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Bacterially mediated removal of phosphorus and cycling of nitrate and sulfate in the waste stream of a "zero-discharge" recirculating mariculture system.
Krom, M D; Ben David, A; Ingall, E D; Benning, L G; Clerici, S; Bottrell, S; Davies, C; Potts, N J; Mortimer, R J G; van Rijn, J.
Afiliación
  • Krom MD; School of Earth and Environment, Leeds University, UK; Charney School of Marine Sciences, Haifa University, Israel.
  • Ben David A; The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel.
  • Ingall ED; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, USA.
  • Benning LG; School of Earth and Environment, Leeds University, UK.
  • Clerici S; School of Earth and Environment, Leeds University, UK.
  • Bottrell S; School of Earth and Environment, Leeds University, UK.
  • Davies C; School of Earth and Environment, Leeds University, UK.
  • Potts NJ; School of Earth and Environment, Leeds University, UK.
  • Mortimer RJ; School of Earth and Environment, Leeds University, UK.
  • van Rijn J; The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel. Electronic address: jaap.vanrijn@mail.huji.ac.il.
Water Res ; 56: 109-21, 2014 Jun 01.
Article en En | MEDLINE | ID: mdl-24657541
Simultaneous removal of nitrogen and phosphorus by microbial biofilters has been used in a variety of water treatment systems including treatment systems in aquaculture. In this study, phosphorus, nitrate and sulfate cycling in the anaerobic loop of a zero-discharge, recirculating mariculture system was investigated using detailed geochemical measurements in the sludge layer of the digestion basin. High concentrations of nitrate and sulfate, circulating in the overlying water (∼15 mM), were removed by microbial respiration in the sludge resulting in a sulfide accumulation of up to 3 mM. Modelling of the observed S and O isotopic ratios in the surface sludge suggested that, with time, major respiration processes shifted from heterotrophic nitrate and sulfate reduction to autotrophic nitrate reduction. The much higher inorganic P content of the sludge relative to the fish feces is attributed to conversion of organic P to authigenic apatite. This conclusion is supported by: (a) X-ray diffraction analyses, which pointed to an accumulation of a calcium phosphate mineral phase that was different from P phases found in the feces, (b) the calculation that the pore waters of the sludge were highly oversaturated with respect to hydroxyapatite (saturation index = 4.87) and (c) there was a decrease in phosphate (and in the Ca/Na molar ratio) in the pore waters simultaneous with an increase in ammonia showing there had to be an additional P removal process at the same time as the heterotrophic breakdown of organic matter.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Fósforo / Sulfatos / Acuicultura / Reactores Biológicos / Aguas Residuales / Nitratos Idioma: En Revista: Water Res Año: 2014 Tipo del documento: Article País de afiliación: Israel Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Fósforo / Sulfatos / Acuicultura / Reactores Biológicos / Aguas Residuales / Nitratos Idioma: En Revista: Water Res Año: 2014 Tipo del documento: Article País de afiliación: Israel Pais de publicación: Reino Unido