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Related Experiment Videos

Agglomeration of struvite crystals.

Kristell S Le Corre1, Eugenia Valsami-Jones, Phil Hobbs

  • 1School of Water Sciences, Cranfield University, Cranfield MK43 OAL, UK.

Water Research
|December 5, 2006
PubMed
Summary
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Struvite crystallization can remove phosphorus from wastewater but forms fines. This study explored using coagulants and flocculants to agglomerate struvite particles, finding polyDADMAC effective but pH-sensitive.

Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Materials Science

Background:

  • Struvite crystallization is a key process for phosphorus removal from wastewater.
  • It also recovers phosphorus as a fertilizer, but fines formation poses challenges in pilot/full-scale operations.
  • These fines can hinder downstream processes and product quality.

Purpose of the Study:

  • To investigate the agglomerative properties of struvite particles.
  • To evaluate the efficacy of coagulants and flocculants in removing struvite fines.
  • To identify optimal chemical treatments for improving struvite product quality.

Main Methods:

  • Tested various coagulants: aluminum (Al3+), iron (Fe3+) salts, calcium compounds, and polydiallyldimethylammoniumchloride (polyDADMAC).

Related Experiment Videos

  • Assessed the impact of a natural flocculant, alginate.
  • Investigated particle destabilization and agglomeration mechanisms.
  • Optimized polyDADMAC dosage under varying pH conditions.

    • Main Results:

    • Chemical addition effectively destabilized struvite particles.
    • Polydiallyldimethylammoniumchloride (polyDADMAC) showed promise for struvite particle agglomeration.
    • Optimal polyDADMAC dosage was found to be highly sensitive to pH conditions typical for struvite formation.

    Conclusions:

    • Chemical treatment is a feasible strategy to manage struvite fines.
    • PolyDADMAC is a potential coagulant for struvite agglomeration.
    • Careful pH control is crucial for effective polyDADMAC application in struvite recovery processes.