Global Biogas Upgrading Market By Type (Water Scrubber , PSA (pressure swing adsorption) , Physical Absorption , Chemical Absorption , Membrane Separation , and Cryogenic Separation), By Application (Municipal Sludge , Garbage , Food waste , Industrial Wastewater , Agricultural Farms , and Energy Crops Biogas Project), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029