METHANOGENESIS

In many cities across China, people turn kitchen scraps into energy by feeding them to large anaerobic digesters. The amount of gas these machines produce, however, varies a lot from one plant to another. Scientists wanted to know why some digesters make more methane than others. They examined seve

The study looked at six different amine‑rich pollutants that often show up in sewage sludge. These chemicals have various types of nitrogen groups—primary, secondary, tertiary and even quaternary ammonium. Researchers found that the first reactions these pollutants undergo are mainly adding a hydrox