Recirculation in a full scale rotating biological contactor for nitrogen removal

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dc.contributor.advisorCartmell, Elise
dc.contributor.authorChan, Kwok Leung
dc.date.accessioned2024-03-06T09:41:23Z
dc.date.available2024-03-06T09:41:23Z
dc.date.issued2009-09
dc.description.abstractThe effect of an internal recirculation on the total nitrogen removal efficiency in a full scale Rotating Biological Contactor (RBC). The study consists of two trials using two RBC units in parallel, with one acting as a control and the other with a recycle system installed. Trial 1 was to recycle nitrate rich effluent from the humus tank back to the septic tank at the front of the unit, where denitrification occurs using the raw wastewater as a carbon source. TN removal had improved from 25% to 74% when the recycle ratio (R) was increased from 0 to 2. There is no noticeable effect on BOD5 concentration in the effluent as R increases, maintaining a steady 96% removal rate. The effluent had shown a slight increase in turbidity as R increase. Trial 2 was to recycle from the biozone to the septic tank. An overall reduction in removal efficiencies in the test unit have shown that recycling directly from the biozone could not achieve a better performance. Recycling from the biozone had also induced simultaneous nitrification and denitrification in the septic tank, resulting in a 50% reduction in BOD5 and TN prior entering the biozone.en_UK
dc.description.sponsorshipEngineering and Physical Sciences (EPSRC)en_UK
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/20929
dc.language.isoenen_UK
dc.publisherCranfield Universityen_UK
dc.publisher.departmentSASen_UK
dc.subjectinternal recirculationen_UK
dc.subjectnitrate rich effluenten_UK
dc.subjectrecycle systemen_UK
dc.subjectdenitrificationen_UK
dc.subjectbiozoneen_UK
dc.subjectremoval efficienciesen_UK
dc.titleRecirculation in a full scale rotating biological contactor for nitrogen removalen_UK
dc.typeThesis or dissertationen_UK
dc.type.qualificationlevelMastersen_UK
dc.type.qualificationnameMScen_UK

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