Non-suspended microalgae cultivation for wastewater refinery and biomass production

[Display omitted] •Non-suspended microalgae achieve easy biomass recovery and high stress resistance.•TN and TP could get a 90% removal with load rate higher than 150 mg·L−1·d−1.•Above 70% TN and TP were transferred from wastewater to microalgae biomass.•The dynamic growth of non-suspended microalga...

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Bibliographic Details
Published in:Bioresource technology 2020-07, Vol.308, p.123320-123320, Article 123320
Main Authors: Zhuang, Lin-Lan, Li, Mengting, Hao Ngo, Huu
Format: Article
Language:English
Subjects:
Attached microalgae cultivation
Biomass
Extracellular polymeric substance
Immobilized microalgae cultivation
Lipids
Microalgae
Nitrogen
Nitrogen and phosphorus transfer
Phosphorus
Waste Water
Wastewater purification
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Summary:[Display omitted] •Non-suspended microalgae achieve easy biomass recovery and high stress resistance.•TN and TP could get a 90% removal with load rate higher than 150 mg·L−1·d−1.•Above 70% TN and TP were transferred from wastewater to microalgae biomass.•The dynamic growth of non-suspended microalgae determined the pollutant removal rate.•The mechanism of pollutant transfer and microalgae growth require investigation. Non-suspended microalgae cultivation technology coupled with wastewater purification has received more scientific attention in recent decades. Since the non-suspended microalgae cultivation is quite different from the suspended ones, the following issues are compared in this study such as advantages and disadvantages, pollutant removal mechanisms and regulations, influential factors, and microalgae biomass accumulation. The analysis aims to support the further application of this technology. The median removal rates of COD, TN, TP, NH4+-N and NO3−-N were 91.6%, 78.2%, 87.5%, 93.2% and 81.7%, respectively, by non-suspended microalgae under the TN & TP load rates up to 150 mg·L−1·d−1. The main pathway for TN & TP removal is microalgae cell absorbance. Light intensity, pollutant composition and microalgae metabolic types are the major factors that influence pollutant removal and the lipid content of microalgae. Meanwhile the mechanism concerning how macro-outer conditions influence the micro-environment and further growth of non-suspended microalgae requires more investigation.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2020.123320