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Ammonia removal from compost leachate using zeolite. II. A study using continuous flow packed columns.

C H Liu1, K V Lo

  • 1Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, Canada.

Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
|October 16, 2001
PubMed
Summary

Zeolite effectively removes ammonium from compost leachate. Longer hydraulic retention times and powdered zeolite significantly enhance ammonia adsorption capacity, achieving over 98% removal.

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Area of Science:

  • Environmental Science
  • Water Treatment Engineering
  • Adsorption Technology

Background:

  • Compost leachate poses environmental challenges due to high ammonium content.
  • Effective treatment methods are crucial for sustainable waste management.
  • Ammonium removal from wastewater is a significant environmental concern.

Purpose of the Study:

  • To investigate the continuous removal of ammonium ions from compost leachate using packed zeolite columns.
  • To evaluate the impact of hydraulic retention time (HRT) and zeolite particle size on ammonia adsorption.
  • To determine the operational capacity and efficiency of zeolite for leachate treatment.

Main Methods:

  • Bench-scale packed zeolite columns were operated under continuous flow conditions.

Related Experiment Videos

  • Experiments varied hydraulic retention time (HRT) and zeolite particle size (coarse vs. powdered).
  • Ammonia removal efficiency and adsorption capacity were quantified over multiple bed volumes (BV).

    • Main Results:

    • Higher ammonia removal efficiencies were observed with longer HRT (lower flow rates).
    • Powdered zeolite demonstrated approximately 20% higher removal efficiency than coarse zeolite at equivalent HRT.
    • An HRT of 6 hours yielded efficient ammonia removal with an operating capacity of 1.31 mg N/g zeolite.
    • Over 98% ammonia removal was sustained for more than 5 BV of compost leachate.

    Conclusions:

    • Zeolite is a highly effective medium for continuous ammonium removal from compost leachate.
    • Optimizing HRT and utilizing powdered zeolite enhances treatment performance.
    • Zeolite columns offer a promising solution for treating nitrogen-rich wastewater from composting operations.