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A method for stabilizing and remediating heavy metal-contaminated soil using sludge-based carbon ash
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A technology for polluting soil and heavy metals, applied in the restoration of polluted soil, etc., to achieve significant passivation effect, long-term effect, strong universality, and the effect of reducing energy consumption
Active Publication Date: 2021-04-06
ZHEJIANG UNIV OF TECH
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[0005] Aiming at the technical bottleneck of biochar passivation repairing heavy metal-contaminated soil, the present invention proposes to use biomass incineration ash to replace the ash in high-temperature biochar, so as to ensure the alkaline environment required for the restoration process and realize the resource utilization of ash; through A small amount of phosphate rock powder was introduced into the ball mill to increase the specific surface area of the repair material and solve the stability and long-term effects of heavy metal passivation; and then constructed a new method based on the stabilization of biomass heat treatment (by-)products to repair heavy metal contaminated soil. method
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Embodiment 1
[0032] A. Preparation of sludge-based carbon ash remediation materials
[0033] The dewatered sludge is taken from a domestic sewage plant in central China, and the sewage treatment process of this plant is A 2 O, the moisture content of the dewatered sludge is 60%. The dewatered sludge was blown and dried at 105°C, and after cooling, it was crushed through a 10-mesh standard sieve to obtain sludge granules.
[0034] Part of the sludge particles were pyrolyzed in an oxygen-limited environment at 300°C for 3 hours, and the solid carbonization product was collected after cooling, which was low-temperature sludge-based biochar.
[0035] Incinerate another part of the sludge particles in an oxygen-enriched environment at 850°C for 3 hours, and collect the solid ash remaining on the grate after cooling, which is the sludge incineration ash.
[0036] Industrial-grade phosphate rock powder was purchased from a chemical company in Shandong. The main component is fluoro-apatite, cont...
Embodiment 2
[0041] A. Preparation of sludge-based carbon ash remediation materials
[0042] The dewatered sludge is taken from an urban domestic sewage plant in East China, and the sewage treatment process of this plant is A 2 O, the moisture content of the dewatered sludge is 62%. The dewatered sludge was blown and dried at 110°C, and after cooling, it was crushed through a 10-mesh standard sieve to obtain sludge granules.
[0043] Part of the sludge particles were pyrolyzed in an oxygen-limited environment at 350°C for 2 hours, and the solid carbonization product was collected after cooling, which was low-temperature sludge-based biochar.
[0044] The other part of the sludge particles was incinerated in an oxygen-enriched environment at 900°C for 2 hours, and after cooling, the solid ash remaining on the grate was collected, which was the sludge incineration ash.
[0045] Industrial-grade phosphate rock powder was purchased from a chemical company in Shandong. The main component is f...
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Abstract
The invention discloses a method for stabilizing and repairing heavy metal-contaminated soil by using sludge-based charcoal ash. The dewatered sludge from a sewage plant is pyrolyzed in an oxygen-limited environment and incinerated in an oxygen-enriched environment to obtain low-temperature sludge-based biochar and Sludge incineration ash is mixed with strengthening agent and ball milled to obtain sludge-based charcoal ash restoration material. The sludge-based charcoal ash restoration material is added to heavy metal-contaminated soil, mixed with water, and then aged and cured to complete the restoration. The technical method of the present invention is simple and practical, the source of raw materials is wide, the price is low, the process is green and energy-saving, the universality is strong, the passivation effect is remarkable and long-lasting, the construction link does not have high requirements on the equipment, it is conducive to large-scale promotion, and has obvious advantages. economic, social and environmental benefits.
Description
technical field [0001] The invention relates to a method for stabilizing and repairing heavy metal polluted soil by using sludge-based charcoal ash, and belongs to the technical field of soil improvement and repair. Background technique [0002] The situation of soil heavy metal pollution in my country is severe, and the prevention, control and restoration of soil heavy metal pollution has become a major practical demand of the country. The methods of remediating heavy metals in soil include: 1) reducing their toxicity, bioavailability, and migration and transformation ability by changing the occurrence state or combination of heavy metals in soil, thereby reducing their ecological and health risks (up to an acceptable level); 2 ) Realize its risk management and control by cutting off or blocking its exposure pathways or methods with receptors; 3) Remove heavy metals from the soil through various technical means or methods, so as to complete the restoration and purification ...
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