Treatment of cod analysis liquid wastes generated in environmental laboratories

COD analysis is often carried out in environmental labs. Its wastes are considered hazardous due to the content of metals such as Cr, Ag and Hg; treating these wastes is considered complex and expensive. The experimental results of metal ion precipitation in COD wastes with affordable chemical products are reported in this work. Cr (VI) was chemically reduced by adding 200 mg.L-1 of glucose to Cr (III). Final Cr (VI) concentration was less than 0.5 mg.L-1. Cr (III) was precipitated as a metallic hydroxide by adding NaOH and Ag was reduced to less than 0.2 mg.L-1 by adding 2 g.L-1 of NaCl. Hg was reduced to less than 0.005 mg.L-1 with 10 g.L-1 of FeS. The proposed reduction-precipitation methodology allowed minimising the liquid residue’s hazardous characteristics so that it complied with the maximum allowable values established in Chapter 6, Article 74 of Decree 1594/1984 that regulates the use of water and liquid residues.

• Autores: Mañunga, Tatiana; Gutiérrez, Héctor Mario; Rodríguez Victoria, Jenny Alexandra; Villarreal Díaz, Alexander
• Tipo de recurso: Article of journal
• Fecha de publicación: 2010
• Institución: Universidad Nacional de Colombia
• Repositorio: Universidad Nacional de Colombia
• Idioma: spa
• OAI Identifier: oai:repositorio.unal.edu.co:unal/29654
• Acceso en línea: https://repositorio.unal.edu.co/handle/unal/29654; http://bdigital.unal.edu.co/19702/; http://bdigital.unal.edu.co/19702/2/; http://bdigital.unal.edu.co/19702/3/
• Palabra clave: Ingeniería Ambiental; Ingeniería Sanitaria; DQO; tratamiento fisicoquímico; metales pesados; precipitación; reducción; Sanitary Engineering; Enviromental Engineering; parallel; control; ternary system; column; reactor
• Rights: openAccess
• License: Atribución-NoComercial 4.0 Internacional