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Method for removing thallium from wastewater

A waste water and solution technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of low adsorption capacity, insufficient thallium removal depth, and inability to use thallium-containing waste water treatment process, etc.

Active Publication Date: 2016-11-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is only suitable for the removal of thallium in a specific solution and cannot be used for the treatment of thallium-containing wastewater
Adsorption method is a water treatment technology that uses porous solid phase substances to adsorb and separate thallium pollutants in water. The core part of this technology is the adsorbent. Currently, the widely used adsorbents for removing thallium mainly include activated carbon, nano-metal oxides, Biomaterials and composite materials, etc., but this method often has problems such as insufficient thallium removal depth, low adsorption capacity, and low efficiency, and cannot achieve a good thallium removal effect
The U.S. Environmental Protection Agency (EPA) recommends the active aluminum method and ion exchange method to treat drinking water with a low content (<10 μg / L), but the thallium content after treatment with this method can only be reduced to 2 μg / L liter, it cannot meet the domestic drinking standard (the maximum allowable value of thallium content is 0.1 micrograms per liter), and the cost of this method is relatively high, so it is difficult to popularize and apply it in the treatment process of a large amount of thallium-containing wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The pickling wastewater from a sulfuric acid plant contains 45 micrograms per liter of thallium, and its treatment process is as follows:.

[0016] (1) Add 20ml / L of 10% sodium sulfite solution to the wastewater, adjust the pH value to 6.5, and stir thoroughly for half an hour.

[0017] (2) Potassium ferrocyanide solution and excess ferric chloride solution are fully mixed to obtain a mixture of Prussian blue, ferric chloride and water, and then this mixture is added to the above waste water to control potassium ferrocyanide The amount added to the waste water is 0.3 mg / L, and it is fully stirred for 15 minutes.

[0018] (3) Add 3ml / L of 10% ferric chloride solution and stir for 15 minutes.

[0019] (4) Solid-liquid separation to remove thallium from wastewater.

[0020] The waste water is treated according to the above-mentioned steps of thallium removal, and the removal rate of thallium reaches 98%.

Embodiment 2

[0022] The thallium content of wastewater from a zinc smelter is 1056 micrograms per liter, and the treatment process is as follows:

[0023] (1) Add 30ml / L of 10% sodium sulfite solution to the wastewater, adjust the pH value to 6.8, and stir thoroughly for half an hour.

[0024] (2) Potassium ferrocyanide solution and excess ferric chloride solution are fully mixed to obtain a mixture of Prussian blue, ferric chloride and water, and then this mixture is added to the above waste water to control potassium ferrocyanide The amount added to the waste water is 6 mg / L, and it is fully stirred for 15 minutes.

[0025] (3) Add 10ml / L of 10% ferric sulfate solution and stir for 15 minutes.

[0026] (4) Solid-liquid separation to remove thallium from wastewater.

[0027] According to the above-mentioned thallium removal steps to treat the wastewater, the removal rate of thallium reaches 99.5%.

Embodiment 3

[0029] The thallium content of desulfurization wastewater from a steelmaking plant is 6,700 micrograms per liter, and the treatment process is as follows:

[0030] (1) Add 50ml / L of 10% sodium sulfite solution to the wastewater, adjust the pH value to 7.2, and stir thoroughly for half an hour.

[0031] (2) Potassium ferrocyanide solution and excess ferric chloride solution are fully mixed to obtain a mixture of Prussian blue, ferric chloride and water, and then this mixture is added to the above waste water to control potassium ferrocyanide The addition amount in the waste water is 38 mg / liter, fully stirred for half an hour.

[0032] (3) Add 30ml / L of 10% polyferric sulfate solution and stir thoroughly for half an hour.

[0033] (4) Solid-liquid separation to remove thallium from wastewater.

[0034] According to the above-mentioned thallium removal steps to treat the wastewater, the removal rate of thallium reaches 99.9%.

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Abstract

The invention relates to a method for removing thallium from wastewater, which can be used for removing thallium from thallium-containing wastewater, and belongs to the technical field of environmental protection. The method comprises the following steps: adding a reducing agent into the wastewater to reduce trivalent thallium in the wastewater into univalent thallium under a sufficient stirring condition, sufficiently mixing a potassium ferrocyanide solution and an excessive amount of ferric trichloride solution to obtain a mixture of Prussian blue, ferric trichloride and water, adding the mixture into the wastewater, adding a ferric coagulant solution, and performing stirring and solid-liquid separation to separate thallium in a solid phase from a water body, namely remove the thallium from the wastewater. The method has the characteristics of low thallium removal cost, simple thallium removal process, no secondary pollution and the like, and is also very suitable for thallium removal treatment of thallium-containing wastewater with relatively high COD.

Description

technical field [0001] The invention relates to a method for removing thallium in wastewater, which can be used for removing thallium in wastewater containing thallium, and belongs to the technical field of environmental protection. Background technique [0002] Thallium is a highly toxic heavy metal element, which is far more toxic to mammals than conventional heavy metals such as mercury, arsenic, cadmium, lead, and antimony. Thallium can seriously damage the human nervous system, accumulate in the bone marrow, kidneys and other organs, cause hair loss, gastrointestinal reactions and muscle atrophy, cause permanent damage to the human central nervous system, heart, liver and kidney, and also cause Teratogenicity and mutagenicity. Thallium is also accumulative. It distributes very quickly in the living body and eliminates very slowly. A very small amount of thallium can cause disability and death when it enters the human body, so it is called "the poison of poisons". In v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F101/20
CPCC02F1/5245C02F1/72C02F9/00C02F2101/20C02F2305/00
Inventor 谢逢春孙仲娟
Owner SOUTH CHINA UNIV OF TECH
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