CN1091751C - 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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- CN1091751C CN1091751C CN97106553A CN97106553A CN1091751C CN 1091751 C CN1091751 C CN 1091751C CN 97106553 A CN97106553 A CN 97106553A CN 97106553 A CN97106553 A CN 97106553A CN 1091751 C CN1091751 C CN 1091751C
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- absorption liquid
- heavy metal
- flue gas
- ion
- reduction
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- Treating Waste Gases (AREA)
Abstract
The present invention relates to a method for removing heavy metal from absorption liquid of flue gas. The method comprises the steps that absorption liquid of flue gas is split into a reduction part and a direct flow part, wherein the proportion of the reduction part of the absorption liquid is smaller than or equal to 5%; biologic anaerobic treatment is carried out to form sulfur ions of negative bivalence, which have great activity; the direct flow part is pretreated through precipitation to remove sulfite radical ions and most of sulfate radical ions; the reduction part is mixed with the direct flow part, and metal sulfide precipitates are generated by a reaction between the sulfur ions of negative bivalence and heavy metal; and heavy metal precipitates generated after the chemical reaction is removed. Treated waste water completely reaches the emission standard, and the mercury content is lower than 0.049 mg/l.
Description
The present invention relates to a kind of method of removing heavy metal in the waste water, particularly relate to a kind of method of removing heavy metal in the flue gas absorption liquid.
The common method of removing heavy metal in the waste water has: hydroxide precipitation method, the metallo-chelate precipitator method and the metallic sulfide precipitator method.But they all must add a large amount of chemical agents, are easy to generate new pollution.And make heavy metal Hg reach quite difficulty of emission standard.
The method of utilizing the anaerobic sludge Treatment of Zinc-containing Wastewater into proposition was once arranged, although it has avoided the use chemical agent, anaerobic sludge of Chan Shenging and heavy metal sewage sludge are lumped together therefrom, cause the difficulty of sludge treatment.In addition, this method mainly to as if zinc-containing water, and be not suitable for the waste water that contains oxidizing substance, as flue gas absorption liquid.
The present invention aims to provide and a kind ofly needn't adopt any chemical agent, also can not produce the method for heavy metal in the removal flue gas absorption liquid of new pollution.It can guarantee that various heavy metal content all reach emission standard in the flue gas absorption liquid.
The object of the present invention is achieved like this:
1) flue gas absorption liquid is divided into reduction, direct current two parts, ratio≤5% of absorption liquid reduction part;
2) reduction of absorption liquid is partly made bio anaerobic and handled, wherein sulfate radical, inferior sulfate radical is reduced to the hydrosulphuric acid root, form active big negative sulfidion;
3) with the method for neutralization, oxidation, chemical precipitation the absorption liquid direct component is done pre-treatment, remove sulfite ion, and sulfate ion concentration is reduced to below the 600mg/l;
4) will mix with the absorption liquid direct component of removing sulfate ion through the absorption liquid reduction part that bio anaerobic is handled, the sulfonium ion of negative divalence and heavy metal reaction generate the metallic sulfide precipitation;
5) remove the heavy metal precipitation thing that generates behind the chemical reaction.
The present invention is owing to adopted the treatment process that flue gas absorption liquid is divided into two, and respectively the reduction part is done different pre-treatment with direct component, thereby create and to form the condition of chemical precipitation, and under the situation of not using chemical agent, finish the heavy metal precipitation reaction by absorption liquid self composition.Do not produce new pollution;
The sulfonium ion of negative divalence results from absorption liquid self, and the negative sulfidion reactive behavior of nascent state is big, removes the efficient height of heavy metal, and has solved for a long time that heavy metal Hg is difficult to big problem up to standard.
Below, introduce embodiments of the invention in conjunction with the accompanying drawings in detail.
Accompanying drawing is a schema of the present invention.
Embodiment one
The output of certain garbage combustion device flue gas absorption liquid is: 45M
3/ hr, the content of heavy metal is
Unit: mg/l (except that the pH value)
Sub-fraction 0.4～2.0M with flue gas absorption liquid
3/ hr is that the organic sewage of 6500mg/l is made anaerobic treatment as the reduction part with COD.Remaining absorption liquid uses the method for secondary neutralization, oxidation, chemical precipitation to handle as direct component.Use CaCO earlier
3Remove a large amount of sulfate ions:
| pH | 0.8 | Hg | 8.7 |
| Cl - | 14900 | Pb | 8.8 |
| SO 4 ＝ | 870 | Cu | 1.88 |
| F - | 60 | Ni | 0.08 |
| Cd | 0.56 | Zn | 22 |
Again the pH value of absorption liquid is transferred to about 4.5 aeration oxidation CaSO
3, generate gypsum deposition:
Use Na then
2CO
3Continue adjust pH to neutral range, use remaining inferior sulfate radical in the method oxidation absorption liquid of aeration again:
Absorption liquid reduction part, under anaerobic sulfatereducting bacteria reduced sulphur acid group is the hydrosulphuric acid root:
The reduction of the direct component of absorption liquid and anaerobism water outlet is partially mixed, and heavy metal ion and the reaction of hydrosulphuric acid root generate sulfide precipitation:
It is as follows to remove the accessible decontamination effect improving of heavy metal precipitation thing:
Unit: mg/l (except that the pH value)
| pH | 6.5 | Hg | 0.049 |
| Cl - | 12000 | Pb | 0.076 |
| SO 4 ＝ | 580 | Cu | 0.15 |
| F - | 60 | Ni | 0.06 |
| Cd | 0.024 | Zn | 0.78 |
Processed waste water reaches emission standard fully.
Claims (1)
1. a method of removing heavy metal in the flue gas absorption liquid is characterized in that 1) flue gas absorption liquid is divided into reduction, direct current two parts, ratio≤5% of absorption liquid reduction part;
2) reduction of absorption liquid is partly made bio anaerobic and is handled, and wherein sulfate radical, inferior sulfate radical is reduced to the hydrosulphuric acid root, forms active big negative sulfidion;
3) with the method for neutralization, oxidation, chemical precipitation the absorption liquid direct component is done pre-treatment, remove sulfite ion, and sulfate ion concentration is reduced to below the 600mg/l;
4) will mix with the absorption liquid direct component of removing sulfite ion and most of sulfate ion through the absorption liquid reduction part that bio anaerobic is handled, the sulfonium ion of negative divalence and heavy metal ion reaction generate the metallic sulfide precipitation;
5) remove the heavy metal precipitation thing that generates behind the 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 CN1175553A (en) | 1998-03-11 |
| CN1091751C true 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 |
|---|---|
| CN (1) | CN1091751C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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1997
- 1997-08-08 CN CN97106553A patent/CN1091751C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1175553A (en) | 1998-03-11 |
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