Question

How can sewage be used to generate biogas? Explain.

Answer 1

Biogas can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste. Biogas is a renewable energy source. It can also be used in a gas engine to convert the energy in the gas into electricity and heat. Stages in biogas production Biogas is produced using well-established technology in a process involving several stages: Biowaste is crushed into smaller pieces and slurrified to prepare it for the anaerobic digestion process. Slurrifying means adding liquid to the biowaste to make it easier to process. Microbes need warm conditions, so the biowaste is heated to around 37 °C. The actual biogas production takes place through anaerobic digestion in large tanks for about three weeks. In the final stage, the gas is purified (upgraded) by removing impurities and carbon dioxide. After this, the biogas is ready for use by enterprises and consumers, for example in a liquefied form or following injection into the gas pipeline network.