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Electrochemical degradation of cyanide
2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Cyanides are widely used in many industrial processes and the wastewater created has to be handled in an appropriate way not to cause damage to the environment. Over the years many different methods for treating wastewater that contains cyanides have been developed. This work has focused on four cyanide degradation processes: • Chemical oxidation using sodium hypochlorite. • Chemical oxidation using hydrogen peroxide. • Chemical oxidation using a mix of sodium hypochlorite and hydrogen peroxide. • Electrochemical oxidation. The electrochemical method was given special attention, since it is quite new compared to the others and the customer, Casa da Moeda do Brasil (the Brazilian Mint), was also particularly interested in this method. The results showed that the different processes were all quite capable of oxidising the cyanides present in the effluent solution but still there were some important differences to be noted. • The sodium hypochlorite method was very fast and efficient, but as a side effect high salinity was produced. • It was difficult to achieve environmentally acceptable levels of cyanides with hydrogen peroxide as oxidant even though about three times the stochiometric amount was added. • A combination of sodium hypochlorite and hydrogen peroxide considerably decreased the consumption of chemicals compared to when using each chemical separately. • In the chemical oxidation processes the copper in solution was precipitated as copper hydroxide sludge while the copper in the electrochemical degradation method was recovered as solid copper metal. • The consumption of chemicals was at a minimum when using the electrochemical process and the final cyanide concentrations were satisfactory.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Cyanide, wastewater treatment, electrochemical methods
Keyword [sv]
URN: urn:nbn:se:ltu:diva-58766ISRN: LTU-EX--00/287--SELocal ID: f53c94be-11e8-4ec5-8916-bae85d97e615OAI: diva2:1032154
Subject / course
Student thesis, at least 30 credits
Educational program
Chemical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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