A AnoxKaldnes BAS™ The BAS™ biological wastewater treatment process is the optimally designed combination of MBBR and activated sludge processes and is a leading edge process used for treatment of industrial and municipal wastewater. Aerobic Wastewater Treatment AnoxKaldnes™ LagoonGuard™ Aerated lagoons are used extensively for the treatment of both municipal and industrial wastewater. Aerobic Wastewater Treatment AnoxKaldnes™ MBBR Combining microbiological expertise with decades of experience in wastewater processes enables us to improve on existing systems and to develop new processes. Aerobic Wastewater Treatment