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Biological Denitrification in Drinking Water Treatment Using the Seaweed Gracilaria Verrucosa as Carbon Source and Biofilm Carrier

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Chemical and microbiological aspects were investigated with regard to biological denitrification of drinking water using the seaweed Gracilaria verrucosa as the carbon and energy substrate and as physical support for the microbial flora in semibatch, fixed-bed reactors. Complete removal of nitrate (100 mg/L) was readily achieved without accumulation of nitrite. Microbiological analysis indicated that the effluent of the reactor contained high numbers of bacteria (>10 6/mL total count). Among the 44 bacterial strains isolated directly from the samples or isolated after enrichment at 37°C, 25 different fatty acid profiles were found, indicating a complex microflora, including potential pathogens.
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Keywords: Gracilaria verrucosa; biological denitrification; carbon source; drinking water; fixed bed; seaweed

Document Type: Research Article

Publication date: 2006-04-01

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    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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