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Energy saving and rapid establishment of granular microalgae system from tiny microalgae cells: Effect of decrease in

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Summary

Reducing upflow air velocity and using intermittent aeration for microalgae granules (MGs) in wastewater treatment slightly delays formation but boosts chlorophyll-a content and nutrient removal efficiency, cutting costs.

Keywords:
Energy efficiencyMicroalgae biogranulationNutrients removalSettleabilityUpflow air velocity

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Area of Science:

  • Environmental Science
  • Biotechnology
  • Chemical Engineering

Background:

  • Microalgae granules (MGs) offer potential for wastewater nutrient remediation and resource recovery.
  • A significant challenge for MGs is their long start-up time and associated labor costs.

Purpose of the Study:

  • To investigate an operational strategy using reduced upflow air velocity (UAV) and intermittent aeration for MGs formation and maintenance.
  • To compare this strategy with a higher UAV mode regarding MGs characteristics, nutrient removal, and energy consumption.

Main Methods:

  • Two experimental setups were used: R_A with reduced UAV (0.49 cm/s) and intermittent aeration, and R_B with higher UAV (0.98 cm/s).
  • MGs formation time, chlorophyll-a content, carbon, nitrogen, and phosphorus removal efficiencies, and energy consumption were monitored and compared.

Main Results:

  • MGs formation in R_A was delayed by 12 days compared to R_B.
  • MGs in R_A exhibited a 40.78% increase in chlorophyll-a content.
  • R_A demonstrated more cost-effective removal of carbon, nitrogen, and phosphorus with reduced energy consumption.

Conclusions:

  • Reduced UAV and intermittent aeration can be an effective strategy for MGs operation in wastewater treatment.
  • This approach enhances microalgae assimilation, improves nutrient removal, and significantly reduces energy input.
  • The findings offer insights into sustainable wastewater management through optimized MG system operation.