|Title:||Simultaneous partial nitrification, anammox and denitrification (SNAD) and simultaneous partial nitrification and denitrification (SND) treating landfill leachates|
|Subject:||Hong Kong Polytechnic University -- Dissertations|
Sewage -- Purification
Sewage -- Purification -- Nitrogen removal
|Department:||Faculty of Construction and Environment|
|Pages:||43 pages : color illustrations|
|Abstract:||Partial nitrification and ANNAMOX at low Dissolved Oxygen level are new methods investigated on nitrogen removal of landfill leachate that contain high concentration of ammonium and low carbon to nitrogen ratio. The partial nitrification and ANNAMOX save more energy, and higher efficiency removal of total nitrogen and COD in contrast to traditional nitrification-denitrification treatment. In addition, the sludge retention time and settle time are faster than that of conventional biological method. In the project, SNAD SBRs are applied to treat raw and dilute (after air stripping) landfill leachates, respectively in order to investigate the efficiency of organic carbon and ammonium removal. The treatments are easily affected by parameters: pH, temperature, COD concentration and Dissolved Oxygen concentration. If either one of the parameters could not provide favourable condition to partial nitrification and ANNAMOX, full nitrification would perform and ANNAMOX would stop processing. In addition, denitrification was inhibited to process. Although the partial nitrification could not processing at the first month operation, the energy consumed by the set-up still less than the traditional nitrification-denitrification method, which had similar total nitrogen removal efficiency, 15%. Therefore, the partial nitrification had proved that is beneficial to use on nitrogen removal instead of conventional method. Furthermore, the performance of the reactor gradually processed similar to the hypothesis made after adding ANNAMOX and changing the DO concentration. The nitrate concentration was decreased and nitrite concentration increase as Nitrifying Oxidizing Bacteria started to be inhibited at lower Dissolved Oxygen concentration. In addition, denitrification process might be activated as the Dissolved Oxygen level decreased. Therefore, longer operation is needed for the performances of the reactions become stable.|
Files in This Item:
|991021952833403411.pdf||For All Users (off-campus access for PolyU Staff & Students only)||1.4 MB||Adobe PDF||View/Open|
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item: