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Enhanced sulfonamides removal via microalgae-bacteria consortium via co-substrate supplementation
Yue Wang1, Jinghua Li1, Yao Lei1
1School of Materials and Environmental Engineering, Yantai University, Yantai, China.
Bioresource Technology
|June 7, 2022
Summary
Adding glucose or sodium acetate to microalgae-bacteria cultures significantly boosted sulfadiazine removal. Glucose increased biomass production, while both co-substrates altered bacterial communities, impacting antibiotic bioremediation effectiveness.
Area of Science:
- Environmental Microbiology
- Bioremediation
- Algal Biotechnology
Background:
- Microalgae-bacteria consortia show promise for antibiotic removal.
- Co-cultivation and co-substrate addition are key strategies for enhancing bioremediation.
- Sulfonamides, like sulfadiazine (SDZ) and sulfamethoxazole (SMX), are common environmental pollutants.
Purpose of the Study:
- To investigate the effects of glucose and sodium acetate as co-substrates on microalgae-bacteria consortium performance for SDZ and SMX removal.
- To evaluate the impact of co-substrates on microalgal biomass production and antioxidant enzyme activity.
- To analyze the influence of co-substrates on the bacterial community structure during antibiotic bioremediation.
Main Methods:
- Cultivation of microalgae-bacteria consortium with glucose or sodium acetate as co-substrates.
- Quantification of SDZ and SMX removal efficiency.
- Measurement of microalgal biomass production and specific growth rate.
- Assay of antioxidant enzyme activities (peroxidase, superoxide dismutase, catalase).
- Analysis of bacterial community structure using 16S rRNA sequencing.
Main Results:
- Glucose significantly increased biomass production (two-fold) and growth rate compared to sodium acetate.
- Co-substrate addition greatly enhanced SDZ degradation (up to 703% with sodium acetate, 290% with glucose) but had minimal effect on SMX removal.
- Antioxidant enzyme activities decreased with co-substrate supplementation.
- Chlorophyll a showed a protective role against sulfonamides, while chlorophyll b may aid SDZ degradation.
- Co-substrates significantly altered bacterial communities; glucose favored Proteobacteria, and sodium acetate favored Bacteroidetes.
Conclusions:
- Glucose and sodium acetate are effective co-substrates for enhancing microalgae-bacteria mediated sulfadiazine bioremediation.
- Co-substrate addition influences microalgal growth, physiology, and bacterial community composition.
- The study highlights the potential of tailored co-substrate strategies for optimizing antibiotic removal in wastewater treatment.
Keywords:
Bacterial community diversityCo-substrateMicroalgae-bacteria consortiumRefractory organic matterSulfonamidesMore Related Videos
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