This article shows a review of the main physical, chemical, electrochemical, and biological technologies used for heavy metals treatment from wastewater of industrial processes and synthetic aqueous solutions which could be applied to leachates from landfills. This paper submits the generalities, operating principles and modifications made to the technologies described. It is planned to discuss and assess which of these, have better removal rates, as well as higher levels of efficiency in minimizing the heavy metals concentrations such as mercury, chromium, lead, nickel, copper, among others, contained in leachates. It can be pointed out that there is no single treatment, and that each of the technologies reviewed has different heavy metals decontamination rates, the biological ones being the most applied due to their versatility, effectiveness and low costs, compared to chemical and electrochemical technologies.