Evaluating arsenic and manganese removal from water by chlorine oxidation followed by clarification.

• Autor(a) principal: Pires, Viviane das Graças Rodrigues
• Data de Publicação: 2015
• Outros Autores: Lima, Diego Roberto de Sousa, Aquino, Sergio Francisco de, Libânio, Marcelo
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UFOP
• Texto Completo: http://www.repositorio.ufop.br/handle/123456789/6259; http://dx.doi.org/10.1590/0104-6632.20150322s00003564
• topic: Arsenic; Manganese; Clarification; Oxidation; Water treatment

This paper investigates the simultaneous removal of arsenic [As(V) or As(III)] and manganese [Mn(II)] from natural waters of low and high turbidity by clarification (with polyaluminum chloride and aluminum sulfate as primary coagulants) associated or not with chlorine pre-oxidation. The results showed that the clarification process exhibited low Mn(II) removal, that varied from 6% to 18% and from 19% to 27% for natural waters of low and high turbidity, respectively. The use of chlorine as pre-oxidant increased Mn(II) removal up to 77% and was associated with the formation of birnessite. Regarding As(V) removal by clarification, particularly for high turbidity water, a concentration lower than that established by the National Drinking Water Quality Standards (10 μg.L-1) was achieved in almost all tests. Oxidation preceding the clarification led to AsIII removal efficiencies from 80% to 90% for both coagulants and types of water