“…In the last decades, the biological treatment methods of wastewater have attracted the researchers' attention, due to their simplicity, low contamination and cost, and high function in wastewater treatment (Goswami et al, 2018). The biological treatment methods are considered the alternative techniques of the physical and chemical methods which suffered from several disadvantages (Carboneras et al, 2018). Various biological methods have shown high performance in treating domestic wastewater, including the employment of polymer materials (polyaluminium chloride (PAC)), utilization of the microorganisms (bacteria, fungi, and algae), and the purification methods by the plant roots (wetland plants) (Sandoval et al, 2019).…”