Two companies have bought motor oil recycling firm Thermo Fluids Inc. Wastewater and water company Heckmann Corp. of Coraopolis, Pa., partnered with the Chicago-based private equity firm CIVC Partners to buy Thermo Fluids (TFI) for $245 million in cash and Heckmann common stock, according to a news release. TFI is an environmental services and waste recycling solutions company focused primarily on the collection and recycling of used motor oil.