Poster Presentation 1B-32
Immobilized Biological Filter for Advanced Drinking Water Treatment
F. Ma,1 S.N. Sin,1* H. Chua,2 H.Y. Yang1
and H.Y. Wang1
1School of municipal and environmental Engineering
Harbin institute of technology
2Joint
Research Centre for Water and Wastewater Treatment Technology
Department of Civil and Structural Engineering
Hung Hom,
Metal-removing
bacteria were isolated,
studied and inoculated in an immobilized biological activated carbon (IBAC)
system for advanced drinking water treatment. Bacteria separated from matured filter
bed of groundwater treatment plant were incubated in a culture
medium
containing iron and
manganese. A consortium of 5 strains of bacteria that were effective in removing iron and manganese were isolated by repeatedly enrichment
culturing. It was observed
that these bacteria grew better in the media containing both Fe and Mn
than in that
containing only Fe. No growth and biological activity were
observed in the culture media containing only Mn. Growth rates were indifferent of dissolved oxygen
levels. An
IBAC system inoculated with this bacterial consortium, together
with other organic-removing bacteria, simultaneously and
effectively removed Fe, Mn and permanganate with removal efficiencies of 98, 96 and 55%, respectively. Furthermore, with an operational hydraulic
retention time of 30 minutes, the influent water with turbidity of 1.5 NTU, color of
25 degree and offensive odor was treated
to a quality with
turbidity of less than 0.5 NTU, color
of less than 15 degree and odorless. The
sequential effects of activated carbon adsorption and microbial uptake achieved advanced drinking water
treatment.