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Bioresource Technology

Bioresource Technology

IF: 9.69
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Effect of light intensity on nitrogen removal, enzymatic activity and metabolic pathway of algal-bacterial symbiosis in rotating biological contactor treating mariculture wastewater

Published:23 November 2024 DOI: 10.1016/j.biortech.2024.131872
Guangyu Chu, Chang Gao, Mengchun Gao

Abstract

An algal-bacterial symbiosis (ABS) system was developed on a rotating biological contactor treating mariculture wastewater, and its nitrogen removal, enzymatic activity and metabolic pathways were investigated under different light intensities. The nitrogen removal efficiency increased when light intensities ranged from 20 to 80 μE/(m2·s) but declined under 100 μE/(m2·s). Higher enzymatic activities under 80 μE/(m2·s) facilitated nitrogen conversion, light utilization, ATP supply and photosynthesis. Reactive oxygen species accumulation activated antioxidant pathways under 20 and 100 μE/(m2·s). Functional bacteria including Sedimentitalea, Thauera and Dechloromonas as well as Chlorella sorokinian, Dunaliella, Pleurosira laevis and Microcystis were enriched under 80 μE/(m2·s). Abundant photosynthesis-related genes (petC, Lca3/4 and atpH/A) supported energy supply and electron transport. Conversely, lower proportions of IDH3, gltB, and acnA/B under 20 and 100 μE/(m2·s) hindered tricarboxylic acid cycle, reducing NADPH and energy production. These results enhance the understanding on the effect of light intensity on ABS system treating mariculture wastewater.

Substances (3)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Glutathione 70-18-8 C10H17N3O6S 1142 suppliers $6.00-$3420.00
Superoxide dismutase 9054-89-1 NULL 369 suppliers $53.30-$3360.00
propanedial 542-78-9 C3H4O2 23 suppliers Inquiry

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