Method for preparing activated carbon by physical activation of excess sludge

A technology for preparing activated carbon and excess sludge, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve problems such as the shutdown of sewage treatment plants, and achieve the effect of efficient utilization and low energy consumption

Inactive Publication Date: 2012-05-02
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the difficulty in finding temporary landfill sites, some sewage treatment plants are even facing a crisis of shutting down

Method used

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  • Method for preparing activated carbon by physical activation of excess sludge
  • Method for preparing activated carbon by physical activation of excess sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, after mechanical dehydration, the residual sludge of a petrochemical company with a mass moisture content of 75% was taken, and the exhaust gas from the activation furnace was dried at 110°C until the mass moisture content was 25%, and then 5% (mass percent) of coal powder and 5% (mass percent) of coal tar, after stirring and mixing, they are extruded under a pressure of 50 MPa; the molding materials are dried at 110°C for 6 hours with exhaust gas from an activation furnace, and the dried materials are transported to carbonization The furnace is carbonized at 350°C for 2 hours, and the carbonized material is transported to the activation furnace where water vapor is fed (the tail gas in the carbonization furnace is sent to the waste heat boiler for combustion through the induced draft fan, and the heat generated is heated by water) for activation at 700°C for 3 hours, and the output of the activation furnace is screened Activated carbon is obt...

Embodiment 2

[0025] Such as figure 1 As shown, after mechanical dehydration, the residual sludge of a sewage treatment plant in a pharmaceutical and chemical plant with a mass moisture content of 85% was taken. After belt filter press, the moisture content was 85%, and the exhaust gas from the activation furnace was dried at 120°C to the mass moisture content 40%, then add coal powder and 1% (mass percentage) coal tar that account for 10% (mass percentage) of the absolute dry sludge, after stirring and mixing, under 150MPa pressure, extrusion molding; The exhaust gas from the activation furnace is dried at 120°C for 2 hours, the dried material is transported to the carbonization furnace for carbonization at 500°C for 0.5 hours, and the carbonized material is transported to the steam (the exhaust gas in the carbonization furnace is sent to the waste heat boiler for combustion through the induced draft fan, and the heat generated heats the water produced) in the activation furnace at 850°C f...

Embodiment 3

[0027] Such as figure 2 As shown, after mechanical dehydration, take the residual sludge of a domestic sewage treatment plant with a mass moisture content of 85%, add 4% (mass percentage) of sawdust and 3% (mass percentage) of coal tar, and stir, After mixing, extrude under the pressure of 100MPa; use the exhaust gas from the activation furnace to dry at 110°C for 4 hours, and transport the dried material to the carbonization furnace for carbonization at 500°C for 0.5 hours. The exhaust gas is sent to the waste heat boiler for combustion through the induced draft fan, and the heat generated is generated by heating water) The activation furnace is activated at 950°C for 1 hour, and the output of the activation furnace is screened to obtain activated carbon. After testing, its specific surface area: 336m 2 / g, iodine value: 422mg / g, strength 91%.

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Abstract

The invention relates to a recycling disposal of industrial solid waste, in particular a method for preparing activated carbon by physical activation of excess sludge. The method comprises taking excess sludge generated by sewage treatment as raw material, utilizing water vapour as activating gas and preparing sludge activated carbon by physical activation. The invention takes large amount of excess sludge generated by sewage treatment as raw material to prepare activated carbon and realizes highly efficient utilization of energy resources by multi-type excess heat recycling, therefore, the generated activated carbon product has low energy consumption. Compared with chemical activation, the physical activation has no large amount of waste water generation during the preparation process and the production process is clean and environment friendly. The invention has excellent economic, ecological and social benefits.

Description

technical field [0001] The invention relates to resource disposal of industrial solid waste, in particular to a method for preparing activated carbon by physical activation of excess sludge. Background technique [0002] Sludge refers to the sewage sludge generated during the sewage treatment process of the sewage treatment plant, mainly including the primary sludge generated in the primary sedimentation tank and the residual sludge generated in the biological treatment structure. [0003] Due to the high moisture content and large volume of sludge, it not only occupies a large amount of land resources in the process of disposal, but also easily leaks and pollutes the surrounding environment during the transfer process; at the same time, the sludge contains a large amount of organic matter. Corruption will occur in an anaerobic environment, and bad odors such as hydrogen sulfide and methyl mercaptan will be produced. In addition, the sludge also contains toxic and harmful s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/10C01B32/336
CPCY02P20/129
Inventor 徐炎华胡俊赵贤广
Owner NANJING UNIV OF TECH
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