The three general phases of treatment are primary, secondary, and tertiary. During primary treatment, a large percentage of the suspended solids and inorganic material is removed from the sewage. The focus of secondary treatment is reducing organic material by accelerating natural biological processes. Agriculture, including commercial livestock and poultry farming, is the source of drive album soundtrack
organic and inorganic pollutants in surface waters and groundwater. These contaminants include both sediment from erosion cropland and compounds of phosphorus and nitrogen that partly sed edit specific line in animal wastes and commercial fertilizers. Animal wastes are high in oxygen demanding material, nitrogen sec phosphorus, and they often harbor pathogenic organisms. Control may involve settling sfd for liquids, limited biological treatment in aerobic or anaerobic lagoons, and sed edit specific line
variety of other methods.