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Method for removing thallium in wastewater

A waste water and ceramic material technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as inconvenient waste water recycling, difficulty in reaching standards, and increasing waste water salinity, and achieves suitable for large-scale applications, The process is simple and controllable, and the effect of reducing the amount of use

Active Publication Date: 2016-05-04
HUNAN SAMMNS ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the chemical method needs to add a large amount of chemical agents, the cost of sewage treatment is high, and it is difficult to treat the thallium-containing sewage up to the standard; the physical and chemical method (mainly ion exchange method, adsorption method and membrane separation technology method) is suitable for the treatment of low-concentration heavy metal ion sewage , but the industrialization is more difficult and the treatment efficiency is low; the biochemical method has high requirements for environmental adaptation (only continuous, not intermittent), the metal ion removal rate is low, and it is difficult to meet the standard
The traditional chemical agent method is only suitable for the treatment of high-concentration ion sewage, and the treatment of heavy metal ions is not thorough
[0006] The traditional treatment of thallium-containing wastewater needs to add a large amount of oxidants, lime and alkali, etc. This method requires a large amount of chemicals, high cost, and unstable effluent
When the water quality of the influent changes, it is difficult to discharge it stably after treatment, and it is not suitable for the advanced treatment of low-concentration heavy metal ion polluted wastewater, and the thallium-containing sludge formed by sedimentation is a hazardous waste, which is likely to cause secondary pollution
[0007] Salt precipitation method: Saturated NaCl solution can promote the effective precipitation of Tl(I) in the wastewater in the form of T1C1, but this method will increase the salinity of the wastewater, which is inconvenient for wastewater recycling, and at the same time, the consumption of NaCl is astonishing;
[0008] Membrane method: Membrane methods mainly include ultrafiltration, reverse osmosis and electrodialysis. These methods can only play the role of separation and concentration, and it is difficult to completely remove thallium-containing pollutants from water
[0009] Biological method: using thallium-tolerant strains to flocculate thallium mine wastewater, the removal rate can reach up to 70.8%, but the tolerance and impact load resistance of microorganisms in biological methods still limit its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Ozone oxidation is introduced into the thallium-containing wastewater with a thallium content of 4.5mg / L, and the oxidation-reduction potential is controlled at 400-450mV during oxidation.

[0032] 2. Add mixed flocculant, in the mixed flocculant, the mass ratio of sodium hydroxide, sodium sulfide, polyferric sulfate, and sodium polystyrene sulfonate is: 3.2:1.8:4.5:0.5; during the flocculation process, the pH is controlled at 9- 10.

[0033] Sodium hydroxide, sodium sulfide, polyferric sulfate, and sodium polystyrene sulfonate are mixed and slowly dissolved in water at 55°C before use.

[0034] Add 20mL of mixed flocculant to every 500mL of waste water.

[0035] 3. Solid-liquid separation, adding a pore size of 10-22nm to the liquid part, using a carboxyl-modified ceramic material for adsorption, and keeping it in contact with wastewater for 10 minutes.

[0036] 4. Use deionized water to clean the ceramic material adsorbing thallium, and the contact time with deio...

Embodiment 2

[0039] 1. When the thallium-containing wastewater with a thallium content of 15.3mg / L is passed through ozone for oxidation, the oxidation-reduction potential is controlled to be 415mV during oxidation.

[0040] 2. Add the mixed flocculant, in the mixed flocculant, the mass ratio of sodium hydroxide, sodium sulfide, polyferric sulfate, and sodium polystyrene sulfonate in the mixed flocculant is: 3.1:1.9:4.3:0.7; during the flocculation process Control the pH to 9.5.

[0041] Add 24mL of mixed flocculant to every 500mL of waste water.

[0042] 3. Solid-liquid separation, adding pore size of 15-35nm to the liquid part, using hydroxyl-modified ceramic material for adsorption, and keeping it in contact with wastewater for 10.5 minutes.

[0043] 4. Use deionized water to clean the ceramic material adsorbing thallium, and the contact time with deionized water is 6.3 minutes.

[0044] In the wastewater after adsorption, the content of thallium is 0.00025mg / L.

Embodiment 3

[0046] 1. Ozone oxidation is introduced into the thallium-containing wastewater with a thallium content of 50.66mg / L, and the oxidation-reduction potential is controlled to be 435mV during oxidation.

[0047] 2. Add mixed flocculant, in the mixed flocculant, the mass ratio of sodium hydroxide, sodium sulfide, polyferric sulfate, and sodium polystyrene sulfonate is: 3.3:1.7:4.2:0.8; control the pH to 10 during the flocculation process.

[0048] Sodium hydroxide, sodium sulfide, polyferric sulfate, and sodium polystyrene sulfonate are mixed and slowly dissolved in water at 55°C before use.

[0049] Add 30mL of mixed flocculant to every 500mL of waste water.

[0050] 3. Solid-liquid separation, adding a pore size of 12-20nm to the liquid part, using a siloxane-based modified ceramic material for adsorption, and keeping it in contact with the wastewater for 14 minutes.

[0051] 4. Use deionized water to clean the ceramic material adsorbing thallium, and the contact time with deio...

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Abstract

The invention discloses a method for removing thallium in wastewater. According to the method, ozone is delivered in to thallium-containing wastewater for oxidizing; a mixed flocculating agent is added into the wastewater, wherein the mixed flocculating agent comprises sodium hydroxide, sodium sulfide, polymeric ferric sulfate and sodium polystyrenesulfonate; after flocculation, solid-liquid separation is completed; and a ceramic material is added into a liquid part for adsorption. With the method provided by the invention, chemical agent dose can be reduced; no secondary pollution is caused; and the efficiency is high. The method is suitable for large-scale applications, and the process is simple and controllable. Outlet water quality (thallium content) is stabilized at below 0.005mg / L. The adsorption material can be recycled. The method can be used for carrying out deep treatment upon low-concentration heavy-metal-ion-polluted wastewater.

Description

technical field [0001] The invention belongs to the field of heavy metal ion wastewater treatment, and in particular relates to a method for removing thallium in wastewater. Background technique [0002] Thallium is a highly toxic element with accumulative properties and is a strong neurotoxicant. The concentration of thallium in water bodies is very low, and thallium-containing ores and smelting waste residues are the main sources of thallium in water. Thallium can enter the human body through the food chain, skin contact, and floating dust. [0003] Thallium and its compounds are widely used as industrial raw materials, such as oxidants in organic synthesis, ceramic semiconductor materials, jewelry imitations, low temperature thermometers, corrosion-resistant containers, infrared spectrophotometers, alloys, electronic equipment, special glass, etc. Thallium is becoming an essential material for high-tech industries. [0004] In the application number 201410582051.X, "a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/281C02F1/52C02F1/5236C02F1/5245C02F1/56C02F1/78C02F9/00C02F2101/20C02F2209/04C02F2209/06C02F2209/44C02F2303/16
Inventor 奉向东王健周磊程坤赵铁熊果曾力
Owner HUNAN SAMMNS ENVIRONMENTAL PROTECTION CO LTD
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