Our Biogas Plants

The first step in the Anaerobic Digestion (AD) process is when biomass is put inside a digester. It is the same process that occurs in the stomach of a cow. A similar process is exploited in a digester, where organic material such as crops or food waste is put into an air-tight digestion container. This procedure can be divided into three main steps: hydrolysis, fermentation and methane formation. First, micro organisms decompose complex organic compounds to simpler compounds such as sugar and amino acids. In a second step, a number of intermediate products are formed, including alcohols, fatty acids and hydrogen gas. Finally, methane is formed by a unique group of micro organisms and produces the raw biogas that mainly consists of methane and carbon dioxide.

In order to use biogas as a substitute for fossil fuel, its energy content must first be increased by removing carbon dioxide, a process known as gas up-gradation. In an up-gradation plant water and contaminants must be removed.

Green Elephant operates with large-scale as well mid-scale biogas plants (GreenBox™). We us pumps to load the raw materials. To store the gas and protect it against weather we use digesters with up to four stirring devices and double membrane roofs.

AD is not a new technology, it has been already used since the late 1800s. Nonetheless, now an increasing number of AD plants are being built worldwide to generate clean renewable energy. Mid-scale biogas plants, such as the GreenBox™, are also used to treat the waste produced in homes, farms and supermarkets. This helps divert waste from landfill.