Current-Voltage Curves for Treating Effluent Containing Hedp: Determination of the Limiting Current

Scarazzato, Tatiana; Buzzi, Daniella Cardoso; Bernardes, Andréa Moura; Tenório, Jorge Alberto Soares; Espinosa, Denise Crocce Romano

doi:10.1590/0104-6632.20150324s00003511

Cited by 24 publications

(15 citation statements)

References 13 publications

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“…In the third region (iii), the linear increase in the I-V characteristics, above the limiting current, and it is referred to as over-limiting current. 91,[97][98][99] Electrically induced convection, electroconvection, electroosmotic convection and/or water splitting at the inlet of the membrane cause the over-limiting current region. 100,101 Inhomogeneities of the membrane results in an irregular electric field that interacts with the extended space charge.…”

Section: Limiting Currentmentioning

confidence: 99%

Overcoming Limitations of Iontronic Delivery Devices

Seitanidou

2020

Linköping Studies in Science and Technology. Dissertations

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Section: Limiting Currentmentioning

confidence: 99%

Overcoming Limitations of Iontronic Delivery Devices

Seitanidou

2020

Linköping Studies in Science and Technology. Dissertations

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“…Remoción de cRomo de efluentes de la industRia cuRtiembRe mediante electRodiálisis La corriente límite de la celda de electrodiálisis queda determinada por el menor valor local promedio entre la membrana de intercambio catiónico y anió-nico (Scarazzato et al, 2015).…”

Section: Ind Data 21(1) 2018unclassified

Remoción de cromo de efluentes de la industria curtiembre mediante electrodiálisis

Nuñez

Ángeles

Pichihua

et al. 2018

idata

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RESUMENLas sales de cromo son reactivos químicos muy utilizados en la industria de curtiembre porque son eficientes para curtir la piel animal, sin embargo, estas sales no se fijan totalmente, por lo que, sus remanentes van a parar a los efluentes, impactando gravemente al medioambiente. El objetivo de este estudio fue remover el cromo (VI) y cromo total de un efluente de curtiembre utilizando electrodiálisis, para ello, se caracterizó una muestra de un efluente de una planta piloto de curtiembre y se preparó una solución sintética en base a ésta, utilizando una sal de cromo para curtiembres de grado industrial, luego, se determinó la corriente límite y se realizó pruebas de electrodiálisis con el 80, 100 y 120% de la corriente límite. Los resultados demostraron que el mayor porcentaje de extracción y el menor consumo de energía eléctrica fue al 80% de la corriente límite. Palabras-claves:Curtiembre; Cromo; Electrodiálisis. Removal of chromium from effluents of tannery industry by electrodialysis ABSTRACTChromium salts are chemical reagents widely used in the tannery industry because they are efficient for tanning animal skin, however, these salts are not completely fixed, so their remnants go to their effluents, seriously impacting the environment. The objective of this study was to remove chromium (VI) and total chromium from a tannery effluent using electrodialysis, for this purpose, a sample of an effluent from a tannery pilot plant was characterized and then a synthetic solution was prepared based on this, using an industrial grade chrome salt for tannery, then the limiting current was determined and electrodialysis tests were carried out with the 80, 100 and 120% of the limiting current. The results showed that the highest percentage of extraction and the lowest electricity consumption was 80% of the limiting current.Keywords: Tannery; Chromium; Electrodialysis. INTRODUCCIÓNEl sulfato básico de cromo es el agente químico más utilizado en la industria de curtiembre. Su eficiencia es mayor que utilizar agentes vegetales de curtición, sin embargo, el cromo no se fija por completo en la piel animal, por eso, los remanentes son desechados en sus efluentes (Chávez, 2010) Existen diversos procesos para remover el cromo, como: precipitación, intercambio iónico, materiales adsorbentes, biomateriales, biotecnología y electrocoagulación (Chávez, 2010). Otro proceso de remoción basado en membranas es la electrodiálisis (Lambert et al., 2006). La electrodiálisis es un proceso de separación con electromembrana, se basa en la selectividad de las membranas de intercambio iónico. Estas membranas contienen grupos funcionales con cargas eléctricas fijas en la matriz polimérica, de modo que, permiten la permeación de los iones de carga opuesta en una solución, bajo la influencia de un campo eléctrico continuo (Koter y Warszawski, 2000). La electrodiálisis se aplica para extraer especies químicas iónicas a partir de soluciones acuosas. Por lo general, la alimentación es una solución que contiene iones que al ser tratadas media...

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“…A similar experimental setup was used, except that the dilute reservoir capacity was reduced to 1 L. For the heterogeneous membrane, the limiting current density was settled as reported in a previous work (131). The polarization curves for the homogeneous membranes were carried out in triplicate, for both anion-exchange and cation-exchange membranes.…”

Section: Methodsmentioning

confidence: 99%

“…The limiting current density for the HDX 200 membrane was used according to previous studies (24,131). Figure 57 shows the current-voltage curve obtained in triplicate for the auxiliary cation-exchange membrane (PC SK) and Figure 58 shows the CVC curve in triplicate for the anion-exchange PC 200D membrane.…”

Section: Electrodialysis In Batch Systemmentioning

confidence: 99%

Treatment of a cyanide-free copper electroplating solution by electrodialysis: study of ion transport and evaluation of water and inputs recovery

SCARAZZATO¹

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The two most common commercial copper baths are the acid sulfate copper bath and the alkaline cyanide copper bath. Alkaline copper baths are mostly used to coat parts with complex geometry and to avoid galvanic deposition when depositing a metal on a less noble substrate. Because of the toxicity of cyanide compounds, alternative baths have been developed using different complexing agents. The starting point of the present study is a cyanide-free strike bath developed for copper plating on Zamak substrates developed by the Institute for Technological Research of the State of São Paulo/ Brazil. The replacement of a raw material such as cyanide must be economically advantageous and technically feasible. Therefore, this study intended to propose an alternative to the treatment of liquid wastes from the mentioned bath, aiming at simultaneous water reclamation and chemicals recovery in a closed system. The electrodialysis membrane separation process was studied, using a laboratoryscale system operating with a synthetic solution simulating the rinsing waters from the HEDP-based bath. The feasibility of the technique was evaluated by analyzing operational parameters such as ion extraction, demineralization rate, concentration rate, current efficiency for each anionic specie and average energy consumption. Because HEDP is a chelating agent, the transport of Cu(II)-HEDP chelates through anion-exchange membranes was also evaluated by means of electrochemical methods. Chronopotentiometric and current-voltage curves were constructed for different model solutions containing the same compounds as the original bath. A relation between the presence of chelates in the solutions and the fixed ion exchange group could be established. Lastly, deposition tests were performed using electrolytes containing the recycled inputs and the characteristics of the coatings were analyzed. The results showed that an electrodialysis stack using strongly basic anion-exchange membranes was suitable to produce treated solutions and a concentrate containing the ions from the bath. The concentrate could be added to the copper bath to compensate eventual drag-out losses without affecting the quality of the coatings. Thus, the application of electrodialysis was shown to be a feasible alternative for recovering water and inputs from the evaluated solution, reducing the wastewater generation and saving natural resources.

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Current-Voltage Curves for Treating Effluent Containing Hedp: Determination of the Limiting Current

Cited by 24 publications

References 13 publications

Overcoming Limitations of Iontronic Delivery Devices

Overcoming Limitations of Iontronic Delivery Devices

Remoción de cromo de efluentes de la industria curtiembre mediante electrodiálisis

Treatment of a cyanide-free copper electroplating solution by electrodialysis: study of ion transport and evaluation of water and inputs recovery

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