Industrial and sanitary wastewater treatment plants, which are used for the reuse and recycling of industrial and sanitary effluents in industrial and agricultural water supply, are among the important and practical technologies applied in resource management. These treatment plants can be equipped with a variety of facilities, such as physical and biological treatment tanks, MBR, DAF, UF and RO, depending on the analysis of the incoming effluent and its type. Because of the concentration of some industries in the country’s central and eastern regions, as well as the scarcity of water resources in those areas, the supply of water required by industries from wastewater is critical. In this regard, complementary wastewater treatment plants are designed, supplied, installed and commissioned based on the type and analysis of industrial and sanitary effluents available in each region as well as the water required by those industries.