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Algal flocculation with synthetic organic polyelectrolytes.

M W Tenney, W F Echelberger, R G Schuessler

    Applied Microbiology
    |December 1, 1969
    PubMed
    Summary
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    Cationic polyelectrolytes effectively remove algae from water via chemical flocculation. This method utilizes polymer bridging to form aggregates, aiding in water and wastewater treatment.

    Area of Science:

    • Environmental Science
    • Chemical Engineering
    • Water Treatment

    Background:

    • Algal blooms pose challenges in water and wastewater systems.
    • Chemical flocculation is a potential method for algal removal.

    Purpose of the Study:

    • To investigate the feasibility of chemical flocculation for removing algae.
    • To identify effective polyelectrolyte types for algal flocculation.

    Main Methods:

    • Utilized mixed algal cultures from laboratory reactors.
    • Tested cationic, anionic, and nonionic synthetic organic polyelectrolytes as flocculants.
    • Analyzed the mechanism of flocculation and factors influencing it.

    Main Results:

    • Cationic polyelectrolytes induced significant algal flocculation.

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  • Anionic and nonionic polymers did not effectively flocculate algae.
  • Flocculation depends on polymer coverage and reduced algal surface charge for bridging.

    • Conclusions:

    • Chemical flocculation with cationic polyelectrolytes is a viable method for algal removal.
    • The bridging mechanism is key to forming settleable algal flocs.
    • Optimizing polyelectrolyte dose requires considering pH, algal concentration, and growth phase.