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Related Experiment Videos

Waste lime as a potential cation source in the phosphate crystallization process.

Y H Ahn1, R E Speece

  • 1School of Civil Environmental and Engineering, Yeungnam University, 214-1 Daedong Gyungsan, 712-749 Korea.

Environmental Technology
|January 6, 2007
PubMed
Summary
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Waste lime effectively aids phosphate crystallization, enabling significant nutrient recovery in sludge treatment. This sustainable approach offers economic benefits and reduces nutrient recycling loads in industrial waste management.

Area of Science:

  • Environmental Engineering
  • Materials Science
  • Chemical Engineering

Background:

  • Industrial waste lime presents a potential resource for nutrient recovery.
  • Phosphate crystallization is crucial for wastewater treatment and resource management.
  • Sludge treatment processes require efficient methods for nutrient removal and resource valorization.

Purpose of the Study:

  • To investigate the feasibility of using waste lime as a cation source in phosphate crystallization.
  • To evaluate the application of waste lime in a novel sludge treatment process involving fermentation and crystallization.
  • To determine the optimal conditions for nutrient removal and struvite precipitation using waste lime.

Main Methods:

  • Laboratory-scale up-flow reactors with sequencing batch configuration were employed.

Related Experiment Videos

  • A two-stage process involving a high-performance fermenter and a crystallization reactor was utilized.
  • Nutrient removal efficiency, optimal dosages, and crystal morphology were analyzed using synthetic wastewater and fermentation effluent.

    • Main Results:

    • Considerable nutrient removal (approx. 60%) was achieved within 0.5-1 hour using synthetic wastewater.
    • Optimal waste lime dosage was 0.3 g/L, yielding 80% NH4-N and 41% PO3-P removal in 3 hours.
    • Waste lime addition resulted in amorphous crystals, while magnesium salt produced prism-like struvite crystals.

    Conclusions:

    • Waste lime is a viable and economical cation source for phosphate crystallization and nutrient recovery.
    • The proposed sludge treatment process effectively reduces nutrient recycle loading in large-scale applications.
    • Reusing industrial waste lime offers significant economic advantages and promotes sustainable industrial waste treatment.