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Title: | Autoflocculation of microalgae, via magnesium hydroxide precipitation, in a high rate algal pond treating municipal wastewater in the South Australian Riverland | Authors: | Young, P. Phasey, J. Wallis, I. VANDAMME, Dries Fallowfield, H. |
Issue Date: | 2021 | Publisher: | ELSEVIER | Source: | Algal research, 59 (Art N° 102418) | Abstract: | High rate algal ponds (HRAP) are considered a promising system for coupling wastewater treatment with the growth of microalgae biomass. However, the absence of a cost-effective harvesting method limits this application. In this study, in situ autoflocculation, via magnesium hydroxide precipitation, was assessed in a HRAP containing 33 m 3 of HRAP treated municipal wastewater which had a total suspended solids concentration of 115.00 mg L 1. Autoflocculation was induced using MgCl 2 .6H 2 O to increase the magnesium concentration of the wastewater to 82.63 ± 0.09 mg L 1 , followed by the addition of 182 mg L 1 of slaked lime to increase the pH to 11. A high flocculation efficiency, determined by the reduction in turbidity, of 91.52 ± 0.57% was achieved with good removal of total suspended solids, 84.93 ± 1.00%. Excellent nutrient removal, 91.10 ± 0.14% of total phosphorus, and pathogen removal, a 3 log 10 reduction in E. coli MPN 100 mL 1 , was also observed. Hydro-chemical modelling (PHREECQC-2) identified improvements in operational conditions to reduce cost. Auto-flocculation, via magnesium hydroxide precipitation, was shown to be a promising method for harvesting microalgae and nutrients. | Keywords: | High rate algal ponds;Wastewater;Biomass;Autoflocculation;Microalgae | Document URI: | http://hdl.handle.net/1942/34803 | ISSN: | 2211-9264 | e-ISSN: | 2211-9264 | DOI: | 10.1016/j.algal.2021.102418 | ISI #: | 000694768800011 | Rights: | 2021 Published by Elsevier B.V. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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Young et al. - 2021 - Autoflocculation of microalgae , via magnesium hydroxide precipitation , in a high rate algal pond treating munici.pdf Restricted Access | Published version | 731.32 kB | Adobe PDF | View/Open Request a copy |
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