The effect of harvesting on biomass production and nutrient removal in phototrophic biofilm reactors for effluent polishing

N.C. Boelee, M. Janssen, H. Temmink, L. Taparaviciute, R. Khiewwijit, A. Janoska, C.J.N. Buisman, R.H. Wijffels

Research output: Contribution to journalArticleAcademicpeer-review

23 Citations (Scopus)

Abstract

An increasing number of wastewater treatment plants require post-treatment to remove residual nitrogen and phosphorus. This study investigated various harvesting regimes that would achieve consistent low effluent concentrations of nitrogen and phosphorus in a phototrophic biofilm reactor. Experiments were performed in a vertical biofilm reactor under continuous artificial lighting and employing artificial wastewater. Under similar conditions, experiments were performed in near-horizontal flow lanes with biofilms of variable thickness. It was possible to maintain low nitrogen and phosphorus concentrations in the effluent of the vertical biofilm reactor by regularly harvesting half of the biofilm. The average areal biomass production rate achieved a 7 g dry weight m-2 day-1 for all different harvesting frequencies tested (every 2, 4, or 7 days), corresponding to the different biofilm thicknesses. Apparently, the biomass productivity is similar for a wide range of biofilm thicknesses. The biofilm could not be maintained for more than 2 weeks as, after this period, it spontaneously detached from the carrier material. Contrary to the expectations, the biomass production doubled when the biofilm thickness was increased from 130 µm to 2 mm. This increased production was explained by the lower density and looser structure of the 2 mm biofilm. It was concluded that, concerning biomass production and labor requirement, the optimum harvesting frequency is once per week.
Original languageEnglish
Pages (from-to)1439-1452
JournalJournal of Applied Phycology
Volume26
Issue number3
DOIs
Publication statusPublished - 2014

Fingerprint

biofilm
effluents
biomass production
effluent
biomass
nutrients
phosphorus
nutrient removal
effect
reactor
nitrogen
wastewater treatment
wastewater
lighting
labor
experiment
productivity

Keywords

  • waste water treatment
  • biofilms
  • thickness
  • density
  • algae
  • biological water treatment plants
  • phototropism
  • nitrogen
  • phosphorus
  • removal
  • biobased economy
  • waste-water treatment
  • photosynthetic efficiency
  • chlorella-sorokiniana
  • microalgal biofilms
  • phosphorus removal
  • mass-transport
  • fresh-water
  • light
  • growth

Cite this

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title = "The effect of harvesting on biomass production and nutrient removal in phototrophic biofilm reactors for effluent polishing",
abstract = "An increasing number of wastewater treatment plants require post-treatment to remove residual nitrogen and phosphorus. This study investigated various harvesting regimes that would achieve consistent low effluent concentrations of nitrogen and phosphorus in a phototrophic biofilm reactor. Experiments were performed in a vertical biofilm reactor under continuous artificial lighting and employing artificial wastewater. Under similar conditions, experiments were performed in near-horizontal flow lanes with biofilms of variable thickness. It was possible to maintain low nitrogen and phosphorus concentrations in the effluent of the vertical biofilm reactor by regularly harvesting half of the biofilm. The average areal biomass production rate achieved a 7 g dry weight m-2 day-1 for all different harvesting frequencies tested (every 2, 4, or 7 days), corresponding to the different biofilm thicknesses. Apparently, the biomass productivity is similar for a wide range of biofilm thicknesses. The biofilm could not be maintained for more than 2 weeks as, after this period, it spontaneously detached from the carrier material. Contrary to the expectations, the biomass production doubled when the biofilm thickness was increased from 130 µm to 2 mm. This increased production was explained by the lower density and looser structure of the 2 mm biofilm. It was concluded that, concerning biomass production and labor requirement, the optimum harvesting frequency is once per week.",
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author = "N.C. Boelee and M. Janssen and H. Temmink and L. Taparaviciute and R. Khiewwijit and A. Janoska and C.J.N. Buisman and R.H. Wijffels",
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The effect of harvesting on biomass production and nutrient removal in phototrophic biofilm reactors for effluent polishing. / Boelee, N.C.; Janssen, M.; Temmink, H.; Taparaviciute, L.; Khiewwijit, R.; Janoska, A.; Buisman, C.J.N.; Wijffels, R.H.

In: Journal of Applied Phycology, Vol. 26, No. 3, 2014, p. 1439-1452.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - The effect of harvesting on biomass production and nutrient removal in phototrophic biofilm reactors for effluent polishing

AU - Boelee, N.C.

AU - Janssen, M.

AU - Temmink, H.

AU - Taparaviciute, L.

AU - Khiewwijit, R.

AU - Janoska, A.

AU - Buisman, C.J.N.

AU - Wijffels, R.H.

PY - 2014

Y1 - 2014

N2 - An increasing number of wastewater treatment plants require post-treatment to remove residual nitrogen and phosphorus. This study investigated various harvesting regimes that would achieve consistent low effluent concentrations of nitrogen and phosphorus in a phototrophic biofilm reactor. Experiments were performed in a vertical biofilm reactor under continuous artificial lighting and employing artificial wastewater. Under similar conditions, experiments were performed in near-horizontal flow lanes with biofilms of variable thickness. It was possible to maintain low nitrogen and phosphorus concentrations in the effluent of the vertical biofilm reactor by regularly harvesting half of the biofilm. The average areal biomass production rate achieved a 7 g dry weight m-2 day-1 for all different harvesting frequencies tested (every 2, 4, or 7 days), corresponding to the different biofilm thicknesses. Apparently, the biomass productivity is similar for a wide range of biofilm thicknesses. The biofilm could not be maintained for more than 2 weeks as, after this period, it spontaneously detached from the carrier material. Contrary to the expectations, the biomass production doubled when the biofilm thickness was increased from 130 µm to 2 mm. This increased production was explained by the lower density and looser structure of the 2 mm biofilm. It was concluded that, concerning biomass production and labor requirement, the optimum harvesting frequency is once per week.

AB - An increasing number of wastewater treatment plants require post-treatment to remove residual nitrogen and phosphorus. This study investigated various harvesting regimes that would achieve consistent low effluent concentrations of nitrogen and phosphorus in a phototrophic biofilm reactor. Experiments were performed in a vertical biofilm reactor under continuous artificial lighting and employing artificial wastewater. Under similar conditions, experiments were performed in near-horizontal flow lanes with biofilms of variable thickness. It was possible to maintain low nitrogen and phosphorus concentrations in the effluent of the vertical biofilm reactor by regularly harvesting half of the biofilm. The average areal biomass production rate achieved a 7 g dry weight m-2 day-1 for all different harvesting frequencies tested (every 2, 4, or 7 days), corresponding to the different biofilm thicknesses. Apparently, the biomass productivity is similar for a wide range of biofilm thicknesses. The biofilm could not be maintained for more than 2 weeks as, after this period, it spontaneously detached from the carrier material. Contrary to the expectations, the biomass production doubled when the biofilm thickness was increased from 130 µm to 2 mm. This increased production was explained by the lower density and looser structure of the 2 mm biofilm. It was concluded that, concerning biomass production and labor requirement, the optimum harvesting frequency is once per week.

KW - afvalwaterbehandeling

KW - biofilms

KW - dikte

KW - dichtheid

KW - algen

KW - biologische waterzuiveringsinstallaties

KW - fototropie

KW - stikstof

KW - fosfor

KW - verwijdering

KW - biobased economy

KW - waste water treatment

KW - biofilms

KW - thickness

KW - density

KW - algae

KW - biological water treatment plants

KW - phototropism

KW - nitrogen

KW - phosphorus

KW - removal

KW - biobased economy

KW - waste-water treatment

KW - photosynthetic efficiency

KW - chlorella-sorokiniana

KW - microalgal biofilms

KW - phosphorus removal

KW - mass-transport

KW - fresh-water

KW - light

KW - growth

U2 - 10.1007/s10811-013-0178-1

DO - 10.1007/s10811-013-0178-1

M3 - Article

VL - 26

SP - 1439

EP - 1452

JO - Journal of Applied Phycology

JF - Journal of Applied Phycology

SN - 0921-8971

IS - 3

ER -