Anaerobic digestion produces biogas which usually contains 60-70% of methane (CH4). 30-40% of carbon-di-oxide (CO2). and 10-2. 000 ppm hydrogen sulfide (H2S). https://www.roneverhart.com/Necco-Mighty-Malts-Speckled-Malted-Milk-Eggs-Wrapped-9-Ounce-Bag/