Sludge charcoal for repairing heavy metal contaminated soil and preparation method of sludge charcoal

A technology of polluting soil and biochar, applied in biofuels, soil conditioning materials, chemical instruments and methods, etc., can solve secondary pollution and other problems, and achieve the effects of economic feasibility, stress reduction, and wide-ranging sources

Inactive Publication Date: 2016-10-12
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention can solve the problem of secondary pollution caused by the existing sludge treatment and disposal method, make the sludge re-enter the material and energy cycle of the natural environment, and can solve th...

Method used

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  • Sludge charcoal for repairing heavy metal contaminated soil and preparation method of sludge charcoal
  • Sludge charcoal for repairing heavy metal contaminated soil and preparation method of sludge charcoal
  • Sludge charcoal for repairing heavy metal contaminated soil and preparation method of sludge charcoal

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preparation example Construction

[0037] A method for preparing sludge biochar for remediation of heavy metal contaminated soil, characterized in that it comprises the following steps:

[0038] A. Biological and physical drying

[0039] The concentrated sludge is dried biologically and physically, and the concentrated sludge is piled up for aerobic fermentation. During the stacking process, it is ventilated and dried. According to the weight of the concentrated sludge, the ventilation intensity is 120-180 L·( h·kg) -1 , ventilation and drying for 120 hours, and the water content of the concentrated sludge after biological and physical drying is controlled at 52-60%;

[0040] B. Drying and granulation again

[0041] The dried concentrated sludge in step A is crushed, the crushed particle size is ≤5mm, and the weight ratio of palygorskite is 5-10%, and the rest is concentrated sludge. Dry and granulate in a converter at ℃ for 8 hours to obtain granules with a particle size of 1-3mm;

[0042] C. Pyrolysis and ...

Embodiment 1

[0049] A method for preparing sludge biochar for remediation of heavy metal contaminated soil, comprising the steps of:

[0050] A. Biological and physical drying

[0051] The concentrated sludge is dried biologically and physically, and the concentrated sludge is piled up for aerobic fermentation. During the stacking process, it is ventilated and dried. According to the weight of the concentrated sludge, the ventilation intensity is 120L (h kg) -1 , ventilation and drying for 120 hours, and the water content of the concentrated sludge after biological and physical drying is controlled at 52-60%;

[0052] B. Drying and granulation again

[0053] The dried and concentrated sludge in step A is crushed, the crushed particle size is ≤5 mm, and the weight ratio of palygorskite is 5% and the concentrated sludge is 95%. The mixture is fully mixed and stirred evenly, and the mixed material is heated at 80-120°C Dry and granulate in a converter for 8 hours to obtain granules with a p...

Embodiment 2

[0059] A method for preparing sludge biochar for remediation of heavy metal contaminated soil, comprising the steps of:

[0060] A. Biological and physical drying

[0061] The concentrated sludge is dried biologically and physically, and the concentrated sludge is piled up for aerobic fermentation. During the stacking process, it is ventilated and dried. According to the weight of the concentrated sludge, the ventilation intensity is 180 L·( h·kg) -1 , ventilation and drying for 120 hours, and the water content of the concentrated sludge after biological and physical drying is controlled at 52-60%;

[0062] B. Drying and granulation again

[0063] The dried concentrated sludge in step A is crushed, the crushed particle size is ≤5mm, and the weight ratio of palygorskite is 8% and the concentrated sludge is 92%. The mixture is fully mixed and stirred, and the mixed material is heated at 80-120°C. Dry and granulate in a converter for 8 hours to obtain granules with a particle s...

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Abstract

The invention belongs to the technical field of in-situ repair of heavy metal contaminated soil. Municipal sludge is used for preparing sludge-based charcoal through thermophilic thermolysis. The charcoal can be used as a repairing agent for the heavy metal contaminated soil. The sludge charcoal repairing agent comprises thickened sludge and palygorskite. A final black product namely the sludge-based charcoal is produced through the steps of performing biological and physical anhydration on sludge, then mixing the sludge after the biological and physical anhydration with the palygorskite, performing feeding into an atmosphere furnace, and then performing thermophilic thermolysis. The sludge charcoal is produced from the following components of 5-10% of the palygorskite and the balance of thethickened sludge. According to the sludge charcoal disclosed by the invention, the municipal sludge is subjected to decrement and harmless treatment, so that the municipal sludge can enter cycle of material and energy in natural environment again, and the difficult problem of treating and disposing the sludge is solved. The sludge charcoal is added to the heavy metal contaminated soil, so that heavy metal contaminated substances can be effectively solidified, the purposes of being durable and stable in repairing effect and being free from secondary pollution are realized, and the sludge charcoal is an ideal soil heavy metal contamination repairing agent with low cost.

Description

technical field [0001] The invention belongs to the technical field of in-situ remediation of heavy metal-contaminated soil, and uses municipal sludge to prepare sludge-based biochar, which can be used as a remediation agent for heavy metal-contaminated soil. Background technique [0002] The Ministry of Environmental Protection and the Ministry of Land and Resources jointly issued the "National Soil Pollution Survey Bulletin" on April 17, 2014. The bulletin shows that the national soil environment is worrying, and the soil pollution is serious in some areas. Soil environmental problems are prominent. The total exceeding rate of soil in the country is 16.1%, mainly of inorganic models, and the number of points exceeding the standard of inorganic pollutants accounts for 82.8% of all points exceeding the standard. Inorganic pollutants are mainly 8 heavy metals including cadmium, mercury, arsenic, copper, lead, chromium, zinc and nickel, with slight and mild pollution being the...

Claims

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Application Information

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IPC IPC(8): C09K17/04C10B53/02
CPCC09K17/04C10B53/02Y02E50/10
Inventor 戴亮宋小三陈琛李宜义崔伟
Owner LANZHOU JIAOTONG UNIV
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