Master of Science in Civil Engineering (MSCE)


Civil and Environmental Engineering

Document Type



Appropriate modeling of Biochemical Oxygen Demand, BOD, is an important part of understanding the character of a wastewater. Much necessary information is gleaned and extracted from the kinetic equation chosen for modeling, especially when a BOD model is included in a dissolved oxygen model. Some information includes the ultimate level of BOD exerted, the rate the BOD demand for dissolved oxygen is exerted, and the critical time at which the minimum level of dissolved oxygen occurs. Although widely used, the first-order kinetic BOD model is not suited for all situations. In some instances, as is the case with constituents found in sugarcane factory effluent, wastewater may be best modeled using half-order kinetics. This study explores the characteristics and applicability of the half-order BOD model. The first part of this study focuses on parameter estimation of the half-order BOD model through the design of an optimal sampling plan. The second and third parts of this study focus on the BOD and dissolved oxygen sag models for a variety of conditions: the half-order BOD reaction by decay alone; the half–order BOD reaction that includes sedimentation or resuspension; and the half-order BOD that includes sedimentation or resuspension and benthic addition of BOD.



Document Availability at the Time of Submission

Release the entire work immediately for access worldwide.

Committee Chair

Donald Dean Adrian