NOVELTY - Operating waste treatment system for treating feed (113) by bringing industrial feed into contact with molten metal in first vessel (101), where the vessel contains volume of molten metal involves ejecting jet of air from lance placed above the molten metal into the metal to react with the metal to form layer of molten slag-oxide (108); continuing to eject jet of air from the lance; pumping the feed from tubular conduit to cause contact between the feed and the layer; directing exhaust gases evolving from the molten metal and molten slag-oxide layer to second vessel (103), and treating.    USE - For operating waste treatment system for treating feed by bringing industrial feed into contact with molten metal in first vessel; and as device for operating a waste treatment system (claimed).    ADVANTAGE - The system is capable of generating a high yield of syngas by providing a high metal content in the slag layer and an effective heat transfer to the feed. The metal content in the slag layer is increased by providing suitable ejection unit for blowing air through the slag layer into the molten metal.    DETAILED DESCRIPTION - Operating a waste treatment system for treating a feed (113) by bringing the industrial feed into contact with a molten metal in a first vessel (101), where the first vessel contains a volume of the molten metal, involves ejecting at least one jet of air from a lance positioned above the molten metal into the molten metal to react with the molten metal to form a layer of molten slag-oxide (108); continuing to eject at least one jet of air from the lance and causing at least one jet of air to pass through from the molten slag-oxide layer into the molten metal; pumping the feed from a tubular conduit positioned above the molten slag-oxide layer to cause contact between the feed and the molten slag-oxide layer, where the feed is selected from coal, coal-liquid slurry, biomass, waste-derived material, crude oil, tar sands, and/or shale-derived material, where the molten metal bath material has composition containing 3.3-3.97 wt.% carbon, 1.5-1.95 wt.% silicon, 0.30-0.35 wt.% manganese, 0.05-0.1 wt.% chromium, 0.005-0.02 wt.% sulfur, 0.030-0.035 wt.% phosphorus, 0.005-0.1 wt.% aluminum, 0.015-0.05 wt.% titanium; and directing exhaust gases evolving from the molten metal and molten slag-oxide layer to a second vessel (103) to treat the exhaust gases to a pre-determined proximate gas molar composition; where a product syngas flowing from the molten metal is directed by at least one gas passage conduit configured in operational communication with the second vessel and with a powerplant for electric power generation, a first chemical catalytic reactor to chemically reform product syngas into a predetermined hydrocarbon product, a second chemical catalytic reactor to chemically reform product syngas into anhydrous ammonia product, and/or a third chemical catalytic reactor to chemically reform product syngas into methanol product. An INDEPENDENT CLAIM is included for device for operating a waste treatment system for treating a feed by contacting the feed into a molten metal in a first vessel, where the first vessel contains a volume of the molten metal, comprising ejection unit for ejecting at least one jet of air from a lance positioned above the molten metal into the molten metal to react with the molten metal to form a layer of molten slag-oxide and for continuing to eject the jet of air from the lance and causing the jet of air to pass through from the molten slag-oxide layer into the molten metal; a tubular conduit for connection to a feeder pump and for causing a contact between the feed and the molten slag-oxide layer, the tubular conduit is positioned above the vessel, at least one gas passage conduit formed in operational communication with the vessel, the gas passage conduits comprising a gas passage conduit for directing exhaust gases evolving from the molten metal and molten slag-oxide layer to a second vessel to treat the exhaust gases to a pre-determined proximate gas molar composition; and the gas passage conduits comprising a gas passage conduit for directing syngas from the first vessel to the second vessel and to a powerplant for electric power generation, a first chemical catalytic reactor to chemically reform product syngas into a pre-determined hydrocarbon product, a second chemical catalytic reactor to chemically reform product syngas into anhydrous ammonia product, and/or a third chemical catalytic reactor to chemically reform product syngas into methanol product.    DESCRIPTION OF DRAWING(S) - The figure shows a cross sectional view of the device for operating a waste treatment system.    First vessel (101)    Cover (102)    Second vessel (103)    Gas passage conduit (104)    Molten metal layer (107)    Molten slag-oxide layer (108)    Feed (113)