Activity of Nitrifying Biofilms Constructed on Low-Density Polyester Enhances Bioremediation of a Coastal Wastewater Effluent |
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Authors: | J Paniagua-Michel Alejandro Franco-Rivera J Jason L Cantera Lisa Y Stein |
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Institution: | (1) Department of Marine Biotechnology, Centro de Investigacion Cientifica y de Educacion Superior de Ensenada, Km 107 Carretera Tijuana-Ensenada, Ensenada, BC, Mexico;(2) Department of Environmental Sciences, University of California at Riverside, Riverside, CA, USA |
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Abstract: | Summary Nitrifying biofilms were constructed on low density polyester Dacron for the bioremediation of nitrogen from wastewater effluent
of a municipal treatment plant. Dacron disks were inoculated with wastewater sludge enriched for 15 days for either ammonia-
or nitrite-oxidizing bacteria (AOB or NOB, respectively) and packed into glass bioreactors. Wastewater effluent containing
high levels of ammonia, nitrite, and phosphate was collected and fed to inoculated and uninoculated bioreactors. Both inoculated
bioreactors showed stable nitrification efficiencies, removing 96 and 76% of the ammonia and 12 and 35% of the nitrite for
AOB- and NOB-inoculated bioreactors, respectively. Efficiencies of phosphate removal were similar in both inoculated and uninoculated
bioreactors, indicating that nitrifiers were not required for this process. AOB-inoculated bioreactors accumulated nitrite
mid-way through the experiment and had low rates of conversion to nitrate, suggesting slow nitrite oxidizer growth. DGGE and
sequence analysis of AOB 16S rRNA genes showed enrichment of Nitrosomonas spp. in both inoculated bioreactors, and a dominance of Nitrosospira spp. in non-inoculated bioreactors. This study describes an inexpensive and efficient technology for removing ammonia and
nitrite from wastewater effluents of municipal treatment plants before its release to the environment. |
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Keywords: | Biofilm bioremediation nitrification polyester support wastewater effluent |
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