Sankaranarayanan, M. and Murugan, K. and Basha, C.A. and Vijayavalli, R.
(1991)
Electrochemical removal of nickel from industrial effluents.
Bulletin of Electrochemistry, 7 (2).
pp. 75-77.
ISSN 0256-1654
Abstract
Electrochemical industries, like metal finishing and electroplating industries, contribute considerably to pollution load. The pollutants include heavy metals and various organic and inorganic compounds. The most toxic pollutants are cyanides, mercury, lead, chromium, nickel, zinc etc. Nickel a well known heavy metal pollutant, is present in plating effluent to the tune of 10ppm to 200ppm. Conventional method of treatment of nickel-containing effluents, is by addition of suitable chemical percipitants and percipitating it as hydroxide after neutralising the effluent. This method is not suitable since sludge disposal becomes a problem. Electrochemical methods of treatment of industrial effluents have gained much importance in recent years. Various electrochemical techniques as well as reactors such as flowing system, trickel tower, bipolar rotating electrode cell, diaphragm cell and packed bed cells have been tried for effluent treatment. This paper describes the result of investigations carried out on the nickel by electrodeposition using a double packed bed cell electrolyser of flow by configuration using a synthetic effluent containing 200ppm of nickel and sulphuric acid as supporting electrolyte. The electrolysis was carried out in a batch recirculation system. The flow rate was varried from 5 to 60 l/h of all the flow rates under study, 5 l/h is found to be optimum flow rate at a current efficiency of 84% and conversion efficiency of 97%. The results are discussed in detail.
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