| Author: | Jiang, Jie |
| Title: | Optimizing the operating conditions for a combined partial nitrification and anammox system to treat domestic wastewater |
| Advisors: | Li, Xiang-dong (CEE) |
| Degree: | M.Sc. |
| Year: | 2020 |
| Subject: | Sewage -- Purification Sewage disposal plants -- Management Hong Kong Polytechnic University -- Dissertations |
| Department: | Department of Civil and Environmental Engineering |
| Pages: | ix, 58 pages : color illustrations |
| Language: | English |
| Abstract: | The discharge of domestic wastewater causes severe environmental problems such as eutrophication in pollutant-receiving water bodies and contamination of drinking water sources. In a long time, the sewage treatment works in Hong Kong applied the nitrification and denitrification, which are classified as conventional bio-treatment technologies, to remove nitrogen components. However, this tertiary treatment consumes a large amount of energy for oxygen supply through an aeration process and extra carbon sources. The process of partial nitrification/Anammox (PN/A) overcomes the shortcomings of nitrification and denitrification due to the anaerobic and autotrophic properties of anammox bacteria, which can reduce 60% of energy consumption and 90% of sludge production. To apply this new technology to the mainstream of the municipal wastewater treatment plant in Hong Kong, a two-step continuous flow reactor was designed and used in this laboratory experiment for achieving optimal nitrogen removal performance of the PN/A process. This experiment simulated two concentrations of influent NH4⁺-N, and NO2⁻-N which was 100 mg/L and 50 mg/L. For the PN reactor, 42.6 mg/L of the accumulation of NO2-N and 89.8% of ammonium removal rate were achieved. For the anammox reactor, the removal rate was 0.15 kg N/m3/d and the removal efficiency reached 68.5% respectively. The addition of COD indeed promoted the proliferation of denitrifying bacteria and affected the activity of AOB and anammox bacteria. Through genomic sequencing of bacteria community, the specific functional bacteria groups were pointed out that Nitrosomonas, which accounted for 26%, and Nitrospira, which occupied for 14%, were the main functional bacteria groups for nitrification in the PN reactor and Candidatus Kuenenuia, the abundance of was 54%, was the major contributor to nitrogen removal in the anammox reactor. |
| Rights: | All rights reserved |
| Access: | restricted access |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| 5368.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.08 MB | Adobe PDF | View/Open |
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