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Modified wood dust adsorbent for oil removal and preparation method for same

An oil adsorption and wood chip technology, applied in the field of water treatment, can solve the problems of high oil removal cost, difficult regeneration, poor treatment effect of oily sewage, etc.

Inactive Publication Date: 2013-07-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of biochemical treatment is low, but due to the poor bioactivity of oil products, the treatment effect of biochemical treatment on oily sewage is not good
The main methods of physical and chemical treatment of oily sewage include grid oil separation, coagulation sedimentation, coagulation air flotation, adsorption separation and other methods, among which the oil separation method is only suitable for a large amount of floating oil, and the oil removal is not complete; coagulation sedimentation , Coagulation air flotation can be applied to the removal of emulsified oil, but the generated waste residues need subsequent treatment, resulting in higher overall degreasing costs
Adsorption degreasing generally uses activated carbon as the degreasing adsorbent, which has a complete degreasing effect and no side effects on the water body, but the preparation cost of activated carbon is high and regeneration is difficult, so a disposable, effective and economical degreasing adsorbent is invented Means a lot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take the pine wood chips from which impurities have been removed, grind them, dry them in an oven at 110°C for 2 hours, screen out 100g of sawdust with a particle size of 0.3-0.5mm, put them in a nitrogen-protected muffle furnace, set the pyrolysis temperature at 240°C, and heat After 6 hours of decomposing time, the pyrolyzed modified sawdust was taken out, and the air was isolated to cool down to normal temperature to obtain 63.5 g of modified sawdust adsorbent with an adsorbent yield of 63.5%. It has been determined that the specific surface area of ​​the modified wood chips is 520m 2 / g.

[0016] Take 0.5g each of the original pine wood chips, granular activated carbon and the above-mentioned modified wood chips, add them to 100ml of lubricating oil wastewater with an initial concentration of 200mg / L, and after shaking and absorbing on a shaking table for 2 hours, measure the residual oil concentration in the supernatant as follows: Granular activated carbon The co...

Embodiment 2

[0018] Take the pine wood chips from which impurities have been removed, grind them, dry them in an oven at 80°C for 10 hours, and screen out 100g of sawdust with a particle size of 0.3-1.0mm, put them in a nitrogen-protected muffle furnace, set the pyrolysis temperature at 200°C, and heat After 10 hours of decomposing time, the pyrolyzed modified wood chips were taken out, and the air was isolated to cool down to normal temperature to obtain 79.3 g of modified wood chip adsorbents with an adsorbent yield of 79.8%. It has been determined that the specific surface area of ​​the modified wood chips is 253m 2 / g.

[0019] Take 0.5g each of the original pine sawdust, granular activated carbon and the above-mentioned modified sawdust, add it to 100ml of lubricating oil wastewater with an initial concentration of 500mg / L, and after shaking and absorbing on a shaking table for 2 hours, measure the remaining oil concentration in the supernatant as follows: Granular activated carbon T...

Embodiment 3

[0021] Take the pine wood chips from which impurities have been removed and grind them. After drying in an oven at 130°C for 1 hour, 100g of sawdust with a particle size of 0.5-2.0mm is screened out, and placed in a nitrogen-protected muffle furnace. The pyrolysis temperature is set at 350°C. After 2 hours of decomposing time, the pyrolyzed modified sawdust was taken out, the air was isolated and the temperature was lowered to normal temperature to obtain 56.3 g of modified sawdust adsorbent, and the yield of adsorbent was 56.3%. The specific surface area of ​​the modified sawdust was determined to be 565m 2 / g.

[0022] Take 0.5g each of the original pine sawdust, granular activated carbon and the above-mentioned modified sawdust, add it to 100ml of lubricating oil wastewater with an initial concentration of 500mg / L, and after shaking and absorbing on a shaking table for 4 hours, measure the remaining oil concentration in the supernatant as follows: Granular activated carbon ...

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Abstract

The invention discloses a modified wood dust adsorbent for oil removal and a preparation method for the same, and belongs to the technical field of water treatment. The preparation method comprises the following steps of: crushing the wood dust after impurity removal until the grain diameter is less than 5 mm, drying to remove water in the wood dust, and controlling the drying temperature to be 80-130 DEG C; placing the wood dust in an airtight pyrolyzing furnace, adding a protective gas and performing pyrolyzing protection, controlling the temperature to be 200-350 DEG C, and controlling the pyrolyzing time to be 2-10 hours; and taking out the pyrolyzed modified wood dust, isolating air, cooling to a room temperature, and then obtaining the modified wood dust adsorbent. According to the preparation method disclosed by the invention, after the wood dust is modified, the surface hydrophobicity is enhanced; and moreover, the microcellular structure of the wood dust is changed, and then the adsorption effect of the wood dust is enhanced.

Description

technical field [0001] The invention relates to a sawdust modified degreasing adsorbent and a preparation method thereof, which belongs to the technical field of water treatment and is suitable for degreasing and purifying oily sewage. Background technique [0002] With the rapid development of economic activities, the use of various oil products has increased, and the problem of water pollution by oil products has become increasingly prominent. Oil products are generally divided into two categories: mineral oil and animal and vegetable oil. All oils have the same characteristics, that is, they are difficult to be compatible with water, and most oil products are lighter than water in density and difficult to biodegrade. As a result, the oily pollution floats on the water surface to form an oil film, which not only affects the water body landscape, but also destroys the reoxygenation process between the water body and the air, resulting in a rapid deterioration of water quali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/40
Inventor 丁文明
Owner BEIJING UNIV OF CHEM TECH