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CN-121990570-A - Activated carbon doped with organic matters by biochemical sludge and preparation method thereof

CN121990570ACN 121990570 ACN121990570 ACN 121990570ACN-121990570-A

Abstract

The invention discloses an activated carbon doped with organic matters in biochemical sludge and a preparation method thereof, wherein the preparation method comprises the following steps of carrying out dewatering pretreatment on the biochemical sludge, fully mixing the biochemical sludge with the organic matters, and then drying and crushing the mixture to obtain standby sludge particles; the method comprises the steps of carbonizing standby sludge particles at constant temperature, grinding to obtain carbonized material powder, mixing the carbonized material powder with an activating agent, adding the mixture into deionized water, heating the mixture in a water bath for reaction, filtering and drying the product, activating the product at constant temperature under the protection of inert gas to obtain an activated product, placing the activated product into concentrated acid for ultrasonic treatment, and then washing, drying and crushing the activated product to obtain the activated product.

Inventors

  • LI YOUCHEN
  • HE QINGSHENG
  • FAN JINGFU
  • LI LINA
  • XIAO XIANGQUN
  • YUAN SHAOYU

Assignees

  • 中国石油化工股份有限公司
  • 中石化炼化工程（集团）股份有限公司

Dates

Publication Date
20260508
Application Date
20241107

Claims (10)

  1. 1. The preparation method of the activated carbon doped with organic matters by biochemical sludge comprises the following steps: (1) Dewatering biochemical sludge, fully mixing the biochemical sludge with organic matters, drying the biochemical sludge to constant weight, crushing and sieving the biochemical sludge to obtain spare sludge particles; (2) Placing the spare sludge particles in a high-temperature tubular furnace, carbonizing at constant temperature under the protection of inert gas, cooling to room temperature under the protection of inert gas after carbonizing, taking out and grinding into powder to obtain carbonized material powder; (3) Mixing carbonized material powder with an activating agent, adding the mixture into deionized water, uniformly dispersing the mixture under the action of ultrasound, fully soaking the mixture, heating the mixture in a water bath for reaction, and filtering and drying a product; (4) Placing the product obtained in the step (3) in a high-temperature tube furnace, activating at constant temperature under the protection of inert gas, and continuously cooling to room temperature under the protection of inert gas after the activation is finished to obtain an activated product; (5) And (3) placing the activated product in concentrated acid for ultrasonic treatment, washing, drying, taking out, crushing and grinding to obtain the activated carbon doped with organic matters in the biochemical sludge.
  2. 2. The preparation method of the biochemical sludge according to claim 1, wherein in the step (1), the organic matter is one or more of straw, leaves, coconut shells, waste paper and rice hulls, and the mass ratio of the organic matter to the biochemical sludge after dehydration pretreatment is 10-40:100.
  3. 3. The preparation method of the biochemical sludge according to claim 1, wherein in the step (1), the water content of the biochemical sludge after dehydration is kept at 50-80 wt%, the biochemical sludge is dried in a drying oven at 100-105 ℃ for 12-24 hours, and the biochemical sludge is crushed to 60-100 meshes.
  4. 4. The method according to claim 1, wherein in the step (2), the carbonization condition is that the temperature is raised to 350-500 ℃ at a temperature raising rate of 2-10 ℃ per minute, and the carbonization is performed for 1-2 hours at constant temperature.
  5. 5. The method according to claim 1, wherein in the step (3), the activator is one or more of zinc chloride, potassium hydroxide and sodium hydroxide.
  6. 6. The preparation method of the catalyst according to claim 1, wherein in the step (3), the mass ratio of the carbonized material powder to the activator is 1:1-5, the dosage ratio of the carbonized material powder to the deionized water is 1 g:50-150 mL, the water bath heating reaction condition is that the water bath heating is carried out at 60-80 ℃ for 10-15 h, and the drying condition is that the drying is carried out at 100-105 ℃ for 2-4 h.
  7. 7. The method according to claim 1, wherein in the step (4), the activation condition is to heat up to 600 to 800 ℃ at a heating rate of 2 to 10 ℃ per minute, and activate for 1 to 2 hours at a constant temperature.
  8. 8. The preparation method of the composite material according to claim 1, wherein in the step (5), the ultrasonic treatment time is 10-30 min, the deionized water is used for washing at 80 ℃, the drying condition is 105 ℃ for 10-15 h, and the composite material is ground and sieved by a 100-200-mesh sieve.
  9. 9. The preparation method of claim 1, wherein in the step (5), the concentrated acid is concentrated hydrochloric acid and/or concentrated nitric acid, and the mass fraction of the concentrated acid is 15-40%.
  10. 10. An activated carbon doped with organic matters by using the biochemical sludge prepared by the preparation method of any one of claims 1 to 9.

Description

Activated carbon doped with organic matters by biochemical sludge and preparation method thereof Technical Field The invention relates to the technical field of biochemical sludge treatment, in particular to activated carbon doped with organic matters by biochemical sludge and a preparation method thereof. Background With the acceleration of the urban process in China, the increase of urban industry and population is continuously testing the bearing capacity of urban environment. In order to improve urban living environment, a large number of urban sewage treatment plants are newly built, and meanwhile, old sewage treatment plants are upgraded and reformed, which inevitably leads to rapid increase of sludge. The sludge usually contains heavy metal elements and various pathogenic microorganisms, the direct recycling difficulty is high, and considering that the sludge contains a large amount of organic matters, the sludge activated carbon with good adsorption performance prepared by carbonizing the surplus sludge can realize sludge reduction, recycling and harmless treatment, so that the aim of comprehensively utilizing dangerous wastes is fulfilled. The sludge activated carbon is used for replacing the traditional activated carbon, has good economic and social benefits for adsorbing and removing pollutants in water and the atmosphere, and has attracted high attention from researchers at home and abroad at present. Therefore, the invention provides a method for preparing activated carbon by doping organic matters into biochemical sludge, which prepares the sludge activated carbon by carrying out dehydration carbonization treatment on the biochemical sludge and then carrying out activation modification by adding an activating agent. Disclosure of Invention In order to solve the defects in the prior art, the invention aims to provide the activated carbon doped with the organic matters by the biochemical sludge and the preparation method thereof, and the activated carbon material with stable structure, strong adsorptivity and large specific surface area is effectively prepared. In order to achieve the above purpose, the present invention adopts the following technical scheme: the preparation method of the activated carbon doped with organic matters by biochemical sludge comprises the following steps: (1) Dewatering biochemical sludge, fully mixing the biochemical sludge with organic matters, drying the biochemical sludge to constant weight, crushing and sieving the biochemical sludge to obtain spare sludge particles; preferably, in the step (1), the organic matter is one or more of straw, leaf, coconut shell, waste paper and rice husk, and the mass ratio of the organic matter to the biochemical sludge after dehydration pretreatment is 10-40:100. Preferably, in the step (1), the water content of the dehydrated biochemical sludge is kept at 50-80 wt%, the biochemical sludge is dried in a drying oven at 100-105 ℃ for 12-24 hours, and the biochemical sludge is crushed to 60-100 meshes. (2) Placing the spare sludge particles in a high-temperature tubular furnace, carbonizing at constant temperature under the protection of inert gas, cooling to room temperature under the protection of inert gas after carbonizing, taking out and grinding into powder to obtain carbonized material powder; preferably, in the step (2), the carbonization condition is that the temperature is raised to 350-500 ℃ at the temperature rising rate of 2-10 ℃ per minute, and the carbonization is carried out for 1-2 hours at constant temperature. Preferably, in the step (2), the inert gas is one or more of high-purity nitrogen, high-purity argon and high-purity carbon dioxide. (3) Mixing carbonized material powder with an activating agent, adding the mixture into deionized water, uniformly dispersing the mixture under the action of ultrasound, fully soaking the mixture, heating the mixture in a water bath for reaction, and filtering and drying a product; preferably, in the step (3), the activator is one or more of zinc chloride, potassium hydroxide and sodium hydroxide. Preferably, in the step (3), the mass ratio of the carbonized material powder to the activating agent is 1:1-5, the dosage ratio of the carbonized material powder to the deionized water is 1 g:50-150 mL, the water bath heating reaction condition is that the water bath heating is carried out at 60-80 ℃ for 10-15 h, and the drying condition is that the drying is carried out at 100-105 ℃ for 2-4 h. (4) Placing the product obtained in the step (3) in a high-temperature tube furnace, activating at constant temperature under the protection of inert gas, and continuously cooling to room temperature under the protection of inert gas after the activation is finished to obtain an activated product; Preferably, in the step (4), the activation condition is that the temperature is raised to 600-800 ℃ at the temperature rising rate of 2-10 ℃ per minute, and the activation is performed for 1-2 hours