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Treating method for thallium-containing wastewater

A treatment method and wastewater technology, applied in water/sewage treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of secondary pollution removal rate, high treatment cost, complicated operation, etc., and achieve convenient Subsequent processing, simple operation, cheap and easy-to-obtain raw materials

Inactive Publication Date: 2016-11-23
湖南省环境保护科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The above treatment methods have the following defects: at least one of high treatment cost, complicated operation, secondary pollution and low removal rate

Method used

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  • Treating method for thallium-containing wastewater
  • Treating method for thallium-containing wastewater
  • Treating method for thallium-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] For the thallium-containing wastewater discharged from a factory, the pH value of the wastewater is 9.0, and the content of thallium is 18.16 mg / L.

[0037] The method of the present invention is used to treat the above-mentioned thallium-containing waste water, which specifically comprises the following steps:

[0038] The first step, adding an oxidant to the thallium-containing wastewater for oxidation treatment, specifically: adding a sodium hypochlorite solution to the thallium-containing wastewater to stir or aerate for 30 minutes, and the stirring rate is 150 rpm.

[0039] The second step is to carry out precipitation treatment on the oxidized thallium-containing waste water. The precipitation treatment is specifically as follows: first, adding sodium sulfide to the oxidized thallium-containing wastewater for precipitation (stirring for 50 minutes), and massaging the sodium sulfide dosage. The molar ratio S (mol): Tl (mol) is 14:1; then add a flocculant for precip...

Embodiment 2- Embodiment 10

[0043] Example 2-Example 10 differs from Example 1 in Table 1:

[0044] Table 1 The parameter statistics table of embodiment 1-10

[0045]

[0046]

[0047] The discharge liquid obtained in Example 2-Example 10 was detected in the same manner as in Example 1, and the content of thallium obtained is shown in Table 1.

[0048] It can be seen from Table 1 that the amount of oxidant is very important for the treatment of thallium-containing wastewater, and the addition of oxidant can make the Tl in wastewater. + Convert to Tl 3+ , laying the foundation for subsequent precipitation. When the amount of oxidant added is too low (see Example 1-3 for details), T1 + Incomplete conversion will affect the removal effect; when the amount of oxidant added is too high (see Examples 9-10 for details), the unreacted oxidant will react with the subsequent sodium sulfide, affecting the removal effect of Tl. Therefore, the optimal dosage of oxidant Cl(mol):Tl(mol) is 4:1-8:1.

Embodiment 11- Embodiment 15

[0050] Example 11-Example 15 differs from Example 5 in Table 2:

[0051] Table 2 Parameter statistics table of embodiment 5 and embodiment 11-15

[0052]

[0053] The effluent obtained in Example 11-Example 15 was tested in the same manner as in Example 1, and the content of thallium obtained is shown in Table 2.

[0054] As can be seen from Table 2, the time of sodium sulfide precipitation treatment is very obvious to the T1 treatment effect in the waste water, and along with the prolongation of time, the precipitation reaction is more and more thorough, and when the precipitation time reaches more than 40min (Example 5, Example 14 -15), the reaction basically tends to be stable, therefore, the optimal reaction time is preferably 40min-60min.

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Abstract

The invention provides a treating method for thallium-containing wastewater. The treating method comprises the following steps: 1) adding an oxidizing agent into the thallium-containing wastewater for oxidizing; 2) performing sedimentation treatment including sodium sulphide sedimentation and flocculant sedimentation on the thallium-containing wastewater subjected to oxidizing treatment; 3) adopting an adsorbent for absorbing the supernatant liquid obtained in the step 2), thereby finishing the treatment for thallium-containing wastewater, wherein styrene-divinyl benzene copolymer is taken as the adsorbent. The treating method for thallium-containing wastewater, provided by the invention, comprises the processes of oxidizing treatment, sedimentation treatment and adsorption treatment; the sedimentation treatment comprises the two steps of sodium sulphide sedimentation and flocculant sedimentation; an oxidation-sedimentation-adsorption combined technique is combined with a physical chemistry method, so that secondary pollution is not caused; according to the treating method provided by the invention, the treating condition is easy to control and thallium in the wastewater can be extremely removed; the raw materials required by the treating method provided by the invention are easily acquired and low in cost; the operation is simple; the running cost is greatly lowered.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating thallium-containing wastewater. Background technique [0002] Thallium (Tl) is a typical highly toxic heavy metal element. It also contains a very small amount of thallium element in human kidneys and urine. Due to the high toxicity of thallium, it is one of the important physiological and highly toxic elements and has accumulative properties. When a person ingests an excessive amount of thallium, it will be poisoned, causing a series of complications such as hair loss. The content of thallium in the natural environment medium is very low, and it is often associated with some minerals. It enters the environment with the mining and deep processing of minerals, causing serious pollution to the environment. The thallium content in wastewater discharged from thallium crystal production, sulfuric acid manufacturing, heavy metal beneficiation, smelti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/54C02F101/20
CPCC02F9/00C02F1/285C02F1/5236C02F1/54C02F1/66C02F1/72C02F1/74C02F1/76C02F2101/20
Inventor 许友泽文涛成应向陈才丽向仁军付广义赵媛媛
Owner 湖南省环境保护科学研究院
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