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Biotechnological exploration of nitrate-accumulating microalgae for nutrient recovery from saline wastewaters

Joeri Coppens (UGent), Bjorge Decostere (UGent), Stijn Van Hulle (UGent), Ingmar Nopens (UGent), Siegfried Vlaeminck (UGent), Leen De Gelder (UGent) and Nico Boon (UGent)
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Abstract
Within sustainable resource management, the recovery of nitrogen and phosphorus nutrients from waste streams is becoming increasingly important. Although the use of microalgae has been described extensively in environmental biotechnology, the potential of nitrate-accumulating microalgae for nutrient recovery has not been investigated yet. The ability of these marine microorganisms to concentrate environmental nitrate within their biomass is remarkable. The aim of this study was to investigate the application potential of nitrate-accumulating diatoms for nutrient recovery from marine wastewaters. The intracellular nitrate storage capacity was quantified for six marine diatom strains in synthetic wastewater. Amphora coffeaeformis and Phaeodactylum tricornutum stored the highest amount of nitrate with respectively 3.15 and 2.10 g N L−1 of cell volume, which accounted for 17.3 and 4.6 %, respectively, of the total nitrogen content. The growth and nitrate and phosphate uptake of both diatoms were further analyzed and based on these features P. tricornutum showed the highest potential for nutrient recovery. A mathematicalmodel was developed which included intracellular nitrate storage and the kinetic parameters were derived for P. tricornutum. Furthermore, a simulation study was performed to compare the performance of a proposed microalgal nutrient recovery unit with a conventional denitrification system for marine wastewater treatment. Overall, this study demonstrates the potential application of P. tricornutum for saline wastewater treatment with concurrent nitrogen and phosphorus recycling.
Keywords
Nutrient removal, Kinetics, Microalgae, Nitrogen recovery, Modeling, Wastewater

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Chicago
Coppens, Joeri, Bjorge Decostere, Stijn Van Hulle, Ingmar Nopens, Siegfried Vlaeminck, Leen De Gelder, and Nico Boon. 2014. “Biotechnological Exploration of Nitrate-accumulating Microalgae for Nutrient Recovery from Saline Wastewaters.” In Global Challenges : Sustainable Wastewater Treatment and Resource Recovery, IWA Specialist Conference, Papers. International Water Association (IWA).
APA
Coppens, Joeri, Decostere, B., Van Hulle, S., Nopens, I., Vlaeminck, S., De Gelder, L., & Boon, N. (2014). Biotechnological exploration of nitrate-accumulating microalgae for nutrient recovery from saline wastewaters. Global Challenges : Sustainable Wastewater Treatment and Resource Recovery, IWA Specialist conference, Papers. Presented at the IWA Specialist conference on Global Challenges : Sustainable Wastewater Treatment and Resource Recovery, International Water Association (IWA).
Vancouver
1.
Coppens J, Decostere B, Van Hulle S, Nopens I, Vlaeminck S, De Gelder L, et al. Biotechnological exploration of nitrate-accumulating microalgae for nutrient recovery from saline wastewaters. Global Challenges : Sustainable Wastewater Treatment and Resource Recovery, IWA Specialist conference, Papers. International Water Association (IWA); 2014.
MLA
Coppens, Joeri, Bjorge Decostere, Stijn Van Hulle, et al. “Biotechnological Exploration of Nitrate-accumulating Microalgae for Nutrient Recovery from Saline Wastewaters.” Global Challenges : Sustainable Wastewater Treatment and Resource Recovery, IWA Specialist Conference, Papers. International Water Association (IWA), 2014. Print.
@inproceedings{6963690,
  abstract     = {Within sustainable resource management, the recovery of nitrogen and phosphorus nutrients from waste streams is becoming increasingly important. Although the use of microalgae has been described extensively in environmental biotechnology, the potential of nitrate-accumulating microalgae for nutrient recovery has not been investigated yet. The ability of these marine microorganisms to concentrate environmental nitrate within their biomass is remarkable. The aim of this study was to investigate the application potential of nitrate-accumulating diatoms for nutrient recovery from marine wastewaters. The intracellular nitrate storage capacity was quantified for six marine diatom strains in synthetic wastewater. Amphora coffeaeformis and Phaeodactylum tricornutum stored the highest amount of nitrate with respectively 3.15 and 2.10 g N L\ensuremath{-}1 of cell volume, which accounted for 17.3 and 4.6 \%, respectively, of the total nitrogen content. The growth and nitrate and phosphate uptake of both diatoms were further analyzed and based on these features P. tricornutum showed the highest potential for nutrient recovery. A mathematicalmodel was developed which included intracellular nitrate storage and the kinetic parameters were derived for P. tricornutum. Furthermore, a simulation study was performed to compare the performance of a proposed microalgal nutrient recovery unit with a conventional denitrification system for marine wastewater treatment. Overall, this study demonstrates the potential application of P. tricornutum for saline wastewater treatment with concurrent nitrogen and phosphorus recycling.},
  author       = {Coppens, Joeri and Decostere, Bjorge and Van Hulle, Stijn and Nopens, Ingmar and Vlaeminck, Siegfried and De Gelder, Leen and Boon, Nico},
  booktitle    = {Global Challenges : Sustainable Wastewater Treatment and Resource Recovery, IWA Specialist conference, Papers},
  keyword      = {Nutrient removal,Kinetics,Microalgae,Nitrogen recovery,Modeling,Wastewater},
  language     = {eng},
  location     = {Kathmandu, Nepal},
  pages        = {4},
  publisher    = {International Water Association (IWA)},
  title        = {Biotechnological exploration of nitrate-accumulating microalgae for nutrient recovery from saline wastewaters},
  year         = {2014},
}