CN1008624B - Treatment of waste water containing heavy metals by magnetic cast iron powder - Google Patents
Treatment of waste water containing heavy metals by 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
- iron powder
- cast iron
- heavy metal
- 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
Landscapes
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Removal Of Specific Substances (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The present invention discloses a method for treating sewage containing heavy metal by magnetic cast iron powder. Firstly, the acid quantity of sewage is regulated according to the components and the concentration of heavy metal ions contained in the sewage so that the acidic sewage generates an efficient and stable reaction with magnetic cast iron powder; then, the sewage is oxidized by compressed air; when alkali is added for neutralization, metal sludge in the sewage can automatically coagulate and settle; the problem of secondary pollution is effectively solved; moreover, obtained water quality reaches prescribed discharge standards. The present invention can economically and effectively treat all kinds of sewage containing the 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 | Treatment of waste water containing heavy metals by 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 | Treatment of waste water containing heavy metals by 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 | Treatment of waste water containing heavy metals by 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 |
|---|---|---|---|---|
| MX2008008537A (en) * | 2005-12-29 | 2009-01-27 | 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 |