Bioremediation of sulfonamides by a microalgae-bacteria consortium – Analysis of pollutants removal efficiency, cellular composition, and bacterial community. (May 2022)

• Record Type: Journal Article
• Authors: Wang, Yue; Li, Jinghua; Lei, Yao; Li, Xiaoqiang; Nagarajan, Dillirani; Lee, Duu-Jong; Chang, Jo-Shu
• Is Part Of: Bioresource technology. Volume 351(2022)
• Publication Date: 2022-05
• Subjects: Sulfonamides -- Microalgae-bacteria consortium -- Extracellular polymer substances -- Antioxidant enzymes -- Bacterial community; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.126964
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Ecotoxicological effects of SDZ and SMX on the microalgae-bacteria consortium were evaluated. Intracellular antioxidant enzymes and pigments were influenced by SDZ and SMX. EPS was shown to be associated with granule formation in presence of SDZ. The bacterial community in the presence of SAs was identified by high throughput sequencing. CAT and POD played a crucial role in intracellular sulfonamides biodegradation. Abstract: Antibiotics in wastewaters (e.g., sulfonamides (SAs)) are not effectively removed by the conventional bacterial processes. In this study, a microalgae ( Scenedesmus obliquus )-based process was evaluated for the removal of SAs. The maximum removal efficiency of sulfadiazine (SDZ) and sulfamethoxazole (SMX) by the consortium was 5.85% and 40.84%, respectively. The lower SDZ biodegradation efficiency could be due to the difference in the lipophilic degree related to cell binding. The presence of SAs did not significantly inhibit the biomass production of the consortium (1311–1952 mg/L biomass) but led to a 36–51% decrease in total polysaccharide content and an increase in microalgae's protein content, which caused granule formation. The presence of SMX and SDZ resulted in an increase in lipid peroxidation activity with a 6.2 and 23.5-fold increase in malondialdehyde content, respectively. Rhodobacter and Phreatobacter were abundant in the consortium with SAs' presence, while alinarimonas, Catalinimonas and Cecembia were seen in their absence .