Method for removing nickel from high-concentration nickel-containing wastewater
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A high-concentration technology for nickel wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as secondary pollution, large consumption, and darkening of water body color, etc. Achieve the effect of no secondary pollution, good removal effect and low cost
Inactive Publication Date: 2013-09-18
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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[0005] In the existing medicaments for treating nickel-containing wastewater, the most conventional sodium sulfide is generally added to the nickel-containing wastewater, so that the nickel in the water is reduced and precipitated. Using this method to remove nickel in the wastewater requires a large amount, and there are It may make the water color darker, cause secondary pollution, and produce odorous gas. It has basically no treatment effect on complexed nickel wastewater, and the cost performance is not high.
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Embodiment 1
[0021] The method for removing high-concentration nickel-containing wastewater described in the embodiments of the present invention mainly consists of the following steps:
[0022] (1) First, use sodium hydroxide to adjust the pH of the wastewater to 9.6, then add polyaluminum chloride and stir for 2-5 minutes, and the dosage is 200ppm;
[0023] (2) Then, add trisodium thiocyanate and stir for 2-5 minutes, and the dosage is 40ppm;
[0024] (3) Finally, add anions and stir thoroughly for 10-20 minutes, the dosage is 2.5ppm, precipitate for 10-20 minutes, and then filter to detect the nickel content in the filtered water.
Embodiment 2
[0026] The method for removing high-concentration nickel-containing wastewater described in the embodiments of the present invention mainly consists of the following steps:
[0027] (1) First, adjust the pH of the wastewater to 10.1 with sodium hydroxide, then add polyaluminum chloride and stir for 2-5 minutes, and the dosage is 400ppm;
[0028] (2) Then, add trisodium thiocyanate and stir for 2-5 minutes, and the dosage is 80ppm;
[0029] (3) Finally, add anions and stir thoroughly for 10-20 minutes, the dosage is 5ppm, precipitate for 10-20 minutes, and then filter to detect the nickel content in the filtered water.
[0030] Through the above method, the system only needs to add sodium hydroxide, PAC, trisodium thiocyanate and anions to reduce the nickel content in the water by about 99.8%. There is no odorous gas generated during the treatment process, and the price is low. Use less.
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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
[0001] technical field [0002] The invention relates to nickel-containing wastewater treatment technology, in particular to a method for removing high-concentration nickel-containing wastewater. Background technique [0003] Nickel is one of the non-ferrous heavy metals in wastewater discharge. Regular contact with nickel products can cause skin inflammation. Nickel salts are highly toxic, especially nickel carbonyl, which is very toxic because it is easy to volatilize and dissolve in fat tissue, so it is easy to enter In the cell membrane, it has a strong binding force with proteins and nucleic acids. Conventional nickel wastewater treatment processes include chemical method and physicochemical method. Chemical methods mainly include neutralization precipitation method, flocculation precipitation method, oxidation method, sulfide method and other methods. Chemical method is a treatment method for nickel-containing wastewater, but it is not A single treatment method is ado...
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