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

Leong, W.-H. and Lim, J.-W. and Lam, M.-K. and Uemura, Y. and Ho, C.-D. and Ho, Y.-C. (2018) Co-cultivation of activated sludge and microalgae for the simultaneous enhancements of nitrogen-rich wastewater bioremediation and lipid production. Journal of the Taiwan Institute of Chemical Engineers, 87. pp. 216-224.

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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. © 2018 Taiwan Institute of Chemical Engineers

Item Type: Article
Impact Factor: cited By 0
Uncontrolled Keywords: Algae; Biomass; Bioreactors; Bioremediation; Microorganisms, Activated sludge; Co-cultivation; Kinetic growth; Lipid productions; Micro-algae, Nitrogen removal
Departments / MOR / COE: Research Institutes > Institute for Sustainable Building
Depositing User: Mr Ahmad Suhairi Mohamed Lazim
Date Deposited: 01 Aug 2018 03:13
Last Modified: 23 Oct 2018 00:59
URI: http://scholars.utp.edu.my/id/eprint/21534

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