CN102583860A - Novel steel quality inspection wastewater treatment method - Google Patents
Novel steel quality inspection wastewater treatment method Download PDFInfo
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- CN102583860A CN102583860A CN2012100372645A CN201210037264A CN102583860A CN 102583860 A CN102583860 A CN 102583860A CN 2012100372645 A CN2012100372645 A CN 2012100372645A CN 201210037264 A CN201210037264 A CN 201210037264A CN 102583860 A CN102583860 A CN 102583860A
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Abstract
The invention belongs to the field of wastewater treatment and discloses a novel steel quality inspection wastewater treatment method, mainly comprising the following steps of: firstly, adding an alkaline adjusting agent such as calcium oxide, calcium hydroxide or sodium hydroxide to carry out neutralization reaction to treat wastewater, thereby adjusting partial pH on one hand and providing a suitable reaction condition for a subsequence oxidization-reduction reaction on the other hand; then, adding sodium metabisulfite to have oxidization-reduction reaction with chromium in the wastewater; then, continuously adding the alkaline adjusting agent, adjusting pH to be alkaline and removing metal ions in a form of hydroxide precipitation; and finally, realizing solid-liquid separation through a reduced pressure distillation way, wherein obtained distillate meets the requirements of Emission Standard of Iron and Steel Industry Waster Pollutants on the aspects of COD (Chemical Oxygen Demand), pH, metal ion content, chlorine ion content and the like.
Description
Technical field
The invention belongs to field of waste water treatment, relate to a kind of new iron and steel quality inspection method of wastewater treatment, especially to the strongly-acid, the high-concentration metallic ions wastewater treatment method that are produced in the iron and steel quality inspection process.
Background technology
The quality inspection center of Iron And Steel Company is when carrying out various analyzing and testing to iron and steel starting material and finished product; Need a large amount of strongly-acid reagent such as sulfuric acid, hydrochloric acid, hydrofluoric acid that use, consequent waste liquor PH is extremely low, generally is about 0.4～0.6; COD is then up to about 8000～10000mg/L; Iron ion also is higher than " Iron And Steel Industry pollution discharge standard " requirement far away with the concentration of total chromium, in addition chlorine ion concentration then more than 10000mg/L, but this waste water generation is less; General every month generation is 1000～2000L, how this type waste water is carried out thoroughly, is treated as safely one of the difficult problem at puzzlement quality inspection center.
The various steel wastewaters of finding are handled related patent U.S. Patent No. and are mainly concentrated on the waste water that is produced in ore dressing, the smelting at present; The reaction of employing acid-base neutralisation is regulated pH on the one hand, forms precipitate metal hydroxides on the other hand and removes metals ion; And utilize aeration or ozone oxidation mode to remove COD; But the iron and steel waste liquid water COD that these methods are handled all is lower than 1000mg/L, and metal ion content is also lower, does not more relate to the processing of strong acid and high-concentration chlorine ion in the waste water.
Summary of the invention
The present invention is in order to solve above-mentioned deficiency, and purpose is to provide a kind of method that the waste water advanced processing of iron and steel quality inspection is carried out in soda acid neutralization reaction, redox reaction and underpressure distillation of uniting.
The object of the invention can be realized through following technical scheme:
A kind of new iron and steel quality inspection method of wastewater treatment is characterized in that comprising successively following steps:
(1) iron and steel quality inspection waste water is mixed with alkaline conditioner, carry out neutralization reaction, regulate pH to 2.5～3.2;
(2) add Sodium Metabisulfite, carry out redox reaction with chromium in the waste water;
(3) add alkaline conditioner once more, carry out neutralization reaction, regulate pH to 7.5～8.5;
(4) pretreated waste water that obtains of pre-heating step (3);
(5) waste water after the preheating changes in the vacuum distillation apparatus, carries out underpressure distillation, the distillate qualified discharge.
Wherein, the described alkaline conditioner of step (1) is a kind of to multiple in sodium hydroxide, calcium hydroxide and the quicklime, 5～10 minutes described neutralization reaction time.
It is 2.5～3.7 times of total chromium quality in the handled waste water that the described Sodium Metabisulfite of step (2) adds quality, and the reaction times is 30～45 minutes.Described total chromium quality is meant according to the said method of national standard " the mensuration GB 7466-1987 of the total chromium of water quality " measures total chromium concn in the waste water, multiply by total chromium concn through wastewater volume then and calculates.
The described alkaline conditioner of step (3) is sodium hydroxide or calcium hydroxide, 5～10 minutes described neutralization reaction time.
The described preheating of step (4), its temperature is controlled at 65～70 ℃, and be 25～30 minutes warm up time.
The described underpressure distillation of step (5), its vacuum tightness is 10～15kPa, distillation temperature is 65～72 ℃, is distilled to the distillate volume and is till the raw wastewater volume 90%.The neutralization reaction that the said the first step is carried out, the alkaline conditioner of selecting for use are a kind of to multiple in sodium hydroxide, calcium hydroxide and the quicklime, regulate pH to 2.5～3.2,5～10 minutes reaction times.
The invention has the beneficial effects as follows: the present invention is through associating soda acid neutralization reaction, redox reaction and underpressure distillation treatment process; Can make " Iron And Steel Industry pollution discharge standard " requirement (GB13456-1992) that is up to state standards of iron and steel quality inspection waste water COD (COD), pH, Fe (iron), chromium (Cr) concentration at short notice; In addition Cl in the waste water (chlorine) is also handled; Have and handle thorough, quick, effective advantage; For the processing of iron and steel quality inspection waste water provides a kind of new approach, also be applicable to the processing of other high density steel wastewaters simultaneously.
Embodiment
The present invention does further detailed description below in conjunction with embodiment to concrete measure mode of the present invention:
Embodiment 1:
1, get the iron and steel quality inspection waste water 200L of discharging, its pH is 0.50, and COD is 8200mg/L, iron ion content 400mg/L, total chrome content 35.7mg/L.Add calcium hydroxide 6.5kg, stirring reaction 10 minutes, pH regulator to 2.65;
2, add Sodium Metabisulfite 21.4g, continued stirring reaction 30 minutes;
3, add calcium hydroxide 5.5kg once more, stirring reaction 10 minutes, pH regulator to 8.2;
4, the above-mentioned waste liquid to 65 of preheating ℃ kept 25 minutes;
5, the preheating waste liquid is all changed in the vacuum distillation apparatus, vacuum tightness 15kPa, temperature adds thermal distillation for 68 ℃, stops during to 180L until distillate.
6, COD, pH, iron ion, total chromium and chlorine ion concentration are as shown in table 1 in mensuration raw wastewater and the distillate.
Each item index in table 1 raw wastewater and the distillate
| COD(mg/L) | pH | Iron (mg/L) | Total chromium (mg/L) | Cl ions (mg/L) | |
| Raw wastewater | 8200 | 0.50 | 400 | 35.7 | 2130 |
| Distillate | 30 | 7.8 | 0.1 | 0.027 | 25 |
Embodiment 2:
1, get the iron and steel quality inspection waste water 200L of discharging, wherein pH is 0.62, and COD is 9000mg/L, iron ion content 460mg/L, and total chrome content 32.5mg/L adds sodium hydroxide 8.1kg, stirring reaction 10 minutes, pH regulator to 2.5;
2, add Sodium Metabisulfite 23.6g, continued stirring reaction 40 minutes
3, add sodium hydroxide 6.7kg once more, stirring reaction 10 minutes, pH regulator to 8.5;
4, the above-mentioned waste liquid to 70 of preheating ℃ kept 30 minutes
5, the preheating waste liquid is all changed in the vacuum distillation apparatus, vacuum tightness 10kPa, temperature adds thermal distillation for 63 ℃, stops during to 180L until distillate.
6, COD, pH, iron ion, total chromium and chlorine ion concentration are as shown in table 2 in mensuration raw wastewater and the distillate.
Each item index in table 2 raw wastewater and the distillate
| COD(mg/L) | pH | Iron (mg/L) | Total chromium (mg/L) | Cl ions (mg/L) | |
| Raw wastewater | 9000 | 0.62 | 460 | 32.5 | 2380 |
| Distillate | 42 | 8.0 | 0.3 | 0.020 | 19 |
Embodiment 3:
1, get the iron and steel quality inspection waste water 300L of discharging, wherein pH is 0.48, and COD is 8500mg/L, iron ion content 480mg/L, and total chrome content 30.8mg/L adds quicklime 9.8kg, stirring reaction 10 minutes, pH regulator to 3.0;
2, add Sodium Metabisulfite 28.2g, continued stirring reaction 45 minutes
3, add calcium hydroxide 5.6kg once more, stirring reaction 5 minutes, pH regulator to 7.8;
4, the above-mentioned waste liquid to 68 of preheating ℃ kept 28 minutes;
5, the preheating waste liquid is all changed in the vacuum distillation apparatus, vacuum tightness 12kPa, temperature adds thermal distillation for 65 ℃, stops during to 270L until distillate.
6, COD, pH, iron ion, total chromium and chlorine ion concentration are as shown in table 3 in mensuration raw wastewater and the distillate.
Each item index in table 3 raw wastewater and the distillate
| COD(mg/L) | pH | Iron (mg/L) | Total chromium (mg/L) | Cl ions (mg/L) | |
| Raw wastewater | 8500 | 0.48 | 480 | 30.8 | 2210 |
| Distillate | 30 | 7.5 | 0.3 | 0.032 | 27 |
Claims (6)
1. new iron and steel quality inspection method of wastewater treatment is characterized in that comprising successively following steps:
(1) iron and steel quality inspection waste water is mixed with alkaline conditioner, carry out neutralization reaction, regulate pH to 2.5～3.2;
(2) add Sodium Metabisulfite, carry out redox reaction with chromium in the waste water;
(3) add alkaline conditioner once more, carry out neutralization reaction, regulate pH to 7.5～8.5;
(4) pretreated waste water that obtains of pre-heating step (3);
(5) waste water after the preheating changes in the vacuum distillation apparatus, carries out underpressure distillation, the distillate qualified discharge.
2. iron and steel quality inspection method of wastewater treatment according to claim 1 is characterized in that the described alkaline conditioner of step (1) is a kind of to multiple in sodium hydroxide, calcium hydroxide and the quicklime, 5～10 minutes described neutralization reaction time.
3. iron and steel quality inspection method of wastewater treatment according to claim 1 is characterized in that it is 2.5～3.7 times of total chromium quality in the handled waste water that the described Sodium Metabisulfite of step (2) adds quality, and the reaction times is 30～45 minutes.
4. iron and steel quality inspection method of wastewater treatment according to claim 1 is characterized in that the described alkaline conditioner of step (3) is sodium hydroxide or calcium hydroxide, 5～10 minutes described neutralization reaction time.
5. iron and steel quality inspection method of wastewater treatment according to claim 1 is characterized in that the described preheating of step (4), and its temperature is controlled at 65～70 ℃, and be 25～30 minutes warm up time.
6. iron and steel quality inspection method of wastewater treatment according to claim 1 is characterized in that the described underpressure distillation of step (5), and its vacuum tightness is 10～15kPa, and distillation temperature is 65～72 ℃, is distilled to the distillate volume and is till the raw wastewater volume 90%.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015076773A1 (en) * | 2013-11-21 | 2015-05-28 | Олег Игоревич NOSOVSKYI OLEG I. ul. Nikolsko-Botanicheskaya 17/19 kv. 60 Kiev 01033 НОСОВСКИЙ | Method for cleaning industrial water and wastewater of chromium compounds |
| CN104986887A (en) * | 2015-06-03 | 2015-10-21 | 马钢(集团)控股有限公司 | Innocent treatment method for waste metal defect detection liquid |
| CN106966542A (en) * | 2017-05-31 | 2017-07-21 | 覃祖勇 | The processing method of steel wastewater |
| CN107032545A (en) * | 2017-05-31 | 2017-08-11 | 覃祖勇 | Steel waste water treating agent and processing method |
| CN107089754A (en) * | 2017-05-31 | 2017-08-25 | 覃祖勇 | Steel wastewater immediate processing method |
| CN107151078A (en) * | 2017-05-31 | 2017-09-12 | 覃祖勇 | Steel wastewater processing method |
| CN107151077A (en) * | 2017-05-31 | 2017-09-12 | 覃祖勇 | Composition and method for steel wastewater processing |
| CN108726777A (en) * | 2018-06-12 | 2018-11-02 | 苏州诚华工程管理咨询有限公司 | Chrome waste liquid treatment process |
Citations (1)
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| 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 |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Non-Patent Citations (1)
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| 张弘等: "浅谈压力驱动膜在冶金工业上的应用", 《功能材料》, vol. 33, no. 6, 31 December 2002 (2002-12-31) * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015076773A1 (en) * | 2013-11-21 | 2015-05-28 | Олег Игоревич NOSOVSKYI OLEG I. ul. Nikolsko-Botanicheskaya 17/19 kv. 60 Kiev 01033 НОСОВСКИЙ | Method for cleaning industrial water and wastewater of chromium compounds |
| CN104986887A (en) * | 2015-06-03 | 2015-10-21 | 马钢(集团)控股有限公司 | Innocent treatment method for waste metal defect detection liquid |
| CN106966542A (en) * | 2017-05-31 | 2017-07-21 | 覃祖勇 | The processing method of steel wastewater |
| CN107032545A (en) * | 2017-05-31 | 2017-08-11 | 覃祖勇 | Steel waste water treating agent and processing method |
| CN107089754A (en) * | 2017-05-31 | 2017-08-25 | 覃祖勇 | Steel wastewater immediate processing method |
| CN107151078A (en) * | 2017-05-31 | 2017-09-12 | 覃祖勇 | Steel wastewater processing method |
| CN107151077A (en) * | 2017-05-31 | 2017-09-12 | 覃祖勇 | Composition and method for steel wastewater processing |
| CN108726777A (en) * | 2018-06-12 | 2018-11-02 | 苏州诚华工程管理咨询有限公司 | Chrome waste liquid treatment process |
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Effective date of registration: 20190611 Address after: Room 512, Technology Business Incubator Innovation Building, Venture Service Center, Longwan High-tech Industrial Development Zone, Wenzhou City, Zhejiang Province Patentee after: Chuangsheng Quantum Technology (Wenzhou) Co., Ltd. Address before: 211135 No. 666 Dongqilu Road, Qilin Science and Technology Venture Park, Nanjing City, Jiangsu Province Patentee before: Cascade Clean Energy, Inc. Jiangsu |
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