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Bioavailability of Dissolved Organic Nitrogen in Treated Effluents
- Article from:
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Water Environment Research
- Article date:
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May 1, 2008
- Author:
- Urgun-Demirtas, Meltem; Sattayatewa, Chakkrid; Pagilla, Krishna R
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Copyright informationCopyright Water Environment Federation May 2008. Provided by ProQuest LLC. (Hide copyright information)
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ABSTRACT:
The research objective was to assess dissolved organic nitrogen (DON) bioavailability in wastewater effluents from a pilot-scale nitrification plant and a laboratory-scale total nitrogen (TN) removal plant. The DON bioavailability was assessed using a 14-day bioassay protocol containing bacterial and algal inocula. Nitrogen species, dissolved organic carbon, chlorophyll a, and biomass (as total suspended solids and culturable cell counts) concentrations were measured to assess DON bioavailability. The results showed an increase in algal chlorophyll a concentration, with a concurrent increase in algal biomass over time; increased bacterial counts and a decrease in DON concentration ...