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Effect of Recycle Ratio and Hydraulic Retention Time on the Performance of Extended Aeration Activated Sludge | ||
| Tikrit Journal of Engineering Sciences | ||
| Article 1, Volume 20, Issue 1, 2013, Pages 15-29 PDF (0 K) | ||
| Abstract | ||
| Three laboratory scale units are designed and constructed in order to perform the present work. These units are capable of working under different hydraulic retention time (HRT) (16-32hrs), recycle ratio (0.25 – 1.5), and temperature (20 -35˚C). The results show that BOD5, COD, NO3-, PO4-3 removal is increased with increasing HRT and recycle ratio under different temperatures. The maximum removal efficiency of COD and BOD5 is 97.16% and 97.99% respectively under 24hrs retention time,1.5 recycle ratio, and 20˚C. However the maximum removal efficiency of NO3- (83%) was obtained under same mentioned condition except temperature which was 35˚C. The maximum removal efficiency of PO4-3 (76.59%) is obtained at 32hrs HRT, 1.25 recycle ratio, and 20˚C. It is obvious from the results of the present work that BOD5, COD, and NO3- removal increased with increasing temperature while; PO4-3 removal is decreased with increasing temperature. | ||
| Keywords | ||
| Recycle ratio; Hydraulic retention time; temperature; Domestic wastewater | ||
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