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Sludge based activated carbon and production method thereof, and application of sludge based activated carbon in electroplating of chromate-containing waste water

A technology of activated carbon production and sludge activated carbon, which is applied in water/sludge/sewage treatment, sludge treatment, water/sewage treatment and other directions, can solve the problems of high price and high treatment cost, achieve low cost, enlarged surface area, adsorption good performance

Inactive Publication Date: 2014-07-09
HUNAN CITY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Activated carbon is an adsorbent that can effectively treat chromium-containing wastewater. Generally, non-renewable or expensive resources such as coal and wood are used to prepare activated carbon, which is expensive and has high treatment costs.

Method used

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Examples

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Effect test

Embodiment 1

[0018] A sludge-based activated carbon, which is prepared by drying, activating, microwave-treating, washing, and drying the sludge; the volatile content of the sludge-based activated carbon is 13% to 29%, the ash content is 32% to 50.1%, and the fixed carbon is 28.79% ﹪~43.56﹪, specific surface area 260m 2 / g~450m 2 / g, the average pore diameter is 3.179 nm.

[0019] A kind of sludge-based activated carbon production method, it comprises the following steps:

[0020] (1) Dry the sludge at a constant temperature of 105 °C for 12 hours to 24 hours (20 hours in this example), dry to a moisture content below 10%, grind and sieve to obtain sludge particles with a particle size of 1.0 mm to 3.0 mm;

[0021] In step (1) of the present invention, the volatile content of the sludge is 43.5% to 60.1%, the ash content is 32.3% to 48.7%, and the fixed carbon is 7% to 10%.

[0022] The volatile content of the sludge in this example is 56.98%, the ash content is 34.27%, and the fixed ca...

Embodiment 2

[0032] In step (1) of the present invention, the volatile content of the sludge in this embodiment is 52.18%, the ash content is 43.27%, and the fixed carbon is 9.25%.

[0033] In step (4) of the present invention, the volatile content of the sludge activated carbon in this embodiment is 25%, the ash content is 38.19%, the fixed carbon is 33.59%, and the specific surface area is 314m 2 / g, the volumes of large pores with pore diameter ≥ 50nm, medium pores with pore diameter -3 cm 3 / g, 110.55×10 -3 cm 3 / g, 55.64×10 -3 cm 3 / g, the average pore diameter is 3.134 nm, and the iodine value is 348mg / g.

[0034] In the treatment of electroplating chromium-containing wastewater, sludge activated carbon is used as an adsorbent, take 40mL of hexavalent chromium solution with an initial concentration of 32.92mg / L, adjust the pH to 4.0, add 0.15g of sludge activated carbon, react for 120min, and take the supernatant , the concentration of residual hexavalent chromium in the solu...

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Abstract

The invention discloses sludge based activated carbon and a production method thereof, and application of the sludge based activated carbon in electroplating of chromate-containing waste water. The sludge based activated carbon is characterized by being prepared by the following steps: drying and activating sludge, performing microwave treatment, washing, and baking, wherein the sludge activated carbon comprises 13-29% of volatile component, 32-50.1% of ash content and 28.79-43.56% of fixed carbon, the specific surface area is 260-450m<2> / g, and the mean pore size is 3.179nm. The sludge activated carbon is used as an adsorbent in electroplating treatment of the chromate-containing waste water; the production method is simple, the superficial area of the sludge based activated carbon produced by micro-wave heating and steam activating methods is significantly enlarged, the sludge based activated carbon is good in adsorptive property, is low in cost, changes waste into treasures, the problem of sludge disposal is solved, and reclamation of the sludge is achieved.

Description

technical field [0001] The invention relates to an activated carbon and its production method and the treatment of electroplating chromium-containing wastewater, in particular to a sludge-based activated carbon and its production method and its application in electroplating chromium-containing wastewater. Background technique [0002] A large amount of chromium-containing wastewater is produced in the production process of the electroplating industry, which mainly exists stably in two valence states of hexavalent and trivalent. Cr(VI) is an acute carcinogen, and its toxicity is far greater than that of Cr(III). ) wastewater discharge and the removal of Cr(VI) in wastewater has become a research hotspot in the field of environment. At present, the main treatment methods for Cr(VI)-containing wastewater include chemical methods, adsorption methods, electrolytic reduction methods, and biological methods. The adsorption method has the advantages of simple operation, mature proc...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F11/00C02F11/12C01B31/08C01B31/12C02F1/28C02F1/62C01B32/324C01B32/342
Inventor 张伟蒋海燕杨柳
Owner HUNAN CITY UNIV
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