TRATAMIENTO BIOLÓGICO DE AGUAS RESIDUALES DE LA INDUSTRIA TEXTIL

WOLSKI E. A.; CERETTA MARÍA BELÉN; DURRUTY, I.; GONZALEZ J.F.

Córdoba

Congreso; VI Congreso Internacional Sobre Gestión y Tratamiento Integral del Agua; 2016

Fac. Cs Agropecuarias UNC, Univ. Blas Pascal, Aguas Cordobesas y Fundación PRODTI

Textile-dyeingindustries generate effluents which are among the most difficult to treat dueto its toxicity, intense coloration, high pH and high salinity. Thebiodegradation appears as a low-impact and economical treatment alternative incomparison to traditional physico-chemical methods. In this work, we evaluatedthe capacity of a microbial consortium, isolated from a dyeing facility, todegrade the effluent from batches in which the azo-dye Direct Black 22 (DB22) wasbeing used. The effluent, either alone or supplemented with glucose and starch,was inoculated with the consortium and it was incubated at 28°C for 96h withoutagitation. The consortium showed a high capacity to decolorize the effluent:without an additional carbon source: the percentage of decolorization was 77.6± 3.0 %, with an initial rate of 3.2 ± 0.7 mg.L-1.h-1;while the supplemented with glucose showed a decolorization rate 4 times higher(13.1 ± 1.1 mg.L-1.h-1), and a higher decolorizationpercentage (87.2 ± 2.5 %). For the effluent supplemented with starch, thevalues obtained were similar to those obtained without an additional carbonsource. In all cases, after the biological treatment, the pH dropped about 1 unit,and also a slight decrease in total organic carbon (TOC) and chemical oxygendemand (COD). The conductivity and total phosphorus did not show any variation.We observed a slight increase in the biomass content, thus demonstrating that theconsortium uses DB22 either totally or partially as a carbon source. Theresults obtained motivate the development of innovative biological treatment processesfor textile effluents. Such development is perceived as a key factor tominimize the environmental impact of dyeing facilities and promote an adequateuse of water and its management.