Th. Hamad Al-Tai, A., & W. Fathel Al-Tak, M. (2019). Performance Study of Concentrated Circular Channels System (Orbal) for Removing Nutrients from Domestic Wastewater. Al-Rafidain Engineering Journal (AREJ), 24(2), 65–73. https://doi.org/10.33899/rengj.2019.164328