Date of Award
2008
Degree Type
Thesis
Degree Name
Master of Engineering Science
Program
Civil and Environmental Engineering
Supervisor
Dr. George Nakhla
Second Advisor
Dr. Jesse Zhu
Abstract
The performance of a Liquid-Solid Circulating Fluidized Bed (LSCFB) Bioreactor for treatment of wastewater with anoxic and aerobic beds and lava rock as biofilm carrier media was used to investigate the impact of the carbon to nitrogen (COD∕N) ratio on the process performance, with particular focus on total nitrogen removal. Three different municipal wastewaters with COD/N ratios of 10:1, 6:1 and 4:1 were tested at an empty bed contact time of 0.82 h. It was found that 90% of influent organic matter was removed throughout the study with 58% removal in the anoxic column at COD/N ratio of 4:1. Total nitrogen removal efficiencies at COD/N ratios of 10:1 to 4:1 were 91%, 82% and 71% and simultaneous nitrification-denitrification (SND) occurred in the aerobic downer. Furthermore, the achievability of sewer discharge criteria during the treatment of rendering wastewater, characterized by COD of 29,509± 438 mg L^1, BODs of 20,161 ± 673 mg L', TKN of 1,087± 21 mg L^1 and NH4-N of 605 ± 6.2 mg L^1, was carried out. More than 90% of influent organic matter, 79-96% nitrogen was removed during treatment of rendering wastewater. Biofilm thicknesses were monitored throughout the study period. Average biofilm thickness of <100 and 750 μm were observed in the downer and riser, respectively.
Recommended Citation
Islam, Mohammad N., "TREATMENT OF WASTEWATER BY A LIQUID-SOLID CIRCULATING FLUIDIZED BED BIOREACTOR: BIOLOGICAL NUTRIENT REMOVAL" (2008). Digitized Theses. 4427.
https://ir.lib.uwo.ca/digitizedtheses/4427