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Phosphate removal from digested sludge supernatant using modified fly ash.

Ke Xu1, Tong Deng, Juntan Liu

  • 1Department of Civil Engineering and Construction Engineering, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China. xuke72@126.com

Water Environment Research : a Research Publication of the Water Environment Federation
|August 3, 2012
PubMed
Summary

Modified coal fly ash effectively removes phosphate from wastewater. Sulfuric acid treatment enhances adsorption, achieving 98.62% removal in under 5 minutes at optimal pH 9.

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Area of Science:

  • Environmental Science
  • Water Treatment Technologies
  • Materials Science

Background:

  • Phosphate discharge into aquatic ecosystems causes eutrophication.
  • Digested sludge supernatant is a significant source of phosphate pollution.
  • Effective phosphate removal methods are crucial for environmental protection.

Purpose of the Study:

  • To investigate the efficacy of modified coal fly ash for phosphate removal.
  • To determine the optimal conditions for phosphate adsorption.
  • To elucidate the mechanism of phosphate immobilization.

Main Methods:

  • Modification of coal fly ash using sulfuric acid.
  • Batch adsorption experiments to study phosphate removal.
  • Analysis of adsorption kinetics, pH, adsorbent dosage, and temperature effects.
  • X-ray diffraction and scanning electron microscopy for material characterization.

Main Results:

  • Sulfuric acid modification significantly enhanced phosphate immobilization.
  • Phosphate removal reached equilibrium of 98.62% within 5 minutes.
  • Optimal conditions included pH 9 and increased adsorbent dosage.
  • Temperature (20-40°C) had minimal impact on removal efficiency.
  • Phosphate precipitated with Ca, Al, and Fe ions.

Conclusions:

  • Modified coal fly ash is a highly efficient adsorbent for phosphate removal from digested sludge supernatant.
  • The rapid adsorption kinetics and high removal efficiency make it a promising sustainable solution.
  • The immobilization mechanism involves the formation of amorphous precipitates with metal ions.