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Changes in Microcystis aeruginosa cell integrity and variation in microcystin-LR and proteins during Tanfloc

Jun Hou1, Zijun Yang1, Peifang Wang1

  • 1Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.

The Science of the Total Environment
|January 23, 2018
PubMed

Insights

Tanfloc effectively removes intact Microcystis aeruginosa cells, protecting them during initial floc storage. This process delays toxin release, aiding in harmful algal bloom management and reducing secondary pollution risks.

Area of Science:

  • Environmental Science
  • Water Treatment
  • Microbiology

Background:

  • Harmful algal blooms (HABs) caused by cyanobacteria like Microcystis aeruginosa pose significant environmental and health risks.
  • Microcystin-LR (MC-LR) is a potent toxin released during algal cell lysis, contaminating water sources.
  • Effective removal and management of algal biomass are crucial for mitigating HAB impacts.

Purpose of the Study:

  • To evaluate the impact of Tanfloc on Microcystis aeruginosa cell integrity, MC-LR, and protein release during flocculation and storage.
  • To determine optimal flocculation conditions using Tanfloc to minimize cell damage and toxin release.
  • To assess the protective effect of Tanfloc on algal cells and toxins during floc storage.

Main Methods:

  • Response surface methodology (RSM) was employed to optimize Tanfloc dosage, rapid agitation, and slow agitation parameters.
  • Microcystis aeruginosa cell integrity, MC-LR, and protein concentrations were monitored under various flocculation and storage conditions.
  • Algal cell removal efficiency and lysis rates were quantified.

Main Results:

  • Optimal flocculation conditions achieved up to 98.9% intact Microcystis aeruginosa cell removal with a low Tanfloc dosage.
  • Tanfloc initially protected algal cells from lysis during floc storage.
  • A delay in extracellular MC-LR and protein release was observed for up to 8 days due to Tanfloc's presence.

Conclusions:

  • Tanfloc is effective in removing intact Microcystis aeruginosa cells and delaying the release of MC-LR and proteins.
  • The extended delay in toxin release provides a critical window for sludge decontamination, reducing secondary pollution risks.
  • The cost-effectiveness of Tanfloc supports its potential for widespread application in managing harmful algal blooms.
Keywords:
Algal organic matterBioploymerCentral composite designHarmful algal bloomsSecondary pollution

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