Quality Assessment and Potential Reuse of Treated Wastewater by Activated Sludge (Sana'a city, Yemen) : Physico-Chemical Study

The Sana'a Basin is located in central highlands of Yemen. This basin is characterized by water crisis due to arid climate with low rainfall (170 mm/year), and drawdown of piezometric levels. Promoting water reuse of treated wastewater for irrigation could mitigate this water crisis. This study assesses the performance of Wastewater Treatment Plant (WWTP) by activated sludge of Sana'a City by analyzing the quality raw and treated wastewater predominantly by domestic sewage. A comparison with Yemen and international guideline reveals the results of pH, EC and PO4 show that the effluent from SWWTP are in admissible standard limit for irrigation. But, the others parameters such as BOD, COD, NH4, TSS, phenols and heavy metals are very high than the standard values due to the overloaded of SWWTP. The added of facultative ponds can improve the performance of this station. Therefore, the quality of final effluent will be better