Influence of aeration and media fill ratio on submerged aerated filter hydrodynamics and process performance

Research output: Contribution to conferenceAbstractpeer-review

Abstract

Submerged aerated filters (SAFs), are used to meet stringent ammonium (NH4+) and soluble organic consents. Current design follows a black box approach, whereby inlet and outlet contaminant concentrations are monitored, independently of internal hydrodynamic conditions. To investigate the influence of internal hydrodynamic conditions tracer tests were performed on a SAF with biofilm on the media surface, at 100, 75, 50 and 25% media fill ratios. Results indicate that SAF internal hydrodynamic conditions directly influence process performance. A 50% media fill ratio showed optimum hydrodynamic conditions for BOD5 removal, with a removal efficiency of 70% and a mean tracer retention time (¯t), exceeding the hydraulic retention time (HRT) by 68 mins. A 100% media fill ratio showed optimum conditions for NH4+, with a removal efficiency of 60%, but internal shortcutting was evident. The methods used can be applied to diagnose, underperforming SAF reactors and enable optimisation of internal hydrodynamic conditions for selective contaminant removal.
Original languageEnglish
Number of pages5
Publication statusPublished - 30 Jun 2016
Event3rd IWA Specialized International Conference 'Ecotechnologies for Wastewater Treatment' (ecoSTP16) - Cambridge, United Kingdom
Duration: 27 Jun 201630 Jun 2016

Conference

Conference3rd IWA Specialized International Conference 'Ecotechnologies for Wastewater Treatment' (ecoSTP16)
Country/TerritoryUnited Kingdom
CityCambridge
Period27/06/1630/06/16

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