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Enhanced phosphorus release from waste activated sludge using ascorbic acid reduction and acid dissolution.

Xiaofeng Xu1, Qiuyun Xu2, Zexuan Du1

  • 1Key laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing 400045, China.

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Summary
This summary is machine-generated.

Ascorbic acid (vitamin C) effectively releases phosphorus from wastewater sludge by reducing iron-bound phosphorus and dissolving it in acidic conditions. This sustainable method allows for high phosphorus and iron recovery as vivianite.

Keywords:
Phosphorus, waste activated sludge, ascorbic acidVitamin C reduction, acidity dissolution, vivianite

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Area of Science:

  • Environmental Chemistry
  • Wastewater Treatment Technologies
  • Sustainable Resource Recovery

Background:

  • Iron-derived coagulants are widely used for phosphorus removal in wastewater treatment.
  • This process generates significant iron-phosphorus (Fe-P) species in non-digested sludge.
  • Understanding phosphorus speciation in sludge is crucial for effective sludge management and resource recovery.

Purpose of the Study:

  • To analyze the speciation, distribution, and spatial variation of phosphorus in sludge.
  • To evaluate the efficacy of ascorbic acid (vitamin C) in releasing phosphorus from sludge.
  • To investigate the potential for sustainable phosphorus recovery from sludge.

Main Methods:

  • Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDS) for elemental analysis.
  • Sequential extraction methods to determine phosphorus speciation.
  • Treatment with ascorbic acid (VC) followed by acidic pH adjustment (HCl) to release phosphorus.

Main Results:

  • Inorganic phosphorus constituted 91.3% of total phosphorus, with Fe(III)-P being the dominant fraction (68.5%).
  • Ascorbic acid (VC) effectively released phosphorus, particularly Fe(III)-P, through reduction and subsequent dissolution.
  • A synergistic effect between 120 mmol/L VC and acidity achieved a maximum phosphorus release of 67.1% of total sludge phosphorus.
  • High recovery rates for phosphorus (88%) and Fe2+ (99%) were achieved through vivianite precipitation.

Conclusions:

  • Ascorbic acid offers a sustainable and effective method for releasing phosphorus from wastewater sludge.
  • The combined VC and acidic treatment significantly enhances phosphorus release compared to other methods.
  • This approach enables efficient recovery of phosphorus and iron, promoting a circular economy in wastewater treatment.