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  • Effect of temperature over start-up of a groundwater-denitrifying submerged filter inoculated with psychrotolerant bacteria.

    Author(s) : Gómez, M. A.González-López, J.Rua, A. de la

    Author Affiliation : Technologies for Water Management and Treatment Group, Department of Civil Engineering and Water Research Institute, Campus de Fuentenueva s/n, University of Granada, 18071, Granada, Spain.

    Author Email : mgomezn@ugr.es

    Journal article : Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances & Environmental Engineering 2009 Vol.44 No.12 pp.1298-1305 ref.20

    Abstract : Inoculation of a submerged filter was carried out using three bacterial strains previously selected on the basis of their psychrotolerance and high denitrifying activity with the aim of apply selective inoculation to a submerged filter system for the denitrificationdenitrificationSubject Category: Miscellaneous
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    of groundwater. Laboratory-scale assays were carried out at 5, 10 20 and 30°C. Surface scanning microscopy was used to evaluate the capacity of each inoculant to colonise the support. In all cases a biofilm in the initial stages of development was observed, with abundant connection material and cells in division. Increase in temperaturetemperatureSubject Category: Properties
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    had a negative effect on colonisation evolution, motivated by the use of psychrotolerant bacteriabacteriaSubject Category: Organism Names
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    . Each inoculant presented a different colonisation optimum, but always at temperatures under 20°C. To monitor system setup, concentrations of total nitrogen, nitrate and nitrite after treatment were measured. In most cases, the stabilisation phase was observed to be longer at lower temperatures, independently of the inoculant employed. However, at 5°C, only one of the inoculants reached steady-state phase with total nitrogen elimination. In all the assays, an accumulation of nitrite was observed during stabilisation phase. At lower temperatures, maximum concentrations of nitrite were greater and were reached after longer operation times. Use of selective inoculants was shown to promote subsequent development of a stable biofilm achieving efficient elimination of nitrate from the influent. This occurs regardless of the inoculant employed, except at a temperature of 5°C, at which the type of inoculant conditions system setup. However, colonisation capacity of the inoculant at low temperatures is not a determining factor.

    ISSN : 1093-4529

    DOI : 10.1080/10934520903140124

    Record Number : 20093327595

    Publisher : Taylor & Francis

    Location of publication : Philadelphia

    Country of publication : USA

    Language of text : English

    Indexing terms for this abstract:

    Organism descriptor(s) : BacteriabacteriaSubject Category: Organism Names
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    Descriptor(s) : biofilmsbiofilmsSubject Category: Commodities and Products
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    , biological treatmentbiological treatmentSubject Category: Techniques, Methodologies and Equipment
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    , bioremediationbioremediationSubject Category: Techniques, Methodologies and Equipment
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    , denitrificationdenitrificationSubject Category: Miscellaneous
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    , filtersfiltersSubject Category: Techniques, Methodologies and Equipment
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    , filtrationfiltrationSubject Category: Techniques, Methodologies and Equipment
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    , groundwatergroundwaterSubject Category: Miscellaneous
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    , groundwater pollutiongroundwater pollutionSubject Category: Miscellaneous
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    , polluted waterpolluted waterSubject Category: Miscellaneous
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    , temperaturetemperatureSubject Category: Properties
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    , water qualitywater qualitySubject Category: Properties
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    , water treatmentwater treatmentSubject Category: Techniques, Methodologies and Equipment
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    Identifier(s) : bacterium, water composition and quality

    Broader term(s) : prokaryotesprokaryotesSubject Category: Organism Names
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