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- W3159537303 abstract "In this research it is studied the electrochemical reduction of Cr (VI), in order to meet the discharge limits indicated in the environmental law. Experimental tests were done using a number of electrochemical reactors that use electrodes made of plain carbon steel. Three main variables were identified, pH, current density and flow, that significantly affects the reduction process of Cr (VI). Based on the chemical and thermodynamic characteristics of the systems Cr (VI)-Cr(III)-H2O-e- and Fe(III)-Fe(II)-H2O-e- the reduction process was optimized. A comparison between the classical chemical precipitation method and the electrochemical means was performed. Although both are based in the same general reaction: 3Fe (II) (aq) + 3Cr (VI) (aq) ↔ 3Fe (III) (aq) + Cr (III) (aq), the way in which the required amount of Fe(II) is added to the wastewater, is different for each method. In the chemical method, Fe(II)(aq) is supplied by dissolving FeSO4⋅7(H2O)(s) into the wastewater, while in the electrochemical process Fe(II)(aq) ions are formed directly in solution by anodic dissolution of an steel electrode. After this reduction process, the resulting Cr (III)(aq) and Fe(III)(aq) ions are precipitated as insoluble hydroxide species, in both cases, changing the pH using a 1M solution of calcium hydroxide . Experimental results shows that using both methods a Cr (VI) reduction efficiency of 99.5 % is possible to be achieve. However, the electrochemical option, apart from providing a better form of control, generates significantly less sludge as compared with the chemical process (60 %). Finally, a mathematical model that simulates the process is presented. As a conclusion, optimal conditions for continuous Cr (VI) reduction using a plug flow reactor are found." @default.
- W3159537303 created "2021-05-10" @default.
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- W3159537303 date "2021-03-13" @default.
- W3159537303 modified "2023-09-27" @default.
- W3159537303 title "Remoción de cromo hexavalente, presente en aguas residuales industriales por métodos electroquímicos" @default.
- W3159537303 doi "https://doi.org/10.24275/uama.6735.7472" @default.
- W3159537303 hasPublicationYear "2021" @default.
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