NOVELTY - The process comprises passing a raw natural gas stream through a separation unit (18) such as a pressure swing adsorption (PSA) unit for forming a product stream having a higher concentration of methane than in the raw natural gas stream and a waste stream containing the non-methane contaminants including hydrogen sulfide, and passing the waste stream through a biofilter such as a biotrickling filter, which contains a film of bacteria on a support medium, where the bacteria is capable of degrading the hydrogen sulfide into sulfur and sulfate compounds removed from the waste stream.    USE - The process is useful for treating a raw natural gas stream such as a biogas stream taken from a landfill or controlled anaerobic digestion of organic waste (claimed).    ADVANTAGE - The process is capable of economically and energy efficiently treating the raw natural gas stream with quality.    DETAILED DESCRIPTION - The process comprises passing a raw natural gas stream through a separation unit (18) such as a pressure swing adsorption (PSA) unit for forming a product stream having a higher concentration of methane than in the raw natural gas stream and a waste stream containing the non-methane contaminants including hydrogen sulfide, passing the waste stream through a biofilter such as a biotrickling filter, which contains a film of bacteria on a support medium, where the bacteria is capable of degrading the hydrogen sulfide into sulfur and sulfate compounds removed from the waste stream to form a treated waste gas, and adding an oxygen-containing gas stream such as air and an enriched oxygen stream to the biofilter to maintain bacterial activity. The treated waste gas removed from the biofilter has a concentration of hydrogen sulfide less than the waste gas entering the biofilter. The raw natural gas stream contains non-methane contaminants including hydrogen sulfide. The separation unit includes an adsorbent selective for the non-methane contaminants, and forms a non-adsorbed product stream having a higher concentration of methane than in the raw natural gas stream and a lower pressure waste stream containing the non-methane contaminants. The raw natural gas stream is pressurized to 100 psig for entry into the PSA unit. The pressurized natural gas stream is cooled to condense water from the raw natural gas stream before entering into the PSA unit. The biofilter is present in a form of a tower having a top, a bottom and a medium to support the film of bacteria and to allow gas to pass through the film. The waste gas is passed from the bottom of the filter upwardly through the medium and passed out from the top of the tower as a treated waste gas. The top of the tower passes water down through the medium to wash and carry sulfur and sulfate compounds from the biofilter. The contaminants further include carbon dioxide and volatile organic compounds (VOCs). The waste stream contains carbon dioxide and VOCs. The oxygen-containing gas is added directly into the biofilter or into the waste gas stream or both. The water is periodically introduced into the biofilter to wash the biofilm to remove sulfur and sulfate compounds from the biofilter. The waste gas stream subsequent to treatment in the biofilter is passed in contact with a sulfur absorbent material to remove further hydrogen sulfide from the treated waste gas. The waste gas leaving the biofilter is flared to the atmosphere, is used as fuel, with or without blending with a higher heating value stream, is thermally oxidized to degrade the VOCs, and is treated with the sulfur absorbent to further remove hydrogen sulfide contaminants. The waste gas leaving the sulfur absorbent material is flared to the atmosphere, and is thermally oxidized to degrade VOCs. An INDEPENDENT CLAIM is included for an apparatus for treating a raw natural gas stream.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic of a process for removal of hydrogen sulfide from biogas.    Compressor (12)    Separation unit (18)    Biofilter treater (24)    Sulfur polisher (30)    Thermal oxidizer. (32)