Decolourisation of textile indigo dye by DC electric current

✍ Scribed by M.A. Sanromán; M. Pazos; M.T. Ricart; C. Cameselle

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 412 KB
• Volume: 77
• Category: Article
• ISSN: 0013-7952
• DOI: 10.1016/j.enggeo.2004.07.016

✦ Synopsis

The electrochemical technology has been employed for the treatment of soils and liquid medium contaminated with aromatic pollutants as indigo textile dye. In liquid medium, 76% of colour removal was obtained in 87 h, and the addition of NaCl (10 g/ l) reduced the treatment time up to 45 min. In soils, two alternative methods were developed: a direct electrochemical treatment and the extraction of dye from the soil followed by electrochemical decolourisation of the liquid collected. In the latter process, 50% ethanol in water solution was selected as the best extracting agent. This extracting solution (indigo concentration of 0.5 g/l) was further decolourised electrochemically in the presence of NaCl (10g/l) for 24 h, ending in a colour removal of 70%. Using the direct electrochemical treatment, a regular decolourisation profile along the whole cell was attained. The decolourisation degree was 76% and was reached after 16 days of treatment and an electric power consumption of 61 Wd h.