Method for preparing straw-sludge composite based activated carbon

Abstract

The invention relates to a preparation method of activated carbon, and particularly relates to a method for preparing composite based activated carbon by utilizing straws and sludge. The method for preparing the straw-sludge composite based activated carbon includes the following steps: respectively carrying out 105 DEG C vacuum drying and crushing of undigested dewatered sludge and the reed straws; mixing the vacuum dried and crushed sludge and the vacuum dried and crushed straws in the step (1) according to the mass ratio of 1:1 to 4:1, activating with a 0.5 mol / L KOH, centrifuging, and drying; carbonizing the dried sample in a resistance furnace for 2 to 6 h under the N2 gas atmosphere and at the temperature of 600 to 800 DEG C, repeatedly washing the prepared crude sample with water for 3 to 4 times, carrying out low temperature drying to reach constant weight, and thus obtaining a sample S1; and dipping the sample S1 with hydrochloric acid and heating to boil for 30 to 60 s, cooling, repeatedly washing with water for 3 to 4 times, carrying out low temperature drying to reach constant weight, and thus obtaining the sample S2.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing composite-based activated carbon by utilizing straw-sludge. Background technique [0002] Compared with traditional methods such as sludge incineration and landfill, sludge preparation of activated carbon technology is one of the effective ways of resource utilization of urban sewage treatment plant sludge, which is in line with the national energy conservation and emission reduction policy. However, due to the traditional sludge-based activated carbon It has the characteristics of low carbon content, high ash content, and high and unstable heavy metal content, which limits the application and development of sludge-based activated carbon. How to effectively increase the carbon content and specific surface area of ​​sludge-based activated carbon has become an important issue in urban sludge resource utilization. One of the research hotspots of techn...

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Problems solved by technology

[0002] Compared with traditional methods such as sludge incineration and landfill, sludge preparation of activated carbon technology is one of the effective ways of resource utilization of urban sewage treatment plant sludge, which is in line with the national energy conservation and emission reduction policy. However, due to the traditional sludge-based activated carbon It has the characteristics of low carbon content, high ash content, and high and unstable heavy metal content, which limits the application and development of sludge-based activated carbon. How to effectively increase the carbon content and specific surface area of ​​sludge-based activated carbon has become an important issue in urban sludge resource utilization. One of the research hotspots of technology, my country is a big country of straw production, a large amount of straw is burned every year, which has caused great harm to the environment, and also caused a huge waste of straw resources. Straw has a high carbon-nitrogen ratio and contains a lot of fiber. The straw used in the experiment has a carbon content as high as 44.6% after drying, which is much higher than that in dry sludge.

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