TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The heavy metal compounds are removed from the landfill gas by reaction with a cobalt or nickel containing catalyst, which may be followed by an absorbent material comprising zinc oxide composition. Preferred Components: The conversion catalyst is a supported group 8 transition metal catalyst. The catalyst comprises nickel or a combination of nickel and a precious metal catalyst, supported on a refractory support.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The pre-treatment unit having compression means, heat exchange means and separation means that pressurize the landfill gas and cool it so that water present in the landfill gas is condensed and separated upstream of the purification unit. The purification unit comprises a cryogenic capture unit having compression means, heat exchange means and separation means that pressurize the landfill gas and cool it so that volatile organic contaminants and carbon dioxide present in the landfill gas are condensed and separated. The apparatus comprises: an oxygen removal unit, downstream of the purification unit, the oxygen removal unit comprises a reactor containing a supported group 8 conversion catalyst able to react hydrogen and/or carbon monoxide present in the landfill gas with oxygen; a heavy metals removal unit, downstream of the purification unit, the heavy metals removal unit comprising a reactor containing a cobalt or nickel containing catalyst, which may be followed by an absorbent material comprising zinc oxide composition. The hydrogen generation unit comprises a steam reformer having many externally heated catalyst-filled tubes through which a mixture of steam and the mixed gas stream may be passed. In the apparatus at least one water-gas shift converters containing a water-gas shift catalyst are operatively coupled downstream of the steam reformer unit. The condensing means comprising at least one heat exchanger and separator are coupled to the hydrogen generation unit to cool the hydrogen-containing gas and separate the condensate. The mixing unit is installed upstream or downstream of the condensing means.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The landfill gas is subjected to a pre-treatment step in which the water content of the landfill gas is reduced by cooling the landfill gas to condense water and removing the condensate in at least one separator, thus forming a de-watered landfill gas. The pre-treatment comprises increasing the pressure of the landfill gas to a pressure of 0.5-5 bar and cooling with cooled water below 40 degrees C and optionally, chilled water below 10 degrees C. The volatile organic contaminants are removed by cryogenic capture using at least one refrigeration unit operating under conditions that cause volatile organic contaminants to condense, followed by removal of the condensed contaminants. The cryogenic capture of volatile organic contaminants is performed on the landfill gas compressed to a pressure of greater than or equal to 10 bar and cooled to -20 to -50 degrees C, preferably -20 to -30 degrees C. The carbon dioxide content of the landfill gas is reduced by cryogenic capture using at least one refrigeration unit operating under conditions that cause carbon dioxide to condense, followed by removal of the condensed carbon dioxide. The cryogenic capture of carbon dioxide is performed on the landfill gas compressed to a pressure of greater than or equal to 10 bar, preferably greater than or equal to 15 bar, and cooled to less than or equal to -50 degrees C, preferably less than or equal to -80 degrees C. The both volatile organic contaminants are removed and the content of carbon dioxide in the landfill gas is reduced by cryogenic capture using at least one refrigeration unit operating under conditions that cause volatile organic contaminants and carbon dioxide to condense, followed by removal of the condensed contaminants and condensed carbon dioxide. The condensed carbon dioxide is used to cool the landfill gas following removal of the volatile organic contaminants and where the purified mixed gas stream obtained after separation of the condensed carbon dioxide is used to cool the landfill gas prior to the step of condensing volatile organic contaminants. The oxygen is removed from the landfill gas using a conversion catalyst to react free oxygen present in the landfill gas with hydrogen and/or carbon monoxide also present in the landfill gas. The process operated following a step of: cryogenic capture of volatile organic contaminants and carbon dioxide; and a step of oxygen removal. The first portion of landfill gas that is subjected to reforming in order to generate hydrogen is 45-55% of purified mixed gas stream. The hydrogen formation step is achieved by reforming or by a combination of reforming and water-gas shift steps, in which the reforming step comprises at least one stage of catalytic steam reforming, a combination of catalytic steam reforming an partial oxidation or just partial oxidation. The hydrogen generation step comprises steam reforming in a heat exchange reformer. The steam reforming is achieved by passing a mixture of steam and the purified mixed gas stream comprising methane and carbon dioxide through many externally-heated catalyst-filled tubes. The tubes of the reformer are externally heated by combusting a portion of the purified mixed gas stream. The reformed gas stream is subjected to at least one water-gas shift stages over an iron- or copper-containing catalyst. In the process, any steam or water in the hydrogen-containing gas is removed before or after mixing the hydrogen-containing gas with the second portion of the mixed gas stream that has by-passed the reforming step. The hydrogen-containing gas is cooled in at least one stage to below the dew point and condensed water removed using at least one separator. In the process, a portion of the hydrogen-containing reformed gas mixture is used to provide hydrogen for the oxygen removal stage. The combined hydrogen-containing gas and mixed gas stream are subjected to at least one subsequent drying steps and an odorizing step. EXAMPLE - No suitable example given.