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Method for manufacturing magnetic sludge-based active carbon

A technology of activated carbon and sludge, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of difficult recycling of activated carbon, increase in cost, environmental pollution, etc., and achieve easy separation from water. , The effect of reducing production costs and reducing environmental pollution

Inactive Publication Date: 2013-11-27
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to strictly implement the requirements and development trends of the Twelfth Five-Year Plan for resource utilization and sustainable development. Magnetic sludge-based activated carbon solves the problem that activated carbon is difficult to recycle; the production process of magnetic sludge-based activated carbon overcomes the binder , cost increase caused by the use of surfactants, environmental pollution and high energy consumption

Method used

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  • Method for manufacturing magnetic sludge-based active carbon
  • Method for manufacturing magnetic sludge-based active carbon
  • Method for manufacturing magnetic sludge-based active carbon

Examples

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Embodiment 1

[0029] A method for preparing sludge-based magnetic activated carbon, the method uses residual sludge from urban sewage treatment plants as the main raw material, and is characterized in that it includes the following processes:

[0030] (1) The remaining sludge from the urban sewage plant was dried in a drying oven at 105° C. (24 hours), and then pulverized with a pulverizer until it passed through a 200-mesh sieve to obtain sludge powder.

[0031] (2) Soak the sludge powder in a mixed solution of ferrous chloride and ferric chloride for 24 hours for activation, then add ammonia water under rapid stirring, and put it in a drying oven at 105°C for drying (48h).

[0032] (3) Put the treated sludge in (2) into the muffle furnace and heat it up to the optimum temperature for carbonization for 45 minutes, activate for 60 minutes at the optimum temperature for activation, and then cool to room temperature

[0033] (4) The material after (3) is cleaned with distilled water, dried, g...

Embodiment 2

[0037] The difference between this embodiment and Example 1 is that step (5) is: perform characterization analysis on the magnetic activated carbon produced in (4), including specific surface area analysis, magnetic force analysis, XRD phase analysis, load magnetic ratio, other steps and implementation Example 1 is the same.

[0038] After testing, the BET specific surface area of ​​magnetic sludge-based activated carbon is 178.0m 2 / g, the external area is 57.77m 2 / g, the surface area of ​​micropores is 120.2m 2 / g; the coercive force is 131.9G, the magnetization is 2.6089emu / g, and the magnetic force is 0.28075emu / g. The phases that can be determined by XRD include graphite, ferric oxide, hematite, iron, iron tartrate, etc. , the mass ratio of the produced sludge-based magnetic activated carbon containing magnetism to the total solid matter is 84.6%.

Embodiment 3

[0040] The difference between this embodiment and embodiment one is that the (5) step is: adding 25 mg / l of magnetic activated carbon and 1.5 mg / l of ozone in the water whose ibuprofen concentration is 700 ug / l, and adding the hydroxyl radical inhibitor simultaneously Tertiary butanol, 0.25mmol / l, other steps are identical with embodiment one.

[0041] After testing, the intervention of tert-butanol largely inhibited the removal effect of magnetic sludge-based activated carbon on ibuprofen, which indicated that magnetic sludge-based activated carbon catalyzed ozone oxidation of ibuprofen followed the mechanism of hydroxyl radical reaction.

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Abstract

The invention discloses a method for manufacturing magnetic sludge-based active carbon by taking redundant sludge in an urban sewage treatment plant as main raw materials and aims to solve the problem that existing active carbon catalysts are difficult to be recycled. The method comprises the steps of immersing the dried redundant sludge in a ferric chloride and ferrous chloride mixing solution activation agent for activating for 24 hours, dripping ammonia water, putting the mixture into a drying box with the temperature of 105 DEG C for drying, carbonizing and activating the mixture in a muffle furnace, cleaning the mixture with distilled water, grinding and screening products, and performing magnetic separation to obtain the magnetic sludge-based active carbon. The magnetic sludge-based active carbon manufactured by the method is very convenient to separate and recycle and is extremely high in catalytic oxidation capacity and heavy metal adsorption capacity.

Description

Technical field [0001] The invention relates to a method for preparing magnetic activated carbon from surplus sludge of urban sewage treatment plants, in particular to a method for directly loading magnetism in the activated carbon production process. Background technique [0002] At present, the production of magnetic activated carbon is mostly made of finished activated carbon, and most of the finished activated carbon is charcoal and coal. Due to the slow regeneration of wood and the large consumption of wood, the development of wood activated carbon is limited. However, the production cost of coal-based activated carbon continues to increase due to the reduction of coal resources. Therefore, looking for other resources to replace traditional raw materials such as wood and coal to prepare activated carbon has become a hot spot of concern. Using the surplus sludge of urban sewage treatment plants as raw material to produce activated carbon can not only find a way out for...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F11/00C02F1/28
Inventor 张立秋王雪封莉
Owner BEIJING FORESTRY UNIVERSITY
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