Outline Chapter 15 Biological Treatment of Wastewater 1. Microbial-based treatment systems for the destruction of naturally occurring organic compounds have several advantages over chemical or physical technologies. No need for replacement once loaded 2. Domestic Wastewater Treatment. Primary treatment consists of screening and sedimentation of the influent to remove large insoluble materials.
Secondary treatment includes a bioreactor that is usually followed by clarification.
The effluent may be disinfected to remove pathogenic bacteria and viruses and discharged or subjected to tertiary treatment by chemical precipitation to remove phosphate and nitrate. The vast majority of biological treatment processes utilize aerobic bioreactors. Aerobic processes are up to ten times faster than anaerobic processes, however up to four times as much biomass is produced aerobically . The sludge produced from aerobic processes is frequently treated anaerobically to reduce its BOD prior to disposal in a landfill. Types of Aerobic Reactors.