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Method for preparing carbon sequestration biochar by using mixed sludge

A technology of mixing sludge and biochar, applied in sludge treatment, pyrolysis sludge treatment, chemical instruments and methods, etc. question

Inactive Publication Date: 2020-08-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synergistic treatment of these two sludges, on the one hand, solves the problem of large pyrolysis carbon loss and low biochar carbon content in municipal sludge;

Method used

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  • Method for preparing carbon sequestration biochar by using mixed sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Dry and dehydrate municipal sludge biochar. Weigh a certain amount of dry sludge and put it in a pulverizer until it is crushed into powder.

[0013] (2) Put the sludge powder in the step (1) into the defense crucible, then place it in the muffle furnace, feed nitrogen at a rate of 220ml / min, run the muffle furnace after the air in the muffle furnace is exhausted, and set the temperature to rise The rate is 10°C / min, take the room temperature as 20°C, raise the temperature for 8.5 minutes to reach t1=105°C, maintain for 3 hours, reach t2=105°C, then raise the temperature for 49.5 minutes, reach the set temperature t3=600°C, and maintain for 4 hours.

[0014] (3) After the pyrolysis is completed, put it in a desiccator to cool naturally, and pass through a 50-mesh sieve to obtain mixed sludge biochar.

Embodiment 2

[0016] (1) Dry and dehydrate the municipal sludge and pharmaceutical factory sludge separately. According to the mass ratio of 1:1, take the municipal sludge and the pharmaceutical factory sludge and put them in the pulverizer, and grind them into powder.

[0017] (2) Put the powdery mixed sludge in the crucible, then place it in the muffle furnace, feed nitrogen gas at a rate of 220ml / min, run the muffle furnace after the air in the muffle furnace is exhausted, and set the heating rate to 10°C / min, take the room temperature as 20°C, raise the temperature for 8.5min to t1=105°C, maintain for 3h, reach t2=105°C, then raise the temperature for 49.5min, reach the set temperature t3=600°C, and maintain for 4h.

[0018] (3) After the pyrolysis is completed, put it in a desiccator to cool naturally, and pass through a 50-mesh sieve to obtain mixed sludge biochar.

Embodiment 3

[0020] (1) Dry and dehydrate the municipal sludge and pharmaceutical factory sludge separately. According to the mass ratio of 2:1, the municipal sludge and pharmaceutical factory sludge are put into a pulverizer and ground into powder.

[0021] (2) Put the powdery mixed sludge in the crucible, then place it in the muffle furnace, feed nitrogen gas at a rate of 220ml / min, run the muffle furnace after the air in the muffle furnace is exhausted, and set the heating rate to 10°C / min, take the room temperature as 20°C, raise the temperature for 8.5min to t1=105°C, maintain for 3h, reach t2=105°C, then raise the temperature for 49.5min, reach the set temperature t3=600°C, and maintain for 4h.

[0022] (3) After the pyrolysis is completed, put it in a desiccator to cool naturally, and pass through a 50-mesh sieve to obtain mixed sludge biochar.

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Abstract

The invention discloses a method for preparing carbon sequestration biochar by using mixed sludge. According to the method, the sludge of a pharmaceutical factory and municipal sludge are mixed and ground, and the biochar is prepared at a certain pyrolysis rate, so comprehensive utilization of inorganic nutrient elements of the two kinds of sludge is achieved, the carbon content of a single kind of sludge biochar is increased, and a good carbon sequestration effect is found according to verification via an aging experiment. The preparation method comprises the following steps: naturally airingthe sludge; grinding the sludge until a particle size is 5 mm, putting the sludge into a muffle furnace, introducing nitrogen at a speed of 200 ml / min, operating the muffle furnace after air in the furnace is emptied in 1 hour, regulating the temperature of the muffle furnace to a target temperature, setting a heating rate to be 10 DEG C*min <-1 >, and keeping the temperature for 4 hours after the target temperature is reached so as to allow the biomass to be fully pyrolyzed. The method is simple in process and low in cost, the obtained pharmaceutical factory sludge-municipal sludge biochar has more nutrient elements and stable chemical properties, the carbon stability of the obtained biochar is higher than the carbon stability of single sludge biochar, and the method has good applicationprospects in the aspects of soil improvement, environmental remediation and waste resource utilization.

Description

technical field [0001] The invention belongs to the technical field of biochar, and in particular relates to a method for preparing carbon-fixing biochar by using mixed sludge. Background technique [0002] The application potential of biochar in soil carbon sequestration makes it one of the ways to reduce greenhouse gas emissions and solve the problem of global climate change. At present, most studies use traditional biomass such as rice straw to prepare biochar. Although the physical and chemical properties and carbon sequestration effect of the prepared biochar are good, the cost of biomass source is relatively high. The moisture content of sludge is high, and the moisture content of preliminary dewatered sludge is as high as 80%. How to deal with a large amount of sludge has become an environmental problem that needs to be solved urgently. Sludge itself has a high content of organic matter, and the use of sludge pyrolysis to prepare biochar is a way of resource utilizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/13C02F11/10B01J20/20B01J20/30
CPCC02F11/00C02F11/13C02F11/10B01J20/20B01J20/3078B01J2220/4887
Inventor 左宁
Owner KUNMING UNIV OF SCI & TECH
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