Graduation Year

2005

Document Type

Thesis

Degree

M.S.E.V.

Degree Granting Department

Environmental Engineering

Major Professor

Peter G. Stroot.

Keywords

Ammonium, Nitrate, Nitrifying bacteria, Nitrifiers, Wastewater

Abstract

Wastewater treatment plants (WWTPs) are required to remove ammonium (NH4+) from wastewater due to its oxygen demand and toxicity to the aquatic organisms. Ammonium is removed in the activated sludge treatment system by nitrification and denitrification processes. Nitrification is the oxidation of NH4+ to nitrate (NO3-) by autotrophic nitrifying bacteria which use carbon dioxide (CO2) as a carbon source for growth. These bacteria grow slowly with low nitrification rates limiting WWTPs capacity. In this research it was hypothesized that supplying higher concentrations of CO2 during aeration increases nitrification rates, resulting in a reduction of the solids retention time (SRT).

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