Application of the trickle tower to problems of pollution control. III. Heavy-metal cyanide solutions

El-Ghaoui, E. A.; Jansson, Robert

doi:10.1007/bf01112067

Cited by 22 publications

(11 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The problem of removing copper simultaneously with destruction of its organic complexes, particularly with cyanides, has gained less attention. El-Ghaoui et al, 12 who studied the removal of cyanides from coppercomplexed solutions in a packed-bed glass tower, found the process feasible. However, no data on copper removal were presented.…”

Section: Introductionmentioning

confidence: 99%

Copper Electrodeposition and Oxidation of Complex Cyanide from Wastewater in an Electrochemical Reactor with a Ti/Pt Anode

Szpyrkowicz

Zilio‐Grandi

Kaul

et al. 2000

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The paper presents the results of a study on the simultaneous electrooxidation of cyanides and recovery of copper as a metallic deposition on the cathode from weak concentration rinse wastewater in an electrochemical reactor with a Ti/Pt anode. Both a direct electrooxidation process and an indirect electrooxidation in a chloride-rich medium proved feasible, with direct electrooxidation being preferable because of the lower energy consumption. The results show that the process of the direct electrooxidation under alkaline conditions leads to the formation of an electrocatalytic film on the anode. Simultaneous copper electrodeposition on the cathode is feasible and economically convenient, particularly if conducted at pH 13 or higher. The process can be described by the pseudo-first-order kinetics, with the rate constant for Cu removal equal to 0.013 h -1 for very alkaline conditions. Energy consumed for copper electrodeposition proved to be inversely proportional to the initial Cu concentration. For wastewater bearing 1100 mg dm -3 Cu, 5.46 kWh is needed to eliminate 1 kg of metal. The current efficiency for chemical oxygen demand removal reaching 100% or higher was obtained, indicating reactions other than electrooxidation occurring simultaneously. Under the best conditions, the total cyanide concentration was lowered from 250 to 7.9 mg dm -3 .

show abstract

Section: Introductionmentioning

confidence: 99%

Copper Electrodeposition and Oxidation of Complex Cyanide from Wastewater in an Electrochemical Reactor with a Ti/Pt Anode

Szpyrkowicz

Zilio‐Grandi

Kaul

et al. 2000

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Developments at Southampton and Newcastle universities in the 1970s were mostly carried out in the research groups of Fleischmann, Jansson et al with conductive Raschig rings. [31][32][33]35 Some were hexagonally fluted internally but smooth on their outer surface. While absorption columns normally use random packings, the BTTR needs an ordered arrangement, both within each layer (to encourage good flow distribution) and between neighbouring layers…”

Section: Electrode Materialsmentioning

confidence: 99%

“…El Ghaoui and Jansson electrolysed copper, nickel and zinc cyano complex electrolytes to deposit metal at cathode zones and oxidise cyanide at anodic zones under mass transport control. 35 They expressed the reactant conversion of the electrolyte in the tank through equation ( 28) in terms of qL:…”

Section: Mass Transfermentioning

confidence: 99%

“…The experimental data was analysed via a semilogarithmic plot of c(t) vs. t, allowing the fraction of side active area, qL to be estimated. Values in the range of 0.11 to 0.48 were generally found and qL is approximately given by the expression: 33,35 𝜃 , = 1 −…”

Section: Mass Transfermentioning

confidence: 99%

“…In a related paper, the same authors studied the decay of metal ion concentration during the treatment of heavy metal cyanide solutions in the batch recirculation mode. 35 Figure 14 shows the decrease in concentration of various metal ions as a function of time as they are deposited on the cathodic regions of the tower. The scaling law shown in equation ( 45) proved useful but behaviour was complicated by the cyanocomplex presence; the ratio of cyanide to metal in solution decreased with time due to anodic oxidation of cyanide.…”

Section: Removal Of Cyanide Ionsmentioning

confidence: 99%

See 2 more Smart Citations

Editors’ Choice—Critical Review—The Bipolar Trickle Tower Reactor: Concept, Development and Applications

Walsh

Arenas

León

2021

J. Electrochem. Soc.

View full text Add to dashboard Cite

The concept of a trickle tower, using ordered bipolar electrode elements stacked in (10 to 80) similar layers of porous, 3D electrodes separated by insulating separator meshes is described and key features of electrochemical reactors based on the bipolar trickle tower reactor (BTTR) geometry are reviewed. Fluid flow, mass transfer, active area and bypass current are considered in detail, since they affect the reaction environment. Modified reactor designs have resulted from the process of electrode selection and tower construction. The performance of BTTRs is illustrated by examples from laboratory and industry, including electrosynthesis and environmental treatment. Experimental data are used to rationalise reaction environment and simulate performance. Operational factors such as electrolyte flow, mass transfer rates and volumetric electrode area are highlighted as important factors in achieving high efficiency; minimisation of internal bypass currents is critical. Developments have enabled improvements in reactor construction and a wider choice of electrode material. Future R & D needs are highlighted.

show abstract

Anodic oxidation of cyanide on a reticulated three-dimensional electrode

Tissot

Fragniere

1994

J Appl Electrochem

View full text Add to dashboard Cite

Application of the trickle tower to problems of pollution control. III. Heavy-metal cyanide solutions

Cited by 22 publications

References 3 publications

Copper Electrodeposition and Oxidation of Complex Cyanide from Wastewater in an Electrochemical Reactor with a Ti/Pt Anode

Copper Electrodeposition and Oxidation of Complex Cyanide from Wastewater in an Electrochemical Reactor with a Ti/Pt Anode

Editors’ Choice—Critical Review—The Bipolar Trickle Tower Reactor: Concept, Development and Applications

Anodic oxidation of cyanide on a reticulated three-dimensional electrode

Contact Info

Product

Resources

About