IMMOBILIZATION AND REDUCTION OF LEAD (II) CONCENTRATION IN HIGHLY CONTAMINATED SOIL APPLIED WITH PEANUT HULL BIOCHAR

Yıl 2018, Cilt: 2 Sayı: 1, 44 - 51, 15.06.2018

Jessie Sabıjon Derby Polıquıt

Öz

Biochar
produced from waste biomass is increasingly being recognized as a green,
cost-effective amendment for environmental remediation. The study was conducted
to determine the effectiveness of biochar in immobilizing and reducing
concentration of heavy metal particularly Lead (Pb) in contaminated soil.
Biochar prepared from peanut hull was incubated with contaminated soils at
rates of 0, 2.5, 5.0 and 10g kg^-1 soil by weight for 55 days.
Sub-sampling also was done at 25, 40, 50 and 55 days after incubation to
determine the Pb reduction effect of biochar with time. Lead concentration was
thoroughly quantified by following the aqua-regia leaching method at Soil
Pedological Laboratory, Department of Agronomy and Soil Science, Visayas State
University, Visca, Baybay City, Leyte. Results revealed that biochar was
significantly increases the phosphorus content of the soil which enhances its
effectiveness in immobilizing and reducing Pb concentration. Moreover, the
effectiveness was enhanced with increasing incubation time from day 0 to day 55
and biochar rates (0 g to 10 g kg^-1 soil). However, no significant
differences in the pH and organic matter content of the soil were observed
after addition of peanut hull biochar. After 55 days of incubation, soils
treated with the highest rate of 10g kg^-1 soil biochar showed the
highest reduction in Pb concentrations in aqua - regia leaching method. This is
due to the high phosphorus originally contained in biochar reacted with soil Pb
to form insoluble hydroxypyromorphite Pb₅(PO₄)₃(OH)
which was presumably responsible for soil Pb immobilization. The results
highlighted the potential of peanut hull biochar as one of the unique amendment
for immobilization of heavy metal particularly lead in contaminated soil. 

Anahtar Kelimeler

Peanut hull biochar, lead immobilization

Kaynakça

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