June 5 (Reuters) - Singapore's Sembcorp Industries Ltd said on Monday that it had commenced a process for a possible divestment of its waste management business and its energy from waste plant. The company, however, added that there was no certainty that the transaction would materialise, even as preliminary discussions with selected parties had begun. (Reporting by Archishma Iyer in Bengaluru; Editing by Rashmi Aich)