Affiliations: School of Municipal and Environmental Engineering,
Harbin Institute of Technology, Harbin 150090, China | Key Lab of Water Quality Science and Water Environment
Recovery Engineering, Beijing University of Technology, Beijing 100022,
China
Abstract: Anaerobic ammonium oxidation (ANAMMOX) is a recently developed
process to treat ammonia-rich wastewater. There were numerous articles about
the new technology with focus on the ammonium-rich wastewater treatment, but
few on advanced municipal wastewater treatment. The paper studied the anaerobic
ammonium oxidation (ANAMMOX) process with a down flow anoxic biofilter for
nitrogen removal from secondary clarifier effluent of municipal wastewater with
low COD/N ratio. The results showed that ANAMMOX process is applicable to
advanced wastewater treatment with normal temperature as well as ammonia-rich
high temperature wastewater treatment. The results indicated that ammonia
removal rate was improved by raising the nitrite concentration, and the
reaction rate reached a climax at 118.4 mgN/L of the nitrite nitrogen
concentration. If the concentration exceeds 118.4 mgN/L, the ANAMMOX process
was significantly inhibited although the ANAMMOX bacteria still showed a
relatively high reactivity. The data also indicated that the ratio of
NO_2^--N:NH_4^+-N=1.3:1 in the influent
was appropriate for excellent nitrogen removal. The pH increased gradually
along the ANAMMOX biofilter reactor. When the ANAMMOX reaction was ended, the
pH was tend to calm. The data suggested that the pH could be used as an
indicator to describe the course of ANAMMOX reaction.
