ALTERNATIVES FOR THE GALVANIC WASTEWATER TREATMENT

作者：Pereira Neto Artur; Bretz Joana de Souza; Magalhaes Fernando Silva; Mansur Marcelo Borges; Ferreira Rocha Sonia Denise

来源：Engenharia Sanitaria e Ambiental, 2008, 13(3): 263-270.

DOI：10.1590/S1413-41522008000300004

• Galvanic industry
• effluents treatment
• separation of zinc and iron
• precipitation
• crystallization
• liquid-liquid extraction

Separation methods such as chemical precipitation, crystallization and liquid-liquid extraction have been investigated aiming to treat effluents generated by the galvanic industry. Effluent samples generated by several companies located in the state of Minas Gerais (Brazil) were collected and chemically characterized. For this work, a typical zinc hot-dip galvanizing effluent containing about 90 g/L of total iron, 35 g/L of zinc and minor amounts of Al, Ni, Cu, in HCl medium (pH = 0.6) was treated. A selective separation between metals zinc and iron was not achieved by chemical precipitation, which was found adequate to threat water only. On contrary, zinc and iron was separated very efficiently by crystallization and liquid-liquid extraction using TBP as extractant agent. The integration of these methods to recover zinc and iron from effluent still requires more detailed studies.

• 出版日期2008-9