Membrane and Water Treatment

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The effect of organic matter on the removal of phosphorus through precipitation as struvite and calcium phosphate in synthetic dairy wastewater

  • Aleta, Prince (Department of Environmental Systems Engineering, Korea University) ;
  • Parikh, Sanjai J. (Department of Land, Air and Water Resources, University of California) ;
  • Silchuk, Amy P. (Department of Land, Air and Water Resources, University of California) ;
  • Scow, Kate M. (Department of Land, Air and Water Resources, University of California) ;
  • Park, Minseung (Department of Environmental Systems Engineering, Korea University) ;
  • Kim, Sungpyo (Department of Environmental Systems Engineering, Korea University)
  • Received : 2017.10.12
  • Accepted : 2018.04.26
  • Published : 2018.05.25
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Abstract

This study investigated the effect of organic matter on the precipitation of struvite and calcium phosphate for phosphorus recovery from synthetic dairy wastewater. Batch precipitation experiments were performed to precipitate phosphorus from solutions containing $PO_4{^{3-}}$ and $NH_4{^+}$ by the addition of $Mg^{2+}$ and $Ca^{2+}$, separately, at varying pH, Mg/P and Ca/P molar ratios, and organic matter concentrations. Soluble total organic solids exhibited more inhibition to precipitation due to potential interaction with other dissolved ionic species involved in phosphorus precipitation. Xylan with low total acidity only exhibited significant inhibition at very high concentrations in synthetic wastewater (at up to 100 g/L). No significant inhibition was observed for Mg and Ca precipitation at relatively lower concentrations (at up to 1.2 g/L). MINTEQ simulations show that dissolved organic matter (DOM) as humic substances (HS) can cause significant inhibition even at relatively low concentrations of 0.165 g/L fulvic acid. However, scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis suggested that xylan altered the crystal structure of both precipitates and had caused the formation of smaller sized struvite crystals with slightly rougher surfaces This could be due to xylan molecules adhering on the surface of the crystal potentially blocking active sites and limit further crystal growth. Smaller particle sizes will have negative practical impact because of poorer settleability.

Keywords

Acknowledgement

Grant : Waste to Energy and Recycling Human Resource Development Project

Supported by : Korean Ministry of Environment (MOE)

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