Date of Award

Spring 2014

Degree Type


Degree Name

Master of Science (MS)


Civil Engineering

First Advisor

Ernest R. Blatchley III

Committee Member 1

Loring F. Nies

Committee Member 2

Ronald F. Turco


Attached-growth biological treatment systems have potential to conduct nitrification in cold-temperature climates. In this research, in order to simulate the attached-growth nitrification process (using BOBBER biological reactor) at a real wastewater treatment facility, two laboratory-scale mini-BOBBER systems were installed in a temperature-controlled room and were operated for 101 days with pure ammonium chloride feed solution. Steady-state conditions were approached at 20°C, 15°C, 10°C, and 5°C. In addition, a series of batch experiments were conducted at temperatures of 20°C and 5°C to investigate the relationship between nitrification rate and ammonia-N concentration. Results from these experiments were analyzed and compared with the water quality data from the full-scale lagoon system at Wingate. Collectively, it is possible to maintain effective biochemical nitrification in attached-growth systems under cold-weather conditions. Satisfactory performance of these systems will depend on hydraulic design and loading rates of the systems.