Title page for ETD etd-0612103-153504

Type of Document Master's Thesis
Author Wu, Qiang
Author's Email Address wuqiang@lsu.edu
URN etd-0612103-153504
Title Mathematical Modeling Analysis of Floating Bead Biofilter Application to Domestic Wastewater Treatment
Degree Master of Science in Civil Engineering (M.S.C.E.)
Department Civil & Environmental Engineering
Advisory Committee
Advisor Name Title
Ronald F Malone Committee Chair
Donald Dean Adrian Committee Member
John J Sansalone Committee Member
  • wastewater treatment
  • biofilter
  • mathematical modeling
Date of Defense 2003-05-05
Availability unrestricted
Floating Bead Biofilters (FBFs) have been applied to aquacultural recirculating tanks and domestic wastewater treatment systems for controlling total ammonia nitrogen (TAN), biochemical oxygen demand (BOD), and total suspended solids (TSS). Support modified media in these FBFs provide a large surface area (1150~1475 m2/m3) so that the active biofilm can be retained in the FBF by attaching to the media surface. Understanding the theories involved in biofilm processes greatly helps in sizing, designing, and modeling of FBF systems. Fundamental biofilm processes like mass transport of various substrates into the biofilm and the substrate utilization within the biofilm were studied.

A mathematical model (MSB Model) was set up to predict the development of the FBFs characteristics such as biofilm growth, substrates utilization, dissolved oxygen consumption, BOD loading removal, volumetric oxygen consumption rate by filter (OCF), and bead bed volume under the different conditions. This model was then calibrated with a set of bioclarification data. The model results were consistent with literature defining the relationships between dissolved oxygen consumption, BOD loading removal, and biofilm growth. This model is specifically used to predict design parameters for FBFs in a municipal sewage treatment systems. The entire study was based on the following experimental parameters: OCF, dissolved oxygen (DO), hydraulic loading, BOD loading, maximum ratio of BOD removal to OCF (MX-factor).

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