Co-cultivation of activated sludge and microalgae for the simultaneous enhancements of nitrogen-rich wastewater bioremediation and lipid production

doi:10.1016/j.jtice.2018.03.038

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Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/113421

Title:	Co-cultivation of activated sludge and microalgae for the simultaneous enhancements of nitrogen-rich wastewater bioremediation and lipid production
Authors:	Wai-Hong Leong;Jun-Wei Lim;Man-Kee Lam;Yoshimitsu Uemura;Chii-Dong Ho;Yeek-Chia Ho
Keywords:	Co-cultivation;Activated sludge;Microalgae;Nitrogen removal;Lipid production;Kinetic growth
Date:	2018-06
Issue Date:	2018-05-17 12:10:55 (UTC+8)
Publisher:	Elsevier
Abstract:	The symbiotic relationships between activated sludge and microalgae were explored for bio-remediating nitrogen-rich wastewater and producing lipid-based biofuel simultaneously. Various inoculation ratios of activated sludge to microalgae (AS:MA) biomasses were employed to unveil the mechanism of NH4+-N removal in relation to lipid production from algal-bacterial biomass. The presence of nitrifiers in converting NH4+-N into oxidized nitrogen (NO2−-N and NO3−-N) had greatly enhanced the total nitrogen removal in the co-cultivation bioreactors as compared with the individual culture of either activated sludge or microalgae. Accordingly, achieving near complete nitrogen removal (97–98%) when the bioreactors were inoculated with AS:MA ratios of 1:0.75 and beyond. The kinetic growths of co-cultivated activated sludge and microalgae biomasses were also investigated using Verhulst model; demonstrating a significant increase of specific biomass growth rate with increasing of initial microalgae inoculation ratio. The AS:MA ratio of 1:0.75 was considered optimum for the symbiotic algal-bacterial interactions, attaining the highest lipid yield of 130 mg/L and flocculation efficiency of 42% which would aid the biomass harvesting process.
Relation:	Journal of the Taiwan Institute of Chemical Engineers 87, p.216-224
DOI:	10.1016/j.jtice.2018.03.038
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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