CN105858973A - Hexavalent-chromium wastewater treatment technology - Google Patents
Hexavalent-chromium wastewater treatment technology Download PDFInfo
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- CN105858973A CN105858973A CN201610420585.1A CN201610420585A CN105858973A CN 105858973 A CN105858973 A CN 105858973A CN 201610420585 A CN201610420585 A CN 201610420585A CN 105858973 A CN105858973 A CN 105858973A
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- Prior art keywords
- chromium
- hexavalent
- waste water
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- wastewater
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a hexavalent-chromium wastewater treatment technology. The hexavalent-chromium wastewater treatment technology includes the steps that hexavalent chromium in wastewater is reduced to trivalent chromic ions through sodium hydrogen sulfite with the oxidation-reduction method, the PH value is adjusted, and trivalent chromium forms chromic hydroxide to be removed in a precipitation method accordingly. Compared with other treatment methods, the method is low in device investment and operating cost, easy to operate and suitable for hexavalent-chromium wastewater treatment of the electroplating industry, the printing and dyeing industry, the pharmaceutical industry, the light and textile industry, the chemical industry and the like, wastewater is sustainably treated on the spot, and pollution of the industry to the environment is reduced; meanwhile, the economic benefits of enterprises are increased, and the win-win effect is achieved.
Description
Technical field
The present invention relates to technical field of waste water processing, be specifically related to a kind of hexavalent chromium wastewater and process technique.
Background technology
At present, the domestic smeltings of intermetallic composite coating enterprise such as chromate waste water is mainly derived from metal plating industry, steel making industry
20 1 30 ten thousand tons of chromium slags of annual about discharge in gold and chemical industry.Harmful components in chromium slag be mainly solubility sodium chromate,
The hexavalent chromiums such as acid-soluble calcium chromate.Due to these Cr VIs and its pollution spread and constitute ecological environment of running off
Harm.Next to that the strong basicity harm of chromium slag.When chromium slag is stored up in the open, after long-term rain shower substantial amounts of Cr VI from
Son molten oozes with rainwater, run off, penetrates into earth's surface, thus polluted underground water, also pollute rivers, lake, and then endanger farmland, Aquatic product
And health.In the prior art, it is applied to process chromic mainly by membrane separation process with bioanalysis, but uses
Relatively costly, it is difficult to operation.
Summary of the invention
The invention provides a kind of hexavalent chromium wastewater and process technique, with solve processing cost that prior art exists higher and
The problem of troublesome poeration.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of hexavalent chromium wastewater processes technique, uses oxidation-reduction method, utilizes sodium sulfite by Cr VI in waste water also
Former one-tenth trivalent chromic ion, adjusts pH value, makes trivalent chromium form chromium hydroxide precipitation and removes, and concrete technology step is as follows:
(1) chromyl waste water is drained in wastewater equalization pond, uniformly mixes；
(2) hexavalent chromium wastewater of mix homogeneously is incorporated into acidification pool, is added thereto to add sulphuric acid and is acidified, control
PH value about 2.5；
(3), after pH value being transferred to about 2.5, add sodium sulfite and carry out reduction reaction, sodium sulfite and sexavalence
The mass ratio of chromium is 10:1 16:1, and reduction temperature is 20-40 DEG C, and the recovery time is 30-45 minute；
(4) waste water after reduction is incorporated in neutralization pond, is added thereto to sodium hydroxide and is neutralized, pH value is adjusted to
7.5-8.5；
(5) adding polyacrylamide in the waste water after neutralizing to precipitate, polyacrylamide addition is with chromic
Mass ratio is 10:3, and precipitation process temperature is 20-40 DEG C, and the sedimentation time is 20-30 minute.
The principle of the invention is: chromate waste water hexavalent chromium therein exists with the form of CrO42-in the basic conditions,
Exist with Cr2O72-form in acid condition.Common ground is all the chromium ion of sexavalence, can be with reducing agent by hexavalent chrome reduction
For trivalent chromium, then with in alkali and generate the chromium hydroxide precipitation of indissoluble and remove.
Cr (OH) 3 granules are comparatively fine, and settling velocity is relatively slow, can be solved by the method for coagulation.Coagulant can be selected for
Aluminium polychlorid, bodied ferric sulfate.The oxidation-reduction potential of Cr2O72-is+1.33 in acid medium, and half-reaction is as follows:
Cr2O72+14H+6e=2Cr++7H2O
In acid medium, chromium is strong oxidizer, and hexavalent chrome reduction can be trivalent by the electrode potential material less than 1.33
Chromium ion.The general material selected has NaHSO3, Na2SO3.They are as follows with the reaction of Cr6+:
2K2CrO7+6NaHSO3+5H2SO4=2Cr2 (SO4) 3+3Na2SO4+2K2SO4+8H2O
2K2CrO7+6Na2SO3+5H2SO4=2Cr2 (SO4) 3+3Na2SO4+2K2SO4+5H2O
Cr2(SO4)3+6NaOH→2Cr(OH)3↓+3NaSO4+H2O
The present invention compares the method equipment investment compared with other processing method and operating cost is relatively low, and simple to operate, scene can
Persistence processes waste water, it is adaptable to the hexavalent chromium wastewater of the industries such as electroplating industry and printing and dyeing, pharmacy, industry light industry textile industry, chemical industry processes,
Decreasing industry environmentally safe, the economic benefit of Ye Shi enterprise is improved the effect having reached doulbe-sides' victory simultaneously.
Detailed description of the invention
A kind of hexavalent chromium wastewater processes technique, uses oxidation-reduction method, utilizes sodium sulfite by Cr VI in waste water also
Former one-tenth trivalent chromic ion, adjusts pH value, makes trivalent chromium form chromium hydroxide precipitation and removes, and concrete technology step is as follows:
1, chromyl waste water is drained in wastewater equalization pond, uniformly mixes；
2, the hexavalent chromium wastewater of mix homogeneously is incorporated at acidification pool, (owing to the PH of every kind of high concentration chrome wastewater is the most different, adds
Dose is the most different, PH is transferred to acidity, depending on concrete chemical feeding quantity is according to different sewage so can only mention at this) add sulphuric acid
It is acidified, controls pH value about 2.5；
3, after pH value being transferred to about 2.5, NaHSO is added3Carrying out reduction reaction, chemical feeding quantity is 440mg/L (this dosing
Amount is the waste water of 300mg/L just for content of 6-valence Cr ions), reduction temperature is 20-40 DEG C, and the recovery time is 30-45 minute；
4, being incorporated in neutralization pond by the waste water after reduction, (owing to the pH value of every kind of high concentration chrome wastewater is the most different, chemical feeding quantity is also
Difference, is transferred to neutrality, depending on concrete chemical feeding quantity is according to different sewage so can only mention at this by PH) add sodium hydroxide enter
Row neutralizes, and tune pH value is 7.5-8.5,
5, adding polyacrylamide in the waste water after neutralizing to precipitate, chemical feeding quantity is 1000mg/L, and precipitation temperature is
20-40 DEG C, the sedimentation time is 20-30 minute.
The hexavalent chromium wastewater processing present invention process carries out detection test, test method: use magnetic stirring apparatus, test
Condition: mixing speed 150 revs/min, test water quality: on-the-spot chromate waste water (content of 6-valence Cr ions 297.54).
Test medicine:
Test method: water sample initiates PH:4.17, after adjustment PH to acidity, is initially added into reducing agent, recovery time
30min, then adjust PH to alkalescence, tiny Cr (OH) 3 precipitation can be produced at present, now need to add flocculant so that it is produce
Bigger floc sedimentation accelerates sedimentation effect and settling velocity, precipitate about 2 hours, detection chromium content, reach less than 0.5 be qualified.
Test consumption and result:
| Medicament | Dosing | Measurement result |
| NaHSO3 | 3.0 gram | 3.6mg/L |
| NaHSO3 | 3.5 gram | 1.8955mg/L |
| NaHSO3 | 4.0 gram | 1.2265mg/L |
| NaHSO3 | 4.2 gram | 0.27mg/L |
| NaHSO3 | 4.4 gram | 0.0mg/L |
| NaHSO3 | 6.0 gram | 0.0mg/L |
| Na2SO3 | 3.0 gram | 4.0mg/L |
| Na2SO3 | 3.5 gram | 2.145mg/L |
| Na2SO3 | 4.0 gram | 1.4385mg/L |
| Na2SO3 | 4.2 gram | 0.748mg/L |
| Na2SO3 | 4.4 gram | 0.174mg/L |
Conclusion (of pressure testing): can be seen that the clearance of the NaHSO3 clearance than Na2SO3 is high from the above.By seeing
Examine the structural formula of two kinds of medicaments and be appreciated that in the structural formula of NaHSO3 many H+ ions than in the structural formula of Na2SO3, pass through
The aqueous ph value that NaHSO3 is also learnt in concrete test is about 5.0, and the aqueous ph value of Na2SO3 is about 7.0.Aqueous solution
The medicament that pH value is low, promotes the pH value of waste water also to reduce after being dissolved in waste water, makes the process of reduction reaction obtain bigger
Raising.Why the clearance of NaHSO3 is better than Na2SO3.The consumption of NaHSO3 removal effect 4.4 grams when is
100%, water quality is now water white transparency, and consumption is when 4.2 grams, and chromium content is 0.27mg/L, although chromium content meet " sewage combine
Close discharge standard " primary standard in (GB 8,978 1996), the green but water quality is turned to be yellow the most a little, the most undesirable.
So for this water quality, consumption is when 4.4 grams, and effect is optimal.
The above-mentioned test carried out simply is carried out in the lab, and other material is less to the consumption of medicament, so in reality
Test dosage in room be clearance when 4.4 grams be 100%, but concrete dosage at the scene also needs to the concrete examination at scene
Test the dosage determining scene.
Claims (1)
1. hexavalent chromium wastewater processes a technique, it is characterized in that using oxidation-reduction method, utilizes sodium sulfite by waste water six
Valency chromium is reduced into trivalent chromic ion, adjusts pH value, makes trivalent chromium form chromium hydroxide precipitation and removes, and concrete technology step is as follows:
(1) chromyl waste water is drained in wastewater equalization pond, uniformly mixes；
(2) hexavalent chromium wastewater of mix homogeneously is incorporated into acidification pool, is added thereto to add sulphuric acid and is acidified, control pH value
2.5 left and right；
(3) after pH value being transferred to about 2.5, adding sodium sulfite and carry out reduction reaction, sodium sulfite is with chromic
Mass ratio is 10:1 16:1, and reduction temperature is 20-40 DEG C, and the recovery time is 30-45 minute；
(4) waste water after reduction is incorporated in neutralization pond, is added thereto to sodium hydroxide and is neutralized, pH value is adjusted to 7.5-
8.5；
(5) add polyacrylamide in the waste water after neutralizing to precipitate, polyacrylamide addition and chromic quality
Ratio is 10:3, and precipitation process temperature is 20-40 DEG C, and the sedimentation time is 20-30 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610420585.1A CN105858973A (en) | 2016-06-14 | 2016-06-14 | Hexavalent-chromium wastewater treatment technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610420585.1A CN105858973A (en) | 2016-06-14 | 2016-06-14 | Hexavalent-chromium wastewater treatment technology |
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| CN105858973A true CN105858973A (en) | 2016-08-17 |
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| CN201610420585.1A Pending CN105858973A (en) | 2016-06-14 | 2016-06-14 | Hexavalent-chromium wastewater treatment technology |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106167313A (en) * | 2016-08-18 | 2016-11-30 | 紫金矿业集团股份有限公司 | A kind of discoloration method of electroplating wastewater |
| CN106830268A (en) * | 2017-03-10 | 2017-06-13 | 青岛理工大学 | Method for reducing hexavalent chromium by using thiocyanide enhanced sulfite |
| CN109047288A (en) * | 2018-08-20 | 2018-12-21 | 湖南瀚洋环保科技有限公司 | Cr VI industrial hazard offal treatment technique and device |
| CN109456151A (en) * | 2017-09-06 | 2019-03-12 | 靳跃春 | The method for preparing the oxidant containing Cr VI |
| CN110156122A (en) * | 2018-11-02 | 2019-08-23 | 福建省隆辉环保工程有限公司 | Electroplating concentrated control zone sewage chromium mud recovery method |
| CN113121005A (en) * | 2021-05-21 | 2021-07-16 | 江苏理工学院 | Method for treating waste gas by using chromium-containing waste water |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5524577A (en) * | 1978-08-10 | 1980-02-21 | Nec Corp | Oxidation-reduction treatment method |
| CN101269871A (en) * | 2008-04-23 | 2008-09-24 | 南京大学 | Method for processing chrome wastewater |
| CN201250154Y (en) * | 2008-08-07 | 2009-06-03 | 常卫平 | Automatically controlled electroplating waste water treatment system |
| 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 |
-
2016
- 2016-06-14 CN CN201610420585.1A patent/CN105858973A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5524577A (en) * | 1978-08-10 | 1980-02-21 | Nec Corp | Oxidation-reduction treatment method |
| 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 |
| CN201250154Y (en) * | 2008-08-07 | 2009-06-03 | 常卫平 | Automatically controlled electroplating waste water treatment system |
| 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 |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106167313A (en) * | 2016-08-18 | 2016-11-30 | 紫金矿业集团股份有限公司 | A kind of discoloration method of electroplating wastewater |
| CN106167313B (en) * | 2016-08-18 | 2019-04-12 | 紫金矿业集团股份有限公司 | A kind of discoloration method of electroplating wastewater |
| CN106830268A (en) * | 2017-03-10 | 2017-06-13 | 青岛理工大学 | Method for reducing hexavalent chromium by using thiocyanide enhanced sulfite |
| CN109456151A (en) * | 2017-09-06 | 2019-03-12 | 靳跃春 | The method for preparing the oxidant containing Cr VI |
| CN109047288A (en) * | 2018-08-20 | 2018-12-21 | 湖南瀚洋环保科技有限公司 | Cr VI industrial hazard offal treatment technique and device |
| CN110156122A (en) * | 2018-11-02 | 2019-08-23 | 福建省隆辉环保工程有限公司 | Electroplating concentrated control zone sewage chromium mud recovery method |
| CN113121005A (en) * | 2021-05-21 | 2021-07-16 | 江苏理工学院 | Method for treating waste gas by using chromium-containing waste water |
| CN113121005B (en) * | 2021-05-21 | 2024-01-05 | 江苏理工学院 | Method for treating waste gas by using chromium-containing waste water |
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Ma Haiqing Inventor after: Chi Jinqing Inventor after: Li Chen Inventor after: Zhou Jingwei Inventor before: Ma Haiqing Inventor before: Li Chen Inventor before: Zhou Jingwei |
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Application publication date: 20160817 |