NOVELTY - Gas collection and separation unit comprises intake opening connected to first tank, first tank containing water and having emission opening for release of methane, sparger located within first tank, passageway connected to first tank and heat exchanger, conduit for water-soluble gases attached to heat exchanger, opening connected to conduit for introduction of acidic solution into water-soluble gases, pressure release valve attached to an end of the conduit and compressor for compressing carbon dioxide and having opening for emitting carbon dioxide.    USE - The gas collection and separation unit is useful for producing methane by digesting organic material (claimed) chosen from human and animal waste, coal-fired plants, outdoor sewage lagoons, biogas and hot smoke stack gas sources.    ADVANTAGE - The gaseous by-products collected can be reused without emitting into air as waste. The production of methane can be increased.    DETAILED DESCRIPTION - Gas collection and separation unit comprises (a) intake opening connected to first tank, first tank containing water and having emission opening for release of methane, sparger located within the first tank, passageway connected to the first tank for circulation of water-soluble gases and heat exchanger, conduit for water-soluble gases attached to heat exchanger, opening connected to the conduit for introduction of acidic solution into the water-soluble gases, pressure release valve attached to an end of the conduit for release of the acidic solution and the water-soluble gases into second tank (where the second tank includes condenser), and compressor for compressing carbon dioxide and having opening for emitting carbon dioxide, or (b) heat exchanger (where gas enters receptacle near the heat exchanger) connected to sparger that connects to first separation tank, first separation tank comprising valve and discharge pipe, where the valve is configured to release methane collected within the first separation tank and the discharge pipe is configured to release water-soluble gases after saturation and connected to the heat exchanger, connector pipe connecting the heat exchanger to second separation tank (where the water-soluble gases of the discharge pipe are combined with acidic solution and passed through pressure release valve to enter the second separation tank as a mist), cooling coils connected to the bottom of the second separation tank having an input and output opening and compressor connected to the top of the second separation tank, where carbon dioxide collected in the second separation tank moves through the compressor to collection opening. INDEPENDENT CLAIMS are included for the following:    (1) method (M1) for collecting and separating gases of different densities, involves receiving gaseous emissions in opening connected to heat exchanger, combining the gaseous emission with alkaline water, filtering the gaseous emissions through a sparger, collecting the gaseous emission in first separation tank, capturing methane separated from the gaseous emissions, diverting water-soluble gases used in the first separation tank to the heat exchanger, combining the water-soluble gases with an acidic solution, releasing the water-soluble gases and acidic solution as a mist into second separation tank, collecting water droplets from the second separation tank in cooling coils, and capturing carbon dioxide separated in the second separation tank and collected in compressor;    (2) method for producing of methane, involves inoculating organic waste with large numbers of selected bacteria, optimizing fermentation conditions to maximize methane production and implementing phage monitoring system and mutant-derivation program to ensure optimal microbial conditions in organic matter degeneration; and    (3) method for digestion of organic material, involves (a) determining phage patterns and phage host ranges of methane producers in rumen, isolating species of bacteria contributing to cellulose breakdown and methane production in bovines, culturing isolated species of bacteria and assessing phage resistance of isolated species of bacteria, or (b) inoculating digester containing organic material with an inoculum having several different genera of phage-resistant bacteria, adding second inoculum of phage-resistant bacteria to the digester to produce one or more of carbon dioxide, hydrogen and organic acids, adding third inoculum of phage-resistant bacteria to the digester to convert one or more of carbon dioxide, hydrogen, and organic acids to methane, optimizing fermentation by controlling one or more of temperature, pH and moisture content, monitoring nutrients and adding nutrients as needed to optimize fermentation.