|
|||||
|
|
Hydrodynamic effects on the performance of an electrochemical reactor for destruction of copper cyanide. Part 2—reactor kinetics and current efficiencies |
|
| Authors: | Lidia Szpyrkowicz Geoffrey H. Kelsall Francesco Ricci |
| Affiliation: | a Environmental Sciences Department, University of Venice, Dorsoduro 2137, 30123 Venice, Italy b Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK c Department of Physical Chemistry, University of La Laguna, 38071 Tenerife, Spain d National Environmental Engineering Research Institute, 440020 Nagpur, India |
| Abstract: | An electrochemical reactor, with stainless-steel electrodes, was used for treatment of a wastewater containing dilute copper(I) cyanide. Both anodic cyanide oxidation and cathodic copper(I) reduction could be operated under mass transport control, when reactions rates and current efficiencies were influenced by hydrodynamic conditions created by pumping and gas sparging, used to enhance reactor performance. Pumping promoted the rate of Cu electrodeposition to a greater extent than sparging with compressed air, whereas the latter slightly enhanced the rate of cyanide destruction. A hypothesis of cathodic O2 reduction generating oxidising species, which react homogeneously with cyanide, was verified experimentally. The specific electric energy consumption, calculated for typical values of current densities and current efficiencies, were 0.34 kWh mol-1 Cu and 0.24 kWh mol-1 CN-). |
| Keywords: | Electrolysis Hydrodynamics Wastewater treatment Cyanide destruction Copper electrodeposition |
| 本文献已被 ScienceDirect 等数据库收录！ | |