Optimized treatment conditions for textile wastewater reuse using photocatalytic processes under UV and visible light sources

Abstract

In this study, photo-Fenton systems using visible light sources with iron and ferrioxalate were tested for the DOC degradation and decolorization of textile wastewater. Textile wastewaters originated after the dyeing stage of dark-colored tissue in the textile industry, and the optimization of treatment processes was studied to produce water suitable for reuse. Dissolved organic carbon, absorbance, turbidity, anionic concentrations, carboxylic acids, and preliminary cost analysis were performed for the proposed treatments. Conventional photo-Fenton process achieved near 99 % DOC degradation rates and complete absorbance removal, and no carboxylic acids were found as products of degradation. Ferrioxalate photo-Fenton system achieved 82 % of DOC degradation and showed complete absorbance removal, and oxalic acid has been detected through HPLC analysis in the treated sample. In contrast, photo-peroxidation with UV light was proved effective only for absorbance removal, with DOC degradation efficiency near 50 %. Treated wastewater was compared with reclaimed water and had a similar quality, indicating that these processes can be effectively applied for textile wastewater reuse. The results of the preliminary cost analysis indicated costs of 0.91 to 1.07 US$ m for the conventional and ferrioxalate photo-Fenton systems, respectively. Graphical Abstract ᅟ.

Intensification of UV-C treatment to remove emerging contaminants by UV-C/H2O2 and UV-C/S2O82−: Susceptibility to photolysis and investigation of acute toxicity

“…Analyzer SDI) (ISO 11348-3:2007) on samples withdrawn during UV-C photolysis and the UV-C AOP processes performed in the UV-C reactor, as described previously [47]. Allivibrio fischeri was exposed to samples diluted to different Considering the high ε254nm of LP (12 355 M -1 cm -1 ) at pH 6, its degradation by direct UV-C photolysis could have been supposed.…”

Low-cost flow photoreactor for degradation of Reactive Black 5 dye by UV/H2O2, Fenton and photo-Fenton processes: a performance comparison

“…As the Fenton process is usually performed in mild conditions and needs simple and lowcost chemicals, it can lead to economically feasible industrial applications. According to the work of Starling et al (2017), the processing cost is estimated somewhere between US$ 0.90 and 2.20 per cubic meter of treated effluent, including the energy costs.…”

“…Countless published studies have demonstrated promising aspects of advanced oxidation processes (AOP) for the degradation of organics pollutants (Fragoso et al, 2009;Guimarães et al, 2012;Vedrenne et al, 2012;Basturk et al, 2015;Abhilasha et al, 2016;Leite et al, 2016;Starling et al, 2017;Manaa et al, 2019;Mittersteiner et al, 2020). In that technique, the organic molecule undergoes successive oxidative breakings through a chain reaction initiated with highly reactive radicals, particularly the hydroxyl (•OH) and hydroperoxyl (•OOH).…”

Textiles Wastewater Treatment

“…In another study, Starling et al (2017) visible light sources and iron and ferrioxilates were used to treat organic carbon and color of the textile wastewater (Starling et al, 2017…”