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Preparation method of straw anaerobic fermentation residue active carbon for processing cadmium-containing waste water

An anaerobic fermentation and activated carbon technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the impact on the environment and human and animal health, limit the utilization of biogas residue resources, and biogas residue Seasonal surplus and other problems, to achieve the effect of simple and easy process, good application prospect and good adsorption effect

Active Publication Date: 2014-02-26
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain safety hazards in the utilization of biogas residues, such as biogas residues containing a certain amount of hormones, pathogenic microorganisms, heavy metals, etc., which may have an impact on the environment and the health of humans and animals
When biogas residue is used as agricultural fertilizer, there are still disadvantages such as inconvenient transportation, inconvenient use, and poor fertilizer efficiency. In addition, the demand for fertilizers by crops has a certain seasonality, which will lead to seasonal surplus of biogas residue
These factors limit the resource utilization of biogas residues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Wash the rice straw anaerobic fermentation slag with distilled water, cut it into 2-4 cm long sections, dry it at 105°C for 24 hours, crush the rice straw anaerobic fermentation slag with a pulverizer after drying, and pass through a 20-mesh sieve to obtain the rice straw anaerobic fermentation slag. Oxygen fermented slag powder. Mix the obtained rice straw anaerobic fermentation slag powder with 10% potassium hydroxide solution in a mass ratio of 1:1, stir evenly, then oscillate and impregnate at a speed of 120r / min for 6 hours, after the oscillation is completed, use gauze to filter out the remaining Infiltrate. Put the impregnated rice straw anaerobic fermentation slag powder in a vacuum drying oven, and bake it at 105°C for 12 hours. After the temperature of the muffle furnace rises to the required activation temperature of 450°C, put the dried straw anaerobically Put the fermented slag powder into the muffle furnace and keep the temperature constant for 60 minutes...

Embodiment 2

[0024] Wash the rice straw anaerobic fermentation slag with distilled water, cut it into 2-4 cm long sections, dry it at 105°C for 24 hours, crush the rice straw anaerobic fermentation slag with a pulverizer after drying, and pass through a 20-mesh sieve to obtain the rice straw anaerobic fermentation slag. Oxygen fermented slag powder. Mix the obtained rice straw anaerobic fermentation slag powder with 10% potassium hydroxide solution in a mass ratio of 1:1, stir evenly, then oscillate and impregnate at a speed of 120r / min for 12 hours, after the oscillation is completed, use gauze to filter out the residual Infiltrate. Put the impregnated rice straw anaerobic fermentation slag powder in a vacuum drying oven, and bake it at 105°C for 12 hours. After the temperature of the muffle furnace rises to the required activation temperature of 450°C, put the dried straw anaerobically Put the fermented slag powder into the muffle furnace and keep the temperature constant for 60 minutes...

Embodiment 3

[0026] Wash the anaerobic fermentation residue of rice straw with distilled water, cut it into small sections with a length of 2 to 4 cm, and dry it at 110° C. for 24 hours. Oxygen fermented slag powder. Mix the obtained rice straw anaerobic fermentation slag powder with 10% potassium hydroxide solution in a mass ratio of 1:1, stir evenly, then vibrate and impregnate at a speed of 120r / min for 3 hours, after the oscillation is completed, filter off the remaining Infiltrate. Put the impregnated rice straw anaerobic fermentation slag powder in a vacuum drying oven, and bake it at 105°C for 12 hours. After the temperature of the muffle furnace rises to the required activation temperature of 450°C, put the dried straw anaerobically Put the fermented slag powder into the muffle furnace and keep the temperature constant for 40 minutes. After cooling, pickle with 1M hydrochloric acid to remove the contained metal compound impurities, and then continue to wash the sample with hot di...

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Abstract

The invention discloses a preparation method of straw anaerobic fermentation residue active carbon for processing cadmium-containing waste water, which comprises the following steps: cleaning, cutting, drying, crushing, and sieving straw anaerobic fermentation residues, soaking the residues with a potassium hydroxide solution with a mass fraction of 5-20% at a vibration rotating speed of 100-120 r / min for 3-12 hours, wherein the mass ratio of the potassium hydroxide to the straw anaerobic fermentation residue powder is 0.5-4:1, drying, performing activation in a muffle furnace for 30-60 min at a temperature of 400-550 DEG C, washing with hot distilled water at 70-80 DEG C to obtain a pH of 5-6, drying the obtained product, grinding the product to obtain a particle mesh size of less than 150 meshes. The active carbon prepared in the invention has good processing effect on cadmium-containing waste water, has a theoretical saturated adsorption capacity of cadmium ions of 20.79-66.22 mg / g which is far higher than that of common commercial active carbon. The process of the invention is simple and practical, low in cost, less in pollution, and good in adsorption effect on metal ions, and thus has good application prospects.

Description

technical field [0001] The invention relates to a preparation method of activated carbon, in particular to a preparation method of rice straw anaerobic fermentation residue activated carbon capable of treating cadmium-containing wastewater. Background technique [0002] Rice straw is the largest crop straw in my country, and its output accounts for more than a quarter of the total crop straw output. Rice straw is an important biological resource in the crop production system. It is mainly composed of cellulose, hemicellulose, and lignin. It is also an organic substance with abundant storage, low price, and annual regeneration. Rice straw used to be an indispensable material for production and living in the vast rural areas of China. However, in the past two decades, with the improvement of farmers' living standards, the improvement of rural energy structure and the application of various alternative raw materials, there has been a surplus of straw led by rice straw. , a lar...

Claims

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Application Information

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IPC IPC(8): C01B31/08C02F1/28C02F101/20C01B32/324C01B32/348
Inventor 方彩霞付津宇叶良涛
Owner ANHUI NORMAL UNIV
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