A new wastewater treatment process was tested in a small city in China. It uses a combination of submerged biofilm and activated sludge to clean the water. The process worked well, removing a high percentage of pollutants like carbon, nitrogen, and phosphorus. The treated water had very low levels of contaminants, making it safe for reuse in things like flushing toilets and watering plants. The system also helped remove phosphorus by recycling some of the sludge. Overall, this method is cost-effective, produces less sludge, and is great for small towns and cities.