CN103304067A - Method for removing nickel from high-concentration nickel-containing wastewater - Google Patents
Method for removing nickel from high-concentration nickel-containing wastewater Download PDFInfo
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Abstract
The invention relates to a method for removing nickel from high-concentration nickel-containing wastewater. The method comprises the following steps of: firstly, adjusting the pH of the wastewater to be 9.5-10.5 by using sodium hydroxide, adding polyaluminum chloride and stirring for 2-5 min, wherein the dosage of the polyaluminum chloride is that the concentration of the polyaluminum chloride is 50-500 ppm; then, adding trisodium thiocyanate trimer and stirring for 2-5 min, wherein the dosage of the trisodium thiocyanate trimer is that the concentration of the trisodium thiocyanate trimer is 10-100 ppm; and finally, adding negative ions, thoroughly stirring for 10-20 min, precipitating, filtering and detecting, wherein the dosage of the negative ions is that the concentration of the negative ions is 0.5-5 ppm. The method has the beneficial effects that the method has the advantages of low cost, low dosage, no secondary pollution, no production of odorous gases, and the like, and has a better removal effect on nickel of various forms in water, and the nickel removal ratio is high.
Description
Technical field
The present invention relates to the nickel-containing waste water treatment technology, relate in particular to a kind of method of removing the high density nickel-containing waste water.
Background technology
Nickel is one of nonferrous heavy metal in the discharge of wastewater, often contacts the nickel goods and can cause dermatitis, the strong toxicity of nickel salt, particularly nickle carbonoxide has very strong toxicity, because its easy volatilization is soluble in again fatty tissue, be easy to enter in the cytolemma, and very strong with the bonding force of protein and nucleic acid.Conventional nickel waste water treatment process has chemical method, physico-chemical process, chemical method mainly contains the methods such as neutralization precipitation method, flocculent precipitation, oxidation style, sulfide method, chemical method is as a kind for the treatment of process of nickel-containing waste water, but be not to adopt single processing mode, but the comprehensive treating process of several processing modes, this comprehensive treating process can improve the clearance of nickel, but because chemical method generally will add a large amount of chemical agents, and become sedimentary form and be precipitated out.
About the toxicity problem of nickel, be in harmony about the anti-of nickel waste water, the general plating needs a large amount of nickel and compounds thereof of using, and such as single nickel salt, nickel halogenide and metallic nickel etc., but the toxicity of nickel how, was not familiar with by many people in the past, it is generally acknowledged what toxicity it does not have.The scientific experiment of recent years shows, although the Oral toxicity of colloidal state nickel or nickel salt is lower, the compound of some nickel is considered to carcinogenic substance such as carbonyl nickel (CO) and nickel dirt.39 kinds (classes) that international cancer research institution (IARC) under the World Health Organization (WHO) announces in people's carcinogenic substance, nickel is listed in one of them.Therefore, be the harm of control nickel to the people, many countries have worked out the emission standard of nickel in the world.The highest permission emission concentration such as nickel in West Germany, the India's regulation waste water is 3 mg/L, Switzerland, Italy, Brazil are 2mg/L, Denmark is 0.2mg/L, the three industrial wastes blade row that China promulgated in 73 years is put the emission standard of standard nail piece processed, but after serve provinces and cities and industrial sector is created the emission standard of having ordered nickel successively, the highest permission discharging such as Chongqing regulation nickel is 5 mg/L, Liaoning then enters the different of function of water body according to naked degree forever with Sichuan, and emission standard is ordered between 0.5 ~ 1.5mg/L and 1 ~ 5 mg/L; The shipping industry then emission standard of regulation electronickelling waste water is l mg/L, and visible nickel is familiar with by people gradually to the harm of human body, and thinks and be necessary to be controlled.
In the medicament of existing processing nickel-containing waste water, generally be to use the most conventional sodium sulphite to join in the nickeliferous waste water, make the nickel in the water be reduced precipitation, make the nickel of removing in this way in the waste water, consumption greatly, also might make water body darken, cause secondary pollution, can produce gas odorous, nickel waste water to complex state there is no treatment effect, and cost performance is not high.Therefore, for above aspect, need to effectively innovate prior art.
Summary of the invention
For above defective, the invention provides a kind of with low cost, consumption is few, non-secondary pollution, without γ-ray emission odorous, to the nickel of various forms in the water body better removal effect is arranged, except the method for the high removal high density nickel-containing waste water of nickel rate.
For achieving the above object, the present invention is by the following technical solutions:
A kind of method of removing the high density nickel-containing waste water is comprised of following steps:
⑴ at first adopt sodium hydroxide to regulate wastewater pH to 9.5-10.5, adds polymerize aluminum chloride again and stirred 2-5 minute, and chemical feeding quantity is concentration 50-500ppm;
⑵ then process in the waste water that obtains at last in step (1), adds the trithiocyanuric acid trisodium salt and stirred 2-5 minute, and chemical feeding quantity is concentration 10-100ppm;
⑶ last, processes in the waste water that obtains at last in step (2), adds negatively charged ion and fully stirred 10-20 minute, and chemical feeding quantity is concentration 0.5-5ppm, and sedimentation and filtration detects.
For step (1), its best preferred version is that the chemical feeding quantity that adds polymerize aluminum chloride is concentration 200ppm.
For step (1), its preferred version is that the chemical feeding quantity that adds polymerize aluminum chloride is concentration 400ppm.
For step (2), its preferred version is that the chemical feeding quantity that adds the trithiocyanuric acid trisodium salt is concentration 40ppm.
For step (2), its preferred version is that the chemical feeding quantity that adds the trithiocyanuric acid trisodium salt is concentration 80ppm.
For step (3), its preferred version is that the chemical feeding quantity that adds negatively charged ion is concentration 2.5ppm.
For step (3), its preferred version is that the chemical feeding quantity that adds negatively charged ion is concentration 5ppm.
The beneficial effect of the method for removal high density nickel-containing waste water of the present invention is: have with low cost, consumption is few, non-secondary pollution, without advantages such as γ-ray emissions odorous, simultaneously, nickel to various forms in the water body has better removal effect, except the nickel rate can be up to 99.8%.
Embodiment
The method of the described removal high density of embodiment of the invention nickel-containing waste water at first, adopts sodium hydroxide to regulate wastewater pH to 9.5-10.5, adds polymerize aluminum chloride again and stirs, and chemical feeding quantity is concentration 50-500ppm; Then, add the trithiocyanuric acid trisodium salt and stir, chemical feeding quantity is concentration 10-100ppm; At last, add negatively charged ion and fully stir, chemical feeding quantity is concentration 0.5-5ppm, and sedimentation and filtration detects.
Embodiment 1
The method of the described removal high density of embodiment of the invention nickel-containing waste water mainly is comprised of following steps:
⑴ at first adopt sodium hydroxide to regulate wastewater pH to 9.6, adds polymerize aluminum chloride again and stirred 2-5 minute, and chemical feeding quantity is concentration 200ppm;
⑵ then add the trithiocyanuric acid trisodium salt and stirred 2-5 minute, and chemical feeding quantity is concentration 40ppm;
⑶ last, adds negatively charged ion and fully stirred 10-20 minute, and chemical feeding quantity is concentration 2.5ppm, precipitates 10-20 minute, refilters to detect to filter nickel content in the rear water.
Embodiment 2
The method of the described removal high density of embodiment of the invention nickel-containing waste water mainly is comprised of following steps:
⑴ at first adopt sodium hydroxide to regulate wastewater pH to 10.1, adds polymerize aluminum chloride again and stirred 2-5 minute, and chemical feeding quantity is concentration 400ppm;
⑵ then add the trithiocyanuric acid trisodium salt and stirred 2-5 minute, and chemical feeding quantity is concentration 80ppm;
⑶ last, adds negatively charged ion and fully stirred 10-20 minute, and chemical feeding quantity is concentration 5ppm, precipitates 10-20 minute, refilters to detect to filter nickel content in the rear water.
By above method, system only need to add sodium hydroxide, PAC and trithiocyanuric acid trisodium and negatively charged ion, can be with the content about 99.8% of nickel in the water body, in the treating processes without γ-ray emission odorous, cheap, consumption is few.
Above embodiment is more preferably one or more of embodiment of the present invention, the common variation that those skilled in the art carry out in the technical program scope and replace and should be included in protection scope of the present invention.
Claims (7)
1. a method of removing the high density nickel-containing waste water is characterized in that, is comprised of following steps:
⑴ at first adopt sodium hydroxide to regulate wastewater pH to 9.5-10.5, adds polymerize aluminum chloride again and stirred 2-5 minute, and chemical feeding quantity is concentration 50-500ppm;
⑵ then process in the waste water that obtains at last in step (1), adds the trithiocyanuric acid trisodium salt and stirred 2-5 minute, and chemical feeding quantity is concentration 10-100ppm;
⑶ last, processes in the waste water that obtains at last in step (2), adds negatively charged ion and fully stirred 10-20 minute, and chemical feeding quantity is concentration 0.5-5ppm, and sedimentation and filtration detects.
2. the method for removal high density nickel-containing waste water according to claim 1 is characterized in that: for step (1), its best preferred version is that the chemical feeding quantity that adds polymerize aluminum chloride is concentration 200ppm.
3. the method for removal high density nickel-containing waste water according to claim 1 is characterized in that: for step (1), its preferred version is that the chemical feeding quantity that adds polymerize aluminum chloride is concentration 400ppm.
4. the method for removal high density nickel-containing waste water according to claim 1 is characterized in that: for step (2), its preferred version is that the chemical feeding quantity that adds the trithiocyanuric acid trisodium salt is concentration 40ppm.
5. the method for removal high density nickel-containing waste water according to claim 1 is characterized in that: for step (2), its preferred version is that the chemical feeding quantity that adds the trithiocyanuric acid trisodium salt is concentration 80ppm.
6. the method for removal high density nickel-containing waste water according to claim 1, it is characterized in that: for step (3), its preferred version is that the chemical feeding quantity that adds negatively charged ion is concentration 2.5ppm.
7. the method for removal high density nickel-containing waste water according to claim 1, it is characterized in that: for step (3), its preferred version is that the chemical feeding quantity that adds negatively charged ion is concentration 5ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201310276138 CN103304067A (en) | 2013-07-03 | 2013-07-03 | Method for removing nickel from high-concentration nickel-containing wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201310276138 CN103304067A (en) | 2013-07-03 | 2013-07-03 | Method for removing nickel from high-concentration nickel-containing wastewater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103755067A (en) * | 2014-01-03 | 2014-04-30 | 上海丰信环保科技有限公司 | Treatment method for removing complex nickel out of wastewater |
| CN115490313A (en) * | 2022-11-16 | 2022-12-20 | 山东鲁净环保材料科技有限公司 | Flocculating agent for sewage treatment and preparation method thereof |
-
2013
- 2013-07-03 CN CN 201310276138 patent/CN103304067A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103755067A (en) * | 2014-01-03 | 2014-04-30 | 上海丰信环保科技有限公司 | Treatment method for removing complex nickel out of wastewater |
| CN115490313A (en) * | 2022-11-16 | 2022-12-20 | 山东鲁净环保材料科技有限公司 | Flocculating agent for sewage treatment and preparation method thereof |
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Application publication date: 20130918 |