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Treatment method of low-concentration cadmium-containing wastewater

A treatment method and low-concentration technology, applied in water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, chemical instruments and methods, etc., to achieve high cadmium removal rate, simple operation and low cost

Inactive Publication Date: 2014-01-01
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 low-cost, less dosage, and at the same time has a good treatment effect on various forms of cadmium in water, simple operation, no secondary pollution, no odorous gas generation, cadmium removal A treatment method for low-concentration cadmium-containing wastewater with a rate of up to 99.5%, in order to solve many shortcomings of existing wastewater treatment technologies

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0014] The treatment method of the low-concentration cadmium-containing wastewater described in the embodiments of the present invention mainly consists of the following steps:

[0015] (1) Add 100ppm of PAC and stir for 2-5 minutes;

[0016] (2) Then add 30ppm trisodium thiocyanate and stir for 2-5 minutes;

[0017] (3) Then, add 3 ppm 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

[0019] It mainly consists of the following steps:

[0020] (1) Add 100ppm of PAC and stir for 2-5 minutes;

[0021] (2) Then add 60ppm trisodium thiocyanate and stir for 2-5 minutes;

[0022] (3) Then, add 3 ppm 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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PUM

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Abstract

The invention relates to a treatment method of low-concentration cadmium-containing wastewater, which comprises the following steps: adding 50-500ppm of PAC (polyaluminum chloride), and stirring for 2-5 minutes; adding 10-100ppm of trisodium trithiocyanurate, and stirring for 2-5 minutes; and adding 0.5-5ppm of anion, stirring for 10-20 minutes, precipitating for 10-20 minutes, filtering, and measuring the cadmium content in the filtered water. The method has the advantages of low cost, low consumption, no secondary pollution, no smelly gas generation and high cadmium removal rate (up to 99.5%), has favorable treatment effect for various forms of cadmium in the water body, and is simple to operate.

Description

technical field [0001] The invention relates to waste water treatment technology, in particular to a treatment method for low-concentration cadmium-containing waste water. Background technique [0002] Cadmium is a highly toxic heavy metal, and most of its compounds are toxic substances, so it is considered a dangerous environmental pollutant. A very small amount of cadmium can cause harm to the human body. It is enriched through the food chain, has the characteristics of stability, accumulation and is not easy to eliminate, and can cause chronic poisoning to the human body. It mainly accumulates in the liver, kidney, pancreas, thyroid and bones. Pathological changes in organs such as the kidneys can cause diseases such as neuralgia and endocrine disorders, and even cause people to die of pain. Studies in recent years have proved that cadmium will be the third metal element that pollutes the human environment and threatens human health after mercury and lead, both in terms ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F101/22
Inventor 夏志先
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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