Anammox-based Technologies for Sustainable Mainstream Wastewater Treatment: Process Development, Microbial Ecology and Mathematical Modeling
| dc.contributor.author | Li, Xiaojin | en |
| dc.contributor.committeechair | He, Zhen | en |
| dc.contributor.committeemember | Bott, Charles B. | en |
| dc.contributor.committeemember | Boardman, Gregory D. | en |
| dc.contributor.committeemember | Wang, Zhiwu | en |
| dc.contributor.department | Civil and Environmental Engineering | en |
| dc.date.accessioned | 2019-08-31T06:00:24Z | en |
| dc.date.available | 2019-08-31T06:00:24Z | en |
| dc.date.issued | 2018-03-08 | en |
| dc.description.abstract | The nitritation-anammox process is an efficient and cost-effective approach for biological nitrogen removal, but its application in treating mainstream wastewater remains a great challenge. The key objectives of this dissertation are to develop nitritation-anammox process to treat wastewater with low-nitrogen strength, understand the fundamental microbiology, and optimize its operation through experimental studies and mathematic modeling. Chapter 2 showed that the nitritation-anammox process has been successfully developed in an upflow membrane-aerated biofilm reactor, where pure oxygen was delivered via gas-permeable membrane module. Chapter 3 demonstrated that hybrid anaerobic reactor (HAR) could be an effective pretreatment method to provide a relatively low COD/N ratio for nitritation-anammox reactor. In Chapter 4, a novel mathematical model has been proposed to evaluate the minimum DO requirement for the nitritation-anammox reactor to achieve the maximum TN removal under various COD/N scenarios (controlled by HRTHAR). Chapters 5 and 6 designed an OsAMX system by linking nitritation-anammox to forward osmosis to remove the reverse-fluxed ammonium while using ammonium bicarbonate as a draw solute. The microbial community structures and dynamics, spatial distributions in these bioreactors were characterized by high-throughput sequencing and fluorescent in situ hybridization techniques. The studies in this dissertation have demonstrated that nitritation-anammox process is a promising alternative for sustainable mainstream treatment with the appropriate pretreatment approach and operation optimization. | en |
| dc.description.degree | PHD | en |
| dc.format.medium | ETD | en |
| dc.identifier.other | vt_gsexam:14359 | en |
| dc.identifier.uri | http://hdl.handle.net/10919/93328 | en |
| dc.publisher | Virginia Tech | en |
| dc.rights | In Copyright | en |
| dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
| dc.subject | Mainstream nitritation-anammox | en |
| dc.subject | anaerobic pretreatment | en |
| dc.subject | granule | en |
| dc.subject | COD/N ratio | en |
| dc.subject | microbial community | en |
| dc.subject | model simulation | en |
| dc.subject | forward osmosis | en |
| dc.title | Anammox-based Technologies for Sustainable Mainstream Wastewater Treatment: Process Development, Microbial Ecology and Mathematical Modeling | en |
| dc.type | Dissertation | en |
| thesis.degree.discipline | Civil Engineering | en |
| thesis.degree.grantor | Virginia Polytechnic Institute and State University | en |
| thesis.degree.level | doctoral | en |
| thesis.degree.name | PHD | en |