Developing and testing electrochemical methods for treating metal salts, cyanides and organic compounds in waste streams

Dziewinski, J.; Marczak, S.; Nuttall, Eric; Purdy, Geraldine M; Smith, Wayne H.; Taylor, J.D.; Zhou, Chengdong

doi:10.1016/s0956-053x(98)00029-4

Cited by 15 publications

(8 citation statements)

References 10 publications

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“…Moreover, they are highly selective. Electrochemical methods can be used for the neutralization of cyanides [8,9], phenols [10,11], chlorophenols [12][13][14], trichloroethylene [15], herbicides [16], poorly-degradable organic compounds [17], landfill leachate [18], and others. Electrochemical wastewater treatment can also be successfully applied in tanneries [19][20][21], olive-oil production plants [22], textile industry [23][24][25][26][27], and in distilleries [28].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical treatment of aqueous solutions containing urea

et al. 2009

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Investigations on the anodic decomposition of urea using Ti/Pt and Ti/(RuO 2 -TiO 2 ) 40:60 electrodes were carried out. The kinetics of the process were examined in a periodic electrolyser. The effect of anodic current density, initial urea concentration, and sodium chloride concentration on the effectiveness of the basic process (average rate of urea decomposition, current efficiency, and unit power consumption) is discussed. When a Ti/Pt electrode is applied for urea removal from aqueous solution urea is not decomposed directly at the surface of the electrode, but rather in the bulk of the solution by hypochlorite formed during the process. When the Ti/(RuO 2 -TiO 2 ) 40:60 electrode is used for the removal of urea from aqueous solutions, the reaction of urea with chlorine adsorbed at the electrode predominates. In both cases non-toxic products of urea decomposition (N 2 , CO 2 ,) are formed. Comparison of the effectiveness of anodic decomposition of urea for the Ti/Pt and Ti/(RuO 2 -TiO 2 ) 40:60 electrodes in the periodic electrolyser at optimum process parameters has revealed that the former electrode is more favorable.

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Section: Introductionmentioning

confidence: 99%

Electrochemical treatment of aqueous solutions containing urea

et al. 2009

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“…Systems with soluble anodes were also studied. These systems used divalent iron to reduce the chromates [10][11][12][13]. However, the anode was steadily consumed and additional iron ions loaded the effluent.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical reduction of dilute chromate solutions on carbon felt electrodes

Frenzel¹,

Holdik²,

Barmashenko³

et al. 2005

J Appl Electrochem

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Carbon felt is a potential material for electrochemical reduction of chromates. Very dilute solutions may be efficiently treated due to its large specific surface area and high porosity. In this work, the up-scaling of this technology is investigated using a new type of separated cell and once-through flow of industrial rinse water. A significant enhancement of the process is obtained due to copper deposition during long-term operation. The co-deposition and re-solution of copper occurs depending on the inlet chromate concentration. When previously deposited copper is present a current-free reduction of chromate takes place resulting in current efficiencies apparently above 100%. Very high space time yields are obtained even for effluents at low concentration and optimised conditions (high flow rates and pH 2). The economic feasibility of the technology is also considered. Continuous, single-pass operation results in lower energy requirements than batch processing. The economic potential of the process is also evaluated in comparison with chemical detoxification of chromate. The operating costs for the electrochemical treatment of very dilute effluents on a carbon felt electrode are 30% lower than for the chemical method.

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“…Various biological treatment methods have been used to remove the biodegradable organics in the wastewater, such as: aerated lagoon, trickle bed filter, and rotating biological contactor, etc 3. The dissolved organics in industrial wastewaters can also be treated by anodic oxidation using an electrochemical cell 4–6. Metal ions in the wastewater can be treated by electrical treatment methods in addition to the conventional method of chemical precipitation.…”

Section: Introductionmentioning

confidence: 99%

Treatment of wastewater using a combined biological and electrochemical technique

Doan

Boithi

et al. 2003

J of Chemical Tech & Biotech

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Simulated wastewater containing propylene glycol methyl ether, Ni 2+ and Zn 2+ was treated using an aerated packed column. An electrochemical cell was also installed beneath the packing support in the bottom section of the column. The flowrate of water through the column was maintained at 8.94 kg m −2 s −1 . For 72 h of treatment using aeration alone, the BOD 5 was reduced by 43%, 56%, and 54% for air flowrates of 0.00094, 0.00141, and 0.00188 kg m −2 s −1 respectively. On the other hand, when the electrochemical cell was activated without aeration, the BOD 5 was reduced by 15%, 17%, and 23% at the applied voltages of 8, 16, and 25 V respectively. When both aeration of the wastewater and a voltage of 25 V were used, the percentage removal of BOD 5 , on the average, was about 65% for all air flowrates used.

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Developing and testing electrochemical methods for treating metal salts, cyanides and organic compounds in waste streams

Cited by 15 publications

References 10 publications

Electrochemical treatment of aqueous solutions containing urea

Electrochemical treatment of aqueous solutions containing urea

Electrochemical reduction of dilute chromate solutions on carbon felt electrodes

Treatment of wastewater using a combined biological and electrochemical technique

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