IMPACT OF THE VELOCITY ON THE FATE OF POLLUTANTS IN GABAL EL-ASFAR DRAIN | ||||
| Journal of Al-Azhar University Engineering Sector | ||||
| Volume 19, Issue 72, July 2024, Page 173-188 PDF (739.18 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/auej.2024.260215.1581 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Mostafa El-sayed Hassanien   1; Usama Fathy Mohamed2; Emad Soliman Elmolla3; Ahmed Abdallah Ahmed4; Abdelhamed Abdelhak Khater4
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| 1Dept. of Civil Engineering, Faculty of Engineering, Al-Azhar University, Cairo, Egypt | ||||
| 2Dept. of Civil Engineering, Faculty of Engineering, Al-Azhar University, Cairo, Egypt | ||||
| 3Dept. of Civil Engineering, Faculty of Engineering, Al-Azhar University, Cairo, Egypt | ||||
| 4National Water Research Center, Ministry of water resources and irrigation, Egypt | ||||
| Abstract | ||||
| Gabal El-Asfar drain (GAD) receives a secondary treated sewage effluent from Gabal El-Asfar wastewater treatment plant (GAWWTP). The design capacity of GAWWTP is 2.5 million m3/d. The drain receives also agriculture drainage water from agriculture sub drain. The drain length is about 7.7 km starts from the GAWWTP and discharge in Belbeis drain. This study focused in the first 7 km of the GAD. The objective of this study is to develop a hydrodynamic model for GAD and simulate the fate of residual pollutants from GAWWTP and subdrains to study the effect of velocity variation within the drain channel GAD using a water quality module. Delft3D-FLOW software was used firstly to develop the hydrodynamic model of the drain based on the historical geometric and hydraulic data. hereafter, Delft3D-WAQ was used to simulate the fate of residual pollutants in terms of Biochemical, chemical, etc. based on water quality measurements that were conducted from February to May 2023 in the field. The calibrated model was used to study the impact of the drain velocity on GAD water quality. Many scenarios have been conducted assuming that the capacity of GAWWTP is varied from 1 to 3.5 million m3/ day, which these capacity refer to longitudinal velocity in GAD from 0.3 to 0.8 m/s. The results showed that as the velocity in the drain increased, the removal rate of BOD5, COD and TSS were decreased. The reduction of BOD5, COD and TSS were 33.56, 3.12 and 71.30 % respectively for scenario 1 where the velocity is 0.3 m/s, While the reduction of BOD5, COD and TSS was 12.29, 1.31 and 23.81 % respectively for scenario 6 where the velocity is 0.8 m/s. Special Issue of AEIC 2024 (Civil Engineering Session) | ||||
| Keywords | ||||
| hydrodynamic model; water quality model; calibrated model; Delft3D-FLOW; Delft3D-WAQ; fate | ||||
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