The effect of process parameters on use of immobilized algae culture for nitrogen and phosphorus removal from wastewater

Microalgae absorb various nutrients (nitrogen and phosphorus) in wastewater, providing bioproduct production and ensuring sustainability in wastewater treatment. The use of waste biomass becomes more effective with immobilized algae biomass usage. This study aims to investigate the removal of ammoni...

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Bibliographic Details
Published in:International journal of environmental science and technology (Tehran) 2023-06, Vol.20 (6), p.6015-6026
Main Authors: Özgür, Y., Göncü, S.
Format: Article
Language:English
Subjects:
Aquatic Pollution
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Science and Engineering
Original Paper
Soil Science & Conservation
Waste Water Technology
Water Management
Water Pollution Control
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Summary:Microalgae absorb various nutrients (nitrogen and phosphorus) in wastewater, providing bioproduct production and ensuring sustainability in wastewater treatment. The use of waste biomass becomes more effective with immobilized algae biomass usage. This study aims to investigate the removal of ammonium nitrogen (NH 4 + -N) and phosphate (PO 4 3− ) in wastewater taken from the outlet of the primary settling unit of the domestic wastewater treatment plant using immobilized Chlorella Vulgaris pure algae culture. A batch reactor setup was used in the laboratory-scale study. The removal rates of NH 4 + -N and PO 4 3− were evaluated with the effects of different environmental (luminous photoperiod:24-h (h), 16/8 h), chemical (pH: 7.5, 8.0, 8.5 and nitrogen:phosphorus (N:P): 21.4, 18.7, 16.7) and shape factors (bead diameter: 3.4, 5.3 mm) using wastewater samples taken from the presettlement outlet of a typical domestic wastewater treatment plant. pH 8.5 and 24-h luminous photoperiod conditions, the use of 5.3 mm diameter immobilized beads, and the addition of excess phosphate concentration to obtain a nutrient ratio of 16 N:P have increased the NH 4 + -N and PO 4 3− removal rates and algal biomass growth rate. As a result, in the batch reactor using immobilized Chlorella vulgaris algae biomass, 83% NH 4 + -N and 95% PO 4 3− removal rates were achieved in domestic wastewater in approximately 20 h. Graphical abstract
ISSN:1735-1472
1735-2630
DOI:10.1007/s13762-022-04590-1