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Sludge activated carbon with continuous pore size distribution and preparation method thereof

A sludge activated carbon and sewage treatment technology, applied in the field of environmental resource utilization, can solve the problems of lack of microporous structure, difficulty in achieving efficient adsorption of heavy metal ions and macromolecular pollutants, etc., to reduce preparation costs, promote pore development, and avoid carbon pollution. loss effect

Active Publication Date: 2019-04-05
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sludge activated carbon prepared by the existing activation method mostly has a mesopore structure and lacks a micropore structure, so it is difficult to achieve efficient adsorption of heavy metal ions and macromolecular pollutants at the same time

Method used

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  • Sludge activated carbon with continuous pore size distribution and preparation method thereof
  • Sludge activated carbon with continuous pore size distribution and preparation method thereof
  • Sludge activated carbon with continuous pore size distribution and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Immerse the sludge powder into the compound activator solution, the ratio of solid mass to solution volume is 1:2, and immerse at 20 degrees Celsius for 12 hours; the compound activator includes ZnCl 2 , phosphoric acid, K 2 S and NaCl, among which ZnCl 2 Concentration is 2mol / L, phosphoric acid concentration is 3mol / L, K 2 The addition amount of S is 10% of the dry sludge mass, and the NaCl addition amount is 1% of the dry sludge mass. Dry the mixture to a moisture content of 8%, add coal tar, the mass ratio of the mixture to coal tar is 1:0.3; granulate into a cylinder with a diameter of 8 mm and a length of 15 mm. Under the condition of nitrogen flow rate of 350ml / min, 35g of molding raw material was heated from room temperature of 20°C to 550°C at a rate of 10°C / min, and stayed for 1.5h. Then with a heating rate of 15°C / min, the temperature was raised to 800°C, and a mixed gas of water vapor and nitrogen was introduced simultaneously, the flow rate was 350ml / min,...

Embodiment 2

[0037] Immerse the sludge powder into the compound activator solution, the ratio of solid mass to solution volume is 1:2.5, and immerse at 20 degrees Celsius for 8 hours; the compound activator includes ZnCl 2 , phosphoric acid, K 2 S and NaCl, among which ZnCl 2 Concentration is 2.5mol / L, phosphoric acid concentration is 2mol / L, K 2 The addition amount of S is 15% of the dry sludge mass, and the NaCl addition amount is 2% of the dry sludge mass. Dry the mixture to a moisture content of 8%, add coal tar, the mass ratio of the mixture to coal tar is 1:0.35; granulate into a cylinder with a diameter of 8 mm and a length of 15 mm. Under the condition of nitrogen flow rate of 350ml / min, 52.5g of molding raw material was heated from room temperature of 25°C to 650°C at a rate of 15°C / min, and stayed for 1h. Then with a heating rate of 12° C. / min, the temperature is raised to 700° C., and a mixed gas of water vapor and nitrogen is introduced simultaneously, the flow rate is 350 m...

Embodiment 3

[0039] Immerse the sludge powder into the compound activator solution, the ratio of solid mass to solution volume is 1:2, and immerse at 20 degrees Celsius for 12 hours; the compound activator includes ZnCl 2 , phosphoric acid, K 2 S and NaCl, among which ZnCl 2 Concentration is 1mol / L, phosphoric acid concentration is 5mol / L, K 2 The addition amount of S is 8% of the dry sludge mass, and the NaCl addition amount is 0.5% of the dry sludge mass. Dry the mixture to a moisture content of 6%, add coal tar, the mass ratio of the mixture to coal tar is 1:0.2; granulate into a cylinder with a diameter of 8 mm and a length of 15 mm. Under the condition of nitrogen flow rate of 350ml / min, 40g of molding raw material was heated from room temperature of 20°C to 450°C at a rate of 8°C / min, and stayed for 2.5h. Then with a heating rate of 20° C. / min, the temperature is raised to 850° C., and a mixed gas of water vapor and nitrogen is introduced simultaneously, the flow rate is 350 ml / mi...

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Abstract

The invention discloses sewage treatment sludge active carbon having continuous pore size distribution, and a preparation method thereof. According to the preparation method, ZnCl2, phosphoric acid, K2S and NaCl form a compound activator in anoxic atmosphere to activate sludge, wherein the mesoporous structure is developed mainly by using the phosphoric acid, and the K<+> content and the Na<+> content of the sludge active carbon are increased so as to easily enhance the replacement with heavy metal ions in sewage; and activation is performed with water vapor to generate rich micro-pores in the mesoporous surface, such that the BET specific surface area of the finally obtained sludge active carbon is not less than 400 m<2> / g, and the pore size is continuously distributed within 0.5-50 nm. According to the present invention, the prepared sludge active carbon adopted as the sewage treatment adsorbent adsorbs heavy metal ions using Pb<2+> as the representative and macromolecular pollutants in the sewage, and has good effects.

Description

technical field [0001] The invention belongs to the technical field of environmental resource utilization, and more specifically relates to a method for preparing active carbon from sludge and using the active carbon for sewage treatment. Background technique [0002] The preparation of activated carbon usually uses carbonaceous raw materials such as coal, wood, and fruit shells. Due to the impact of resources and environmental protection, the production cost of activated carbon has increased year by year. Sludge contains a large amount of organic matter and high carbon content, so it has the objective conditions for preparing activated carbon. Using sludge as raw material to prepare activated carbon can effectively reduce the cost of raw materials, and at the same time allow the sludge itself to be disposed of reasonably and realize resource utilization. The carbonized sludge has a solidification effect on its own heavy metals, and can be used as an adsorbent for sewage tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/28C01B32/342C02F1/28C02F11/10C02F11/00
CPCB01J20/20B01J20/28061B01J20/28071B01J20/2808B01J20/28083B01J2220/42B01J2220/4806B01J2220/4887C02F1/283C02F11/00C02F11/10C02F2101/20C02F2303/06
Inventor 朱玉雯李浩宇刘汉桥刘翠萍
Owner TIANJIN CHENGJIAN UNIV
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