CN103641227A - Method for eliminating heavy metal in industrial sewage - Google Patents
Method for eliminating heavy metal in industrial sewage Download PDFInfo
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- CN103641227A CN103641227A CN201310661201.1A CN201310661201A CN103641227A CN 103641227 A CN103641227 A CN 103641227A CN 201310661201 A CN201310661201 A CN 201310661201A CN 103641227 A CN103641227 A CN 103641227A
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Abstract
The invention discloses a method for eliminating heavy metal in industrial sewage. The method comprises the following steps: adjusting the pH value of industrial sewage to be 7-8; subsequently adding sodium sulfide, adjusting the pH value to be 9-10, and reacting sulfur ions with most heavy metal ions so as to generate a precipitate of sulfide, wherein the generation of a harmful gas hydrogen sulfide is effectively prevented; subsequently adding ferrous sulfate while stirring, and reacting with sulfur ions to generate a precipitate of ferrous sulfide and eliminate pollution caused by redundant sulfur ions; adjusting the pH value of the industrial sewage back to be neutral by utilizing the faintly acid of ferrous sulfate, wherein the pollution that a harmful gas hydrogen sulfide can be generated when the pH value is adjusted by using acid is also avoided; press-filtering and subsequently discharging. The method for eliminating the heavy metal in the industrial sewage is simple in process procedure and high in universality, and requirements for eliminating heavy metal in various industrial sewage can be met.
Description
Technical field
The present invention relates to the technical field of disposing containing heavy metal industrial sewage, relate in particular to a kind of method of removing heavy metal in industrial sewage.
Background technology
Since 20th century, scientific and technical fast development, has promoted expanding economy, has improved the people's standard of living, yet 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 environment and people's health is caused to very large harm, therefore, caused countries in the world scientists' great attention, 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 processing containing higher concentration effluent containing heavy metal ions, and chemical method is to process at present the main method of heavy metal-containing waste water both at home and abroad.Physical treatment process mainly comprises solvent extraction and separation, ion exchange method, membrane separation technique and absorption method.Biological treatment is the method for heavy metal in waste water of removing by effects such as the flocculation of microorganism or plant, absorption, accumulation, enrichments, comprises the methods such as biological adsorption, biofloculation, phytoremediation.
For certain concrete heavy metal, a lot of patents have all provided concrete technical scheme.For example application publication number is CN 102358653 A, and the patent that name is called " a kind for the treatment of process containing selenium waste water " discloses a kind ofly to be removed selenium by two-stage and process the method containing selenium waste water; Application publication number is CN 102476853 A, the patent that name is called " a kind for the treatment of process of lead waste water " discloses after a kind of elder generation adds membranous surface activity agent stirring at low speed in flowing carrier and has made film phase, again the interior water medicament with film equal volume is slowly added and high-speed stirring makes and pours in waste water stoste stratification high pressure breakdown of emulsion again after Water in Oil emulsion into, isolate oil phase and interior water, 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 ease of Use the method for removal heavy metal.
Summary of the invention
In order to solve the technical problem existing in background technology, the present invention is intended to propose a kind of method that highly versatile, technique are simply removed heavy metal in industrial sewage.
A kind of method of 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, the pH value that makes industrial sewage is 9-10, sulfonium ion reacts the precipitation that generates sulfide with most of heavy metal ion;
S3: after the industrial sewage of whipping step S2 gained, add ferrous sulfate, with the precipitation of sulfonium ion generation Iron sulfuret;
S4: utilize the slightly acidic of ferrous sulfate that the pH value of industrial sewage is recalled to neutrality;
S5: press filtration.
Further, after being obtained industrial sewage and filtered, described step S2 carries out again the operation of step S3.
Preferably; described industrial sewage is developing solution; with salt, extract and reclaim after silver nitride precipitation; 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 again step S2: adding excessive sodium sulphite to pH value is 9.5, reaction 30MIN; Carry out again step S3: under stirring, add appropriate ferrous sulfate, making pH value is 7, stir 30MIN; Press filtration, filtrate meets three class emission standards.
Preferably, described industrial sewage is contained waste liquid, after Fenton oxidation is removed COD, first carry out step S1: regulate pH value to 7.5, then carry out step S2: add appropriate sodium sulphite, to pH value be 9.8, reaction 30MIN, carry out again step S3: under stirring, add appropriate ferrous sulfate, 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: regulate pH value to 7.2; Carry out again step S2: add appropriate sodium sulphite, to pH value be 9.6, reaction 30MIN; Carry out again step S3: under stirring, add appropriate ferrous sulfate, make pH value to 7.2, stir 30MIN, centrifugation; Filtrate meets three class emission standards.
Based on disclosing of technique scheme, under the condition that in described removal industrial sewage provided by the invention, the method for heavy metal is 7-8 at pH value, add sodium sulphite, the pH value that makes waste water is 9-10, now not only sulfonium ion can react with most of heavy metal ion the precipitation that generates sulfide, and can effectively prevent the generation of toxic gas hydrogen sulfide; With ferrous sulfate, excessive sulfonium ion is generated again to the precipitation of Iron sulfuret, the pollution causing to remove unnecessary sulfonium ion, utilize the slightly acidic of ferrous sulfate simultaneously, the pH value of waste water can be recalled to and avoided the pollution that regulates pH value can produce hydrogen sulfide toxic gas with acid neutral time; 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 of 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, the pH value that makes industrial sewage is 9-10, sulfonium ion reacts the precipitation that generates sulfide with most of heavy metal ion;
S3: after the industrial sewage of whipping step S2 gained, add ferrous sulfate, with the precipitation of sulfonium ion generation Iron sulfuret;
S4: utilize the slightly acidic of ferrous sulfate that the pH value of industrial sewage is recalled to neutrality;
S5: press filtration.
In operation, after can described step S2 being obtained industrial sewage and filtered, carry out again the operation of step S3.
embodiment 1
Described industrial sewage is developing solution, with salt, extract to reclaim after silver nitride precipitation, and 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; Under stirring, add appropriate ferrous sulfate, making pH value is 7, stirs 30MIN; Press filtration, filtrate meets three class emission standards.
embodiment 2
Described industrial sewage is contained waste liquid, after Fenton oxidation is removed COD, first regulate pH value to 7.5, then add appropriate sodium sulphite, to pH value be 9.8, reaction 30MIN, then under agitation adds appropriate ferrous sulfate, makes 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 regulates pH value to 7.2; Add again appropriate sodium sulphite, to pH value be 9.6, 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, under the condition that in described removal industrial sewage provided by the invention, the method for heavy metal is 7-8 at pH value, add sodium sulphite, the pH value that makes waste water is 9-10, now not only sulfonium ion can react with most of heavy metal ion the precipitation that generates sulfide, and can effectively prevent the generation of toxic gas hydrogen sulfide; With ferrous sulfate, excessive sulfonium ion is generated again to the precipitation of Iron sulfuret, the pollution causing to remove unnecessary sulfonium ion, utilize the slightly acidic of ferrous sulfate simultaneously, the pH value of waste water can be recalled to and avoided the pollution that regulates pH value can produce hydrogen sulfide toxic gas with acid neutral time; The method technical process is simple, highly versatile, can meet the needs of all types of industries sewage removal heavy metal.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; according to technical scheme of the present invention and inventive concept thereof, be equal to replacement or changed, within all should being encompassed in protection scope of the present invention.
Claims (5)
1. a method of removing heavy metal in industrial sewage, is characterized in that, 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, the pH value that makes industrial sewage is 9-10, sulfonium ion reacts the precipitation that generates sulfide with most of heavy metal ion;
S3: after the industrial sewage of whipping step S2 gained, add ferrous sulfate, with the precipitation of sulfonium ion generation Iron sulfuret;
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, after described step S2 is obtained industrial sewage and filtered, carries out the operation of step S3 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; with salt, extract and reclaim after silver nitride precipitation; 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 carries out step S2: adding excessive sodium sulphite to pH value is 9.5, reaction 30MIN; Carry out again step S3: under stirring, add appropriate ferrous sulfate, making pH value is 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, after Fenton oxidation is removed COD, first carries out step S1: regulate pH value to 7.5, carry out again step S2: add appropriate sodium sulphite, to pH value be 9.8, reaction 30MIN, then carries out step S3: under stirring, add appropriate ferrous sulfate, 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, is characterized in that, described industrial sewage is nickel-containing waste water, first carries out step S1: regulate pH value to 7.2; Carry out again step S2: add appropriate sodium sulphite, to pH value be 9.6, reaction 30MIN; Carry out again step S3: under stirring, add appropriate ferrous sulfate, make pH value to 7.2, stir 30MIN, centrifugation; Filtrate meets three class emission standards.
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| CN201310661201.1A CN103641227B (en) | 2013-12-10 | 2013-12-10 | A kind of method removing heavy metal in industrial sewage |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150634A (en) * | 2014-05-15 | 2014-11-19 | 浙江海洋学院 | Treatment method of water polluted by mercury |
| 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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| 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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| CN103641227B (en) | 2016-03-23 |
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