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Related Experiment Videos

Floc structural characteristics using conventional coagulation for a high doc, low alkalinity surface water source.

Peter Jarvis1, Bruce Jefferson, Simon A Parsons

  • 1School of Water Sciences, Building 39, Cranfield University, Cranfield, Bedford, MK40 0AL, UK.

Water Research
|June 13, 2006
PubMed
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This study investigated how natural organic matter (NOM) and polymers affect floc structure during water treatment. Adding polymers to ferric sulfate and polyDADMAC flocs reduced size but did not significantly improve regrowth after breakage.

Area of Science:

  • Environmental Science
  • Water Treatment Technologies
  • Colloid and Surface Chemistry

Background:

  • Natural organic matter (NOM) removal is crucial in water purification.
  • Metal salt coagulants and flocculant aids are standard for enhancing solid removal.
  • Understanding floc structure impacts treatment efficiency.

Purpose of the Study:

  • To investigate the influence of NOM and polymer addition on floc structure.
  • To compare physical characteristics of flocs formed under different conditions.
  • To analyze floc size, breakage, regrowth, and settling behavior.

Main Methods:

  • Utilized a ferric sulfate coagulant and a high molecular weight cationic polydiallyldimethylammonium chloride (polyDADMAC) polymer.
  • Compared coagulant precipitate flocs, organic-coagulant flocs, and organic-coagulant-polymer flocs.

Related Experiment Videos

  • Measured floc size, breakage, re-growth, and settling characteristics at optimal doses.

    • Main Results:

    • Precipitate flocs were larger and settled better than NOM-coagulant flocs.
    • Polymer addition further reduced floc size and compaction.
    • Polymers decreased the rate of floc degradation but minimally improved post-breakage regrowth.

    Conclusions:

    • Floc characteristics are significantly altered by the presence of NOM and polymers.
    • Polymer use in coagulation can modify floc properties, impacting settling and stability.
    • While polymers offer some benefits in floc degradation resistance, overall regrowth potential remains limited.