Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Environmental Performance of Lime–Rice Husk Ash Stabilized Lateritic Soil Contaminated with Lead or Naphthalene
Abstract This study evaluates the environmental performance of a lime–rice husk ash stabilized lateritic soil that had been contaminated with either lead or naphthalene. The Lime and Rice husk ash mixed in a ratio of 1:2 was used as a stabilizing binder and added to the contaminated soil at diverse quantities of 5 and 10% by weight of the contaminated samples. Environmental performance of the soil-contaminant-binder mixes were evaluated from the leaching and batch equilibrium adsorption tests conducted on the samples. Mineralogical analysis was also carried out on the leached samples using the X-ray diffractometer to determine the predominant minerals. The leaching test revealed that the lead concentration in the leachate was reduced below the allowable standard limit of 5 mg/l for lead, even after a duration of disturbed shaking at pH 3 ± 0.5 as the binder addition was increased from 0 to 5 to 10%. The binder addition was not effective to reduce the leachate concentrations of the naphthalene contaminant below the allowable standard limit for naphthalene in soil which is 0.2 µg/l. The batch equilibrium adsorption test showed that lateritic soil had a good adsorption capacity for both contaminants, which increased with an increase in the binder addition.
Environmental Performance of Lime–Rice Husk Ash Stabilized Lateritic Soil Contaminated with Lead or Naphthalene
Abstract This study evaluates the environmental performance of a lime–rice husk ash stabilized lateritic soil that had been contaminated with either lead or naphthalene. The Lime and Rice husk ash mixed in a ratio of 1:2 was used as a stabilizing binder and added to the contaminated soil at diverse quantities of 5 and 10% by weight of the contaminated samples. Environmental performance of the soil-contaminant-binder mixes were evaluated from the leaching and batch equilibrium adsorption tests conducted on the samples. Mineralogical analysis was also carried out on the leached samples using the X-ray diffractometer to determine the predominant minerals. The leaching test revealed that the lead concentration in the leachate was reduced below the allowable standard limit of 5 mg/l for lead, even after a duration of disturbed shaking at pH 3 ± 0.5 as the binder addition was increased from 0 to 5 to 10%. The binder addition was not effective to reduce the leachate concentrations of the naphthalene contaminant below the allowable standard limit for naphthalene in soil which is 0.2 µg/l. The batch equilibrium adsorption test showed that lateritic soil had a good adsorption capacity for both contaminants, which increased with an increase in the binder addition.
Environmental Performance of Lime–Rice Husk Ash Stabilized Lateritic Soil Contaminated with Lead or Naphthalene
Oluwatuyi, Opeyemi E. (Autor:in) / Ojuri, Oluwapelumi O. (Autor:in)
2017
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
57.00$jBergbau: Allgemeines
/
38.58
Geomechanik
/
57.00
Bergbau: Allgemeines
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
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