Decolorization, Cytotoxicity, and Genotoxicity Reduction During a Combined Ozonation/Fungal Treatment of Dye-Contaminated Wastewater

Abstract

In view of compliance with increasingly stringent environmental legislation imposed by regional, national, and supranational (e.g., European Union) authorities, innovative environmental technologies for the treatment of dye-contaminated effluents are necessary in the color industry. In this study, effluents of an industrial dye producer were subjected to distinct treatment trains following an initial qualitative characterization. The effectiveness of ozonation and a treatment using white rot fungi (WRF) and their enzymes were compared with respect to parameters such as residual color, toxicity on human cells, and genotoxicity. A combined ozonation/WRF process was also investigated. The effluent exhibited significant toxicity that was reduced by only 10% through ozonation, whereas the fungal treatment achieved a 35% reduction. A combined treatment (ozone/WRF) caused an abatement of the toxicity by more than 70%. In addition, the initial genotoxicity of the effluent was still present after the ozone treatment, while it was completely removed through the fungal treatment.

Integrated fungal biomass and activated sludge treatment for textile wastewaters bioremediation

“…ozonation, photochemical processes). These additional methods, however, are very expensive and not always solve the problem of toxicity (Vanhulle et al, 2008).…”

Scale-up of a bioprocess for textile wastewater treatment using Bjerkandera adusta

“…Actually, textile effluents are one of the most difficultto-treat wastewaters on account of the considerable amount of suspended solids and of the massive presence of dyes, salts, additives, detergents and surfactants. They exhibit large fluctuations in terms of quantities and pollution load, pH and temperature depending upon customer orders, types of manufactured textile materials and production schedules (Hai et al, 2007 andVanhulle et al, 2008).…”

Active carbon preparation from treads of tire waste for dye removal in waste water

“…Photooxidation is an excellent technology to oxidize organics, however its efficiency is conditioned to the light penetration in waste water and, organic dyes strongly absorb light in the ultraviolet and visible region of spectrum. 13 In this way, the previous dye removal improves the penetration of light in waste water and the efficiency of the photooxidation process.…”