Preparation method of nitrogen-rich sludge activated carbon doped with food leftover

A technology of sludge activated carbon and leftovers, which is applied in separation methods, chemical instruments and methods, carbon compounds, etc., can solve the problem that the specific surface area of ​​sludge-based activated carbon is not high, the sludge activated carbon is not seen, and the output of sludge activated carbon is not high. It can improve the physical adsorption performance, enhance the chemical adsorption performance, and reduce the processing burden.

Inactive Publication Date: 2018-01-26
SHENZHEN WATER GRP CO LTD +1
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Problems solved by technology

However, further studies have found that sludge activated carbon still has the following disadvantages: (1) The carbon content of sludge itself is not high, so the output of sludge activated carbon is not high; (2) The specific surface area of ​​sludge-based activated carbon is not high , with fewer micropores, there is still a big gap between the performance of desulfurization and denitrification compared with commercial activated carbon
[0006] In view of the above technical problems, there is no method for preparing sludge activated carbon by doping food leftovers. How to solve the above technical difficulties and design a set of feasible and effective production methods so that it can avoid the existing sludge activated carbon Existing shortcoming and deficiency are the problems to be solved in the present invention

Method used

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  • Preparation method of nitrogen-rich sludge activated carbon doped with food leftover
  • Preparation method of nitrogen-rich sludge activated carbon doped with food leftover
  • Preparation method of nitrogen-rich sludge activated carbon doped with food leftover

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preparation example Construction

[0034] likefigure 1 As shown, it is the process flow diagram of the nitrogen-rich sludge activated carbon preparation method of the present invention, and its concrete steps are as follows:

[0035] (1) Air-dry the food scraps and sewage treatment plant sludge, and then grind the dried sludge and food scraps to obtain sludge particles and food scraps particles with a particle size of 30-90 meshes. According to the mass ratio of sludge to food scraps (1~3):1, mixed granules are prepared;

[0036] (2) The mixed particles obtained in step 1 are placed in a fixed bed for pyrolysis, the heating rate is 5 ℃ / min~20 ℃ / min, nitrogen is the protective gas, carbon dioxide is used as the activation gas, and the pyrolysis temperature is 400 ℃~600 ℃ ℃, after staying for 0.5h~2h, the sludge activated carbon mixed with food scraps was prepared;

[0037] (3) Add MDEA to water to prepare 5-20wt% MDEA solution as the dipping solution, immerse the sludge activated carbon prepared in step 2 in th...

Embodiment 1

[0044] (1) Air-dry the food scraps from the canteen and the urban sewage plant sludge for 24 hours, respectively, and then grind the dried sludge and food scraps to obtain sludge particles and food scraps with a particle size of 30 meshes. . According to the mass ratio of sludge and food scraps to be 3:1, mixed granules are prepared.

[0045] (2) the mixed particles obtained in step 1 are placed in a fixed bed for pyrolysis, and the heating rate is 5°C / min. At the beginning, the nitrogen gas with a flow rate of 300mL / min is passed into the protective gas, and the carbon dioxide gas with a flow rate of 300mL / min is passed in. Activated, the pyrolysis temperature was 500 °C, and the sludge activated carbon mixed with food scraps was obtained after staying for 0.5 h.

[0046] (3) MDEA was mixed into deionized water to make 5wt% MDEA solution as immersion solution, then the sludge activated carbon obtained in step 2 was immersed in the above dipping solution, placed in a magnetic...

Embodiment 2

[0049] (1) Air-dry the food scraps from the canteen and the municipal sewage plant for 24 hours, respectively, and then grind the dried sludge and food scraps to obtain sludge particles and food scraps with a particle size of 60 meshes. . According to the mass ratio of sludge and food scraps to be 2:1, mixed granules are prepared.

[0050] (2) the mixed particles obtained in step 1 are placed in a fixed bed for pyrolysis, and the heating rate is 20° C. / min. At the beginning, the nitrogen gas with a flow rate of 400mL / min is introduced as a protective gas, and the carbon dioxide gas with a flow rate of 400mL / min is introduced. Activated, the pyrolysis temperature was 400 °C, and the sludge activated carbon mixed with food scraps was obtained by staying for 2 hours.

[0051] (3) MDEA was mixed into deionized water to make 20wt% MDEA solution as immersion solution, then the sludge activated carbon obtained in step 2 was immersed in the above dipping solution, placed in a magneti...

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Abstract

Belonging to the field of sludge treatment, the invention particularly relates to a preparation method of nitrogen-rich sludge activated carbon doped with food leftover. The method specifically includes the steps of: S1 subjecting sludge and food leftover to air drying respectively and performing milling, and mixing the sludge granules and food leftover granules obtained by milling evenly; S2 subjecting the prepared mixed particles to pyrolysis activation reaction to obtain sludge activated carbon doped with food leftover; S3 impregnating the sludge activated carbon in an MDEA impregnation solution, and stirring the substances fully; and S4 fully drying the sludge activated carbon to obtain the nitrogen-rich sludge activated carbon. The preparation method provided by the invention can improve the carbon content and nitrogen content of activated carbon, and generates sludge activated carbon with high porosity and good adsorption properties, also the whole process does not cause secondary pollution to the environment, and has the advantages of high efficiency, high quality, low cost, no toxicity, convenient control and the like, thereby being especially suitable for mass production application occasions.

Description

technical field [0001] The invention belongs to the field of sludge treatment, and more particularly, relates to a preparation method of nitrogen-rich sludge activated carbon mixed with food scraps. Background technique [0002] At present, my country's sludge treatment is mainly based on landfill and land utilization, and other utilization methods are supplemented. develop. On April 16, 2015, the State Council issued the Action Plan for the Prevention and Control of Water Pollution. The plan pointed out that the construction and renovation of urban sewage treatment facilities and the promotion of sludge treatment and disposal should be accelerated, and the existing sludge treatment and disposal facilities should be basically completed by the end of 2017. Reconstruction that meets the standards, the harmless treatment and disposal rate of sludge in cities at the prefecture level and above should reach more than 90% by the end of 2020. In recent years, my country's sewage tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/336C01B32/372B01D53/02B01D53/60B01D53/81
Inventor 邵敬爱黄河洵张俊杰安瑞王贤华王越兴陈汉平金前争
Owner SHENZHEN WATER GRP CO LTD
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