CN1175553A - Method for removing heavy metals in flue gas absorption liquid - Google Patents
Method for removing heavy metals in flue gas absorption liquid Download PDFInfo
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- CN1175553A CN1175553A CN97106553A CN97106553A CN1175553A CN 1175553 A CN1175553 A CN 1175553A CN 97106553 A CN97106553 A CN 97106553A CN 97106553 A CN97106553 A CN 97106553A CN 1175553 A CN1175553 A CN 1175553A
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- absorption liquid
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- flue gas
- heavy metals
- reduction part
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Abstract
A process for removing heavy metals from flue gas absorbed liquid includes dividing said flue gas absorbed liquid into reduction and straight flow parts (the ratio of reduction part is less than 5%), biologic anaerobic treatment of reduction part to form high-activity S (-2) ions, precipitating pretreating of straight flow part to remove ions of sulfurous acid radical and most of sulfuric acid radical, mixing both parts to react S ions (-2 valence) with heavy metals to produce metallic sulfide precipitate, and removing said precipitate. The Hg content in treated water is less than 0.049 mg/l.
Description
The invention relates to a method for removing heavy metals in wastewater, in particular to a method for removing heavy metals in flue gas absorption liquid.
Common methods for removing heavy metals from wastewater include: hydroxide precipitation, metal chelate precipitation, and metal sulfide precipitation. However, all of them must add a large amount of chemical agents, and are easy to generate new pollution. And the heavy metal mercury can hardly reach the emission standard.
There has been proposed a method for treating zinc-containing wastewater using anaerobic sludge, which, although avoiding the use of chemicals, causes difficulties in sludge treatment due to the mixing of the resulting anaerobic sludge with heavy metal sludge. Furthermore, the main object of this method is zinc-containing waste water, which is not suitable for waste water containing oxidizing substances, such as flue gas absorbing liquid.
The invention aims to provide a method for removing heavy metals in flue gas absorption liquid without using any chemical agent and generating new pollution. It can ensure that the content of various heavy metals in the flue gas absorption liquid reaches the emission standard.
The purpose of the invention is realized as follows:
1) the flue gas absorption liquid is divided into a reduction part and a direct current part, and the proportion of the reduction part of the absorption liquid is less than or equal to 5 percent;
2) carrying out biological anaerobic treatment on the reduction part of the absorption liquid, and reducing sulfate radicals and sulfite radicals in the absorption liquid into hydrogen sulfate radicals to form active large negative divalent sulfide ions;
3) pretreating the direct-current part of the absorption liquid by neutralization, oxidation and chemical precipitation to remove sulfite ions and most sulfate ions;
4) mixing the reduction part of the absorption liquid subjected to biological anaerobic treatment with the direct-current part of the absorption liquid from which sulfate ions are removed, and reacting the negative divalent sulfur ions with heavy metals to generate metal sulfide precipitates;
5) removing heavy metal precipitate generated after chemical reaction.
The invention adopts a treatment method of dividing the flue gas absorption liquid into two parts and respectively carries out different pretreatments on the reduction part and the direct current part, thereby creating the condition that the self components of the absorption liquid can form chemical precipitation and completing the heavy metal precipitation reaction without using chemical agents. No new pollution is generated;
the negative divalent sulfur ions are generated in the absorption liquid, the reaction activity of the nascent negative divalent sulfur ions is high, the efficiency of removing heavy metals is high, and the big problem that the heavy metal mercury cannot reach the standard for a long time is solved.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The attached drawing is a flow chart of the invention.
Example one
The yield of flue gas absorption liquid of a certain waste incineration device is as follows: 45M3Hr, heavy metal content of
A small part of the flue gas absorption liquid is 0.4-2.0M3The reduction part is treated anaerobically with organic sewage of 6500mg/l COD. The rest absorption liquid is used as a direct current part and is treated by methods of secondary neutralization, oxidation and chemical precipitation. Using CaCO first3Removing a large amount of sulfate ions:
| pH | 0.8 | Hg | 8.7 |
| Cl- | 14900 | Pb | 8.8 |
| SO4 ＝ | 870 | Cu | 1.88 |
| F- | 60 | Ni | 0.08 |
| Cd | 0.56 | Zn | 22 |
then the pH value of the absorption liquid is adjusted to about 4.5, and CaSO is aerated and oxidized3And (3) generating gypsum precipitate: then using Na2CO3Continuously adjusting the pH value to a neutral range, and oxidizing the residual sulfite in the absorption liquid by an aeration method:
and (3) reducing sulfate radicals into hydrogen sulfate radicals by the reducing bacteria of the absorption liquid under the anaerobic condition:
the direct flow part of the absorption liquid and the reduction part of the anaerobic effluentMixing, and reacting heavy metal ions with hydrogen sulfate to generate sulfide precipitate:
the purification effect achievable for removing heavy metal precipitates is as follows:
the treated wastewater completely reaches the discharge standard.
| pH | 6.5 | Hg | 0.049 |
| Cl- | 12000 | Pb | 0.076 |
| SO4 ＝ | 580 | Cu | 0.15 |
| F- | 60 | Ni | 0.06 |
| Cd | 0.024 | Zn | 0.78 |
Claims (1)
1. A method for removing heavy metals in flue gas absorption liquid is characterized in that
1) The flue gas absorption liquid is divided into a reduction part and a direct current part, and the proportion of the reduction part of the absorption liquid is less than or equal to 5 percent;
2) the reduction part of the absorption liquid is subjected to biological anaerobic treatment, sulfate radicals and sulfite radicals in the absorption liquid are reduced into hydrogen sulfate radicals, and negative divalent sulfide ions with high activity are formed;
3) pretreating the direct-current part of the absorption liquid by neutralization, oxidation and chemical precipitation to basically remove sulfite ions and most sulfate ions;
4) mixing the reduction part of the absorption liquid subjected to biological anaerobic treatment with the direct-current part of the absorption liquid from which sulfite ions and most sulfate ions are removed, and reacting the negative divalent sulfur ions with heavy metal ions to generate metal sulfide precipitate;
5) removing heavy metal precipitate generated after chemical reaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97106553A CN1091751C (en) | 1997-08-08 | 1997-08-08 | Method for removing heavy metals in flue gas absorption liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97106553A CN1091751C (en) | 1997-08-08 | 1997-08-08 | Method for removing heavy metals in flue gas absorption liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1175553A true CN1175553A (en) | 1998-03-11 |
| CN1091751C CN1091751C (en) | 2002-10-02 |
Family
ID=5168785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97106553A Expired - Fee Related CN1091751C (en) | 1997-08-08 | 1997-08-08 | Method for removing heavy metals in flue gas absorption liquid |
Country Status (1)
| Country | Link |
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| CN (1) | CN1091751C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106268259A (en) * | 2016-09-18 | 2017-01-04 | 昆明理工大学 | SO in a kind of flue gas2method with the removing of Hg biochemical synchronization |
| CN112777888A (en) * | 2020-12-24 | 2021-05-11 | 南京农业大学 | Treatment method for removing and recycling heavy metals in wastewater sludge based on biological sulfur circulation |
-
1997
- 1997-08-08 CN CN97106553A patent/CN1091751C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106268259A (en) * | 2016-09-18 | 2017-01-04 | 昆明理工大学 | SO in a kind of flue gas2method with the removing of Hg biochemical synchronization |
| CN106268259B (en) * | 2016-09-18 | 2018-09-28 | 昆明理工大学 | SO in a kind of flue gas2With the method for Hg biochemical synchronizations removing |
| CN112777888A (en) * | 2020-12-24 | 2021-05-11 | 南京农业大学 | Treatment method for removing and recycling heavy metals in wastewater sludge based on biological sulfur circulation |
| CN112777888B (en) * | 2020-12-24 | 2022-04-19 | 南京农业大学 | Treatment method for removing and recycling heavy metals in wastewater sludge based on biological sulfur circulation |
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| Publication number | Publication date |
|---|---|
| CN1091751C (en) | 2002-10-02 |
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