The present invention is a system for generating a mixture of steam and combustion gas in a direct contact rotating steam generator, using high solids content water and without waste liquid discharge. The invention includes a longitudinally pressurized rotatable drum, being mounted at a slope and having an energy injection section, a steam producing section, a water injection section and a discharge section. The discharge section is placed at an opposite end of the steam producing section and opposite the water injection section. There is an inlet in the combustion section of the rotatable drum, an outlet at an end of the rotatable drum, an injector for water at the highest point of the rotatable drum. There is also a discharge located at an end opposite said end of the rotatable drum. There are also pluralities of chains hanging within the rotatable drum.