A process and system for oil-contaminated soil remediation and oil recovery from oil-bearing media such as oil-contaminated soil, different types of oil-bearing sludge's from oil producers, upgraders and refineries, oil shale, oil sands, and coal oil shale, oil sands and coal includes (1) a portable or fixed twin thermal desorption unit with two rotating trundles in one stationary house, and (2) multiple co-combustion burners burning coal, scrap tires, used oils, sludge's containing high oil content, propane and natural gas to supply heat for the twin desorption unit, and (3) a suction fan to create a slightly vacuum environment, receive vapors and send them to (4) a cooling line with a heavy component condenser to condense heavy oils, a set of air cooling pipe to condense light oils and steam and a three-phase (gas/oil/water) separation tank to separate oil from water, and (5) a feeding line with a blender to break wet lumps and a crasher to break rocks presence in the raw material being processed.