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A novel starch and calcium silicate hydrate cryogel (Cry-CSH) effectively removes phosphate from water in a continuous flow system. This green adsorbent shows high efficiency, especially with increased adsorbent height, for wastewater treatment.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Phosphate removal from water is crucial for preventing eutrophication.
  • Conventional methods face challenges in efficiency and environmental impact.
  • Development of sustainable and practical adsorbents is needed.

Purpose of the Study:

  • To develop and evaluate a monolithic cryogel adsorbent (Cry-CSH) for continuous phosphate removal.
  • To investigate the effects of operational parameters on adsorption efficiency in a flow system.
  • To assess the performance of Cry-CSH in real wastewater effluent.

Main Methods:

  • A novel monolithic cryogel adsorbent (Cry-CSH) composed of starch and calcium silicate hydrate was synthesized.
  • Phosphate adsorption was studied in a continuous flow column system.
  • The influence of flow rate, initial phosphate concentration, and adsorbent height was investigated.
  • Adsorption data was modeled using Adams-Bohart, Thomas, and Yoon-Nelson models.
  • The Cry-CSH system was tested on real wastewater effluent from a treatment plant.

Main Results:

  • The Cry-CSH adsorbent demonstrated effective phosphate removal in a continuous flow system.
  • Adsorption efficiency decreased with increased flow rate and initial phosphate concentration.
  • Increased adsorbent height significantly enhanced column performance.
  • The Adams-Bohart model best described the initial adsorption kinetics.
  • The system achieved 94.61% phosphate removal from municipal wastewater effluent.

Conclusions:

  • The monolithic Cry-CSH cryogel is a practical and green adsorbent for continuous phosphate removal.
  • Adsorbent height is a key factor in optimizing column performance.
  • The Cry-CSH system shows high potential for treating real wastewater and mitigating eutrophication.