Abstract
Although UASB systems treating municipal wastewater generally remove fecal coliform (FC)by ~ one order of magnitude, the effl uent still contains concentrations higher than the WHOstandard for unrestricted irrigation. In this study, the effect of continuous diffused aerationon the removal of FC was examined. The diffused aeration system was operated at differenthydraulic retention times (60, 30 and 15 min) and dissolved oxygen (DO) concentrations (5-6and 1-2 mg/l). The removal of FC was affected by the applied HRT and DO. Optimum resultswere obtained at HRT and DO equal to 60 min and 5-6 mg/l respectively, with FC removal ofapproximately 2 log (97%). The mechanisms responsible for FC die-off were the pH and oxidationreduction potential (ORP) of the medium.
Original language | English |
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Pages (from-to) | 41-44 |
Number of pages | 4 |
Journal | Desalination and Water Treatment |
Volume | 39 |
Issue number | 1-3 |
DOIs | |
State | Published - Feb 2012 |
Externally published | Yes |
Keywords
- Diffused aeration
- Dissolved oxygen
- Fecal coliform removal
- Municipal wastewater
- ORP
- UASB