Method for treating high-concentration nickel-containing wastewater by adjusting pH value

A technology for high-concentration nickel wastewater, applied in water/sewage treatment, chemical instruments and methods, neutralized water/sewage treatment, etc., can solve the problems of unreachable effect, waste of resources, and increased cost, and achieve better nickel removal effect Good, less dosing, saving resources

Inactive Publication Date: 2013-10-23
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the existing agents for treating nickel-containing wastewater, you may know that pH has an impact on nickel removal, but you don’t know what the optimal pH for nickel removal is, so many of them remove nickel by adding more agents, which cannot achieve the effect. and waste of resources, cost increase

Method used

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Examples

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Effect test

Embodiment 1

[0017] The method for treating high-concentration nickel-containing wastewater by adjusting the pH value described in the embodiments of the present invention mainly consists of the following steps:

[0018] (1) First, use sodium hydroxide to adjust the pH of the wastewater to 7.5-8.5, then add polyaluminum chloride and stir for 2-5 minutes, and the dosage is 400ppm;

[0019] (2) Then, add trisodium thiocyanate and stir for 2-5 minutes, and the dosage is 80ppm;

[0020] (3) Finally, add anion 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, and the nickel content can be obtained as 0.23mg / l.

Embodiment 2

[0022] The method for treating high-concentration nickel-containing wastewater by adjusting the pH value described in the embodiments of the present invention mainly consists of the following steps:

[0023] (1) First, use sodium hydroxide to adjust the pH of the wastewater to 8.5-9.5, then add polyaluminum chloride and stir for 2-5 minutes, and the dosage is 400ppm;

[0024] (2) Then, add trisodium thiocyanate and stir for 2-5 minutes, and the dosage is 80ppm;

[0025] (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, and the nickel content can be obtained as 0.1mg / l.

Embodiment 3

[0027] The method for treating high-concentration nickel-containing wastewater by adjusting the pH value described in the embodiments of the present invention mainly consists of the following steps:

[0028] (1) First, use sodium hydroxide to adjust the pH of the wastewater to 9.5-10.5, then add polyaluminum chloride and stir for 2-5 minutes, and the dosage is 400ppm;

[0029] (2) Then, add trisodium thiocyanate and stir for 2-5 minutes, and the dosage is 80ppm;

[0030] (3) Finally, add anion 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, and the nickel content can be obtained as 0.06mg / l.

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PUM

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Abstract

The invention relates to a method for treating high-concentration nickel-containing wastewater by adjusting the pH value. The method comprises the following steps of: (1) adjusting the pH value of the wastewater to 7.5-8.5 by using sodium hydroxide, adding aluminium polychlorid, and stirring for 2-5 minutes, wherein the concentration of the added aluminium polychlorid is 400ppm; (2) adding sodium tripolythiocyanate, and stirring for 2-5 minutes, wherein the concentration of the added sodium tripolythiocyanate is 80ppm; and (3) adding an anion, stirring fully for 10-20 minutes, precipitating for 10-20 minutes, filtering and finally detecting the content of nickel in the wastewater, wherein the concentration of the added anion is 5ppm. By finding out the optimum pH value of the wastewater to remove nickel, the addition amount of drugs can be reduced, resources can be saved, and a better nickel removal effect can be achieved.

Description

technical field [0001] The invention relates to nickel-containing wastewater treatment technology, in particular to a method for treating high-concentration nickel-containing wastewater by adjusting the pH value. Background technique [0002] Nickel is one of the non-ferrous heavy metals in wastewater discharge. The conventional nickel wastewater treatment process includes chemical method and physicochemical method. Chemical methods mainly include neutralization precipitation method, flocculation precipitation method, oxidation method, sulfide method and other methods. A treatment method for wastewater, but due to the chemical method, a large amount of chemical agents are generally added and precipitated in the form of sediment. [0003] Regarding the toxicity of nickel and the prevention of nickel wastewater, generally electroplating requires a large amount of nickel and its compounds, such as nickel sulfate, nickel halide and metallic nickel. Scientific experiments in rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66C02F1/62
Inventor 夏志先
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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