Idrica：2023年污水处理厂的数字化转型是实现更可持续未来的关键白皮书（英文版）

Preliminary, or pretreatment, is the first stage of wastewater treatment and is used to prepare water for purification during the following phases. Thus, it consists of removing objects that could damage the plant or the equipment that will be used during the purification process. First, roughing filtration is usually carried out. This process separates out the large and medium-sized solid waste using different thickness screens and sieves. Subsequently, grease and sand particles are removed