Abstract: According to the invention the heating system for regenerative coke oven batteries that can be heated with rich gas and/or lean gas or mixed gas is provided comprising vertical flues cooperating in pairs, each vertical flue being connected to a regenerator for preheating the air and, in the case of lean gas operation, for preheating the lean gas or mixed gas. High and low combustion stages, as well as structure defining an internal flue gas return at levels above a flue base are provided. Discharge openings are provided at at least three levels for supplying each flue. A base discharge opening is provided at the flue base directly connected to regenerators. Hollow communicating channels are defined for connecting the regenerators to discharge openings located above the flue base. The hollow communicating channels are preferably formed in each communicating wall connected to a discharge opening leading only to one adjacent flue.

Abstract: The invention comprises a process for treating contaminated earth with different organic and inorganic substances, such as for example benzene, toluene, naphthalene, phenols and other mono- and polycyclic or aliphatic oxygen-, nitrogen- and sulphur-containing hydrocarbon compounds as well as simple and complex inorganic or organic salts. The invention concerns a combination of the following processing stages: (a) homogenization and comminution of the contaminated earth with an addition of treated recycled water to obtain a pumpable suspension; (b) treatment of the suspension in a single- or multi-stage extraction process in counter-current with warm or hot recycled water according to the principle of increased dissolving power at high temperatures (over 100.degree. C.