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Treatment method of high concentration waste water containing cadmium

A treatment method and high-concentration technology, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to achieve good removal effect, low price, and high cost performance.

Inactive Publication Date: 2013-12-25
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects, the present invention provides a treatment method for high-concentration cadmium-containing wastewater with low cost, low dosage, no secondary pollution, high cost performance, and a good removal effect on various forms of cadmium in water bodies. Solve many shortcomings of existing wastewater treatment technology

Method used

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Effect test

Embodiment 1

[0015] The treatment method of the high-concentration cadmium-containing wastewater described in the embodiments of the present invention mainly consists of the following steps:

[0016] (1) First add sodium hydroxide to adjust the pH of the wastewater to 7.5-8.5;

[0017] (2) Then add 200ppm of PAC and stir for 2-5 minutes;

[0018] (3) Then, add 40ppm trisodium thiocyanate and stir for 2-5 minutes;

[0019] (4) Finally, add 4ppm of anion and stir for 10-20 minutes, precipitate for 10-20 minutes, filter, and measure the cadmium content in the filtered water.

Embodiment 2

[0021] It mainly consists of the following steps:

[0022] (1) First add sodium hydroxide to adjust the pH of the wastewater to 7.5-8.5;

[0023] (2) Then add 200ppm of PAC and stir for 2-5 minutes;

[0024] (3) Then, add 80ppm trisodium thiocyanate and stir for 2-5 minutes;

[0025] (4) Finally, add 4ppm of anion and stir for 10-20 minutes, precipitate for 10-20 minutes, filter, and measure the cadmium content in the filtered water.

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Abstract

The invention relates to a treatment method of high concentration waste water containing cadmium, which comprises the following steps: at first, adding sodium hydroxide, and adjusting the pH of the waste water to be 7.5 to 8.5; then adding 50 to 500 ppm PAC, and stirring for 2 to 5 minutes; then adding 10 to 100 ppm trithiocyanuric acid trisodium salt, and stirring for 2 to 5 minutes; finally adding 0.5 to 5 ppm anions, stirring for 10 to 20 minutes, precipitating for 10 to 20 minutes, filtering, and measuring the cadmium content in the filtered water. The treatment method has the benefits that only sodium hydroxide, PAC, trithiocyanuric acid trisodium and the anions are needed to be added mainly, the cadmium content in the water body can be reduced by 99.5%, the cost is low, the dose is small, the secondary pollution can be avoided, the cost performance is high, and meanwhile the removal effect on cadmium in various modalities in the water body is very good.

Description

technical field [0001] The invention relates to waste water treatment technology, in particular to a treatment method for high-concentration cadmium-containing waste water. Background technique [0002] Cadmium-containing wastewater is one of the most harmful heavy metal wastewater. Although metal cadmium has no pathological significance, cadmium compounds are very toxic; cadmium-containing wastewater is highly toxic, and cadmium is easy to accumulate in organisms. If it is discharged directly without treatment, it will easily cause chronic poisoning of humans and animals, and bring great harm to the environment. Great harm. Fish will be poisoned if they live in water with a cadmium concentration of 0.01-0.02 mg / L, and will die when the concentration is 0.2-1.1 mg / L; the toxicity of cadmium can seriously inhibit the growth of microorganisms, and when the concentration is 0.1-1.0 mg / L , The microbial mortality rate can reach about 50%. Cadmium in irrigation water not only ...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F101/20
Inventor 夏志先
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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