Ammonia gas treatment in low cost biological reactor

B. Lew, A. Meir, A. A. Khan, M. A. Khan, S. Tarre, M. Green

Research output: Contribution to journalArticlepeer-review


Ammonia gas contributes to a number of environmental and human health concerns. The use of chalk, a cheap alkalinity source may reduce costs for biological systems. This research studies a closed liquid flow reactor to treat ammonia gas using chalk as biomass media and alkalinity source with high value calcium nitrate fertilizer production. The proposed reactor showed complete ammonia gas removal at high rate (500 mg N/L/day) and with low cost; where chalk dissolution and ammonia gas absorption contributed to alkalinity in the water for nitrification. High calcium ion concentration (up to 10,000 mg Ca2+ as CaCO3/L) showed only minor effects on ammonia absorption and nitrification rate.

Original languageEnglish
Article number129949
JournalBioresource Technology
StatePublished - Jan 2024


  • Ammonia alkalinity
  • Chalk alkalinity
  • Gas treatment
  • Nitrification at low pH


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