Cleaning tar deposits by diluted air combustion

We study one-dimensional flows possessing a combustion wave when air is injected into the porous medium filled with high viscosity non aqueous phase liquids (VNAPL), medium viscosity oil, light oil and water. The polluting VNAPL is burnt and the water is vaporized, we describe combustion regimes in the form of a sequence of travelling waves and derive formulae for parameters in these waves. We show that there are combustion regimes in which VNAPL or oxygen is partially consumed in combustion as well as a regime in which both VNAPL and oxygen are consumed completely. Explicit conditions for each combustion regime are given.