimentation tank to adjust the pH value of the copper-containing wastewater;
treating the copper-containing wastewater by using an air floatation machine, and separating out solid impurities in the copper-containing wastewater; and
and filtering the copper-containing wastewater by using a bag filter.
8. A method for treating copper-containing wastewater as recited in claim 3, wherein after the step of separating solid impurities from said copper-containing wastewater and filtering said copper-containing wastewater, the method comprises:
detecting the concentration of copper ions in the filtered wastewater; and
when the concentration of copper ions in the wastewater is greater than a threshold value, introducing the wastewater into the wastewater pool; and discharging the wastewater when the concentration of copper ions in the wastewater is less than a threshold value.
9. The method for treating copper-containing wastewater as recited in claim 1, wherein a heavy metal scavenger is continuously added to the copper-containing wastewater, and wherein the heavy metal scavenger comprises sodium sulfide in the step of performing a second disruption of complex copper in the copper-containing wastewater.
10. The method for treating copper-containing wastewater according to claim 1, wherein the copper-containing wastewater is wastewater in copper foil production.
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