Biochemical nitrification was investigated in a large scale pilot study using aged galvanized steel, unlined cast iron and a hybrid pilot distribution systems consisting of a combination of aged polyvinyl chloride, lined cast iron, unlined cast iron and galvanized steel pipes. Variations of free ammonia, nitrate, nitrite, dissolved oxygen (DO) and chloramine residual in the distribution system water are discussed for each pipe material. Chloramine depletion, DO depletion, free ammonia release, heterotrophic plate count (HPC) growth, NO2–N and NOx–N measured as the sum of nitrite and nitrate N were dependent on pipe material. Galvanized steel pipe had the highest chlorine demand and produced conditions without residuals, which corresponded to the higher HPC proliferation and DO consumption and the lowest nitrification. The greatest production of nitrite and nitrate was observed in unlined cast iron pipe. Denitrification was observed in the unlined cast iron pilot distribution system following residual loss and development of anoxic conditions.
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May 2005
This article was originally published in
Journal of Water Supply: Research and Technology-Aqua
Article Contents
Research Article|
May 01 2005
Water quality profiles during nitrification in a pilot distribution system study
Suibing Liu;
Suibing Liu
1Parsons, 3450 Buschwood Park Drive, Ste. 345Tampa, FL 33618, USA
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J. S. Taylor;
2Department of Civil and Environmental Engineering, University of Central Florida, PO Box 162450Orlando, FL 32816-2450, USA
Tel: +1-407-823-2785 Fax: +1-407-823-3315; E-mail: [email protected]
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David Webb
David Webb
2Department of Civil and Environmental Engineering, University of Central Florida, PO Box 162450Orlando, FL 32816-2450, USA
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Journal of Water Supply: Research and Technology-Aqua (2005) 54 (3): 133–145.
Article history
Received:
April 16 2004
Accepted:
October 28 2004
Citation
Suibing Liu, J. S. Taylor, David Webb; Water quality profiles during nitrification in a pilot distribution system study. Journal of Water Supply: Research and Technology-Aqua 1 May 2005; 54 (3): 133–145. doi: https://doi.org/10.2166/aqua.2005.0013
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