Some treatment plants likewise incorporate tertiary treatment steps built to further reduce plant nutrients (nitrogen and phosphorus), suspended solids, or biological oxygen demand inside the wastewater. Chemically precipitated phosphorus and filtration create a tertiary sludge. Finally, the stream undergoes disinfection treatment to destroy pathogenic microorganisms. The rejuvenated water will then be released to your stream or river or could possibly be sprayed over large elements of land. Treatment strategies to municipal sewage sludge Primary, secondary, and tertiary sludges normally are combined, along with the resulting mixture, containing from 1 to 4% solids, is named "raw" sewage sludge. Because of their pathogen content as well as unstable, decomposable nature, raw sewage sludge is really a potential health insurance environmental hazard; however, several treatment processes now are widely-used to stabilize sewage sludge, decrease its pathogen content, and i...