Removal of Reactive Black 5 dye from aqueous solutions by coupled electrocoagulation and bio-adsorbent process

Abstract

BackgroundTextile wastewater contains a significant amount of bio dye compounds including Reactive Black 5 (RB5) as an Azo dye that causes serious damage to the environment and aquatic life in receiving water resources. It is estimated that approximately 15% of the dyestuff is discharged into water bodies and 50% of those are Azo dyes.ObjectiveThe aim of this study was to examine the effectiveness of combining electrocoagulation and bio-adsorption methods using the active carbons from Kenya tea waste to remove RB5 from aquatic solutions.MethodsExperiments were done in wastewater and the Wastewater laboratory of Gonabad University of Medical Sciences in 2017. Initially, iron electrodes were installed in a 1 L glass container and connected to electrical power with primary dye concentration of 500 mg/l, EC 1000–3000 μs/cm, adsorbent dosage of 0.2–1.0 mg/l, pH 2–9 and electrical potential 30 V. After that, the samples were collected at twenty-minute intervals until the eightieth minute. Performance of dye removal was measured using spectrophotometer techniques (597 nm). Finally, the data were analyzed by descriptive statistics using Microsoft Excel 2017 version.ResultsThe findings of this study demonstrated that the highest simultaneous removal performance (96%) was obtained by pH 6, 80-minute reaction time, and EC 3000 μs/cm. With the increasing of reaction time, the energy consumption, electrodes wear, pH, final temperature of effluent, and removal efficiency would increase. Adsorption process could play a small role in the removal of the dye, while it was very effective in improving the performance of the electrocoagulation process.ConclusionA combination of the electrocoagulation and adsorption processes can be adopted as an efficient and economical way to treat effluents contaminated with dyestuff.

Microbial decolorization of Reactive Black 5 dye by Bacillus albus DD1 isolated from textile water effluent: kinetic, thermodynamics & decolorization mechanism

“…The decolorization was only 40% at 25 °C, which increases to 60% at 30 °C and further increases up to 75 % at 40 °C as shown in Figure 1 c, however further temperature rise leads to the decrease in decolorization up to 23% due to the loss of the cell viability ( Shah, 2016 ; Meng et al., 2019 ). Similar results are were also reported by El Bouraie and El Din (2016) ; Naraghi et al. (2018) ; Xie et al.…”

“…Moreover, they are harmful for life forms due to their mutagenic and carcinogenic nature, due to the presence of one or more azo bonds ( Droguett et al., 2020 ). For the removal of reactive azo dyes of RB5 from waste water a number of methods including membrane separation, electrocoagulation ( Ghaffarian Khorram and Fallah, 2019 ); adsorption ( Martínez-Sánchez et al., 2018 ; Naraghi et al., 2018 ; Wielewski et al., 2020 ); Oxidation ( Vasconcelos et al., 2016 ); Ozonation ( Zheng et al., 2016 ) are used. Among all these methods, membrane separation, electrocoagulation, direct precipitation or adsorption simply modify the pollutants from one phase to another.…”

Removal of Reactive Dye from Textile Mill Wastewater by Leading Electro-Coagulation Process Using Aluminum as a Sacrificial Anode

“…There is formation of gas bubbles, which help the lighter pollutants to be removed by flotation [3]. Experiments done in Textile wastewater contained a significant amount of bio dye compounds including Reactive Black 5 (RB5) as an Azo dye which causes serious damage to the environment and aquatic life in receiving water resources by [4]. An excessive intake of fluoride causes severe dental or skeletal fluorosis.…”

Influence of the Electrocatalytic Anode Nature on Dye Destruction

“…Among the ECM, a special place is occupied by processes based on ECO or the reduction of harmful substances present in wastewater. [27][28][29][30][31][32][33] A distinctive feature of these RedOx processes is their multistage nature and the complexity of the reaction mechanism. Other methods are mainly associated only with the phase transformation of substances in the aquatic environment and do not include the process of destruction.…”

“…Among the ECM, a special place is occupied by processes based on ECO or the reduction of harmful substances present in wastewater [27–33] . A distinctive feature of these RedOx processes is their multistage nature and the complexity of the reaction mechanism.…”