Assessment of novel rotating bipolar multiple disc electrode electrocoagulation–flotation and pulsed plasma corona discharge for the treatment of textile dyes
TL;DR: The results show that the designed RBDE reactor performed much better than existing conventional electrocoagulation reactors and can be used as a pre-treatment unit for industrial wastewater, which can improve the treatment efficiency and reduces the energy consumption.
About: This article is published in Water Science and Technology.The article was published on 2020-02-01 and is currently open access. It has received 10 citations till now. The article focuses on the topics: Corona discharge & Electrolysis.
Citations
More filters
TL;DR: In this article, a chelation-based removal of azo dye Congo red (CR) from simulated wastewaters via metal ions chelation flocculation followed by flotation separation was proposed, where the chelation mechanism suggested that CR molecules gradually changed from hydrazones to electronegative azo with the increase of pH to 6-7.
20 citations
TL;DR: In this paper , a chelation-based method was proposed to remove azo dye Congo red (CR) from simulated wastewaters via metal ions chelation flocculation followed by flotation separation.
20 citations
TL;DR: In this paper, a rotary TiO2-OV@Ti-F anode was used for sulfamerazine (SMR) degradation following 4 h of electrochemical oxidation.
Abstract: Despite numerous efforts to treat wastewater with sulfonamides, their mineralization has rarely been achieved, resulting in the generation of more toxic by-products. In this study, greater than 75% mineralization of sulfamerazine (SMR) was achieved following 4 h of electrochemical oxidation. Remarkably, the Microtox® toxicity test confirmed the elimination of by-products with higher toxicity. The electrochemical treatment process was carried out using a dynamic oxygen-vacancy-mediated TiO2 anode (TiO2-OV@Ti-F), which comprised oxygen-deficient Ti4O7 coated on titanium-foam (Ti-F) via thermal spraying, allowing simultaneous high reactivity and mass transfer. SMR degradation followed a pseudo-first-order kinetics model, where the rate constant (kapp = 1.64 × 10−2 min−1) for the rotary TiO2-OV@Ti-F configuration was 1.98-fold greater than that of the static one (kapp = 8.30 × 10−3 min−1). This highlights the superiority of the rotary TiO2-OV@Ti-F anode for SMR decay. The high oxidation capabilities arose from: (i) the synergetic effect between the rotating system and the Ti4O7 coating; (ii) the enhanced mass transfer coefficient (3.49 × 10−5 m s−1) in the rotating configuration, as well as the increase in SMR degradation via direct oxidation, due to a low hole injection energy, as supported by density functional theory calculations; and (iii) boosted ˙OH formation achieved via removing the gas bubbles attached to the anode, along with lower adsorption energies for H2O and ˙OH. The results revealed that rotary TiO2-OV@Ti-F is a promising alternative for antibiotic wastewater treatment owing to its high organic mineralization and low level of energy consumption (0.29 kW per h per gTOC).
10 citations
TL;DR: In this article , the authors compared the performance of three acid azo dyes removal by electrocoagulation (EC) by using Response Surface Methodology (RSM) models and compared via four independent parameters, including initial pH (4-10), initial dye concentration (0-600 mg/L), current density (41.67-291.66 A/m2), and reaction time (3-15 min).
Abstract: This study compares the optimization models for three acid azo dyes removal by electrocoagulation (EC). First, Response Surface Methodology (RSM) models were evaluated and compared via four independent parameters, including initial pH (4–10), initial dye concentration (0–600 mg/L), current density (41.67–291.66 A/m2), and reaction time (3–15 min). Then, second-order polynomial equations of dye removal and operating cost models were separately applied as benefit and cost functions in the two-objective Imperialist Competitive Algorithm (ICA), respectively. According to the statistical analysis, not all the parameters are essential in removal efficiency for the three selected dyes. For example, the initial dye concentration and current density were the effective independent parameters in the Acid Red 18 removal model. According to the Pareto solutions, by changing the operating cost function from US$/m3 to US$/Kg removed dye, the difference between the Pareto curve points of Acid Brown 14 and Acid Orange 7 decreased significantly. Therefore, the unit of operating cost and dye type can affect the treatment policy in practice. The two-objective optimization showed an RSM deficit in predicting some corner points as previously depicted in RSM main effect plots.
9 citations
TL;DR: In this article , a dynamic oxygen-vacancy-mediated TiO 2 anode was designed for sulfonamide, which allows simultaneous high reactivity and mass transfer and alleviates the rarely achieved mineralization of sulfonamides.
Abstract: With the aim of alleviating the rarely achieved mineralization of sulfonamide, a dynamic oxygen-vacancy-mediated TiO 2 anode is designed. It allows for simultaneous high reactivity and mass transfer.
9 citations
References
More filters
TL;DR: Recommendations regarding the use of the EEO concept, including the upscaling of laboratory results, were derived from an extensive analysis of studies reported in the peer-reviewed literature enabling a critical comparison of various established and emerging AOPs based on electrical energy per order (EEO) values.
1,677 citations
TL;DR: In this article, the electrochemical advanced oxidation process electrochemical oxidation is reviewed for its performance over the treatment of actual industrial and urban effluents, and the combination of electrochemical oxide with other water treatment technologies as pre-treatment, post-treatment and integrated treatment is also examined.
482 citations
TL;DR: Advanced Oxidation Processes (AOPs) are called to fill the gap between the treatability attained by conventional physico-chemical and biological treatments and the day-to-day more exigent limits fixed by environmental regulations.
432 citations
TL;DR: The electrocoagulation process is an electrochemical means of introducing coagulants and removing suspended solids, colloidal material, and metals, as well as other dissolved solids from water and wastewaters, which has been successfully employed in removing pollutants, pesticides, and radionuclides.
Abstract: The electrocoagulation (EC) process is an electrochemical means of introducing coagulants and removing suspended solids, colloidal material, and metals, as well as other dissolved solids from water and wastewaters. The EC process has been successfully employed in removing pollutants, pesticides, and radionuclides. This process also removes harmful microorganisms. More often during EC operation, direct current is applied and electrode plates are sacrificed (dissolved into solution). The dissolution causes an increased metal concentration in the solution that finally precipitates as oxide precipitates. Due to improved process design and material of construction, the EC process is being widely accepted over other physicochemical processes. Presently, this process has gained attention due to its ability to treat large volume and for its low cost. The aim of this study is to review the mechanism, affecting factors, process, and application of the electrocoagulation process.
296 citations
TL;DR: In this article, the authors focus on quantification of hydroxyl radicals using chemical probes (dimethyl sulfoxide (DMSO) and disodium salt of terephthalic acid (NaTA)).
Abstract: High voltage pulsed electrical discharges in water are of interest for a number of applications, for example, in chemistry, water treatment, electrical transmission, and bioengineering, because of the formation of highly reactive molecular and radical species (including the hydroxyl radical). While the existence of hydroxyl radicals in these systems has been demonstrated by emission spectroscopy, accurate quantification of the rates of formation of this species is needed to develop insight into the means by which electrical discharge can promote useful chemical reactions. This paper focuses on quantification of hydroxyl radicals using chemical probes (dimethyl sulfoxide (DMSO) and disodium salt of terephthalic acid (NaTA)).
263 citations