I. Introduction
Reverse osmosis is a process of purifying water by using semi-permeable membranes as a filter under osmotic pressure. Osmotic pressure can be defined as a force which moves the water molecules from the higher concentration region to lower concentration region (Kim et al. 2018). Water demand and water scarcity in our country makes it mandatory to treat and reuse the wastewater, so, the water issues could be solved by recycling the used water [1]. Reverse Osmosis wastewater treatment plants can be applied in domestic wastewater treatment due to its compact size and in industrial wastewater treatment due to the metal ion removal property of the system [?], [10].