Anaerobic Digestion (AD) with slurry covers is a process where organic waste, such as food scraps or animal manure, is broken down by microorganisms in an oxygen-free environment. This happens under a special cover placed over a slurry (a semi-liquid mixture, often of manure and water). As the waste decomposes, it releases biogas, a type of renewable energy. This biogas, primarily methane, can be captured and used to generate electricity or heat. The process also produces digestate, a nutrient-rich substance that can be used as a fertiliser.

Anaerobic Digestion (AD) in digester tanks is a process where microorganisms break down organic waste, such as food scraps and animal manure, without oxygen. This happens inside a sealed tank called a digester. As the waste is digested, it produces biogas, a mix of mainly methane and carbon dioxide, which can be used to generate electricity, heat or cool. The remaining material, known as digestate, is rich in nutrients and can be used as fertiliser.

Pyrolysis is a method of turning waste into energy by heating it to very high temperatures in the absence of oxygen. This lack of oxygen is key because it prevents the waste from burning. Instead, the waste breaks down into different products, including a type of gas that can be used to generate electricity, a liquid that can be converted into fuel and a solid residue rich in carbon, called char. This process can handle a variety of waste materials, including some that are difficult to recycle conventionally. It's a way to extract value from waste while reducing its volume significantly.