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Method for removing crystal violet dye in water by adopting sludge-based biomass hydrothermal carbon adsorbent

A biomass and hydrothermal carbon technology, applied in the fields of adsorption water/sewage treatment, water/sludge/sewage treatment, water pollutants, etc. Problems such as poor biological availability of sludge, to achieve the effects of water environmental protection, low cost, and resource utilization

Inactive Publication Date: 2017-08-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The bioavailability of urban sludge is poor, the water content is as high as 99%, and most of it is cell-bound water, and it is difficult to remove it by conventional methods, which greatly restricts the transportation and resource utilization of excess sludge

Method used

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  • Method for removing crystal violet dye in water by adopting sludge-based biomass hydrothermal carbon adsorbent
  • Method for removing crystal violet dye in water by adopting sludge-based biomass hydrothermal carbon adsorbent
  • Method for removing crystal violet dye in water by adopting sludge-based biomass hydrothermal carbon adsorbent

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Example 1: The sludge is centrifuged for preliminary dehydration, dried, ground, and sieved to 350-850 μm for later use. Weigh 50g of sludge particles, add 450ml of water, adjust the pH value of the mud-water mixture solution to 9 with 0.1mol / L HCl and NaOH solution, react at 180°C for 3h, take out the product and centrifuge to separate the solid and liquid, and then After washing several times with water, the solid was taken out and dried at 105° C. for 24 hours to obtain No. 1 sludge-based biomass hydrothermal carbon adsorbent with a yield of 44.80%.

[0024] Take No. 1 sludge-based biomass hydrothermal carbon adsorbent and add it to crystal violet dye water with an initial concentration of 150mg / L. The solutions correspond to 0.05, 0.10, 0.15, 0.20, and 0.25 g of adsorbents respectively, shake and adsorb at 20°C for 24 hours, and centrifuge to separate solid and liquid. Collect the liquid into the waste container for unified disposal.

[0025] The effect of adsorbe...

example 2

[0026] Example 2: Centrifuge the sludge for preliminary dehydration, dry, grind, and sieve to 350-850 μm for later use. Weigh 50g of sludge particles, add 450ml of water, adjust the pH value of the mud-water mixture solution to 7 with 0.1mol / L HCl and NaOH solution, react at 180°C for 3h, take out the product and centrifuge to separate the solid and liquid, and then Wash several times with water, take out the solid and dry at 105°C for 24 hours to obtain No. 2 sludge-based biomass hydrothermal carbon adsorbent with a yield of 44.50%.

[0027] Take No. 2 sludge-based biomass hydrothermal carbon adsorbent and add it to crystal violet dye water with an initial concentration of 150mg / L. The dosage of adsorbent is 6g / L, that is, 25ml crystal violet solution corresponds to 0.15g adsorbent, respectively 10, 15, 20, 25, 30°C, shake and adsorb for 24 hours, and centrifuge to separate solid and liquid. Collect the liquid into the waste container for unified disposal.

[0028] The effe...

example 3

[0029] Example 3: Centrifuge the sludge for preliminary dehydration, dry, grind, and sieve to 350-850 μm for later use. Weigh 100g of sludge particles, add 400ml of water, adjust the pH value of the mud-water mixture solution to 9 with 0.1mol / L HCl and NaOH solution, react at 180°C for 3h, take out the product and centrifuge to separate the solid and liquid, and then After washing several times with water, the solid was taken out and dried at 105° C. for 24 hours to obtain No. 3 sludge-based biomass hydrothermal carbon adsorbent with a yield of 46.20%.

[0030] Take No. 3 sludge-based biomass hydrothermal carbon adsorbent and add it to crystal violet dye water with an initial concentration of 50, 100, 150, 200, and 250mg / L. The dosage of the adsorbent is 6g / L, that is, 25ml crystal violet solution Corresponding to 0.15g of adsorbent, shake and adsorb at 20°C for 24 hours, and centrifuge to separate solid and liquid. Collect the liquid into the waste container for unified disp...

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Abstract

The invention discloses a method for removing a crystal violet dye in water by adopting a sludge-based biomass hydrothermal carbon adsorbent and belongs to the field of water treatment. The method comprises the steps of centrifuging sludge, carrying out preliminary dehydration, drying, grinding and sieving until the particle sizes are 350-850 microns; weighing 25-100g of sludge particles, adding 400-475ml of water to prepare a sludge-water mixed solution; adjusting the pH value of the sludge-water mixed solution to be 5-9 by using HCl and NaOH solutions, putting the mixed solution into a reaction kettle, covering a reaction kettle cover, introducing nitrogen into the reaction kettle for 3min and forming an oxygen-free environment in a kettle body; reacting at 180-240 DEG C for 3-9h to generate sludge-based biomass hydrothermal carbon; and centrifuging and cleaning by using water for multiple times, and drying to obtain the sludge-based biomass hydrothermal carbon adsorbent. The method is simple in operation, low in cost and free of secondary pollution, and has an industrialization prospect. The environmental load is reduced, meanwhile, a new way is provided for utilization of municipal sludge, and resource utilization of the sludge and water environment protection are achieved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for removing crystal violet dye in water by utilizing a sludge-based biomass hydrothermal carbon adsorbent. Background technique [0002] At present, many synthetic dyes enter water through various channels (textile, leather, paper, printing, food, cosmetics, paint, pigment, petroleum, solvent, rubber, plastic, pesticide, etc.), generally speaking, containing 10-200mg / L Discharge of dyes into natural waters can be toxic, carcinogenic or mutagenic to living organisms. Dyes are difficult to decolorize due to their complex structure and refractory properties, which makes it necessary to remove the dye from water. [0003] As a typical cationic dye, crystal violet (CV) has many uses: biological dyeing agent, used for the treatment of skin diseases, additive for livestock and poultry feed to inhibit the reproduction of mold, eliminate intestinal parasites...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/30B01J20/20C02F11/10C10B53/00C02F101/30C02F101/36C02F101/38
CPCB01J20/20B01J2220/4887C02F1/283C02F11/10C02F2101/308C02F2101/36C02F2101/38C10B53/00
Inventor 魏佳刘亦陶李媛
Owner BEIJING UNIV OF TECH
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