Studies on immobilized cells of ammonium oxidizingacteria for partial nitrification process
Date Issued
2009
Date
2009
Author(s)
Houa, Yuan-De
Abstract
Traditional denitrification technology was widely used in sewage treatment plants with low ammonia nitrogen concentration and high carbon source. The removal of ammonia nitrogen revealed low efficiency in treating wastewater with high ammonia nitrogen concentration and low C/N ratio. The advantage of ammonia nitrogen nitritation was low energy-source consumed, low carbon-source supplied and the reduced reaction time. Immobilization provided substratum that microorganisms attached on it and improved the resistance of environmental loading. Ammonia nitrogen nitritation and immobilization are both the priority of wastewater treatment. his study applied the advantages of nitritation and immobilization to analyze the reaction of nitrite. The ammonia-oxidizing bacteria were immobilized to investigate the degradation of ammonia nitrogen and the production rate of nitrite nitrogen. The reactor experiments introduced suspended populations and immobilization of ammonia-oxidizing bacteria to carry out ammonia nitrogen nitritation. The temperature was controlled at 35℃, pH was maintained from 7.8 to 8.0, the concentration was arranged from 600 to 1000 mg/L, and the DO concentration was 0.5, 1.0, 2.0, 3.0, 4.0, 5.0 mg/L. The objective of the research was to observe the variations of NH3-N, NO2-N, and NO3-N with reaction time. Furthermore, this study analyzed the reaction kinetics of ammonia oxidation from ammonia degradation rate with different concentration. rom the results of the experiments, it revealed that the immobilization of ammonia-oxidizing bacteria was not influenced by DO concentration in ammonia nitrogen nitritation and the production rate of NO2-N can be regulated by DO concentration. This technology provides flexibility when removing ammonia nitrogen in wastewater and it react tally with Michaelis-Menten kinetics.
Subjects
immobilized bacteria
ammonia nitrogen nitritation
dissolved oxygen
Michaelis-Menten kinetics
Type
thesis
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