The general treatment of the incoming wastewater is a living and breathing process. It's actually not unlike a highly amplified version of a wetland. A number of specific bacteria, protozoan, and other microlife view our wastewater pollutants in terms of food in a basic elemental form. The microlife 'eats' the food, it grows, and it reproduces more microlife.
In very broad terms, each day the operators must remove a portion of this aerobic biomass to balance the food to microlife ratio. This removed portion of the process is called the biosolids. The biosolids are then subjected to a natural phase called digestion where they become very old and stable. This stabilization process kills the pathogens and renders a very beneficial soil nutrient. We land apply these biosolids at an agronomic rate under the strict supervision of DWR.