The use of aeration to enhance ammonia nitrogen removal in constructed wetlands

Jamieson, T.S., Stratton, G.W., Gordon, R. and Madani, A. 2003. The use of aeration to enhance ammonia nitrogen removal in constructed wetlands. Canadian Biosystems Engineering/Le genie des biosystemes au Canada 45: 1.9-1.14. Nitrogen (N) resulting from manure run-off can impair receiving water bodies. Constructed wetlands are engineered systems built to utilize the treatment processes available in natural wetlands in a controlled and predictable manner. Nitrification is often limited in constructed wetlands treating agricultural wastewater due to the predominantly anaerobic conditions within the wetland. A greenhouse wetland model was constructed to assess the effects of aeration on ammonia-N removal. The system achieved a mean 50% ammonia-N removal efficiency prior to the introduction of an aquatic aeration system. After the commencement of continual aeration in the first cell of the system, ammonia-N removal efficiencies increased to a mean of 93%, parallelled by nitrate-N increases. This indicated that the addition of continual aeration has great potential to enhance nitrification in constructed wetlands receiving agricultural wastewater.

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