Treating wastewater represents the largest application of biotechnology in the world, yet there has been no effort to map the global activated sludge microbiome. Until now. Researchers have recently launched a highly coordinated effort to examine the biogeography of this sludge microbiome. https://newscenter.lbl.gov/2019/05/23/understanding-microbiomes-for-advanced-wastewater-treatment-and-reuse-systems/