Model Based Optimization of Nitrogen Removal in a Full Scale Activated Sludge Plant

İnsel H. G., GOERGUEN E., Artan N., ORHON D.

ENVIRONMENTAL ENGINEERING SCIENCE, vol.26, no.3, pp.471-480, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 26 Issue: 3
  • Publication Date: 2009
  • Doi Number: 10.1089/ees.2007.0272
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.471-480
  • Keywords: leather tanning, process optimization, nitrogen removal, intermittent aeration, process control, modeling, TANNERY WASTE-WATER, SIMULTANEOUS NITRIFICATION, WASTEWATERS, PERFORMANCE, AERATION, SYSTEMS, DENITRIFICATION, TEMPERATURE, CALIBRATION, KINETICS
  • Istanbul Technical University Affiliated: Yes


This paper evaluates model-based upgrading of an activated sludge plant treating wastewaters of leather tanning industrial district with an average capacity of 13,000 m(3)/d. Significant impact of temperature changes on biochemical processes, such as nitrification and denitrification were quantified and used in setting the aeration control for process optimization in terms of total nitrogen removal. Model evaluation based upon kinetic and stoichiometric parameters specifically determined for the tannery wastewater, indicated that an intermittent aeration type of an operation strategy was suitable for achieving the required effluent total nitrogen level of 100 mgN/L under all operating conditions at the process temperature range of 21 degrees C-35 degrees C. The simulation study also showed that the nitrification performance of the plant was improved by increasing the aeration intensity. The application of intermittent aeration provided a competitive advantage in meeting the total nitrogen standards, improving the total nitrogen removal to around 60%.