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Treatment method for removing complex nickel out of wastewater

A treatment method and technology for nickel wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve the best treatment effect, high nickel removal rate, and high cost performance.

Inactive Publication Date: 2014-04-30
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above defects, the present invention provides a low dosage, and at the same time has a better treatment effect on various forms of nickel in the water body, no secondary pollution, no darkening of the water body, no toxic gas generation, and high cost performance , A treatment method for removing complexed nickel-containing wastewater with high nickel removal rate to solve many deficiencies in existing wastewater treatment technologies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The treatment method of removing the wastewater containing complexed nickel described in the embodiments of the present invention mainly consists of the following steps:

[0018] (1) First, add hydrochloric acid to adjust the pH of the wastewater to 2.0-3.0;

[0019] (2) Then add 300ppm sodium hypochlorite and stir for 2-5 minutes;

[0020] (3) Then, add sodium hydroxide to adjust the pH of the wastewater to 9.5-10.5;

[0021] (4) Add 80ppm of PAC polyaluminum chloride and stir for 2-5 minutes;

[0022] (5) Then add 40ppm trisodium thiocyanate and stir for 2-5 minutes;

[0023] ⑹Finally, add 3ppm anion and stir for 10-20 minutes, precipitate for 10-20 minutes, filter, and measure the nickel content in the filtered water.

Embodiment 2

[0025] It mainly consists of the following steps:

[0026] (1) First, add hydrochloric acid to adjust the pH of the wastewater to 2.0-3.0;

[0027] (2) Then add 600ppm sodium hypochlorite and stir for 2-5 minutes;

[0028] (3) Then, add sodium hydroxide to adjust the pH of the wastewater to 9.5-10.5;

[0029] (4) Add 80ppm of PAC polyaluminum chloride and stir for 2-5 minutes;

[0030] (5) Then add 40ppm trisodium thiocyanate and stir for 2-5 minutes;

[0031] ⑹Finally, add 3ppm anion and stir for 10-20 minutes, precipitate for 10-20 minutes, filter, and measure the nickel content in the filtered water.

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PUM

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Abstract

The invention relates to a treatment method for eliminating complex nickel out of wastewater. The treatment method comprises the following steps: (1) firstly, adding sulfuric acid to adjust the pH value of the wastewater to 2.0-3.0; (2) further adding 80-800ppm of sodium hypochlorite and stirring for 2-5 minutes; (3) adding sodium hydroxide to adjust the pH value of the wastewater to 9.5-10.5; (4) adding 50-500ppm of PAC (Poly Aluminum Chloride), and stirring for 2-5 minutes; (6) adding 0.5-5ppm of anion, stirring for 10-20 minutes, depositing for 10-20 minutes, filtering, and measuring the content of nickel in the filtered water. The treatment method has the beneficial effects that a small dosage is needed, good treatment effects on nickel in various forms in water are achieved, no secondary pollution is caused, the water is prevented from darkening, no toxic gas is generated, a good treatment effect on nickel in the complex state is also achieved, and the treatment method is high in cost performance ratio and high in nickel elimination rate.

Description

technical field [0001] The invention relates to wastewater treatment technology, in particular to a treatment method for removing complexed nickel-containing wastewater. Background technique [0002] There are many industrial sources of nickel-containing wastewater, mainly the electroplating industry. In addition, mining, metallurgy, machinery manufacturing, chemistry, instrumentation, petrochemical, textile and other industries, as well as steel plants, iron foundries, automobile and aircraft manufacturing, printing, ink, Wastewater discharged from industries such as ceramics and glass also contains nickel. Heavy metal nickel wastewater is one of the most serious water pollution and one of the most harmful industrial wastewater. The heavy metal nickel in wastewater cannot be decomposed and destroyed by various common water treatment methods, but can only transfer their existing locations and change their physical and chemical states. Therefore, heavy metal nickel wastewat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
Inventor 夏志先
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH