Optimization of Reactive Blue 19 dye removal using ozone and ozone/UV employing response surface methodology

Abstract

This work reports the degradation of Reactive Blue 19 (RB19) dye using ozone and ozone/UV. The effects of operational parameters such as pH, ozone concentration and UV radiation were examined. A two factor with three levels factorial design was carried out and the interaction between variables was studied. Response surface methodology was applied in order to optimize ozone concentration, pH and UV radiation in terms of the half life time required for discoloration and/or mineralization of the solution. Equations of color and TOC half-life time with respect to operational conditions were determined. Contour plots and a desirability function were used to find the local points of optimization. Optimized reaction conditions were established as pH 8.26, UV radiation of 40 W and ozone concentration of 50 g Nm −3 . A specific experiment was carried out under the optimal conditions where RB19 half life time was 1.59 min and TOC half life time was 30.98 min, confirming the agreement between model and experimental results. The obtained results confirm ozonation as a promising alternative for treatment of wastewater with a high content of recalcitrant reactive dyes.

Synthesis of Sulfonated Polystyrene-Based Porous Activated Carbon for Organic Dyes Removal from Aqueous Solutions

“…Different technologies have been adopted to remove various colorant materials from aqueous solutions and industrial wastewaters, among which adsorption, chemical coagulation, ozonation, photocatalysis and advanced oxidation processes and are the most efficiently used methods [10][11][12][13][14][15]. Sometimes some of these methods have been revealed to be limited efficiency and time consuming, in addition, they require high operating costs.…”

Decolorization of Boron-Based Wood Preservatives by Ozonation for Recycling: Optimization of Process Parameters

“…As has been previously reported in the literature, color removal efficiency by ozone is dependent on various operational parameters such as reaction time, ozone dosage, initial pH, initial pollutant concentration, and temperature of the solution [26][27][28]. To determine the effects of each operational variable, a traditional approach known as one-factor-at-a-time (OFAT) is widely practiced.…”

Orange-derived and lemon-derived adsorbents with controlled grain for an efficient elimination of some cationic and anionic dyes

“…It is estimated that approximately 100 tonnes/year of dyes are discharged into water and about 70% are azo type dyes (Gupta and Suhas, 2009; Ihsanullah et al , 2020). With the aim to discolour streams, several techniques have been investigated, including chemical (oxidation and electrolysis) (Corona-Bautista et al , 2021; Pacheco-Álvarez et al , 2019; Suhadolnik et al , 2019), ozonation (Abrile et al , 2020), physical (reverse osmosis, filtration, coagulation/flocculation and adsorption) (Ahmad et al , 2015; Al-Aoh, 2021; Paixão et al , 2020), combination of chemical and physical (Rezaee et al , 2008) and even biological (microorganisms and enzymes) processes (Arabaci and Usluoglu, 2014; Garg and Tripathi, 2017; Saratale et al , 2011). The majority of those operations incur in, among others, elevated maintenance level and manpower with high expertise that affects the final cost of the process and the profitability of the production (Donkadokula et al , 2020; Hauser, 2011; Soares et al , 2017).…”