Effects of staged multiple phytohormones application on capillary-driven attached Chlorella sp. biofilm

Comparing with single phytohormone application, applying multiple phytohormones to microalgae-based wastewater treatment systems can offer more extensive growth-promoting and stress-protecting effects for microalgae, yet the advantage of stress-relieving salicylic acid (SA) under combined phytohormo...

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Bibliographic Details
Published in:Journal of environmental management 2024-02, Vol.351, p.119886-119886, Article 119886
Main Authors: Li, Chi, Wang, Jian-Xia, Wang, Jing-Han, Chi, Zhan-You
Format: Article
Language:English
Subjects:
Anti-oxidative improvement
Biofilms
Biomass
Capillary-driven attached microalgae
Chlorella
Combined phytohormones application
Microalgae
Nitrogen
Plant Growth Regulators - pharmacology
Staged phytohormones addition
Sustained growth-promotion
Topdressing
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Summary:Comparing with single phytohormone application, applying multiple phytohormones to microalgae-based wastewater treatment systems can offer more extensive growth-promoting and stress-protecting effects for microalgae, yet the advantage of stress-relieving salicylic acid (SA) under combined phytohormones application scenario has not been exploited. Employing the improved capillary-driven attached microalgae culturing device (CD-PBR) previously used for single phytohormone application, this study compared the effects of mixed and single phytohormone(s) addition under as low as 10−7 M dosage. In order to make the best of SA for its stress-relieving property, postponed SA addition combined with applying other phytohormone(s) at the beginning of microalgae cultivation was also investigated. Combination of 10−6 M 6-benzylaminopurine (6-BA) with 10−7 M SA was sufficient for enhancing growth-promoting effects and anti-oxidative responses for attached Chlorella sp., while indole-3-acetic acid (IAA) addition was unnecessary. Combination of 6-BA addition at the beginning while postponed SA addition on Day 4 could further sustain such beneficial effects, while removing up to 99.7% total nitrogen (TN) and 97.9% total phosphorus (TP) from the bulk liquid. These results provided innovative strategies on mixed phytohormones addition for microalgae. [Display omitted] •Varied mixed phytohormones addition plans were studied with capillary-driven device.•Mixed phytohormones addition on Day 0 improved algal growth and antioxidant response.•Postponed SA addition further enhanced algal growth and extended growth period.•IAA was unnecessary for Chlorella sp. biofilm in mixed phytohormones addition plans.•The most cost effective plan was 10−6 M 6-BA on Day 0 following 10−7 M SA on Day 4.
ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2023.119886