Removal And Biodegradation Of
Polycyclic Aromatic Hydrocarbons By
Immobilized Microalgal Beads
Author(s)
N. F. Y. Tam, M. N. Chan & Y. S. Wong
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are a class of toxic, carcinogenic
and/or mutagenic organic compounds, which must be removed from
contaminated environments such as wastewater. The present study aims to
explore the potential of a fresh water green microalga, Selenastrum
capricornutum, immobilized in alginate beads to remove mixed PAHs and
determine the optimal density for an effective removal. Results demonstrated
that the immobilized microalgal beads were effective in removing and
biodegrading mixed PAHs at their dissolved concentrations, namely
phenanthrene (PHE, 1 mg l-1), fluoranthene (FLA, 0.25 mg l-1) and pyrene (PYR,
0.1 mg l-1). These abilities were significantly affected by cell density, ranging
from 2.5x105 to 5x106 cells bead-1. At the optimal cell density of 2.5x106 cells
bead-1, 92% PHE and all FLA were removed in 168 hours, and it only took 24
hours to completely remove PYR. In 168-hour treatment, 73% PHE was
biodegraded while FLA and PYR were completely degraded. The removal and
biodegradation of PAHs were further enhanced by increasing the number of
beads used and the optimal bead density was 20 beads ml-1 wastewater. These
findings suggested that PAHs were quickly adsorbed onto cells and the alginate
matrix, absorbed within cells and further degraded by live cells immobilized in
alginate beads.
Keywords: algae, alginate, persistent organic pollutant, PAHs, Selenastrum,
wastewater treatment.
Keywords
algae, alginate, persistent organic pollutant, PAHs, Selenastrum,
wastewater treatment
Related Book
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