CN1008624B - Method for treating heavy metal-containing sewage by using magnetic cast iron powder - Google Patents
Method for treating heavy metal-containing sewage by using magnetic cast iron powderInfo
- Publication number
- CN1008624B CN1008624B CN 87105033 CN87105033A CN1008624B CN 1008624 B CN1008624 B CN 1008624B CN 87105033 CN87105033 CN 87105033 CN 87105033 A CN87105033 A CN 87105033A CN 1008624 B CN1008624 B CN 1008624B
- Authority
- CN
- China
- Prior art keywords
- sewage
- heavy metal
- iron powder
- cast iron
- magnetic cast
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000010865 sewage Substances 0.000 title claims abstract description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 14
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 10
- 239000002253 acid Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 230000001112 coagulating effect Effects 0.000 claims abstract description 4
- 230000003647 oxidation Effects 0.000 claims abstract description 4
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000006228 supernatant Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 150000002500 ions Chemical class 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 239000003513 alkali Substances 0.000 abstract description 3
- 238000006386 neutralization reaction Methods 0.000 abstract description 2
- 230000002378 acidificating effect Effects 0.000 abstract 1
- 239000010802 sludge Substances 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000012535 impurity 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
- 230000005415 magnetization Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Removal Of Specific Substances (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a method for treating sewage containing heavy metal by using magnetic cast iron powder, which comprises the steps of firstly adjusting the acid content of the sewage according to the components and the concentration of heavy metal ions contained in the sewage, enabling the acidic sewage to have efficient and stable reaction with the magnetic cast iron powder, then carrying out oxidation treatment on the sewage by using compressed air, and when adding alkali for neutralization, automatically coagulating and settling metal sludge in the sewage, thereby effectively solving the problem of secondary pollution, and enabling the obtained water quality to reach the specified discharge standard. The invention can economically and effectively treat various kinds of sewage containing heavy metal ions.
Description
The invention belongs to the processing method that contains heavy metal-polluted water treatment, particularly adopt magnetic cast iron powder to handle the method that contains heavy metal containing sewage.
It is a lot of to contain the disclosed treatment process kind of heavy metal containing sewage, and using iron powder to handle the patent that contains heavy metal containing sewage also has multinomial.As Holland's NL7404-782 patent " from sewage, removing the method for beavy metal impurity " in 1974, this method is to add ferrous sulfate earlier, a small amount of iron powder and highly basic produce hydroxide colloid, feed 60 ℃ of oxygen or air again and make colloid transform generation ferromagnetic material precipitation, separated by magnetic field then.Domestic existing usefulness " iron powder body " method sewage treatment method.These methods all exist some shortcomings, as consuming shortcomings such as a large amount of medicines, heat energy.
Task of the present invention is exactly to want economical, solve the problem that slag liquid separates and improves reduction reaction speed in the sewage treatment process effectively.
Task of the present invention is finished in the following manner: at first according to the content of heavy metal ion in the sewage, kind is carried out the acid amount and is regulated, making the acidity of sewage remain on the pH value equals between 1.5-2.5, contain heavy metal ion, the sewage and the magnetized cast iron powder that regulate acidity react, the pH value is raised to 5.4 above reactions and has just finished, allow sewage in the container that is connected with pressurized air or oxygen, carry out oxidation then at normal temperatures, this moment, the pH value should remain between the 6-6.6, after 3-10 minute, with buck and sewage, make its pH value be raised to 8 and condense stirring after 10 minutes, supernatant water separates with regard to available settling separation device with the coagulative precipitation thing.
Below in conjunction with accompanying drawing the present invention is further described:
Fig. 1 is a process flow sheet of the present invention.
Acid amount regulating tank 1 is used for regulating the free acid content of sewage among the figure, and free acid can add sulfuric acid or hydrochloric acid after a little while in the sewage, if free acid is too many, add the alkali neutralization, makes the content of free acid in the sewage keep the pH value between 1.5-2.5.When contain hexavalent chromium concentration greater than 100 liters/time, the pH value should be transferred to below 2.0.The sewage that regulates acid amount is squeezed into the bottom by pump and is equipped with in the reactor 3 of magnetic cast iron powder 2, and for fast reaction speed, the flow velocity of sewage should be able to make magnetic cast iron powder be in " boiling " state, needs only at 10 minutes like this and just can finish with internal reaction.Water outlet this moment pH value rises to more than 5.4, and the sewage of finishing reaction from reactor 3 enters in the knockouts 6 that mechanical stirrer 4 and compressed air pipe 5 are housed, and at normal temperatures, feeds pressurized air earlier and makes the abundant oxidation of unnecessary ferrous ion.Pass through 3-10 minute under mechanical stirrer 4 slowly stirs, add 10% sodium hydroxide solution or other alkali neutralizes, continue to stir 3-10 minute when the pH value is raised to 8, this moment, flocking settling just took place in the oxyhydroxide of metal voluntarily, and the flocking settling thing of formation is easy to separate with supernatant water.A small amount of suspended substance can adopt the simple filtration method to remove in the supernatant water.The coagulative precipitation thing has good filterableness, and available general settling separation device reaches slag liquid with filter plant thoroughly to be separated.Water after the filtration can directly discharge, or gets to the water head tank recycling by pump.The wet slag cake just can be transformed into ferrite in about 120 ℃ oven dry of temperature, has solved the secondary pollution problem, and metallurgy industry then can directly reclaim heavy metal to the wet slag cake by smelting.The also available mechanical stirrer formula of reactor 3 cylinder replaces.
Use the present invention very effective as can be seen by table 1, effectively the removing heavy metals ion to the waste water of handling electroplating industry.Because the present invention uses magnetic cast iron powder, so speed of response is very fast, improved processing efficiency and treatment effect, and cast iron powder can be produced with the useless smear metal of mechanical industry.
The magnetization of cast iron powder, available electro-magnet, also available permanent magnet magnetizes, so its is with low cost.
Claims (2)
1, a kind of method that contains heavy metal containing sewage of handling with magnetic cast iron powder, it is characterized in that, at first carrying out the acid amount according to heavy metal ion composition and concentration in the sewage regulates, the acidity of sewage is remained between the pH=1.5-2.5, make sewage then and magnetized cast iron powder and react, reaction back pH value rises to more than 5.4, at normal temperatures, make sewage in the container that is connected with pressurized air or oxygen, carry out oxidation, this moment, the pH value should remain between 6-6.6, after 3 to 10 minutes, supernatant water separates with regard to available settling separation device with coagulative precipitation.
2, method according to claim 1 is characterized in that when containing sexavalence lattice ionic concn above 100 mg/litre in the sewage, and the acid amount is regulated back pH value between 1.5-2.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87105033 CN1008624B (en) | 1987-07-07 | 1987-07-07 | Method for treating heavy metal-containing sewage by using magnetic cast iron powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87105033 CN1008624B (en) | 1987-07-07 | 1987-07-07 | Method for treating heavy metal-containing sewage by using magnetic cast iron powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87105033A CN87105033A (en) | 1987-12-23 |
| CN1008624B true CN1008624B (en) | 1990-07-04 |
Family
ID=4815122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87105033 Expired CN1008624B (en) | 1987-07-07 | 1987-07-07 | Method for treating heavy metal-containing sewage by using magnetic cast iron powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1008624B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2006332710B2 (en) * | 2005-12-29 | 2012-07-12 | Micronose Technologies, Inc. | Methods and compositions for removal of arsenic and heavy metals from water |
| CN113231456A (en) * | 2021-03-31 | 2021-08-10 | 四川轻化工大学 | Heavy metal contaminated soil remediation method based on magnetic composite particles |
-
1987
- 1987-07-07 CN CN 87105033 patent/CN1008624B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN87105033A (en) | 1987-12-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |