QUALITY OF SECONDARY WASTEWATER TREATMENT AT ZENIEN WASTE WATER TREATMENT PLANT | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 13, Volume 34, Issue 5, May 2009, Page 5659-5670 PDF (1.1 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2009.93122 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| S. M. Ahmed1; G. A. M. El-sayed1; R. M. Abdrabu2 | ||||
| 1Soils, Water and Environment Res. Inst. ARC, Giza, Egypt | ||||
| 2Zenien Wastewater treatment plant, Giza, Egypt | ||||
| Abstract | ||||
| Zenien waste water treatment plant (wwtp) consists of flow measurement device, screens, pre-aeration unit, primary sedimentation tanks, grit chamber, activated sludge tanks which were supported with diffused aeration system, final sedimentation tanks, and chlorine contact chamber. Firstly, the wastewater passes through screen for large objects removal and is pre-aerated in pre-aerated unit, which is operated at retention time of 30 min., for oil and grease separation. The plant is operated at retention time of 2 h in the primary sedimentation tank, while the activated unit is operated at retention of 4 h. The secondary sedimentation tank is performed at retention time of 2 h and thirty min. The plant was designed for receiving a wastewater flow rate of 330,000 m3/d. The aim of this research is to evaluate the potential efficiencies of a secondary WWTP under Egyptian conditions in comparison with Egyptian code of wastewater reuse or disposal of to waterways. Results showed that the overall removal percentages of Zenien WWTP in respect to TS and TSS were 31.9 and 95.2%, respectively, meanwhile the overall removal percentages of COD and BOD5 were 91.6 and 95.3 %, respectively. The removal efficiencies of ammonia after the primary and secondary treatment were 27.9 and 48.7 %, respectively. The overall removal percentage of NH4+-N was 63 %. Nitrate showed continual increases after the primary and secondary treatment. The increase percentages were 70 and 133.3 %, respectively. Total and fecal coliforms bacteria were removed at percentages of 99.99% after chlorination. | ||||
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