Simultaneous removal of chromium and organic pollutants in tannery wastewater by electroprecipitation technique

Kongjao, Sangkorn; Damronglerd, Somsak; Hunsom, Mali

doi:10.1007/s11814-007-0034-6

Cited by 20 publications

(7 citation statements)

References 22 publications

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“…The COD removal efficiency of the Ti/RuO 2 electrodes in this study is comparable with the report of Panizza and Cerisola (2004) using a Ti/RuO 2 electrode, which had a removal efficiency of 90% after 12 h of electrolysis at current density of 60 mA/cm 2 and input COD 2100 mg/L. Kongjao et al (2007) showed that the COD removal efficiency of Ti/RuO 2 electrodes in tanning effluents using an input concentration of 17,240-17,860 mg/L gave a high efficiency of 82% at current density 60.5 mA/cm 2 after 1 h of electrolysis. The main mechanism of pollutant treatment using a Ti/ RuO 2 electrode is based on indirect electrolysis, so the direct oxidation on the electrode surface is negligible (Luu et al 2019a, b).…”

Section: Effect Of Initial Phsupporting

confidence: 85%

“…In addition, the COD removal efficiencies in this study were matched with the research of Panizza and Cerisola (2004) when using a Ti/RuO 2 electrode, which provided 90.0% COD removal efficiency after 12 h of electrolysis at a current density of 60.0 mA/cm 2 (input COD 2100.3 mg/L). Kongjao et al (2007) reported that the COD removal efficiency of Ti/ RuO 2 electrodes in tanning wastewater was 82.0% at current density 66.7 mA/cm 2 after 1 h of electrolysis at an initial concentration of 17,240.2-17,860.8 mg/L.…”

Section: Effect Of Current Densitymentioning

confidence: 99%

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Tannery wastewater treatment after activated sludge pre-treatment using electro-oxidation on inactive anodes

Luu

2020

Clean Techn Environ Policy

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Currently, electrochemical oxidation is a very efficient method to treat many types of wastewaters. Under the effects of electrical current, toxic or non-biodegradable substances will be oxidized to become biodegradable or completely oxidized to CO 2 and H 2 O. With the strengthening of environmental discharge legislations, tannery wastewater may have a negative effect on the environment because of its high pollution levels. In this study, for the first time, the tannery wastewater treatment after the activated sludge process digestion was carried out using electrochemical oxidation by SnO 2 /Ti and PbO 2 / Ti inactive anodes. Effects of current density, pH, stirring rate and reaction time on the pollutants removal efficiencies of tannery wastewater were studied. The results showed that SnO 2 /Ti and PbO 2 /Ti anodes can effectively remove over 80.0% of the color, chemical oxygen demand and total nitrogen in tannery wastewater after 90 min of reaction time at a current density of 66.7 mA/cm 2. SnO 2 /Ti anodes gave higher pollutants removal efficiency in base environments, while PbO 2 /Ti anodes offered higher pollutants removal efficiency in acidic environments. The current density and stirring rates significantly affected pollutant removal efficiencies, and the concentration of pollutants in the effluent decreased as reaction time was increased. In general, SnO 2 /Ti anodes were found to be more effective than PbO 2 /Ti anodes in the pollutants removal efficiency and energy consumption of tannery wastewater treatment.

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Section: Effect Of Initial Phsupporting

confidence: 85%

Section: Effect Of Current Densitymentioning

confidence: 99%

Tannery wastewater treatment after activated sludge pre-treatment using electro-oxidation on inactive anodes

Luu

2020

Clean Techn Environ Policy

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“…Although there is a growing number of studies regarding the removal of heavy metals and organic contaminants using different treatment technologies [86], very few publications address the simultaneous removal of different types of pollutants in real context scenarios, such as complex industrial effluents. Among the different strategies adopted for the simultaneous removal of heavy metals and organic pollutants that have been reported in literature, namely adsorption processes [87,88], photocatalysis [89,90], electroremediation [91,92] and biological processes [46,93], the last present important advantageous due to the possibility for heavy metals recovery, cost-effectiveness and regeneration of the biosorbents used [94]. Although the use of biological processes is associated with some limitations, for instance not all microorganisms have the ability to breakdown any pollutants, as well as the inhibition of growth due to the presence of toxic pollutants, in this work that limitations were overcome since the developed permeable bio-barrier revealed to be efficient on the simultaneous removal of ketones and heavy metals.…”

Section: Discussionmentioning

confidence: 99%

Rehabilitation of a complex industrial wastewater containing heavy metals and organic solvents using low cost permeable bio-barriers – From lab-scale to pilot-scale

Silva

Rocha

Lago

et al. 2021

Separation and Purification Technology

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This work addresses the treatment of a complex industrial effluent containing high concentrations of metals and spiked with two organic solvents (diethylketone -DEK, and methyl ethyl ketone -MEK) using an eco-friendly approach. The treatment system herein proposed consists of a bio-barrier that combines the adsorption capacity of sepiolite with the properties of a Streptococcus equisimilis biofilm with proven ability in the degradation and bioremoval of a wide range of pollutants.Results from the open-systems experiments conducted with raw sepiolite exposed to a binary mixture of DEK and MEK revealed the preference of the sorbent towards DEK. The results from the biodegradation experiments also revealed the preference of S. equisimilis to degrade/bioremove DEK over MEK independently of their initial concentration (100 mg/L to 3200 mg/L). Bioremoval percentages higher than 95% were reached for all the concentrations of DEK tested. The lab-scale experiments conducted in open-system with sepiolite and sepiolite covered with biofilm, and the pilot-scale experiment conducted in closed-loop, revealed similar performances on the rehabilitation of an industrial effluent containing heavy metals and additionally spiked with DEK and MEK. Regarding the selectivity towards the different pollutants, Cu was preferentially removed over Cr and Ni, and DEK over MEK. The presence of the biofilm allowed an improvement on the removal of heavy metals, particularly Cr, besides preventing the leaching of Al, Fe, and Mg from the sepiolite structure, an extremely important advantage in comparison to the system without biofilm. EDS analyses performed in sepiolite samples revealed the presence of several metals (Cr, Cu and Ni), proving thus the occurrence of sorption processes by sepiolite and by sepiolite covered by biofilm. The breakthrough data obtained in the open-systems were properly described by the Dose Response and the Yoon and Nelson mathematical models. More research work needs to be performed with complex industrial effluents aiming the optimization of the treatment systems to be applied in real context scenarios.

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“…For BOD, close to 100% removal of BOD was attained by employing a UV-A power of 90 W for 20 min, as opposed to ~70% at 60 W, but further increasing the UV-A intensity above 90 W decreased the level of BOD removal attained. This may be due to the reduction of Fe 3+ to Fe 2+ according to reactions (3) and (4) at higher UV-A levels where the Fe 2+ species can react with the dissolved oxygen leading to a decrease in the amount of dissolved oxygen in the treated wastewater as displayed by reaction (10) [28]. Therefore, a UV-A power of 90 W was deemed to be the optimum for treating textile wastewater by the photo-oxidation process in a continuous stirred tank reactor.…”

Section: -1 Effect Of Uv Powermentioning

confidence: 99%

The optimization of the photo-oxidation parameters to remediate wastewater from the textile dyeing industry in a continuous stirred tank reactor

Kortangsakul

Hunsom

2009

Korean J. Chem. Eng.

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The remediation of textile dying wastewater was carried out at ambient temperatures in a pilot-scale continuous stirred tank reactor by using the photo-Fenton oxidation process. The preliminary results suggest that the treatment system reached a steady state condition within 5-10 min after it was started up. By using a 2 k factorial design, the effects of various parameters on the removal efficiency of color, BOD and COD were identified under steady state conditions. The removal efficiencies of color and BOD were affected by the feed rate of H 2 O 2 and Fe 2+ , whereas none of the parameters in the investigated ranges affected the removal efficiency of COD. Consequently, using univariate analysis to investigate higher parameter range values, the optimum conditions for treating textile wastewater were found to be 25 ml H 2 O 2 /min, 5 ml Fe 2+ /min and 90 W UV-A power for 20 min. In addition, the removal of all pollutants was enhanced within the acidic pH range. Approximately 69.2, 99.4 and 48.5% of color, BOD and COD were removed, respectively. However, the concentration of TDS increased slightly during the treatment period due to the formation of new species or intermediate oxidation products. Nevertheless, all values of pollutants in the treated wastewater except COD were in the range of the standard values permitted for discharge into the environment.

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Simultaneous removal of chromium and organic pollutants in tannery wastewater by electroprecipitation technique

Cited by 20 publications

References 22 publications

Tannery wastewater treatment after activated sludge pre-treatment using electro-oxidation on inactive anodes

Tannery wastewater treatment after activated sludge pre-treatment using electro-oxidation on inactive anodes

Rehabilitation of a complex industrial wastewater containing heavy metals and organic solvents using low cost permeable bio-barriers – From lab-scale to pilot-scale

The optimization of the photo-oxidation parameters to remediate wastewater from the textile dyeing industry in a continuous stirred tank reactor

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