알루미늄 부식을 적용한 활성슬러지법에서 질소 및 인 제거

Removal of Nitrogen and phosphorus by Activated Sludge Process Combined with Aluminum Corrosion

A laboratory experiment was performed to investigate simultaneous removal of phosphorus and nitrogen from raw sewage by intermittently aerated activated sludge process packed with aluminum and silver plate. Two continuous experimental process, i.e. an intermittently aerated activated sludge process, and an intermittently aerated activated sludge process with an aluminum and silver plate packed into the reactor were compared. The pitting corrosion of aluminum does not affect the performance of the biological treatment. The amounts of Al eluted from aluminum plate 17 mg to 60.6 mg in this experimental conditions, and Al/P mole ratio were from 3.31 to 11.25. The total nitrogen removal efficiency in Run E were 60.6% at the HRT of 12 hours. The effluent PO4-P concentration as low as 1.0 mg/l could have been obtained during the continuous experiment in Run E at HRT of 12 hours.