Respirometric Evaluation of Side-Stream Treatment of Reject Water As a Source of Nitrifying Bacteria for Main-Stream Activated Sludge Bioreactors.
A laboratory-scale bioreactor study was conducted to characterize differences in nitrification function in main-stream reactors due to bioaugmentation from side-stream reactors treating reject water. The objective was to evaluate how configuration of a suspended growth side-stream bioreactor impacts nitrification function in the main-stream bioreactor. A bioaugmentation effect was not observed in main-stream reactors operated at warm temperatures. Complete oxidation of ammonia to nitrate was observed in the bioaugmented and control main-stream reactors although nitrite accumulation was observed in each case. Furthermore, respirometry did not reveal superior kinetics in bioaugmented reactors operated at warm temperatures. At cold temperatures bioaugmentation may have stabilized ammonia oxidation in main-stream reactor B2 bioaugmented from a PFR side-stream. Complete ammonia oxidation was observed for most of cold period of operation in the main-stream bioreactor B2. Furthermore, respirometry revealed a higher rate of ammonia oxidation and more stable nitrite oxidation compared with the control bioreactor.
R. C. Smith and D. B. Oerther, "Respirometric Evaluation of Side-Stream Treatment of Reject Water As a Source of Nitrifying Bacteria for Main-Stream Activated Sludge Bioreactors.," Water Science and Technology : A Journal of the International Association on Water Pollution Research, vol. 60, no. 10, pp. 2677-2684, IWA Publishing, Nov 2009.
The definitive version is available at http://dx.doi.org/10.2166/wst.2009.621
Civil, Architectural and Environmental Engineering
Keywords and Phrases
nitrite; bacterium; bioreactor; chemistry; metabolism; methodology; microbiology; oxygen consumption; sewage; time; water management; water pollutant; Bacteria; Bioreactors; Nitrites; Oxygen Consumption; Sewage; Time Factors; Waste Disposal, Fluid; Water Microbiology; Water Pollutants, Chemical; Water Purification
International Standard Serial Number (ISSN)
Article - Journal
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