Modeling urea biodegradation in activated sludge using combined respirometric-titrimetric measurements

Article

Hoque, Muhammad Azizul and Aravinthan, Vasantha. 2011. "Modeling urea biodegradation in activated sludge using combined respirometric-titrimetric measurements." Desalination and Water Treatment. 32 (1-3), pp. 115-125. https://doi.org/10.5004/dwt.2011.2686
Article Title

Modeling urea biodegradation in activated sludge using combined respirometric-titrimetric measurements

ERA Journal ID41476
Article CategoryArticle
AuthorsHoque, Muhammad Azizul (Author) and Aravinthan, Vasantha (Author)
Journal TitleDesalination and Water Treatment
Journal Citation32 (1-3), pp. 115-125
Number of Pages11
Year2011
PublisherDesalination Publications
Place of PublicationHopkinton, MA, USA
ISSN1944-3986
1944-3994
Digital Object Identifier (DOI)https://doi.org/10.5004/dwt.2011.2686
Web Address (URL)http://www.deswater.com/abstracts/a_2686.pdf
Abstract

Urea biodegradation kinetics determination has been performed in the literature using a two-step nitrification model that was calibrated using on-line respirometric measurements. However, the model neglected the initial hydrolysis step that converts urea to carbon dioxide and ammonia nitrogen, and assumed constant carbon dioxide transfer rate (CTR), though it is inherently a nonlinear
process which has an impact on the titrimetric modeling. Hence, in this paper, it is aimed to propose a complete two-step nitrification model for urea biodegradation paying attention to urea degradation pathway along with due consideration given for non-linear CTR process occurring
in activated sludge system. Experiments were performed in a simple batch reactor equipped with respirometric and titrimetric set-up. Three different initial urea concentrations were added to the reactor for investigating the process kinetics. Proposed model was successfully calibrated with respirometric, titrimetric and combined respirometric–titrimetric measurements; and the estimated
parameters were compared for model evaluation. Furthermore, the proposed model was validated with off-line ammonium, nitrite and nitrate measurements. The study revealed that urea was hydrolyzed at a faster rate in liquid phase. The maximum growth rates of the Nitrosomonas species and the Nitrobacter species were found to be 0.065–0.1 d–1 and 0.006–0.008 d–1 respectively.

Keywordsoxygen uptake rate (OUR); urea biodegradation; model calibration; nitrification
ANZSRC Field of Research 2020401199. Environmental engineering not elsewhere classified
410303. Bioremediation
400410. Wastewater treatment processes
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Copyright will be retained by authors who may place their papers on their personal or institutional websites.

Byline AffiliationsAustralian Centre for Sustainable Catchments
Institution of OriginUniversity of Southern Queensland
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