We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Organics removal pathways and algae-bacteria interactions of microalgal-bacterial granular sludge treating real municipal wastewater
Summary
Researchers investigated organic removal performance and mechanisms in microalgal-bacterial granular sludge treating real municipal wastewater across day-night cycles, finding that algae-bacteria interactions drive effective disposal of complex organics through complementary metabolic pathways.
Abstract Algae-bacteria interactions play an essential role in the transformation of complex organics in microalgal-bacterial granular sludge (MBGS), but the intrinsic removal mechanisms have not been well understood. This study thus attempted to investigate the removal performance and mechanisms of complex organics in real municipal wastewater in MBGS process. The results showed that complex organics could be effectively disposed during day-night cycles by MBGS, with the process performance significant impacted by the influent C/N ratio. Further metagenomic and metatranscriptomic analyses revealed that the upregulated gap2 and gpmA genes of glycolysis enhanced the conversion of complex organics to CO2 mediated by Chlorophyceae and Acidobacteriae/Sumerlaeia/Fimbriimonadia, while the upregulated petH gene of NADPH synthesis by Cyanobacteria strengthened the fixation of CO2 into biomass. Meanwhile, the functional gene of amyA in the starch metabolism by Actinobacteriota was upregulated, along with the upregulated gldA gene in the glycerolipid metabolism through Chlorophyceae and Chloroflexia/Verrucomicrobiae. Moreover, a close symbiotic relationship between Cyanobacteria and Desulfobacterota I was identified, which played a crucial role in fatty acid decomposition. This study offers new insights into degradation mechanisms of complex organics via microalgal-bacterial symbiosis, which also gains basic knowledge on the carbon cycle in natural water ecosystems mediated by microalgal-bacterial symbiosis.
Sign in to start a discussion.
More Papers Like This
Biological Approaches Integrating Algae and Bacteria for the Degradation of Wastewater Contaminants—A Review
This review examined integrated algae-bacteria approaches for wastewater treatment, highlighting how these biological systems can degrade organic contaminants more sustainably than conventional methods while producing less sludge and requiring less energy.
Algal–Bacterial Symbiotic Granular Sludge Technology in Wastewater Treatment: A Review on Advances and Future Prospects
This review examines algal-bacterial granular sludge technology for wastewater treatment, which achieves over 90% organic matter removal and can adsorb microplastics and heavy metals. The technology reduces aeration energy consumption by 30-50% compared to conventional systems through microalgal oxygen production, and machine learning models enable real-time optimization of treatment performance.
Adaptation responses of microalgal-bacterial granular sludge to polystyrene microplastic particles in municipal wastewater
Researchers found that polystyrene microplastics of varying sizes did not significantly impair organic, ammonia, or phosphorus removal in microalgal-bacterial granular sludge systems treating municipal wastewater, though the microplastics did alter microbial community composition.
Sequential use of Microalgae and Constructed Wetlands and its potential to remove organic load, toxicity and pharmaceuticals from urban wastewaters
This study evaluated the performance of a sequential microalgae and constructed wetland treatment system for removing organic load, pharmaceuticals, and toxicity from urban wastewater, finding that the integrated approach achieved higher removal rates than either technology alone.
Revealing the influencing mechanisms of polystyrene microplastics (MPs) on the performance and stability of the algal-bacterial granular sludge
Researchers investigated how polystyrene microplastics affect algal-bacterial granular sludge used in wastewater treatment, finding that the sludge removed over 96% of incoming microplastics but that microplastics inhibited COD removal by 2.6 to 4.1% and total phosphorus removal by 2.9 to 5.8%. Structural stability was compromised through oxidative stress, altered protein composition, and reduced abundance of key functional bacteria.