Main end products of the main waste water impurities in the three main process ypes employed for waste water purification Process type Impurity Aerobic Anoxic Anaerobic Organic carbon CO2+biomass CO2+biomass CO2+CHa+biomass Nitrogen NO3+biomass N2+biomass biomass Phosphorous biomass biomass biomass Heavy metals biomass biomass biomass Process type Impurity Aerobic Anoxic Anaerobic Organic carbon CO2+biomass CO2 + biomass CO2+CH4+biomass Nitrogen NO3 - +biomass N2+biomass biomass Phosphorous biomass biomass biomass Heavy metals biomass biomass biomass Main end products of the main waste water impurities in the three main process ypes employed for waste water purification