A study on the removal of heavy metals by carbonatation cake discarded in sugar industry

Abstract

The removal of chromium (III) and cadmium ions by precipitation from synthetic wastewater samples by using I.carbonatation cake discarded in sugar production was investigated. The dried carbonatation cake (DCC) containing 75-80 % CaCO3 precipitates chromium (III) and cadmium by neutralising the acidity of solution. However, organic substances in the cake cause an increase in the chemical oxygen demand (COD) of the water in contact with the cake. It was observed that the calcined forms obtained by heating the carbonatation cake above 600°C precipitate the chromium and cadmium ions most effectively without increasing organic pollution of water treated. It was concluded that the calcined carbonatation cakes (CDCC) can be used in heavy metals removal instead of calcium carbonate and/or lime in water treatment.