Modeling of the On-Site Gravel Contact Oxidation Process
Date Issued
2011
Date
2011
Author(s)
Lin, Kuan-Yi
Abstract
A model has been developed to describe the BOD biodegradation and nitrification reactions in the gravel media of the gravel contact oxidation treatment unit. First order kinetic and multi-species diffusion equations are used to describe the mechanisms and removal efficiency of BOD and NH3-N. Three gravel contact oxidation treatment sites’ performance was simulated by this model. The average removal efficiencies are 88.5%, 85.0%, 73.7% for BOD, and 93.3%, 58.3%, 72.8% for NH3-N which are slightly lower than observed value. Gravel particle size was identified from this model as the most significant parameter controlling the performance of the process, where BOD removal efficiency increases with the gravel porosity and NH4+ oxidation rate decreases with increase in gravel size. A gravel contact oxidation process for a five people family in a smart eco-community has designed based on the simulation results of the model. It is designed as a series of gravel media component to reduce construction cost and maintenance inconveniences.
Subjects
Constructed Cobble Bed
Natural purification
Cobble Contact Treatment
Biofilm
Type
thesis
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