Ammonia stripping as a pretreatment for landfill leachate

K. C. Cheung, L. M. Chu*, Ming Hung WONG

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

155 Citations (Scopus)


The effectiveness of ammonia stripping at different air flow rates (0, 1 and 5 L min- 1) and lime dosages (0 and 10000 mg L-1 calcium hydroxide) was investigated in aeration tanks in a laboratory as a pretreatment to remove ammoniacal-nitrogen and organic load (COD) in landfill leachate. Ammoniacal-nitrogen removal at 20°C after one day was 70% for 0 L min-1, 81% for 1 L min-1 and 90% for 5 L min-1 regardless of the origin of leachate. Ammonia loss was mainly due to desorption through water surface. The levels of phosphorus and COD were only reduced by lime precipitation, with 85% and 93% phosphorus removal and 24% and 47% COD removed for leachate from the Junk Bay Landfill (JB) and Gin Drinkers' Bay Landfill (GDB) respectively. The highly significant difference (P < 0.05) of COD removal between JB and GDB might be due to the different age of the two landfills studied. Leachate quality and configuration of the treatment reactor were important factors affecting the efficiency of ammonia removal by stripping processes.

Original languageEnglish
Pages (from-to)209-220
Number of pages12
JournalWater, Air, and Soil Pollution
Issue number1-2
Publication statusPublished - 1997

Scopus Subject Areas

  • Environmental Engineering
  • Environmental Chemistry
  • Ecological Modelling
  • Water Science and Technology
  • Pollution

User-Defined Keywords

  • ammonia stripping
  • landfill leachate
  • lime
  • pretreatment


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