Thesis
Biological removal of nitrogen from dairy wastewater via Alcaligenes faecalis strain no. 4
Washington State University
Master of Science (MS), Washington State University
2018
Handle:
https://hdl.handle.net/2376/102387
Abstract
Alcaligenes faecalis strain No. 4 is a heterotrophic aerobic microorganism with the ability of converting ammonium nitrogen to both dinitrogen gas (N2) and microbial biomass, indicating the strain's high potential in the bio-removal of ammonia from wastewater. This research tested the performance of strain No.4, in the removal of total ammoniacal nitrogen (TAN), from dairy wastewater under different factors affecting its treatment efficiency, including: temperature, carbon-to-nitrogen (C/N) ratio, oxygen supplementation, and initial ammonia concentration in the dairy wastewater. Based on the results of these studies, the following was the optimal combination of these factors, for treatment of dairy wastewater: temperature of 30°C; carbon-to-nitrogen ratio of 5; initial total ammonia concentration of 800 mg/L; and pure oxygen supplementation for 20 min at a constant rate of 0.2 L min-1 every 4 h. Under optimal oxygen supply with pure oxygen and flush times of 20 min at a constant rate of 0.2 L min-1 every 4 h, the TAN removal efficiency was nearly 100%. On the other hand, with optimal air supply at flush times of 20 min at a constant rate of 0.2 L min-1 every 4 h, the peak TAN removal efficiency was approximately 80%.
Metrics
21 File views/ downloads
87 Record Views
Details
- Title
- Biological removal of nitrogen from dairy wastewater via Alcaligenes faecalis strain no. 4
- Creators
- Xiaoyun Xue
- Contributors
- Pius Ndegwa (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Biological Systems Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525095601842
- Language
- English
- Resource Type
- Thesis