SciELO - Scientific Electronic Library Online

vol.30 issue2Developing and integrating a computer-based AM/FM radio stationLocal quantification and characterisation represents a basic tool for integrated residential solid waste management author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand



Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google


Ingeniería e Investigación

Print version ISSN 0120-5609


MANUNGA, Tatiana; GUTIERREZ, Héctor Mario; RODRIGUEZ VICTORIA, Jenny Alexandra  and  VILLARREAL DIAZ, Alexander. Treatment of COD analysis liquid wastes generated in environmental laboratories . Ing. Investig. [online]. 2010, vol.30, n.2, pp.87-95. ISSN 0120-5609.

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 reductionprecipitation 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.

Keywords : parallel; control; ternary system; column; reactor.

        · abstract in Spanish     · text in English | Spanish     · Spanish ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License