The metallurgical and mechanical sectors include various industrial activities and production processes. One of them being surface treatment with relevant environmental impact as it produces toxic and carcinogenic effluents. As a result, companies are increasingly investing in physical-chemical effluent treatments in order to remove their toxicity, which contains, among others, heavy metals, chlorides and sulphates. In this processes, solid waste is also generated and had to be treated or reused, according to the legal normative. In this work, a possible optimization of the wastewater treatmen ...