Use of ozone in a pilot-scale plant for textile wastewater pre-treatment: Physico-chemical efficiency, degradation by-products identification and environmental toxicity of treated wastewater

Effect of basidiomycete fungi on the discoloration and phytotoxicity of synthetic dye and textile effluent

“…When untreated and treated textile effluents were compared, no change in germination rate was observed (Table 2). As shown in Table 1, in some treatments with the dye, after discoloration by fungi, there was a decrease in seed germination, which can be attributed to the production of intermediate metabolites more toxic than the original dye, which makes it necessary to perform of more studies [11].…”

Decolorisation of Textile Dyeing Effluents Using Advanced Oxidation Processes

“…Since the oxidation potential of ozone reportedly decreases from 2.07mV (acidic pH) to 1.4mV (basic pH) (Muthukumanar et al, 2001), it is clear that another more powerful oxidant (HO•) is responsible for the increase in the dye degradation, with a consequent colour absorbance decrease. The efficiency of ozonation in the removal of colourand COD from textile wastewater is important to achieve to discharge limits (Somensia et al, 2010). Textile wastewaters is very complex due to the organic chemicals such as many different dyes, carriers, biocides, bleaching agents, complexion agents, ionic and non-ionic surfactants, sizing agents, etc.…”

“…Textile wastewaters exhibit low BOD to COD ratios (< 0.1) indicating non-biodegradable nature of dyes and Wilmott et al(1998) have claimed that aerobic biological degradation is not always effective for textile dye contaminated effluent (Sevimli & Sarikaya, 2002). Somensia et al, (2010) , tested pilot scale ozonation for the pre-treatment and colour removal of real textile effluent. Authors have mentioned that the importance of pH on the process efficiency and colour removal efficiencies were determined as 40.6% and 67.5% at pH 3.0 and 9.1, respectively.…”

Ozone Catalytic Oxidation of Gaseous Toluene over MnO2-Based Ozone Decomposition Catalysts Immobilized on a Nonwoven Fabric

“…Ozone (O 3 ) is a very strong oxidant and has attracted great interest for degrading organic pollutants, such as dyes (Wu et al, 2008a;Cuiping et al, 2009;Srinivasan et al, 2009) and other organic compounds (Perkowski et al, 1996;Yan et al, 2016), in wastewater, and it has been used in pilot-scale wastewater pre-treatment (Lucasa et al, 2010;Somensi et al, 2010). However, the reaction efficiency for ozonation alone is low (Gong et al, 2008;Cuiping et al, 2009;Rao and Chu, 2009) because the reactivity of O 3 depends on the chemical structure and hydrophilicity or hydrophobicity of pollutants, and the pH of the wastewater (Chang et al, 2012).…”