Method for removing nickel from high-concentration nickel-containing wastewater

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...

AI Technical Summary

Problems solved by technology

[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.