Tapping into the ballast potential of sparingly soluble salts for enhanced floc physiognomies in algae biomass harvesting

Oladoja, N.A., Ali, J., Lei, W., Yudong, N. and Pan, G. ORCID: 0000-0003-0920-3018, 2020. Tapping into the ballast potential of sparingly soluble salts for enhanced floc physiognomies in algae biomass harvesting. Separation and Purification Technology, 248: 117150. ISSN 1383-5866

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Abstract

Enhanced floc settling rates and reduced biomass volume were achieved when sparingly soluble salts of magnesium were used as ballast agent in the pH induced algae biomass harvesting operation. The floc characteristics of biomass harvested from non-ballasted pH induced system were compared with that of pH induced ballasted system that contained soluble (MgCl2) and sparingly soluble salts (i.e., Mg(OH)2 and Mg(OH)2 nanoparticles (NMg(OH)2)). The pH value for onset of coagulation was lower in soluble salt system (pH = 10.2) than in the sparingly soluble salt (pH = 11.4). The floc generated from the ballasted NMg(OH)2 system had the highest sedimentation rate (K (L/mol/s) = 1.0454), while that of the non-ballasted pH induced system had the lowest rate (K (L/mol/s) = 0.2155). The ballast agent enhanced the sludge volume index of the biomass by 66.04% and had no negative impact on the filterability. The values of the the specific cake resistance (α (m/kg)) and the resistance of the filter medium (Rm (1/m)) were within the same range. Both the growing and harvested biomass exhibited good strength and recovery factor (>90%). The evaluation of the effects of the ballast agents on the biomass viability showed that the ballast agent was not toxic to the harvested biomass.

Item Type: Journal article
Publication Title: Separation and Purification Technology
Creators: Oladoja, N.A., Ali, J., Lei, W., Yudong, N. and Pan, G.
Publisher: Elsevier
Date: 1 October 2020
Volume: 248
ISSN: 1383-5866
Identifiers:
NumberType
10.1016/j.seppur.2020.117150DOI
S1383586620316245Publisher Item Identifier
1328781Other
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Depositing User: Linda Sullivan
Date Added: 26 May 2020 12:05
Last Modified: 08 Jun 2020 15:24
URI: http://irep.ntu.ac.uk/id/eprint/39892

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