TH. HAMAD AL-TAI, A.; W. FATHEL AL-TAK, M. Performance Study of Concentrated Circular Channels System (Orbal) for Removing Nutrients from Domestic Wastewater. Al-Rafidain Engineering Journal (AREJ), [S. l.], v. 24, n. 2, p. 65–73, 2019. DOI: 10.33899/rengj.2019.164328. Disponível em: https://ojs.uomosul.edu.iq/index.php/arej/article/view/27247. Acesso em: 8 aug. 2025.