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Method for treating antimony-containing waste water by modified bentonite

A technology of bentonite and waste water, which is applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc. It can solve the problems of high cost of industrial waste water treatment, high cost and increased cost of industrial production, and achieve fast adsorption speed , broad application prospects, low cost effect

Inactive Publication Date: 2012-07-18
SHANXI DATONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For heavy metal ions such as arsenic, copper, and lead in wastewater, the more common removal methods currently used are the use of iron-aluminum flocculants, activated carbon adsorption, etc., and the disadvantage of these methods is that the cost of wastewater treatment is relatively high. High, so using these methods, while obtaining qualified effluent quality, the cost of industrial wastewater treatment is also very high, which often increases the cost of industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add the above-mentioned bentonite adsorbent to the antimony-containing wastewater in a proportion of 2.5% by weight, adjust the pH value to 6, and the reaction temperature is 5°C, 25°C, and 50°C in sequence, and stir for 3 hours at a speed of 250r / min , standing for 200 minutes, precipitation, solid-liquid separation, measurement of the concentration of antimony in the waste water after treatment, under different reaction conditions, the removal rate obtained is shown in Table 1 below, with an average of more than 95%.

[0016] Table 1, Under the reaction condition of 5°C, the removal rate of antimony-containing wastewater treated with modified bentonite

[0017] The initial concentration 5mg / L 10mg / L 15mg / L 20mg / L 30mg / L 40mg / L Concentration after treatment 0.2mg / L 0.5mg / L 0.75mg / L 0.6mg / L 1.5mg / L 1.6mg / L Removal rate 96% 95% 95% 97% 95% 96%

Embodiment 2

[0019] Add the above-mentioned bentonite adsorbent to the antimony-containing wastewater in a proportion of 2.5% by weight, adjust the pH value to 6, and the reaction temperature is 5°C, 25°C, and 50°C in sequence, and stir at a speed of 300r / min for 3 hours , Stand still for 120-210 minutes, settling, after solid-liquid separation, measure the concentration of antimony in the waste water after treatment, under different reaction conditions, the removal rate that obtains is shown in the following table 2.

[0020]

[0021] Table 2. Under the reaction conditions of 25 °C, the removal rate of antimony-containing wastewater treated with modified bentonite

[0022] The initial concentration 5mg / L 10mg / L 15mg / L 20mg / L 30mg / L 40mg / L Concentration after treatment 0.45mg / L 0.9mg / L 1.35mg / L 2mg / L 3mg / L 4mg / L Removal rate 91% 91% 91% 90% 90% 90%

Embodiment 3

[0024] Add the above-mentioned bentonite adsorbent to the antimony-containing wastewater in a proportion of 2.5% by weight, adjust the pH value to 6, and the reaction temperature is 5°C, 25°C, and 50°C in sequence, and stir at a speed of 200r / min for 3 hours , Stand still for 120-210 minutes, settling, after solid-liquid separation, measure the concentration of antimony in the waste water after treatment, under different reaction conditions, the removal rate that obtains is shown in the following table 3.

[0025] Table 3, under the reaction condition of 50℃, the removal rate of antimony-containing wastewater treated with modified bentonite

[0026] The initial concentration 5mg / L 10mg / L 15mg / L 20mg / L 30mg / L 40mg / L Concentration after treatment 0.55mg / L 1.1mg / L 1.65 mg / L 2.2 mg / L 3.9mg / L 5.2mg / L Removal rate 89% 89% 89% 89% 87% 87%

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Abstract

The invention relates to the field of waste water treatment, and especially relates to a method for treating antimony-containing waste water by modified bentonite. The method provided by the invention solves the problems of treatment on high-concentration antimony-containing waste water. The method provided by the invention comprises the following steps of drying and crushing bentonite, carrying out fine grinding, carrying out boiling by a H2SO4 solution, washing, drying by an oven, grinding to obtain an adsorbent, adding the adsorbent into a reaction tank of antimony-containing waste water according to a weight ratio of 2.5%, mixing, adjusting a pH value of the mixture to a pH value of 5.5 to 6.5, stirring at a treatment temperature of 4 to 7 DEG C at a rate of 200 to 300r / min for 3 hours, and standing for 120 to 210 minutes for precipitation so that solid-liquid separation is realized and product water having low antimony content is obtained. The method provided by the invention has the advantages of high efficiency, low energy consumption, simple and easy processes, fast adsorption speed, large and full adsorption capacity, high clearance of antimony in waste water, low cost, good effects and wide application prospects, wherein through the method, the clearance of antimony in waste water can reach above 95%.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for treating antimony-containing wastewater with modified bentonite. Background technique [0002] In recent years, with the development of my country's economy and the continuous improvement of industrialization, antimony pollution in the environment is becoming increasingly prominent, especially around smelters and mining areas, where antimony pollution is particularly prominent. On the other hand, antimony is similar to arsenic in terms of toxicity and toxicity, so antimony pollution in the environment is posing a great threat to human health. In the past ten years, antimony pollution in the environment has gradually attracted the common attention of all countries. The newly revised "Drinking Water Hygienic Standards" (GB5749-2006), which was implemented on July 1, 2007, added antimony in drinking water. The highest content standard is 5 μg / L. Therefore, as the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62B01J20/12
Inventor 席建红袁勇张桂枝许琳
Owner SHANXI DATONG UNIV
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