Europe Anaerobic Digestion Market By Product Type (Upflow Anaerobic Sludge Blanket (Uasb), Internal Circulation Reactor (Ic Reactor), Expanded Granular Sludge Bed Digestion (Egsb)), By Industry Vertical (Paper Industry, Food and Beverage Industry, Chemical Industry), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2021-2031