CN104211222A - Treatment method of hexavalent chromium-containing wastewater - Google Patents
Treatment method of hexavalent chromium-containing wastewater Download PDFInfo
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- CN104211222A CN104211222A CN201410444849.8A CN201410444849A CN104211222A CN 104211222 A CN104211222 A CN 104211222A CN 201410444849 A CN201410444849 A CN 201410444849A CN 104211222 A CN104211222 A CN 104211222A
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- hexavalent chromium
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Abstract
The invention relates to a treatment method of hexavalent chromium-containing wastewater. The method comprises the following steps: (1) firstly, adding H2SO4 to adjust the pH value of the wastewater to 2.0-3.0; (2) then adding 40-400ppm of aluminum zirconium column supported montmorillonite and stirring for 7 minutes; (3) finally, adding 0.5-5ppm of anions and stirring for 17 minutes and precipitating for 17 minutes; and (4) filtering and measuring the content of hexavalent chromium in water. The method provided by the invention has the beneficial effects that by firstly adding H2SO4 to adjust the pH value of the wastewater to 2.0-3.0, then sequentially adding the aluminum zirconium column supported montmorillonite and anions and stirring and finally precipitating, filtering and detecting, the method is simple to operate, short in flow, small in occupied area of a project and low in operating cost of capital construction.
Description
Technical field
The present invention relates to wastewater processing technology, particularly relate to a kind for the treatment of process containing hexavalent chromium wastewater.
Background technology
A series of industries such as the production of metallurgy, chemical industry, mineral engineering, plating, chromium processed, pigment, pharmacy, industry light industry textile industry, chromic salts and chromium compounds, all can produce a large amount of chromate waste waters.The compound of chromium with divalence (as CrO), trivalent (as Cr
2o
3) and sexavalence (as CrO
3) form exist, but the most common with the compound of trivalent and sexavalence.Its toxicity is then strong with sexavalent chrome, and be about chromic 100 times, trivalent chromium takes second place, and bivalent chromium and the toxicity of chromium own is very little or nontoxicity.
Chromium compounds invades human body by digestive tube, respiratory tract, skin and mucous membrane, mainly accumulate in liver, kidney, endocrine system and lung, toxicological effect affects substance in vivo oxidation, reduction and hydrolytic process, is combined affects the phosphorus content in organizing with nucleic acid, nucleoprotein.Chromium cpd has carcinogenesis, and chromium cpd enters in tissue in the mode of steam and dust, metabolism and the speed that is eliminated slow, perforation of nasal septum can be caused, stomach illness, white cell decline, the pulmonary lesion of similar asthma." chrome ulcer " that skin contact chromium compounds can cause healing extremely slow.Chromium in water can accumulate in the bone of fish, and now Cr3+ is also larger than the toxicity of Cr6+, and concentration is that namely 3.0 mg/ L have lethal effect to fresh-water fishes; Concentration is 0.01mg/L, and some hydrobionts just can be made lethal, and the self-purification of water body is suppressed.If with the rural sewage disposal farm containing chromium, chromium is just in plant materials inner accumulated, and the digestion of soil with organic matter is suppressed, and causes the agriculture underproduction.The pollution of chromium is mainly caused by industry; Therefore, various countries are to the chromium content of the waste water discharged, fisheries water water quality, field irrigation water quality, the surface water and tap water, and all there are strict requirements, and China has been defined as sexavalent chrome one of index implementing overall control.Therefore, manage to control and administer the pollution containing hexavalent chromium wastewater and seem very important and urgent.
In the method for existing process containing hexavalent chromium wastewater, generally first adjust pH to acid, add reductive agent again and hexavalent chrome reduction is become trivalent chromium, then by regulating pH to precipitate chromium to alkalescence, process contains hexavalent chromium wastewater complicated operation, long flow path like this, project occupation of land area is large, capital construction working cost is high.Thus, need effectively to innovate prior art.
Summary of the invention
For above defect, the invention provides a kind of simple to operate, flow process is short, project occupation of land area is little, capital construction working cost is low containing the treatment process of hexavalent chromium wastewater, to solve many deficiencies of existing wastewater processing technology.
For achieving the above object, the present invention is by the following technical solutions:
Containing a treatment process for hexavalent chromium wastewater, be made up of following steps:
(1) first, first add H
2sO
4regulate waste water ph to 2.0-3.0;
(2) the aluminium zirconium pillared montmorillonite adding 40-400ppm again stirs 7 minutes;
(3) last, add 0.5-5ppm negatively charged ion and stir 17 minutes, precipitate 17 minutes;
(4) filter, survey the content of 6-valence Cr ions in water after filtering.
The aluminium zirconium pillared montmorillonite value added is 40ppm;
The aluminium zirconium pillared montmorillonite value added is 200ppm;
The aluminium zirconium pillared montmorillonite value added is 400ppm.
Beneficial effect of the present invention is: the method first adds H2SO4 and regulates wastewater pH to 2.0-3.0, add aluminium zirconium pillared montmorillonite more successively, negatively charged ion stirs, last sedimentation and filtration detects, and the method is simple to operate, flow process is short, project occupation of land area is little, capital construction working cost is low.
Embodiment
embodiment 1
The treatment process containing hexavalent chromium wastewater described in the embodiment of the present invention, forms primarily of following steps:
(1) first, first add H
2sO
4regulate waste water ph to 2.0-3.0;
(2) the aluminium zirconium pillared montmorillonite adding 40ppm again stirs 7 minutes;
(3) last, add 3ppm negatively charged ion and stir 17 minutes, precipitate 17 minutes;
(4) filter, survey the content of 6-valence Cr ions in water after filtering, the clearance of chromium is 81.2%.
embodiment 2
The treatment process containing hexavalent chromium wastewater described in the embodiment of the present invention, forms primarily of following steps:
(1) first, first add H
2sO
4regulate waste water ph to 2.0-3.0;
(2) the aluminium zirconium pillared montmorillonite adding 200ppm again stirs 7 minutes;
(3) last, add 3ppm negatively charged ion and stir 17 minutes, precipitate 17 minutes;
(4) filter, survey the content of 6-valence Cr ions in water after filtering, the clearance of chromium is 92.3%.
embodiment 3
The treatment process containing hexavalent chromium wastewater described in the embodiment of the present invention, forms primarily of following steps:
(1) first, first add H
2sO
4regulate waste water ph to 2.0-3.0;
(2) the aluminium zirconium pillared montmorillonite adding 400ppm again stirs 7 minutes;
(3) last, add 3ppm negatively charged ion and stir 17 minutes, precipitate 17 minutes;
(4) filter, survey the content of 6-valence Cr ions in water after filtering, the clearance of chromium is 99.3%.
Above embodiment is the several of the present invention's more preferably embodiment, and the usual change that those skilled in the art carry out within the scope of the technical program and replacing should be included in protection scope of the present invention.
Claims (4)
1., containing a treatment process for hexavalent chromium wastewater, it is characterized in that, be made up of following steps:
(1) first, first add H
2sO
4regulate waste water ph to 2.0-3.0;
(2) the aluminium zirconium pillared montmorillonite adding 40-400ppm again stirs 7 minutes;
(3) last, add 0.5-5ppm negatively charged ion and stir 17 minutes, precipitate 17 minutes;
(4) filter, survey the content of 6-valence Cr ions in water after filtering.
2. the treatment process containing hexavalent chromium wastewater according to claim 1, is characterized in that: the aluminium zirconium pillared montmorillonite value added is 40ppm.
3. the treatment process containing hexavalent chromium wastewater according to claim 1, is characterized in that: the aluminium zirconium pillared montmorillonite value added is 200ppm.
4. the treatment process containing hexavalent chromium wastewater according to claim 1, is characterized in that: the aluminium zirconium pillared montmorillonite value added is 400ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410444849.8A CN104211222A (en) | 2014-09-03 | 2014-09-03 | Treatment method of hexavalent chromium-containing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410444849.8A CN104211222A (en) | 2014-09-03 | 2014-09-03 | Treatment method of hexavalent chromium-containing wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104211222A true CN104211222A (en) | 2014-12-17 |
Family
ID=52093189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410444849.8A Pending CN104211222A (en) | 2014-09-03 | 2014-09-03 | Treatment method of hexavalent chromium-containing wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105000709A (en) * | 2015-07-09 | 2015-10-28 | 芜湖仅一机械有限公司 | Sewage treatment method |
-
2014
- 2014-09-03 CN CN201410444849.8A patent/CN104211222A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105000709A (en) * | 2015-07-09 | 2015-10-28 | 芜湖仅一机械有限公司 | Sewage treatment method |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141217 |