CN103641227B - A kind of method removing heavy metal in industrial sewage - Google Patents
A kind of method removing heavy metal in industrial sewage Download PDFInfo
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- CN103641227B CN103641227B CN201310661201.1A CN201310661201A CN103641227B CN 103641227 B CN103641227 B CN 103641227B CN 201310661201 A CN201310661201 A CN 201310661201A CN 103641227 B CN103641227 B CN 103641227B
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Abstract
The invention discloses a kind of method removing heavy metal in industrial sewage, the pH value of industrial sewage is first adjusted to 7-8 by it; Then add sodium sulphite, adjust ph is 9-10, makes sulfonium ion and most of heavy metal ion react the precipitation generating sulfide, and effectively can prevent the generation of toxic gas hydrogen sulfide; Then under agitation add ferrous sulfate, generate the precipitation of Iron sulfuret with sulfonium ion, to remove the pollution that unnecessary sulfonium ion causes; Utilizing the slightly acidic of ferrous sulfate that the pH value of industrial sewage is recalled to neutrality, also avoid the pollution that can produce hydrogen sulfide toxic gas with acid for adjusting pH value simultaneously; Discharge after press filtration.In this removal industrial sewage, simple, the highly versatile of the method technical process of heavy metal, can meet the needs of all types of industries sewage removal heavy metal.
Description
Technical field
The present invention relates to the technical field containing heavy industries Sewage disposal, particularly relate to a kind of method removing heavy metal in industrial sewage.
Background technology
Since 20th century, scientific and technical fast development, facilitates expanding economy, improves the standard of living of the people, but meanwhile, the mankind have also paid heavy cost.Secondly the pollution main source industrial pollution of heavy metal is traffic pollution and living garbage pollution.Industrial pollution enters environment by waste residue, waste water, waste gas mostly, enrichment in humans and animals, plant, thus very large harm is caused to the health of environment and people, therefore, cause the great attention of countries in the world scientist, addressed this problem extremely urgent.
At present, the method for heavy metal containing wastewater treatment roughly can be divided into three major types: (1) chemical method; (2) physical treatment process; (3) biological treatment.Chemical method will comprise chemical precipitation method and electrolytic process, is mainly applicable to the process containing higher concentration effluent containing heavy metal ions, and chemical method is the main method of process heavy metal-containing waste water both at home and abroad at present.Physical treatment process mainly comprises solvent extraction and separation, ion exchange method, membrane separation technique and absorption method.Biological treatment is the method removing heavy metal in waste water by the effect such as flocculation, absorption, accumulation, enrichment of microorganism or plant, comprises the methods such as biological adsorption, biofloculation, phytoremediation.
For the heavy metal that certain is concrete, a lot of patent all gives concrete technical scheme.For example application publication number is CN102358653A, what name was called " a kind for the treatment of process containing selenium waste water " patent discloses a kind of by two-stage except selenium processes method containing selenium waste water; Application publication number is CN102476853A, name is called that patent discloses after one first adds membranous surface activity agent stirring at low speed in flowing carrier of " a kind for the treatment of process of lead waste water " obtains film phase, slowly will add after also high-speed stirring obtains Water in Oil emulsion with aqueous phase medicament in film equal volume again and pour stratification high pressure breakdown of emulsion again in waste water stoste into, isolate oil phase and interior aqueous phase, make water outlet reach the treatment process of the lead waste water of discharging standards.
But, for universal industrial sewage still lack a set of maturation, can the method for removal heavy metal of ease of Use.
Summary of the invention
In order to solve the technical problem existed in background technology, the present invention is intended to propose a kind of method that highly versatile, technique simply remove heavy metal in industrial sewage.
A kind of method removing heavy metal in industrial sewage that the present invention proposes, comprises the following steps:
S1: the pH value of industrial sewage is adjusted to 7-8;
S2: add sodium sulphite in the industrial sewage of step S1 gained, make the pH value of industrial sewage be 9-10, sulfonium ion and most of heavy metal ion react the precipitation generating sulfide;
After the industrial sewage of S3: whipping step S2 gained, add ferrous sulfate, generate the precipitation of Iron sulfuret with sulfonium ion;
Fe
2(SO
4)
3+6NaOH＝＝＝＝2Fe(OH)
3+3Na
2SO
4
FeSO
4+S
2-→FeS
↓+SO
4 2-
12FeSO
4+6H
2O+3O
2＝＝＝＝4Fe
2(SO
4)
3+4Fe(OH)
3
S4: utilize the slightly acidic of ferrous sulfate that the pH value of industrial sewage is recalled to neutrality;
S5: press filtration.
Further, the operation carrying out step S3 after industrial sewage filters again is obtained to described step S2.
Preferably, described industrial sewage is developing solution, after extracting recovery silver nitride precipitation with salt, in developing solution, also residual a small amount of silver ions and cupric ion do not meet emission standard, first carry out step S1: the pH value of this waste water is adjusted to 7.3, carry out step S2 again: adding excessive sodium sulphite to pH value is 9.5, reaction 30MIN; Carry out step S3 again: under stirring, add appropriate ferrous sulfate, make pH value be 7, stir 30MIN; Press filtration, filtrate meets three class emission standards.
Preferably, described industrial sewage is contained waste liquid, remove after COD through Fenton oxidation, first carrying out step S1: adjust ph to 7.5, then carry out step S2: add appropriate sodium sulphite, is 9.8 to pH value, reaction 30MIN, carry out step S3 again: add appropriate ferrous sulfate under stirring, make pH to 7.3, stir 30MIN; Press filtration, filtrate meets three class emission standards.
Preferably, described industrial sewage is nickel-containing waste water, first carries out step S1: adjust ph to 7.2; Carrying out step S2 again: add appropriate sodium sulphite, is 9.6 to pH value, reaction 30MIN; Carry out step S3 again: add appropriate ferrous sulfate under stirring, make pH value to 7.2, stir 30MIN, centrifugation; Filtrate meets three class emission standards.
Disclosing based on technique scheme, in described removal industrial sewage provided by the invention, the method for heavy metal is add sodium sulphite under the condition of 7-8 in pH value, the pH value of waste water is made to be 9-10, now not only sulfonium ion can react with most of heavy metal ion the precipitation generating sulfide, and effectively can prevent the generation of toxic gas hydrogen sulfide; With ferrous sulfate, excessive sulfonium ion is generated the precipitation of Iron sulfuret again, to remove the pollution that unnecessary sulfonium ion causes, utilize the slightly acidic of ferrous sulfate simultaneously, while the pH value of waste water can being recalled to neutrality, avoid the pollution that can produce hydrogen sulfide toxic gas with acid for adjusting pH value; The method technical process is simple, highly versatile, can meet the needs of all types of industries sewage removal heavy metal.
Embodiment
Below in conjunction with embodiment, technical scheme provided by the invention is described further.
A kind of method removing heavy metal in industrial sewage that the present invention proposes, comprises the following steps:
S1: the pH value of industrial sewage is adjusted to 7-8;
S2: add sodium sulphite in the industrial sewage of step S1 gained, make the pH value of industrial sewage be 9-10, sulfonium ion and most of heavy metal ion react the precipitation generating sulfide;
After the industrial sewage of S3: whipping step S2 gained, add ferrous sulfate, generate the precipitation of Iron sulfuret with sulfonium ion;
S4: utilize the slightly acidic of ferrous sulfate that the pH value of industrial sewage is recalled to neutrality;
S5: press filtration.
In operation, can obtain to described step S2 the operation carrying out step S3 after industrial sewage filters again.
Embodiment 1
Described industrial sewage is developing solution, and after extracting recovery silver nitride precipitation with salt, in developing solution, also residual a small amount of silver ions and cupric ion do not meet emission standard.The pH value of this waste water is adjusted to 7.3; Adding excessive sodium sulphite to pH value is 9.5, reaction 30MIN; Add appropriate ferrous sulfate under stirring, make pH value be 7, stir 30MIN; Press filtration, filtrate meets three class emission standards.
Embodiment 2
Described industrial sewage is contained waste liquid, and removing after COD through Fenton oxidation, first adjust ph to 7.5, then add appropriate sodium sulphite, is 9.8 to pH value, and reaction 30MIN, then under agitation adds appropriate ferrous sulfate, make pH to 7.3, stirs 30MIN; Press filtration, filtrate meets three class emission standards.
Embodiment 3
Described industrial sewage is nickel-containing waste water, first adjust ph to 7.2; Adding appropriate sodium sulphite again, is 9.6 to pH value, reaction 30MIN; Then under agitation add appropriate ferrous sulfate, make pH value to 7.2, stir 30MIN, centrifugation; Filtrate meets three class emission standards.
To sum up, in described removal industrial sewage provided by the invention, the method for heavy metal is add sodium sulphite under the condition of 7-8 in pH value, the pH value of waste water is made to be 9-10, now not only sulfonium ion can react with most of heavy metal ion the precipitation generating sulfide, and effectively can prevent the generation of toxic gas hydrogen sulfide; With ferrous sulfate, excessive sulfonium ion is generated the precipitation of Iron sulfuret again, to remove the pollution that unnecessary sulfonium ion causes, utilize the slightly acidic of ferrous sulfate simultaneously, while the pH value of waste water can being recalled to neutrality, avoid the pollution that can produce hydrogen sulfide toxic gas with acid for adjusting pH value; The method technical process is simple, highly versatile, can meet the needs of all types of industries sewage removal heavy metal.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (5)
1. remove a method for heavy metal in industrial sewage, it is characterized in that, comprise the following steps:
S1: the pH value of industrial sewage is adjusted to 7-8;
S2: add sodium sulphite in the industrial sewage of step S1 gained, make the pH value of industrial sewage be 9-10, sulfonium ion and most of heavy metal ion react the precipitation generating sulfide;
After the industrial sewage of S3: whipping step S2 gained, add ferrous sulfate, generate the precipitation of Iron sulfuret with sulfonium ion;
S4: utilize the slightly acidic of ferrous sulfate that the pH value of industrial sewage is recalled to neutrality;
S5: press filtration.
2. the method for heavy metal in removal industrial sewage according to claim 1, is characterized in that, obtain to described step S2 the operation carrying out step S3 after industrial sewage filters again.
3. the method for heavy metal in removal industrial sewage according to claim 1, it is characterized in that, described industrial sewage is developing solution, after extracting recovery silver nitride precipitation with salt, in developing solution, also residual a small amount of silver ions and cupric ion do not meet emission standard, first carry out step S1: the pH value of this waste water is adjusted to 7.3, then carry out step S2: adding excessive sodium sulphite to pH value is 9.5, reaction 30MIN; Carry out step S3 again: under stirring, add appropriate ferrous sulfate, make pH value be 7, stir 30MIN; Press filtration, filtrate meets three class emission standards.
4. the method for heavy metal in removal industrial sewage according to claim 1, it is characterized in that, described industrial sewage is contained waste liquid, removes after COD, first carry out step S1: adjust ph to 7.5 through Fenton oxidation, carry out step S2 again: add appropriate sodium sulphite, be 9.8 to pH value, reaction 30MIN, then carry out step S3: add appropriate ferrous sulfate under stirring, make pH to 7.3, stir 30MIN; Press filtration, filtrate meets three class emission standards.
5. the method for heavy metal in removal industrial sewage according to claim 1, it is characterized in that, described industrial sewage is nickel-containing waste water, first carries out step S1: adjust ph to 7.2; Carrying out step S2 again: add appropriate sodium sulphite, is 9.6 to pH value, reaction 30MIN; Carry out step S3 again: add appropriate ferrous sulfate under stirring, make pH value to 7.2, stir 30MIN, centrifugation; Filtrate meets three class emission standards.
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| CN104150634B (en) * | 2014-05-15 | 2015-08-19 | 浙江海洋学院 | A kind for the treatment of process of mercury pollution water |
| CN104787804A (en) * | 2015-04-21 | 2015-07-22 | 吉林大学 | Preparation and use method of FeS for repairing hexavalent chromium pollution underground water |
| CN105967398A (en) * | 2016-07-11 | 2016-09-28 | 崔金星 | Device and method for treating waste liquid produced by measuring ammonia nitrogen value |
| CN107162281A (en) * | 2017-07-21 | 2017-09-15 | 甘肃中顺石化工程装备有限公司 | The processing method and Waste Water Treatment of heavy metal ion in a kind of removal smelting wastewater |
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| CN102399040A (en) * | 2010-09-10 | 2012-04-04 | 沈阳工业大学 | Process for comprehensively treating sulfur dye waste water |
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| SU990677A1 (en) * | 1979-02-28 | 1983-01-23 | Ставропольский политехнический институт | Method for purifying acid effluents |
| CN1270146A (en) * | 1999-04-08 | 2000-10-18 | 柳州市环境保护科学研究所 | Process for treating sewage containing Zn and Cd |
| CN1673117A (en) * | 2005-03-17 | 2005-09-28 | 周石来 | Treating process of mercury-containing waste water |
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| CN103304059A (en) * | 2013-06-30 | 2013-09-18 | 金川集团股份有限公司 | System and method for treating acidic wastewater in metallurgical off-gas acid-making process |
| CN103342429A (en) * | 2013-07-30 | 2013-10-09 | 北京矿冶研究总院 | Method for recovering, treating and recycling valuable metals in waste acid |
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