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Method for treating arsenic in water with high-specific-surface-area Schwertmannite adsorbent

A technology with high specific surface area and Shi's minerals, applied in the direction of adsorption water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve difficult large-scale industrial applications, difficult treatment, slow reaction kinetics process of oxidation method And other issues

Inactive Publication Date: 2013-03-20
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the precipitation method and the biochemical method need to add a large amount of precipitant or activated sludge, and the final product is still difficult to handle, resulting in a large amount of arsenic-containing waste residue, which is easy to cause secondary pollution due to long-term accumulation; the oxidation method is slow in reaction kinetics and requires high investment. , thus limiting its practical application; the cost of ion exchange method is too high, it is difficult to carry out large-scale industrial application
Traditional arsenic adsorbents are mainly solid materials that are insoluble in water, such as activated carbon and silicon aluminum oxide. Arsenic-containing solid waste causes secondary pollution, and the strong adsorption between the adsorbent and arsenic makes it difficult to recover, regenerate, and reuse the adsorbent

Method used

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  • Method for treating arsenic in water with high-specific-surface-area Schwertmannite adsorbent
  • Method for treating arsenic in water with high-specific-surface-area Schwertmannite adsorbent
  • Method for treating arsenic in water with high-specific-surface-area Schwertmannite adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Weigh 30 mg of dry solid adsorbent into several Erlenmeyer flasks.

[0028] 2) Prepare the As(V) concentration of 20-550mg L respectively -1 0.1mol L -1 NaCl solution 30mL, containing As(III) concentration of 10-100mg L -1 0.1mol L -1 NaCl solution 30mL. Add each solution to the Erlenmeyer flask containing the adsorbent.

[0029] 3) Use 6mol L -1 HCl and 6mol L -1 NaOH solution accurately adjusts the pH of the suspension to 3.0 or 7.0.

[0030] 4) Shake the suspension in a water bath shaker, the temperature of the water bath is 25°C, and the shaker rotates at 140 rpm.

[0031] 5) After 3 hours, the suspension was separated by centrifugation, the speed of the centrifuge was 12000 rpm, and the concentration of arsenic in the solution was measured.

[0032] The implementation results show that: under the condition of pH 3.0, the adsorption capacity of the adsorbent to As(V) is 182.86 mg g -1 , the adsorption capacity for As(III) is 45.50 mg g -1 ; Under the c...

Embodiment 2

[0035] 1) Weigh 30 mg of dry solid adsorbent into several Erlenmeyer flasks.

[0036] 2) Prepare As(V) and As(III) concentrations of 100mg L respectively -1 0.1mol L -1 NaCl solution 30mL. Each solution was added to each Erlenmeyer flask which had been weighed with the adsorbent.

[0037] 3) Use 6mol L -1 HCl and 6mol L -1 NaOH solution adjusted the pH of each suspension containing As(V) and As(III) to 2.0, 3.0, 5.0, 7.0, 9.0 and 11.0, respectively.

[0038] 4) Shake the suspension in a water bath shaker, the temperature of the water bath is 25°C, and the shaker rotates at 140 rpm.

[0039] 5) After 3 hours, the suspension was separated by centrifugation, the speed of the centrifuge was 12000 rpm, and the concentration of arsenic in the solution was measured.

[0040] The results show that the low pH condition is favorable for the adsorption of As(V), and the high pH condition is favorable for the adsorption of As(III). For the adsorption of As(V), the adsorption amou...

Embodiment 3

[0042] 1) Weigh 30 mg of dry adsorbent solids into several Erlenmeyer flasks.

[0043] 2) Prepare As(V) and As(III) concentrations of 100mg L respectively -1 0.1mol L -1 NaCl solution 30mL. Each solution was added to each Erlenmeyer flask which had been weighed with the adsorbent.

[0044] 3) Use 6mol L -1 HCl and 6mol L -1 NaOH solution accurately adjusts the pH of the suspension to 3.0 or 7.0.

[0045] 4) Shake the suspension in a water bath shaker, the temperature of the water bath is 25°C, and the shaker rotates at 140 rpm.

[0046] 5) After 3 hours, the suspension was separated by centrifugation, the speed of the centrifuge was 12000 rpm, and the concentration of arsenic in the solution was measured.

[0047] 6) The separated solid is added again to the arsenic solution prepared according to step 2), and steps 3) to 5) are repeated.

[0048] The implementation results show that: under the condition of pH 3.0, the adsorption rate of As(V) by this adsorbent can be...

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Abstract

The invention discloses a method for treating arsenic in water by using high-specific-surface-area Schwertmannite as adsorbent, belonging to a waste water treatment technology. The method comprises the following procedures: adding artificially synthesized Schwertmannite having a high specific surface area into arsenic-containing waste water; and according to the specific ratio of As(V) to As(III) in the waste liquid, regulating the pH value of the waste liquid to a proper valve with acid and alkali, thus recovering As(V) and As(III) in the industrial waste water, wherein the As(V) adsorption capacity can be up to 182.86 mg.g<-1>(pH 3.0), and the As(III) adsorption capacity can be up to 217.85 mg.g<-1>(pH 7.0); and the adsorbent can be repeatedly used 7 times. According to the invention, the provided natural mineral adsorbent is low in cost, high in adsorption capacity and friendly to environment and can adsorb As(V) and As(III); and the adsorbent can be dissolved in strong acid, thereby avoiding the secondary pollution of solid waste.

Description

technical field [0001] The invention relates to a method for treating waste water containing pentavalent arsenic [As(V)] and trivalent arsenic [As(III)], in particular to a method for treating As in water by using Shi's mineral with a high specific surface area as an adsorbent (V) and As(III) methods. Background technique [0002] Arsenic and its compounds are highly toxic and carcinogenic. If arsenic in industrial wastewater flows into the natural environment without treatment, it can cause serious damage to human health, leading to acute and chronic poisoning and even cancer. Arsenic-containing industrial wastewater comes from a wide range of sources. Wastewater discharged from mining, metallurgy, chemical industry, power generation, papermaking and other industries all contain a large amount of arsenic. Every year, tens of thousands of tons of arsenic are discharged due to the smelting of copper, zinc and lead. Therefore, the treatment of arsenic-containing industrial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/64B01J20/06B01J20/30
Inventor 韩煦王为民王健
Owner TIANJIN POLYTECHNIC UNIV
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