Recovery of nitrogen and phosphorus from synthetic wastewater through crystallization process


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Recovery of nitrogen and phosphorus from synthetic wastewater through crystallization process

Mohamad Amran Mohd Salleh1,*, Nur Masturah Abdul Razak1, Md. Mukhlesur Rahman2, Suraya Abdul Rashid1

HIGHLIGHTS

  • Nitrogen and phosphorus are the key elements for eutrophication.
  • Crystallization is an excellent way of nutrient recovery from wastewater.
  • Struvite and its derivatives (MgNH2PO3.7H2O) can be used as a fertilizer.
  • Struvite crystallization simultaneously recovers valuable products from wastewater.
  • This study can help to reduce the risk of water pollution.

ABSTRACT

High amount of nitrogen (N) and phosphorus (P) in wastewater is hazardous to aquatic environment as it triggers the eutrophication. Hence, the removal of N and P from wastewater is an important issue to save the water environment. The aim of this study was to recover the N and P from synthetic wastewater through crystallization process. Recovery of ammonium and phosphate through crystallization at different operational conditions were observed. Parameters studied were pH, reaction time and stirrer speed. Removal efficiency of NH4+ and PO43- were related to the level of pH. The highest removal of NH4+ and PO43- (85% and 47%, respectively) were observed at pH 9.5 with the 1:1:1 molar ratio of PO4:Mg:NH4. Moreover, stirring speed showed minor effects on the crystal production. Nonetheless, the crystal production was the same at different time periods. The morphology of the crystal was studied through scanning electron microscopy (SEM) and the X-ray diffraction (XRD) pattern and it was proved that the precipitated crystals were derivatives of struvite, called magnesium amide phosphate hydrate (MgNH2PO3.7H2O). Hence, the formation of struvite crystal derivatives from wastewater might be an effective way to remove and recover ammonium and phosphate from wastewater and thus, able to reduce water and environmental pollution. Therefore, valuable crystal fertilizers can be recovered from wastewaters of livestock farms, municipal sewage or industries. It also can minimize nutrient loading and improve water quality significantly.

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To cite this article: Salleh MAM, Razak NMA, Rahman MM, Rashid SA. Recovery of nitrogen and phosphorus from synthetic wastewater through crystallization process. Journal of Desalination and Water Purification 2016;3:11-16.

To link this article: http://ababilpub.com/download/jdwp3-3/