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Pressurized Microcystis can help to remove nitrate from eutrophic water.

Yingying Huang1, Xuechu Chen1, Panpan Li1

  • 1Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Dong Chuan Road 500, Shanghai 200241, PR China.

Bioresource Technology
|July 18, 2017
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Summary

Pressurization of harmful Microcystis cyanobacteria enhances nitrate removal in eutrophic waters. This method converts Microcystis into a viable carbon source, boosting the sediment-water interface

Keywords:
Harmful cyanobacterial controlMicrocystisNitrate removalPressurizationSediment-water interface

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Area of Science:

  • Environmental Microbiology
  • Water Quality Management
  • Cyanobacteria Research

Background:

  • Eutrophic waters suffer from high nitrate levels, harming aquatic ecosystems.
  • Harmful cyanobacteria like Microcystis proliferate in these conditions.
  • Effective nitrate removal strategies are crucial for water remediation.

Purpose of the Study:

  • To assess the feasibility of using Microcystis for nitrate removal.
  • To investigate the impact of pressurization on Microcystis viability and function.
  • To explore Microcystis as a carbon source for denitrification.

Main Methods:

  • Treatment of Microcystis with pressurization at 0.4MPa.
  • Assessment of Microcystis viability under dark/anoxic conditions over three days.
  • Measurement of dissolved organic carbon (DOC) secretion.
  • Quantification of nitrate (NOX--N) removal rates at the sediment-water interface.

Main Results:

  • Pressurization caused Microcystis to rapidly sediment.
  • Microcystis maintained high viability for three days post-pressurization.
  • Living Microcystis secreted significant amounts of DOC (2.48mgCmg-1 Chl a).
  • A 2.85-fold increase in specific nitrate removal rate was observed.

Conclusions:

  • Pressurization is a feasible method to utilize Microcystis for water remediation.
  • Pressurized Microcystis can serve as an effective carbon source for nitrate removal.
  • This approach offers a novel strategy for managing harmful cyanobacteria and improving water quality.