Anoxic/oxic membrane bioreactor assisted by electrocoagulation for the treatment of azo-dye containing wastewater

Ravadelli, Mauana; Costa, Rayra Emanuelly da; Lobo-Recio, María Ángeles; Akaboci, Tiago Rogerio Vitor; Bassin, João Paulo; Lapolli, Flávio Rubens; Belli, Tiago José

doi:10.1016/j.jece.2021.105286

Cited by 46 publications

(12 citation statements)

References 77 publications

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“…[32]. The present study indicated that the appropriate connection was Mono-polar Connection in Parallel as it decreases the potential difference and the time of decolorization that leads to a decrease in the energy consumption and that agrees with the previous study [21,33] which showed that MP-P mode is the most cost-effective for both electrode connection type as it reduced color removal by 98.8 %, COD and reduced to 256 mg /L, and energy Consumption was 2.5 kWh/m 3 [34], while Bipolar Connection in Series = 4 kWh/L and Mono-polar Connection in Series =10.66 kWh/L Fig. 5.…”

Section: Effect Of Electrical Conductivity On Cod Removal Efficiencysupporting

confidence: 89%

“…Many studies reported that if < 2 and > 10 the aluminum hydroxide particles did not have deposition leding to decrease in the efficiency of the pollutant removal in this process [19,29,30] One key parameter of EC treatment is the pH of the solution that plays an important role in electrocoagulation for both materials, it is clear that COD and turbidity removals show the same trend. The highest removal efficiencies have been obtained with aluminum in acidic medium with < 6 while the iron is more efficient in neutral and alkaline medium [31][32][33][34] Fig. 2 .Color removal efficiency and COD removal using Aluminum, Iron and Stainless steel Electrodes at pH=10.5…”

Section: Effect Of Applied Potentialmentioning

confidence: 97%

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Environment -friendly processes: Electrocoagulation and Activated carbon filtration for reuse of textile wastewater

Abdelshafy

Sadik

2021

Egypt. J. Chem.

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Electrocoagulation is a simple method used for removing contaminants and recycling wastewater by using aluminum, stainless steel and iron electrodes. Textile wastewater was collected from the textile processing industry. This promising treatment consists of two steps, electrocoagulation as a first step completed with Activated carbon filtration as a second step reported in this work. The contaminants of the solution combined in the situ forming metal hydroxide flocs, which filtered as a precipitate or skimmed as a float. To revenue the best advantage of this system, the two processes should run in a rational sequence. Several important parameters, such as applied potential, Electrode material and conductivity were studied to achieve higher removal efficiency. Scanning electron microscope (SEM) analysis, Atomic force microscopy (AFM) and the electrical connection of electrodes were investigated. The results showed clearly that the stainless steel electrode can enhance effectively color removal by 98.8 %, reduced COD to 256 mg /L, while Activated carbon filtration can almost remove the total dissolved solids (TDS) and, turbidity. The findings showed that in textile wastewater at pH=10.5 the stainless steel is superior to iron and aluminum as a sacrificial electrode material and Mono-polar Connection in Parallel is the best connection as it decreases the potential difference, and energy Consumption was 2.5 kWh/m3.

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Section: Effect Of Electrical Conductivity On Cod Removal Efficiencysupporting

confidence: 89%

Section: Effect Of Applied Potentialmentioning

confidence: 97%

Environment -friendly processes: Electrocoagulation and Activated carbon filtration for reuse of textile wastewater

Abdelshafy

Sadik

2021

Egypt. J. Chem.

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“…The results obtained were mostly consistent and, in some cases, showed much better decolorization performance than those using conventional adsorption, photocatalysis, filtration and bacterial treatment processes for decolorizing the dye mixture, Methylene Blue and Rhodamine Blue dye solutions [2,16,54]. It must be noted that dye removal levels reached here were similar to those obtained using nanofiltration coupled with wet oxidation, PVDF membrane sensitized nano zeolite, MBR with electrocoagulation and Ag/Pd-loaded ZnO nanofiber membrane with UV irradiation, where over 85% of color removal [55][56][57][58] was shown. Some other membrane-based dye removal treatment processes, such as nanofiltration under unstirred batch and continuous crossflow mode [59] and activated carbon-PVDF Blend Membrane [60] showed the limitations and were capable of decolorizing just up to 70%.…”

Section: Biodecolorization Performance Of Cscm and Csgomsupporting

confidence: 61%

Compact Carbon-Based Membrane Reactors for the Intensified Anaerobic Decolorization of Dye Effluents

et al. 2022

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Carbon-based membranes integrated with anaerobic biodegradation are presented as a unique wastewater treatment approach to deal with dye effluents. This study explores the scope of ceramic-supported carbon membrane bioreactors (B-CSCM) and ceramic-supported graphene oxide membrane bioreactors (B-CSGOM) to decolorize azo dye mixtures (ADM) and other dyes. The mixture was prepared using an equimolar composition of monoazo Acid Orange 7, diazo Reactive Black 5, and triazo Direct Blue 71 dye aqueous solution. Afterwards, as in the ADM experiment, both compact units were investigated for their ability in the biodecolorization of Methylene Blue (MB) and Rhodamine B (RhB) dye solutions, which do not belong to the azo family. The obtained outcomes revealed that the conductive surface of the graphene oxide (GO) membrane resulted in a more efficient and higher color removal of all dye solutions than B-CSCM under a wide feed concentration and permeate flux ranges. The maximum color removal at low feed concentration (50 mg·L−1) and permeate flux (0.05 L·m−2·h−1) was 96% for ADM, 98% for MB and 94% for RhB, whereas it was 89%, 94% and 66%, respectively, for B-CSCM. This suggests that the robust, cost-effective, efficient nanostructures of B-CSGOM can successfully remove diverse azo dye solutions from wastewater better than the B-CSCM does.

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“…Methyl orange is one of the azo dyes that contain a large number of aromatic rings; this dye compound is also a group of chemical compounds that may result in increasing amounts of environmental pollution. Therefore, the removal process for this compound from wastewater has gained great attention [53][54][55][56][57][58][59][60][61][62][63][64]. As shown in Figure 5, the methyl orange compound was successfully decomposed into its derived compounds using the high-voltage discharge plasma treatment with the different types of metal electrodes.…”

Section: Resultsmentioning

confidence: 99%

Pulsed Discharge Plasma in High-Pressure Environment for Water Pollutant Degradation and Nanoparticle Synthesis

Diono

Machmudah

Kanda

et al. 2021

Plasma

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The application of high-voltage discharge plasma for water pollutant decomposition and the synthesis of nanoparticles under a high-pressure argon gas environment (~4 MPa) was demonstrated. The experiments were carried out in a batch-type system at room temperature with a pulsed DC power supply (15.4 to 18.6 kV) as a discharge plasma source. The results showed that the electrode materials, the pulsed repetition rates, the applied number of pulses, and the applied voltages had a significant effect on the degradation reactions of organic compounds. Furthermore, carbon solid materials from glycine decomposition were generated during the high-voltage discharge plasma treatment under high-pressure conditions, while Raman spectra and the HRTEM images indicated that titanium dioxide with a brookite structure and titanium carbide nanoparticles were also formed under these conditions. It was concluded that this process is applicable in practice and may lead to advanced organic compound decomposition and metal-based nanoparticle synthesis technologies.

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Anoxic/oxic membrane bioreactor assisted by electrocoagulation for the treatment of azo-dye containing wastewater

Cited by 46 publications

References 77 publications

Environment -friendly processes: Electrocoagulation and Activated carbon filtration for reuse of textile wastewater

Environment -friendly processes: Electrocoagulation and Activated carbon filtration for reuse of textile wastewater

Compact Carbon-Based Membrane Reactors for the Intensified Anaerobic Decolorization of Dye Effluents

Pulsed Discharge Plasma in High-Pressure Environment for Water Pollutant Degradation and Nanoparticle Synthesis

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