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Preparation method of biomass charcoal-based magnetic activated sludge and application of biomass charcoal-based magnetic activated sludge to uranium-bearing wastewater treatment

A biochar and activated sludge technology, applied in radioactive purification, alkali metal compounds, other chemical processes, etc., can solve problems such as unstable structure, reduced specific surface area, low magnetic strength, etc. It is easy to achieve and overcome the heating conditions The effect of low porosity and mild reaction conditions

Active Publication Date: 2016-05-25
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, during the preparation of magnetic activated sludge, some physical and chemical binders are usually used to magnetically fix it, and the existence of these chemical binders will easily cause the blockage of the pores of magnetic activated sludge. A little careless operation can easily reduce its specific surface area, and it is difficult for magnetic materials to organically combine with the activated sludge structure, but it is only distributed on the surface of the activated sludge structure or the surface wall in the pores, the structure is unstable, and it is easy to cause pores. clogging again, thereby reducing its specific surface area
At the same time, most of the current magnetic activated sludge has small magnetic strength and poor magnetic properties.

Method used

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  • Preparation method of biomass charcoal-based magnetic activated sludge and application of biomass charcoal-based magnetic activated sludge to uranium-bearing wastewater treatment
  • Preparation method of biomass charcoal-based magnetic activated sludge and application of biomass charcoal-based magnetic activated sludge to uranium-bearing wastewater treatment

Examples

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Effect test

Embodiment 1

[0038] (1) Preparation of biochar

[0039] After the rice husk is dried under natural conditions, it is pulverized by a pulverizer, put into a muffle furnace at 400°C, decomposed by heat under anaerobic sealing conditions, and then left at a constant temperature, cooled, and ground to obtain powdery biomass carbon.

[0040] (2) Biomass carbon-based magnetic nano-Fe 3 o 4 preparation of

[0041] Weigh 1.5g FeSO 4 .7H 2 O and 2.9gFeCl 3 .6H 2 O, and according to Fe 2+ with Fe 3+ The molar ratio of the solution is 1:2, put it in a 500mL three-neck beaker with 150mL deionized water, add 1.5g sucrose, and then place it in a constant temperature water bath at 50°C for 30min with magnetic stirring to form a uniformly mixed iron ion solution. Then add 6g of biomass carbon powder to the iron ion solution, continue magnetic stirring at room temperature for 20 minutes, and add ammonia water with a mass concentration of 25% dropwise as a precipitant, adjust the pH value of the so...

Embodiment 2

[0050] (1) Preparation of biochar

[0051] After the peanut shells are dried under natural conditions, crushed by a pulverizer, placed in a muffle furnace at 350°C, decomposed by heat under anaerobic sealing conditions, left at a constant temperature, cooled, and ground to obtain powdery biomass charcoal .

[0052] (2) Biomass carbon-based magnetic nano-Fe 3 o 4 preparation of

[0053] Weigh 1.495g FeSO 4 .7H 2 O and 1.45gFeCl 3 .6H 2 O, and according to Fe 2+ with Fe 3+ The molar ratio of the solution is 1:1, put it in a 500mL three-neck beaker filled with 150mL deionized water, add 1g of glucose, and then place it in a constant temperature water bath at 50°C for 30min with magnetic stirring to form a uniformly mixed iron ion solution. Then add 5.5g of biochar powder to the iron ion solution, continue magnetic stirring at room temperature for 20min, and add dropwise ammonia water with a mass concentration of 25% as a precipitant, adjust the pH value of the solution t...

Embodiment 3

[0062] (1) Preparation of biochar

[0063] After the sawdust is dried in the sun under natural conditions, it is pulverized by a pulverizer, put into a muffle furnace at 450°C, decomposed by heat under anaerobic sealing conditions, left at a constant temperature, cooled, and ground to obtain powdery biomass carbon.

[0064] (2) Biomass carbon-based magnetic nano-Fe 3 o 4 preparation of

[0065] Weigh 1.495g FeSO 4 .7H 2 O and 2.17 g FeCl 3 .6H 2 O, and according to Fe 2+ with Fe 3+ The molar ratio is 1:1.5, placed in a 500mL three-neck beaker filled with 150mL deionized water, and then 2g of maltose was added, and then placed in a constant temperature water bath at 50°C for 30min with magnetic stirring to form a uniformly mixed iron ion solution. Then add 5g of biomass charcoal powder to the iron ion solution, continue magnetic stirring at room temperature for 20min, and add ammonia water with a mass concentration of 25% dropwise as a precipitant, adjust the pH value ...

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Abstract

The invention relates to a preparation method of biomass charcoal-based magnetic activated sludge and application of the biomass charcoal-based magnetic activated sludge to uranium-bearing wastewater treatment. The preparation method of the biomass charcoal-based magnetic activated sludge and application of the biomass charcoal-based magnetic activated sludge to uranium-bearing wastewater treatment have the advantages that the biomass charcoal-based magnetic activated sludge high in porosity, large in specific surface area, few in macroscopic defects and stable in structure is mainly prepared from cheap natural resource biomass, waste beer yeast mycelia, activated sludge of sewage treatment plants and starch and is applied to remove uranium from low-concentration uranium-bearing wastewater; the biomass charcoal-based magnetic activated sludge is free from toxicity and pollution to the environment, so that natural resource recycling is achieved; the preparation method is simple and mild in reaction condition, and the biomass charcoal-based magnetic activated sludge can enable the concentration of the uranium of the low-concentration uranium-bearing wastewater to be decreased from 0.45-0.50mg / L to be below the national discharge standard of 0.05mg / L, thereby being suitable for environmental modification of various low-concentration uranium-polluted water bodies such as the uranium-bearing wastewater produced by uranium mines and uranium hydrometallurgy plants as well as uranium ore and uranium tailing pond lixivia.

Description

technical field [0001] The invention belongs to the field of resource utilization and environmental protection, in particular to a preparation method of biomass carbon-based magnetic activated sludge and its application in the treatment of uranium-containing wastewater. Background technique [0002] Activated sludge treatment of wastewater was invented by British scientists Clark and Gage in 1912. Specifically, it is a kind of artificially domesticated and cultivated microbial population that grows in a suspended state in an artificially enhanced environment and secretes a substance that can oxidize waste water. Biodegradable organic substances, so as to achieve the purpose of wastewater purification. It can not only remove dissolved or colloidal biochemical organic matter, suspended solids and other toxic and harmful substances that can be adsorbed by activated sludge from wastewater, but also remove some nutrient-rich substances such as phosphorus and nitrogen. At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30G21F9/18
CPCB01J20/20B01J20/24B01J20/28009B01J20/28016G21F9/18
Inventor 彭国文肖方竹符建文石志科余丽梅蒲移秋
Owner NANHUA UNIV
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