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A method for removing metal thallium in waste water

A waste water and metal technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of complex treatment process, difficult waste residue treatment, large consumption of chemicals, etc., and achieve simple process conditions and low cost , cheap effect

Active Publication Date: 2021-09-21
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies have the disadvantages of adjusting the pH value, flocculation and adsorption process need to add a large amount of alkali, flocculant and adsorbent, the consumption of chemicals is large, the treatment cost is high, the treatment process is complicated, and the operation is inconvenient. A large amount of waste is difficult to handle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1. Under the condition of sufficient stirring, add nano-manganese dioxide to the thallium-containing wastewater with a thallium content of 1mg / L, and then add sodium percarbonate solid powder to perform adsorption, oxidation and precipitation at the same time; static sedimentation for 20 minutes . The dosage of described sodium percarbonate is 0.33mg / L; Described nano manganese dioxide is δ-MnO 2 , the dosage is 0.22mg / L; the molar ratio of sodium percarbonate to thallium is 0.5:1, and the molar ratio of nano manganese dioxide to sodium percarbonate is 1:1;

[0025] Step 2, solid-liquid separation, the thallium in the solid phase is separated from the water body, and the thallium is removed from the wastewater

[0026] After treatment, the content of thallium in the effluent water was determined to be 0.0018 mg / L by an inductively coupled plasma mass spectrometer.

Embodiment 2

[0028] Step 1. Under the condition of sufficient stirring, add nano-manganese dioxide to the thallium-containing wastewater with a thallium content of 1mg / L, and then add sodium percarbonate solid powder to perform adsorption, oxidation and precipitation at the same time; static sedimentation for 20 minutes . The dosage of described sodium percarbonate is 6.51mg / L; Described nano manganese dioxide is δ-MnO 2 , the dosage is 4.26mg / L; the molar ratio of sodium percarbonate to thallium is 10:1, and the molar ratio of nano manganese dioxide to sodium percarbonate is 1:1;

[0029] Step 2, solid-liquid separation, the thallium in the solid phase is separated from the water body, and the thallium is removed from the wastewater

[0030] After treatment, the content of thallium in the effluent water was determined to be 0.0014 mg / L by an inductively coupled plasma mass spectrometer.

Embodiment 3

[0032] Step 1. Under the condition of sufficient stirring, add nano-manganese dioxide to the thallium-containing wastewater with a thallium content of 1mg / L, and then add sodium percarbonate solid powder to perform adsorption, oxidation and precipitation at the same time; static sedimentation for 20 minutes . The dosage of described sodium percarbonate is 32.54mg / L; Described nano manganese dioxide is δ-MnO 2 , the dosage is 21.28mg / L; the molar ratio of sodium percarbonate to thallium is 50:1, and the molar ratio of nano manganese dioxide to sodium percarbonate is 1:1

[0033] Step 2, solid-liquid separation, the thallium in the solid phase is separated from the water body, and the thallium is removed from the wastewater

[0034] After treatment, the content of thallium in the effluent water was determined to be 0.0013 mg / L by an inductively coupled plasma mass spectrometer.

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PUM

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Abstract

The invention discloses a method for removing metal thallium in waste water, which comprises the following steps: step 1, under the condition of sufficient stirring, firstly add catalyst nano-manganese dioxide to the waste water polluted by thallium, and then add solid sodium percarbonate Powder, adsorption, oxidation and precipitation processes simultaneously; static sedimentation for at least 10 minutes; step 2, solid-liquid separation: separate thallium in the solid phase from the water body, and remove thallium in the wastewater. The invention has the advantages of simple process conditions, low operation requirements, low cost, and a large reduction of remaining waste residues; the used pharmaceutical materials are green and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for removing metal thallium in waste water. Background technique [0002] Thallium is a highly dispersed rare metal element widely used in industries such as chemical industry, electronics, medicine, aerospace, high-energy physics, and superconducting materials. At the same time, thallium is also an element with strong physiological toxicity. Due to the continuous development and utilization of thallium-containing resources, the ways for thallium to enter the water environment are expanding. Therefore, thallium has become one of the highly toxic heavy metal elements that has attracted more attention in the field of water treatment research. Thallium has two valence states, Tl(Ⅰ) and Tl(Ⅲ), which mainly exist in the positive monovalent form in nature. Its toxicity is greater than that of arsenic. It can enter the human body through the digestive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F1/52C02F101/20
CPCC02F1/5245C02F1/722C02F1/725C02F2101/20
Inventor 皇甫小留刘巨超王海楠何强邹依洁孙莉莉
Owner CHONGQING UNIV