Author : Ramakrishnaiah C. R, Sukruti Duvvuri [ Volume No.:VI, Issue No.IV-July 2017] [Page No : 730-733] [2017]

Hazardous waste generating industries, which contain unsafe levels of organic and inorganic contaminants, should follow some routes to manage the waste. However, in most Asian countries like India, this management is relatively a very new concept. A major task to manage hazardous waste is to stop the leaching of the disposed wasted from polluting the underlying ground water. An attempt has been made to treat/stabilize hazardous wastes prior to disposal into a landfill using a specially prepared sinter “S” along with the conventional material like Fly ash, Cement & Lime. The experiments were carried out with 15 mixtures of cement, fly ash, sinter, and lime; each of these mixtures was blended with water. Characteristics of the stabilized/solidified product, including compressive strength and metal concentration in the leachate, were evaluated. The compressive strength of 6.9 N/mm2 was attainable for solidification when the additives are added to the sludge and cured at 23°C for 28 days. The best mixes showed exceptionally high values of compressive strengths indicating the enormous success of the use of sinter for solidification. The optimal mixtures are effective in solidifying electroplating sludge (ETP sludge) and in reducing leachability to the required limits. The sinter obtained by a special process from ETP sludge and Water works sludge is found to replace cement to an extent of 45% in the Solidification/Stabilization process.