Full Length Research Paper
Application of biofilms in
removal of heavy metals from
wastewater in static condition
Dike Henry Ogbuagu*1,
Ikenna Ndubuisi Nwachukwu2and
Bankole Abdulkarim Balogun1
Abstract
This research utilized
biofilms as a model in
ecotoxicology to remove
selected heavy metals (Cd,
Cu, Cr, Zn and Pb) from
wastewater in a static
condition. Biofilms were
grown in three graded
concentrations of the metal
leachates (0.625, 0.417 and
0.250 %), harvested after 1,
2 and 3 weeks and analyzed
for heavy metals. Mean
accumulations peaked on Day
21, and of Cd ranged from
0.000 to 0.040 (mean=0.00837±0.002),
Cu from 0.000 to 0.212
(mean=0.03929±0.012), Cr
from 0.000 to 0.500
(mean=0.05821±0.021), Zn
from 0.000 to 1.456
(mean=0.31833±0.109) and Pb
from 0.000 to 0.099
(mean=0.02129±0.006) mg/g in
resultant biofilm
formations. Accumulation of
the metals increased
significantly with time [F(205.59)>Fcrit(3.95)]
at the 95% confidence
interval. Those of Pb was
significantly higher in the
0.625% leachate mixture than
control (Sig F=0.034) at
P<0.05, even as those of Cd
and Cu were slightly higher
in the concentrations than
control. Biofilm model
removed small amounts of
metals from wastewater
stream in static condition.
Key words: Heavy
metals, biofilms,
bioaccumulation, wastewater,
static condition.
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