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A collaborative effect of solid-phase denitrification and algae on secondary effluent purification.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Biotechnology

Background:

  • Investigating bacteria-algae symbiosis for nutrient removal is crucial for wastewater treatment.
  • Biodegradable carriers influence the efficiency of symbiotic systems.
  • Understanding microbial community dynamics is key to optimizing these systems.

Purpose of the Study:

  • To explore the synergistic effects of biodegradable carriers and algae on nutrient removal.
  • To analyze the impact on microbial community structure in a solid-phase denitrification system.
  • To identify optimal carrier materials and algae species for enhanced nutrient removal.

Main Methods:

  • Utilized three biodegradable carriers: apple wood, poplar wood, and corncob.
  • Incorporated two algae species: Chlorella vulgaris and Chlorella pyrenoidosa.
  • Employed metagenomics sequencing to analyze microbial community composition.

Main Results:

  • Corncob demonstrated superior removal efficiencies for total nitrogen (83.7%-85.1%) and phosphorus (38.1%-49.1%).
  • Algae addition promoted nutrient removal, with significant phosphorus removal enhancement (3%-11%) observed with corncob.
  • Microbial analysis revealed shifts in dominant phyla, with Chlorobi dominating corncob reactors with algae, unlike wood reactors.

Conclusions:

  • Corncob's high organic availability supports robust bacteria-algae symbiosis for nutrient removal.
  • Algae integration enhances system performance, particularly with nutrient-rich carriers like corncob.
  • Biodegradable carriers and algae co-selection significantly impacts microbial community structure and function.