Aerobic Degradation of Surfactant and Nitrification in a Membrane Bioreactor (MBR) with CO2 and O2 Gas Analysis
Membrane technology, such as reverse osmosis, micro- and ultrafiltration, has developed into one of the most used environmental technologies, not only for drinking water treatment but also for wastewater treatment. A membrane bioreactor (MBR) was used for aerobic degradation of synthetic wastewater containing non-ionic surfactant (APG 2000 UP). The substrate degradation rate rS was determined from the element balance with CO2 and O2 gas analysis. In addition, nitrite accumulation in the nitrification process was studied in the MBR. The influence of the ammonia concentration cNH3 and dissolved oxygen concentration c?O2 on nitrite accumulation was investigated. Under high cNH3 and low c?O2 conditions a nitrite accumulation degree up to 74 % was reached. The nitrification performance was described by a kinetic model. Studies on nitrification in an activated sludge reactor (ASR) with a conventional settler showed improved performance with the addition of organic carbon.