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Preparation method of sludge-based charcoal of mixed kitchen waste

A technology of food waste and biochar, which is applied in the direction of pyrolysis treatment of sludge, by-product vaporization, special form of dry distillation, etc., can solve the problems of limited application range and value, large gap, large environmental risks and hazards, etc. Achieve the effects of improving quality and sewage treatment performance, saving preparation costs, and overcoming limitations

Inactive Publication Date: 2017-05-31
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Municipal sludge contains a certain amount of carbon, which can be used as a raw material for preparing biochar. However, because the sludge contains complex components and the carbon content is relatively low, the quality and performance of biochar made from it alone are relatively low. There is a big gap in commercial biochar, and its application range and value are also greatly limited
[0005] Food waste is food leftovers, which contain a large amount of organic components and present great environmental risks and hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Take 50g of municipal sludge and kitchen waste at a ratio of 1:1, stir and mix them into a paste with a moisture content of about 80%, put it in an oven and dry it at 105°C until it reaches a constant weight, remove the sundries and crush it to 4 -8mm.

[0019] (2) Grind with a corundum mortar, pass through a 200-mesh sieve, and collect the undersize.

[0020] (3) Put the undersieve into the atmosphere muffle furnace for high temperature pyrolysis treatment. First pass nitrogen gas at a rate of 200mL / min for 15 minutes, then start heating, increase the temperature at a rate of 10°C / min to 400°C and maintain the temperature for 3 hours, turn off the heating system and let it cool down to 80°C naturally, take out the material and put it in the dryer Cooling to obtain high temperature pyrolysis products.

[0021] (4) After the high-temperature pyrolysis product is cooled to room temperature, soak it with 1M hydrochloric acid for 5 minutes.

[0022] (5) Filter out th...

Embodiment 2

[0027] (1) Take 100g and 50g of municipal sludge and kitchen waste at a ratio of 2:1, mix and stir to form a paste with a moisture content of 80%, put it in an oven and dry it at 105°C until it reaches a constant weight, and then crush it after removing the sundries to 4-8mm.

[0028] (2) Grind with a corundum mortar, pass through a 200-mesh sieve, and collect the undersize.

[0029] (3) Put the undersieve into the atmosphere muffle furnace for high temperature pyrolysis treatment. First pass nitrogen gas at a rate of 150mL / min for 15 minutes, then start heating, increase the temperature at a rate of 15°C / min to 500°C and maintain the temperature for 2.5 hours, turn off the heating system and let it cool down to 80°C naturally, take out the material and put it in the dryer Internal cooling produces high temperature pyrolysis products.

[0030] (4) After cooling the obtained high-temperature pyrolysis product to room temperature, soak it with 1M hydrochloric acid for 5 minute...

Embodiment 3

[0036] (1) Mix 90g and 30g of municipal sludge and kitchen waste in a ratio of 3:1, mix and stir them into a paste with a moisture content of 80%, put it in an oven and dry it at 105°C to constant weight, remove the sundries and crush it to 4-8mm.

[0037] (2) Grind with a corundum mortar, pass through a 200-mesh sieve, and collect the undersize.

[0038] (3) Put the undersieve into the atmosphere muffle furnace for high temperature pyrolysis treatment. First pass nitrogen gas at a rate of 100mL / min for 15 minutes, then start to heat up and heat up to 600°C at a rate of 20°C / min and maintain the temperature for 2 hours, turn off the heating system and let it cool down to 80°C naturally, take out the material and put it in the dryer Cooling to obtain high temperature pyrolysis products.

[0039] (4) After the high-temperature pyrolysis product is cooled to room temperature, soak it with 1M hydrochloric acid for 5 minutes.

[0040] (5) Filter out the hydrochloric acid, soak t...

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PUM

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Abstract

The invention relates to a preparation method of a sludge-based charcoal of mixed kitchen waste. The preparation method includes steps of stirring and mixing the kitchen waste and the municipal sludge to form a paste with about 80% of water content, placing the paste in an oven and drying to the constant weight; breaking the paste to 4-8 mm, and grinding to pass through 200 meshes of sieve. Placing materials in an atmosphere muffle furnace for high-temperature pyrolysis treatment, stopping heating and cooling to 80 DEG C and then discharging; placing in the dryer and cooling to acquire the high-temperature pyrolysis product; immersing the high-temperature pyrolysis product by 1M hydrochloric acid; filtering the hydrochloric acid, and immersing the solid in the de-ionized water for 20 min and then filtering; placing the filtered matter in the oven and drying to constant weight at 105 DEG C; finally acquiring the sludge-based charcoal of the mixed kitchen waste. The preparation method saves preparation cost, changes sludge and kitchen waste to treasure, while greatly improves the quality and sludge treatment performance of the sludge-based charcoal.

Description

technical field [0001] The invention relates to a sludge-based biochar, in particular to a method for preparing the sludge-based biochar by mixing kitchen waste. Background technique [0002] Biochar refers to the material left after biomass is pyrolyzed at high temperature under anoxic conditions. Biochar has a large specific surface area and porous structure, and has good adsorption performance. It can be used as an adsorbent for sewage treatment to adsorb heavy metals, ammonia nitrogen, phosphate, etc. in water. [0003] With the process of urbanization, the construction of urban sewage plants has advanced by leaps and bounds, and the total amount of municipal sludge as a by-product of sewage treatment has also risen sharply. If it is not disposed of properly, it will cause secondary pollution to the environment. The treatment and disposal of sludge has become a serious problem facing the environment today. [0004] Municipal sludge contains a certain amount of carbon, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00C02F11/10
CPCY02W10/40C10B53/00C02F11/10
Inventor 刘常青王玉兰郑育毅刘文伟吴春山王菲凤赵由才李家兵孙启元谢蓉蓉汪清环
Owner FUJIAN NORMAL UNIV