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Study on In-situ Stabilization Remediation of Red Mud Based Granules to Lead-Zinc Contaminated Soil

Author: LiuYan
Tutor: LuoLin; LuoHuiLi
School: Hunan Agricultural University
Course: Environmental Engineering
Keywords: red mud based granules Lead-Zinc Contaminated heavy metal form leek rice
CLC: X53
Type: Master's thesis
Year: 2012
Downloads: 106
Quote: 0
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It is an innovative approach to utilization of red mud for remediation of heavy metal contaminated soil by using red mud-based granules, a modified material of the waste from the Aluminium Industries.The characteristics of red mud granules were studied through the remediation of artificial lead contaminated soil with leeks and rice used in the pot experiments. The effects of various aspects of soil physical and chemical properties, heavy metal form transformation, crop growth inhibition effect and absorption were studied by using different amounts of red mud granules.The effect and mechanism of red mud based granules on stabilization of heavy metals were discussed in this paper.The main results in this experiment showed as follows.(1) Red mud powder and modified granules both increased the soil pH, and the rate increased with the increase of amount. As the remediation materials of heavy metals, the effects of immobilization of ionic Pb were slightly larger by using red mud than granulated red mud in the pre-stage. While in the later stage, efficiency of remediation by granulated red mud was enhanced because of the continual release of alkaline in granulated red mud.(2) The pot experiment showed that the content of Pb in leeks were significantly lower with the increase of the amount of granulated red mud. Immobilization of ionic Pb was significant by red mud granules to the artificial polluted soil which in high level of ionic state. Ion exchangeable lead to more pronounced, the incubation period of10days,5%red mud granules treated ion exchange state lead fell to90.9%, the residual fraction was significantly increased one time. However, the remediation of red mud granules to mine contaminated soil was less than the artificial contaminated soil as the decrease of ion exchangeable lead was only38%.(3) The optimum amount of granulated red mud can not only promote the growth of crops, but also inhibit the absorption of lead. Studies initially identified, the right dosage of granulated red mud in the artificial contaminated soil was3%while1%to3%in mine contaminated soils. Adding excessive amount of granulated red mud although can inhibit the absorption of the lead, but inhibit the growth of crops in the same time.(4) Results of the comparative pot experiments of leeks and rice showed that different influences of the chemical forms occurred with adding granulated red mud in the dry land and paddy fields under the two cultivation methods. The ion exchangeable lead of decline in the pot of leeks was less than the pot of rice in the early stage after adding granulated red mud. In the stage of10days, the ion exchangeable lead decline were18.9%,20.4%,23.3%,27.3%,37.9%respectively with1%to5%addition of granulated red mud in the pot of leeks while22.1%,31.4%,39.4%,46.2%,49.7%respectively in the pot of rice. In the later stage, the ion exchangeable lead remained stable in the pot of leeks while the basic stability after increasing in the pot of rice.(5) Adding phosphates in the granulation of red mud granules to make a new material, signed as PcaGR and PGR.5%PcaGR in the mining area contaminated soil has a dual effect that it could not only sustained release OH-to promote heavy metal chemical forms of transformation and reduce the available of heavy metals (lead, zinc bio-effective state decreased by40.5%,19.3%), but also release phosphorus to promote the uptake of phosphorus by rice and increase production (compared with the blank, rice survival, seed setting rate, yield, respectively, increased by38.87%,9.36%,1.16g/pot).

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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