eprintid: 12802
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/01/28/02
datestamp: 2023-11-10 03:27:21
lastmod: 2023-11-10 03:27:21
status_changed: 2023-11-10 01:49:33
type: article
metadata_visibility: show
creators_name: Rosli, S.S.
creators_name: Wong, C.Y.
creators_name: Yunus, N.M.
creators_name: Lam, M.K.
creators_name: Show, P.L.
creators_name: Cheng, C.K.
creators_name: Wang, D.K.
creators_name: Oh, W.D.
creators_name: Lim, J.W.
title: Optimum interaction of light intensity and CO2 concentration in bioremediating N-rich real wastewater via assimilation into attached microalgal biomass as the feedstock for biodiesel production
ispublished: pub
keywords: Biodiesel; Bioreactors; Bioremediation; Carbon dioxide; Effluents; Fertilizers; Fluidized beds; Polyurethanes; Rigid foamed plastics; Saturated fatty acids, Biodiesel production; Bioremediation technologies; Chemical fertilizers; Extra-cellular polymeric substances; Fatty acid methyl esters (FAMEs); Fluidized bed bioreactors; Manufacturing industries; Transesterification process, Biomass
note: cited By 57
abstract: Impoverishing nutrients from wastewater via assimilation into microalgal biomass has gained footprint in bioremediation technologies. To ease the harvesting of mature microalgal biomass from effluent, this study proposed the employment of fluidized bed bioreactor to grow attached microalgal biomass onto polyurethane foam support material while bioremediating the N-rich real wastewater from chemical fertilizer manufacturing industry. The complete removals of all nitrogen species (NH4+-N, NO2�-N and NO3�-N) together with COD and total phosphorus were achieved at the optimum light intensity and CO2 concentration of 216 μmol/m2 s and 9.1 , respectively, giving rise to the attached microalgal biomass productivity of 0.094 g/L/day. These performances were also found maintaining for at least 4 cycles of reiterative uses of spent polyurethane foam support material in similar fluidized bed bioreactor setup condition with every cycle being introduced with fresh N-rich real wastewater. The mechanism of attachment formations study predicted that the polysaccharides and proteins from microalgal extracellular polymeric substances had bridged the cells onto polyurethane foam support material during the initial colonization prior to populating and growing to cover the surfaces of support material. For biodiesel production, the extracted neutral lipid content of attached microalgal biomass was found to be four times higher than the suspended growth culture. From the transesterification process, about 97 �98  of attached microalgal lipid could be converted into fatty acid methyl esters (FAMEs) mixture. Interestingly, the degree of saturated fatty acids (SFA) in FAMEs was recorded increasing with the increase of cycles of reusing spent polyurethane foam support material. The presence of more SFA in FAMEs could overall enhance the oxidative stability and contribute to higher cetane number of produced biodiesel from facilely harvested attached microalgal biomass. © 2020 Institution of Chemical Engineers
date: 2020
publisher: Institution of Chemical Engineers
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85086470739&doi=10.1016%2fj.psep.2020.05.045&partnerID=40&md5=f3c4f46ebaca749f0b65e4114b9d3a43
id_number: 10.1016/j.psep.2020.05.045
full_text_status: none
publication: Process Safety and Environmental Protection
volume: 141
pagerange: 355-365
refereed: TRUE
issn: 09575820
citation:   Rosli, S.S. and Wong, C.Y. and Yunus, N.M. and Lam, M.K. and Show, P.L. and Cheng, C.K. and Wang, D.K. and Oh, W.D. and Lim, J.W.  (2020) Optimum interaction of light intensity and CO2 concentration in bioremediating N-rich real wastewater via assimilation into attached microalgal biomass as the feedstock for biodiesel production.  Process Safety and Environmental Protection, 141.  pp. 355-365.  ISSN 09575820