CN104129869A - Stainless steel pickling wastewater treatment method - Google Patents
Stainless steel pickling wastewater treatment method Download PDFInfo
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- CN104129869A CN104129869A CN201410322188.1A CN201410322188A CN104129869A CN 104129869 A CN104129869 A CN 104129869A CN 201410322188 A CN201410322188 A CN 201410322188A CN 104129869 A CN104129869 A CN 104129869A
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- waste water
- stainless steel
- treatment process
- acid cleaning
- water treatment
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Abstract
The invention provides a stainless steel pickling wastewater treatment method comprising the following steps: (1) filtration and regulation are carried out, wherein large suspended matters in the pickling wastewater are removed by filtration, the wastewater is delivered to a regulation tank, wastewater quantity and quality are regulated, and the wastewater is pumped into a reaction sedimentation tank by using an anti-corrosive pump; (2) reaction sedimentation is carried out, wherein sodium sulfite, calcium hydroxide, and a flocculant are added into the reaction sedimentation tank, and a full reaction is allowed; (3) filtration is carried out, wherein the wastewater delivered from the sedimentation tank is filtered, sulfuric acid is added to a filtrate for regulating the pH value, and the water is discharged; and (4) sludge treatment is carried out, wherein the sludge obtained by filtration is dehydrated and delivered out. The method provided by the invention has the advantages of good effect, low investment, and simple operation.
Description
technical field:
The present invention relates to a kind of stainless steel acid cleaning waste water treatment process, belong to three industrial wastes processing technology field.
background technology:
Stainless steel is widely used because of its good erosion resistance and good outward appearance.Stainless steel in process of production, the courses of processing such as inevitably annealed, normalizing, quenching, welding, surface can produce the oxide skin of black often.Oxide skin not only affects stainless visual appearance, also can have a negative impact to the following process of product, therefore must adopt the surface treatment methods such as pickling, polishing to be removed before following process.The processing of a large amount of pickling waste waterss that all the time, produce in producing stainless steel process is difficult problems of iron and steel enterprise.Along with Iron And Steel Industry progressively develops, people recognize that pickling waste waters is to the particularly harm to mankind itself of environment gradually, and stainless steel acid cleaning waste water is to contain Cr
6+, Cr
3+with the acid waste water of metallic iron, nickel, Cr
3+in human body, belong to trace element, participate in glucose and lipid metabolism.But excessive Cr
3+easily accumulate in alveolar, cause lung cancer, enter and in human blood, cause hepatic and/or renal obstacle.Cr
6+there are very large stimulation and corrodibility.Epidemiological study shows: Cr
6+compound is common carcinogenic substance, inhales people and makes oxyphorase become methemoglobin to capturing partial oxygen in blood, and red corpuscle is taken mechanism of qi dysfunction, in generation, suffocates.During containing iron waste water row people water body, owing to having seized oxygen from water, just destroy fish, piscivorous animals and participated in the life condition of microorganism etc. of the self-purification of water, caused fish kills.Fluorine element can with animals and plants in plurality of enzymes have an effect, cause metabolism disorder, cytomorphosis, necrosis.Also can cause that spur, spinal canal stenosis appear in the excessive calcification of sclerotin, and this method processing of carcinogenesis stainless steel acid cleaning waste water, although to Cr
6+carried out neutralization, reduction, precipitation process, the chromium mud after pressure filter press filtration, still containing a small amount of Cr
6+, Cr
3+, environment is still had to larger harm, can only adopt antiseepage landfill.Because chromic toxicity is stronger, and can steady in a long-term exist, antiseepage landfill can not thoroughly be eliminated the potentially dangerous that high valence chrome works the mischief to environment, and landfill can increase processing cost, takies valuable land resources.Therefore, seek more reasonably processing approach and there is important theory and practical value.
summary of the invention:
The object of the invention is provides a kind of stainless steel acid cleaning waste water treatment process for the problem of above-mentioned existence, has that treatment effect is good, a less investment, the advantage such as easy and simple to handle.
Above-mentioned object is achieved through the following technical solutions:
Stainless steel acid cleaning waste water treatment process, the method comprises the steps:
(1) filter, regulate: after pickling waste waters is filtered out to large suspended substance, send into equalizing tank, the water quantity and quality of waste water is regulated, then adopt corrosion protection pump suction reaction settling basin;
(2) reaction precipitation: add S-WAT, calcium hydroxide, flocculation agent fully to react in reaction settling basin;
(3) filter: settling tank waste water is out filtered, and the rear filtrate of filtration adds sulfuric acid and carries out after pH value regulates discharging;
(4) sludge treatment: after the sludge dewatering after filtration, outward transport is processed.
Described stainless steel acid cleaning waste water treatment process, the water quantity and quality to waste water described in step (1) regulates, and is pickling waste waters to be stopped in equalizing tank to 8-10 hour.
Described stainless steel acid cleaning waste water treatment process, the add-on of the S-WAT described in step (2) is Cr
6+amount of substance 0.8-0.9 doubly.
Described stainless steel acid cleaning waste water treatment process, the add-on of the calcium hydroxide described in step (2) is Ni
2+, Cr
6+amount of substance summation 2.8-3.0 doubly.
Described stainless steel acid cleaning waste water treatment process, the flocculation agent described in step (2) adopts polyacrylamide flocculant.
Described stainless steel acid cleaning waste water treatment process, the filtration described in step (3) adopts pressure filter.
Described stainless steel acid cleaning waste water treatment process, it is to adopt sulfuric acid to be adjusted to pH value for neutral that the pH value described in step (3) regulates.
Beneficial effect:
Method of the present invention has that treatment effect is good, less investment, the advantage such as easy and simple to handle.
embodiment:
Stainless steel acid cleaning waste water treatment process, the method comprises the steps:
(1) filter, regulate: after pickling waste waters is filtered out to large suspended substance, send into equalizing tank, the water quantity and quality of waste water is regulated, then adopt corrosion protection pump suction reaction settling basin;
(2) reaction precipitation: add S-WAT, calcium hydroxide, flocculation agent fully to react in reaction settling basin; The add-on of described S-WAT is Cr
6+amount of substance 0.8-0.9 doubly.The add-on of described calcium hydroxide is Ni
2+, Cr
6+amount of substance summation 2.8-3.0 doubly.Concrete reaction is:
4Cr
6++3S
2O
5 2-+9H
2O=4Cr
3++6SO
4 2-+18H
+,
Cr
3++3OH
-=Cr(OH)
3↓；
Ni
2++2OH
-=?Ni?(OH)
2↓；
Ca
2++2F
-=CaF
2；
The bigger more theoretical consumption of reaction of dosing in the present embodiment, is convenient to occur sufficient reaction.Described flocculation agent adopts polyacrylamide flocculant.
(3) filter: settling tank waste water is out filtered, and the rear filtrate of filtration adds sulfuric acid and carries out after pH value regulates discharging;
(4) sludge treatment: after the sludge dewatering after filtration, outward transport is processed.
Described stainless steel acid cleaning waste water treatment process, the water quantity and quality to waste water described in step (1) regulates, and is pickling waste waters to be stopped in equalizing tank to 8-10 hour.
Described stainless steel acid cleaning waste water treatment process, the filtration described in step (3) adopts pressure filter.
Described stainless steel acid cleaning waste water treatment process, it is to adopt sulfuric acid to be adjusted to pH value for neutral that the pH value described in step (3) regulates.
Below be only most preferred embodiment of the present invention, method of the present invention includes but not limited to above-described embodiment, and unaccomplished matter of the present invention belongs to those skilled in the art's common practise.
Claims (7)
1. a stainless steel acid cleaning waste water treatment process, is characterized in that: the method comprises the steps:
(1) filter, regulate: after pickling waste waters is filtered out to large suspended substance, send into equalizing tank, the water quantity and quality of waste water is regulated, then adopt corrosion protection pump suction reaction settling basin;
(2) reaction precipitation: add S-WAT, calcium hydroxide, flocculation agent fully to react in reaction settling basin;
(3) filter: settling tank waste water is out filtered, and the rear filtrate of filtration adds sulfuric acid and carries out after pH value regulates discharging;
(4) sludge treatment: after the sludge dewatering after filtration, outward transport is processed.
2. stainless steel acid cleaning waste water treatment process according to claim 1, is characterized in that: the water quantity and quality to waste water described in step (1) regulates, and is pickling waste waters to be stopped in equalizing tank to 8-10 hour.
3. stainless steel acid cleaning waste water treatment process according to claim 1, is characterized in that: the add-on of the S-WAT described in step (2) is Cr
6+amount of substance 0.8-0.9 doubly.
4. stainless steel acid cleaning waste water treatment process according to claim 1, is characterized in that: the add-on of the calcium hydroxide described in step (2) is Ni
2+, Cr
6+amount of substance summation 2.8-3.0 doubly.
5. stainless steel acid cleaning waste water treatment process according to claim 1, is characterized in that: the flocculation agent described in step (2) adopts polyacrylamide flocculant.
6. stainless steel acid cleaning waste water treatment process according to claim 1, is characterized in that: the filtration described in step (3) adopts pressure filter.
7. stainless steel acid cleaning waste water treatment process according to claim 1, is characterized in that: it is to adopt sulfuric acid to be adjusted to pH value for neutral that the pH value described in step (3) regulates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410322188.1A CN104129869A (en) | 2014-07-08 | 2014-07-08 | Stainless steel pickling wastewater treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410322188.1A CN104129869A (en) | 2014-07-08 | 2014-07-08 | Stainless steel pickling wastewater treatment method |
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|---|---|
| CN104129869A true CN104129869A (en) | 2014-11-05 |
Family
ID=51802786
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| CN201410322188.1A Pending CN104129869A (en) | 2014-07-08 | 2014-07-08 | Stainless steel pickling wastewater treatment method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876011A (en) * | 2020-12-31 | 2021-06-01 | 中冶南方工程技术有限公司 | Mixed acid waste liquid treatment system |
| CN114988664A (en) * | 2022-05-27 | 2022-09-02 | 长三角(义乌)生态环境研究中心 | Photovoltaic waste acid liquid for preparing sludge conditioning agent and application thereof |
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| US20050258103A1 (en) * | 2001-05-30 | 2005-11-24 | Cort Steven L | Methods for removing heavy metals from water using chemical precipitation and field separation methods |
| CN101269871A (en) * | 2008-04-23 | 2008-09-24 | 南京大学 | Method for processing chrome wastewater |
| CN101633536A (en) * | 2008-07-21 | 2010-01-27 | 张通 | Method for treating small-size electroplating waste water |
| CN102070261A (en) * | 2009-11-24 | 2011-05-25 | 中国航空工业标准件制造有限责任公司 | Hexavalent chromium-containing waste water treatment method |
| CN102329024A (en) * | 2011-09-06 | 2012-01-25 | 中冶南方工程技术有限公司 | Treatment method for reducing Cr<6+> in stainless steel acid wastewater |
| CN202246306U (en) * | 2011-09-29 | 2012-05-30 | 常州豪邦纳米科技涂料有限公司 | Treatment system for chromate waste water |
| CN202542975U (en) * | 2012-04-09 | 2012-11-21 | 东营市东胜铸业有限责任公司 | Precious casting wastewater treatment system |
| CN103626322A (en) * | 2012-08-15 | 2014-03-12 | 宝钢特钢有限公司 | Double-alkali neutralization treatment method of heavy metal-containing acidic wastewater |
-
2014
- 2014-07-08 CN CN201410322188.1A patent/CN104129869A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050258103A1 (en) * | 2001-05-30 | 2005-11-24 | Cort Steven L | Methods for removing heavy metals from water using chemical precipitation and field separation methods |
| CN101269871A (en) * | 2008-04-23 | 2008-09-24 | 南京大学 | Method for processing chrome wastewater |
| CN101633536A (en) * | 2008-07-21 | 2010-01-27 | 张通 | Method for treating small-size electroplating waste water |
| CN102070261A (en) * | 2009-11-24 | 2011-05-25 | 中国航空工业标准件制造有限责任公司 | Hexavalent chromium-containing waste water treatment method |
| CN102329024A (en) * | 2011-09-06 | 2012-01-25 | 中冶南方工程技术有限公司 | Treatment method for reducing Cr<6+> in stainless steel acid wastewater |
| CN202246306U (en) * | 2011-09-29 | 2012-05-30 | 常州豪邦纳米科技涂料有限公司 | Treatment system for chromate waste water |
| CN202542975U (en) * | 2012-04-09 | 2012-11-21 | 东营市东胜铸业有限责任公司 | Precious casting wastewater treatment system |
| CN103626322A (en) * | 2012-08-15 | 2014-03-12 | 宝钢特钢有限公司 | Double-alkali neutralization treatment method of heavy metal-containing acidic wastewater |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876011A (en) * | 2020-12-31 | 2021-06-01 | 中冶南方工程技术有限公司 | Mixed acid waste liquid treatment system |
| CN114988664A (en) * | 2022-05-27 | 2022-09-02 | 长三角(义乌)生态环境研究中心 | Photovoltaic waste acid liquid for preparing sludge conditioning agent and application thereof |
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Application publication date: 20141105 |