Method for preparing biochar and solidifying heavy metals through coupling sludge with biomass pyrolysis

A biomass pyrolysis and biochar technology, which is applied to chemical instruments and methods, water pollutants, sludge treatment, etc., can solve the problems of poor sludge charcoal quality, unsatisfactory heavy metal solidification effect, etc., achieve low ash content, reduce Effects of heavy metal pollution and high oil yield

Active Publication Date: 2021-06-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the quality of the sludge charcoal obtained by the existing technology is poor, and the solidification effect of heavy metals is not ideal

Method used

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  • Method for preparing biochar and solidifying heavy metals through coupling sludge with biomass pyrolysis
  • Method for preparing biochar and solidifying heavy metals through coupling sludge with biomass pyrolysis
  • Method for preparing biochar and solidifying heavy metals through coupling sludge with biomass pyrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The rice rod is selected as a biomass sample, and the rice rod is dried in an oven at 105 ° C for 10 hours before mixing with industrial sludge, wherein the rice rod is broken and sieved from 0.15-0.35 mm particle diameter;

[0036] Dehydration treatment of industrial sludge is reduced from 80% to less than 60%, and rice is mixed with sludge with sludge in mass mixing ratios 1: 1, and mixed heavy metal sludge and biomass mixture The mixture was stirred with a mixer for 4 h and allowed to stand at room temperature for 8 hours;

[0037] The retained heavy industrial sludge with the biomass mixture was dried in an electric blast drying tank at 105 ° C for 24 hours to obtain a sludge-biomass mixture;

[0038] The dry sludge-biomass mixed feed is added to the quartz boat. The pyrolysis is added to the fixed bed tube furnace reactor. It is introduced into nitrogen as a protective atmosphere, and the temperature rise rate is 10 ° C / min, and the temperature is increased to 500 ° ...

Embodiment 2

[0044] The rice rod is selected as a biomass sample, and the rice rod is dried in an oven at 105 ° C for 10 hours before mixing with industrial sludge, wherein the rice rod is broken and sieved from 0.15-0.35 mm particle diameter;

[0045] Dehydration treatment of industrial sludge is reduced from 80% to less than 50%, mixed with sludge with sludge in mass mixing ratios 1: 0.5, mixed heavy metal sludge and biomass mixture The mixture was stirred with a mixer for 2 h and allowed to stand at room temperature for 5 hours;

[0046] The retained heavy industrial sludge with the biomass mixture was dried in an electric blast drying tank at 105 ° C for 24 hours to obtain a sludge-biomass mixture;

[0047] The dry sludge-biomass mixed feed is added to the quartz boo bots in the fixed bed tube furnace reactor, and the nitrogen is introduced as the protective atmosphere, the temperature rise rate is 15 ° C / min, and the temperature is increased to 600 ° C, After holding up 60 min, the hot ...

Embodiment 3

[0049] The rice rod is selected as a biomass sample, and the rice rod is dried in an oven at 105 ° C for 10 hours before mixing with industrial sludge, wherein the rice rod is broken and sieved from 0.15-0.35 mm particle diameter;

[0050] Dehydration treatment of industrial sludge is reduced from 80% to less than 65%, and the rice rod and sludge of mass mixing ratio 1: 2 are mixed, and mixed heavy metal sludge and biomass mixture The mixture was stirred with a mixer for 5 h and allowed for 10 hours at room temperature;

[0051] The retained heavy industrial sludge with the biomass mixture was dried in an electric blast drying tank at 105 ° C for 24 hours to obtain a sludge-biomass mixture;

[0052] The dry sludge-biomass mixed material is packed in quartz boat furnace reactor, and nitrogen is introduced into the protective atmosphere, and the temperature rise rate is 20 ° C / min, and then the temperature is increased to 700 ° C, After holding up 60 min, the hot solution is obtai...

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Abstract

The invention discloses a method for preparing biochar and solidifying heavy metals by coupling sludge with biomass pyrolysis, which comprises the following steps: 1) pretreating biomass, and mechanically dehydrating sludge; 2) fully and uniformly mixing the treated biomass and sludge, adding into a stirrer, stirring and standing to obtain a mixture; step 3) adding the mixture into a drying furnace for dewatering and drying to obtain a dried sludge-biomass mixture; and 4) adding the sludge-biomass mixture into a pyrolyzing furnace, pyrolyzing in an anaerobic or anoxic environment, and cooling solid residues after the pyrolysis is completed to obtain the biochar. According to the method for preparing the biochar and solidifying the heavy metal through sludge coupling biomass pyrolysis, the biochar can be prepared through sludge pyrolysis efficiently, meanwhile, the heavy metal in the biochar is solidified, and heavy metal pollution is greatly reduced.

Description

Technical field [0001] The present invention belongs to the field of sludge treatment. Background technique [0002] In recent years, with my country's industrialization process has accelerated, the output of my country's sludge is gradually improved. Sludge contains a large number of pathogenic microorganisms, heavy metals, pathogenic bacteria, parasitic eggs, etc., if not properly handled, it is directly dumped into the environment, will release pollutants in soil and water, extreme It is easy to form a serious secondary pollution in terms of groundwater and soil. At the same time, the sludge contains a large number of nitrogen (N), phosphorus (P), potassium (K) and organic matter such as nitrogen value and organic matter, and has a certain heat value. If the processing is used, it can greatly reduce the volume of industrial sludge, and turn it into treasure, which can solve environmental pollution problems, and achieve resource recycling and enhance economic benefits. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/10C10B55/02B01J20/30B01J20/20C02F101/20
CPCC02F11/008C02F11/10C10B55/02B01J20/20C02F2101/20Y02W10/40
Inventor 张会岩彭勃肖睿储升
Owner SOUTHEAST UNIV
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