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  • 1.
    Larsdotter, Karin
    et al.
    KTH, School of Biotechnology (BIO), Bioprocess Technology.
    Jansen, Jes La Cour
    Dalhammar, Gunnel
    KTH, School of Biotechnology (BIO), Environmental Microbiology.
    Biologically mediated phosphorus precipitation in wastewater treatment with microalgae2007In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 28, no 9, p. 953-960Article in journal (Refereed)
    Abstract [en]

    A lab-scale continuous microalgal culture was grown on sterile-filtered wastewater in order to clarify the phosphorus removing mechanisms in a microalgal treatment step that treats residual phosphorus from a hydroponic wastewater treatment pilot plant. The phosphorus assimilation was dependent on algal biomass production, whereas the chemical precipitation was dependent on phosphorus load, i.e. an increase in average precipitation rate with decreased hydraulic retention time was observed. The chemical precipitation was mainly a result of the increased pH, which was biologically mediated by the photosynthesising algae. The precipitate was composed of a calcium phosphate with magnesium included, magnesium hydroxide and calcite. A significant nitrogen removal was also experienced, which implies that the microalgal wastewater treatment is appropriate both for phosphorus and nitrogen removal.

  • 2.
    Larsdotter, Karin
    et al.
    KTH, School of Biotechnology (BIO), Bioprocess Technology.
    Jansen, Jes La Cour
    Dalhammar, Gunnel
    KTH, School of Biotechnology (BIO), Environmental Microbiology.
    Microalgae as a phosphorus trap after hydroponic wastewater treatmentManuscript (Other academic)
  • 3.
    Larsdotter, Karin
    et al.
    KTH, School of Biotechnology (BIO), Bioprocess Technology.
    Jansen, Jes la Cour
    Dalhammar, Gunnel
    KTH, School of Biotechnology (BIO).
    Phosphorus removal from wastewater by microalgae in Sweden: a year-round perspective2010In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 31, no 2, p. 117-123Article in journal (Refereed)
    Abstract [en]

    The phosphorus and nitrogen removing capacity of a microalgal treatment step in Sweden was studied during an annual cycle. The treatment step had been constructed for extended phosphorus removal in a hydroponic wastewater treatment system, which had been built in a greenhouse. Two culture depths (17 and 33 cm) were compared as well as the effect of additional illumination during winter. The results showed large fluctuations in algal biomass production and phosphorus removal as a result of season. The phosphorus removal efficiency showed a clear correlation with pH, and the shallow cultures generally had higher phosphorus removal efficiencies than the deeper cultures. The efficiencies were between 60% and 100% during summer but mostly lower than 25% during winter, except in the shallow culture with extra illumination where efficiencies of 60-80% were recorded even during winter. A nitrogen removal efficiency of around 40% was reached for most parts of the year, and efficiencies of up to 60-80% were achieved during summer in the shallow cultures. In conclusion, the results showed that a large proportion of the phosphorus could be removed on a year-round basis, hence reducing the need for chemical precipitation, and also that significant nitrogen removal is possible.

  • 4.
    Larsdotter, Karin
    et al.
    KTH, Superseded Departments.
    Norström, Anna
    KTH, Superseded Departments.
    Gumaelius, Lena
    KTH, Superseded Departments.
    Jansen, Jes La Cour
    Dalhammar, Gunnel
    KTH, Superseded Departments.
    A small scale hydroponics wastewater treatment system under Swedish conditions2003In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 48, no 11, p. 161-167Article in journal (Refereed)
    Abstract [en]

    A treatment plant using conventional biological treatment combined with hydroponics and microalgae is constructed in a greenhouse in the area of Stockholm, Sweden. The treatment plant is built for research purposes and presently treats 0.559 m(3) of domestic wastewater from the surrounding area per day. The system uses anoxic pre-denitrification followed by aerobic tanks for nitrification and plant growth. A microalgal step further reduces phosphorus, and a final sand filter polishes the water. During a three week period in July 2002 the treatment capacity of this system was evaluated with respect to removal of organic matter, phosphorus and nitrogen. 90% COD removal was obtained early in the system. Nitrification and denitrification was well established with total nitrogen reduction of 72%. Phosphorus was removed by 47% in the process. However, higher phosphorus removal values are expected as the microalgal step will be further developed. The results show that acceptable treatment can be achieved using this kind of system. Further optimisation of the system will lead to clean water as well as valuable plants to be harvested from the nutrient rich wastewater.

  • 5.
    Norström, Anna
    et al.
    KTH, School of Biotechnology (BIO).
    La Cour Jansen, Jes
    Dalhammar, Gunnel
    KTH, School of Biotechnology (BIO).
    Energy savings versus year‐round production in a small hydroponic system for wastewater treatment.In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732Article in journal (Other academic)
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