Effect of Continuous and Intermittent Aeration Modes on the Efficiency of the Continuous Flow Extended Aeration Activated Sludge Systems
| Autor: | Kossay K. Al-Ahmady, Ammar A. Al-Sultan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Engineering and Technology Journal, Vol 32, Iss 13, Pp 498-512 (2014) |
| Druh dokumentu: | article |
| ISSN: | 1681-6900 2412-0758 |
| DOI: | 10.30684/etj.32.13A.24 |
| Popis: | In this research an experimental plant was constructed and operated in order to study the efficiency of the intermittent aeration activated sludge system that operated at the ratio of (On/Off aeration times) (15min/15min), (30min/30min), (60min/60min), (90min/90min) and (120min/120min) and compare their performance with the continuous flow extended aeration activated sludge. The results of the study revealed that; extended aeration reactor is more efficient in removing organic matter than the intermittent aeration reactors. At the hydraulic detention times of (24, 18 and 32), 100%, 65% and 100% of effluent readings had organic concentration less than the acceptable effluent level in compare to 75%, 60% and 80% at the (90min/90min) reactor. In comparison of On/Off aeration times, (90min/90min) reactors provide the best organic removal. All readings from the extended aeration and (15min/15min), (60min/60min), and (90min/90min) reactors were within the acceptable level for effluent suspended solids while the effluent concentrations from the (120min/120min) reactors were higher. The results also indicated that, intermittent aeration reactors are better in removing phosphorous than the extended aeration. At the detention times of 24 and 18 hours, 8% and 6% of readings from the extended aeration reactors had (PO4 ≤ 5 mg/l) in compare to 90% and 52% of readings from the (60min/60min) reactor. At detention time of 32 hours, 32% of readings from the extended aeration reactor had (PO4 ≤ 2 mg/l) in compare to 72% for the (60min/60min) reactor. Higher phosphorus removals were recorded at (60min/60min) reactors. |
| Databáze: | Directory of Open Access Journals |
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